Abstract: A method and apparatus for handling ephemeris information for a NTN cell in a wireless communication system is provided. A wireless device may receive, from a network, an ephemeris information related to a Non-Terrestrial Networks (NTN) cell. The wireless device may determine whether the ephemeris information is valid or not, based on whether the measurement on the NTN cell is able to be performed during the service time of the NTN cell. Based on determining that the ephemeris information is not valid, the wireless device may transmit, to the network, (1) information informing that the ephemeris information is not valid and (2) information on time at which the measurement on the NTN cell is able to be performed.

Abstract: A method for a platform-based scheduling of a job flow is provided, which relates to the technology field of satellites. Specifically, the method includes: acquiring satellite remote sensing data according to transit time of a satellite and triggering a processing flow of the satellite remote sensing data; determining an execution order of the processing flow of the satellite remote sensing data according to a constraint relationship; and allocating processing resources to the processing flow in a hierarchical scheduling manner according to the execution order, and executing the processing flow with the processing resources. Due to a reasonable determination of the execution order of the processing flow of the satellite remote sensing data and a scheduling of the processing resources in the hierarchical scheduling manner, a reasonable allocation of the processing resources is realized. Thus, A timeliness of the processing of the satellite remote sensing data may be improved.

Abstract: A receiver is provided for use with a global navigation satellite system (GNSS) comprising multiple satellites. The receiver comprises a receiver clock and at least one antenna for receiving multiple signals over multiple respective channels, each channel being defined by a transmitting satellite and a receiving antenna at opposing ends of the channel. The receiver further comprises at least one correlator for calculating cross-correlation functions between (i) the signals received over the multiple channels and (ii) reference versions of the navigation signals provided by the receiver. The receiver is configured to use the calculated cross-correlation functions to perform a joint estimate of (i) a clock bias of the receiver clock relative to the time reference maintained by the GNSS, and (ii) a composite channel comprising the combined contribution of the multiple channels as a function of time-delay.

Abstract: Systems, methods, apparatuses, and computer program products for reporting of integrity-related information for positioning are provided.

Abstract: The present disclosure provides a positioning method and device, an electronic device, and a storage medium. The positioning method may include obtaining a precise positioning request sent by a service equipment. The precise positioning request may carry rough positioning location information of the service equipment. The positioning method may further include determining, based on the rough positioning location information of the service equipment, a reference positioning point corresponding to the service equipment, and obtaining precise positioning location information of the service equipment by correcting, based on positioning deviation information of the reference positioning point, the rough positioning location information of the service equipment. The positioning deviation information of the reference positioning point may be calculated based on precise positioning location information of the reference positioning point and rough positioning location information of the reference positioning point.

Abstract: A method for broadcasting a basic safety message (BSM) packet from a host vehicle includes storing at least one path history entry of the host vehicle. The method includes determining whether a global navigation satellite system (GNSS) position fix is available. The method includes performing a corrective action on the at least one path history entry in response to the GNSS position fix not being available. The method includes, in response to the GNSS position fix being available, calculating a path history entry to be stored among the at least one path history entry based on the GNSS position fix. The method includes generating and broadcasting the BSM packet based on the at least one path history entry.

Abstract: Techniques for incorporating blended Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) integrity monitoring information as a connected network database are described. Information relating to the integrity of known instances of GNSS disturbances can be stored and accessed by users. The information can include data regarding the integrity of GNSS/INS position solutions generated from vehicles a priori, such as the location, time, and any known causes of the GNSS disturbance. The database can be located on a vehicle and/or on a remote server that can be shared to other users with access to the database. In some embodiments, access can be restricted to certain users if the data stored is confidential.

Abstract: A circuit includes a programmable frequency divider which receives a high-speed clock, fin, as an input and which provides a modulated reference clock as an output; a Sigma-Delta modulator which receives a Frequency Control Word (FCW) and which is connected to the programmable frequency divider to receive the modulated reference clock as a sample clock and to control an average frequency of the modulated reference clock; and an integer-N Phase Lock Loop (PLL) which receives the modulated reference clock and outputs a clock output.

