ADS-B Ground Station Scheduling Reduces Broadcast Duplication
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Solution Overview
Problem
The existing ADS-B system experiences high levels of broadcast duplication due to multiple ground stations transmitting the same messages, leading to interference and decreased quality of air traffic communications in crowded airspaces.
Innovation Solution
The system optimizes ground station message broadcasts by separating stations into two groups based on reception quality and determining relevant customers for each target, ensuring that only necessary messages are transmitted from stations with satisfactory reception to customers who need them, thereby reducing duplication and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple ground stations broadcast messages to ensure all customers receive information, then coverage reliability is improved, but broadcast duplication increases causing interference and decreased communication quality
Solution Approach 1:
The patent applies local quality by assigning different broadcast responsibilities to different ground stations based on their specific coverage characteristics. Each ground station broadcasts messages for specific customers within its coverage area, rather than all stations broadcasting to all customers. This localized assignment reduces duplication while maintaining comprehensive coverage, as each broadcast is tailored to the specific local needs of customers in that station's service area.
Solution Approach 2:
The patent segments the broadcast function by dividing the customer base into groups, where each group is assigned to specific ground stations based on coverage area. This segmentation prevents unnecessary duplication by ensuring that only ground stations responsible for particular customers broadcast messages to them. The system divides the overall broadcast task into discrete segments assigned to individual stations, reducing overall interference while maintaining reliability.
2Loss of information
If all ground stations broadcast all target information to ensure complete information delivery, then information completeness is improved, but communication spectrum congestion increases
Solution Approach 1:
The patent implements local quality by having each ground station broadcast only the subset of target information relevant to its specific customer group. Rather than all stations broadcasting all target data, each station transmits locally-relevant information based on its coverage area and assigned customers. This reduces the total quantity of broadcast messages in the spectrum while ensuring each customer receives complete information for its local targets.
Solution Approach 2:
The patent extracts and transmits only the necessary portion of target information that each ground station is responsible for broadcasting to its assigned customers. By taking out and transmitting only the relevant subset of information rather than complete data sets from all stations, the system reduces overall spectrum congestion while maintaining information completeness for each customer group.
3Area of stationary object
If ground stations broadcast to all customers to ensure universal coverage, then coverage area is improved, but message duplication and interference worsen
Solution Approach 1:
The patent segments the coverage area into distinct zones, each served by specific ground stations. Rather than all stations broadcasting to all customers across the entire area, the system divides the coverage area into segments with designated responsible stations. This segmentation reduces message duplication by ensuring each customer receives broadcasts only from its assigned station, while collectively all stations provide universal coverage.
Solution Approach 2:
The patent applies local quality by having each ground station responsible for specific geographic areas and customer groups within those areas. Each station optimizes its broadcasts for its local coverage zone rather than attempting universal coverage. This localized approach reduces duplication while maintaining comprehensive coverage across the entire service area through coordinated local broadcasts.
Data Source
AI summary
System and methods for reducing redundant messages broadcast in an Automatic Dependent Surveillance-Broadcast (ADS-B) system. For a given target, a controller determines the relevant customers that should receive information about the target, identifies all of the ground stations that can be satisfactorily heard by the relevant customers, and then identifies a smaller subset of ground stations by selecting only those ground stations that are needed to reach all of the relevant customers. ADS-B messages are then broadcast to the relevant customers using only the smaller subset of ground stations.