| 摘要: |
| 双基雷达的实际飞行状态不可避免地会产生速度误差，降低成像质量，影响检测性能。本文基于平飞斜侧视模型对速度误差进行了研究和分析，并给出了速度误差限制条件的解析表达式。具体来讲，首先建立了平飞斜侧视模式下的双基雷达模型，在数学上给出了运动方程表达式；然后导出了收发平台分别沿着理想航线方向、俯仰方向和偏航方向存在误差时的等效距离历史和；在此基础上，通过将速度误差转化为时延走动误差和多普勒相位误差，进而推导出了速度误差的限定范围，为工程设计和实现提供了相关依据和参考。通过仿真验证表明相比于理想航线方向和偏航方向，俯仰方向的速度误差对补偿精度的要求更高，其限制条件也更苛刻。 |
| 关键词: 双基斜侧视雷达 速度误差 限制条件 时延走动 多普勒相位 |
| DOI：DOI:10.3969/j.issn.1672-2337.2022.03.015 |
| 分类号:TN958 |
| 基金项目: |
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| Error Analysis of Bistatic Squint Side-Looking Radar with Parallel Track |
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LIN Lanjin, HE Zishu
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School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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| Abstract: |
| The actual flight state of the bistatic squint side-looking radar inevitably produces velocity errors, which will reduce the imaging quality and affect the detection performance. In this paper, the velocity errors are studied and analyzed based on the model of bistatic squint side-looking radar with parallel track and the analytical expressions of the velocity error restrictive conditions are given. Firstly, the general model of bistatic side-looking radar with equal velocity vectors and parallel flight paths of transmitter and receiver is described. Then, the equivalent range histories of the transmitter and receiver are derived with the existing of velocity errors along the ideal flight line direction, the pitch direction, and the yaw direction, respectively. On this basis, by transforming the velocity errors into time delay migration errors and Doppler phase errors, and the restrictive conditions of velocity errors are deduced. The restrictive conditions provide relevant basis and reference for engineering design and implementation. The simulation results show that the velocity errors along the pitch direction requires higher compensation accuracy and the restriction condition of the velocity errors are more severe than those along the ideal flight line direction and the yaw direction. |
| Key words: bistatic squint side-looking radar velocity error restrictive condition time delay migration Doppler phase |