Abstract: A system and method for collecting data to obtain the data from a user, obtaining metadata for each word of the data from the user, and/or obtaining a searchable transcript of the data and a device to store the searchable transcript. The metadata may be date, time, name or location metadata and the data collection device may include a speech recognition engine to translate speech into searchable words. The speech recognition engine may provide a confidence level corresponding to the translation of the speech into searchable words, and the speech recognition engine may distinguish a first user and a second user in order to provide a first searchable transcript for the first user and a second searchable transcript for the second user. An ad transcript may be added to the searchable transcript, and the searchable transcript may be placed in a centralized community search database.

Abstract: The disclosure provides a GNSS receiver. The GNSS receiver a measurement engine that generates a set of doppler measurements and a set of pseudo ranges in response to an input signal. A clock frequency drift estimation (CFDE) block receives the set of doppler measurements, and generates an averaged delta doppler. A position estimation engine estimates a position and velocity of a user based on the set of doppler measurements, the set of pseudo ranges and the averaged delta doppler.

Abstract: A synchronization control device configured to synchronize media play between at least two remote devices is disclosed. The synchronization control device includes: an input for receiving data indicating a point in a play of media content on a first remote media play device; and a synchronization controller module configured to align the point of play of media content on a first remote media play device with a point of play of the media content at a second remote media play device; and delivering commands to the first remote media play device and the second remote media display device, wherein the commands control the first remote media play device and the second remote media play device to substantially synchronize the play of the media content in the first remote media play device and the second remote media play device.

Abstract: A communication system, includes a satellite receiver in operable communication with a central server, a cellular node configured to operate within a proximity of the satellite receiver, and at least one mobile communication device configured to communicate (i) with the cellular node, (ii) within the proximity of the satellite receiver, and (iii) using a transmission signal capable of causing interference to the satellite receiver. The satellite receiver is configured to detect a repeating portion of the transmission signal and determine a potential for interference from the at least one mobile communication device based on the detected repeating portion.

Abstract: Systems, apparatuses, methods, and software are described herein that provide enhanced satellite link-coupled communication nodes. In one example, a parent communication node includes a communication interface configured to communicate with a plurality of child communication nodes over corresponding satellite communication links. The parent communication node includes a resource manager configured to determine physical resources local to each of the plurality of child communication nodes, establish a pool of resources from among the physical resources, and responsive to a request for execution of an application, allocate resources from the pool of resources for execution of the application at one or more selected child communication nodes. The parent communication node can initiate execution of the application using the allocated resources at the one or more selected child communication nodes.

Abstract: A first network node, a second network node and methods therein, for handling baseband processing of signals communicated with wireless devices in a wireless network. The first network node communicates a first type of signals with a first wireless device and performs a first part of baseband processing of the first type of signals using a non-GPP implemented processor. The first network node also communicates the first type of signals with the second network node for a second part of baseband processing of the first type of signals using a GPP implemented processor. The first network node further communicates a second type of signals with a second wireless device and performs both of said first and second parts of baseband processing of the second type of signals using the non-GPP implemented processor.

Abstract: A phased array antenna system has at least one trough reflector, each trough reflector having at least one phased array located at a feed point of the reflector, and an array of elements located near to a point equal to one half of a center transmission wavelength. A method of decoding a receive signal includes propagating a transmit signal through a transmit and a receive path of a phased array to generate a coupled signal, digitizing the coupled signal, storing the digitized coupled signal, receiving a signal from a target, and using the digitized coupled signal to decode the signal from the target. A method of modeling the ionosphere includes transmitting measuring pulses from an incoherent scattering radar transmitter, receiving incoherent scatter from the transmitting, and analyzing the incoherent scatter to determine pulse and amplitude of the incoherent scatter to profile electron number density of the ionosphere.

Abstract: A position detection method to be executed by a computer, the position detection method includes transmitting, by a sensor terminal, a signal obtained by performing capture processing on a satellite signal from a satellite of a search target according to an order of the satellites of the search targets; calculating, by a calculation device, a position of the sensor terminal based on a signal transmitted by the sensor terminal; and determining a satellite having a highest discovery probability based on a specific estimation method for second and subsequent search targets, using an index which is reflected larger as the discovery probability of other satellites is higher or lower, in a case where the first satellite is captured when a first search target is determined.

