基于DSP的干涉仪测向多级数据处理方法  

Multi-level Data Processing Method for Interferometer Direction Finding Based on DSP

作　　者：文彩虹 沈鹏飞 王先发[1] 陈欣 郭林楠 幸涛 WEN Caihong;SHEN Pengfei;WANG Xianfa;CHEN Xin;GUO Linnan;XING Tao(The 27th Research Institute of CETC,Zhengzhou 450047,China;Unit 93160 of the PLA,Zhengzhou 450050,China)

机构地区：[1]中国电子科技集团公司第27研究所,郑州450047 [2]中国人民解放军93160部队,郑州450050

出　　处：《计算机测量与控制》2025年第3期219-225,234,共8页Computer Measurement &Control

摘　　要：针对多基线干涉仪测向系统存在测量噪声、系统误差等导致的解模糊错误和测向精度低等问题,提出了一种有效提高测向精度的多级数据处理方法;该方法选用了抗干扰能力强、复杂度适中、易于工程实现的立体基线法,并着重于解模糊前后的数据处理;针对解模糊过程中基线间相位差数据相互关联、相互影响的数据特点,选用了中值滤波算法,以达到既有效滤除噪声,又尽可能保留数据原本信息的目的,从而有效提高解模糊正确率和测向精度;为提高测向数据可靠性,测向解算后再次对数据进行了异常值剔除;设计FPGA+DSP硬件平台,基于DSP芯片TMS320C6713完成该多级数据处理方法的工程实现;实测数据表明,在最长基线仅为约10个波长的小型化天线阵条件下,输入相位差数据均方根误差(RMSE)为3.4°时,解模糊正确,且测角均方根误差控制在0.1°,数据处理速率达到100 Hz;该测向数据处理方法有效提高了解模糊正确率,处理速度快、测向精度高、工程实用性强。To address issues such as ambiguity resolution errors and low direction finding accuracy caused by measurement noise and system errors,and effectively improve the direction finding accuracy of a multi baseline interferometer direction finding system,a multi-level data processing method is proposed.This method adopts the spatial baseline method with strong anti-interference ability,moderate complexity,and easy engineering implementation,and focuses on data processing before and after resolving ambiguity.In response to the mutual correlation and influence of phase difference data between baselines in the process of resolving ambiguity,the median filtering algorithm is selected to effectively filter out noise while preserving the original information of the data as much as possible,thereby effectively improving the accuracy of ambiguity resolution and direction finding.To improve the reliability of direction finding data,abnormal data are removed from the data again after direction finding calculation.Design FPGA+DSP hardware platform and achieve the multi-level data processing method based on DSP chip TMS320C6713.The test data show that under the conditions of a miniaturized antenna array with a longest baseline of only about 10 wavelengths and a root mean squared error(RMSE)of 3.4°for the input phase difference data,the ambiguity resolution is correct,the RMSE of the angle measurement can be controlled within 0.1°,and the data processing speed can reach up to 100 Hz.This direction finding data processing method effectively improves the accuracy of ambiguity resolution,with fast processing speed,high direction finding accuracy,and strong engineering practicality.

关 键 词：干涉仪 测向 解模糊 中值滤波 异常值剔除 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置] TN971.1[自动化与计算机技术—控制科学与工程]