Abstract: A package manufacturing method of the present invention is a method of manufacturing a package with a recessed cavity formed in at least one of first and second substrates formed of a glass material and includes a cavity forming step of forming the cavity by performing press molding on at least one molded substrate of the first and second substrates and a heat treatment step of heating the molded substrate formed with the cavity.

Abstract: A method of manufacturing a piezoelectric vibrator according to the invention includes the steps of: inserting a core portion of a conductive rivet member, which includes a planar base portion and the core portion extending in a direction vertical to the surface of a base portion, into a penetration hole of the base substrate and bringing the base portion of the rivet member into contact with a first surface of the base substrate; applying a paste-like glass frit on a second surface of the base substrate and moving a first squeegee which comes into contact with the second surface with an attack angle in one direction to thereby fill the glass frit in the penetration hole; and moving a second squeegee which comes into contact with the second surface with an attack angle in a direction opposite to the one direction to thereby fill the glass frit applied redundantly on the second surface in the penetration hole.

Abstract: A glass substrate polishing method for polishing a glass substrate using a polishing device is provided. The glass substrate polishing method is characterized in that the polishing device includes a surface plate that is rotationally driven around a first central axis, a plate that is rotatable around a second central axis eccentric from the first central axis and presses the glass substrate toward the surface plate, and a work holder that is formed on the plate and restricts movement of the glass substrate in a surface direction while holding the glass substrate in a state in which a central axis of the glass substrate is eccentric from the second central axis. The glass substrate is polished by rotating the surface plate while the glass substrate is rotatably held in the work holder in a state in which an abrasive is interposed between the glass substrate and the surface plate.

Abstract: An electronic timepiece includes a reception unit that receives satellite signals transmitted from positioning information satellites; a manual reception process unit that starts operation of the reception unit and executes a manual reception process when an external operating member is operated; an automatic reception process unit that automatically operates the reception unit and executes an automatic reception process when a predetermined condition is satisfied; a simple time adjustment process unit that executes such a process to receive a satellite signal from one positioning information satellite, acquire time information from the received satellite signal, and adjust an internal time; and a high precision time adjustment process unit that executes such a process to receive satellite signals from a plurality of positioning information satellites, acquire time and positioning information from the received satellite signals and determine the location, and adjust the internal time to the time acquired base

Abstract: Provided are a vacuum package and a method for manufacturing the vacuum package having excellent airtightness and capable of improving mounting strength, and a piezoelectric vibrator, an oscillator, an electronic device, and a radio-controlled timepiece. The package includes a base substrate and a lid substrate bonded to each other, a cavity formed between the base substrate and the lid substrate and configured to be capable of sealing a piezoelectric vibrating reed, and penetration electrodes penetrating through the base substrate in the thickness direction so as to make the inner side of the cavity and the outer side conductive. Portions of the base substrate and the lid substrate in the vicinity of the cavity form bonding regions in which the two substrates are bonded. A notch portion through which the bonding surface of the lid substrate is exposed as seen from the thickness direction of the base substrate is formed on the corner portions of the base substrate.

Abstract: A satellite signal reception device having a reception unit that captures a positioning information satellite and receives a satellite signal transmitted from the captured positioning information satellite; a data acquisition unit that can acquire time information and positioning information based on the satellite signal received by the reception unit; and a reception mode control unit that controls the reception mode of the reception unit to at least one of a time information reception mode and positioning information reception mode. The reception unit includes a correlation unit that determines a correlation between a code used for capturing the satellite signal and the received satellite signal. The data acquisition unit includes an operating unit that decodes the received data. The reception mode control unit includes a clock control unit that separately controls the operating clock of the correlation unit and the process clock of the operating unit according to the reception mode.

Abstract: Various embodiments for maintaining a reliable time clock on a mobile computing device are described. In one embodiment, a mobile computing device may optionally enable and disable acquisition of time data from multiple sources including a mobile network and a global positioning system (GPS) satellite. The mobile computing device may comprise a time clock to display local time information derived from stored time data and may prioritize the multiple sources for writing and overwriting the stored time data to converge to the most reliable time data available. Other embodiments are described and claimed.

