Micro-Doppler Parameters Extraction of Precession Cone-Shaped Targets Based on Rotating Antenna

Wang, Zhihao; Luo, Ying; Li, Kaiming; Yuan, Hang; Zhang, Qun

doi:10.3390/rs14112549

Cited by 11 publications

(10 citation statements)

References 29 publications

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“…When there is a positive Doppler frequency shift, the number of impulses will be higher in the positive half of the modulation period. When moving away from the depolarization panel, the Doppler shift will cause negative frequency, so the number of impulses in the first half of the modulation period will be lower than the number of impulses in the negative half period of the modulation signal [ 26 , 27 , 28 ].…”

Section: Potential Use Of the Doppler Effect For Prediction Of The Al...mentioning

confidence: 99%

Evaluation of Doppler Effect Error Affecting the Radio Altimeter Altitude Measurements

Češkovič

Kurdel

Gecejová

et al. 2022

Sensors

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The measurement of the real altitude of aircraft is usually done using an aviation radio altimeter (ALT). A radio altimeter provides crucial information about the instantaneous (radio) altitude of aircraft, helicopter, or unmanned aerial vehicle, to the pilot or another assistance system, such as an autopilot or an anti-collision system. However, this flight altitude measurement is affected by several errors, methodological errors and the operating frequency and modulation parameters instability, or the Doppler shift error. This article is focused on the evaluation of how the Doppler effect error develops during the operation of an ALT and its potential use as an information carrier concerning a possible loss of radio altitude, leading to dangerous situations. This paper briefly explains in a theoretical and practical way how this error develops and how it can affect the process of creation of height impulses. Practical experiments were conducted and evaluated in this research, and a theoretical design of a simple circuit capable of signalization of radio altitude loss presented. As the Doppler shift error was previously recognized solely as a measurement error, it could be used in a new function as a source of supplemental warning information.

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Section: Potential Use Of the Doppler Effect For Prediction Of The Al...mentioning

confidence: 99%

Evaluation of Doppler Effect Error Affecting the Radio Altimeter Altitude Measurements

Češkovič

Kurdel

Gecejová

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…The difference in curve smoothness can be used to separate the micro-Doppler curves of the cone scattering points. The empirical mode decomposition method can be used to detect and estimate the precession frequency [ 14 ]. For cones with occlusion effects, Zhou et al [ 15 ] proposed a new algorithm of coherent single-range Doppler interferometry (CSRDI)-modified general parameterized time–frequency (GPTF) to extract micro-Doppler curves and estimate parameters.…”

Section: Introductionmentioning

confidence: 99%

Decoupling and Parameter Extraction Methods for Conical Micro-Motion Object Based on FMCW Lidar

Yang,

Liu

et al. 2024

Sensors

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Micro-Doppler time–frequency analysis has been regarded as an important parameter extraction method for conical micro-motion objects. However, the micro-Doppler effect caused by micro-motion can modulate the frequency of lidar echo, leading to coupling between structure and micro-motion parameters. Therefore, it is difficult to extract parameters for micro-motion cones. We propose a new method for parameter extraction by combining the range profile of a micro-motion cone and the micro-Doppler time–frequency spectrum. This method can effectively decouple and accurately extract the structure and the micro-motion parameters of cones. Compared with traditional time–frequency analysis methods, the accuracy of parameter extraction is higher, and the information is richer. Firstly, the range profile of the micro-motion cone was obtained by using an FMCW (Frequency Modulated Continuous Wave) lidar based on simulation. Secondly, quantitative analysis was conducted on the edge features of the range profile and the micro-Doppler time–frequency spectrum. Finally, the parameters of the micro-motion cone were extracted based on the proposed decoupling parameter extraction method. The results show that our method can effectively extract the cone height, the base radius, the precession angle, the spin frequency, and the gravity center height within the range of a lidar LOS (line of sight) angle from 20° to 65°. The average absolute percentage error can reach below 10%. The method proposed in this paper not only enriches the detection information regarding micro-motion cones, but also improves the accuracy of parameter extraction and establishes a foundation for classification and recognition. It provides a new technical approach for laser micro-Doppler detection in accurate recognition.

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“…The research of frequency characteristics based on EM scattering helps to provide theoretical support for radar detection and target identification [14,15], as well as SAR image processing [16,17]. Since the micro-Doppler features generated using different micro-motions are different, they also can be utilized to classify and recognize targets [18][19][20][21]. Chen has conducted a lot of excellent work on the micro-Doppler.…”

Section: Introductionmentioning

confidence: 99%

“…However, all the works [20][21][22][23][24] above were based on the point scattering model of a moving target. This method just considers the scattering echo of a few strong scattering points on the target, ignoring the influence of structural features on the scattering echo.…”

Section: Introductionmentioning

confidence: 99%

Fast Solution of Scattering and Micro-Doppler Features from Moving Target Using a Tailored Shooting and Bouncing Ray Method

Xi,

Li,

Guo

et al. 2023

Remote Sensing

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In this paper, we present a tailored shooting and bouncing ray (SBR) method for the fast solution of electromagnetic (EM) scattering from a moving target. And, the micro-Doppler features of the moving target are investigated using a time-frequency analysis technique. In our method, a dynamic spatial division technique is employed to accelerate facet information processing and ray-tracing progress of the moving target. At first, the two coordinate systems are established, which are the geodetic coordinate system (GCS) and the local coordinate system (LCS). In GCS, the target is moving with translation and rotation. The dynamic spatial division is established in LCS to store the facet information and remain relatively stationary to the target. In comparison with the traditional SBR method, this technique avoids repetitive spatial division at each moment in the GCS. Then, ray tracing is performed to find the illuminated facets in the LCS. Finally, the scattering field and the phase compensation are computed in the GCS. In numerical simulations, the verification and computation efficiency comparison are provided using our method and other solutions (MLFMM, RL-GO, and traditional SBR). Moreover, the micro-Doppler features are extracted and analyzed using the time-frequency analysis technique, which includes the precession and spin of the missile, and the rotation of the aircraft. Meanwhile, the micro-Doppler spectra of the target is also compared with the theoretical Doppler of equivalent strong scattering points, which are obtained using the instantaneous high-resolution range profile (HRRP).

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Micro-Doppler Parameters Extraction of Precession Cone-Shaped Targets Based on Rotating Antenna

Cited by 11 publications

References 29 publications

Evaluation of Doppler Effect Error Affecting the Radio Altimeter Altitude Measurements

Evaluation of Doppler Effect Error Affecting the Radio Altimeter Altitude Measurements

Decoupling and Parameter Extraction Methods for Conical Micro-Motion Object Based on FMCW Lidar

Fast Solution of Scattering and Micro-Doppler Features from Moving Target Using a Tailored Shooting and Bouncing Ray Method

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