Motion-Compensated Correlation Sequences for Weak Signal Detection
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Solution Overview
Problem
The correlation of digital signals and correlation codes is hindered by noise and multipath effects in communication channels, leading to reduced signal-to-noise ratios and positioning inaccuracies, especially in environments with weak signals and multipath conditions.
Innovation Solution
A positioning system that employs motion compensation by correlating local and received signals based on measured or assumed movement, enhancing line-of-sight signal detection and suppressing non-line-of-sight signals through motion-compensated correlation sequences, which can be stored and reused to reduce computational load and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion compensation is applied to enhance line-of-sight signal detection, then positioning accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent pre-calculates and stores motion-compensated correlation sequences for various motion states before actual signal processing. During operation, the system simply retrieves the appropriate pre-computed sequence based on measured motion, avoiding real-time complex calculations while maintaining positioning accuracy.
Solution Approach 2:
The patent applies motion compensation selectively to the correlation sequences rather than processing entire signals. By focusing computational effort only on the correlation phase with motion-compensated sequences, the system achieves positioning improvement without proportionally increasing overall computational complexity.
2Use of energy by moving object
If motion-compensated correlation sequences are stored for reuse, then power consumption is reduced, but memory requirements increase
Solution Approach 1:
The patent generates motion-compensated correlation sequences by applying motion parameters (velocity, acceleration) to standard correlation sequences. Instead of storing completely separate sequences for each motion state, the system stores base sequences and motion parameters, reducing memory requirements while enabling power-efficient reuse through parameter-based generation.
Solution Approach 2:
The patent designs correlation sequences that can serve multiple purposes: they work for both stationary and moving receivers, and can be adapted to different motion states through parameter adjustment. This universality reduces the need for separate stored sequences for each scenario, balancing memory usage with power-saving reuse capabilities.
Data Source
AI summary
A method, apparatus, computer program, and data structure relating to: causing correlation of a digital signal provided by a receiver with a motion-compensated correlation code, wherein the motion-compensated correlation code is a correlation code that has been compensated before correlation using one or more phasors dependent upon an assumed or measured movement of the receiver.