摘要
传统方法对干涉相位谱解卷绕会产生误差积累,导致解卷绕的效果较差,针对该问题提出一种新的基于质量图引导与预测修正相结合的相位解卷绕算法。首先利用二阶相位差分值作为质量图依据,然后根据质量图的质量确定解卷绕的顺序,并在跳变较大的位置引入预测值进行修正,最终得到高精度无卷绕相位谱。仿真实验表明,在信噪比大于-10 dB条件下,所提算法得到的无卷绕相位谱相位误差相比传统解卷绕算法减小1个数量级以上,在时延估计中可将时延估计精度提高1倍以上。
Traditional method of unwrapping interference phase spectrum will cause error accumulation,resulting in poor unwrapping effect.To solve this problem,a new phase unwrapping algorithm based on combination of quality map guidance and prediction correction is proposed.The second-order phase difference value is used as the basis of the quality map.The unwinding order is determined according to the quality of the quality map.The predicted value is introduced at the position with larger jumps for correction.A high-precision unwound phase spectrum is obtained.The simulation experiments show that,compared with traditional unwrapping algorithm,the phase error of the unwrapped phase spectrum obtained by the algorithm is reduced by more than one order of magnitude.The delay estimation accuracy can be improved more than doubled.
作者
蓝漳福
彭华峰
赵培焱
LAN Zhangfu;PENG Huafeng;ZHAO Peiyan(College of Information System Engineering,Information Engineering University,Zhengzhou 450001,China;National Key Laboratory of Science and Technology on Blind Signal Processing,Chengdu 610041,China)
出处
《电子信息对抗技术》
北大核心
2022年第6期13-19,47,共8页
Electronic Information Warfare Technology
基金
盲信号处理重点实验室基金(6142413200206)。
关键词
无源定位
时延估计
互相位谱
解卷绕
质量图
passive localization
time delay estimation
cross-power spectrum phase
unwrapping algorithm
quality map
