Compensation for radar path length variation and phase error

Details Compensation for radar path length variation and phase error Compensation for radar path length variation and phase error

1997-12-23

1999-09-14

Sotomayor, John B.

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

Synthetic aperture radar

342102, 342159, 342194, 342174, G01S 1390

Patent

active

059529555

ABSTRACT:
Methods that compensate for phase errors caused by path length variations in a radar system, and that compensate for relative phase errors in upconvertor and downconverter references employed in the radar system. One method samples a signal reflected from a duplexer through a receiver during the time the radar pulse is transmitted. The signal reflected from the duplexer is compared to a radar echo pulse on a single pulse basis. The phase of the sampled signal is subtracted from the phase of the received radar echo pulse reflected to determine the phase error. In a second method, multiple samples are collected during the time each radar pulse is transmitted. Samples of the signal reflected from the duplexer and the radar echo pulse are compared on a pulse to pulse basis. The phase differences are averaged across the pulse duration. The averaged phase differences are integrated on a pulse to pulse basis to determine the phase error.

REFERENCES:
patent: 3725915 (1973-04-01), Herman et al.
patent: 4219811 (1980-08-01), Herman et al.
patent: 4227194 (1980-10-01), Herman et al.
patent: 4339752 (1982-07-01), Williams et al.
patent: 5160932 (1992-11-01), Bull
patent: 5489906 (1996-02-01), McCord

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