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Vehicular radar system with self-interference cancellation

  • US 9,791,551 B1
  • Filed: 04/25/2017
  • Issued: 10/17/2017
  • Est. Priority Date: 04/25/2016
  • Status: Active Grant
First Claim
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1. A radar system for a vehicle, the radar system comprising:

  • a plurality of transmitters configured for installation and use on a vehicle, wherein the transmitters are configured to transmit digitally modulated radio signals;

    a plurality of receivers configured for installation and use on the vehicle;

    wherein the transmitters and the receivers are configured to operate simultaneously in a same frequency spectrum during an operational period;

    wherein a first receiver of the plurality of receivers receives at least one interfering signal due to local signal coupling from at least one transmitter of the plurality of transmitters, and wherein the local signal coupling comprises at least one interfering path or mechanism;

    a spillover cancellation unit comprising a digital modulator configured to output a delayed, amplitude weighted, and phase changed replica of each of the at least one interfering signal transmitted by respective ones of the at least one transmitter of the plurality of transmitters as received through respective ones of the at least one interfering path or mechanism;

    a combiner configured to combine into a signal path of the first receiver the delayed, amplitude weighted, and phase changed replica of each of the at least one interfering signal transmitted by respective ones of the at least one transmitter of the plurality of transmitters from which interference is to be suppressed to subtract the at least one interfering signal from the first receiver'"'"'s signal path; and

    wherein the first receiver receives the transmitted digitally modulated radio signal reflected from objects in the environment without saturating the signal path of the first receiver due to the subtraction of the at least one interfering signal from the first receiver'"'"'s signal path.

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