Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1997-12-23
2000-08-08
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342 98, G01S 502, G01S 1300
Patent
active
061008451
ABSTRACT:
A method and apparatus for determining from a moving observer the location, in terms of latitude, longitude, altitude, and velocity, of a stationary or moving radar emitting a pulsed or continuous-wave signal. The moving observer extracts from the radar signal significant electronic support measures (ESM) parameters, including frequency, pulse repetition interval, and pulse width, and determines from those parameters whether a radio frequency (RF) or pulse repetition frequency (PRF) measurement technique is appropriate, and whether the radar signal angle-of-arrival (AOA) must be computed. The emitter location is computed using a ratio of sequential frequency measurements, and the moving observer continues to collect frequency measurements until the location of the emitter can be established to within a predetermined degree of certainty.
REFERENCES:
patent: 4040054 (1977-08-01), Overman
Boettcher et al, "Object Oriented Design of Radar Warning Receiver Application Software", Proceedings IEEE/AIAA 10th, pp. 550-554, Oct. 1991.
Becker, K., "A General Approach to TMA Observability form Angle and Frequency Measurements" IEEE Trans on AES, vol. 32, No. 1, Jan. 1996.
Issing Gregory C.
Lett Gerald L.
Litton Systems Inc.
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