Poor BSE estimation accuracy resulting from conventional Extended Kalman Filtering (EKF) approaches using RF OI sensors mounted on the ground as a remote bullet tracking sensor motivated the design and development of the present disclosure. The observer based BSE removes EKF process noise (state noise) and measurement noise (OI sensor noise) covariance matrices selection and tuning which have been long recognized by the estimation community as a time consuming process during the design stage; requires no consideration of interactions when having the control input signal as part of the state propagation equation; and provides a significant improvement in velocity estimation accuracy, in some cases to less than 1 m/s errors in all axes, thereby meeting the miss distance requirement with amble margin.

An information handling system operating a diverse wireless location determination system, comprising receiving an instruction to determine a location of an endpoint information handling system having a plurality of network interface device modules supporting a plurality of wireless network protocols, a processor executing instructions to aggregate data including detected time of flight (TOF) signal distance and signal quality values relating to signals exchanged between the endpoint information handling system and a plurality of diverse wireless protocol access points, the processor to determine at least three diverse wireless protocol access point signals meet a signal quality threshold, where at least two of the diverse wireless protocol access points operate under different wireless protocols, and the processor conducting weighted multiangulation or multilateration utilizing the detected TOF signal distances of the exchanged signals based on the detected signal quality category and type of wireless protocol for the exchanged signal.

A transceiver for a wireless communication system is configured to: communicate with at least one other transceiver of the system using a sidelink resource pool of the system; transmit signals on resources of the pool that are allocated to the transceiver on a period basis with equal length periods t.sub.periodA; transmit a first signal on a first resource of the resources allocated to the transceiver, and receive a second signal from another transceiver of the system on a second resource, the second signal being transmitted by the other transceiver responsive to a reception of the first signal, the second signal being transmitted by the other transceiver on the second resource using the period t.sub.periodA based on which the resources are allocated to the transceiver; determine a distance to the other transceiver based on a time t.sub.roundA between the transmission of the first signal and the reception of the second signal from the other transceiver, and based on the period t.sub.periodA based on which the resources are allocated to the transceiver.

Disclosed, among other things is a wide area direction finding system comprising multiple radio frequency (RF) receiving units and a display computer. The RF receiving units may be in different geographic areas to make use of triangulation to precisely locate a target, allowing for increased area coverage and accuracy when locating a target. Locating a target may draw from real-time information using a live mode, or from a past event using a history mode on the display computer.

A split architecture is disclosed for determining the location of a wireless device in a heterogeneous wireless communications environment. A detector within the device or another component of the environment receives signals including parameters for a localization signal of the device. The parameters describe known in advance signals within the signals. Additional metadata including each frame start of the signals and assistance data and auxiliary information are also received. The known in advance signals are detected based on the parameters of the localization signal. Samples extracted from the known in advance signals are then processed and compressed and sent with other collect data to a locate server remote from the detector. The location server uses that information as well as similar information about the environment to calculate the location of the device, as well as perform tracking and navigation of the device, and report such results to the environment.

One aspect is a network system including a network sewer and a plurality of gateway hosts coupled to the network server and each including a sectorized antenna and defining a plurality of gateway areas. An overlapping gateway grid includes the plurality gateway areas, each gateway area including sectors. The network system includes a plurality of endpoints, each sending and receiving 10 communication signals to and from at least two gateway hosts, and each comprising an oscillator calibrated with a clocking frequency. The network server determines the location of a target endpoint by sending communication signals between two selected sectorized antennas and the target endpoint to determine one sector from each of the two selected sectorized antennas in which the target endpoint is located, 15 and by calculating the time-of-flight for the communication signal to travel between each of the selected sectorized antennas and the target endpoint.

One aspect is a network system including a network sewer and a plurality of gateway hosts coupled to the network server and each including a sectorized antenna and defining a plurality of gateway areas. An overlapping gateway grid includes the plurality gateway areas, each gateway area including sectors. The network system includes a plurality of endpoints, each sending and receiving 10 communication signals to and from at least two gateway hosts, and each comprising an oscillator calibrated with a clocking frequency. The network server determines the location of a target endpoint by sending communication signals between two selected sectorized antennas and the target endpoint to determine one sector from each of the two selected sectorized antennas in which the target endpoint is located, 15 and by calculating the time-of-flight for the communication signal to travel between each of the selected sectorized antennas and the target endpoint.

A method, apparatus and computer readable storage medium are provided that are configured to obtain or hold available radio map information representing a radio map representing a plurality of radio models for a plurality of radio devices. Each radio model is indicative of an expected radio-signal-strength field of a radio signal transmitted by a respective radio device of the plurality of radio devices. The method, apparatus and computer readable storage medium are also configured to determine, at least partially based on the radio map information, one or more round-trip-time positioning sections of an environment covered by the radio map and to provide round-trip-time positioning information causing estimating a position of a mobile device at least partially based on round-trip-times associated with radio signals observed by the mobile device within one of the one or more round-trip-time positioning sections of the environment covered by the radio map.

A system and method for a second wireless device to establish distance and location of a first device which is transmitting radio waves includes the first and second devices. Each second device includes two or more (N in number) receiving antennas. An angle between the directions in which adjacent receiving antennas receive the strongest signals is 360/N. The second device obtains a received signal strength indicator (RSSI) of each receiving antenna receiving signals from the first device, and from the two strongest receiving antennas, calculation of an angle between the first device and one of the adjacent receiving antennas can be performed. The distance between the first device and the second device can also be calculated.

In one implementation, a method includes receiving versions of a message from a first satellite-based receiver and a second satellite-based receiver that both received a radio frequency (RF) transmission of the message, the message comprising a self-reported position of a transmitter of the message. The method also includes determining a time difference between a first arrival time of the RF transmission of the message at the first satellite-based receiver and a second arrival time of the RF transmission of the message at the second satellite-based receiver. The method further includes determining a measure of the likelihood that the self-reported position of the transmitter is valid based on the time difference between the first and second arrival times. The method still further includes transmitting an indication of the measure of the likelihood that the self-reported position is valid.