A long-distance high-speed target tracking method based on low repetition frequency OFDM radar

By combining low-repetition-rate OFDM radar with sparse signal processing, the problems of Doppler frequency shift and insufficient range resolution for long-distance, high-speed moving targets were solved, achieving high-resolution target tracking.

CN117491986BActive Publication Date: 2026-05-29CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA INFOMRAITON CONSULTING & DESIGNING INST CO LTD
Filing Date
2023-10-11
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing OFDM radar technology is not suitable for parameter estimation of long-range, high-speed moving targets by low-repetition-rate radar, especially due to its sensitivity to Doppler frequency shift and insufficient range resolution.

Method used

By employing a low repetition rate transmission mode, combining orthogonal frequency division multiplexing (OFDM) signals and sparse signal processing, and compensating for Doppler frequency shift through intra-pulse sparse reconstruction and correcting range offset through inter-pulse sparse reconstruction, high-resolution target tracking is achieved.

Benefits of technology

In scenarios involving long-distance, high-speed moving targets, the range-Doppler parameter estimation capability of the target is significantly improved, enabling high-resolution target tracking.

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Abstract

The application provides a long-distance high-speed target tracking method based on low-repetition-frequency OFDM radar, which comprises the following steps: step 1, in a vehicle-mounted radar, a low-repetition-frequency transmission mode is used, and an in-pulse modulation waveform adopts an orthogonal frequency division multiplexing (OFDM) signal; step 2, a carrier frequency of each transmission pulse is modulated, and the carrier frequency of each pulse randomly jumps in a preset synthetic bandwidth; step 3, a return signal of the vehicle-mounted radar is received, the return signal of each pulse is down-converted according to the transmission carrier frequency, and a pulse signal is digitally sampled at a baseband; step 4, data obtained after the digital sampling is used to calculate motion parameters of the target; and step 5, the motion parameters obtained in step 4 are used to track and locate a long-distance high-speed target.
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