Abstract: Provided are satellite tracking antenna system in a plurality of satellite environments and a satellite tracking method using the same, and more particularly, satellite tracking antenna system and method in a plurality of satellite environments, which may receive a satellite signal by stochastically estimating and tracking a target satellite using pre-stored information on satellite orbits, without information on satellite network identity (NID) for every received satellite signal.

Abstract: Embodiments of the disclosure provide systems and methods for a multi-protocol LPWAN gateway. In the first mode, a transceiver of the gateway device can communicate with wireless devices in a first LPWAN protocol and, in the second mode, the wireless transceiver can communicate with the one or more wireless devices in a second LPWAN protocol. The second LPWAN protocol can be different from the first LPWAN protocol. In response to selecting the first mode, the gateway device can cause the wireless transceiver to conduct communications with the wireless devices using the first LPWAN protocol. In response to selecting the second mode, the gateway device can cause the wireless transceiver to conduct communications with the wireless devices using the second LPWAN protocol.

Abstract: A device that is configured to track an asset is disclosed. In one aspect, the device includes a radio module that generates proximity data that indicates a distance between the computing device and the device. The device includes a processor that compares the distance between the computing device and the device to a distance threshold. The processor determines that the distance between the computing device and the device satisfies the distance threshold. The processor arms the device. The device includes a motion sensor that generates motion data. The processor compares the motion data to a motion threshold. The processor determines that the motion data satisfies the motion threshold. The processor activates an alarm state.

Abstract: Aspects of the present invention provide an approach for non-visually mapping an environment. In an embodiment, a set of images that is within the field of view of the user is captured from a video capture device worn by the user. Environmental text that is within the set of images is identified. An aural contextual indicator that corresponds to the environmental text is then generated. This aural contextual indicator indicates the informational nature of the environmental text. An aural map of the environment is created using a sequence of the generated aural contextual indicators. This aural map is delivered to the user via an aural output device worn by the user in response to a user request.

Abstract: A mobile transceiver having multiple subscriber identity module (SIM) cards and a method of selection is provided. In accordance with one embodiment, there is provided a method of operating a mobile transceiver, comprising: activate a cellular transceiver using a first subscriber identity module (SIM) card in the plurality of SIM cards; switch from the first SIM card to a second SIM card in the plurality of SIM cards in response to a determination that a wireless service for the first SIM card is not available.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as long-term evolution (LTE). The present disclosure provides a device and a method for calibrating a phased array antenna. A method for calibrating a phased array antenna according to various embodiments of the disclosure comprises the processes of: controlling a first radio frequency (RF) chain so as to transmit a first signal at a first phase, thereby determining the phase difference between the first phase and a reference phase; controlling the first RF chain so as to transmit a second signal at a second phase, thereby determining the phase condition of the phase difference; and calibrating the first RF chain on the basis of the phase difference and the phase condition. The reference phase may be the phase of a reference signal transmitted from a reference RF chain.

Abstract: Example techniques disclosed herein relate to location-based playlists. In an example implementation, a system receives, from a mobile device, first GPS data indicating that the mobile device is located at a first physical location, wherein an application on the mobile device is registered with a particular user account of the cloud service. The system determines that the first physical location represented in the first GPS data corresponds to a location of a first business associated with one or more first playback devices within the cloud service. The one or more first playback devices are playing back first audio tracks. As each first audio track is at least partially played back, the system adds the respective first audio track to a location-based playlist associated with the particular user account of the cloud service. The computing system causes the mobile device to display an indication of the location-based playlist.

Abstract: A device for transmitting synchronized timing including a receiver, a transmitter, one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs including instructions for receiving through the receiver a timing signal comprising first time information that is synchronized to a time standard, determining second time information based at least partially on the first time information, composing a message formatted in accordance with a global navigation satellite system (GNSS) standard, wherein the message comprises the second time information, and transmitting the message through the transmitter on a radio signal having a frequency in the frequency modulation (FM) radio frequency band.

Abstract: In one embodiment, a sensor unit receives a first GPS message from a GPS sensor, where the sensor unit is coupled between sensors and a perception and planning system of an autonomous driving vehicle (ADV). The sensor unit determines a type of the first GPS message by matching a predetermined field of the first GPS message with a list of predetermined data patterns. Each of the predetermined data patterns corresponds to one of the predetermined types of GPS messages and decodes a payload of the first GPS message using a decoding algorithm associated with the type of the first GPS message.

