Coherent radar detection using non-coherent architecture
First Claim
1. A receiver in a radar system having a transmitter for producing pulses to be radiated by an antenna, the receiver comprising:
- means responsive to a transmitter produced pulse for performing complex demodulation of a waveform corresponding to the produced pulse;
means responsive to the complex demodulated waveform corresponding to the produced pulse for forming a filter representative of the pulses produced by the transmitter;
means for receiving a return signal corresponding to each pulse produced by the transmitter from the antenna;
means for performing complex demodulation of the return signal; and
means for correlating the complex demodulated return signal with the filter representative of the pulses produced by the transmitter.
1 Assignment
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Accused Products
Abstract
In a radar system having a transmitter that produces pulses to be radiated by an antenna and a receiver that detects target information, complex demodulation is performed on an attenuated and limited waveform of the transmitter produced pulse. A matched filter is generated responsive to the complex demodulated waveform that is a time reversed conjugate image of the waveform corresponding to the produced pulse. Complex demodulation is performed on the return signal received by the receiver corresponding the produced pulse and the complex demodulated return signal is correlated with the matched filter that corresponds to the time reversed conjugate image of the waveform of the produced pulse.
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Citations
51 Claims
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1. A receiver in a radar system having a transmitter for producing pulses to be radiated by an antenna, the receiver comprising:
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means responsive to a transmitter produced pulse for performing complex demodulation of a waveform corresponding to the produced pulse;
means responsive to the complex demodulated waveform corresponding to the produced pulse for forming a filter representative of the pulses produced by the transmitter;
means for receiving a return signal corresponding to each pulse produced by the transmitter from the antenna;
means for performing complex demodulation of the return signal; and
means for correlating the complex demodulated return signal with the filter representative of the pulses produced by the transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
means responsive the formed transmission pulse representative filter for generating a signal representing an average frequency of coefficients of central samples of the transmission pulse representative filter;
means responsive the correlated complex demodulated return signal for forming a signal representing an average frequency of peak centered samples of the correlated complex demodulated return signal; and
means responsive to the average frequency of the peak centered samples of the correlated complex demodulated return signal and the average frequency of the coefficients of central samples of the transmission pulse representative filter for generating a Doppler shift indicator.
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10. A method of detecting a target in a radar receiver of a radar system having a transmitter producing pulses for radiation by an antenna, the method comprising the steps of:
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performing a complex demodulation of a waveform corresponding to the pulse produced by the transmitter in the receiver;
forming a filter representative of the pulse produced by the transmitter responsive to the complex demodulated waveform in the receiver;
receiving a return signal corresponding to each pulse produced by the transmitter from the antenna;
performing complex demodulation of the return signal; and
correlating the complex demodulated return signal with the filter representative of the pulses produced by the transmitter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
generating a signal representing an average frequency of coefficients of central samples of the transmission pulse representative filter responsive the formed transmission pulse representative filter;
forming a signal representing an average frequency of peak centered samples of the correlated complex demodulated return signal responsive the correlated complex demodulated return signal for; and
generating a Doppler shift indicator responsive to the average frequency of the peak centered samples of the correlated complex demodulated return signal and the average frequency of the coefficients of central samples of the transmission pulse representative filter.
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19. A radar system comprising:
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an antenna;
a transmitter for producing pulses to be radiated by the antenna;
a receiver for detecting target information from return signals responsive to the pulses produced by the transmitter;
in the receiver;
means responsive to the pulses produced by the transmitter for performing complex demodulation of a waveform corresponding to a produced pulses;
means responsive to the complex demodulated waveform corresponding to the produced pulse for forming a filter representative of the pulses produced by the transmitter;
means for receiving a return signal corresponding to each pulse produced by the transmitter from the antenna;
means for performing complex demodulation of the return signal; and
means for correlating the complex demodulated return signal with the filter representative of the pulses produced by the transmitter. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
means responsive the formed transmission pulse representative filter for generating a signal representing an average frequency of coefficients of central samples of the transmission pulse representative filter;
means responsive the correlated complex demodulated return signal for forming a signal representing an average frequency of peak centered samples of the correlated complex demodulated return signal; and
means responsive to the average frequency of the peak centered samples of the correlated complex demodulated return signal and the average frequency of the coefficients of central samples of the transmission pulse representative filter for generating a Doppler shift indicator.
