一种数字信道化自相关接收机的测频校正方法  

A frequency measurement correction method for digital channelized autocorrelation receivers

作　　者：李琳 苏生 王林 LI Lin;SU Sheng;WANG Lin(The 723 Research Institute of CSSC,Yangzhou 225000,China)

机构地区：[1]中国船舶集团有限公司第七二三研究所,江苏扬州225000

出　　处：《舰船科学技术》2023年第17期145-148,共4页Ship Science and Technology

摘　　要：本文提出一种测频校正方法,该方法针对由50%数据重叠的短时傅里叶变换(STFT)实现、子信道数据采用自相关积累进行处理的数字信道化接收机,分析了子信道自相关使用单点延迟的必要性,研究了噪声数据的相关性对相位的影响,并利用噪声功率对相位测量值进行校正。使用校正后的相位计算信号频率,频率测量均值误差和均方根误差均减少。尤其在信噪比较低时,该方法能明显提高测频精度。仿真验证了该方法的有效性,且单个子信道只消耗一次加法运算,能够保证实时性。A frequency measurement correction method was proposed,which is targeted at digital channelized receivers implemented by the short-time Fourier transform with 50%data overlap and sub-channel data accumulated using autocorrelation,analyzed the necessity of sub-channel autocorrelation using single-point delay,studied the effect of correlation of noise data on phase,and corrected the phase mesurements using noise power.Using the corrected phase to calculate the signal frequency,the mean error and root-mean-square error are reduced.Especially at low signal-to-noise ratios,this method significantly improves the frequency measurement accuracy.Simulation verified the effectiveness of this method.And only one addition operation is consumed fo a single sub-channel,which can guarantee the real-time performance.

关 键 词：短时傅里叶变换 自相关 频率测量 

分 类 号：TN957[电子电信—信号与信息处理]