GPS接收機(jī)中晶振誤差的模擬方法
A Method for Simulating the Crystal Oscillator Errors in GPS Receiver
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摘要: GPS(Global Positioning System)接收機(jī)中參考頻率源的性能對(duì)接收機(jī)整體性能有著諸多影響。該文對(duì)在GPS接收機(jī)中使用最多的晶振的誤差特性和性能影響進(jìn)行了分析，在此基礎(chǔ)上提出了一種模擬晶振頻率誤差的方法，即首先確定晶振在給定取樣時(shí)間間隔上各主要隨機(jī)誤差成分的Allan(阿侖)方差參數(shù)，由此反演產(chǎn)生相應(yīng)的各項(xiàng)晶振頻率誤差模擬序列并進(jìn)行疊加。文中給出了計(jì)算機(jī)數(shù)值模擬的方法，并對(duì)仿真實(shí)驗(yàn)結(jié)果進(jìn)行了分析，從而為GPS接收機(jī)設(shè)計(jì)、性能評(píng)估和測(cè)試平臺(tái)如GPS信號(hào)模擬器的研制提供有關(guān)的理論支持和設(shè)計(jì)方法。
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關(guān)鍵詞:
- GPS; 頻率穩(wěn)定度; 晶振; Monte Carlo模擬; Allan方差
Abstract: The frequency source in Global Positioning System (GPS) receiver has a great many influence on the whole performance of the receiver. Based on the analysis of error characteristics and performance effect of the mostly used crystal oscillator, a method to simulate the frequency error of crystal oscillator is proposed. The major idea is to determine the Allan variance parameter of each main stochastic error component at the given sampling interval at first, then to deduct a set of corresponding frequency error series and superpose them together. The computer numerical simulation approach and the experimental results are given. This research provides related both theoretical reference and practical design for the development of an integrated design, test and evaluation platform such as a GPS signal simulator. -
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