【摘 要】
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Beidou high-precision terrestrial navigation system is a passive and independent navigation system composed of terrestrial pseudolites and built for high-precision positioning purpose.In the frequency
【机 构】
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State Key Laboratory of Satellite Navigation System and Equipment Technology, No.589 West Zhongshan
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Beidou high-precision terrestrial navigation system is a passive and independent navigation system composed of terrestrial pseudolites and built for high-precision positioning purpose.In the frequency band(2.4835GHz-2.5GHz) where RDSS works,a comprehensive analysis was made to such design factors as bandwidth,modulation,message and time hopping pattern in the signal design of BeiDou terrestrial pseudolites system from the perspective of compatibility and high-precision ranging,with the emphasis on the signal ranging performance,compatibility between ground signal and signal in space as well as the influence of near-far effect between terrestrial pseudolite signals to receiver ranging.Upon it,another analysis was made to the design requirements for subcarrier modulation mode and pseudolite time-hopping pattern.On the basis of 10230-long Weil code,a time-hopping terrestrial pseudolite signal was developed.Besides,a semiphysical verification platform was built,which was used to verify the high precision positioning performance of the interested signal.The signal test results showed that it enabled the receiver to gain a near 4cm static positioning accuracy.
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