Abstract: A test device determines time error in a fronthaul network of a radio access network. A first Global Navigation Satellite System (GNSS) receiver receives GNSS signals from a GNSS satellite through a reference GNSS signal distribution system (GSDS) having a known signal propagation delay. The first GNSS receiver calculates and outputs a corresponding reference One Pulse Per Second (1PPS) signal. A second GNSS receiver receives the GNSS signals through a device under test including a GSDS having an unknown signal propagation delay. The second GNSS receiver calculates and outputs a corresponding DUT 1PPS signal. The test device determines the unknown signal propagation delay of the DUT by comparing the reference 1PPS signal to the DUT 1PPS signal.

Abstract: A security cuff is disclosed. The security cuff includes a Global Positioning System (GPS) system. The GPS system is configured to provide a geographic location of a user wearing the security cuff. The security cuff further includes a double-locking restraint system, the double-locking restraint system comprising a first lock and a second lock.

Abstract: Described herein are different distributed sensor network models, use cases, and details of the components of each model to achieve the goal of monitoring, detecting, tracking, and mitigating a target(s) such as a signal, an object, a phenomenon, etc. An independent sensor or a local sensor network may supply data to one or more fusion center(s) that collect(s) data and perform(s) higher logic to enhance system performance. A local sensor network allows independent sensors or other local sensor networks to merge into the local sensor network. A sensor cloud can be formed by multiple local sensor networks and independent sensors. By using different distribution models, the local sensor network can provide protection for various targets like Very Important Personnel (VIP) vehicles, lands, facilities, and cities.

Abstract: A positioning method, as well as the system of base stations (T1,T2,T3) and detector (I) is based on measuring the propagation time difference of externally controlled electromagnetic pulses (F1,F2,F3) and the arrival signals of the controlled base station during a measurement cycle (t1+t2). In one embodiment, a reference clock is not required for measuring propagation time differences, but instead, accurate fixed distances between base stations can be used as a reference. System calibration is rarely performed. It checks the mutual locations of base stations. This may be partially automated. The positioning system does not require any sensors.

Abstract: A relative position of a mobile terminal with respect to a vehicle is measured. The mobile terminal includes a position-measurement-necessity determining unit and a position-measurement control unit, and the position-measurement-necessity determining unit determines whether it is necessary to measure the relative position depending on whether the mobile terminal is in a predetermined state when the mobile terminal enters from the outside to the inside of an out-vehicle communication area of a first vehicle communication unit. The position-measurement control unit causes a position measuring unit provided in the vehicle to measure the relative position when the position-measurement-necessity determining unit determines that it is necessary to measure the relative position.

Abstract: An information processing apparatus includes a positioning signal acquisition unit configured to acquire a positioning signal transmitted from a positioning satellite and a parameter acquisition unit configured to calculate a parameter preset based on the positioning signal. The information processing apparatus further includes an accuracy index calculation unit configured to calculate a positioning accuracy index from the parameter, and an output unit configured to output the positioning accuracy index.

Abstract: An apparatus control method includes: controlling a first frequency band receive chain, of an apparatus, to alternate being on and off with a first duty cycle, the first frequency band receive chain being configured to measure satellite signals within a first frequency band; determining one or more performance criteria; and controlling, based on the one or more performance criteria, a second frequency band receive chain, of the apparatus, to alternate being on and off with a second duty cycle, the second frequency band receive chain being configured to measure satellite signals within a second frequency band.

Abstract: An information processing apparatus includes a positioning signal acquisition unit configured to acquire a positioning signal transmitted from a positioning satellite and a parameter acquisition unit configured to acquire a parameter preset based on the positioning signal. The information processing apparatus further includes a storage unit configured to store a plurality of the parameters at a plurality of time points in a preset period, an accuracy index calculation unit configured to or calculating a positioning accuracy index from the plurality of stored parameters, and an output unit configured to output the positioning accuracy index.

Abstract: An unmanned aerial vehicle includes a main body and at least two rotor units configured to propel the unmanned aerial vehicle. The unmanned aerial vehicle includes at least two antenna units configured to receive a radio signal. The antenna units are located with respect to the main body such that the antenna units are assigned to different lateral sides of the main body. Further, a direction finding system is described.

Abstract: For cross-channel spectral analysis of measurement data from multiple recording units with independent sampling clocks, a processing method corrects phase mismatch between the data received over the different channels. Blocks of sampled measurement data are buffered in a hardware logic circuit and timestamps are associated with successive blocks through a hardware interrupt to a GPS receiver of each recording unit. For each first channel data block, the block's starting point, a closest point in time in a data block of the second channel, and the starting point of that second channel data block are determined, using GPS timestamps associated with those data blocks, nominal sampling rate and block size. Phase correction based on the time offset between starting points of the pairs of data blocks and the interval between starting points of successive blocks is applied in the frequency domain after a time-to-frequency domain transformation. Multiple frames of phase-corrected spectra may then be averaged.

