Ocean precise point positioning method

Abstract

The invention discloses an ocean precision single-point positioning method. The method includes: firstly, utilizing a multi-card Beidou short message data transmission terminal to transmit Beidou satellite orbits and clock error correction numbers in a time-sharing forwarding mode; and secondly, in two complete correction number transmission periods, adopting inter-epoch differential positioning to meet the real-time performance of high-precision positioning. Inter-epoch differential positioning is utilized at the same time, and the problem that the sampling frequency of a receiver is not matched with the data transmission frequency of a Beidou ID card is solved. The high-precision relative position solution between epochs is obtained, the absolute position is recursively deduced through the high-precision relative position solution, the real-time performance of high-precision positioning is met, and the actual operation requirement of navigation is met.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and relates to a marine precise single point positioning method, in particular to a marine precise single point positioning method based on Beidou navigation and communication integration. Background technique [0002] Precise Point Positioning (PPP) technology has the advantages of a single receiver, no need for base station assistance, and high precision. It can provide high-precision position references for applications such as ocean development, ocean exploration, and offshore operation support. One of the preferred technologies for absolute high-precision location services in the ocean. [0003] The positioning performance of PPP largely depends on the quality of precise satellite orbit and clock error products. As the demand for real-time high-precision location services becomes increasingly prominent, the International GNSS Service (IGS) has launched a precisio...

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Problems solved by technology

[0003]The positioning performance of PPP largely depends on the quality of precision satellite orbit and clock error products. With the increasing demand for real-time high-precision location services, international GNSS services (International GNSS Service, IGS) launched the real-time service (Real-Time Service, RTS) of precise satellite orbit and clock error products. At the same time, commercial companies such as Veripos, Fugro, Trimble, etc. -PPP) high-precision location service. The data transmission of the precise satellite orbit and clock difference products of this type of service all use Imarsat maritime satellites. The service cost is expensive, and the user's location information is in danger of leaking

With the global networking of my country's Beidou third-generation satellite navigation system, the Beidou short message communication function meets the requirements of global sea area coverage, and has the characteristics of low cost and good confidentiality, but is limited by the frequency and bandwidth of Beidou short message communication Limitations, unable to meet the demand for precise satellite orbit and clock error product output

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