GPS Ephemeris Update via Network Interface
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Solution Overview
Problem
Traditional GPS systems require a lengthy 'cold start' process for updating ephemeris data, which can take from 45 seconds to 2 minutes and becomes invalid after four hours, necessitating frequent updates, especially in areas with poor satellite signal reception, and relies on costly telecommunication services for AGPS updates.
Innovation Solution
A method for automatically downloading and updating GPS ephemeris data from a GPS ephemeris data server using a network interface, such as a wireless or Bluetooth connection, once the data becomes invalid, allowing the navigation device to search for satellites more efficiently and reducing update time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS ephemeris data is downloaded through GPS antenna from satellites, then positioning can be performed, but the process takes 45 seconds to 2 minutes (cold start time)
Solution Approach 1:
The patent pre-downloads GPS ephemeris data from satellites through GPS antenna during periods when positioning is not needed, storing it locally in the navigation device. This preliminary action ensures that when positioning is required, the device already has valid ephemeris data available, eliminating the 45-120 second cold start delay and enabling immediate positioning without needing to wait for satellite signal acquisition and data download.
2Reliability
If GPS ephemeris data is updated periodically, then positioning accuracy is maintained, but significant time is lost during each update
Solution Approach 1:
The patent implements an automatic update mechanism that monitors the validity period of stored ephemeris data and automatically initiates downloads from GPS satellites when data approaches expiration. This self-service approach maintains positioning accuracy by ensuring fresh ephemeris data is always available, while minimizing user-perceived time loss since updates occur automatically in the background without requiring user intervention or interrupting normal device operation.
3Loss of time
If AGPS is used to update ephemeris data through telecommunication services, then update time is reduced, but service costs increase
Solution Approach 1:
The patent utilizes freely available GPS satellite signals and open internet connectivity to download ephemeris data, replacing costly proprietary AGPS telecommunication services. By leveraging free resources (GPS satellite broadcasts and public internet infrastructure), the system achieves rapid ephemeris updates without incurring service charges, effectively using low-cost or free data sources instead of expensive dedicated services.
4Adaptability or versatility
If GPS positioning is performed in areas with poor satellite signal reception, then positioning may be impossible, but no alternative solution is provided
Solution Approach 1:
The patent pre-acquires and stores GPS ephemeris data during periods when satellite signals are available, creating a local database of orbital parameters. In areas with poor or no satellite signal reception, the device can still perform positioning calculations using the pre-stored ephemeris data combined with local GPS signal fragments or alternative positioning methods, thereby extending positioning availability to previously unserviceable areas.
Data Source
AI summary
The present invention provides a method for updating GPS ephemeris data, which is applicable to a navigation device containing a GPS ephemeris data. The method for updating GPS ephemeris data includes the following steps: first, the navigation device counting down a predetermined time; next, searching a GPS ephemeris data server through a network interface; then performing a download from the GPS ephemeris data server so as to update the GPS ephemeris data in the navigation device. Accordingly, the time required for updating ephemeris data is shortened.