GPS Timing Signal Generation Using Position Mode Values
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Solution Overview
Problem
Existing GPS receivers face challenges in generating accurate timing signals due to errors in positioning calculations, especially in poor reception environments, which affects the precision of 1 PPS (one pulse per second) signals and is costly to acquire accurate position information.
Innovation Solution
A timing signal generating device that includes a positioning calculation unit, a position information generation unit, and a timing signal generation unit, which uses mode or median values from multiple positioning calculations to generate timing signals synchronously with reference time, allowing for accurate timing signals even in deteriorated reception environments and reducing costs by not being limited to specific receiving locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If positioning calculation is performed using satellite signals in poor reception environments, then position information can be acquired without surveying costs, but the precision of 1 PPS timing signals is deteriorated due to significant errors in positioning results
Solution Approach 1:
The system performs positioning calculations multiple times before generating 1 PPS timing signals to pre-acquire position information. By conducting preliminary positioning calculations and storing the results, the system can generate accurate timing signals even when current satellite signal reception is poor, thus resolving the contradiction between cost reduction and precision maintenance.
2Measurement precision
If satellite signals from many GPS satellites are received for positioning calculation, then precision of positioning results is improved, but in poor reception environments the number of receivable satellites is limited and precision is deteriorated
Solution Approach 1:
The system performs positioning calculations multiple times in advance and stores the results. When satellite signal reception is poor and fewer satellites are available, the system uses the previously stored positioning results to generate 1 PPS timing signals, thereby maintaining precision regardless of the current number of receivable satellites.
Solution Approach 2:
The system creates copies of positioning calculation results by performing multiple positioning calculations and storing them. These stored results serve as backup data that can be used when current satellite signal reception is insufficient, ensuring continuous operation with maintained precision in varying reception environments.
3Measurement precision
If map reading or surveying methods are used to acquire accurate position information, then precision of 1 PPS in position fix mode is improved, but costs including expense and time are required
Solution Approach 1:
The GPS receiver performs positioning calculations by itself using satellite signals to acquire its own position information, eliminating the need for external surveying services or map reading. The system stores multiple positioning results and uses them to generate 1 PPS timing signals, achieving both cost reduction and maintained precision through self-service positioning.
Data Source
AI summary
A timing signal generating device includes a GPS receiver and a processing unit. The GPS receiver functions as a positioning calculation unit, and receives satellite signals transmitted from GPS satellites and performs positioning calculation based on trajectory information and time information contained in the received satellite signals. Further, the processing unit functions as a position information generation unit, and generates position information of a receiving point based on a mode value or a median value in results of the positioning calculation at a plurality of times by the GPS receiver.