Satellite Field of View Segmentation for RF Signal Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low Earth Orbit (LEO) satellites face challenges in detecting Automatic Identification System (AIS) signals due to the large field of view, which results in signal collisions and reduced detection performance as the number of ships in the field of view exceeds the detection threshold, leading to inefficient AIS signal processing.
Innovation Solution
The system segments the satellite's field of view into multiple zones by mathematically combining sensor signals from multiple antennas to produce zone signals, allowing for independent processing and extraction of AIS messages, thereby reducing the number of ships in each zone below the detection threshold and enhancing detection capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the satellite uses a large field of view to cover more ships, then the coverage area is improved, but the number of signal collisions increases and detection performance deteriorates
Solution Approach 1:
The patent divides the satellite's field of view into multiple non-overlapping zones, each processed by a separate signal processing chain. This segmentation reduces the number of ships per zone below the detection threshold, eliminating signal collisions while maintaining full coverage through the combination of all zones.
2Productivity
If the satellite processes all ships in the field of view simultaneously, then the productivity is improved, but the signal collision rate increases and message recovery probability decreases
Solution Approach 1:
The field of view is segmented into multiple zones with dedicated processing chains, allowing parallel processing of multiple ship signals without collisions. This maintains high productivity while ensuring reliable message recovery in each zone.
Solution Approach 2:
Each zone is processed with optimized parameters tailored to its specific characteristics, improving the probability of recovering AIS messages in high-traffic areas while maintaining efficiency in lower-traffic regions.
3Device complexity
If the satellite uses a single processing chain for the entire field of view, then the device complexity is reduced, but the detection threshold is exceeded and signal collisions occur
Solution Approach 1:
The processing system is divided into multiple independent chains, each handling a specific zone. This segmentation prevents signal collisions by limiting each chain's workload below the detection threshold, while the overall system maintains comprehensive coverage.
Data Source
AI summary
A satellite system for detecting radio frequency signals from space including at least two sensors, a processing unit and at least one receiver. Each sensor receives a plurality of radio frequency signals containing messages and outputs a sensor signal that is representative of the plurality of radio frequency signals. The processing unit selects a predetermined number of mathematical combinations of the sensor signals and combines the sensor signals into the predetermined number of mathematical combinations to produce a plurality of zone signals. The characteristics of each zone signal are undefined at the time the predetermined number of mathematical combinations is selected. The receiver extracts the messages contained in the zone signals.