TDMA Phase Correction in Radar Object Detection
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Solution Overview
Problem
Time division multiplexing (TDMA) in radar and wireless communication systems introduces phase shifts that can skew object detection information, especially when detecting moving objects, due to unknown velocities, complicating signal processing.
Innovation Solution
A system and method that use a processor to determine the existence of a transmission timing phase shift by analyzing the relationship between covariance matrices of received signals, allowing for compensation and accurate signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDMA is used to transmit multiple signals, then the number of signals available for object detection is increased, but transmission timing phase shifts are introduced that skew detection information
Solution Approach 1:
The patent segments the detection process into distinct phases: signal transmission using TDMA, reception of signals with potential phase shifts, covariance matrix computation for each signal group, and comparison of trace values to determine phase shift existence. This segmentation allows systematic handling of phase shift issues while maintaining multiple signal transmission capability.
Solution Approach 2:
The patent changes the parameter representation by computing covariance matrices from received signals and comparing their trace values. This parameter transformation enables detection of phase shift conditions without directly measuring phase shifts, allowing accurate object detection despite TDMA-induced timing differences.
2Reliability
If TDMA is used to separate signal transmissions in time, then signal orthogonality is achieved, but additional phase shifts are introduced that complicate processing
Solution Approach 1:
The patent introduces covariance matrices as an intermediary representation between raw received signals and final detection results. By computing covariance matrices for each signal group and comparing their trace values, the system mediates the complex phase shift issues, simplifying the processing while maintaining signal orthogonality benefits.
3Ease of operation
If multiple transmitters transmit at different times, then processing difficulties are reduced through TDMA, but phase shifts related to unknown object velocity increase processing complexity
Solution Approach 1:
The patent implements a feedback mechanism where the system computes covariance matrices from received signals, compares trace values to determine phase shift existence, and uses this information to guide further processing. This feedback loop enables adaptive handling of phase shifts related to unknown object velocities, making detection more manageable despite TDMA timing differences.
Data Source
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AI summary
An illustrative example object detection system (20) includes a plurality of first transmitters (24) that respectively transmit a first signal at a first time, a plurality of second transmitters (26) that respectively transmit a second signal at a second time, a plurality of receivers (28) that receive the signals, and a processor (30) that is configured to determine whether a transmission timing phase shift exists between the received first signals and the received second signals based on a relationship between matrices including the received signals.