一种改进的SmartAGC扩频干扰抑制技术

针对现有SmartAGC干扰抑制技术对噪声和杂波干扰处理能力不足，对强干扰信号检测跟踪不准的缺点，提出一种改进的SmartAGC技术。该技术在包络检波模块中，利用分段三次Hermite插值多项式拟合曲线法获取原始信号包络，其包络比用希尔伯特变换法得到的更加平滑，并通过包络滤波算法对信号进行修正，消除幅度噪声和杂波干扰带来的影响。仿真结果表明改进的SmartAGC技术用于直接序列扩频系统可以明显提高系统抗干扰的性能。

An Improved Smart AGC Interference Suppression Technology in Spectum Spreading

For the poor capacity in responding noise and clutter waveforms, the existing Smart AGC inter- ference suppression technology in spectrum spread couldn＇t exactly detect or track strong interference. In concerning these problems, an improved Smart AGC technology is proposed. In the module of envelope de- tection, a polynomial curve fitting method of piecewise cubic Hermite interpolation is used to get the origi- nal-signal envelope, and this envelope is much smoother than that by Hilbert transform method. Then the signal is modified by envelope filtering algorithm, and thus the impacts resulted from range noise and clut- ter waveforms are removed. Simulation result shows that DSSS in combined with improved Smart AGC can significantly improve anti-jamming performance of the system.