Vehicle GPS Delay Compensation for Real-Time State Estimation
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Solution Overview
Problem
Current GPS receivers in vehicles experience long and variable delays in signal reception, leading to measurement uncertainties and inaccuracies in vehicle state estimation, particularly in low traction conditions, and traditional systems lack real-time diagnostics to address these issues.
Innovation Solution
A control system that includes a measurement comparison module to determine GPS measurement delays and uncertainties, using sensors like wheel speed and inertial measurement units to synchronize GPS data with sensor-based estimates, and perform diagnostics and control operations based on these corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If GPS receiver is used to obtain vehicle state parameters, then measurement coverage is improved, but measurement precision deteriorates due to long and variable delays
Solution Approach 1:
The system continuously compares GPS-derived velocity with sensor-based velocity estimates and uses this feedback to dynamically adjust the delay compensation. The measurement comparison module generates a delay signal based on the discrepancy between GPS measurements and sensor measurements, which is then fed back to compensate for GPS signal delays in real-time, thereby maintaining measurement precision while preserving the broad coverage benefit of GPS.
Solution Approach 2:
The system changes the time parameter by introducing dynamic delay compensation based on the calculated delay signal. By adjusting the timing of GPS measurements to account for variable delays, the system transforms the problematic time-varying delay into a compensated parameter, thereby improving measurement precision without sacrificing GPS coverage.
2Device complexity
If GPS measurement delays are not compensated, then system complexity is reduced, but reliability deteriorates due to measurement uncertainties
Solution Approach 1:
The measurement comparison module acts as an intermediary that bridges GPS measurements and sensor-based estimates. It calculates the delay between these two sources and generates a delay signal that compensates for GPS timing errors. This intermediary component adds minimal complexity while significantly improving reliability by ensuring accurate synchronization between different measurement sources.
3Measurement precision
If GPS delay compensation is implemented in real-time, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system merges the delay compensation function with the existing measurement comparison module that already exists for comparing GPS and sensor measurements. By combining the delay calculation and compensation functions within this existing module rather than adding separate dedicated components, the system achieves real-time delay compensation with minimal increase in overall device complexity.
4Ease of operation
If GPS signals are used without delay compensation, then ease of operation is maintained, but loss of information increases due to measurement inaccuracies
Solution Approach 1:
The system implements self-service by automatically calculating and compensating for GPS delays using its own internal measurement comparison capabilities. The measurement comparison module autonomously generates delay signals based on the discrepancy between GPS and sensor measurements, and this compensation is automatically applied without requiring external intervention. This maintains ease of operation while preventing information loss through accurate delay correction.
Data Source
AI summary
A control system for a vehicle includes: at least one parameter module configured to receive at least one sensor signal from at least one sensor and generate at least one parameter signal; a measurement comparison module configured to receive a measurement signal from a global position system receiver and the at least one parameter signal, and based on the measurement signal and the at least one parameter signal, determine delay in the measurement signal and generate a delay signal indicative of the delay; and at least one parameter consuming and control module configured to controlling at least one operation of the vehicle based on the delay.