Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-08-27
1983-01-04
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343100LE, H04B 110, G01S 702
Patent
active
043674720
ABSTRACT:
A circuit arrangement for side lobe suppression in radar wherein the undesired signals which arrive at the radar receiver by way of the side lobes of the antenna are cancelled by using a compensation circuit formed as a loop. Additional circuit means for the formation of a weighting factor for the weighting multiplier are provided in the feedback of the loop between a correlator and a weighting amplifier.
When the noise power at the output of the compensating circuit is greater than the noise power that the radar receiver supplies without the compensation circuit, the output will be switched from the compensation circuit to a direct output of the radar receiver. The comparison of the noise power in a comparator then supplies the control signal for the change-over. The change-over can also occur as a function of thermal noises when the amount of the weighting factor exceeds a predetermined value. The weighting factor is monitored by a control circuit. So as to make the response behaviour of the compensated loop independent of the noise signal power, a controlled amplifier is incorporated in the control circuit with the gain of the amplifier being inversely proportional to the square of the noise amplitude in the auxiliary channel. The controlled amplifier can be mounted in the feedback branch between the correlator and the weighting multiplier or can be inserted in front of one of the two inputs of the correlator.
REFERENCES:
patent: 3881177 (1975-04-01), Len et al.
patent: 4162497 (1979-07-01), Hulland et al.
patent: 4286268 (1981-08-01), Daniel et al.
Military Microwave Conference, London 1978, pp. 366-377, entitled "Adaptive Arrays and Sidelobe Cancellers for Communications and Radar Applications" by D. Hicks and G. Raymond.
Foeller Gerhard
Hauptmann Rudolf
Siemens Aktiengesellschaft
Tubbesing T. H.
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