A method for MIMO stepped frequency radar channel self-calibration

By controlling the system through signal processing and control modules, and employing conjugate multiplication, matched filtering, and peak alignment operations of step frequency signals and echo signals, the complexity and stability issues of multi-channel calibration in MIMO radar are solved, achieving the effects of simplified design and cost reduction.

CN117930158BActive Publication Date: 2026-06-23CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2024-01-29
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing MIMO radar life detectors and through-wall radars, the calibration between multi-channel RF transceiver hardware requires the addition of a separate hardware calibration channel, which leads to complex system design, high cost and poor stability, and cannot completely eliminate amplitude and phase inconsistency differences.

Method used

The system is controlled by a signal processing and control module. It employs conjugate multiplication, matched filtering, and peak alignment operations of the step frequency signal and echo signal to achieve self-calibration of the MIMO radar channel, simplifying system design and reducing costs.

Benefits of technology

Real-time self-calibration of the MIMO radar channel was achieved, which improved the system's stability and operating speed, simplified system design, and reduced costs.

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Abstract

The application discloses a kind of MIMO step frequency radar channel self-calibration methods, including control MIMO radar system switches to calibration state, while transmitting calibration signal;Based on the system under calibration state, through the N-way receiver of radar, receive N-way calibration signal;Control MIMO radar system switches to transmission state, while transmitting M-way step frequency signal;Set ideal point target, receive the echo signal of target;Using received N-way calibration signal and the echo signal of target, through conjugate multiplication processing, obtain frequency point calibrated signal;Using frequency point calibrated signal, through matching filter processing, obtain the different delay of target signal and calibration signal;Using the signal after matching filter processing, through peak value search, alignment operation processing, calibrate the time delay of different transceiver channel, complete the step frequency MIMO radar channel self-calibration of system;The system design of the method of the application is simplified, cost is reduced, stability is improved.
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