摘要
为了降低合成孔径雷达(SAR)方位预处理在FPGA上实现的复杂度,提高软件调试和开发的效率,本文提出了一种基于TI的TMS320C6678单芯片多核DSP并行实现方位向预滤波的方法,该方法首先将预滤波原始数据按照距离向分段,对距离分段后的数据分配给8个核以实现并行处理,其次用时域相关法精确估计回波信号的多普勒中心频率,然后利用傅里叶变换的谱搬移特性自适应调整滤波器中心频率,最后在时域实现预滤波和降采样功能。该方法相对于传统方式而言,在提高滤波输出信号的信噪比的同时可以灵活改变滤波器参数,提高系统灵活性。
To reduce complexity of synthetic aperture radar （SAR） preprocessing in azimuth on FPGA implementation, improve the efficiency of software debugging and development, a mehtod based on TI＇ s TMS320C6678 single - chip muhicore DSP to achieve parallel implementation of pre -filtering in azimuth is presented, by which, the prefiltering raw data is firstly segmented in range, and the range segmented data are assigned to 8 cores so as to implement parallel processing ; and secondly, the Doppler central frequency of echo signal is estimated preciselly by using time domain cor- relational method, then central frequency of filter is adjusted adaptively by using specturm movable characteristics of Fourier transform, and finally prefiltering and downsampling function in time domain is implemeted. Comparing with conventional method, using this method can alter parameters of filter flexibly and improve flexibility of system while in- creasing signal - to - noise ratio of filter output signal.
作者
张开生
向聪
马可
Zhang Kaisheng Xiang Cong Ma Ke(Xi＇ an Electronic Engineering Research Institute, Xi＇ an 710100)
出处
《火控雷达技术》
2016年第4期56-60,共5页
Fire Control Radar Technology
