Redundant GNSS Receivers for Fast and Accurate Cold Start
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Solution Overview
Problem
There is a trade-off between the speed and accuracy of GNSS receiver cold starts in stationary nodes, with longer startup sequences leading to more accurate location determination but prolonging the initialization process.
Innovation Solution
Employing multiple GNSS receivers with different startup durations, where a first receiver initiates a fast-start sequence followed by a second receiver's longer slow-start sequence, and subsequent statistical analysis or interpolation to refine the location, potentially with repeated restarts to mitigate noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the GNSS receiver performs a longer startup sequence, then the location determination accuracy is improved, but the cold start time is increased
Solution Approach 1:
The patent applies preliminary action by performing a fast startup sequence first to obtain an initial location estimate, then subsequently performing a longer startup sequence to refine the location accuracy. This staged approach allows the system to quickly establish a baseline location and then improve it over time, resolving the contradiction between fast startup and accurate location determination.
Solution Approach 2:
The startup sequence is segmented into multiple phases: a fast startup phase that quickly establishes initial location, and a refined startup phase that improves accuracy. By dividing the startup process into segments with different duration and accuracy characteristics, the system can balance the trade-off between speed and precision.
2Productivity
If the startup sequence is shortened for faster cold start, then the cold start time is reduced, but the location determination accuracy deteriorates
Solution Approach 1:
The fast startup sequence serves as a preliminary action that quickly establishes an initial location estimate, enabling the system to become operational rapidly. This preliminary location is then refined through a subsequent longer startup sequence, allowing the system to achieve both fast initial response and eventual high accuracy.
Solution Approach 2:
The system dynamically adjusts the startup sequence duration based on operational requirements. The fast startup provides immediate location capability when speed is critical, while the refined startup provides high accuracy when precision is paramount. The system can transition between these dynamic states as needed.
Data Source
AI summary
A stationary node (e.g., telecom router/switch) having at least two GNSS receivers. When the node is powered on, both GNSS receivers perform a startup sequence with the duration of the startup sequence for the second receiver being longer than that for the first receiver. When the first receiver finishes its startup sequence, a “fast-start” location is determined, and the first receiver switches to the normal operating mode using that fast-start location. When the second receiver finishes its longer startup sequence, a “slow-start” location is determined. Because its startup sequence duration is longer, the slow-start location should be more accurate than the fast-start location. As such, the first receiver transitions from operating in the normal mode using the fast-start location to operating in the normal mode using the slow-start location, thereby achieving both fast startup and accurate location determination.