Abstract: In a time correcting apparatus, a signal including time codes is sampled to generate a bit sequence of input TCO data. A prognostic TCO data generating unit 33 generates a bit sequence of prognostic TCO data based on a current time calculated by a time calculating circuit 17. An error number calculating unit 34 compares bits of the input TCO data with bits of the prognostic TCO data to count the number of discrepancy, thereby calculating the number of errors, and shifts bits of the prognostic TCO data to generate new TCO data and compares bits of the new TCO data with bits of the input TCO data to calculate the number of errors. A judging unit 35 judges if the number of errors is valid. When the number of errors is valid, a time correcting unit 36 calculates a time difference of the calculated current time based on the number of shifting bits, as much as which number of shifting bits the prognostic TCO data has been shifted to calculate such valid number of errors.

Abstract: An electronic device includes a timer which measures a current time, a display which displays information based on the time, a receiver which, by receiving and decoding a signal, including time information indicating a standard time, which is encoded by means of a predetermined communication system, acquires the time information, and a controller which, as well as instructing the receiver to acquire the time information, corrects a deviation of the measured time, based on the time information, and instructs the display to display information based on the corrected time. The controller gives an instruction in such a way that no time period occurs in which both the receiver's operation of acquiring the time information, and the display's operation of displaying the information based on the corrected time, are executed.

Abstract: An internet synchronization timepiece system includes a timepiece having a timepiece signal transceiver and a time-keeping synchronization hub. The time-keeping synchronization hub includes a hub casing connected to a computer, a time-keeping device received in the hub casing for periodically receiving the real-time time and the weather forecast information acquired through internet, and a synchronization transceiver received in the hub casing for transmitting synchronized time information and the weather forecast information in a wireless manner as time signal and weather forecast signal to the timepiece.

Abstract: A wireless communication system (20) includes a base station controller (22) that receives timing information from a data set (26) that is generated by a neural network (28). The data set (26) allows for generating timing information based upon previous time information received from a GPS (24) and in one example, is capable of covering a time interval of up to two weeks during which effective communication with the GPS may be interrupted. In one example, the data set is continuously updated so that the base station controller (24) continuously has up to two weeks of future time information available.

Abstract: An electronic timepiece includes a reception unit that receives satellite signals transmitted from positioning information satellites; a time information generating unit that generates an internal time; a manual reception process unit that starts operation of the reception unit and executes a manual reception process when an external operating member is operated; an automatic reception process unit that automatically operates the reception unit and executes an automatic reception process when a predetermined condition is satisfied; a simple time adjustment process unit that executes a simple time adjustment process to receive a satellite signal from one positioning information satellite by means of the reception unit, acquire time information from the received satellite signal, and adjust the internal time; and a high precision time adjustment process unit that executes a high precision time adjustment process to receive satellite signals from a plurality of positioning information satellites by means of the

Abstract: A stepping motor driving apparatus of an analog electronic clock, in which, when the rotation of a rotor is not detected after a pulse is supplied to a coil of a stepping motor, a first switching control section switches the pulse supplied to the coil to a pulse having a larger effective value, and when the rotation of the rotor is detected continuously for a predetermined period or a predetermined number of times, a second switching control section switches the pulse supplied to the coil to a pulse having a smaller effective value, wherein the apparatus further includes a third switching control section that switches a driving pulse to a pulse having a smaller effective value when the rotation of the rotor is not detected for two times continuously, even after the first switching section increases the effective value of the driving pulse for two times continuously.

Abstract: A piezoelectric vibrator includes a base substrate and a lid substrate which are bonded to each other with a cavity formed therebetween; a piezoelectric vibrating reed which has a pair of vibration arm portions extending in parallel and is mounted on the base substrate within the cavity; and a getter material of a metallic film that is formed on the base substrate or the lid substrate so as to be arranged within the cavity and improve a degree of vacuum within the cavity by being heated. A restriction portion, which is arranged in the cavity and restricts a scattering direction of the getter material evaporated by the heating to suppress a scattering amount scattering toward the vibration arm portion, is formed in the base substrate or the lid substrate.

Abstract: A satellite signal reception device has a reception unit that receives satellite signals transmitted from a positioning information satellite, a timekeeping unit that keeps time internally, a power supply unit that supplies power at least to the reception unit, a correlation process unit that is disposed in the reception unit and has a plurality of correlators for determining a correlation with the satellite signal when receiving satellite signals, and a correlation process count determination unit that determines how many correlators to use when the reception unit receives the satellite.

