A direct geolocation approach for estimating a location of a stationary emitter located on the Earth surface is provided. The approach uses data collected during a plurality of time periods including Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) measurements of a radar pulse sent from the emitter, and altitude measurements of an aircraft above the Earth surface. The approach includes estimating a location of the emitter for each of the time periods based on the TDOA, FDOA, and altitude measurements associated with a respective time period. The estimated location of the stationary emitter includes possible longitude and latitude of the emitter. The approach further includes averaging the estimated locations associated with the plurality of time periods to form an averaged estimated location of the emitter. A convenient example of the approach computes the location of the emitter based on the averaged estimated location.

A direct geolocation approach for estimating a location of a stationary emitter located on the Earth surface is provided. The approach uses data collected during a plurality of time periods including Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) measurements of a radar pulse sent from the emitter, and altitude measurements of an aircraft above the Earth surface. The approach includes estimating a location of the emitter for each of the time periods based on the TDOA, FDOA, and altitude measurements associated with a respective time period. The estimated location of the stationary emitter includes possible longitude and latitude of the emitter. The approach further includes averaging the estimated locations associated with the plurality of time periods to form an averaged estimated location of the emitter. A convenient example of the approach computes the location of the emitter based on the averaged estimated location.

The present invention relates to a method for determining a direction to a signal-emitting object by means of a platform comprising at least two antennas separated by a known distance. The method comprises said steps of: receiving, with each of said at least two antennas, a signal from said signal-emitting object at first positions, determining a first phase relation of said signal between said at least two antennas, receiving, with each of said at least two antennas, a signal from said signal-emitting object at at least second positions, determining at least a second phase relation of said signal between said at least two antennas, characterized by the steps of: determining change(s) in position(s) of at least one antenna of said at least two antennas, and determining a direction to a signal-emitting object based on said first phase relation, said at least second phase relation and said change(s) in position(s) of said at least one antenna. The invention further relates to a platform performing a determination of a direction to a signal-emitting object.

The present invention relates to a method for determining a direction to a signal-emitting object by means of a platform comprising at least two antennas separated by a known distance. The method comprises said steps of: receiving, with each of said at least two antennas, a signal from said signal-emitting object at first positions, determining a first phase relation of said signal between said at least two antennas, receiving, with each of said at least two antennas, a signal from said signal-emitting object at at least second positions, determining at least a second phase relation of said signal between said at least two antennas, characterized by the steps of: determining change(s) in position(s) of at least one antenna of said at least two antennas, and determining a direction to a signal-emitting object based on said first phase relation, said at least second phase relation and said change(s) in position(s) of said at least one antenna. The invention further relates to a platform performing a determination of a direction to a signal-emitting object.

There is disclosed a method of estimating the location of a plurality of electromagnetic signal sources, comprising: scanning at a first plurality of locations to generate signal source position data, the signal source position data representing estimates of the position of at least one of said signal sources; scanning at a second plurality of locations using a signal detection system to generate signal detection data, the signal detection data relating to signals received at the second plurality of locations from the signal sources; processing the signal source position data in dependence on the signal detection data to correct estimation errors in the signal source position data; and outputting the processed signal source position data.

There is disclosed a method of estimating the location of a plurality of electromagnetic signal sources, comprising: scanning at a first plurality of locations to generate signal source position data, the signal source position data representing estimates of the position of at least one of said signal sources; scanning at a second plurality of locations using a signal detection system to generate signal detection data, the signal detection data relating to signals received at the second plurality of locations from the signal sources; processing the signal source position data in dependence on the signal detection data to correct estimation errors in the signal source position data; and outputting the processed signal source position data.

A system for implementing a positioning functionality. An apparatus (e.g. a directional transceiver) (706) may receive a signal (704) for positioning and measure characteristics associated with the received signal (704). If the directional transceiver (706) then determines that the received signal (704) comprises calculator identifier information, the apparatus may forward the measured characteristics based on the calculator identifier information. Otherwise, the directional transceiver (706) may forward the measured characteristics to a buffer (712). From the perspective of the apparatus (700) transmitting the signal (704) for positioning, a determination may be made as to whether calculator identifier information is known. If determined to be known, the transmitting apparatus (700) may include the calculator identifier information in the signal (704) for positioning. Otherwise, the other apparatus may transmit the signal (704) for positioning without any calculator identifier information.

A system for implementing a positioning functionality. An apparatus (e.g. a directional transceiver) (706) may receive a signal (704) for positioning and measure characteristics associated with the received signal (704). If the directional transceiver (706) then determines that the received signal (704) comprises calculator identifier information, the apparatus may forward the measured characteristics based on the calculator identifier information. Otherwise, the directional transceiver (706) may forward the measured characteristics to a buffer (712). From the perspective of the apparatus (700) transmitting the signal (704) for positioning, a determination may be made as to whether calculator identifier information is known. If determined to be known, the transmitting apparatus (700) may include the calculator identifier information in the signal (704) for positioning. Otherwise, the other apparatus may transmit the signal (704) for positioning without any calculator identifier information.

The subject matter disclosed herein relates in one particular implementation to a method, apparatus, and/or system for acquiring one or more network-based measurements at a location server from a radio access network serving a user equipment (UE). A first message may be transmitted to the UE from the location server, where the first message comprises at least one of the one or more network-based measurements. A location of the UE is capable of being determined by the UE-based at least in part on the one or more network-based measurements.

An application that creates a dynamic ad hoc network by wirelessly linking a plurality of mobile Bluetooth transceivers. The dynamic ad hoc network enables communication between a transmitting Bluetooth transceiver and a receiving Bluetooth transceiver through at least one intermediary Bluetooth transceiver exclusive of other higher power consuming and expensive communication protocols, such as cellular networks. The network provides a number of solutions, including transportation management, traffic alerts, traffic telematics, information associated with road signs, warnings of speed limit changes, navigation, emergency scenarios (more specifically in a condition where a cellular network is inoperable or unavailable), etc. Navigation can utilize GPS, motion sensors, references from RF beacons signals, and the like to determine a user's location and routing.