Programmable Reference Beacons for SAR Location Accuracy
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Solution Overview
Problem
Current search and rescue systems face limitations in accuracy and coverage due to the scarcity of low-cost, programmable reference beacons that can be widely deployed for precise location monitoring, especially in remote areas, and are affected by environmental conditions and interference.
Innovation Solution
The implementation of programmable reference beacons with adjustable configuration settings, capable of transmitting reference signals to Earth-orbiting satellites, which can be calibrated and updated remotely to optimize signal transmission and minimize interference, allowing for more accurate location estimation of distress signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional reference beacons are deployed, then location monitoring is provided, but the number of available reference beacons is limited and deployment in remote areas is restricted due to high cost and complexity
Solution Approach 1:
The patent implements reference beacons using low-cost, commercially available GPS receivers and transmitters that can be widely deployed in remote areas. These simplified beacons sacrifice some durability and advanced features but enable mass deployment to improve location monitoring coverage and accuracy throughout the SAR system.
Solution Approach 2:
The reference beacons are designed to operate autonomously using built-in GPS receivers that automatically acquire satellite signals and generate reference signals without requiring manual configuration or maintenance. This self-service capability reduces operational complexity and enables deployment in remote locations where regular maintenance is difficult.
2Measurement precision
If reference beacons transmit at regular time intervals with known signal signatures, then signal differentiation is achieved, but radio interference limits the maximum tolerable level and reduces system accuracy
Solution Approach 1:
The patent implements dynamic signal signature assignment where reference beacons are configured with unique or varying signal characteristics rather than static signatures. This dynamic approach allows the system to adapt signal parameters to minimize interference and improve measurement precision under different operational conditions.
Solution Approach 2:
The system changes signal parameters such as frequency, time interval, and signature patterns to optimize reference signal transmission. By varying these parameters, the system can differentiate reference signals from distress signals more effectively and reduce the impact of radio interference on measurement accuracy.
3Productivity
If the beacon locating process uses traditional methods, then location estimation is provided, but the process time is approximately 45 minutes which is too slow for effective search and rescue operations
Solution Approach 1:
The patent implements preliminary calibration of the SAR system using reference beacons with known GPS locations. By pre-establishing accurate calibration factors through systematic reference signal transmission and processing, the system eliminates the need for time-consuming iterative location determination during actual distress events, reducing locating time from 45 minutes to approximately one minute.
Solution Approach 2:
The system replaces traditional mechanical search and rescue coordination methods with automated electronic signal processing. By using electronic calibration factors derived from reference beacons and GPS satellite signals, the system automatically calculates distress beacon locations without manual intervention, dramatically improving locating speed and productivity.
4Reliability
If second-generation distress beacons include confirmation response capability, then help deployment verification is improved, but system calibration requirements become more complex and time-consuming
Solution Approach 1:
The patent uses reference beacons that transmit signals identical in format and structure to distress beacons, allowing the system to practice calibration using copies of the actual distress signal format. This copying approach simplifies calibration by using familiar signal patterns and reduces the complexity of calibrating second-generation beacons with confirmation response capability.
Data Source
AI summary
Search and rescue (SAR) systems utilizing Earth-orbiting satellites are provided. In one implementation, a SAR system comprises a plurality of reference beacons, each having a known geographical location, and a ground-based station. The ground-based station includes one or more antennas for communicating with the reference beacons via a plurality of Earth orbiting satellites. The ground-based station is configured to receive reference signals from each of the reference beacons and calculate estimates of the locations of the reference beacons from the received reference signals. Also, the ground-based station is configured to calculate system calibration factors based on the location estimates and known geographical locations of the reference beacons. The ground-based station is further configured to receive distress signals from at least one distress beacon via the Earth-orbiting satellites and calibrate the distress signals based on the system calibration factors.