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Direct detection LiDAR system and method with frequency modulation (FM) transmitter and quadrature receiver

  • US 10,416,292 B2
  • Filed: 09/14/2016
  • Issued: 09/17/2019
  • Est. Priority Date: 05/24/2016
  • Status: Active Grant
First Claim
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1. A LiDAR system, comprising:

  • a signal generator for generating an output signal having a variable frequency;

    a modulation circuit for receiving the output signal from the signal generator and applying the output signal from the signal generator to an optical signal to generate an envelope-modulated optical signal having a frequency-modulated modulation envelope;

    optical transmission elements for transmitting the envelope-modulated optical signal into a region;

    optical receiving elements for receiving reflected optical signals from the region; and

    receive signal processing circuitry for receiving the reflected optical signals and using quadrature detection to process the reflected optical signals, wherein the receive signal processing circuitry includes phase shifting circuitry for splitting the output signal from the signal generator into a pair of split signals and applying a phase shift to one of the pair of split signals to generate a first LO signal and a second phase-shifted LO signal, the first LO signal and the second phase shifted LO signal being applied to respective second inputs of respective ones of the pair of I/O mixers.

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