【摘 要】
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Navigation message is one of basic data that user realize positioning.It is send to all users by the navigation signal and realizes the position and time function.The navigation message includes ephem
【机 构】
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Beijing Satellite Navigation Center, 100094, Beijing, China
论文部分内容阅读
Navigation message is one of basic data that user 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 and difference information etc.The rationality of navigation message design relates directly position efficiency,agility and utilization ratio of channel link resource.The main factors of influencing performance of navigation message includes navigation information parameter model,the message layout structure,message broadcast mode and channel error correction coding,etc.And the message layout structure,the navigation message channel error correction coding,and message broadcast pattern associated with the message broadcast situation,that 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 users using performance.Based on analyzing performance element of navigation message,this paper deeply studied and analysed the method of navigation message broadcast performance evaluation,and the calculated result is given 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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