Real-time precise point positioning (RTPPP) is a preferred method for ocean high-precision location services, but its positioning performance depends on high-precision state space representation (SSR) corrections. At present, Inmarsat are used to transmit SSR corrections in areas with poor Internet such as the open sea, but the communication cost is extremely expensive. Therefore, this study proposes a strategy of SSR encode and Beidou short-message broadcast for ocean RTPPP. On the one hand, for the limitation of the narrow bandwidth of Beidou short-message, a coding strategy combining difference and non-difference between epochs is adopted to make full use of visible satellites, and the resolution is readjusted so that a Beidou card can broadcast the number of satellites from 2 to 19. On the other hand, in order to overcome the limitation of low broadcast frequency of short-message, two Beidou cards are used to broadcast the SSR corrections of visible satellites at equal intervals within one minute, which can effectively reduce the data delay and enable RTPPP. The experimental results show that the three-dimensional positioning accuracy of the BDS/GPS combination is better than 0.35 m, and the horizontal positioning accuracy is better than 0.25 m.
Research on SSR Encode and Short-Message Broadcast Strategy for Ocean Real-Time Precise Point Positioning
Lect. Notes Electrical Eng.
China Satellite Navigation Conference (CSNC 2022) Proceedings ; Chapter : 23 ; 264-274
2022-05-05
11 pages
Article/Chapter (Book)
Electronic Resource
English
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