| 引用本文: | 刘巧玲,李超,庞晨,等.系统频率偏差对同时全极化测量的影响及其校准.[J].国防科技大学学报,2019,41(1):115-122.[点击复制] |
| LIU Qiaoling,LI Chao,PANG Chen,et al.Influence of frequency deviation on simultaneous polarization measurement and its calibration[J].Journal of National University of Defense Technology,2019,41(1):115-122[点击复制] |
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| 系统频率偏差对同时全极化测量的影响及其校准 |
| 刘巧玲, 李超, 庞晨, 李永祯, 王雪松 |
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(国防科技大学 电子信息系统复杂电磁环境效应国家重点实验室， 湖南 长沙410073)
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| 摘要: |
| 目标极化散射矩阵的精确测量是全极化雷达极化信息处理的前提和基础。基于正负线性调频信号，针对采用数字解线性调频处理的同时全极化测量体制雷达，分别推导了雷达中频频率偏差和采样频率偏差对同时全极化测量影响的数学模型，提出一种雷达中频频偏和采样频偏的联合估计与校准方法。仿真和实测数据表明：雷达系统频率稳定度会引起不同通道极化测量结果峰值位置和相对相位的变化，采用所提方法能够有效校正峰值偏移，补偿相位误差，提高目标极化散射矩阵测量的精度。 |
| 关键词: 全极化雷达 中频频率偏差 采样频率偏差 数字解线性调频 极化散射矩阵 |
| DOI：10.11887/j.cn.201901017 |
| 投稿日期：2017-10-30 |
| 基金项目:国家自然科学基金资助项目（61490694,61701512） |
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| Influence of frequency deviation on simultaneous polarization measurement and its calibration |
| LIU Qiaoling, LI Chao, PANG Chen, LI Yongzhen, WANG Xuesong |
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(State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| It is now a basic premise to acquire the polarization scattering matrix of radar target accurately before the polarization information processing. Based on a pair of linear frequency modulation signals with opposite slopes and aimed at the simultaneous polarimetric radar adopting the digital dechirp processing, the mathematical model of the influence of the intermediate frequency deviation and sampling frequency deviation on simultaneous polarization measurement was derived. An intermediate frequency deviation and sampling frequency deviation joint estimation and calibration algorithm was proposed. Simulation and real data results show that the radar frequency stability can change the peak position and phase of the simultaneous polarization scattering matrix measurement. The approach proposed can regulate the peak deviation effectively, compensate the phase error and accurately acquire the four elements of polarization scattering matrix. |
| Keywords: full polarimetric radar intermediate frequency offset sampling frequency offset digital dechirp polarization scattering matrix |
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