为扩大信号采集处理接收机的动态范围,一般在A/D转换器前引入自动增益控制(Automatic Gain Control,AGC)系统.在实际工程中,信号采集之前打开AGC系统,会导致依赖信号功率抬升进行识别干扰起始位置的信号检测失败.针对该问题,简要说明了干扰抵消技术的处理流程.为进一步查找问题,阐述了 AGC电路设计与控制流程;通过分析,给出了引入AGC系统后对采集数据波形的影响.根据分析结果,调整了搜索干扰信号起始位置的算法,试验验证了实测数据与分析结果吻合,证明了调整后干扰抵消算法的有效性.
Analysis of the Influence of Automatic Gain Control System on Interference Cancellation Algorithm
To expand the dynamic range of signal acquisition and processing receivers,Automatic Gain Control(AGC)system is usually introduced before the analog-to-digital converter.In practical engineering,turning on the AGC system before signal acquisition will lead to signal detection failure that relies on signal power rise to identify the starting position of interference.In response of this problem,the processing flow of interference cancellation technology is briefly explained.For further investigation,the circuit design and control process of AGC system are introduced.Through analysis,the impact of introducing the AGC system on acquisition data waveform is given.Based on the analysis results,the algorithm for searching for the starting position of the interference signal is adjusted.Finally,the experimental results are verified to be consistent with the analysis results and the effectiveness of the adjusted interference cancellation algorithm is proved.
万方数据
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