Abstract: Disclosed is a method for improving accuracy of time measurement and a position tracking apparatus using the same. A method for improving accuracy of time measurement includes receiving a radio communication signal and obtaining timing information in a received signal; tracking a code that detects inconsistent timing between the received signal and a tracking signal generated for the received signal; storing history information on the inconsistent timing between the received signal and the tracking signal for each bit of the received signal; and arithmetically averaging the history information and updating the timing information of the received signal with the arithmetically averaged value.

Abstract: Methods and systems for providing accurate time-keeping on battery-powered communication devices used in AMI systems, mesh networks, and multi-channel radio networks. One embodiment allows the use of low power (and low cost) crystals in battery-powered endpoints by periodically correcting the poor timing of these crystals using communications with a nearby, non-battery-powered device. Such communications allow the battery-powered devices to align their timing with that of their non-battery neighbors, among other things.

Abstract: The present invention provides apparatuses and methods for updating a target device from a clock device through a network. The clock device obtains a time value from a clock source and sends the time value to a target device. A node within the network determines a time delay, adjusts the time value in accordance with the time delay, and sends the adjusted time value to the target device. The node may determine a time delay from an internal timer or from a measurement message when adjusting the time value. The clock device may send a subsequent time update message to the target device if the target device does not acknowledge reception of a time update. The clock device may also send a time update message to a target device when a status change of daylight savings time occurs and obtain a subsequent time value from a clock source.

Abstract: A method for determining portions of a GPS satellite signal may use non-coherent integration to determine a repeated pattern such as a preamble. Once the repeated pattern is determined, portions of the GPS satellite signal that may be determined with partial correlation sums. Sensitivity to satellite signals may be increased by computing more partial correlation sums on portions of the GPS satellite signal. In one embodiment, time of day information may be determined from the GPS satellite signal with partial correlation sums.

Abstract: A signal composing circuit 12 receives a signal including a time code from a receiving circuit 10, and detects input waveform data of a unit time length, whose value at ach sampling point is given by a value expressed in plural bits. The input waveform data is accumulated. CPU 13 calculates a minimum position on a time axis, where the minimum value of the accumulated input waveform data is given and a maximum gradient position on the time axis, where a difference between values of the accumulated input waveform data at adjacent sampling points is maximum, and further calculates a leading position of a unit time length of the signal including the time code.

Abstract: A GPS enabled timepiece. A Global Positioning System (GPS) enabled timepiece in accordance with the present invention comprises a timepiece, the timepiece comprising a local oscillator, and a GPS receiver, coupled to the timepiece, the GPS receiver using the local oscillator to predict a time arrival of a GPS message from a GPS satellite, wherein the GPS receiver is powered on based on the predicted time.

Abstract: A time information-acquiring apparatus comprises a receiver receiving a standard time radio wave, an input waveform generator sampling a signal output from the receiver and to generating input waveform data with one or more unit time lengths, the input waveform data at each sampling point having a first value indicating a low level or a second value, the input waveform data within a first characteristic section having a predetermined value unique to codes forming a time code included in the standard time radio wave, an accumulator accumulating the value of the input waveform data during the first characteristic section, a calculator multiplying the accumulated value by characteristic values, and calculating correlation values between the input waveform data and the codes based on multiplied values.

Abstract: A time information-acquiring apparatus comprises an input waveform generator which generates an input waveform, a predicted waveform generator which generates plural phase-shifted predicted waveforms, a correlation calculator which calculates a positive correlation based on a first value of the input waveform and a first value of the predicted waveform or a second value of the input waveform and a second value of the predicted waveform, and calculates a negative correlation based on the first value of the input waveform and the second value of the predicted waveform or the second value of the input waveform and the first value of the predicted waveform, a comparator which compares the correlation values to detect an optimal value, and a controller which detects a head position of a second based on a predicted waveform related to the optimal value.

Abstract: A master generator that updates time data of remote devices comprises an acquisition module, a clock module, an encoding module, and a transmission module. The acquisition module acquires time data representing current time of day. The clock module receives and stores the time data from the acquisition module and periodically updates the time data. The encoding module encodes the time data from the clock module into time messages. The transmission module selectively superimposes the time messages onto a power signal.

Abstract: An electronic timepiece wherein, when the week number indicates an n-th cycle from a specific reference date as a cycle number, a date determination information setting unit sets the date determination information using a partial unit that is a different number in each date corresponding to the same week number in a plurality of consecutive cycle numbers, and the date determination unit acquires the date in each cycle number identified by the week number and time of week based on week number cycle information correlating week numbers, cycle numbers, and dates, and determines in which of these dates the partial unit matches the date determination information.

