First information corresponding to a radio signal received at a first sensing device from a candidate location is obtained. Second information corresponding to a radio signal received at a second sensing device from the candidate location is obtained. A first relationship between the first sensing device and the candidate location and a second relationship between the second sensing device and the candidate location are determined. A first inverse and a second inverse of respectively the first and second relationships are obtained. A first estimate of the radio signal at the first sensing device is determined from the first information and the first inverse. A second estimate of the radio signal at the second sensing device is determined from the second information and the second inverse. Energy emitted from the candidate location is measured based on the first estimate and the second estimate.

A technique for determining an estimated location of a radio network node (FBS) in a cellular network is disclosed. A method implementation of the technique comprises (a) determining, for each of a plurality of measurement reports sent by one or more User Equipments, UEs, (UE1) to one or more neighboring radio network nodes of the radio network node (FBS) in the cellular network, an estimated measurement location from which the respective UE (UE1) sent the respective measurement report, wherein each of the plurality of measurement reports includes signal strength information indicating a received signal strength from the radio network node (FBS) as measured by the respective UE (UE1), (b) for each of a plurality of pairs of the estimated measurement locations: dividing a surrounding area covering the estimated measurement locations of the respective pair into two subregions (Region I, Region II; Region III, Region IV), wherein every location in one of the two subregions (Region I, Region II; Region III, Region IV) is closer to one of the estimated measurement locations of the respective pair and every location in the other one of the two subregions (Region I, Region II; Region III, Region IV) is closer to the other one of the estimated measurement locations of the respective pair, and identifying, from the two subregions (Region I, Region II; Region III, Region IV) and based on the signal strength information included in the measurement reports belonging to the estimated measurement locations of the respective pair, the subregion (Region I, Region II; Region III, Region IV) in which the radio network node (FBS) is more likely located, and (c) determining the estimated location of the radio network node (FBS) as an intersected area of the identified subregions (Region I, Region II; Region III, Region IV).

A device and method for computing a relative direction to a Target, the device including a single antenna exchanging wireless signals with the Target, where the device moves from an initial position to additional positions, where in both positions the single antenna exchanges signals with the Target and the device measures distance-calculation-enabling properties of the wireless signal, where the device then estimates a distance to the Target based on the measured properties, where the device then computes a change in a distance between the DF electronic device and the Target according to the measured distance-calculation-enabling properties of the wireless signals in the initial position and the additional position, where the device then computes a relative direction of the Target from the DF electronic device's heading based on the change between the calculated distances and an associated changes in position of the DF electronic device.

A device for estimating a fixed position of a wireless communication is provided. The device comprises a radio connected to an antenna array, a memory and a process. The radio can receive a first signal transmitted from a first direction by the wireless communication device to the movable device, and a second signal transmitted from a second direction by the wireless communication device to the movable device. The processor can calculate a first angle of arrival (AOA) a second AOA. The processor can estimate the fixed position of the wireless communication device based on the first AOA, the second AOA, the first position and the second position.

Avalanche transceiver, and associated systems and methods are disclosed herein. In one embodiment, a method for identifying a location of a victim buried in an avalanche includes: emitting a signal by a transmitting transceiver of the victim; receiving the signal by a receiving transceiver; and identifying an orientation from the receiving transceiver to the victim based on constructing a straight line from the receiving transceiver to the transmitting transceiver.

Geolocating one or more emitters includes obtaining a set of lines of bearing (LOBs) indicative of location(s) of emitter(s), determining intersections of LOBs of the set and generating clusters informed by those intersections, assigning the LOBs of the set to cluster(s) based on proximity, identifying a cluster having the greatest number of assigned LOBs from the set; determining an emitter location area based on a best point estimate for the cluster, and indicating a location of an emitter as the emitter location area. Additional emitters can be located by removing from the set of LOBs those LOBs assigned to the identified cluster, and repeating aforementioned aspects. Initially, the set of LOBs can be selected from a larger collection as a representative subset thereof.

Systems and methods for detecting spoofing attempts are disclosed. In one embodiment, a ground station system for detecting a Global Navigation Satellite System (GNSS) spoof signal includes a receiver configured to receive data collected by a detection satellite that (1) is on a first orbit that is lower than a second orbit used by a GNSS satellite and (2) includes: a first antenna positioned to receive signals originating from a planetary surface, and a second antenna positioned to receive signals originating from the GNSS satellite on a higher orbit than the first orbit of the detection satellite. The ground station further includes one or more processors configured to calculate, using the time of arrival of the signal received at the first antenna and the position of the detection satellite determined based on the signal received at the second antenna, a geolocation of a source of the signal originating from a planetary surface.

Disclosed are a method and apparatus for transmitting, by a first terminal, a first positioning reference signal (PRS) for relative positioning in a communication system that supports sidelink communication that supports a sidelink according to various embodiments. Disclosed are a method comprising the steps of: receiving a second PRS requesting transmission of the first PRS from a second terminal; measuring an angle of arrival (AoA) on the basis of the second PRS; determining a first PRS pattern of the first PRS on the basis of the AoA; determining a time resource region in which the transmission of the first PRS is requested on the basis of a second PRS pattern of the second PRS; and transmitting the first PRS on the basis of the first PRS pattern and the determined time resource region, and an apparatus therefor.

A system and method established and maintains precision relative position, navigation, and timing (PNT) across a network of at least four mutually connected mobile platforms. In embodiments, a key (e.g., advantaged, absolute positioning capable) node of the network determines its pressure altitude and inertial state relative to its platform reference frame and receives inertial state and pressure altitude data from each neighboring node (in exchange for its own) to estimate the relative position and orientation of each neighbor node in its platform frame. The key node performs ranging to each neighboring node, and the neighboring nodes additionally range between each other and exchange ranging data with the key node. By correcting position and orientation estimates via ranging data, the key node determines and maintains extended relative PNT (e.g., in GPS-denied areas), which relative PNT solution is distributed across all network nodes.

A locating and communication method for a radio terminal by means of a satellite locating and communication system, which implements a first step, in the course of which the radio terminal transmits to a non-geostationary satellite a repeating sequence a predetermined number of times N for the same data packet, which is time-shifted by the same predetermined time shift Δτ each time is provided. Subsequently, a satellite access and processing ground station determines the location of the radio terminal from the data packets with access, which are extracted from a listening signal digitized and dated by the satellite and from the same detected sequence associated with said radio terminal, and from the ephemerides of the satellite by using a technique for measuring angle or angles of arrival by means of sequenced interferometry associated with a technique for measuring Doppler drift or drifts.