A method for removing multipath interference in tunnel tracks based on zero Doppler clutter points

By utilizing millimeter-wave radar's zero-Doppler clutter point and digital beamforming technology, targets and multipaths in tunnels can be separated in real time, solving the problem of multipath interference in tunnels, forming continuous target tracks, reducing costs and improving efficiency.

CN116299218BActive Publication Date: 2026-05-26XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIDIAN UNIV
Filing Date
2023-03-31
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies struggle to efficiently remove targets and multipath interference in tunnels, especially under poor lighting conditions or when the tunnel width is unknown. They are costly and inefficient, and it is difficult to distinguish targets from multipath interference based on distance and Doppler dimensions.

Method used

Real-time observation of moving targets is acquired using millimeter-wave radar. Zero Doppler channel clutter points are utilized, and digital beamforming is combined to form DBF scanning. Signal areas and multipath areas are acquired only through echo data. Multipath interference in the track is removed in real time based on the echo data, avoiding the need for visual information assistance and tunnel width and height measurement.

Benefits of technology

It achieves efficient removal of multipath interference in tunnel tracks under any lighting conditions, reduces engineering costs, forms continuous target tracks, and improves real-time performance and separation efficiency.

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Abstract

This invention discloses a method for removing multipath interference in tunnel tracks based on zero-Doppler clutter points, primarily addressing the problem of multipath interference in tracks. The steps of this invention are as follows: Step 1, establish a millimeter-wave radar signal receiving model; Step 2, obtain the distance and velocity of the target within the tunnel; Step 3, use the maximum likelihood algorithm to obtain the angles of the target, left multipath, and right multipath, respectively; Step 4, generate the zero-channel clutter point vector at each moment; Step 5, obtain the angular position of the tunnel at each moment; Step 6, remove multipath interference from the track using the target region and the multipath region. This invention, by utilizing zero-Doppler channel clutter points, divides the signal region and multipath region solely based on echo data, conveniently and efficiently removing multipath interference from tunnel tracks.
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