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很多军用系统,如以相参雷达为基础的系统,都需要相位噪声很低的频率源。但是,石英晶体谐振器对加速度是敏感的,故振动台上的振荡器会受到频率调制,使得振荡器的相位噪声严重恶化。既可以减小振功(加速度)影响而又不依靠笨重和庞大减振器的方法有好几种。其中包括改进谐振器、谐振器组、变容管调整、电容加速度传感器调整和偏振效应调整。在过去几年里,这几个方面都取得了一些进展。但是,制造出有效灵敏度(g)为2×10~(-12)/g振荡器的主要目标仍未达到。本文介绍用“偏振效应调整法”得到的最新结果。用这种方法,在振动频率为5Hz～350Hz时,商业性振荡器的加速度敏感度可从8×10~(-10)/g降到8×10~(-12)/g。本文还对抑制振动诱发边带所需的幅度和相位精度进行了分析。
Many military systems, such as systems based on coherent radar, require low-phase noise sources. However, quartz crystal resonators are sensitive to acceleration, so the oscillator on the vibrating table is frequency-modulated, causing the phase noise of the oscillator to deteriorate seriously. There are several ways to reduce the effect of vibration (acceleration) without relying on bulky and bulky shock absorbers. These include improved resonators, resonator sets, varactor adjustments, capacitive acceleration sensor adjustments, and polarization effects adjustments. In the past few years, some progress has been made in these areas. However, the main goal of creating an oscillator with an effective sensitivity (g) of 2 × 10 ~ (-12) / g has not yet been reached. This article describes the latest results obtained using the Polarization Effect Adjustment Method. In this way, the sensitivity of commercial oscillators can be reduced from 8 × 10 -10 / g to 8 × 10 -12 / g at vibration frequencies of 5 Hz to 350 Hz. This article also analyzes the amplitude and phase accuracy required to suppress vibration-induced sidebands.