A ranging method of hybrid modulation fuze based on instant correlation frequency domain detection
-
摘要:
为了实现混沌调相与线性调频复合调制无线电引信对不同散射特性的地面目标的精确定距功能，提出一种基于瞬时相关频域检测的复合调制引信定距方法。在时域瞬时相关处理之前，对本地预设混沌码与目标回波信号以码元宽度为采样周期进行同步采样；为减小目标回波幅值对定距方法的影响，以二维快速傅里叶变换（2D-FFT）提取目标的距离、速度信息，以相关窗位置、谐波包络主瓣位置、稳定的多普勒频率3个特征量作为定距依据，从频域角度进行精确定距。仿真结果表明：所提方法的判定结果只与目标信号信噪比有关，而与信号幅值具体大小无关；所提方法可在-28 dB的极低信噪比条件下实现复合调制引信对不同散射特性地面目标的精确定距功能。
-
关键词:
- 无线电引信 /
- 复合调制 /
- 定距方法 /
- 瞬时相关 /
- 二维快速傅里叶变换(2D-FFT)
Abstract:For the radio fuze combining chaotic code bi-phase modulation with linear frequency modulation, a ranging method based on instant correlation frequency domain detection is proposed to achieve precise ranging for the ground targets with different scattering characteristics. Before instant correlation in time domain, the local chaotic code and the target echo signal are sampled synchronously with code width as sampling period; to reduce the influence of the target echo signal amplitude on ranging method, target distance and speed information are extracted by Two-Dimensional Fast Fourier Transform (2D-FFT), three feature quantities of the instant correlation window position, harmonic envelope main lobe position and stable Doppler frequency are used as the ranging basis, and precise ranging is achieved in frequency domain. Simulation results show that the judgement results of ranging method are only related to the signal-to-noise ratio of the target signal, regardless of the magnitude of the signal amplitude, and it can achieve precise ranging of the hybrid modulation radio fuze for the ground targets with different scattering characteristics in the circumstance of a very low signal-to-noise ratio -28 dB.
-
图 1 混沌调相与线性调频复合引信工作原理
Figure 1. Working principle of hybrid modulation fuze combining chaotic code bi-phase modulation with linear frequency modulation
图 3 不同目标回波延迟下瞬时相关混沌码频谱
Figure 3. Spectrums of instant correlation chaos code under different target echo delays
图 4 相关窗内外瞬时相关差频信号频谱
Figure 4. Spectrums of instant correlation beat signal inside/outside correlation window
图 5 复合引信谐波幅值、多普勒频率与距离的关系
Figure 5. Relationship between harmonic amplitude & Doppler frequency and range for hybrid modulation fuze
图 6 不同地面散射系数下多普勒频率及目标判定结果
Figure 6. Doppler frequency and target judgment results under different ground scattering coefficients
图 7 不同地面散射系数下判定距离箱线图
Figure 7. Box-plot of judging ranges under different ground scattering coefficients
图 8 不同信噪比下判定距离箱线图
Figure 8. Box-plot of judging ranges under different signal-to-noise ratios
表 1 复合引信仿真参数取值
Table 1. Simulation parameter values of hybrid modulation fuze
参数 数值 载波频率f0/GHz 3 差频信号采样率fs/MHz 20 弹目径向运动速率Vr/(m·s－1) 500 目标多普勒频率fd/kHz 10 调制频率fm/kHz 100 调制频偏Δ F/MHz 100 混沌码码元宽度Tc/ns 50 预定炸高R0/m 6 
下载: 导出CSV
表 2 定距方法参数取值
Table 2. Parameter values of ranging method
参数 数值 谐波次数k 16 谐波包络主瓣范围Rp/m (5.25, 6.75) 系统附加延迟τsc/ns 5 本地预设延迟τ0/ns 40 距离维FFT每帧数据点数NT1 200 速度维FFT每帧数据点数NT2 100 速度维FFT帧间更新点数ND2 5 判定点数NL 25
下载: 导出CSV
表 3 不同信噪比下定距成功率
Table 3. Ranging success rates under different signal-to-noise ratios
信噪比/dB 定距成功率/% -10 100.00 -20 100.00 -26 99.90 -28 99.25 -30 91.40
下载: 导出CSV
-
[1] 段锐, 张海, 陈祝明, 等.垂直入射区雷达地面散射系数测量与特性研究[J].电子科技大学学报, 2012, 41(3):373-377. http://d.wanfangdata.com.cn/Periodical/dzkjdxxb201203010DAUN R, ZHANG H, CHEN Z M, et al.Radar terrain scattering return measurement and characteristics research in vertical incidence region[J].Journal of University of Electronic Science and Technology of China, 2012, 41(3):373-377(in Chinese). http://d.wanfangdata.com.cn/Periodical/dzkjdxxb201203010 [2] CALLA O P N, HARIT K C, VYAS R, et al.Comparison of measured scattering coefficient of dry soil at X-band with the scattering coefficient estimated using the dielectric constant[C]//IEEE International Geoscience and Remote Sensing Symposium.Piscataway: IEEE Press, 2007: 3135-3137. [3] 陈齐乐, 晏祺, 郝新红, 等.无线电近炸引信混沌码调相与线性调频复合调制波形设计与分析[J].