Satellite Positioning Using Augmented and Unaugmented Signals
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Solution Overview
Problem
Existing satellite positioning systems are limited by the availability of augmentation information, which restricts the use of certain satellites for precise positioning, particularly in urban areas where signals are blocked, leading to reduced precision and limited satellite availability.
Innovation Solution
A positioning apparatus that detects pseudo ranges and carrier phase integrated values from both satellites with and without augmentation information, corrects errors using provided augmentation data, and performs positioning using time difference values to incorporate all available satellites into the calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only satellites with augmentation information are used for positioning, then positioning precision is improved, but the number of available satellites is reduced
Solution Approach 1:
The patent divides satellites into two categories: those with augmentation information and those without. It then applies different processing methods to each category - using augmentation information for precision correction on the first group, and time difference positioning for the second group. This segmentation allows both types of satellites to be utilized effectively without compromising precision.
Solution Approach 2:
The patent creates a universal positioning approach that can handle both satellites with and without augmentation information using a single integrated system. The positioning apparatus universally processes all available satellites by selecting appropriate methods (augmentation-based or time difference-based) for each satellite, making the system adaptable to various satellite types while maintaining precision.
2Quantity of substance
If time difference positioning is used for satellites without augmentation information, then the number of usable satellites is increased, but positioning precision may be compromised
Solution Approach 1:
The patent merges the positioning results from satellites with augmentation information and satellites without augmentation information into a single unified positioning solution. By combining the precision corrections from the first group with the time difference measurements from the second group, the system achieves both increased satellite utilization and maintained precision through integrated processing.
Solution Approach 2:
The patent introduces time difference positioning as an intermediary method that bridges the gap between satellites with and without augmentation information. This intermediary approach allows satellites without augmentation data to contribute to the positioning solution in a way that is compatible with the precision requirements, effectively mediating between quantity and precision needs.
3Measurement precision
If augmentation information is provided for all signal types, then positioning precision is improved, but system complexity increases
Solution Approach 1:
Instead of providing augmentation information for all possible satellite signals (excessive action), the patent applies augmentation information selectively only to satellites that have available correction data (partial action). This partial application maintains positioning precision for those satellites while avoiding the unnecessary complexity of processing augmentation data for satellites where it is not available.
Data Source
AI summary
A positioning apparatus (100) detects pseudo ranges and carrier phase integrated values from ranging signals (L1C/A) for which augmentation information ([LC/A]) is provided, detects pseudo ranges and carrier phase integrated values from ranging signals (B1C) for which augmentation information is not provided, acquires correction data ([LC/A]) for the ranging signals generated from the augmentation information, corrects the pseudo ranges and the carrier phase integrated values of the ranging signals (L1C/A) with the correction data ([LC/A]), generates a first observation equation using the corrected pseudo ranges and carrier phase integrated values of the ranging signals (L1C/A), generates a second observation equation using a time difference value between the pseudo ranges and a time difference value between the carrier phase integrated values of the ranging signals (B1C), and performs positioning by executing a filter operation using the first observation equation and the second observation equation.