The purpose of this paper is to disclose improved crystal based frequency source system covering design techniques and experimental methodologies for the stabilization of phase noise performance of X-band phase-locked loop (PLL) at 10.6 GHz. Phase noise performance of PLL-based unit under test (UUT) is prone to disturbance occurred in random vibration profile frequency spectrum. UUT self-resonance plays vital role in occurrence of disturbance in random vibration profile. The stabilization of phase noise performance during dynamic (random) vibration condition is achieved by following methodologies, i.e. vibration-isolator compensation techniques, purification tactic for reference crystal of PLL, and spatial location analysis for finding out mounting position of reference crystal. Spatial analysis helps to filter out UUT self-resonance frequency from random vibration spectrum which leads to reduction of frequency resonance pickups during random vibration testing.

中文翻译：

---

机载应用动态振动条件下锁相环系统相位噪声性能稳定

本文的目的是公开改进的基于晶体的频率源系统，涵盖用于稳定 10.6 GHz 的 X 波段锁相环 (PLL) 的相位噪声性能的设计技术和实验方法。基于锁相环的被测单元（UUT）的相位噪声性能容易受到随机振动轮廓频谱中的干扰。UUT自谐振在随机振动剖面中的干扰发生中起着至关重要的作用。动态（随机）振动条件下相位噪声性能的稳定是通过以下方法实现的，即隔振器补偿技术、锁相环参考晶体的净化策略以及找出参考晶体安装位置的空间位置分析。