Emitter Location Using Bearing Measurements from a Moving Platform
NAVAL RESEARCH LAB WASHINGTON DC
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An algorithm is derived for determining for the location of a stationary emitter based upon a number of angular measurements from a moving platform. It is referred to as the asymptotic algorithm and is particularly useful when there is appreciable error in the angle measurements. It is restricted to platform motion which generates a base line small in comparison to the range from the platform to the emitter. Under there conditions better results are obtained than from the standard least squares distance algorithm. This is accomplished with virtually the same amount of memory and computer logic. An algorithm that obtains emitter velocity as well as position is also given in the report. This algorithm, which requires a nonlinear maneuver by the platform, gives useful results when the system has good direction-finding accuracy and a capability for recording the time of a measurement. Typical results for both algorithms are presented in tables from which it is possible to judge the merits of the method for a particular application.
- Direction Finding