Dual frequency radar receiver

Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver

Patent

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Details

455315, 343 55A, H04B 1700, H04B 126

Patent

active

043132162

ABSTRACT:
A radar receiver for detecting quasi-harmonically related radar signals includes an antenna system (10) having a mixer (15) included therein. One harmonic from a local oscillator (20) mixes with a signal at a first frequency to produce an intermediate frequency, and another harmonic of the local oscillator mixes with an input signal at a second frequency also to produce an intermediate frequency. A second mixer (30) and local oscillator (40) may be provided. A bandwidth limited signal detecting system preferably includes a band pass filter (50), a limiting IF amplifier (55) and a frequency discriminator (60). The frequency of either the first or second local oscillator is repeatedly varied by a sweep generator (35) to insure that the presence of a radar signal will pass through the band pass filter (50) and be detected. A low pass filter (65) reduces the noise component output of the discriminator, and a comparator (70) provides output pulses whenever a radar signal within either of the quasi-harmonically related frequency ranges is detected. Radar signals at the two frequencies can be distinguished from each other by the time between the pulses generated as detected by a circuit including a one-shot (110), a counter (120), a clock (115), gates (125, 130, 135, 140), and indicators (145, 150).

REFERENCES:
patent: 2502294 (1950-03-01), Wallace
patent: 3649919 (1972-03-01), Fridman et al.
patent: 3701949 (1972-10-01), Turkish
patent: 3745465 (1973-03-01), Stover
patent: 3932814 (1976-01-01), Niki
patent: 3992670 (1976-11-01), Gittins et al.
patent: 4001695 (1977-01-01), Hrbacek et al.
patent: 4009442 (1977-02-01), Von Bromssen

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