Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-07-25
1978-07-11
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 16M, 343100LE, G01S 332, G01S 922
Patent
active
041005449
ABSTRACT:
A beacon receiver or IFF system in which the gain of the receiver is time varied to enhance the discrimination between response from transponders located ahead of the interrogator as compared with the responses from transponders in the side or rear lobe regions of the interrogator antenna pattern. The system is employed with a directional antenna and signal processing apparatus giving sum .SIGMA. and difference .DELTA. channels. In accordance with this invention, the gain of the receiver in the sum .SIGMA. channel is increased from the minimum value to a maximum value beginning after the end of interrogation pulse. The difference .DELTA. channel is varied in gain from the time in the beginning after the end of the interrogator pulse but the gain is varied inversely from the maximum level at the beginning of reception to a maximum level at the end of reception.
REFERENCES:
patent: 2026254 (1935-12-01), Sandfort
patent: 3942181 (1976-03-01), Berrod et al.
patent: 4023172 (1977-05-01), Schmidt
Berger Richard E.
General Dynamics Corporation
Johnson Edward B.
Wagner John E.
Wilbur Maynard R.
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