The invention discloses a method for resolving velocity ambiguity angle measurement of vehicle LFMCW radar, belonging to signal processing technology, in particular to resolving velocity ambiguity and radar virtual aperture measuring direction of arrival technology. In the invention, the velocity ambiguity resolution and the virtual aperture angle measurement processing of the MIMO radar are carried out in a frame signal. Taking the two transmitter four receiver radar system as an example, the radar transmitting end uses the time division multiplexing technology to transmit LFMCW signals with different slope time length and the same bandwidth, and the radar receiving end uses four receiving antennas to simultaneously receive the signals reflected by two transmitting antennas through objects. After mixing, low-pass filtering and a / D conversion, the echo signal finally enters DSP. In DSP, 2D \u2011 FFT and 2D CFAR detection are carried out first, then velocity ambiguity and phase compensation are solved, and finally virtual aperture angle measurement processing of MIMO radar is carried out, so as to realize the purpose of invention. The results include: reducing signal processing time and improving radar data rate.
【技术实现步骤摘要】
一种用于车载LFMCW雷达解速度模糊测角方法
本专利技术属于信号处理技术,具体涉及解速度模糊技术和MIMO雷达虚拟孔径测量波达方向技术。
技术介绍
77G车载毫米波雷达由于其大带宽、波长短、检测精度高、尺寸小等优点被越来越多地应用到汽车驾驶辅助系统上。该体制雷达的基本工作过程是发射机产生快速斜坡模式LFMCW波形,即发射频率随着时间线性变化的高频等幅连续波,也称为锯齿波。目标回波信号与发射本振信号混频,然后进行滤波处理,得到的差拍基带信号中包含目标的距离、速度和角度信息,可以通过差拍基带信号频率对目标进行测距、测速和测角处理。77G车载毫米波雷达利用测量目标回波谱线对于发射谱线的多普勒频率fd来确定目标相对雷达的径向速度。当fd大于斜坡重复频率fr的一半时,测得的目标速度将与(fd-nfr)/2(n为正整数)对应的目标速度相混淆。设目标实际速度为vr,雷达最高检测速度为vmax,目标模糊速度为va,则它们之间的关系满足公式1。在解速度模糊方面,可以利用剩余定理,使用两组不同的va和vmax可以解得唯一的vr。 ...
【技术保护点】
1.一种用于车载LFMCW雷达解速度模糊测角方法,该方法包括:/n步骤1:配置发射天线Tx1发射单斜坡时长为T
【技术特征摘要】
1.一种用于车载LFMCW雷达解速度模糊测角方法,该方法包括:
步骤1:配置发射天线Tx1发射单斜坡时长为Tr1的锯齿波信号chirp1,配置发射天线Tx2发射单斜坡时长为Tr2的锯齿波信号chirp2;两个发射天线利用时分复用技术发射信号,且保证Tx1的斜坡周期数n1和Tx2的斜坡周期数n2之间的关系满足公式2;
Tr1n1=Tr2n2
步骤2:利用接收天线即接收通道Rx1、Rx2、Rx3、Rx4分别接收Tx1和Tx2的回波信号,进行混频和滤波处理后得到8路缓存的差拍基带信号,每个接收通道先后有2路缓存信号,分别对应Tr1和Tr2...
【专利技术属性】
技术研发人员:邹林,黄述康,童纵,梁飞,汪学刚,钱璐,
申请(专利权)人:电子科技大学,
类型:发明
国别省市:四川;51
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