Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1998-10-05
2000-07-18
Gregory, Bernarr E.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342128, 342175, 342195, 342200, 342201, 342 89, 342 98, 342 99, 342100, 331 1R, 331 16, 331 17, 331107R, 331177R, G01S 7282, H03B 2300
Patent
active
060913568
ABSTRACT:
A source for a linear homodyne transceiver that generates repeated linear chirps. A YIG oscillator with a main coil and an FM coil receives a basic linear current ramp at the main coil to generate a chirp. The FM coil is coupled to receive a PLL error signal. The PLL receives a sample of the output signal from the YIG oscillator at one input and a linear chirp reference signal at the other input generated by a DDS chirp generator. Any variation between the linear chirp frequency at any instant and the actual frequency output by the YIG is corrected by an error signal to the FM coil to correct for nonlinearities of the YIG caused by variations in the chirp rate, the rate of change of frequency per second per chirp, temperature variations and microphonics.
REFERENCES:
patent: 5376938 (1994-12-01), Martinez et al.
Applied Microwave & Wireless, "Microwave Synthesizer Offers 500.mu.s Switching", Aug. 1998, p. 76.
Ashton John Hunt
Sanders Michael Lee
Fish Ronald C.
Gregory Bernarr E.
Sensor Concepts Incorporated
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