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Radar apparatus and method

  • US 5,293,168 A
  • Filed: 01/29/1993
  • Issued: 03/08/1994
  • Est. Priority Date: 03/06/1992
  • Status: Expired due to Fees
First Claim
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1. A method of determining the range of a radar signal reflecting object which method comprises the steps of generating a radar frequency carrier wave,(1) modulating said carrier wave with a first code having a first bit rate and a first code repetition rate,(2) modulating said carrier wave with a second code having a bit rate equal to and synchronous with said first code repetition rate,(3) transmitting said modulated carrier wave as a radar signal,(4) feeding a received echo to an analogue correlator whereto is also fed a delayed version of said first code,(5) and feeding an output of said analogue correlator via a down converter to a digital correlator for correlation therein with said second code,whereby a received echo correlated in said analogue correlator provides information as to a range cell wherein the reflecting object lies and correlation of the output of the analogue correlator in the digital correlator provides information as to a range band in which the range cell lies.

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