Arrangement for detecting the presence of radar echos in a pulse

Details Arrangement for detecting the presence of radar echos in a pulse Arrangement for detecting the presence of radar echos in a pulse

1977-09-13

1979-02-13

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 171R, G01S 922

Patent

active

041398505

ABSTRACT:
The invention relates to arrangement for detecting the presence of echos for a multi-range-gate radar system.
The signal A from a gate is combined with a signal B from one or more neighboring gate. This combination is performed by means of an operator which supplies signals S.sub.1 = A + k.sub.1 B and S.sub.2 = k.sub.2 (A - k.sub.1 B), where k.sub.1 and k.sub.2 are complex coefficients. A demodulator receiving S.sub.1 and S.sub.2 supplies a signal proportional to the cosine of the phase between S.sub.1 and S.sub.2. Said cosine signal is sampled, filtered and compared to a threshold. When exceeding said threshold the output signal indicates that an echo signal is received.

REFERENCES:
patent: 3560974 (1971-02-01), Le Courtier et al.
patent: 3958242 (1976-05-01), Sirven
patent: 4064510 (1977-12-01), Chabah

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