基于载噪比加权的GPS单频单历元定姿算法
Carrier to Noise Ratio Weighted Algorithm in GPS Single Epoch Single Frequency Attitude Determination
Received date: 2013-12-23
Revised date: 2014-07-22
Online published: 2014-10-24
金天 原青 郑光辉 张立杨 . 基于载噪比加权的GPS单频单历元定姿算法[J]. 测绘学报, 2014 , 43(10) : 1032 -1038 . DOI: 10.13485/j.cnki.11-2089.2014.0159
In?GPS?attitude?determination?system,?carrier?phase?and?code?measurements?from?two?antennas?are?used?to?get?precise?attitudes?such?as?pitch?and?yaw.?In?single?epoch?single?frequency?
attitude?determination?algorithm,?because?of?the?coarse?precision?of?carrier?phase,?the?observables?have?lower?accuracy?so?that?the?success?rate?of?single?epoch?attitude?determination?algorithm?
is?always?low.?In?order?to?improve?the?success?rate,?the?weighted?values?can?be?proposed.?The?traditional?elevation?weighted?algorithm?can’t?reflect?the?situation?of?occlusion?effectively.?To?
deal?with?this?problem,?this?paper?analyzes?the?accuracy?of?carrier?phase?by?the?carrier?to?noise?ratio?received?from?dual?antenna?receiver,?and?proposes?a?new?algorithm?based?on?weighted
?matrix?W.?In?the?new?algorithm,?the?leastsquares?(ILS)?are?used?to?estimate?ambiguity?and?baseline?vector.?The?proposed?algorithm?can?improve?the?success?rate?under?situation?when
?satellite?signal?is?weak?and?precision?of?carrier?phase?is?low.?By?Comparative?experiments,?it?is?verified?the?rationality?and?effectiveness?of?the?proposed?algorithm.?Simulation?results?
show?that?the?proposed?CN0?weighted?algorithm?can?increase?the?success?rate?of?single?epoch?attitude?determination?by?5?percent?compared?to?the?traditional?algorithm,?
1-2?percent?compared?to?the?elevation?weighted?algorithm.
Key words： GPS; attitude determination; single epoch; carrier to noise ratio
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