VDE Multi-Passage Channel Detection Processing System
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Solution Overview
Problem
Conventional multi-channel VHF data exchange (VDE) systems face challenges in satellite reception due to high hardware resource requirements and low signal-to-noise ratios, leading to increased demodulation complexity and resource consumption, especially in sea-air target signal reception.
Innovation Solution
A processing system comprising a burst energy detection module, frame header combining storage, high-speed frequency correlation and compensation, open-loop timing and phase detection, bi-orthogonal decoding, effective channel selection, and demodulator-group modules, which uses a double sliding window method, UTC frame head time range estimation, and fast PI/4 QPSK demodulation to reduce hardware requirements and processing delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional multi-beam receiving technology is used, then spatial segmentation is achieved, but hardware resource requirements for satellite reception and demodulation increase significantly
Solution Approach 1:
The patent segments the multi-channel reception process into distinct stages: energy detection stage, frame header detection stage, and data demodulation stage. Only channels detected to contain valid signals proceed to subsequent stages, while others are discarded. This segmentation eliminates the need for all demodulators to process all channels simultaneously, reducing hardware resources while maintaining spatial segmentation capability.
2Measurement precision
If high-performance demodulation algorithms are used for sea-air target signals, then signal detection accuracy improves, but demodulation resource consumption increases
Solution Approach 1:
The patent performs preliminary energy detection and frame header detection before full demodulation. By using simple energy thresholds and frame header patterns to pre-screen channels, the system identifies only those channels containing valid VDE signals. This preliminary action prevents high-resource demodulation algorithms from being applied to noise-only channels, significantly reducing overall resource consumption while maintaining detection accuracy for valid signals.
3Reliability
If all channels are processed through full demodulation, then no message collisions are missed, but processing delay increases
Solution Approach 1:
The patent extracts and processes only the frame header portion of each channel signal before full demodulation. The frame header contains sufficient information (sync patterns, channel identifiers) to determine whether a channel contains a valid VDE message. By taking out and processing only this critical portion, the system quickly identifies valid channels for full demodulation while discarding invalid channels early, reducing overall processing delay without missing message collisions.
Data Source
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AI summary
The invention provides a processing system for multi-channel detection based on very high frequency data exchange (VDE), including a burst energy detection module, a frame header combing storage module, a high speed frequency correlation and compensation module, an open loop timing and phase detection module, a bi-orthogonal decoding and deciding module, an effective channel selection module, a demodulator-group module, and a combined packet output module. The present invention uses the processing system for multi-channel detection based on the VDE communication protocol to greatly reduce the number of receiving demodulators and the pressure for the hardware of receiving systems. The present invention has great importance and important application prospects on the multi-channel reception of VDE sea-air target signals.