因此,每个斜坡生成 N = 500 = T · fA 个采样点,并与布莱克曼窗口(blackman)相乘,在零填充到 NZ = 1024 个样本后,计算每个斜坡的 FFT。 实验室中的测量如图 4 所示,显示距离限制为 7 m。 图4 使用 2D-FFT 进行检测:3 m 处的移动目标,5 m 处的静态目标 In the upper part the time domain ...
(3)雷达信号处理部分radar_data_processing_multi_target(RX1_CHIRPS_I,RX1_CHIRPS_Q,RX2_CHIRPS_I,RX2_CHIRPS_Q,TargetTracks,target_num); function radar_data_processing_multi_target(I1, Q1,I2,Q2,TargetTracks,target_num) RANGE_MIN = 16; RANGE_MAX = 64; DPL_FFT_POINTS = 32; DPL_FFT_INTV...
由上式知,回波信号的频率与时延tx有关,即与探测距离有关,对中频信号进行FFT即可得到中频信号的频率[11]。 2.2 数字化系统设计 去调频处理在接收机内完成,得到模拟中频信号。为使得能在FPGA中完成距离向成像处理,在接收机和FPGA间加入AD采集模块。图2所示为FMCW体制距离向成像方法的4大组成模块:去调频、AD采集、数...
针对上述问题,本文提出一种基于MIMO-FMCW 雷达的多人生命体征检测方法,所提方法首先对中频信号进行距离维FFT 和Capon 算法得到距离角度矩阵,通过二维恒虚警检测技术(Two Dimension Constant False Alarm Rate Detector,2DCFAR)和基于密度的聚类(Density-Based Spatial Clustering of Applications with Noise,DBSCAN)算法确定...
In his book Multirate Signal Processing, Fred Harris mentions a great problem solving technique: "When faced with an unsolvable problem, change it into one you can solve, and solve that one instead." We will see in this article how an FMCW radar is one of the most beautiful applications...
(2D-FFT) processing algorithm.Target whose beat frequency does not lie on the FFT grids suffers from great detection degradation.Doubling the number of FFT points,and consequently,the hardware processing complexity is a common solution to solve this problem.In this paper,a proposed method to ...
Generating targets and detecting range and velocity from simulated FMCW waveform radar signals using the Range/Doppler FFT method and displaying targets using the 2D CFAR visualization. matlab radar fft autonomous-driving fmcw fmcw-waveform cfar-processing Updated Dec 25, 2020 MATLAB bert...
The application of 2D FFT algorithm in LFMCW radar signal processing and its performance analysis. Electron Sci Tech, 2005, 5: 25–32 [王月鹏, 赵国庆. 二维 FFT 算法在 LFMCW 雷达信号处理中的应用及 其性能分析. 电子科技, 2005, 5: 25–32] 43 Elhag N A A, Osman I M , Yassin A A. ...
11 FMCW RADAR Digital Signal Processing Similar to the range resolution, the doppler resolution is limited by the spectral resolution of the doppler FFT, which is 2 Pi divided by N. Substituting results in the vres formula, we get the following equation. Find here example waveform paramet...
如上图, 被物体反射后的信号可以简单的看做是发射信号的延时,用t(时间差值)来表示,t=2d/c,接收信号与发射信号混频后的输出信号频率恒定,假设IF的频率为f,那么f=St=S2d/c (S为调频连续波的斜率),其中d为物体的距离,c 为光速。对混频后的信号做FFT变换,可以得到单峰值频谱图。从上图中可以看出,...