An online self-calibration and drift compensation method for a vehicle-mounted small radar

By constructing an FMCW chirped loop calibration channel and an adaptive segmented compensation method at the radar front end, the ranging accuracy and range resolution problems of vehicle-mounted small radar under nonlinear drift are solved, and high-precision online self-calibration and drift compensation are achieved.

CN122110028BActive Publication Date: 2026-07-21SHANGHAI LAINGAN PHOTOELECTRIC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI LAINGAN PHOTOELECTRIC TECH CO LTD
Filing Date
2026-04-30
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing vehicle-mounted small radars with FMCW technology experience nonlinear drift in transmitted chirped signals due to factors such as temperature fluctuations, mechanical vibrations, and power supply voltage fluctuations during actual operation. Existing compensation methods cannot effectively cope with complex nonlinear changes, affecting ranging accuracy and range resolution.

Method used

An FMCW chirped loop calibration channel is constructed inside the radar front-end packaging module. A closed-loop path is formed through a directional coupler and a known dielectric delay line. The instantaneous frequency deviation is extracted using Hilbert transform, and compensation is performed using adaptive segmented interval division and Volterra inverse model to achieve high-precision calibration under all operating conditions.

Benefits of technology

It achieves continuous availability of calibration data under any operating conditions, improves the accuracy and real-time performance of nonlinear compensation, avoids the risk of calibration failure due to external target dependence, and ensures the stability of ranging accuracy and distance resolution.

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Abstract

The present application relates to the technical field of automatic control, and further relates to a kind of online self-calibration and drift compensation method of vehicle-mounted small radar, method includes the following steps: step 1: in the front-end package module of vehicle-mounted small radar, output loopback beat signal and obtain the digital sample sequence of loopback beat signal by analog-digital conversion;Step 2, the digital sample sequence of loopback beat signal is executed Hilbert transform to obtain analytic signal sequence, and adaptive segmented interval division is executed to instantaneous frequency deviation sequence and the drift feature vector of each segmented interval is extracted;Step 3, the signal link between the input from the transmitting digital baseband signal to the instantaneous frequency deviation output is defined as closed-loop equivalent nonlinear system, and after point-by-point addition with transmitting digital baseband signal, it is output to transmitting channel by digital-analog converter.The present application considers the compensation accuracy and the real-time constraint of vehicle-mounted embedded platform.
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