摘要
在航天测控领域中,测控系统的动态捕获、跟踪性能和测量精度是非常重要的因素。为检测雷达的动态捕获、跟踪性能和测量精度,在多普勒频率模拟器中,采用混合式频率合成技术(DDS+PLL)。对直接数字频率合成技术和锁相环技术进行了分析,提出了设计方案。该技术可以实现高精度、快速率的频移补偿,且不会影响原有信号的相位特性,使用该方法解决了小频率间隔与低相位噪声输出之间的矛盾。并且具有频率分辨率高,输出相位噪声低的优点,同时具有较好的杂散抑制性能。
In space flight observe and control field, observe and control catching, following performance and measuring precision are important factors, in order to measure and observe and control catching, following performance and measuring the precision dynami- cally of the radar ,in dropper frequency simulator, the frequency synthesization technique used both DDS and PLL can achieve exact and high-speed frequency shift compensation. This text analyses and proposes the design plan based on dynamic Doppler＇s simulator of DDS and PLL. What＇s more important, this technique don＇t affect the phase character of inherent signal. It can solve the contradiction between small frequency interval and low phase-noise output. And it has the higher resolution, higher accuracy, more convenient control of frequency variance but also performs better for spurious characteristic
出处
《微计算机信息》
2009年第13期279-281,共3页
Control & Automation
