| 编队卫星雷达正交码分LFM信号设计及性能分析 |
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| 引用本文： | 宗竹林,胡剑浩,朱立东.编队卫星雷达正交码分LFM信号设计及性能分析[J].电子科技大学学报（自然科学版）,2012,41(4):501-506. |
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| 作者姓名： | 宗竹林 胡剑浩 朱立东 |
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| 作者单位： | 1.电子科技大学通信抗干扰技术国家级重点实验室 成都 610054; |
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| 基金项目： | 国家自然科学基金(60971081) |
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| 摘 要： | 结合LFM信号和CDMA技术,提出了一种正交码分线性调频(OCD-LFM)信号,研究了该信号的模糊函数、正交性以及距离分辨等方面的性能;讨论了降低互相关峰值和减小多普勒失配的信号参数设计要求。计算机仿真和理论分析表明OCD-LFM信号随着码元数N的增加,正交性能逐步增强。与传统LFM+二相编码信号相比,该信号在距离分辨和多普勒容限等方面均表现出较好的性能。
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| 关 键 词： | 模糊函数 编队卫星 线性调频信号 正交码分 |
| 收稿时间： | 2010-11-04 |
OCD-LFM Signal Design and Performance Analysis for Formation-Flying Satellite Radar |
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| Affiliation: | 1.National Key Laboratory of Science and Technology on Communication,University of Electronic Science and Technology of China Chengdu 610054;2.Research Institute of Electronic Science and Technology,University of Electronic Science and Technology of China Chengdu 610054 |
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| Abstract: | Formation-flying satellite radar is a new technique developed recently. It offers the potential for diversity gain and spatial resolution gain through transmitting the orthogonal waveforms. Combining the performance of LFM signal with the orthogonal code division technology, OCD-LFM (orthogonal code division linear frequency modulation) signals is proposed. Then, the cross-ambiguity and the range resolution on the performance of the designed signals are analyzed. Also, the relationship between the parameters that minimize the cross-correlation peaks and minimize the effect of Doppler frequency shift of the proposed signals is derived. Theoretical analysis and computer simulation results illustrate that the orthogonal performance of OCD-LFM signals gradually enhanced with the increase of phase code length N, while the proposed signal has better performance than the traditional hybrid waveform obtained by combining chirp waveform with binary pseudo-random sequences in range resolution and Doppler tolerance. |
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