一种基于信号特征统计的改进调频载波静噪算法

针对调频通信设备,文章提出了一种改进的静噪算法,改进算法提出了新的度量计算和新的判断逻辑。阐述了基于信号统计分析的静音/非静音阈值计算方法并给出仿真结果和硬件测试结果,结果证明:该算法在弱信号环境下能够比原始算法获得更好的性能。

基于统计特征的IQ不平衡高效校正算法

针对零中频接收机的IQ不平衡问题,提出了一种数字域的基于统计特征的盲估计IQ不平衡校正算法,该算法利用具有循环对称特性的信号的统计特征,直接估计出系统的不平衡参数,进而完成IQ不平衡校正,相比于传统的算法,本算法具有计算复杂度低,校正精度高且不容易受到加性噪声的干扰等优点。仿真结果表明,所提算法不仅可以准确估计零中频接收机的IQ不平衡参数,还能对IQ不平衡进行有效的校正,从而提高系统的镜像抑制比。

Statistical Characteristics of the Received Signal for Stochastic Surface Models

This paper describes the stochastic model of the scattered electromagnetic field.Unlike common_used functional_determined models the proposed is characterised by amplitude/phase fluctuation of the received signal.This paper derives the statistical characteristic of the input signal and describes algorithm for its estimation in post_processing and real_time processing modes.Achieved characteristics allow the mapping and estimation of the surface models more accurate,moreover,such processing increase space resolution of synthetic aperture radar.