Selective reception of carrier-free radar signals with large rel

Details Selective reception of carrier-free radar signals with large rel Selective reception of carrier-free radar signals with large rel

1991-02-13

1992-09-15

Hellner, Mark

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

Base band system

G01S 728

Patent

active

051481740

ABSTRACT:
A method for generating a sequence of short radar pulses and a method plus apparatus for detecting those same short pulses when backscattered, even though they are heavily distorted by a target and have additive noise and unwanted signals superimposed on them. The method applies to pulses of long or short duration, including durations of 1 nanoseconds (1 ns) or less. The pulses are transmitted without the fine structure marking of a sinusoidal wave carrier, but organized into a coarse structure that results from incorporating them within a highly unconventional type of character, wherein a plurality of positive-going and negative-going pulses are transmitted such that each pulse is spaced apart from its neighbors. Each pulse is short, so the return signal is highly distorted. The sequence of positive-going and negative-going pulses are organized into a pattern of non-contiguous pulses that constitute a new type of "character", which may be thought of as a "spaced-apart-character". This "spaced-apart-character" is organized into a large coarse structure marking, so that a) the total transmitted energy is large, b) a receiver can selectively distinguish the wanted return signal from noise and unwanted signals, and c) reflections from targets longer than L=.DELTA.tc/2 are rejected.

REFERENCES:
patent: 3686669 (1972-08-01), Toulis
patent: 4150375 (1979-04-01), Ross et al.
patent: 4907001 (1990-03-01), Harmuth

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