移动通信信号宽带侦察接收机自动增益控制方法研究

Method of AGC of wideband reconnaissance receiver over mobile communication signal

宽带侦察接收机具备搜索时间短、截获概率高的特点,是实现移动通信信号管控的关键.为此分析了一种移动通信信号宽带侦察接收机自动增益控制方案.该技术通过模拟增益和数字增益联合控制,实现了利用宽带接收前端接收窄带信号时的恒包络控制,在移动通信电磁频谱监视、管控领域有广泛的应用前景.同时,以900MHz GSM系统为例,给出了不同输入信号功率下的增益控制值和对应的最大瞬时动态范围,分析了影响系统灵敏度和瞬时动态的关键因素,为移动通信信号宽带侦察接收机的工程合理运用提供参考.

A wideband reconnaissance receiver has the features of short search time and high probability ofinterception, which plays a key role in monitoring and controlling the mobile communication signals. This paperanalyzes a scheme of automatic gain control （AGC） of wideband reconnaissance receiver over mobilecommunication signal. This proposed scheme implements the constant envelope control of narrowband signalsreceived by wideband receiving front-end, by means of the united control of analog and digital gains, which has abroad applicable prospect in monitoring and controlling of the EM spectrum in the field of mobilecommunication. Meanwhile, by taking the GSM of 900MHz, it gives also the gain control values and thecorresponding maximum of instantaneous dynamic range under various input signal powers and analyzes the keyfactors that affect the sensitivity and instantaneous dynamic of the system, thus offering a reference for thereasonable engineering application of wideband reconnaissance receiver over mobile communication signal.