兵工学报, 2018, 39(11):2127-2136. http://www.cnki.com.cn/Article/CJFDTotal-BIGO201811006.htmCHEN Q L, YAN Q, HAO X H, et al.Analysis of transmitting waveform of radio fuze modulated by chaotic bi-phased code and hybrid linear frequency modulation[J].Acta Armamentarii, 2018, 39(11):2127-2136(in Chinese). http://www.cnki.com.cn/Article/CJFDTotal-BIGO201811006.htm [4] 蔡炯.基于自相关函数包络检测的复合调制定距方法[J].计算机应用与软件, 2015, 32(9):123-126. http://qikan.cqvip.com/Qikan/Article/Detail?id=665936152CAI J.Complex modulation ranging method based on autocorrelation function envelope detection[J].Computer Applications and Software, 2015, 32(9):123-126(in Chinese). http://qikan.cqvip.com/Qikan/Article/Detail?id=665936152 [5] 郝新红.复合调制引信定距理论与方法研究[D].北京: 北京理工大学, 2007: 54-94.HAO X H.Study on the theory and method of radio fuze based on combining LFM with PRBP modulation[D].Beijing: Beijing Institute of Technology, 2007: 54-94(in Chinese). [6] 石润龙, 刘斌, 周军伟.无线电引信频域恒虚警率目标检测算法[J].探测与控制学报, 2010, 32(1):45-48. http://www.cnki.com.cn/Article/CJFDTotal-XDYX201001009.htmSHI R L, LIU B, ZHOU J W.CFAR target detection algorithm based on frequency domain for radio fuze[J].Journal of Detection & Control, 2010, 32(1):45-48(in Chinese). http://www.cnki.com.cn/Article/CJFDTotal-XDYX201001009.htm [7] 韩孟飞, 崔嵬, 吴嗣亮.一种新的雷达引信多门限频域恒虚警率检测算法[J].兵工学报, 2008, 29(12):1422-1426. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=bgxb200812003HAN M F, CUI W, WU S L.A new multi-threshold frequency domain constant false alarm rate detection algorithm for radar fuse[J].Acta Armamentarii, 2008, 29(12):1422-1426(in Chinese). http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=bgxb200812003 [8] 韩广超, 王锋, 赵河明, 等.一种新的变步长LMS自适应滤波算法及其应用[J].中北大学学报(自然科学版), 2017, 38(2):140-144. http://www.cqvip.com/QK/94550X/201508/665827365.htmlHAN G C, WANG F, ZHAO H M, et al.A new variable step size LMS adaptive filtering algorithm and its application[J].Journal of North University of China(Natural Science Edition), 2017, 38(2):140-144(in Chinese). http://www.cqvip.com/QK/94550X/201508/665827365.html [9] 王学敏, 许玉国, 孙永泽, 等.小波降噪在引信时频信号处理系统中的应用[J].探测与控制学报, 2013, 35(6):18-22. http://www.cnki.com.cn/Article/CJFDTotal-XDYX201306006.htmWANG X M, XU Y G, SUN Y Z, et al.Application of wavelet de-noising in time frequency signal processing system of fuze[J].Journal of Detection & Control, 2013, 35(6):18-22(in Chinese). http://www.cnki.com.cn/Article/CJFDTotal-XDYX201306006.htm [10] ZHANG P, NI Y F, WANG J L.Research on signal denoising method based on adaptive lifting wavelet transform[C]//2018 International Conference on Sensor Networks and Signal Processing (SNSP).Piscataway: IEEE Press, 2018: 306-310. [11] 黄琼丹.复杂调制雷达波形设计与信号处理研究[D].西安: 西北工业大学, 2016: 13-24.HUANG Q D.Research on the complex modulation radar waveform design and signal processing[D].Xi'an: Northwestern Polytechnical University, 2016: 13-24(in Chinese). [12] 孔志杰, 郝新红, 栗苹, 等.调频引信谐波时序检测抗干扰方法及实现[J].北京航空航天大学学报, 2018, 44(3):549-555. doi: 10.13700/j.bh.1001-5965.2017.0224KONG Z J, HAO X H, LI P, et al.Harmonic timing sequence detection anti-jamming method and its implementation for FM fuze[J].Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(3):549-555(in Chinese). doi: 10.13700/j.bh.1001-5965.2017.0224 [13] 田明浩, 徐晓丹, 刘芳, 等.基于扩频的复合混沌优选序列生成方法[J].沈阳理工大学学报, 2018, 37(5):1-6. http://d.old.wanfangdata.com.cn/Periodical_sygyxyxb201805001.aspxTIAN M H, XU X D, LIU F, et al.A compound chaos preferred sequence generation method[J].Journal of Shenyang Ligong University, 2018, 37(5):1-6(in Chinese). http://d.old.wanfangdata.com.cn/Periodical_sygyxyxb201805001.aspx [14] SCHROEDER C, ROHLING H.X-band FMCW radar system with variable chirp duration[C]//2010 IEEE Radar Conference.Piscataway: IEEE Press, 2010: 1255-1259. [15] HYUN E, JIN Y S.Human-vehicle classification scheme using Doppler spectrum distribution based on 2D range-Doppler FMCW radar[J].Journal of Intelligent & Fuzzy Systems, 2018, 35(6):6035-6045. http://www.onacademic.com/detail/journal_1000040870305710_8c71.html -
下载:
点击查看大图
计量
- 文章访问数: 569
- HTML全文浏览量: 187
- PDF下载量: 72
- 被引次数: 0
