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Second order motion compensator for high resolution radar

  • US 4,034,370 A
  • Filed: 04/06/1976
  • Issued: 07/05/1977
  • Est. Priority Date: 08/23/1972
  • Status: Expired due to Term
First Claim
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1. Method of providing motion compensation for target data in a synthetic aperture radar comprising the steps of:

  • sequentially transmitting and receiving a plurality of radar pulses during a coherent integration time period, said radar pulses having a predetermined interpulse period and providing analog signals therefrom;

    converting each analog signal into complex digital data samples corresponding to a predetermined number of respective range cells during said coherent integration time period;

    performing a first time correction and phase shift on each of said complex digital data samples thereby effecting a first order motion compensation thereon;

    sequentially entering said complex digital data samples into a memory in sets of digital data time samples for a selected number of interpulse periods;

    sequentially feeding each set of time samples as a data block into a digital correlator and performing a digital integration to resolve said data block into data reflective of a respective plurality of frequency bands which correspond to synthetic subbeams;

    performing a second time shift and phase correction on each data reflective of each synthetic subbeam thereby effecting a second order motion compensation thereon;

    sequentially feeding data samples for each plurality of synthetic subbeams into a memory in selected sets of range cells;

    feeding out data samples for each synthetic subbeam over a predetermined number of interpulse periods as a data block into another digital correlator and performing a digital integration to resolve each synthetic subbeam into data reflective of a respective plurality of frequency bands which correspond to motion compensated azimuth cells; and

    feeding data reflective of said motion compensated azimuth cells to synthetic aperture radar display apparatus.

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