Vehicle Telemetry Delta Encoding for Flight Recorder Data Limits
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Solution Overview
Problem
Aircraft flight recorders struggle to record and transmit the vast amount of telemetry data from numerous sensors due to limited capacity and impracticality of transmitting all data, leading to incomplete data sets that can hinder accident investigation and maintenance predictions.
Innovation Solution
A data processing device that samples data from multiple sensors, generates sets of sampled values at different times, derives data elements indicating changes between these values, encodes these elements, and transmits them to a remote unit for decoding and recovery of original sampled values, optimizing data transmission and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all measurement data from numerous sensors is recorded and transmitted, then data completeness is improved, but data transmission capacity and storage requirements worsen
Solution Approach 1:
The patent extracts only the essential information from the raw sensor data by calculating difference values between consecutive samples. Instead of transmitting all original measurement data, only the changes (differences) are transmitted, which significantly reduces data volume while preserving the ability to reconstruct complete information at the receiving end.
Solution Approach 2:
The patent transforms the data representation from absolute values to difference values (relative changes). This parameter transformation reduces the amount of data that needs to be transmitted and stored, while the receiving system can reconstruct the original complete dataset by accumulating these difference values.
2Loss of energy
If data is compressed and archived on ground-based storage, then transmission requirements are reduced, but real-time analysis capability worsens
Solution Approach 1:
The patent performs preliminary processing of the data on the aircraft before transmission. By calculating difference values and preparing the data in a compressed format while in flight, the system reduces the energy required for ground-based transmission and enables faster real-time analysis upon receipt, as the data is already in a processed, compact form.
3Adaptability or versatility
If flight recorder capacity is increased to store more data types, then data coverage is improved, but device complexity and cost worsen
Solution Approach 1:
The patent creates a universal data processing approach that can handle multiple sensor types and data formats through a single difference-calculation mechanism. The system processes various measurement data (temperature, pressure, altitude, etc.) using the same algorithmic approach, making the recorder adaptable to different data types without requiring complex specialized storage for each type.
Data Source
AI summary
A data processing device for processing telemetry data obtains sampled data based on output data from a plurality of sensors associated with a vehicle. The data processing device generates first and second sets of sampled values using the sampled data. The first set of sampled values are associated with a first sampling time and the second set of sampled values are associated with a second, subsequent sampling time. The data processing device derives a set of data elements, a data element being indicative of a measure of a change between a sampled value in the first set and a corresponding sampled value in the second set, a position of a given data element in the set of data elements having been determined based on at least one mapping rule. The data processing device encodes the set of data elements and outputs data comprising at least the encoded set of data elements for transmission to a remote data processing unit.