Title: Airborne telemetering radar having variable width range gates

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Claims: What is claimed is:

1. An airborne target acquisition and range tracking radar receiver, comprising:

an intermediate frequency amplifier, to the input of which return radar signals are applied;

a gain control unit of said amplifier;

echo suppressor means coupled to the output of said I.F. amplifier for suppressing a target echo from the return radar signal;

energy detector means having one input coupled to the output of said suppressor means for detecting the energy of an echo return radar signal other than a target echo;

range gate generating means generating first and second adjacent range gates as well as a third gate adjacent to one of said first and second gates and supplying said third gate to said detector means, said third gate having two possible widths of different magnitude;

means for selectively coupling one of said two widths of said third gate to a second input of said detector means;

first control means coupled to said automatic gain control unit for controlling the gain thereof;

second control means;

means coupling an output of said second control means to said range gate generating means for controlling the generation of said range gates; and

further means selectively coupling the output of said energy detector means to inputs of said first and second control means for selectively controlling the gain of said automatic gain control unit and the generation of said range gates as a function of the output of said energy detector means;

wherein said first control means includes means having inputs coupled to said further selective coupling means and to said range gate generating means and an output coupled to said gain control unit and providing at its output the signal of larger amplitude from between its two inputs, whereby the tracking of a target is discontinued when the energy in said third range gate is greater than that in said first and second range gates.

2. A radar receiver according to claim 1, further comprising means for connecting said second input of said energy detector to the output of said range-gate generator generating the third gate of smallest width when the two first range gates are locked onto a target after acquisition thereof.

3. A radar receiver according to claim 1, wherein the selective connection between said range-gate generator and said energy detector as well as the selective connection between the output of said energy detector and said gain control unit are controlled by switch control means connected to second comparator means having a first input representing the energy of an echo contained in said two first range gates and having a second input of preset value.

Other info:

Inventors: Collot, Gerard (Saint-Germain-en-Laye, FR)
Ferreol, Jean (Palaiseau, FR)

Application Number: 475026
Filing Date: 1974-05-31
Publication_date: 1976-06-08
Assignee: Societe Dite: Electronique Marcel Dassault (Paris, FR)
Primary Class(es): 342/97
Other Classes:
US Patent Ref:

3495245	Feb, 1970	Leyde	343/7.
3503068	Mar, 1970	Yamauchi	343/7.
3564547	Feb, 1971	Dent	343/7.
3648286	Mar, 1972	Schoneborn	343/7.

Other Refs:
Primary Examiner: Hubler, Malcolm F.
Assistant Examiner:
Attorney: Stevens, Davis, Miller & Mosher