Abstract: A radio-controlled timepiece that receives a standard time signal containing a time code and adjusts the time based on the received standard time signal includes: a reception unit that receives the standard time signal; an analog/digital conversion unit that digitizes the received standard time signal based on a prescribed threshold value; a time counter that keeps time; a time code generator that generates a reference time code based on the time counted by the time counter; a duty evaluation unit that calculates the pulse duty cycle of the digital signal output from the A/D conversion unit, and determines if the received pulse duty cycle that is calculated matches the duty cycle of the reference time code generated by the time code generator; a level changing unit that changes the relative level of the threshold value to the reception signal if the duty evaluation unit determines that the received pulse duty cycle does not match the duty cycle of the reference time code; and a time code decoder that decodes

Abstract: A timepiece with an internal antenna, including: a case that is made from a conductive material; a movement that is housed in the case and has a plurality of motors that drive staffs disposed at a plurality of locations; a dial that is made from a nonconductive material; and a patch antenna that is disposed inside the case on the back side of the dial, receives radio signals transmitted from an external source, and includes a dielectric and an electrode formed in the dielectric; wherein the patch antenna is disposed separated at least a specific distance from the inside surface of the case, and the staffs are disposed between the case and the patch antenna.

Abstract: A before/after specific weekday determination device that determines if an evaluation date is before or after a specific date that is identified as an n-th (where n is an integer of 1 or more) specific weekday from the beginning or the end of a specific month. The before/after specific weekday determination device is utilized in a daylight saving time determination device, and in a timepiece.

Abstract: The time and/or date display of a clock radio is settable remotely and automatically by a radio frequency information signal. The time and/or date display is initially set in manufacturing of the clock radio simultaneously to a plurality of clock radio units, and the display may also be adjusted with an adjusting radio frequency signal broadcast to a plurality of clock radio units simultaneously.

Abstract: An electronic timepiece has a reception unit that executes a search process to search for satellite signals that can be captured from among satellite signals transmitted from a plurality of positioning information satellites, and from among the satellite signals captured by the search process receives a satellite signal with signal strength greater than or equal to a specific signal reception threshold value; an information acquisition unit that acquires specific information including at least time information based on a satellite signal received by the reception unit; and a display that displays acquired information. A threshold value changing unit lowers the signal reception threshold value according to a search count, which is the number of times the search process has been applied to the satellite signals of all positioning information satellites.

Abstract: A timepiece includes a time displaying device, and a wireless transmission arrangement, which includes a first Main Control Unit (MCU), a wireless dongle and a primary transceiver device. The first MCU includes a first Central Processing Unit (CPU) core and a first memory unit arranged to implement a File Allocation Table (FAT) for managing memory data stored in the first memory unit. The wireless dongle is electrically connected to a computer. The primary transceiver device is electrically connected with the first MCU and wirelessly communicated with the wireless dongle, wherein the memory data is allowed to be wirelessly transmitted to the wireless dongle through the primary transceiver device so that the memory data originally stored within the first memory unit is capable of being processed in the computer, and addition data originally stored within the computer can be wirelessly transferred and stored in the first memory unit.

Abstract: A system for distributing and information processing watch information contents D1 concerning a variety of clocks, the system comprising: an information distribution device 19 that distributes watch information contents D1 concerning a variety of clocks, the contents being created in advance, as data to an information user's hand held terminal device #i (i=1 to n); and a plurality of hand held terminal devices #i that acquires and processes watch information contents D1 distributed as data by this information distribution device 19, wherein a software watch based on the watch information contents D1 is displayed as a video image, and a time is clocked at the hand held terminal device #i. In this manner, a plurality of software watches with different designs can be configured, and time display of these software watches can be automatically corrected.

Abstract: An electronic device that receives a radio signal according to specific conditions and displays specific information, including a reception unit that receives the radio signal; an electrophoretic display unit that displays the specific information; a display drive unit that supplies a drive signal corresponding to content of the specific information to be displayed to the electrophoretic display unit; and a control unit that instructs the reception unit to receive the radio signal and instructs the display drive unit to supply the drive signal to the electrophoretic display unit, instructs the display drive unit to supply a drive signal for displaying an indication that the reception unit is receiving the radio signal to the electrophoretic display unit before instructing the reception unit to receive the radio signal, and controls the display drive unit to stop supplying the drive signal while the reception unit is receiving the radio signal.

