7. Coherent Train of LFM Pulses

  1. Nadav Levanon and
  2. Eli Mozeson

Published Online: 18 AUG 2004

DOI: 10.1002/0471663085.ch7

Radar Signals

Radar Signals

How to Cite

Levanon, N. and Mozeson, E. (2004) Coherent Train of LFM Pulses, in Radar Signals, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471663085.ch7

Publication History

  1. Published Online: 18 AUG 2004
  2. Published Print: 9 JUL 2004

ISBN Information

Print ISBN: 9780471473787

Online ISBN: 9780471663089

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Keywords:

  • radar;
  • pulse compression;
  • Doppler resolution;
  • time–bandwidth;
  • Doppler shift;
  • interpulse weighting;
  • intrapulse weighting;
  • weighting on-receive;
  • mismatched filter;
  • delay–Doppler response

Summary

A train of identical linear-FM pulses provides both range resolution and Doppler resolution, hence its importance and popularity in radar systems. Its ambiguity function still suffers from significant sidelobes, both in delay and Doppler. Thus, modifications are usually applied to reduce these sidelobes.

The chapter starts by considering the basic signal without modifications.

The 2nd section demonstrates simple implementation (using FFT) of filters matched to higher Doppler shifts.

The 3rd and 4th sections describe Doppler sidelobes reduction using interpulse weighting, and range sidelobes reduction using intrapulse weighting.

Section 5 presents analytic results of the delay–Doppler response in the presence of both interpulse and intrapulse weighting.