Exploitation of emitter RF agility for unambiguous interferomete

Details Exploitation of emitter RF agility for unambiguous interferomete Exploitation of emitter RF agility for unambiguous interferomete

1996-04-10

1997-07-29

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Determining direction

Interferometer

342 13, 342424, 342442, G01S 1306

Patent

active

056525907

ABSTRACT:
A method for use with a long baseline interferometer that unambiguously estimates the angle of arrival of an RF agile signal produced by an emitter. The angle of arrival estimate provided by the method may be used to resolve phase ambiguities inherent in the long baseline interferometer, thereby providing for the unambiguous estimation of the angle of arrival of the RF signal from the emitter. The RF agile signals processed to determine the phase thereof. The phase information contained in the energy radiated by the emitter is then processed to estimate the angle of arrival of the energy. The phase information contained in the RF agile signal is processed using the equations .phi.=(2.pi.fL/c) sin .theta., and .delta. sin .theta.=(c/2.pi.fL).delta..phi., where the phase (.phi.) is measured to a given error (.delta..phi.) to determine the direction of arrival (.theta.) of the energy radiated by the emitter. The angle of arrival of the received RF agile signal from the emitter is estimated by determining the rate at which the phase of the received RF agile signal changes. This provides an independent estimate of angle to the emitter which is used to resolve the ambiguous phase measurements provided by the long baseline interferometer. The angle of arrival of the received RF agile signal from the emitter is estimated using the equation ##EQU1## The direction of arrival of the energy from the RF agile emitter is selected as the angle derived from processing the phase rate with respect to frequency information, or the angle determined by processing the phase information as resolved by the angle produced by processing the phase slope information.

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