Dynamic Satellite Search Priority for Signal Locking
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Solution Overview
Problem
Existing satellite signal receiving devices, such as those for GPS and Quasi-Zenith Satellite Systems, face prolonged search times and increased power consumption when starting from a cold state, especially in regions where quasi-zenith satellites are not available, due to prioritizing their search over other satellite systems.
Innovation Solution
A satellite signal receiving device that includes a reception control mechanism to prioritize searching for RNSS satellites when the current location is determined to be within their reception area, reducing search time and power consumption by first seeking RNSS satellites, which have higher reception sensitivity when near the zenith, and switching to GNSS satellites if RNSS are not available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the satellite signal receiving device prioritizes searching for quasi-zenith satellites (RNSS) before GPS satellites (GNSS), then the search time and power consumption are reduced in regions where RNSS satellites are available, but the search time significantly increases in regions where RNSS satellites cannot be received
Solution Approach 1:
The patent applies dynamics by making the satellite search priority dynamic rather than fixed. The reception control means changes the search priority based on real-time determination of the user's location. When the user is in a region where RNSS satellites are available, the device prioritizes RNSS search; when moving to a region where RNSS satellites are not available, the device automatically switches to prioritizing GNSS satellite search. This dynamic adaptation resolves the contradiction between reducing search time in RNSS-available regions and maintaining versatility across different geographic regions.
Solution Approach 2:
The patent changes the parameter of satellite search priority based on geographic location. By determining whether the current location is in an RNSS service area and adjusting the search priority accordingly, the system optimizes performance for different regions. This parameter change approach allows the device to achieve short search times in Japan (RNSS priority) while maintaining adaptability to other regions (GNSS priority), thus resolving the technical contradiction.
2Use of energy by moving object
If the satellite signal receiving device always searches for RNSS satellites first, then power consumption is reduced in regions with RNSS availability, but the device becomes less adaptable when traveling to countries without quasi-zenith satellites
Solution Approach 1:
The patent makes the power consumption optimization dynamic by linking it to geographic location. The reception control means determines the user's location and adjusts the search strategy accordingly. In RNSS-available regions, prioritizing RNSS search reduces power consumption; when traveling to countries without RNSS satellites, the system automatically switches to GNSS-priority search. This dynamic approach resolves the contradiction between power efficiency and international adaptability.
3Speed
If the satellite search prioritizes RNSS satellites, then the time to lock onto a satellite is shortened in Japan, but the overall reception time increases significantly when the device is used in regions where RNSS satellites are not available
Solution Approach 1:
The patent changes the satellite search priority parameter based on geographic region. By determining whether the current location is within an RNSS service area, the system adjusts the search priority to optimize locking speed for the current region. This parameter adaptation resolves the contradiction between achieving fast satellite locking in Japan and maintaining good reception performance in other countries.
Data Source
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AI summary
A satellite signal receiving device including: a reception means that searches for positioning information satellites including GNSS satellites used in a global navigation satellite system and RNSS satellites used in a regional navigation satellite system, and receives satellite signals transmitted from a satellite locked onto by the search; a reception control means that controls the reception means; and a region determination means that determines whether or not the current location is in a region where satellite signals transmitted from RNSS satellites can be received; the reception control means prioritizing searching for an RNSS satellite when the region determination means determines the current location is in a region where satellite signals transmitted from RNSS satellites can be received.