GPS Receiver Timing Delay for Camera Interference
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Solution Overview
Problem
Satellite positioning systems, such as GPS, face interference from camera electronics during image capture, leading to inaccurate or impossible position fixes due to electromagnetic interference, which complicates the design and operation of camera-GPS subsystem interactions.
Innovation Solution
Introducing a delay between image capture and GPS signal sampling to minimize interference, with the duration of the delay being adjustable based on camera parameters or measured interference levels, allowing for flexible customization to optimize GPS reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS signal sampling is performed immediately after image capture, then the position fix timing is accurate, but electromagnetic interference from camera electronics disrupts GPS signal reception
Solution Approach 1:
The system performs preliminary action by delaying the GPS signal sampling until after the camera electronics have finished generating electromagnetic interference. The delay mechanism waits for a predetermined period after image capture before initiating GPS signal acquisition, ensuring that the harmful electromagnetic interference has ceased before the GPS receiver attempts to sample signals.
Solution Approach 2:
A delay mechanism acts as an intermediary between the image capture trigger and the GPS signal sampling operation. This intermediary component coordinates the timing between the camera subsystem and GPS receiver, inserting a time buffer that allows the camera electronics to complete their interference-generating operations before the GPS receiver becomes active.
2Object-affected harmful factors
If a delay is introduced between image capture and GPS signal sampling, then electromagnetic interference is reduced, but the position fix is no longer synchronized with the photograph timing
Solution Approach 1:
The system performs preliminary action by delaying the GPS signal sampling until after the camera electronics have finished generating electromagnetic interference. The delay mechanism waits for a predetermined period after image capture before initiating GPS signal acquisition, ensuring that the harmful electromagnetic interference has ceased before the GPS receiver attempts to sample signals.
3Device complexity
If a fixed delay is used, then the system design is simple, but it cannot adapt to different camera models with varying interference characteristics
Solution Approach 1:
The delay period is made dynamic rather than fixed. The system adjusts the delay duration based on camera-specific parameters such as model, flash usage, and capture mode. This dynamic adaptation allows the GPS receiver to optimize its signal sampling timing for each camera model's specific interference characteristics, improving compatibility without requiring completely different hardware designs.
Solution Approach 2:
The system changes the delay parameter based on camera characteristics. By modifying the delay duration according to camera model, flash configuration, and image capture mode, the system adapts to different interference profiles while maintaining the same fundamental hardware architecture and signal processing approach.
4Adaptability or versatility
If the delay duration is manually adjustable, then flexibility is improved, but the ease of operation decreases due to additional configuration steps
Solution Approach 1:
The system performs self-service by automatically determining the optimal delay duration based on camera parameters. The GPS receiver autonomously configures the delay period using camera-specific information such as model, flash usage, and capture mode, eliminating the need for manual user configuration while maintaining adaptability to different camera characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces electromagnetic interference, improving the accuracy and reliability of GPS position fixes by ensuring clear satellite signal reception, even in scenarios where camera electronics generate significant noise, and simplifies the design of camera-GPS subsystem interactions.
Implementation Method 1
Satellite positioning systems, such as the Global Positioning System (GPS), enable a receiver to calculate its position based on the measured time of arrival of signals from a set of orbiting satellites.
Implementation Method 2
The noise created by the camera electronics may make the position fix more difficult or impossible to achieve, or it may simply decrease the accuracy of the result.
Data Source
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AI summary
A method of receiving satellite signals for estimating the location of capture of a photographby a camera.The method comprises receiving a signal relating to the timing ofcapture of the photograph;waiting for an interval of non-zero duration; and,after the interval, receiving the satellite signals.