Radar apparatus and method

Details Radar apparatus and method Radar apparatus and method

1993-01-29

1994-03-08

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

With correlation

342189, 342130, 342136, G01S 1328, G01S 1338

Patent

active

052931684

ABSTRACT:
The invention provides a method of determining the range of a radar signal reflecting object by utilizing a radar frequency carrier wave modulated by a first short code having a first repetition rate and a second code having a bit rate equal to the first code repetition rate. A received echo is first passed to an analogue correlator for correlation against a delayed version of the first code, and the output of the analogue correlator is fed to a digital correlator for correlation therein against the second code. In this way, the high bandwidth (greater range resolution) of analogue correlation can be combined with the lower bandwidth (longer ambiguity function) of digital correlation to provide high resolution target detection without ambiguity and at a fast rate without the need for a very large number of correlators.

REFERENCES:
patent: 3555258 (1971-01-01), Berthier et al.
patent: 3796868 (1974-03-01), Kaul et al.
patent: 3829860 (1974-08-01), Cutler et al.
patent: 4234883 (1980-11-01), Kaelin et al.
patent: 4278978 (1981-07-01), Easterling et al.
patent: 4293856 (1981-10-01), Chressanthis et al.
patent: 4813006 (1989-03-01), Burns et al.

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