Wet Delay Variance Estimation for Wide-Area Weather Assimilation
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Solution Overview
Problem
Existing weather data assimilation techniques, such as those described in Patent Literature 1, are not effective in accurately estimating errors in wet delays when receivers are distant from one another or lack nearby reference points, leading to inaccuracies in climate data assimilation.
Innovation Solution
A weather data assimilation assistance device that includes a wet delay calculator and a wet delay variance calculator, utilizing observable data and atmospheric delay data to calculate wet delays and their variances based on satellite clock and orbit correction values, providing accurate wet delay data and variance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If techniques from Patent Literature 1 are used to correct atmospheric delay errors, then error correction is achieved for nearby receivers, but the method becomes ineffective for wide areas where receivers are distant from one another or no other receivers are located nearby
Solution Approach 1:
The patent introduces an atmospheric delay estimation device as an intermediary that provides estimated atmospheric delay values and their variances to receivers. This mediator enables receivers in wide areas without nearby reference receivers to obtain accurate atmospheric delay corrections by utilizing the estimation device's calculations based on satellite observable data and atmospheric models.
2Quantity of substance
If wet delay is calculated using atmospheric delay data and observable data, then vapor content estimation is achieved, but error estimation accuracy is insufficient without considering covariance matrices of satellite correction values
Solution Approach 1:
The patent implements a feedback mechanism where the atmospheric delay estimation device calculates not only the estimated atmospheric delay but also its variance by incorporating the covariance matrix of satellite clock and orbit correction values. This feedback of variance information enables receivers to assess the reliability of the wet delay estimates and improve the overall accuracy of vapor content measurements.
Data Source
AI summary
A weather data assimilation assistance device includes a wet delay calculator and a wet delay variance calculator. The wet delay calculator calculates a wet delay in a satellite line-of-sight based on observable data indicating an observable of a radio wave from a positioning satellite measured by a receiver to receive the radio wave from the positioning satellite and based on atmospheric delay data indicating an atmospheric delay in the satellite line-of-sight calculated based on a correction value for at least one of a satellite clock or a satellite orbit of the positioning satellite, and outputs data indicating the wet delay. The wet delay variance calculator calculates a variance of the wet delay based on the wet delay and a covariance matrix of the correction value for at least one of the satellite clock or the satellite orbit, and outputs data indicating the variance of the wet delay.