TY - GEN
T1 - An Efficient Coherent Integration Method for Non-Uniform Pulse Repetition Interval Radar
AU - Gao, Ge
AU - Tao, Shan
AU - Bai, Xia
AU - Feng, Yuan
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - Long-time coherent integration is an effective method to enhance the signal-to-noise ratio (SNR) of radar echoes. However, non-uniform Pulse Repetition Interval (PRI) radar faces the challenge of Doppler spectrum distortion besides the range migration during long-time coherent integration. This paper proposes a new algorithm to correct non-uniform spectrum and range migration in a single processing step. The proposed method, implemented using a DFT-based approach, achieves a good balance between compensation performance and computational load compared with existing methods, such as correcting spectral distortion using NUDFT followed by range migration correction using KT, or implementing non-uniform KT via sinc interpolation principle. The simulation results demonstrate that the proposed method achieves an improvement in integration gain of 4.9 dB and 2.2 dB compared to the above two methods when the target velocity is near the boundary. The real-measured data analysis further indicate that the proposed method reduces the runtime by 37% compared to the NUDFT method under the condition of comparable integration gain. And the proposed method achieves an improvement in integration gain of 1.7 dB compared to the sinc interpolation method under the condition of comparable runtime. The results validate the effectiveness of the proposed method.
AB - Long-time coherent integration is an effective method to enhance the signal-to-noise ratio (SNR) of radar echoes. However, non-uniform Pulse Repetition Interval (PRI) radar faces the challenge of Doppler spectrum distortion besides the range migration during long-time coherent integration. This paper proposes a new algorithm to correct non-uniform spectrum and range migration in a single processing step. The proposed method, implemented using a DFT-based approach, achieves a good balance between compensation performance and computational load compared with existing methods, such as correcting spectral distortion using NUDFT followed by range migration correction using KT, or implementing non-uniform KT via sinc interpolation principle. The simulation results demonstrate that the proposed method achieves an improvement in integration gain of 4.9 dB and 2.2 dB compared to the above two methods when the target velocity is near the boundary. The real-measured data analysis further indicate that the proposed method reduces the runtime by 37% compared to the NUDFT method under the condition of comparable integration gain. And the proposed method achieves an improvement in integration gain of 1.7 dB compared to the sinc interpolation method under the condition of comparable runtime. The results validate the effectiveness of the proposed method.
KW - DFT-based realization method
KW - non-uniform keystone transform
KW - non-uniform signal sampling
UR - http://www.scopus.com/pages/publications/105010822709
U2 - 10.1109/ISEAE64934.2025.11042000
DO - 10.1109/ISEAE64934.2025.11042000
M3 - Conference contribution
AN - SCOPUS:105010822709
T3 - 2025 7th International Conference on Information Science, Electrical and Automation Engineering, ISEAE 2025
SP - 901
EP - 906
BT - 2025 7th International Conference on Information Science, Electrical and Automation Engineering, ISEAE 2025
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th International Conference on Information Science, Electrical and Automation Engineering, ISEAE 2025
Y2 - 18 April 2025 through 20 April 2025
ER -