Dynamic Satellite Positioning via LEO Orbit and Clock Corrections
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Solution Overview
Problem
Conventional Real Time Kinematic GNSS positioning systems suffer from long initialization processing times and low fix rates due to errors such as delay errors, satellite orbit errors, clock errors, and inaccuracy of reference points, which complicate the processing and reduce positioning accuracy.
Innovation Solution
A satellite positioning system utilizing non-geostationary low Earth orbit Internet satellites, connected via IPsec-VPN, that includes signal processing and reception systems to generate, transmit, and process carrier waves for precise positioning, using orbit information, location information, and atomic clock time to calculate the mobile station's position, with digital modulation and demodulation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional Real Time Kinematic GNSS positioning uses complex processing to remove various errors, then positioning accuracy is improved, but initialization processing time increases and fix rate decreases
Solution Approach 1:
The system performs preliminary actions by pre-calculating and storing satellite orbit information and clock correction data before positioning is needed. The reference station pre-processes error parameters and prepares correction data in advance, so that when positioning is required, the mobile station can quickly apply these pre-prepared corrections without undergoing lengthy initialization processing, thus reducing initialization time while maintaining accuracy
Solution Approach 2:
The positioning system segments the error correction process into separate components: satellite orbit errors, clock errors, ionospheric delays, and tropospheric delays are handled independently through dedicated correction mechanisms. This segmentation allows the mobile station to apply corrections in a structured manner, reducing the complexity and time of initialization processing while achieving high positioning accuracy
2Measurement precision
If conventional Real Time Kinematic GNSS positioning uses complex processing to remove various errors, then positioning accuracy is improved, but fix rate decreases
Solution Approach 1:
The reference station performs preliminary calculations of error parameters and prepares correction data in advance. By pre-processing the complex error removal calculations and making correction data readily available, the mobile station can quickly acquire fixes without waiting for lengthy real-time computations, thereby improving fix rate while maintaining positioning accuracy
Solution Approach 2:
The mobile station is designed to independently apply correction data received from the reference station without requiring complex real-time processing assistance. The system enables the mobile station to self-service by autonomously applying pre-prepared corrections to its measurements, accelerating the fix acquisition process while achieving accurate positioning
Data Source
AI summary
A satellite positioning system with a short initialization processing time and a high fix rate in a Real Time Kinematic satellite positioning system. The Real Time Kinematic satellite positioning system has a mobile station of a user and a transmitting station installed on the ground, and performs positioning using Internet satellites flying above the sky. The mobile station, the transmitting station, and a predetermined Internet satellite are connected to each other by an IPsec-VPN. The positioning system obtains an atomic clock time from the GNSS satellite flying above the sky. The transmitting station obtains its own position information from reference point information obtained from a reference station located within 10 km from the transmitting station and orbit information of predetermined Internet satellites.