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28. In a receiver of a radar system having a transmitter producing pulses for radiation by an antenna, a computer usable medium having computer readable program code units embodied therein comprising:
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a first program code unit for performing a complex demodulation of a waveform corresponding to a pulse produced by the transmitter;
a second program code unit for forming a filter representative of the pulses produced by the transmitter responsive to the complex demodulated waveform;
a third program code unit for receiving a return signal corresponding to each pulse produced by the transmitter from the antenna;
a fourth program code unit for performing complex demodulation of the received return signal; and
a fifth program code unit for correlating the complex demodulated return signal with the filter representative of the pulses of produced by the transmitter. - View Dependent Claims (29, 30, 31, 32, 33)
a program code unit for generating a signal representing an average frequency of coefficients of central samples of the transmission pulse representative filter responsive the formed transmission pulse representative filter;
a program code unit for forming a signal representing an average frequency of peak centered samples of the correlated complex demodulated return signal responsive the correlated complex demodulated return signal for; and
a program code unit for generating a Doppler shift indicator responsive to the average frequency of the peak centered samples of the correlated complex demodulated return signal and the average frequency of the coefficients of central samples of the transmission pulse representative filter.
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34. A receiver in a radar system having a transmitter for producing pulses to be radiated by an antenna, the receiver comprising:
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a signal receiving unit including a coupler for receiving the pulse produced by the transmitter and a coupler for receiving from the antenna a return signal corresponding to each pulse produced by the transmitter;
a signal processor comprising;
a demodulator processing unit responsive to a transmitter produced pulse for performing complex demodulation of a waveform corresponding to the produced pulse;
a filter processing unit responsive to the complex demodulated waveform corresponding to the produced pulse for forming a filter representative of the pulses produced by the transmitter;
a demodulator processing unit for performing complex demodulation of the return signal; and
a correlating processing unit for correlating the complex demodulated return signal with the filter representative of the pulses produced by the transmitter. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
a processing unit responsive the formed transmission pulse representative filter for generating a signal representing an average frequency of coefficients of central samples of the transmission pulse representative filter;
a processing unit responsive the correlated complex demodulated return signal for forming a signal representing an average frequency of peak centered samples of the correlated complex demodulated return signal; and
a processing unit responsive to the average frequency of the peak centered samples of the correlated complex demodulated return signal and the average frequency of the coefficients of central samples of the transmission pulse representative filter for generating a Doppler shift indicator.
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43. A radar system comprising:
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an antenna;
a transmitter for producing pulses to be radiated by the antenna;
a receiver for detecting target information from return signals responsive to the pulses produced by the transmitter;
in the receiver;
a signal receiving unit including a coupler for coupling the pulse produced by the transmitter to the receiver and a coupler for receving a return signal corresponding to each produced pulse from the antenna; and
a signal processor comprising;
a demodulating processing unit responsive to the pulses produced by the transmitter for performing complex demodulation of a waveform corresponding to a produced pulses;
a filter processing unit responsive to the complex demodulated waveform corresponding to the produced pulse for forming a filter representative of the pulses produced by the transmitter;
a demodulating processing unit for performing complex demodulation of the return signal; and
a correlating processing unit for correlating the complex demodulated return signal with the filter representative of the pulses produced by the transmitter. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51)
a processing unit responsive the formed transmission pulse representative filter for generating a signal representing an average frequency of coefficients of central samples of the transmission pulse representative filter;
a processing unit responsive the correlated complex demodulated return signal for forming a signal representing an average frequency of peak centered samples of the correlated complex demodulated return signal; and
a processing unit responsive to the average frequency of the peak centered samples of the correlated complex demodulated return signal and the average frequency of the coefficients of central samples of the transmission pulse representative filter for generating a Doppler shift indicator.
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Specification