Abstract: Embodiments of the invention provide a method of detecting movement to aid GNSS receivers. By detecting when the user is stationary, the Doppler frequency estimation can be corrected or the SNR can be boosted more both of which lead to improved performance. The embodiments allow a GNSS receiver to process signals in when the signal level would otherwise be too low—for example indoors. The embodiments can improve performance when one or more satellites are temporarily blocked but one or more satellites are still being tracked.

Abstract: Using in-phase and quadrature components of a received signal, spatial and temporal information is utilized to generate a maximum likelihood coefficient from the measured data to geolocate an emitter of unknown frequency. In one embodiment an iso-Doppler contour is generated having regions of high correlation to estimate location in which the maximum likelihood calculation uses two factors, one derived from a single aperture and one derived from bearing estimates, with the region of highest correlation corresponding to emitter location. Hypothesized in-phase and quadrature signals corresponding to an emitter location describe what the signals received at the aperture should be if the emitter is of a predetermined frequency and at a predetermined location, with these estimates used in the maximum likelihood algorithm.

Abstract: A set of device parameters consisting of clock bias and position of a mobile device is determined without previous knowledge of the week number (WN) in that solutions of a set of equations derived from a least squares type weight function involving pseudoranges related to the device parameters via basic equations are attempted with a time of week (TOW) extracted from satellite signals and various week number candidates. A solution algorithm which iteratively solves the set of equations is used, each iteration step involving a linearization of the latter and resulting in corrections of the device parameters. After elimination of week numbers where the solution algorithm does not yield a solution a valid week number is selected from the remaining week numbers in that a deviation value is determined which reflects differential terms, i.e., differences between pseudorange values as measured and as derived from the set of device parameters according to the solution, e.g., by evaluation of the weight function.

Abstract: Disclosed are systems; apparatus and methods for tracking or locating a person that is lost or has an emergency. Personal locating apparatus is employed comprising a plurality of buttons, and/or a keypad and display, that define an on/off element, an OK element, a help element and a 911 emergency element, wherein the elements are used to select and deselect one of a predetermined number of operational modes. A global positioning system (GPS) receiver in the apparatus processes GPS signals received from GPS satellites to generate location data indicative of the location of the apparatus. A satellite transmitter is coupled to the processor that transmits the location data and a desired operational mode signal to a remotely located processing center via one or more communication satellites.

Abstract: Methods and apparatuses are provided for use with mode switchable navigation radios and the like. The methods and apparatuses may be implemented to selectively switch between certain operating modes based, at least in part, a mode-switching test that takes into consideration one or more non-timed test conditions to determine if mode-switching may be enabled.

Abstract: Disclosed is a method for receiving a radionavigation signal modulated by a composite waveform, the composite waveform comprising a linear combination with real-valued coefficients of a BOC(n1,m) component and a BOC(n2,m) component, n1 differing from n2; in which a correlation is performed between a local waveform and the composite waveform over a time interval of duration T, wherein the local waveform is a binary waveform, formed over the time interval by an alternating succession comprising at least one BOC(n1,m) waveform segment and at least one BOC(n2,m) waveform segment, the at least one BOC(n1,m) segment having a total duration of ?T, ? being strictly between 0 and 1, the at least one BOC(n2,m) segment having a total duration of (1??)T.

Abstract: A fast position tracking method and apparatus, the fast position tracking method including the operations of receiving a satellite signal from a plurality of satellites; demodulating satellite data received from a predetermined satellite from among the plurality of satellites by using a pseudo random noise code and a carrier which correspond to the satellite signal; estimating information about satellite data which is at a current time and which is from among the demodulated satellite data according to a real-time clock (RTC) counter; and determining a position.

