基于FPGA的宽带线性调频信号的产生与实现北大核心CSCD

随着激光雷达技术的迅速发展,激光雷达的作用距离、分辨力和测量精度等性能指标不断提高。为了提升测量精度和距离分辨力,要求发射信号具有大的带宽。宽带线性调频信号有助于提高激光雷达的距离分辨力。针对远程测距中激光雷达测距精度低的问题,本文首先分析和比较了几种产生宽带线性调频信号的方法,针对远程测距的应用场景,提出并设计了一种宽带线性调频信号的实现方法。通过Matlab仿真实验,证明实验实现的可行性。最后在FPGA上进行实现,产生了带宽为150 MHz,距离分辨力为1 m的宽带线性调频信号。

Generation and realization of broadbandchirp signal based on FPGA

With the rapid development of lidar technology,the performance indicators of lidar including range,resolution,and measurement accuracy are continuously improved.In order to enhance the measurement accuracy and distance resolution,the transmitted signal is required to have a large bandwidth.Broadband chirp signal is helpful to improve the range resolution of lidar.In this paper,aiming at the problem of low accuracy of lidar ranging in remote ranging,several methods for generating broadband chirp signals are analyzed and compared firstly.Then,a broadband chirp signal implementation method for remote ranging application scenarios is proposed and designed.The feasibility of the experimental implementation is demonstrated through the Matlab simulation experiments.Finally,a broadband chirp signal with a bandwidth of 150 MHz and a range resolution of 1m is generated by the implementation on FPGA.