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针对现有Smart AGC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Smart AGC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Smart AGC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。
In view of the shortcomings of the existing Smart AGC interference suppression technology, such as insufficient processing power of noise and clutter interference and imperfect detection of strong interference signal, an improved Smart AGC technology is proposed. The envelope detection module in the technology, the use of sub-cubic Hermite interpolation polynomial curve fitting method to obtain the original signal envelope, the envelope than the Hilbert transform obtained more smooth, and by envelope filtering algorithm for signal Correct, eliminate the impact of amplitude noise and clutter interference. The simulation results show that the improved Smart AGC technology can improve the system anti-jamming performance obviously when used in direct sequence spread spectrum system.