PCB温度对GNSS接收机跟踪环路的影响分析  

Analysis of PCB Temperature Effects on GNSS Receivers' Tracking Loop

作　　者：徐兵 窦杰 窦磊[1] XU Bing,DOU Jie,DOU Lei(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,Chin)

机构地区：[1]南京理工大学瞬态物理国家重点实验室,江苏南京210094

出　　处：《仪表技术与传感器》2018年第6期45-48,共4页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(60904085);南京理工大学瞬态物理国家重点实验室基金项目;国防科技创新特区基金项目

摘　　要：着重分析了印制电路板(PCB)的温度变化对全球导航卫星系统(GNSS)接收机锁相环的影响。用静止的伪卫星发射类似GNSS的高载噪比信号,以减小径向动态和热噪声导致的跟踪误差,从而有利于评估PCB温度的影响。使用温度传感器ADT7320同时测量PCB和环境温度,并以晶振的频率变化和环路相位跟踪误差为指标,评估PCB温度变化对接收机跟踪环路的影响。实验表明:PCB温度的变化会降低环路的跟踪性能。特别是在环路带宽较窄时,温度变化导致的动态应力误差较为显著,对于利用载波相位测量值进行精密定位等应用来说不可忽略。The effect of the printed circuit board（ PCB） temperature variation on Global Navigation Satellite System（ GNSS）receivers＇ phase-locked loop was emphatically analyzed. A stationary pseudolite was used to transmit GNSS-like signals with high carrier-to-noise ratio,which reduced the radial motion-induced dynamic stress error and the thermal noise-induced error,thus benefitting the assessment of the effect of PCB temperature. The temperature sensor chip,ADT7320,was used to measure the PCB and ambient air temperature simultaneously. The effect of PCB temperature variation on receivers＇ tracking loop was analyzed in terms of the oscillator＇s frequency variation and the loop＇s phase tracking error. The experimental results show that the PCB temperature variation will degrade the loop＇s tracking performance. In particular,the temperature variation-induced dynamic error is remarkable at a narrow bandwidth. This effect is not negligible for some applications,e.g. precision positioning using carrier phase measurements.

关 键 词：温补晶振 全球导航卫星系统 接收机 印制电路板 温度传感器 锁相环 

分 类 号：V241[航空宇航科学与技术—飞行器设计]