系统工程与电子技术 ›› 2020, Vol. 42 ›› Issue (2): 263-270.doi: 10.3969/j.issn.1001-506X.2020.02.02

• 电子技术 • 上一篇    下一篇

基于模糊函数构型的动目标探测波形设计

赵宜楠(), 宋群(), 冯翔(), 吴中杰(), 赵占锋()   

  1. 哈尔滨工业大学(威海)信息科学与工程学院, 山东 威海 264209
  • 收稿日期:2019-04-04 出版日期:2020-02-01 发布日期:2020-01-23
  • 作者简介:赵宜楠 (1977-),男,教授,博士,主要研究方向为无线定位与感知、智能感知技术。E-mail:zhaoyinan@hit.edu.cn|宋群 (1995-),男,博士研究生,主要研究方向为智能雷达信号处理。E-mail:psuvtk@126.com|冯翔 (1988-),男,讲师,博士,主要研究方向为认知雷达信号处理、智能感知技术。E-mail:fengxiang230316@163.com|吴中杰 (1990-),男,讲师,博士,主要研究方向为认知雷达信号处理、智能感知技术。E-mail:hit_wzj@163.com|赵占锋 (1980-),男,副教授,博士,主要研究方向为信号处理、信号检测理论。E-mail:56044075@qq.com
  • 基金资助:
    国家自然科学基金(61771160);国防科技创新特区项目;山东省科技重大专项(2015ZDZX08002)

Waveform design based on ambiguity function formulation for moving target detection

Yinan ZHAO(), Qun SONG(), Xiang FENG(), Zhongjie WU(), Zhanfeng ZHAO()   

  1. School of Information and Engineering, Harbin Institute of Technology, Weihai 264209, China
  • Received:2019-04-04 Online:2020-02-01 Published:2020-01-23
  • Supported by:
    国家自然科学基金(61771160);国防科技创新特区项目;山东省科技重大专项(2015ZDZX08002)

摘要:

针对工程中常规雷达波形存在距离旁瓣高、抗截获性差、多普勒容许性差等问题,本文借鉴噪声波形与线性调频(linear frequency modulation, LFM)波形联合思路来探测非合作动目标,即约束波形恒模条件下,利用相位尺度因子来考虑LFM波形与噪声波形的相位部分,构造恒模化的LFM-噪声复合波形;进而在模糊函数图及主优化算法(majorization-minimization, MM)体制下利用先验知识映射模板实现对特定距离-多普勒区间的波形优化,将该二维旁瓣抑制问题分步转化为多维求解问题,通过选取两次逼近函数来逼近原优化问题的解域,并在算法的每一次迭代中加入级联松弛-缩放步骤、相位校正步骤,使之加快算法迭代收敛效率,获得波形兼具低旁瓣、低截获及多普勒容许性。仿真表明:所提基于相位修正的松弛加权MM复合波形设计算法收敛迅速,相比常规算法具有明显的性能优势。

关键词: 模糊函数, 动目标探测, 低旁瓣, 低截获, 多普勒容许

Abstract:

Aiming at traditional waveforms with poor Doppler tolerance, a low anti-interception ability and high range sidelobes for detecting some non-cooperative moving target, the idea of noise-linear frequency modulation (LFM) combined waveform is resorted and their phase sections are connected by utilizing a phase scalar factor. Then the fuzzy function map and majorization-minimization (MM) framework are introduced, and further a two-dimensional mapping template is used to optimize some range-Doppler interval. Therefore, the range-Doppler sidelobe suppression has been a multi-dimensional mathematical problem, the two-dimensional range-Doppler sidelobe suppression problem can be transformed into a high dimensional mathematics problem, by choosing two agency functions to approximate the solution domain of the original problem. The algorithm with cascade relaxation -zoom steps and phase correction, in each iteration, could speed up the optimization convergence. Simulations show that compared with several traditional algorithms, the phase-modified relaxed-scalar-weighted MM algorithm could achieve better convergence.

Key words: ambiguity function, moving target detection, low range sidelobes, low probability of interception, Doppler tolerance

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