Abstract: The present disclosure discloses a method and a system for preventing leakage of Beidou differential positioning data. The method includes the following steps: step 1, determining the number of positioning terminals; step 2, making identification cards, wherein one identification card corresponds to one positioning terminal, and writing data into each identification card; step 3, putting the identification cards into the card slots of the positioning terminals corresponding to the identification cards; step 4, verifying whether the read data is accurate; step 5, generating the Beidou differential positioning data by the positioning base station, a positioning satellite and the positioning terminals operating normally. The system includes a positioning base station, a positioning satellite, a service terminal, a card issuing device, a plurality of identification cards and a plurality of positioning terminals.

Abstract: A system and method generates a phase scintillation map that is utilized to de-weight satellite signal observations from GNSS satellites. One or more base stations each assign an index value to one or more GNSS satellite in view, where the index value indicates an adverse effect of ionospheric scintillation on signals received from the GNSS satellite. The values and identifiers may be transmitted to a server. The server utilizes the received information to generate the phase scintillation map that may include one or more scintillation bubbles, wherein a location of each scintillation bubble is based on the received information. The phase scintillation map is transmitted to one or more rovers. The rover determines if a pierce point associated with a selected GNSS satellite in view of the rover falls within the boundaries of a scintillation bubble. If so, satellite signal observations from the selected GNSS satellite are de-weighted.

Abstract: A method and system for tracking the real-time positions of airport ground vehicles, and integrating the positional data into the Automatic Dependent Surveillance-Broadcast (ADS-B) network infrastructure. The system may include one or more ground receiver stations that receives positional telemetry data from one or more airport ground vehicles, and transmits the ground vehicle positional data to a centralized ground base station. A computer system connected to the ground base aggregates the ground vehicle telemetry data from one or more ground vehicles, converts the aggregate telemetry data into an ADS-B compatible data protocol, and integrates that data into the ADS-B network infrastructure for dissemination and reporting across the ADS-B network. The method enables the use of and dissemination of ADS-B information for ground vehicles without the need for ADS-B transponders on each ground vehicle.

Abstract: Transmitter tracking systems and methods are provided that utilize a phased array antenna. With the antenna forming a beam that is pointed in a first direction for a first frequency, a plurality of radio frequency (RF) signals, each associated with different carrier frequency and produced by a first transmitter, are received. The amplitudes of the received signals are used to determine whether the beam is pointed at the first transmitter. The amplitude information can also be used to determine a direction in which to point the beam if it is determined that the beam is not pointed at the first transmitter. The systems and methods can be applied to 5G, satellite communication, or other systems incorporating a phased array antenna.

Abstract: A system and method for determining a receiver position can include determining a receiver position based on a set of satellite observations, determining the receiver position based on sensor measurements, determining a satellite observation discontinuity; based on the satellite observation discontinuity, determining a second receiver position.

Abstract: A first apparatus assembles assistance data for a satellite signal based positioning of a device, the assistance data comprising a satellite specific ionospheric model for at least one specific satellite and a time stamp that relates the satellite specific ionospheric model to particular ephemeris data for the at least one specific satellite. The assistance data is provided for transmission. A second apparatus receives the assistance data and computes a position of the device making use of the particular ephemeris data and of the satellite specific ionospheric model.

Abstract: A method and system for installing a terrestrial antenna for a satellite communication network. In the system and method, a remote unit is provided to an installation location for the terrestrial antenna. The remote unit is configured to communicate with a satellite of the satellite communication network and includes a memory in which is stored antenna information pertaining to positioning of the terrestrial antenna with respect to a virtual beam generated by the satellite. The information is accessible by a code. Thus, the antenna information is access from the memory at the installation location using the code, and the terrestrial antenna in relation to a virtual beam generated by the satellite based on the antenna information accessed from the memory at the installation location.

Abstract: Sensor-assisted location technology is disclosed. Primary location technologies, such as GPS, can be used to determine the current location (e.g., a location fix) of a location-enabled device. In some instances, the primary location technology may be unreliable and/or consume more power than an alternative location technology. Sensors, such as accelerometers, compasses, gyrometers, and the like, can be used to supplement and/or increase the accuracy of location data. For example, a location-enabled device can identify an area with unreliable GPS location data and use sensors to calculate a more accurate location. Areas identified may be crowd-sourced. Sensors can be used to identify errors in the location data provided by primary location technology. Sensors can be used to modify a sampling interval of the primary location technology. Sensor can be used to smooth motion on a user interface between sampling intervals of the primary location technology.

Abstract: The present disclosure is directed to systems and methods that include a beacon that includes an antenna; data storage configured to store a code that is calculated according to an algorithm and based on a first variable, the first variable being defined according to a first interval of time; and a processor configured to cause the code to be emitted by the beacon.

Abstract: A phased-array includes, in part, N transceivers each including a receiver and a transmitter, and a controller. The phased array is configured to transmit a first radio signal from a first element of the array during a first time period, receive the first radio signal from a second element of the array, recover a first value associated with the radio signal received by the second element, transmit a second radio signal from the second element of the array during a second time period, receive the second radio signal from the first element of the array, recover a second value associated with the radio signal received by the first element, and determine a first phase of a reference signal received by the second element from the recovered first and second values. The first phase is relative to a second phase of the reference signal received by the first element.

