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Digital frequency modulated continuous wave radar using handcrafted constant envelope modulation

  • US 9,945,935 B2
  • Filed: 04/20/2017
  • Issued: 04/17/2018
  • 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:

  • at least one transmitter configured for installation and use on a vehicle;

    wherein each of the at least one transmitter comprises;

    a frequency generator configured to generate a radio signal with a desired center frequency;

    a code generator configured to generate a sequence of chips at a selected chiprate, wherein a modulation interval between successive chips is a reciprocal of the chiprate, and wherein the generated sequence of chips is a selected sequence of chips selected from a plurality of chip sequences;

    a modulator configured to frequency modulate the radio signal using shaped frequency pulses, wherein the shaped frequency pulses correspond to a first signal, the frequency of which deviates from the desired center frequency during each of the modulation intervals according to a selected pulse shape, wherein the selected pulse shape is determined by the selected sequence of chips generated by the code generator, and wherein the selected sequence of chips is selected to realize the selected pulse shape;

    a constant-envelope power amplifier configured to amplify the frequency modulated radio signal at a desired transmit power level; and

    an antenna for transmitting an amplified and frequency modulated radio signal; and

    at least one receiver configured for installation and use on the vehicle, and configured to receive a radio signal that is the transmitted amplified and frequency modulated radio signal reflected from objects in the environment.

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