GPS Satellite Transceiver Adaptive Transmission Frequency
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Solution Overview
Problem
Satellite telecommunications devices face challenges in reducing battery power consumption, particularly when stationary for extended periods, as users often forget to turn off the system, leading to unnecessary power usage and airtime costs.
Innovation Solution
A mobile communication device that periodically calculates its position using GPS signals and transmits this information through a communication satellite system, entering an idle mode if no significant movement is detected, reducing transmission frequency and conserving power by transmitting at a lower frequency when stationary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system transmits position signals continuously at a high frequency, then the position monitoring accuracy is improved, but the battery power consumption increases
Solution Approach 1:
The transmission frequency is made dynamic rather than static. The system automatically adjusts the transmission frequency based on the detected movement state - using high frequency when movement is detected and low frequency when stationary. This resolves the contradiction by making the system adaptable to different operational conditions.
Solution Approach 2:
The transmission frequency parameter is changed based on the operational state. The system switches between a first transmission frequency (higher) and a second transmission frequency (lower) depending on whether movement is detected. This parameter adjustment resolves the contradiction between maintaining monitoring accuracy and reducing power consumption.
2Loss of information
If the system maintains continuous high-frequency transmission, then the position information is always up-to-date, but the airtime usage increases
Solution Approach 1:
The transmission frequency is dynamically adjusted based on movement detection. When the device is stationary, the system switches to lower transmission frequency, reducing airtime usage while maintaining sufficient position information updates. When movement is detected, frequency increases to ensure position information remains current.
Solution Approach 2:
The system uses periodic movement detection to determine transmission frequency. Instead of continuous high-frequency transmission, the system periodically checks for movement and adjusts transmission accordingly, reducing overall airtime usage while maintaining position information quality.
3Use of energy by moving object
If the user manually turns off the system when stationary, then the power consumption is reduced, but the ease of operation decreases
Solution Approach 1:
The system performs self-service by automatically detecting when it is stationary and switching to low transmission frequency mode without requiring user intervention. The movement detection and frequency adjustment are automated, eliminating the need for users to manually turn the system off while still achieving power conservation.
Solution Approach 2:
The system uses feedback from movement detection to automatically adjust transmission frequency. The position calculation results provide feedback about whether the device has moved, and this feedback triggers automatic frequency adjustment, resolving the contradiction between power saving and user convenience.
Data Source
AI summary
A mobile communication device includes a GPS system and a communication system through a low-earth orbit communication satellites or geosynchronous satellite. The processing system periodically calculates from GPS a current position which is compared to a saved position and saved if the amount of movement is greater than a set distance and also transmits each calculated position. In order to reduce power consumption, in the event that at least one and preferably several calculated differences between the current position and the previously saved position is less than the predetermined set distance, the processing system is placed in an idle mode in which position is transmitted at a lower frequency. The position is periodically calculated and as soon as the position changes the system is returned from idle. In order to keep remote recipients informed signals indicating entry into and return from the idle mode are transmitted with the position signals.