Abstract: Systems and methods for receiving GNSS and corrections signals by a GNSS rover. The GNSS rover may include a radome enclosing a GNSS antenna and a GNSS front end. The GNSS rover may also include a corrections antenna attached to a connection housing and configured to receive corrections signals from a base station. The connection housing may be configured to removably attach to the radome. The GNSS rover may further include a corrections front end enclosed within the radome and electrically coupled to the corrections antenna via capacitive coupling when the connection housing is removably attached to the radome. The GNSS rover may further include a first capacitor plate enclosed within the radome and positioned substantially parallel to an outer wall of the radome and a second capacitor plate enclosed within the connection housing and positioned substantially parallel to an outer wall of the connection housing.

Abstract: In a vehicle, a vehicle body-side apparatus is configured to perform a main area determination and an auxiliary area determination. The main area determination determines whether a portable terminal is present in a main area based on a first reception intensity measured by the vehicle body-side apparatus in a wireless signal from the portable terminal. The auxiliary area determination determines whether the portable terminal is present in an auxiliary area based on a second reception intensity measured by a vehicle tire-side apparatus in a wireless signal from the portable terminal.

Abstract: The subject matter disclosed herein relates to determining a background location of a mobile device using one or more signal metrics.

Abstract: A radio frequency identification (RFID) system includes an array of antennas to distinguish line-of-sight (LOS) paths from non-line-of-sight (NLOS) paths. The distance between adjacent antennas in the array of antennas is less than half the wavelength of the radio frequency (RF) signal of the system. Each antenna in the antenna array is also digitally controlled to change relative phase difference among the antennas, thereby allowing digital steering of the array of antennas across angles of arrival (AOAs) between 0 and ?. The digital steering generates a plot of signal amplitudes as a function of AOAs. LOS paths are distinguished from NLOS paths based on the shapes (e.g., depth, gradient, etc.) of local extremes (e.g., maxima or minima) in the plot.

Abstract: A satellite communication assembly includes a transmit antenna array including a matrix of antenna elements, a receive antenna array, and a transmit circuit for the transmit antenna array. The transmit circuit includes, for each of the antenna elements, a first splitter, a second splitter, a first pair of phase shifters, a second pair of phase shifters, a first pair of variable gain amplifiers, a second pair of variable gain amplifiers, a first pair of power amplifiers, a second pair of power amplifiers, a first combiner, and a second combiner.

Abstract: A terrestrial high frequency data communication system and method for implementing a pointing algorithm for endpoint nodes are described. The system includes an aggregation node and one or more endpoint nodes. In one example, a pointing direction for an endpoint node is determined based on a number of packet error rate (PER) measurements associated with a high frequency data communication link between the endpoint node and an aggregation node. Preferably, the endpoint node includes a steerable antenna module that includes one or more antennas. The steerable antenna module is configured to receive an azimuth value and an elevation value determined based on PER measurements associated with the high frequency data communication link, and to steer its one or more antennas based on the azimuth value and the elevation value to point to the aggregation node.

Abstract: Disclosed are methods for aiding a mobile device in the acquisition of positioning reference signals (PRSs) transmitted in a cellular network in support of OTDOA positioning. In one implementation, a mobile device receives an offset parameter from a location server indicative of a difference in timing between transmission of a first PRS positioning occasion for a reference cell and transmission of a second PRS positioning occasion for a neighboring cell that supports multiple PRS configurations, where the second PRS positioning occasion is for a PRS configuration with a longest periodicity. The mobile device may determine an expected timing of PRS positioning occasions for other PRS configurations for the neighboring cell based on the offset parameter and may measure a Reference Signal Time Difference for the neighboring cell using the expected timing.

Abstract: An apparatus for determining information on a position of a transmitter. In one example, the apparatus includes an antenna apparatus, a control apparatus and a data processing apparatus. The antenna apparatus includes several different directional characteristics, wherein the directional characteristics are each related to an amount of spatially different receive sensitivities of the antenna apparatus. The control apparatus influences the antenna apparatus such that at least one of the directional characteristics of the antenna apparatus is activated. With the activated directional characteristic, the antenna apparatus receives a signal originating from the transmitter. The data processing apparatus processes the received signal and the amount of spatially different receive sensitivities allocated to the related activated directional characteristic to an amount of weighted receive values and determines the information on the position of the transmitter therefrom.

Abstract: A method and apparatus for improving data quality using GNSS. The method is implemented through middleware for existing GNSS survey systems. The method and device automatically analyze streams of GNSS messages from a GNSS receiver mounted to a GNSS survey pole for preconfigured conditions and also automatically measure an angle or tilt of the GNSS survey pole. The middleware automatically locks onto a location point reading of the GNSS receiver when the GNSS survey pole is positioned in an acceptable vertical position, and any preconfigured conditions within the stream of GNSS messages are met. The middleware automatically repeats the GNSS message of the location point instead of the continuing live stream of data to enable a GIS or other system to collect the location point.

Abstract: An RF position tracking system for wirelessly tracking the three-dimensional position of a tracked object. The tracked object has at least one mobile antenna and at least one inertial sensor. The system uses a plurality of base antennas which communicate with the mobile antenna using radio signals. The tracked object also incorporates the inertial sensor to improve position stability by allowing the system to compare position data from radio signals to data provided by the inertial sensor.