Abstract: A method in a network node (115) is disclosed. The method comprises determining (504) whether a wireless device (110) is configured with discontinuous reception on a first communication link. The method comprises comparing (508) a target quality for a second communication link with an interruption probability or rate due to operation of the first communication link, and selecting (512) a scheduling scheme based at least in part on the comparison of the target quality for the second communication link with the interruption probability or rate due to operation of the first communication link. The method comprises scheduling (516) one or more resources for the wireless device (110) according to the selected scheduling scheme.

Abstract: Various arrangements are presented for using an estimated timing advance for user equipment communications. A location of an instance of user equipment may be determined. A first estimated distance between the user equipment and a communication satellite may be determined using the determined location of the user equipment and an estimated satellite location. A second estimated distance between the communication satellite and a communication network gateway may be determined. An estimated timing offset using the calculated first estimated distance and the determined second estimated distance may be determined. An uplink data frame may be transmitted by the user equipment to the satellite such that a timing of transmission of the uplink data frame is based on the calculated estimated timing offset.

Abstract: The invention relates to a lighting device for providing a position identification signal, wherein the lighting device comprises a lighting means. A transmitting unit comprising an antenna element transmits the position identification signal in the form of a directed radio signal having a specifiable emission characteristic during intended operation, wherein the position identification signal comprises a position determination data regarding a position of the transmitting unit and/or of the lighting means. The invention further relates to a lighting system having a plurality of lighting devices. In addition, the invention relates to a method for operating a lighting device having a lighting means and a transmitting unit.

Abstract: A display system can be configured to receive, via a user interface, a first identifier associated with a first space object and determine a first maneuver of the first space object. The first maneuver can include a perturbation of the path of the first space object. Based on the first identifier and the first maneuver, the display system can identify one or more path parameters associated with a path of the first space object and generate a display interface. The display interface can include a longitude-time graph having a longitude axis spanning from a lower-longitude limit to an upper-longitude limit and a time axis spanning from the lower-time limit to the upper-time limit and an indication of the one or more path parameters.

Abstract: In a method of determining the position of an object, raw image data of the sky is recorded using a celestial imaging unit. The last known position, orientation, date, and time data of the object are obtained, and the position of a celestial body is measured. A latitude and longitude of the object is determined by matching the measured celestial body position to the expected celestial body position based on the input parameters. A system for determining a new position of an object comprises a celestial imaging unit configured to record image data of the sky, a signal processing unit, and a signal processing unit configured to receive and store in memory the image data received from the celestial imaging unit. The signal processing unit filters the image to find the positions of celestial objects in the sky. The signal processing unit is further configured to use roll and pitch from an IMU, and date and time from a clock to determine the object's position (latitude and longitude).

Abstract: Methods, systems, and devices for wireless communication are described. A transmitting device may identify a duration of a slot used for communications with a receiving device. The transmitting device may determine that the communications with the receiving device comprises frequency division duplexing (FDD) communications. The transmitting device may transmit communications to the receiving device during a first portion of the slot, a duration of the first portion being less than the duration of the slot and the duration of the first portion is based at least in part on the determination that the communications comprise FDD communications. The transmitting device may select, based at least in part on the determination that the communications comprise FDD communications and that the communications are transmitted during the first portion of the slot, a hybrid automatic repeat request (HARQ) scheme to use during the communications.

Abstract: Various arrangements are presented for using an estimated timing advance for user equipment communications. A location of an instance of user equipment may be determined. An estimated distance between the user equipment and a communication satellite may be determined using the determined location of the user equipment and an estimated satellite location. An estimated timing offset using the calculated estimated distance may be determined. An uplink data frame may be transmitted by the user equipment to the satellite such that a timing of transmission of the uplink data frame is based on the calculated estimated timing offset.

Abstract: First and second images provide varying levels of information associated with a given GPS location, first, when the mobile device is within the first pre-determined radius, r1, of a given GPS location and outside the second pre-determined radius, r2, of the given GPS location, and while the mobile device is in a screen locked state and, second, when the mobile device is within the first pre-determined radius, r1, of a given GPS location and inside the second pre-determined radius, r2, of the given GPS location.

