Mode S Transponder Decoder Using Auto-Correlation Pulse Regeneration
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Solution Overview
Problem
Existing Mode S transponder transmission signal decoding methods fail to accurately decode signals due to interference from reflected waves and asynchronous signals, leading to misidentification of pulses and incorrect signal recognition.
Innovation Solution
A Mode S transponder transmission signal decoder that performs differential processing, auto correlation arithmetic operations, pulse regeneration, gate processing, and phase locked loop operations to correctly identify and decode Mode S transponder transmission signals, using a combination of differential processing, auto correlation arithmetic operations, pulse regeneration, pattern selection, and pulse position synchronization to accurately decode the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If threshold-based signal recognition is used, then simple signal detection is achieved, but signal misidentification occurs due to reflected waves and asynchronous signals
Solution Approach 1:
The patent transforms the signal processing approach by changing parameters from simple threshold-based detection to differential processing followed by auto-correlation analysis. This parameter transformation enables the system to distinguish between direct waves and reflected waves by analyzing the temporal characteristics and correlation properties of the received signal, thereby resolving the contradiction between simple detection and accurate recognition.
Solution Approach 2:
The patent introduces an intermediary processing stage between signal reception and final recognition. The differential processing unit and auto-correlation arithmetic operation unit serve as intermediaries that process the raw signal before the pulse width determination unit makes its decision. This intermediary processing layer filters out false signals caused by reflected waves and asynchronous signals, enabling accurate recognition while maintaining operational simplicity.
2Device complexity
If reflected waves are not mitigated, then signal processing remains simple, but pulse width measurement becomes inaccurate
Solution Approach 1:
The patent applies preliminary action by performing differential processing and auto-correlation analysis before the final pulse width measurement. The differential processing unit prepares the signal by removing DC components and enhancing transient characteristics, while the auto-correlation arithmetic operation unit identifies the temporal structure. This preliminary processing eliminates the influence of reflected waves before the pulse width determination unit measures the pulse width, ensuring accuracy without requiring complex real-time filtering.
3Productivity
If asynchronous signals interfere with direct waves, then signal reception remains straightforward, but signal decoding becomes incorrect
Solution Approach 1:
The patent implements feedback through the auto-correlation arithmetic operation unit, which analyzes the temporal correlation structure of the received signal. The system uses the correlation results to identify and reject asynchronous signals that do not match the expected temporal pattern of direct waves from the transponder. This feedback mechanism ensures that only correctly decoded signals are processed further, maintaining high reliability while preserving reception efficiency through automated correlation analysis.
Data Source
AI summary
There are provided a differential processing unit which performs differential processing for a Mode S transponder transmission signal, an auto correlation arithmetic operation unit which performs an arithmetic operation of a degree of auto correlation between an increasing change rate and decreasing change rate of a power level in the signal which has been subjected to the differential processing, a pulse regeneration unit which regenerates a pulse based on the degree of auto correlation, which has been obtained by the auto correlation arithmetic operation processing, a pulse phase locked loop unit which performs gate processing and phase locked processing for the regenerated pulse, and a pulse decoding unit which decodes the Mode S transponder transmission signal based on the pulse which has been subjected to the gate processing and the phase locked processing.