Abstract: A time adjustment device has a satellite signal reception unit that receives satellite signals transmitted segmented into segments from a positioning information satellite; a time information acquisition unit that acquires time information from the satellite signal; a segment identifier acquisition unit that acquires a segment identifier for the segment containing the time information; a corresponding identifier calculation unit that calculates a corresponding segment identifier that corresponds to the segment identifier based on the time information; and a segment identifier evaluation unit that determines if the segment identifier is correct based on the segment identifier and the corresponding segment identifier.

Abstract: Devices and methods for determining a current location using a location detection element, determining a local time zone based on the current location using a memory unit, keeping time using a micro-electro-mechanical-system (MEMS) oscillator unit co-fabricated on a common substrate with the location detection element, and determining a local time based on the local time zone using a controller element. Optional embodiments comprise a MEMS oscillator unit that is fabricated underneath, next to, or on top of the location detection element. Additional embodiments comprise a GPS chip optionally assisted by a cell phone chipset or FM receiver to enhance location and time determination. Optional embodiments may additionally enter a power conservation mode after the current location has been determined, or may detect air travel to disable the location detection element and enable the location detection element upon detected landing.

Abstract: The antenna circuit 42 includes: an MI magnetic sensor having an electric property which changes in accordance with a magnetic field change; a radio-frequency signal generator S1 to apply a radio-frequency signal to the MI magnetic sensor Z1; an inverter 92 to invert the radio-frequency signal; an adder 94 to reduce the radio-frequency signal by adding the inverted signal with a received signal obtained by the MI magnetic sensor Z1; and detectors D1 and D2 to detect the received signal in which the radio-frequency signal has been reduced. Further, included are a resonant circuit 620 including a magnetic sensor circuit Z1 and a resonant element such as quartz to retrieve a magnetic field change of a resonant frequency from a detected magnetic field change; and a resistance R0. Further, the magnetic sensor circuit 610 includes a magnetoresistance element 612, a DC power source 611 and a resistance R1.

Abstract: A radio wave timepiece A and a quadrature detection device for executing a quadrature detecting method are disclosed including a receiving antenna 14 for receiving a carrier wave of a long wave standard radio wave on which time information is multiplexed, a quadrature detection circuit 18 for performing quadrature detection of the carrier wave in response to a reference clock CK1, commonly used for timekeeping by a time counter 8, to obtain an in-phase component I and a quadrature component Q of the carrier wave for obtaining an amplitude AN,m of the carrier wave, and a time correction means 22, 24, 26 for obtaining time information depending on the amplitude of the carrier wave from the quadrature detection circuit 18. The time counter 8 is responsive to time information delivered from the time correction means to correct current time.

Abstract: Two or more wirelessly networked devices for control or data acquisition functions for real-time application are provided with a error corrected synchronization and data collection process. A single start device transmits a start message, followed by each stop device acknowledging that start message. If one or more stop devices fails to acknowledge the initial start message, one or more start messages are transmitted including an elapsed time since the initial start message. Each stop device receives the initial start message and any subsequent start messages, using the elapsed time in the start message to synchronize a local timer. Upon stop event detection, each stop device records its local timer value and subsequently transmits that value to a collection device or console.

Abstract: A method for automatically updating system time of a mobile communication device is provided. The method computes a current time zone of a current position of the mobile communication device according to a longitude and a latitude of the current position determined by satellite signals. The method then updates system time of the mobile communication device according to the current time zone.

Abstract: With the object of providing an electronic device having good radio signal receiving characteristics with a metal outer case housing therewithin an antenna section without restrictions imposed with regard to material or design, an electronic device minimally having an antenna section 32, an information processing means 33 for processing information that is captured by the antenna section 32, and a metal outer case 31, which houses therewithin the antenna section 32 and the information processing means 33, wherein the metal outer case is configured so that the antenna section 32 can receive magnetic flux from outside via the metal outer case 31 and can resonate, the metal outer case 31 minimally comprising a metal case body member 45 and a metal caseback member 41, and wherein a joining and fixing portion 400 between the metal case body member 45 and the metal caseback member 41 is not provided at a location or in the vicinity of at least a location opposite the substantially center part of the antenna section

Abstract: A time adjustment device has a reception unit that receives a prescribed signal containing time information transmitted by a base station, a display time information adjustment unit that adjusts the time information displayed by a time information display unit based on the time information, a base station identification information acquisition unit that gets base station identification information contained in the prescribed signal, and a time adjustment execution determination unit that decides based on the base station identification information whether the display time information adjustment unit adjusts the displayed time information using the time information from the prescribed signal.

