Doppler frequency-based 77G vehicle-mounted radar data quick clustering method

A technology of Doppler frequency and vehicle radar, which is applied in the field of signal and information processing, can solve the problems of increased computing time and inconformity with the real-time processing data of vehicle radar, and achieve good clustering and differentiation effects

Active Publication Date: 2020-03-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

If the Doppler frequency is directly added to the clustering operation and the traditional method is used to find the optimal number of clusters, the calculation time will increase due to the increase in the calculation amount, which does not meet the requirements of real-time data processing of the vehicle radar

Method used

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  • Doppler frequency-based 77G vehicle-mounted radar data quick clustering method
  • Doppler frequency-based 77G vehicle-mounted radar data quick clustering method
  • Doppler frequency-based 77G vehicle-mounted radar data quick clustering method

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Embodiment Construction

[0037] The 77GHz vehicle radar data is classified by using the fast clustering method of 77GHz vehicle radar based on Doppler frequency.

[0038] Establish a plane Cartesian coordinate system in the space, assuming that there are five targets in the space, and generate Gaussian distribution simulation data, their position (X, Y) (m), speed S (m / s), and data scale information are shown in the following table , where target 1 and target 2 are closer to each other with different Doppler frequencies, and target 1 and target 4 have the same Doppler frequency but different positions. Raw data such as figure 1 shown.

[0039] Step 1: The total data size N is 250, and the search range for the estimated optimal number of clusters is set [k min ,k max ], where the minimum number of clusters k min is 2, the maximum number of clusters k max for Round down to 15. Set the clustering cut-off threshold T to 5. It means that the clustering is stopped when the size of the intra-class po...

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Abstract

The invention discloses a Doppler frequency-based 77G vehicle-mounted radar data quick clustering method, and belongs to the field of radar data processing. The invention provides a method for performing three-dimensional clustering by using Doppler frequency information and reducing the operation time consumption by using a threshold-based optimal clustering number determination method, so that the clustering accuracy is improved and the operation time is reduced. Clustering process, clustering is carried out by using the target spatial position and Doppler frequency three-dimensional information; a relatively close position can be effectively distinguished; different targets with different Doppler frequencies exist; the optimal clustering number is searched; clustering thresholds according to settings, when the clustering number is traversed to calculate the clustering result and the evaluation function, corresponding calculation is stopped if the number of points in a certain classin the clustering result is smaller than a threshold value, the optimal clustering number and the optimal clustering result are obtained according to the maximum value of the evaluation function, increase of calculation time caused by increase of operation dimensions is reduced, and clustering accuracy and operation efficiency are improved.

Description

technical field [0001] The invention is a data clustering algorithm suitable for 77GHz vehicle-mounted millimeter-wave radar. It belongs to the field of signal and information processing. Background technique [0002] Millimeter wave radar, the working frequency range is 30GHz-300GHz, and its wavelength is between 1mm-10mm. It has the advantages of small radar device size, low power consumption, high speed and range measurement accuracy, long detection distance, narrow radar beam, and high angular resolution. The advantages of high frequency, wide frequency, and strong anti-interference ability make millimeter-wave radar one of the indispensable sensors in automotive ADAS technology. As a 77GHz millimeter-wave radar, its volume and power consumption are smaller, its detection distance is longer and its detection accuracy is higher, making the 77GHz millimeter-wave radar sensor a new generation of automotive sensors. [0003] Due to its high precision, the 77GHz vehicle-mou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/72G01S13/931G06K9/62
CPCG01S13/723G01S13/931G06F18/23213Y02A90/10
Inventor 周云闫帅程浴晟黄志明邹林汪学刚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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