【摘 要】
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The structure designing of satellite clock correction,ephemeris and system time parameters in navigation message directly affects navigating performance such as
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The structure designing of satellite clock correction,ephemeris and system time parameters in navigation message directly affects navigating performance such as the time to first fix.Considering the message reading point as a random variable and creating ephemeris acquisition time as a function of the reading time,we integrated the acquisition time of the ephemeris in GPS L2C CNAV random data block and L1C CNAV2 stationary message structure by 95% confidence level.The designing discrepancy of the GPS、Galileo data structure which is broadcasted on different frequency and its influence to the first time to access positioning information was emphatically discussed.Finally,we presented the key factor of navigation message structure designing to reduce the time to first fix that was ephemerisbeing consistent during effective time interval,almanacframeproportion ofthe totalframe sizeshould be appropriate and messageparametersshould be morecompact.
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