Abstract: An analog type electronic timepiece including a plurality of hands for displaying a time; a driving unit for electrically driving the hands; a receiver for receiving and demodulating a radio wave containing a time code signal; and a second synchronization determination unit for determining a second synchronous point of the time code signal demodulated by the receiver through identifying a driving noise mixed in the time code signal by action of the driving unit.

Abstract: Systems and methods for distributing accurate time information to geographically separated communications devices are disclosed. Additionally, the desired systems and methods may adjust local time signals to compensate for measured signal drifts relative to more accurate time signals. Moreover, a system may determine a best available time signal based on a weighted average of available time signals or select a best available time signal based on weighted characteristics of various time signals. A system may be further configured to transmit time information embedded in an overhead portion of a SONET frame, including transmission of a standard or common time.

Abstract: To make such that, in a case displaying the fact that a time code could not be normally received in an analog radio-controlled timepiece, by a simple constitution there is performed a display having no sense of discomfort for a user. In a case where there could not be normally received in a time code reception operation in the last time, a second hand is normally moved by 1 second. In a case where there failed in a reception, after the second hand was normally moved till a 55-second position, the second hand is stopped at the 55-second position till a second time instant becomes 59 seconds. When it became 59 seconds, by fast-forwarding the second hand till an exact second position, the fact that the time code could not be normally received is displayed by the display having no sense of discomfort for the user without using an exclusive display means, and the like.

Abstract: An electronic device includes a timer which measures a current time, a display which displays information based on the time, a receiver which, by receiving and decoding a signal, including time information indicating a standard time, which is encoded by means of a predetermined communication system, acquires the time information, and a controller which, as well as instructing the receiver to acquire the time information, corrects a deviation of the measured time, based on the time information, and instructs the display to display information based on the corrected time. The controller gives an instruction in such a way that no time period occurs in which both the receiver's operation of acquiring the time information, and the display's operation of displaying the information based on the corrected time, are executed.

Abstract: The present invention provides a mobile equipment for non stationary use. The mobile equipment includes a real time clock (RTC) integrated in the mobile equipment for generating a real time information, a system time generator integrated in the mobile equipment for generating a system time information by adding an offset to the real time information given by the RTC, a non-volatile memory for the permanent storage of data and an input means for inputting instructions for changing the system time information. The possible changes of the system time information generated by the system time generator may be limited to a preset time range and the possible reset value of the RTC may be limited according to the data stored in the non-volatile memory.

Abstract: A broadcast receiving system according to an embodiment of the invention, is equipped with a module for displaying an on-timer setting menu, and a control module for referring to an internal clock which is corrected with reference clock information obtained from the outside and performing power control in accordance with the contents, input from a user via an operation module, on the on-timer setting menu. The control module allows selection of either of utilization and non-utilization of the clock information in the on-timer setting menu. The control module corrects the internal clock using the clock information and allows the power-on time to be set if the clock information is received from the outside and the utilization of the clock information has been selected and to allow the time until power on to be set without correcting the internal clock if the non-utilization of the clock information has been selected.

Abstract: A time adjustment device has a reception unit that receives a prescribed signal containing time information transmitted by a base station, a display time information adjustment unit that adjusts the time information displayed by a time information display unit based on the time information, and a time information extraction signal supply unit that supplies only a time information extraction signal, and the time information is extracted from the prescribed signal using the time information extraction signal.

Abstract: A time adjustment device having a satellite signal reception unit that receives satellite signals containing satellite time information transmitted from a positioning information satellite; a time information generating unit that generates time information; and a time information adjustment unit that adjusts the time information based on the satellite time information received by the satellite signal reception unit. The satellite signal reception unit includes a positioning information satellite selection unit that selects the positioning information satellite from which the satellite time information is received; and the positioning information satellite selection unit selects a positioning information satellite based on variation in the transmission frequency of the satellite signal transmitted from the positioning information satellite.

Abstract: Provided is a method of performing time synchronization using a navigation device. The method includes: (a) performing time synchronization between a GPS satellite and a navigation device by receiving GPS signals by a navigation device from at least one GPS satellite; (b) establishing an interface between the navigation device and a time-using device; (c) setting conditions for transmitting time information to the navigation device; and (d) performing time synchronization between the navigation device and the time-using device by transmission of time information from the navigation device to the time-using device.