Radar Velocity Detection via Doppler Phase Compensation
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Solution Overview
Problem
In radar systems, the use of multiple-input and multiple-output (MIMO) technology with time-division multiplexing (TDM) leads to a reduction in the maximum detectable velocity range of objects, resulting in inaccurate velocity estimation due to the Doppler effect and reduced angular resolution.
Innovation Solution
The method involves obtaining and compensating for phase shift values in reception signals from a radar sensor, using a processor to determine the Doppler effect and angle values, and then calculating the velocity of objects without reducing the maximum detectable velocity range, even with multiple transmitting antennas, by employing frequency-modulated continuous-wave (FMCW) signals and signal processing techniques like FFT and DBF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple transmitting antennas are used in MIMO radar system, then angular resolution is improved, but maximum detectable velocity range is reduced
Solution Approach 1:
The patent applies preliminary action by calculating and storing phase shift values caused by Doppler effect before angle value determination. The processor pre-calculates phase shifts based on known transmission signal characteristics and antenna positions, then compensates for these phase shifts in the reception signals before performing angle estimation. This preliminary compensation ensures that both MIMO angular resolution and velocity detection range are maintained without trade-off.
2Device complexity
If time-division multiplexing is used to enable multiple transmitting antennas, then system complexity is reduced, but Doppler effect compensation becomes inaccurate
Solution Approach 1:
The patent implements feedback by using the known characteristics of transmission signals (frequency, time interval, antenna position) to calculate expected phase shifts, then applying these calculated phase shifts as compensation to the reception signals. The system continuously adjusts the compensation based on the relationship between transmission signal parameters and observed reception signal characteristics, ensuring accurate Doppler effect compensation even with TDM operation.
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 allows for accurate velocity estimation of objects without reducing the maximum detectable velocity range, maintaining high angular resolution, and effectively compensates for the Doppler effect, ensuring reliable object velocity detection in radar systems.
Implementation Method 1
determining a Doppler effect based on the first reception signal and the second reception signal
Data Source
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AI summary
The application concerns a method and apparatus for object velocity detection in a radar system. The object velocity detection method includes: obtaining a first reception signal and a second reception signal that are received in different time intervals through a radar sensor; determining a Doppler effect based on the first reception signal and the second reception signal; determining an angle value of an object based on a signal obtained by compensating for the Doppler effect; obtaining a compensated signal by compensating for the angle value in the second reception signal; and determining a velocity of the object based on the compensated signal.