Abstract: A method in which a user's location with respect to a border is received and if the user is likely to cross the border, a responsive action may be taken automatically and by machine logic. Further, items in the user's possession may be received along with a data set indicating that an item in a first entity is not permitted in a second entity. If it is determined that the user is likely to cross the border with the not permitted item, a notification may be sent to a device of the user that the item is not permitted in the second entity.

Abstract: A reception strength detection unit is connected to reception antennas located in a vehicle compartment and detects a reception strength of a radio wave from a mobile terminal for each of the reception antennas. A reception determination unit is connected to an auxiliary antenna located at a predetermined position that is a blind spot of the reception antenna and determines whether the radio waves has been received by the auxiliary antenna. When the radio wave has not been received by the auxiliary antenna, an existence position calculation unit calculates an existence position of the mobile terminal based on the reception strength detected by the multiple reception antennas. When the radio wave is received by the auxiliary antenna, the existence position determination unit determines the predetermined position at which the auxiliary antenna receiving the radio wave is located as the existence position of the mobile terminal.

Abstract: A method includes transmitting a digital code from a transmitter to a receiver. Information is transmitted via electromagnetic waves from the transmitter to the receiver. The transmission of the information includes transmitting a first portion of the information using electromagnetic waves with a first polarization in response to a first value of the digital code, and transmitting a second portion of the information using electromagnetic waves of a second polarization in response to a second value of the digital code. The first information may include a first navigational code and the second information may include a second navigational code.

Abstract: A method for assisting in locating a position of a mobile wireless device includes: obtaining location information of an approximate location of the mobile wireless device; generating an almanac of base stations based at least in part on proximity of locations of the base stations to the approximate location of the mobile wireless device, the almanac of base stations comprising at least one cooperative terrestrial base station that can communicate with the mobile wireless device in at least one mode and at least one uncooperative terrestrial base station capable of bi-directional communications and configured to prevent data and voice communications with the mobile wireless device, the at least one uncooperative terrestrial base station being configured to acknowledge a message received from the mobile wireless device; and providing the almanac of base stations to the mobile wireless device.

Abstract: An antenna arrangement for the reception of circularly polarized satellite radio signals having a free space wavelength ? and a frequency f comprises at least one circularly polarized satellite reception antenna positioned above an electrically conductive base surface whose outline is inscribed by a circle K about its phase center PZ having a relative antenna radius ra/?<0.15. A director is present that comprises a horizontal electrical conductor that has two conductor ends and that is guided over a director length Ld at a director height hd above the conductive base surface. The horizontal electrical conductor is angled at its two conductor ends and extends from there as vertical conductor in each case toward the conductive base surface.

Abstract: A method and devices are disclosed that increase the range of active geo-location from the airborne measuring station as compared with known methods by increasing the effective receive sensitivity of the airborne measuring station. In one embodiment, this may be accomplished by transmitting a burst of predetermined ranging packets and recording the correlation values of each received bit stream of the response packets with the corresponding predetermined bit streams for each of the transmitted ranging packets within a preset reception window. A rolling maximum is then performed on the correlation values in each reception window. At the end of the burst, the rolling maximum results are summed and the time of the peak value is determined.

Abstract: Un-differential correction distributed processing system and method based on a receiver of a reference station, in which main calculation tasks of conventional centralized data processing are transferred to the receiver of the reference station. The receiver of the reference station executes tasks of the PPP calculation, the PPP un-differential ambiguity fixing and the un-differential correction product generating via data interaction with servers. The client generates a relevant virtual un-differential correction by visiting a reference station area code address server and achieves PPP-RTK calculation under area augmentation. Load of server is greatly reduced, and problem of overload on relevant servers is solved; meanwhile, there is no need for the client to arrange a machine room of servers that needs specially-assigned person on duty, thus reducing user's maintenance work on the servers and saving costs.

Abstract: An apparatus receives values of parameters defining an orbit of a satellite of a satellite navigation system for a validity period. The apparatus furthermore determines whether a received value of at least one parameter of a predetermined set of the parameters is saturated. The apparatus then takes into account whether a received value of at least one parameter of the predetermined set of parameters is determined to be saturated in a process of extending the validity period of the received values of parameters.

