Performance Evaluation Theory for Satellite Navigation Signals

Author(s):  
Zheng Yao ◽  
Mingquan Lu
Author(s):  
Leyang Sun Leyang Sun ◽  
Kunming Zhang Kunming Zhang ◽  
Lei Zhang Lei Zhang ◽  
Jian Li Jian Li

2011 ◽  
Vol 64 (S1) ◽  
pp. S73-S82 ◽  
Author(s):  
Lihua Ma ◽  
Guoxiang Ai ◽  
Haifu Ji

Unlike a direct broadcasting satellite navigation system, the transmitting satellite navigation system developed in China uses transponders onboard communication satellites to retransmit navigation signals generated at a ground master station. The transmitting navigation satellite constellation consists of a number of inclined geosynchronous orbit (IGSO) satellites. Considering China's mainland coverage in the northern hemisphere occupies some 62 degrees in longitude, the inclination of the IGSO satellites cannot be too high, or its signals would not be received by the users in the middle and high latitude areas when the IGSO satellite travels over the southern hemisphere. Meanwhile, the latitude of the most southerly station in China mainland that can uplink navigation signals is about 18°N when the IGSO satellite travels to the southern hemisphere. Therefore, there is a need to consider the IGSO inclination to achieve balance between uplinking high-quality navigation signals and covering the high-latitude area. In this work, the navigation performance and availability of the IGSO satellite are examined when navigation signals are uplinked from the stations Lintong and Sanya.


2017 ◽  
Vol 13 (11) ◽  
pp. 117
Author(s):  
Leping Zhang

Pricing mechanism and price supervision are the most important way to supervise the filed of public service. This paper studies the pricing methods and principles of Chinese public service product based on performance evaluation theory of public service, and compares the different methods of the urban public service pricing among various countries, then analyze the problems of the current pricing mechanism of Chinese urban public service product, and finally contribute suggestion to improve the pricing mechanism of Chinese urban public service product.


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