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Keywords = Doppler-induced error compensation

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16 pages, 1505 KiB  
Article
KT-SRAF-LVD-Based Signal Coherent Integration Method for High-Speed Target Detecting in Airborne Radar
by Wenwen Xu, Yuhang Wang, Jianyin Cao and Hao Wang
Sensors 2025, 25(7), 2128; https://doi.org/10.3390/s25072128 - 27 Mar 2025
Viewed by 371
Abstract
In the application of an airborne radar platform, the rapid relative motion between target and airborne radar induces range migration (RM) and Doppler frequency migration (DFM). The motion errors caused by airflow, air friction, and navigation inaccuracies will exacerbate the RM and DFM [...] Read more.
In the application of an airborne radar platform, the rapid relative motion between target and airborne radar induces range migration (RM) and Doppler frequency migration (DFM). The motion errors caused by airflow, air friction, and navigation inaccuracies will exacerbate the RM and DFM problems and render traditional coherent integration methods ineffective. Previously reported airborne coherent integration methods are hindered by high computational complexity, limiting their practical application. Therefore, developing motion error compensation and coherent integration methods with reduced computational complexity and a high detection performance is of critical importance. To address these challenges, a novel method based on the keystone transform, sequence-reversing autocorrelation function, and Lv’s distribution (KT-SRAF-LVD) is proposed. Simulation results demonstrate that the proposed method achieves a good balance between computational complexity and detection performance, indicating great potential for practical engineering applications. Full article
(This article belongs to the Section Radar Sensors)
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12 pages, 8405 KiB  
Article
Dynamic Distance Measurement Based on a Fast Frequency-Swept Interferometry
by Yuru Chen, Xiaohua Lei, Lin Xiao, Peng Zhang and Xianming Liu
Sensors 2022, 22(13), 4771; https://doi.org/10.3390/s22134771 - 24 Jun 2022
Cited by 2 | Viewed by 1988
Abstract
To improve the precision of dynamic distance measurement based on the frequency-swept interferometry (FSI) system, a Doppler-induced error compensation model based on a scheme increasing the frequency sweeping rate is proposed. A distance demodulation method based on a Fourier transformation is investigated when [...] Read more.
To improve the precision of dynamic distance measurement based on the frequency-swept interferometry (FSI) system, a Doppler-induced error compensation model based on a scheme increasing the frequency sweeping rate is proposed. A distance demodulation method based on a Fourier transformation is investigated when the defined quasi-stationary coefficient approaches a constant. Simulations and experiments based on dynamic distance with a sinusoidal change demonstrate that the proposed method has a standard deviation of 0.09 μm within a distance range of 4 μm at a sweeping rate of 60 KHz. Full article
(This article belongs to the Section Optical Sensors)
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12 pages, 2399 KiB  
Article
Bistatic-ISAR Linear Geometry Distortion Alleviation of Space Targets
by Lin Shi, Baofeng Guo, Ning Han, Juntao Ma, Xiaoxiu Zhu and Chaoxuan Shang
Electronics 2019, 8(5), 560; https://doi.org/10.3390/electronics8050560 - 20 May 2019
Cited by 5 | Viewed by 3060
Abstract
The linear geometry distortion caused by time variant bistatic angles induces the sheared shape of the bistatic inverse synthetic aperture radar (bistatic-ISAR) image. A linear geometry distortion alleviation algorithm for space targets in bistatic-ISAR systems is presented by exploiting prior information. First, we [...] Read more.
The linear geometry distortion caused by time variant bistatic angles induces the sheared shape of the bistatic inverse synthetic aperture radar (bistatic-ISAR) image. A linear geometry distortion alleviation algorithm for space targets in bistatic-ISAR systems is presented by exploiting prior information. First, we analyze formation mathematics of linear geometry distortions in the Range Doppler (RD) domain. Second, we estimate coefficients of first-order polynomial of bistatic angles by least square error (LSE) method through exploiting the imaging geometry and orbital information of space targets. Third, we compensate the linear spatial-variant terms to restore the linear geometry distortions. Consequently, the restored bistatic-ISAR image with real shape is obtained. Simulated results of the ideal point scatterers dataset and electromagnetic numerical dataset verify the performance of the proposed algorithm. Full article
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