Abstract: A method and system for automatically updating a current time zone of a smart watch by using the smart watch to acquire longitude and latitude data corresponding to a current location of the smart watch and to provide the longitude and latitude data to a mobile terminal to generate time zone information that is then provided to the smart watch.

Abstract: A mobile transceiver having multiple subscriber identity module (SIM) cards and a method of selection is provided. In accordance with one embodiment, there is provided a method of operating a mobile transceiver, comprising: waking up the mobile transceiver from a low power mode; selecting a first subscriber identity module (SIM) card from a plurality of SIM cards; activating a cellular transceiver using the first SIM card; searching, via the cellular transceiver, for available wireless services associated with the first SIM card; and switching from the first SIM card to a second SIM card in the plurality of SIM cards when a wireless service for the first SIM card is not available.

Abstract: Implementations relate to systems and methods for location assistance using devices (104) in a personal area network (PAN). In one scenario, a user may use two separate location-enabled devices, such as a wearable personal device (102) and a cellular telephone device (104). In cases, one of those devices may have reached a higher or farther-developed state in terms of generating or storing location information (108) for the user's current position, as compared to the opposite device. This can take place, for instance, when the first (e.g. wearable) device (102) is first turned on. The two devices use platforms and techniques to exchange location information and carry out GPS or other operations to furnish the device that is lagging in position processing progress with assistance which will speed up or otherwise enhance the position fix for that device.

Abstract: Methods and apparatus for efficient transmission of data by half-duplex transceivers in satellite communication systems are provided. Time reference for the return link is skewed or time-lagged relative to the time reference for the forward link to reduce the amount of guard time required to separate return link transmission from forward link reception by the half-duplex transceiver of a user terminal. The guard time is determined based on a maximum differential round-trip propagation delay and transition times of the half-duplexer transceiver to switch between transmit and receive modes. In a satellite communication system in which a large number of active user terminals are present in a beam coverage, random time offsets are applied to spread approximately equal traffic loads across the time offsets.

Abstract: The present disclosure relates to the communications field, and provides a frame synchronization method, user equipment, and a base station, to implement frame time synchronization in a high-low frequency hybrid communications system. In one example method, a user equipment completes synchronization of a first frequency frame, determines a first moment of the synchronization of the first frequency frame, obtains a receive time difference, and completes synchronization of a second frequency frame according to the receive time difference and the first moment. The receive time difference is a time difference between a moment at which the user equipment receives the second frequency frame and a moment at which the user equipment receives the first frequency frame.

Abstract: A method of providing accurate position, navigation, and timing information comprising the steps of providing at least four transceiver devices, providing an auxiliary GPS device, and providing a receiver GPS device. Each transceiver devices receives a plurality of GPS signals from a plurality of GPS satellites, and calculates a transceiver position and transceiver velocity vector. The transceiver position, transceiver velocity vector, and GPS signal are repackaged at each transceiver into a first spread signal structure, which is transmitted from each transceiver as a first GPS-like signal. The GPS-like signal is received at an auxiliary GPS device, which generates a simulated GPS signal. This simulated GPS signal is then output and received by a simulated GPS device.

Abstract: A radio receiver has a front end having a shared amplification path for both radio frequency signals and intermediate frequency signals. In one example, the shared amplification path can include a low noise amplifier and an attenuator. By amplifying both radio frequency (RF) signals and intermediate frequency (IF) signals with the same shared amplification path, gains in power efficiency, and reductions in cost and circuit size can be achieved.

Abstract: Various arrangements are presented for using an estimated timing advance for user equipment communications. A location of an instance of user equipment may be determined. A first estimated distance between the user equipment and a communication satellite may be determined using the determined location of the user equipment and an estimated satellite location. A second estimated distance between the communication satellite and a communication network gateway may be determined. An estimated timing offset using the calculated first estimated distance and the determined second estimated distance may be determined. An uplink data frame may be transmitted by the user equipment to the satellite such that a timing of transmission of the uplink data frame is based on the calculated estimated timing offset.

Abstract: Processing GPS drifting. A method and system for processing GPS drifting is included. The method includes: determining predicted error information on position correction of a device within a region; obtaining a GPS initial position and a corrected position of the device within the region; and determining GPS drifting of the region based on the predicted error information, the GPS initial position, and the corrected position of at least one device within the region. The method and system of the present application can effectively ameliorate GPS drifting issues.