频率调制对雷达线性调频脉冲压缩性能的影响

Effect of Frequency Modulation on the Performance of Pulse Compression in Radar Linear Frequency Modulation

摘要: 分析了频率调制对线性调频脉冲压缩雷达输出信号幅度和宽度的影响,包括匹配滤波器和加权滤波器两种情况. 对利用正弦调相产生多个输出信号的方法进行了分析. 推导了有关计算公式,给出了计算机仿真结果. 结果表明,频率调制对雷达脉压输出信号幅度和脉宽的影响直接由频率调制失配因子<em<χ</em<(频率调制相对变化量与脉压比的乘积)决定. 当<em<χ</em<足够大时,信号幅度减小倍数近似为<em<0.54 χ ,</em<信号脉宽增加倍数近似为<em<χ/k(k＞1时)或χ(k＜1</em<时).

Abstract: The effect of frequency modulation on compressed-pulse signal-amplitude and pulse-width of linear frequency modulation(LFM) radar were analyzed for both the matched filter and the weighted filter. The method using sine phase modulation to produce multiple compressed-signals is also analyzed. Analytical expressions were derived and computer simulation results given. The results showed that the effect of frequency modulation on compressed-pulse signal-amplitude and pulse-width of LFM radar is determined directly by the frequency modulation mismatch factor <em<χ</em< (the product of frequency modulation relative variations and pulse compression ratio). When <em<χ</em< is large enough, signal-amplitude decreases <em<0.54 χ </em< times and pulse-width increases <em< χ/k</em< (when <em< k＞1)</em< or <em< χ</em< (when <em< k＜1)</em< times.