Multi-Sensor Module with Adaptive Integration for Navigation Accuracy
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Solution Overview
Problem
Inertial navigation systems face reduced accuracy due to changes in output stability of inertial sensors over time, as indicated by Allan variance, affecting the reliability of navigation information.
Innovation Solution
A sensor module comprising multiple sensors with aligned detection axes, integrated with signal and integration processing units, utilizes parameter information and arithmetic processing to adjust for sensor stability and integration time, optimizing arithmetic processing to maintain accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inertial sensors are used for navigation over time, then navigation information can be provided, but output stability of the sensors changes with time causing reduced accuracy
Solution Approach 1:
The patent applies dynamics by making the arithmetic processing adaptive and time-varying. The system dynamically adjusts the processing of sensor outputs based on time-dependent stability characteristics (Allan variance) of the inertial sensors. This allows the navigation system to optimize accuracy at different time scales by changing how sensor data is processed, rather than using a fixed processing approach.
Solution Approach 2:
The patent changes processing parameters based on the time-dependent stability characteristics of the sensors. By analyzing Allan variance data, the system identifies optimal processing parameters for different time intervals and applies these parameter changes to maintain navigation accuracy despite sensor drift over time.
2Ease of operation
If simple integration processing is used, then processing is straightforward, but accuracy degrades due to sensor output stability changes
Solution Approach 1:
The patent applies preliminary action by pre-analyzing the stability characteristics of inertial sensors using Allan variance before actual navigation processing. This preliminary analysis allows the system to determine optimal processing strategies in advance, so that when navigation occurs, the appropriate accuracy-maintaining processing can be applied without complex real-time adjustments.
Data Source
AI summary
A sensor module includes a plurality of sensor devices that have detection axes along a same direction and detect a same type of physical quantity, a storage unit that stores parameter information including parameters as indexes representing output stability of the respective plurality of sensor devices, a plurality of integration processing units that perform integration processing based on output signals of the respective plurality of sensor devices, and an arithmetic processing section that performs arithmetic processing according to the parameter information and integration times of the integration processing on the output signals of the plurality of integration processing units.