Continuous wave correlation radar system
First Claim
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1. A radar system comprising:
- a signal transmitter source of continuous wave electromagnetic energy of a single frequency;
means for generating a sinusoidal signal for frequency modulating said source;
code means for generating a p-bit pseudo-random binary code; and
means for phase-modulating said frequency modulated source with said pseudo-random code.
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Abstract
A CW radar transmitter is simultaneously frequency modulated with a sinusal wave and phase-modulated with a pseudorandom binary code. Both the frequency of the FM signal and the bits and bit duration in the binary code can be varied to change the resolution and range of the system.
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Citations
14 Claims
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1. A radar system comprising:
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a signal transmitter source of continuous wave electromagnetic energy of a single frequency; means for generating a sinusoidal signal for frequency modulating said source; code means for generating a p-bit pseudo-random binary code; and means for phase-modulating said frequency modulated source with said pseudo-random code.
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2. A radar system comprising:
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antenna means; a signal transmitter source of continuous wave electromagnetic energy coupled to said antenna means; means for generating a sinusoidal signal of a first frequency f1 for frequency modulating said source; code means for generating a p-bit pseudo-random binary code of repetition frequency fr which remains fixed in phase and provides a zero range timing reference for the radar system; means for phase-modulating said source with said pseudo-random code; a receiver including means coupled to said antenna means and to said source for deriving from each target echo received by said antenna means and delayed by the round trip time and frequency translated by the Doppler shift fd owing to target motion relative to said antenna means a video frequency signal comprising the target doppler signal fd modulated upon a coded signal of frequency f1 ; reference code producing means for providing n distinct reference codes which are replicas of said p-bit code but delayed in time with respect thereto by n different amounts representing n corresponding range slots; and n correlation means for each of said n range slots coupled to said video frequency signal deriving means and receptive of a corresponding one of said reference codes for correlating said video frequency signals with said reference code, each of said n correlation means including phase sensitive demodulator means for extracting for each target within a given range slot the target doppler signal fd from said video frequency signal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification