Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1994-04-04
1994-12-27
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342132, 342173, G01S 740
Patent
active
053769384
ABSTRACT:
A homodyne radar apparatus and method for performing radar cross-section surement by maintaining the linearity and compensating for frequency drift of an FM chirp waveform produced by a YIG tuned oscillator. A digital computer uses a predetermined data look-up table of each YIG oscillator frequency characteristic in conjunction with a digital to analog converter to provide a compensating sweep signal to linearize the frequency output of the oscillator. The computer uses an analog to digital converter in conjunction with a reference circuit output to compare the actual YIG signal nulls resulting from the reference circuit to the nulls in a signal produced by a lab standard oscillator in the reference circuit to adjust start sample delay of the ADC and to correct any frequency drift evidenced by the difference in the null of the signal.
REFERENCES:
patent: 4539565 (1985-09-01), Norsworthy
patent: 5189427 (1993-02-01), Stove et al.
patent: 5252981 (1993-10-01), Grein et al.
patent: 5291200 (1994-03-01), Lo
Ashton John H.
Martinez Roger I.
Sanders Michael L.
Gilbert Harvey A.
Hellner Mark
Sliwka Melvin J.
The United States of America as represented by the Secretary of
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