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分析了采用视频AGC(自动增益控制)、射频AGC和限幅器等3种测距转发模式的应答机性能,分析结果表明:视频AGC模式下,应答机测距通道的输出功率恒定,测距转发性能不随上行信号强度变化而变化;射频AGC模式下,应答机测距通道的输出功率不恒定,测距转发性能随着上行信号强度变化而变化;而限幅器模式可看作射频AGC的一种特殊情况。仿真分析了我国研制的限幅器和射频AGC两种模式应答机的性能,结果表明理论计算的性能与实测结果一致,理论分析正确且理论分析结果可作为链路计算的依据。
The performance of the transponder using three kinds of ranging and forwarding modes: video AGC (automatic gain control), RF AGC and amplitude limiter is analyzed. The analysis results show that the output power of the transponder ranging channel is constant and the ranging Forwarding performance does not change with the uplink signal strength changes; RF AGC mode, the answering machine ranging channel output power is not constant, ranging performance with uplink signal strength changes; and limiter mode can be seen as RF AGC A special case. The performance of the two mode transponders with limiter and RF AGC developed in China is simulated and analyzed. The results show that the performance of the theoretical calculation is consistent with the measured results. The theoretical analysis is correct and the theoretical analysis results can be used as the basis for link calculation.