Wireless Receiver Velocity Determination via Carrier Phase Analysis
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Solution Overview
Problem
Existing wireless velocity determination systems face challenges in accurately determining velocity due to cycle slips in phase locked loops, especially under aggressive dynamics, leading to false alarms and high computational costs or low detection probability.
Innovation Solution
A wireless receiver employs a compressive sensing based approach to detect and correct cycle slips by determining carrier phase differences and using optimization procedures, such as linear programming or orthogonal matching pursuit, to determine velocity with improved robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common cycle slip detection methods are used, then cycle slip detection capability is provided, but false alarms increase under aggressive dynamics
Solution Approach 1:
The patent segments the cycle slip detection problem by separating the detection of cycle slips from the analysis of carrier phase variations. Instead of relying on methods that analyze the entire carrier phase signal (which are sensitive to aggressive dynamics), the invention uses a segmented approach that examines specific characteristics of phase locked loop operation to identify true cycle slips while ignoring false variations caused by dynamics.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a detector that monitors phase locked loop status indicators rather than directly analyzing carrier phase differences. This intermediary detector acts as a mediator between the phase locked loops and the velocity determination system, filtering out false alarms while preserving true cycle slip detection capability.
2Reliability
If simultaneous analysis of all phase locked loops is performed, then cycle slip detection probability improves, but computational cost increases
Solution Approach 1:
The patent segments the analysis by focusing detection efforts on individual phase locked loops or small groups of loops rather than performing simultaneous analysis of all loops. This segmentation reduces the computational burden while maintaining detection probability by identifying cycle slips through localized monitoring of phase locked loop status changes.
Solution Approach 2:
The patent applies partial action by implementing detection mechanisms that monitor only the necessary indicators of cycle slips in phase locked loops rather than performing exhaustive analysis of all possible phase variations. This partial monitoring approach achieves sufficient detection probability without the excessive computational cost of complete simultaneous analysis.
3Measurement precision
If carrier phase determination is performed continuously, then velocity determination accuracy is maintained, but susceptibility to cycle slips increases
Solution Approach 1:
The patent implements feedback by continuously monitoring phase locked loop status and using this information to adjust the velocity determination process. When cycle slips are detected through the phase locked loop status indicators, the system receives feedback that allows it to correct or compensate for the cycle slip effects, thereby maintaining velocity determination accuracy while being robust against cycle slips.
Solution Approach 2:
The patent applies beforehand cushioning by preparing correction mechanisms in advance that can compensate for cycle slips before they significantly impact velocity determination. The system maintains ready corrective actions based on predicted cycle slip scenarios, cushioning against the harmful effects of cycle slips while preserving continuous velocity determination accuracy.
Data Source
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AI summary
The invention relates to a wireless receiver (100) being capable of determining its velocity with respect to a number of wireless transmitters, the wireless receiver (100) comprising a communication interface (101) for receiving a number of carrier signals originating from the number of wireless transmitters, and a processor (103) being configured to determine a number of carrier phases of the carrier signals at two different time instants, to determine a number of carrier phase differences from the determined number of carrier phases for each carrier signal between the two different time instants, to determine a location matrix indicating a geometric relationship between a location of the wireless receiver (100) and a number of locations of the number of transmitters, and to determine the velocity of the wireless receiver (100) upon the basis of the number of carrier phase differences and the location matrix.