线性调频信号的一种新的频域脉压处理方法

线性调频波形由于多普勒性能突出，一直是一种在雷达中具有广泛应用的脉冲压缩波形，但是线性调频的距离旁瓣不够理想，强目标的旁瓣过高就有可能淹没弱目标的主瓣。该文根据线性调频信号的频谱结构，采用频域数字处理技术，提出了一种新的基于理想压缩脉冲的频域滤波器（SSF）设计方法，导出了可实现低的压缩脉冲距离旁瓣的条件。与其它方法相比，线性凋频信号由该文方法压缩后主副瓣比得到很大的提高，并且主瓣不会展宽，因此不影响距离分辨力。通过数学公式推导和计算机仿真表明，所提出的方法是正确的和可行的，而且步骤简单，运算量小，易于实现。

A New Method of Pulse Compression in Frequency Domain for LFM Signal

The linear frequency modulation (LFM) waveform has been widely used in radar applications because of its excellent Doppler performance, but the sidelobe level of its autocorrelation function is far from satisfactory, and the mainlobe of weak target can't be discovered because of the sidelobe of strong target . In this paper, using digital frequency - domain processing techniques, a new frequency domain design method of digital filter(SSF) based on the ideal wave of compression pulse is described, and the qualification for side - lobe suppression of pulse compression signal is educed. Compared to other methods, LFM signal compressed by the new method in this paper , can obtain the lower sidelobe and better resolution . Arithmetic formula derivation and computer simulation show: the new method in this paper is right and feasible , and it is simple in process, small in calculation amount and easily comes true.