Wireless Dead Reckoning Navigation System for Land Vehicles
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Solution Overview
Problem
Current navigation systems for land vehicles, particularly in urban environments or indoors, face inaccuracies due to reliance on GNSS signals, which can be unavailable or corrupted, and require complex integration of inertial sensors that increase costs and error accumulation over time.
Innovation Solution
A Wireless Dead Reckoning (WDR) system that combines a on-wheel unit with sensors on the vehicle's wheel and an on-board unit equipped with GNSS and inertial sensors, using wireless communication and energy harvesting to provide accurate position, velocity, and time data independently of GNSS signals, without the need for vehicle connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GNSS receiver is used for positioning, then absolute position reference is provided, but positioning becomes unavailable or corrupted in urban environments, indoors, or tunnels
Solution Approach 1:
The system divides the positioning function into two independent segments: GNSS receiver for absolute positioning and inertial sensors for relative positioning. Each segment operates independently and can provide positioning information without relying on the other, ensuring continuous availability even when one system fails or is unavailable.
Solution Approach 2:
The patent combines GNSS receiver with inertial sensors (accelerometers and gyroscopes) into an integrated positioning system. The processing unit fuses data from both systems, allowing the inertial sensors to compensate for GNSS signal loss and maintain continuous positioning capability in challenging environments.
2Reliability
If inertial sensors are integrated to overcome GNSS limitations, then positioning availability is improved, but error accumulation increases over time due to complex signal integration
Solution Approach 1:
The processing unit continuously monitors and fuses data from both GNSS and inertial sensors, using the reliable component to correct or compensate for errors in the other. When GNSS signals are available, they provide absolute position references that reset inertial drift errors; when GNSS is unavailable, the inertial system maintains positioning with minimized error accumulation through optimal fusion algorithms.
3Measurement precision
If combined GNSS, gyroscope and accelerometer system is implemented, then positioning accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The inertial sensors serve multiple functions: they provide positioning information when GNSS is unavailable, compensate for GNSS errors when signals are weak, and maintain continuous attitude and velocity data. This multi-functionality reduces the need for additional specialized components, simplifying the overall system architecture while maintaining high positioning accuracy.
Data Source
AI summary
In an embodiment, a system for land vehicle navigation includes: a GNSS receiver providing GNSS data, a set of sensors positioned on a wheel of a vehicle and on board the vehicle; and a processing unit. An on-wheel unit is located on the wheel of the vehicle, the on-wheel unit including a first subset of sensors. An on-board unit includes a second subset of sensors configured to generate a second sensor data. The processing unit is configured to process the first and second sensor data to obtain the distance and the attitude of vehicle and to perform a fusion with the GNSS data.