Abstract: A method performed by a wireless device (110, 210, 410, 1200) is disclosed. The method comprises sending (801), to a network node (120, 115, 215, 220, 225, 460), a request for reference station transfer information. The method comprises obtaining (802) the reference station transfer information for at least one pair of satellites (235, 240). The method comprises determining (803) an integer ambiguity solution associated with a new reference station (230B) based on the obtained reference station transfer information and an integer ambiguity solution associated with a current reference station (230A).

Abstract: The present disclosure provides a vehicle positioning method, including: a first controller synchronously controlling each first beacon node to send a detection initial signal; a second controller determining a target beacon node among second beacon nodes and controlling the target beacon node to send a detection feedback signal; the first controller synchronously controlling each first beacon node to send a corresponding detection signal to be responded and recording a first moment of sending the detection signal to be responded; the second controller controlling the target beacon node to send a detection response signal; the first controller recording a second moment of receiving the detection response signal and determining a distance between each first beacon node and the target beacon node according to the first moment and the second moment, so as to determine a position of the target beacon node relative to the first vehicle.

Abstract: The present invention discloses a APNT service positioning and integrity monitoring method and system. The method includes the following steps: determining a positioning accuracy requirement in a target scene; when the positioning accuracy requirement is high-accuracy positioning, determining a position of an aircraft by adopting a combined positioning algorithm, and monitoring the integrity of a combined positioning by adopting a multi-solution separation mode; when the positioning accuracy requirement is low-accuracy positioning, judging whether the aircraft is a high-altitude user; if not, adopting an air-to-air positioning algorithm for a high-altitude user and a low-altitude user based on LDACS to determine the position of the aircraft, and adopting a least square residual method to monitor the integrity of the air-to-air positioning.

Abstract: A tire pressure monitoring system used for a vehicle includes a sensor unit, a receiving device, and a control device. The sensor unit is provided at each wheel of the vehicle, detects tire pressure of the each wheel with a tire pressure sensor and transmits data of the detected tire pressure by radio waves. The receiving device includes a receiving antenna that is provided at an outside of the vehicle to receive the data of the tire pressure transmitted from the sensor unit. The control device includes a data acquisition unit that acquires the data of the tire pressure received by the receiving device.

Abstract: The invention relates to a method for error evaluation in position determination, comprising time-synchronous recording of first and second position values, wherein the second position values are recorded by a different measuring method than the first position values; forming a first and a second trajectory (A, B) from the first and the second position values respectively; forming differential vectors (D) between first and second position values recorded at the same time; parallel-shifting the second trajectory (B) along a displacement vector (s) such that the amounts of the differential vectors (D) are minimized on average; evaluating the faultiness of the position determination on the basis of one or more amounts of the differential vectors (D) created as a consequence of the parallel shift.

Abstract: A method of enhancing the accuracy of a navigation system which includes a GNSS receiver. The method includes receiving navigation signals from at least one GNSS constellation and a LEO constellation. Position estimates will be made through implementation of a filter using successive readings of pseudoranges and carrier-phase measurements from the GNSS constellation and carrier-phase measurements from the LEO constellation.

Abstract: A method for associating an address with a fingerprint, according to an aspect of the present invention, comprises the steps of: receiving collected information including an address and a wireless LAN fingerprint; storing the received collected information; filtering multiple pieces of stored collected information according to addresses, on the basis of multiple pieces of collected information for adjacent addresses; and constructing a radio map by using the collected information filtered according to addresses.

Abstract: Disclosed is an approach for automatic detection of entrance(s). In particular, processor(s) could have access to counter data arranged to maintain counters that each respectively represent a count of how many times GNSS service has been obtained or lost in a respective one of a plurality of sub-areas. Given this, the processor(s) could detect a GNSS state change corresponding to an instance of GNSS service being obtained or lost in a particular sub-area and could responsively increment the respective counter associated with the particular sub-area. In turn, the processor(s) could make a determination that the respective counter is representing a count that is greater than other count(s) represented by counter(s) associated with other sub-area(s). And based at least on this determination, the processor(s) could deem the particular sub-area to include an entrance, thereby resulting in detection of the entrance.

Abstract: A precise point position and real-time kinematic (PPP-RTK) positioning method, including: when direct emission signals broadcast by a multi-system navigation satellite and a low-earth-orbit constellation are detected, determining raw observation data (S11); receiving navigation satellite augmentation information broadcast by the low-earth-orbit constellation, and a low-earth-orbit satellite precise orbit and precise clock difference (S12); using the navigation satellite augmentation information, the low-earth-orbit satellite precise orbit and precise clock difference and the raw observation data for precise point positioning (S13); or when comprehensive ground-based augmentation error correction information is received, using the navigation satellite augmentation information, the low-earth-orbit satellite precise orbit and precise clock difference, the raw observation data and the comprehensive ground-based augmentation error correction information for precise point positioning of ground-based augmentation (S

Abstract: A method or system can include or be configured to receive a set of satellite observations, receiving sensor data, determining a position estimate and associated positioning error for a rover based on the set of satellite observations and the sensor data, determine a protection level associated with the position estimate based on a set of potential faults, and optionally provide an alert when the positioning error exceeds the protection level.