DIRECT GEOLOCATION FROM TDOA, FDOA AND AGL

摘要

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.

主权项

1. A method for estimating a location of a stationary emitter located on the Earth surface, the method comprising:
in an estimating engine provided with data collected during a plurality of time periods, the data including Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) measurements of a radar pulse sent from a stationary emitter located on the Earth surface and received by at least two antennas on an aircraft, and altitude measurements of the aircraft above the Earth surface: for each of the plurality of time periods, estimating a location of the stationary emitter based on the TDOA, FDOA, altitude measurements associated with a respective time period, the result being an estimated location of the stationary emitter associated with the respective time period, the estimated location of the stationary emitter including a candidate longitude and a candidate latitude of the stationary emitter; averaging the estimated locations associated with the plurality of time periods forming an averaged estimated location of the stationary emitter, the averaged estimated location including an average of the candidate longitudes and an average of the candidate latitudes of the stationary emitter; and providing the averaged estimated location of the stationary emitter.