Timing Signal Generation Using Statistical Position Filtering
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Solution Overview
Problem
GPS receivers face challenges in generating accurate timing signals due to errors in positioning calculations, especially in deteriorating reception environments, where methods like averaging can increase errors and reduce accuracy.
Innovation Solution
A position information generation device and timing signal generation device that use a value within a range of A±σ/4, where A is the most frequent or median value of positioning calculation results and σ is the standard deviation, to minimize the influence of large errors, such as those caused by multi-paths, and generate more accurate timing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If averaging positioning calculation results is used to acquire position information, then cost is reduced and position information can be acquired at any reception location, but accuracy of timing signal may deteriorate when positioning errors occur
Solution Approach 1:
The patent extracts and removes erroneous positioning results from the dataset by identifying outliers that deviate significantly from the majority of results. Instead of averaging all results including erroneous ones, the system selectively excludes abnormal values, thereby preventing them from degrading the accuracy of the final position information and timing signal.
Solution Approach 2:
The patent implements a feedback mechanism where the system evaluates the distribution of positioning calculation results, identifies outliers based on statistical criteria, and adjusts the position information generation process accordingly. This feedback loop ensures that erroneous results are detected and excluded, maintaining high accuracy while still using multiple positioning calculations.
2Adaptability or versatility
If multiple positioning calculation results are averaged, then position information can be obtained without external sources, but the influence of large errors such as multi-path effects increases
Solution Approach 1:
The patent converts the harmful effect of multiple positioning calculations (which can include erroneous results) into a benefit by using statistical analysis. The system leverages the fact that most results are accurate while only a few are erroneous, using this distribution pattern to identify and exclude outliers, thereby transforming the potential harm of multiple calculations into a robust error-resistant positioning method.
Solution Approach 2:
The patent introduces statistical analysis as an intermediary between raw positioning calculation results and final position information. This intermediary process evaluates the distribution of results, identifies outliers, and determines which values to use, thereby mediating between the need for multiple calculations and the need to exclude erroneous results.
Data Source
AI summary
A timing signal generation device includes a GPS receiver that performs a positioning calculation based on a satellite signal; and a digital signal processor that generates position information regarding a reception point based on a value present within a range of A.+-..sigma./4 wherein A is a most frequent value or a median value of a plurality of positioning calculation results of the GPS receiver and .sigma. is a standard deviation of the plurality of positioning calculation results. A timing signal is generated based on the satellite signal from at least one position information satellite and the position information regarding the reception point.