Compagnie Generale De Telegraphie Sans Fil

Compagnie Generale De Telegraphie

Paul Josse

Yves Brault

1. A variable frequency pulse radar system comprising:

Random frequency radar system

1. A random frequency radar system comprising: a normally blocked transmitting channel including a radio frequency oscillator; a receiving channel including a mixer and a local oscillator feeding said mixer; means for selecting a random pair of associated frequencies F.sub.p and F.sub.l differing by a fixed value; means for tuning said radio frequency oscillator and said local oscillator respectively on said selected frequencies F.sub.p and F.sub.l ; a normally blocked auxiliary channel connected in parallel with said receiving channel at a point thereof beyond said mixer, said auxiliary channel having an output and including a threshold device for translating to said output only signals above a predetermined level; first means for temporarily unblocking said auxiliary channel, and second means connected to said auxiliary channel output for blocking and unblocking the normal operation of said radar system at said selected pair of associated frequencies and a timing circuit for successively making operative said selecting means, said first means, and said second means.

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Paris, France

Paul Josse