基于脉内相位编码脉间频率步进（PCSF）雷达信号的特点，提出了利用复杂可编程逻辑器件、直接数字频率合成器（DDS）和锁相环倍频器产生任意PCSF雷达信号的方法，并实际构造了一个宽带、低噪声的S波段PCSF信号源。利用该方法可以实现对输出信号相位的精确控制，通过选择DDS输出信号的频率范围可以减少带内的杂散分量。测试结果表明：该频率源在320 MHz带宽内的无杂散动态范围为62 dBc，相位噪声为-110 dBc/Hz@1 kHz。

A method of producing arbitrary phase coded stepped frequency (PCSF) radar signal was proposed based on the characteristics of this signal which incorporates complex programmable logic devices, direct digital synthesizer (DDS) and phase locked loop based frequency multiplexer. A S band PCSF frequency synthesizer with low spurious noise and wideband was built using this method. With this method, phase of the output signal can be precisely controlled, and output of DDS was selected to ensure low spurs in the entire bandwidth. Experimental results demonstrate that at 320 MHz the overall spurious free dynamic range was better than 62 dBc and the phase noise was lower than -110 dBc/Hz@1 kHz.

TN74