Satellite Positioning Protocol Superimposition for Decimeter Accuracy
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Solution Overview
Problem
Current Global Navigation Satellite Systems (GNSS) suffer from low positioning accuracy, which is insufficient for industries requiring decimeter-level precision such as precision agriculture and high-accuracy measurement.
Innovation Solution
A satellite positioning system that enhances accuracy by superimposing correction parameters like satellite orbit, clock difference, and ionosphere corrections onto the basic navigation message through protocol superimposition, allowing for real-time high-accuracy positioning without additional communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction parameters are transmitted through separate communication channels to improve positioning accuracy, then positioning accuracy is improved, but device complexity and communication requirements increase
Solution Approach 1:
The patent merges correction parameters with basic navigation messages into a single integrated message structure. The correction parameters (including satellite clock difference correction, satellite orbit correction, and ionosphere correction) are embedded within the existing navigation message framework, allowing simultaneous transmission of both basic navigation data and correction data through the same communication channel, thereby eliminating the need for separate communication channels while maintaining positioning accuracy
Solution Approach 2:
The navigation message structure is designed to serve multiple functions: it simultaneously provides basic navigation information and correction parameters for accuracy enhancement. This multi-functional message structure allows the same communication infrastructure to support both standard positioning and high-accuracy positioning requirements without additional hardware or communication channels
2Measurement precision
If multiple correction parameters are superimposed onto navigation messages to improve positioning accuracy, then positioning accuracy is improved, but information processing complexity increases
Solution Approach 1:
The correction parameters are segmented into distinct categories (satellite clock difference correction, satellite orbit correction, ionosphere correction, and partition comprehensive correction) with different update frequencies. This segmentation allows the receiver to process only the necessary correction parameters at appropriate intervals, reducing overall processing complexity while maintaining accuracy
Solution Approach 2:
Correction parameters are pre-calculated and prepared at ground stations before being transmitted to satellites. The parameters are organized and formatted in advance according to the navigation message structure, reducing the processing burden on onboard satellite systems and enabling efficient transmission and reception
3Measurement precision
If high-frequency correction parameters are transmitted to improve real-time positioning accuracy, then positioning accuracy is improved, but communication bandwidth requirements increase
Solution Approach 1:
The system dynamically adjusts the transmission frequency of different correction parameters based on their update rates and importance. Fast-changing parameters like satellite clock difference correction are transmitted more frequently, while slower-changing parameters like satellite orbit correction are transmitted at lower frequencies. This dynamic transmission strategy ensures real-time accuracy for critical parameters while optimizing overall communication bandwidth utilization
Data Source
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AI summary
The present application provides a satellite positioning method and a satellite positioning system. The system comprises a satellite, a base station, an observation station. The observation station is provided with a monitoring terminal and a correction parameters information generating apparatus, the monitoring terminal receiving observation data transmitted from the satellite; the correction parameters information generating apparatus generating a correction parameters based on the observation data, the correction parameters being transmitted to the base station. The base station is provided with a switch and a message parameter superimposition-encoding-and-broadcasting apparatus, the switch receiving a basic navigation message from the satellite; the message parameter superimposition-encoding-and-broadcasting apparatus encoding the correction parameters into the basic navigation message by protocol superimposition, and setting the broadcasting of the integrated-encoded message into which the correction parameters is encoded, the integrated-encoded message being transmitted to the satellite by the switch via an uplink injection link. The satellite broadcasts the integrated-encoded message received from the base station, wherein the correction parameters comprises a partition comprehensive correction and one or more of a satellite orbit correction, a satellite clock difference correction and an ionosphere correction.