Abstract: This invention discloses a method for enhancing a Global Navigation Satellite System (GNSS), such as Global Positioning System (GPS), location calculation by supplying carrier phase corrections within a GNSS receiver used with a multiple element Controlled Reception Pattern Antenna (CRPA) receiver. GNSS carrier phase measurements should be compensated for receiver hardware and directionally dependent antenna errors to obtain desired accuracies for high precision GNSS positioning applications. One technique successfully employed in Fixed Reception Pattern Antenna (FRPA) GPS sensors applies a simple directionally dependent set of correction factors to the measurement outputs. For the complex case of a GNSS receiver employing a CRPA and dynamic beam steering, however, the multiplicity of combinations of antenna element outputs makes the FRPA compensation technique impractical. Compensation of carrier phase measurements is a problem not addressed in previous GPS CRPA beam steering sensors.

Abstract: A method and corresponding apparatus are provided for phase correction in a deployable antenna system, in particular a redeployable HF surface wave radar phased array antenna system, the antenna system including a master control unit and a plurality of separate antenna elements which are relatively moveable to desired spaced-apart locations, wherein each antenna element is provided with RF signal processing means, the method including the steps of: (i) determining the relative positions of the antenna elements and the master control unit; (ii) transmitting a phase reference signal; and (iii) determining, on receiving the phase reference signal and using the relative positions determined at step (i), phase correction signals for each of the plurality of antenna elements.

Abstract: Methods and apparatus according to various aspects of the present invention operate in conjunction with a phased array system. The phased array system may include an array structural frame defining an array of module-receiving mounting locations. The phased array system may further include multiple array modules. Each array module may be adapted to be mounted in one of the mounting locations, and may include an antenna and a power source. The power source may supply power to the array module during an array transmit operation.

Abstract: A rapidly deployable HF surface wave radar phased array antenna system is provided, including a plurality of separate antenna elements that are relatively movable to desired spaced apart positions, each antenna element including a respective receiver for receiving HF radio signals, wherein, in order to determine and control properties of the radar system, each element includes a GPS receiver for determining the location of each element and for timing and frequency synchronization.

Abstract: A method is provided for determining the validity of a signal received by a GPS receiver. A signal that is unfiltered, either mathematically or electronically, is monitored to determine the variability of different occurrences of the signal. These occurrences, which may be sequential, are compared to each other in order to detect whether or not variation exists between one occurrence of the signal and a subsequent occurrence of the signal. If no variation exists, it is determined that the signal is invalid and that a loss of fix of the satellite signal has occurred. If sufficient variability exists in the signal, between successive occurrences, the signal is deemed to be valid and suitable for use to control a vehicle such as a marine vessel.

Abstract: Adaptive antenna beamforming may involve a maximum signal-to-noise ratio beamforming method, a correlation matrix based beamforming method, or a maximum ray beamforming method. The adaptive antenna beamforming may be used in a millimeter-wave wireless personal area network in one embodiment.

Abstract: Aspects of the disclosure provide methods for positioning transmitting stations, such as cell towers. Further, aspects of the disclosure provide a database for storing information of the transmitting stations. In addition, aspects of the disclosure provide methods for positioning a moving object having a receiver based on the database of the transmitting stations and wireless signals transmitted by the transmitting stations. The methods increase in-transit location visibility of shipment while reducing GNSS usage, and thus reduce power consumption. The methods allow positioning receiving stations when GNSS signals may not be available, such as due to interference.

Abstract: A timepiece provided with a liquid crystal display panel (9) for displaying thereon at least one of time information (5) and calendar information (4), wherein a solar battery unit (12) is provided to face at least a part of a visual recognition side surface of the liquid crystal display panel (9) or an opposite-side (lower-side) surface thereof, the light being applied to a power generation portion of the solar battery unit (12) through a transmission portion of the liquid crystal display panel (9) to generate electric power or what is displayed on the liquid crystal display panel (9) being visually recognized through a transmission portion of the solar battery unit (12), a timepiece circuit and the liquid crystal display panel (9) being driven by utilizing the electric power generated by the solar battery unit (12).