Unambiguous doppler radar

Details Unambiguous doppler radar Unambiguous doppler radar

1980-04-28

1982-05-04

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 1328

Patent

active

043284957

ABSTRACT:
A digital pulse compression radar system with interrupted, phase coded, high duty ratio transmissions which allow contiguous range resolution cells to be established in coverage space and provide adequate airframe impulse excitation recovery time to render high duty ratio, phase coded, radar feasible for airborne applications.
Each pulse is subdivided into a predetermined number of subpulses or bits, which are phase coded with (in-phase or out-of-phase) reference to a master oscillator. In the preferred embodiment, the code is built up from a PRN code staggered over .sup.2 n-1 pulses, each containing m resolution elements, where n is an arbitrary number designating the degree of the code and where m is an arbitrary number or is equal to the number of bits per pulse. The correlation properties of the code are such that when all bits of the returned pulses representing a word align with the delayed transmitted word, all bits add. When the bits do not align precisely, the bits generally cancel each other. Because of this, partial pulse overlaps do not produce a noticeable effect and ambiguity of the range is no longer limited by the time separation of adjacent pulses.

REFERENCES:
patent: 4110755 (1978-08-01), Zottl
patent: 4142189 (1979-02-01), Gleason
patent: 4143373 (1979-03-01), Chernick
patent: 4167737 (1979-09-01), Freedman
patent: 4241347 (1980-12-01), Albanese et al.

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