Modular Center-Fed Reflector Antenna for Spacecraft
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Solution Overview
Problem
The integration of active electronics on the tower assembly in deployable center-fed reflector antennas complicates spacecraft testing, as the antenna assembly must be mounted during testing, leading to increased costs and schedule delays, and the need for partial disassembly and reassembly, which complicates the testing process.
Innovation Solution
The tower assembly is decoupled from the reflector assembly, allowing it to be integrated and tested separately from the space vehicle, with the hub ring engirdling the feed tower to facilitate deployment of the reflector ribs, enabling full-system electronics testing without the reflector assembly present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna assembly is mounted during spacecraft testing, then complete system testing can be performed, but integration complexity and test scheduling difficulty increase
Solution Approach 1:
The antenna system is divided into separate modular components: the feed tower assembly and the reflector assembly. This segmentation allows each module to be tested independently before final integration, reducing overall integration complexity while maintaining testing completeness.
Solution Approach 2:
The feed tower assembly is tested and validated in advance before being integrated with the reflector assembly. This preliminary testing ensures that all electrical connections and functions are verified prior to final assembly, simplifying the overall testing schedule and reducing integration complexity.
2Reliability
If the antenna assembly is mounted during spacecraft testing, then complete system testing can be performed, but test schedule time increases
Solution Approach 1:
The feed tower assembly undergoes complete electrical testing and validation before integration with the reflector. This advance preparation eliminates the need for time-consuming on-site troubleshooting during final assembly, reducing overall test schedule time while maintaining testing completeness.
Solution Approach 2:
By dividing the antenna into separable modules, each can be tested in parallel or sequentially without requiring complete assembly. This modular approach reduces the total time required for system testing compared to testing a fully integrated antenna.
3Ease of operation
If the antenna assembly is disassembled and reassembled, then testing can be simplified, but assembly complexity increases
Solution Approach 1:
The antenna is designed as separable modular units with standardized interfaces. The feed tower and reflector assembly can be easily disconnected and reconnected using simple mechanical and electrical interfaces, reducing assembly complexity despite multiple assembly/disassembly cycles.
Solution Approach 2:
The modular design creates universal interfaces that can accommodate different testing configurations. The same standardized connections are used for both operational and testing modes, simplifying the assembly process even when multiple assembly/disassembly cycles are required.
Data Source
AI summary
Antenna system includes an elongated antenna feed tower structure having a tower base at one end which includes a plurality of feet arranged to align with a plurality of predetermined structural mounting points associated with a space vehicle bus. The antenna system also includes a deployable reflector assembly comprising a hub ring. The hub ring includes a reflector deployment mechanism around which a plurality of reflector ribs are disposed. The hub ring is advantageously arranged to engirdle the feed tower assembly. As such, the central aperture is configured to receive the feed tower assembly therein after the feed tower has already been mounted to the space vehicle.