Carrier to Noise Ratio Weighted Algorithm in GPS Single Epoch Single Frequency Attitude Determination

doi:10.13485/j.cnki.11-2089.2014.0159

Abstract

Abstract:

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

JIN Tian YUAN Qing ZHENG Guanghui ZHANG Liyang. Carrier to Noise Ratio Weighted Algorithm in GPS Single Epoch Single Frequency Attitude Determination[J]. Acta Geodaetica et Cartographica Sinica, 2014, 43(10): 1032-1038.

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