Abstract
Navigation message is one of the basic data for the user to realize positioning. It is send to all users by the navigation signal and realizes the position and time function. The navigation message includes ephemeris prediction parameter, clock error prediction parameter, ionosphere delay model parameter, difference information, etc. The rationality of navigation message design relates directly the position efficiency, agility, and utilization ratio of channel link resource. The main factors of influencing performance of navigation message include navigation information parameter model, the message layout structure, message broadcast mode, channel error correction coding, etc. The message layout structure, the navigation message channel error correction coding, and message broadcast pattern associated with the message broadcast situation can be summarized to the navigation message broadcast performance. Navigation information parameter model is directly related to the user equivalent range error, and can be concluded to the user’s using performance. Based on analyzing the performance element of navigation message, this paper deeply studied and analyzed the method of navigation message broadcast performance evaluation, and the calculated result is about GNSS at home and abroad. It supplies the basis for navigation message design of global satellite navigation system for our country.
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