| 摘要 |
An automatic gain control (AGC) system ( 100 ) for a controlled gain receiver ( 1101 ) includes a magnitude generator ( 160 ) and a gain corrector ( 170 ). The magnitude generator ( 160 ) generates a binary voltage squared signal ( 165 ) having a binary value that is directly proportional to a recovered signal power of an intercepted signal ( 113 ). The gain corrector ( 170 ) determines an adjustment of a gain control value ( 195 ) as a multiple of increments that are approximately 3 decibel (dB), by shifting ( 475, 445 ) a reference threshold by one or more bits and comparing ( 485, 455 ) the shifted reference threshold to the binary voltage squared signal. An initial setting of a state of a step attenuator ( 114 ) during a track mode ( 172 ) is determined during a warm up mode ( 171 ) by comparing the binary voltage squared signal ( 165 ) to two different thresholds ( 245, 255 ). A filter ( 162 ) accommodates a variety of bandwidths and symbol rates by settings of an accumulator ( 505 ) and scaler ( 510 ) that are included in the filter ( 162 ). A received signal strength indicator function ( 182 ) of the controlled gain receiver ( 1101 ) generates a low resolution or high resolution RSSI signal ( 183 ), depending on the mode. The value of the low resolution RSSI signal ( 183 ) is directly proportional to the power of the intercepted signal ( 113 ). |
