GPS Receiver Satellite Clock Correction Using Velocity and Location

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Solution Overview

Problem

GPS receivers face challenges in accurately determining location due to errors in satellite clock measurement, which are not corrected for satellite velocity and location information, leading to inaccuracies in pseudo-range calculations.

Innovation Solution

A GPS receiver system that includes a satellite signal receiving part, a decoder, a satellite location determining part, and a satellite clock correcting part, which calculates satellite velocity and corrects the satellite clock using Doppler values and location information, thereby improving location determination accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If satellite clock measurement is performed using only navigation data from GPS signals, then the measurement process is simple, but location determination accuracy deteriorates due to uncorrected satellite clock errors

Engineering Contradiction:

Improvesatellite clock measurement processVSAvoidlocation determination accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces satellite velocity and location information as intermediary parameters to correct satellite clock errors. The satellite clock correcting part uses these intermediary data to calculate clock errors and generate correction values, which are then applied to improve the accuracy of location determination without complicating the overall measurement process

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If satellite clock errors are not corrected using satellite velocity and location information, then the system remains simple, but pseudo-range calculations become inaccurate

Engineering Contradiction:

Improvesatellite clock correction systemVSAvoidpseudo-range calculation accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements a feedback mechanism where satellite velocity and location information are continuously used to calculate and correct satellite clock errors. The corrected clock information is fed back into the pseudo-range calculation process, ensuring continuous improvement of measurement accuracy while maintaining system simplicity

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system reduces location errors by accurately correcting satellite clock errors, resulting in more precise pseudo-range calculations and improved GPS location determination.

Implementation Method 1

calculate a velocity of the at least one satellite and to correct a satellite clock based on at least one of the calculated satellite velocity and the location of the at least one satellite

Methodology Applied

Scientific EffectTime Dilation: Time Dilation

Data Source

PatentUS8305263B2Global positioning system receiver and satellite clock correcting method thereof

Publication Date: 2012.11.06 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is a global positioning system receiver which comprises a satellite signal receiving part constructed and arranged to extract navigation data from a satellite signal received from at least one satellite; a decoder constructed and arranged to decode the navigation data; a satellite location determining part constructed and arranged to determine a location of the at least one satellite according to the decoded navigation data; and a satellite clock correcting part constructed and arranged to calculate a velocity of the at least one satellite and to correct a satellite clock based on at least one of the calculated satellite velocity and the location of the at least one satellite.