Intrapulse radar receiver
First Claim
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1. An intrapulse microwave radar receiver, comprised of:
- (a) first means for receiving and down-converting an incoming microwave signal and in response generating an intermediate analog signal,(b) second means for receiving and digitizing said intermediate analog signal and in response generating a plurality of digital signal samples, and(c) third means for receiving said digital signal samples in groups of three, performing a three point best-fit sinusoidal approximation of said digital signal samples and in response generating further digital signals representative of the intrapulse frequency and amplitude of said incoming microwave signal with respect to time.
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Abstract
A microwave frequency detection receiver for receiving an incoming analog radar signal, converting the radar signal into digital form, and performing a table lookup algorithm for detecting frequency and amplitude of the incoming signal with respect to time. The table lookup algorithm is in the form of a three point best-fit sinusoidal approximation of frequency and amplitude for processing successive digital input signal samples processed in groups of three. Digital sampling of the input signal coupled with the novel table lookup algorithm results in detection of frequency and amplitude characteristics on an intrapulse basis.
33 Citations
19 Claims
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1. An intrapulse microwave radar receiver, comprised of:
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(a) first means for receiving and down-converting an incoming microwave signal and in response generating an intermediate analog signal, (b) second means for receiving and digitizing said intermediate analog signal and in response generating a plurality of digital signal samples, and (c) third means for receiving said digital signal samples in groups of three, performing a three point best-fit sinusoidal approximation of said digital signal samples and in response generating further digital signals representative of the intrapulse frequency and amplitude of said incoming microwave signal with respect to time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 18)
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8. A method for receiving and detecting microwave radar signals, comprising the steps of:
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(a) receiving and down-converting an incoming microwave signal and in response generating an intermediate analog signal, (b) receiving and digitizing said intermediate analog signal and in response generating a plurality of digital signal samples, and (c) receiving and processing said digital signal samples in groups of three, performing a three point best-fit sinusoidal approximation of said digital signal samples and in response generating further digital signals representative of the intrapulse frequency and amplitude of said incoming microwave signal with respect to time. - View Dependent Claims (9, 10, 19)
- 19. A method as defined in claim 9, wherein said analog signal is digitized at a sampling rate of fs, each group of three digital signal samples is designated as Y0, Y1, and Y2, and said intrapulse amplitude for each said group of three digital signal samples is given by ##EQU5## the phase for each said group of three digital signal samples is given by
- space="preserve" listing-type="equation">C=arcsin (Y.sub.0 /A); and
the frequency for each said group of three digital signal samples is given by
space="preserve" listing-type="equation">B=(arcsin (Y,/A)-C) f.sub.s /2 . - space="preserve" listing-type="equation">C=arcsin (Y.sub.0 /A); and
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Specification