Communications: directive radio wave systems and devices (e.g. – Determining distance – With pulse modulation
Patent
1996-12-18
1999-12-07
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With pulse modulation
342145, G01S 1328
Patent
active
059991194
ABSTRACT:
A CW radar range measuring system having a transmitter adapted to transmit a continuous wave radar signal phase encoded in accordance with a code and a receiver adapted to receive a radar return from the transmitted radar signal. The receiver includes an analog to digital converter section for converting a sequence of samples of the radar return into a corresponding sequence of digital words. A digital correlator/integrator is fed by the digital words and the code for providing an indication of radar return energy as a function of range from the transmitter. A processor is fed by the digital correlator/integrator for determining, from the indicated energy, target range. The system includes a frequency spectrum analyzer for determining a frequency spectrum of the digital words and wherein the processor determines the target Doppler frequency from such determined frequency spectrum. In one embodiment of the invention, the digital correlator/integrator is fed the digital words and the frequency analyzer is coupled between the digital correlator/integrator and the processor. In another embodiment of the invention the frequency analyzer is fed the digital words and the digital correlator/integrator is coupled between the frequency analyzer and the processor. In still another embodiment, target range may be determined to an accuracy less than that corresponding to a time delay of 1/f.sub.s, the rate the at which the phase of the transmitted signal is phase encoded.
REFERENCES:
patent: 4005420 (1977-01-01), McDonald
patent: 4042925 (1977-08-01), Albanese et al.
patent: 4078234 (1978-03-01), Fishbein et al.
patent: 5793327 (1998-08-01), Carnes et al.
Merrill I. Skolnik, "Introduction to Radar Systems", pub. McGraw-Hill, 1962, pp. 86 through 111.
Edited by Merrill I. Skolnik, "Radar Handbook--Second Edition", pub McGraw-Hill 1990, pp. 10.19 through 10.25.
Carnes, deceased I. Shaun
Marquis David A
Russell Mark E
Shollenberger Dean L
Pihulic Daniel T.
Raytheon Company
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