Coherent radar receiver that comprises a sigma delta modulator
First Claim
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1. A system that is configured to receive and process coherent signals, the system comprising:
- a receiver that comprises;
an antenna that is configured to receive a pulsed signal; and
an integrated circuit that comprises;
a coherent signal sampler that is configured to coherently sample a pseudorandom sequence to generate a reference signal, the pseudorandom sequence used to modulate a transmitted signal, the pulsed signal based upon the transmitted signal; and
a sigma delta modulator, the sigma delta modulator configured to receive an analog signal and convert the analog signal to a digital signal, the analog signal based upon the pulsed signal and the reference signal.
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Abstract
Described herein are various technologies relating to processing a coherent signal. A receiver is configured to receive an analog signal, and process the analog signal to generate an input analog signal. The input analog signal has been modulated according to a suitable modulation sequence. A coherent signal sampler coherently samples the modulation sequence, and the result of such sampling is in turn used to demodulate the input analog signal. The resultant signal is then passed to a sigma delta modulator, where it is converted to digital form.
29 Citations
20 Claims
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1. A system that is configured to receive and process coherent signals, the system comprising:
a receiver that comprises; an antenna that is configured to receive a pulsed signal; and an integrated circuit that comprises; a coherent signal sampler that is configured to coherently sample a pseudorandom sequence to generate a reference signal, the pseudorandom sequence used to modulate a transmitted signal, the pulsed signal based upon the transmitted signal; and a sigma delta modulator, the sigma delta modulator configured to receive an analog signal and convert the analog signal to a digital signal, the analog signal based upon the pulsed signal and the reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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a transmitter that is configured to transmit an output analog signal towards a target, the output analog signal being a pulsed signal; and a receiver comprising; an antenna that receives an echo signal, the echo signal being the output analog signal responsive to the output analog signal reflecting off of the target; an integrated circuit that is operably coupled to the antenna, the integrated circuit configured to receive an input analog signal, the input analog signal being a pulsed signal, the input analog signal based upon the echo signal received at the antenna, the integrated circuit comprises; a coherent signal sampler that is configured to coherently sample a pseudorandom sequence to generate a reference signal, the pseudorandom sequence used to modulate the output analog signal, the input analog signal based upon the reference signal; and a sigma delta modulator that converts a baseband analog signal to a digital signal, the baseband analog signal being a function of the input analog signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A coherent radar receiver comprising:
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antenna means for receiving a pulsed signal; sampling means for coherently sampling a pseudorandom sequence to generate a, reference signal, the pseudorandom sequence used to modulate a transmitted signal, the pulsed signal based upon the transmitted signal; and converting means that comprises a sigma delta modulator, the sigma delta modulator configured to receive an analog signal and convert the analog signal to a digital signal, the analog signal based upon the pulsed signal and the reference signal. - View Dependent Claims (18, 19, 20)
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Specification