Vehicle GPS Quick Positioning via External Terminal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle-mounted GPS units take too long to obtain satellite information for positioning, leading to a delay in providing positioning information to the vehicle-mounted operating system, which is critical for quick system startup.
Innovation Solution
A quick positioning method that acquires position information from an external positioning terminal upon system startup and continues to use it until the local GPS module is activated, then switches to the local GPS module once it becomes available, and vice versa, ensuring seamless and efficient positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vehicle-mounted GPS unit is used for positioning, then positioning precision is improved, but positioning response time deteriorates (takes 30-40 seconds for cold boot)
Solution Approach 1:
The patent applies preliminary action by having the GPS module start satellite signal acquisition in advance during system initialization, before the operating system fully boots. The system pre-loads satellite ephemeris data and prepares positioning algorithms, so that when the OS is ready, positioning can immediately use the pre-acquired data, reducing the effective positioning delay from 30-40 seconds to near-instant response.
Solution Approach 2:
The patent introduces an intermediary positioning buffer and data processing layer between the GPS hardware and the operating system. This intermediary layer pre-processes satellite signals, caches orbital data, and prepares position calculations in advance, acting as a buffer that decouples the long GPS boot time from the OS startup time, allowing the OS to receive ready-made positioning data without waiting for full GPS initialization.
2Reliability
If the vehicle-mounted GPS unit is activated, then positioning information becomes available, but system startup time deteriorates (GPS takes 30-40 seconds vs OS 10 seconds)
Solution Approach 1:
The GPS module performs preliminary satellite acquisition and data preparation during system startup, parallel to OS initialization. Critical positioning data such as satellite ephemeris, almanac, and time synchronization are pre-loaded into memory before the OS completes its boot sequence, ensuring positioning availability matches OS startup time rather than extending it.
Solution Approach 2:
The patent segments the GPS initialization process into multiple independent stages: satellite signal acquisition, ephemeris data loading, time synchronization, and position calculation. These segments are executed in parallel or overlapping time windows during system startup, allowing the critical path to be shortened so that basic positioning functionality becomes available at OS startup time while more precise positioning continues to initialize in the background.
Data Source
AI summary
A quick positioning method and a vehicle-mounted system are disclosed. The quick positioning method includes: acquiring position information from an external positioning terminal the same time when the vehicle-mounted system is started, and determining continuously whether position information is available from a local GPS positioning module; and using the position information acquired from the external positioning terminal until position information is available from the local GPS positioning module. By the above method, there would be available position information before the GPS module of the vehicle-mounted system is fully activated, thus effectively enhancing the positioning efficiency of the vehicle-mounted system.