Method and apparatus for digital compensation of VCO nonlinearity in a radar system
First Claim
1. An apparatus for processing time varying signals, said apparatus comprising:
- means for sampling a time varying signal and providing a sampled signal;
means for resampling said sampled signal at selected resample times; and
means for varying said selected resample times and providing a resampled time varying signal according to said varying selected resample times.
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Accused Products
Abstract
An apparatus for correcting for nonlinearities in modulation systems includes a transmitter (24, 28, 48, 50, 52) for transmitting a time varying modulated radar signal (56). A receiver (58, 62) receives an echo signal (60) resulting from reflection of the transmitted modulated signal (56). A mixer (48) compares the transmitted signal against the echo signal and providing a comparison signal indicative of the comparison. The comparison signal is sampled by an A/D converter (74). The A/D convertor (74) provides a sampled comparison signal to a controller/DSP (22). Controller/DSP (22) resamples the sampled comparison signal at selected resample times and effectively varies the selected resample times to correct for nonlinearities in the comparison signal resulting from nonlinearities of the transmitted time varying modulated signal.
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Citations
27 Claims
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1. An apparatus for processing time varying signals, said apparatus comprising:
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means for sampling a time varying signal and providing a sampled signal; means for resampling said sampled signal at selected resample times; and means for varying said selected resample times and providing a resampled time varying signal according to said varying selected resample times. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for correcting for nonlinearities in modulation systems, said apparatus comprising:
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means for transmitting a time varying modulated signal; means for receiving an echo signal resulting from reflection of said transmitted modulated signal; means for comparing said transmitted signal against said received echo signal and providing a comparison signal indicative of said comparison; means for sampling of said comparison signal and providing a sampled comparison signal; means for resampling said sampled comparison signal at selected resample times; and means for effectively varying said selected resample times so as to correct said comparison signal for nonlinearities in said comparison signal resulting from nonlinearities of the transmitted time varying modulated signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for processing time varying signals, said method comprising the steps of:
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sampling a time varying signal; providing a sampled time varying signal; resampling at selected times said sampled time varying signal; varying said selected resampling times; and providing a resampled time varying signal according to said varied selected resample times. - View Dependent Claims (18, 19, 20, 21)
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22. A method for correcting for nonlinearities in modulation systems, said method comprising the steps of;
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transmitting a time varying modulated signal; receiving an echo signal resulting from reflection of said transmitted modulated signal; comparing said transmitted signal against said echo signal and providing a signal indicative of said comparison; sampling said comparison signal and providing a sampled comparison signal; resampling said sampled comparison signal at selected resample times; and effectively varying said selected resample times so as to correct said comparison signal for deviations from a nominal constant frequency resulting from nonlinear frequency modulation of the transmitted signal. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification