STEADY-STATE AND TRANSIENT PERFORMANCE OF THE SIDELOBE CANCELLER
SYRACUSE UNIV RESEARCH CORP NY SPECIAL PROJECTS LAB
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The purpose of this study was to determine the factors and trade-offs that limit the speed of response lock-on rate of the Sidelobe Canceller. The Sidelobe Canceller consists of a correlator, multiplier and integrator, within a closed loop circuit. The lock-on rate is essentially determined by the bandwidth of the integrating circuit, the loop gain, and the bandwidth of the input jammer waveform. The performance of the Sidelobe Canceller, both transient and steady-state can be related to two parameters, the loop gain and the ratio of the enhanced loop bandwidth to the jammer bandwidth, B sub J. The enhanced loop bandwidth, B sub E, is defined as 1 loop gain times the bandwidth of the integrating circuit. The lock-on rate can be increased by increasing loop gain andor the enhanced bandwidth. The loop gain is limited by stability requirements to 30-40 db. The enhanced bandwidth cant be increased much beyond the point where the ratio B sub EB sub J exceeds unity without hurting the steady-state performance.
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