Vehicle Image Capture Using Interference Signal Timing
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Solution Overview
Problem
Existing methods fail to accurately identify and image vehicles carrying sources of interference that impair GNSS receivers, such as jamming signals, due to uncertainties in signal strength and location, making it difficult to correlate fault detection with vehicle identification.
Innovation Solution
A method and system using signal detection devices to record interference signal strength time profiles, determining optimal times for image capture, and processing these profiles to generate precise images of vehicles carrying interference sources, allowing for accurate identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a signal detection device detects interference signals from a motor vehicle, then the position of the interference source can be determined, but it remains unclear how to accurately correlate the interference detection time with the image capture time to identify the correct vehicle
Solution Approach 1:
The system continuously monitors the received signal strength and uses this feedback to dynamically determine the optimal image capture time. The signal strength-time profile provides real-time information about the vehicle's position relative to the detection device, enabling precise timing of the image capture to coincide with the vehicle's location at the interference source position
Solution Approach 2:
The received signal strength-time profile acts as an intermediary that bridges the gap between interference detection and vehicle identification. By analyzing this profile, the system can determine the exact time when the vehicle was at the detected position, thereby correlating the interference event with the correct vehicle image
2Measurement precision
If the interference signal strength is used to determine vehicle position, then location can be estimated, but no threshold value can be defined that is relevant for a specific location since the intensity is generally unknown
Solution Approach 1:
Instead of using a fixed threshold value, the system changes the parameter from absolute signal strength to relative signal strength profile shape. By analyzing the temporal evolution of the signal strength and its characteristic profile during vehicle passage, the system can identify the vehicle's position without needing to know the absolute intensity or define location-specific thresholds
3Ease of operation
If an image recording device captures images of motor vehicles, then vehicle identification is possible, but it is difficult to assign the recorded image to the specific vehicle carrying the interference source
Solution Approach 1:
The system performs preliminary analysis of the signal strength-time profile to determine the optimal image capture time before actually capturing the image. This preliminary action ensures that when the image is taken, the vehicle is at the correct position corresponding to the interference source, thereby establishing the correct association between the image and the interfering vehicle
Data Source
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Figure 2c
AI summary
The invention relates to a method for the image capture of a motor vehicle (10) carrying an interference source (12) which is suitable to impair the intended function of a radio signal receiver, by means of at least one signal capture device (70) and at least one image capture device (30), comprising the following steps: capturing an interference signal from the interference source (12) and recording at least one time course of a received signal strength of the interference signal by means of the signal capture device (70);Determining, based on the recorded time course of the received signal strength, at least one optimal time point or at least one optimal time range at which the motor vehicle (10) carrying the interference source (12) assumes a position relative to the image acquisition device (30) that enables the identification of the motor vehicle (10) by means of an image of the motor vehicle (10) generated by the image acquisition device (30) at the optimal time point or within the optimal time range, using a received signal strength-time course processing device; generating an image of the motor vehicle (10) or of a motor vehicle area of the motor vehicle (10) at the optimal time point or within the optimal time range using the image acquisition device (30). The invention further relates to a corresponding system for image acquisition of the motor vehicle (10).