Short-Time Velocity Identification and Coherent-Like Detection of Ultrahigh Speed Targets

Wang, Fei; Zhou, Jianjiang; Li, Ling; Crookes, Danny; Zhou, Huiyu

doi:10.1109/tsp.2018.2862407

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…In the future work, we will further discuss the control effect of the FCOC with filter. Moreover, we will consider the combination of parameter identification technology and fine modeling methods, such as other studies [29][30][31] , for complex fractional-order systems, to give more effective control scheme.…”

Section: Simulationmentioning

confidence: 99%

Tuning of fractional complex‐order direct current motor controller using frequency domain analysis

Zheng

Zhang

Huang

2020

Math Methods in App Sciences

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For the speed control of direct current motor, a fractional complex‐order controller (FCOC) is proposed in this paper. The FCOC is an extension of the fractional‐order controller. It is known that fractional‐order controllers exhibit strong robustness to open‐loop gain variations. However, in actual situations, due to external interference, the phase angle and gain of the system may change at the same time. The FCOC proposed in this paper adds an additional parameter, which makes the system show strong robustness when the phase angle and gain change simultaneously. Existing methods for parameter tuning of FCOCs only consider the preset gain crossover frequency and the expected phase margin. This may not allow the system to exhibit good dynamic and stable performance. In this paper, based on the frequency domain analysis, the parameters of the FCOC are tuned by integrating the gain crossover frequency, cutoff frequency, phase margin, and amplitude margin. The optimal solution satisfying a set of constraint equations is obtained by optimization algorithm. Finally, the simulation results are compared with those of the fractional‐order controller and the integer‐order controller. At the same time, the robustness of the system under disturbance is analyzed. The results show that the complex fractional‐order control presented in this paper has better dynamic performance and robustness.

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Section: Simulationmentioning

confidence: 99%

Tuning of fractional complex‐order direct current motor controller using frequency domain analysis

Zheng

Zhang

Huang

2020

Math Methods in App Sciences

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“…L represents the number of signals in additive noise. The KLD between the empirical spectral CDF (F † (x)) and the finite dimensional spectral CDF (F (x)) is used as an airborne radar RFS performance indicator [23,24]. Its calculation process is depicted in Figure 1.…”

Section: Application Of Kld In Echo Detectionmentioning

confidence: 99%

Extended Target Echo Detection Based on KLD and Wigner Matrices

Xie

Wang

2019

Sensors

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With the development of airborne radar radio frequency stealth (RFS) technology, the method of improving the RFS performance of airborne radar by optimizing target detection performance has been extensively studied. However, for wideband radar signals, the traditional point target model appears as an extended target model in the range-dimension, which is unfavorable to the detection of target echoes. To overcome the existing drawbacks, this paper devises an efficient echo detection algorithm from the perspective of information theory and random matrix. Firstly, aperiodic agile wideband radar signals are utilized to observe targets. Then, one frame of echo signals in the same range gate is reconstructed into a data form conforming to the Wigner matrix spectral decomposition. Finally, according to the signal detection theory, Kullback-Leibler Divergence (KLD) is used as the test statistic to complete the echo detection of the stealthy extended targets. By statistical analysis and comparison with other established echo detection algorithms, simulation results manifest that the proposed algorithm has superior detection performance and strong robustness, which not only makes up for the deficiency of traditional narrowband radar detection algorithms, but also increases the detection probability of radar system when it is faced with stealthy extended targets.

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“…It is not sufficient to support space charge measurements under transient stresses yet. Therefore, the improvement of spatial resolution and measurement speed, the two main metrics in space charge measurement, has become the further development goal in this area [12].…”

Section: Introductionmentioning

confidence: 99%

Development of a novel signal restoration algorithm to eliminate the distorted components in space charge measurement excited by femtosecond laser irradiation

Qi,

Ren,

Gao

et al. 2024

High Voltage

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For the space charge measurement method with optical excitation for electrical insulation, the distortion of the excitation laser on the measurement signal and the accumulation of space charge have not been discussed before. Both experiment and simulation results show that three types of distorted components introduced by optical excitation can lead to distortion of the upper interface signal. Further, the factors causing distortion of the measured signal and the formation mechanism are analysed. A virtual electrode potential compensation method and a distorted component extraction method are proposed. Meanwhile, an attenuation restoration and charge conversion correction factor is introduced, leading to a novel signal processing algorithm adapted to space charge optical measurement methods. Compared with the traditional algorithm, the novel algorithm has an error of less than 1% in the calculation of charge and electric field strength, with an increase in accuracy of 47.7% and 9.81%, respectively. By applying the novel restoration algorithm, the comparison shows that the space charge accumulation does not change significantly under laser irradiation, verifying the reliability of the optical excitation. The given algorithm can provide a theoretical and technical foundation for the realisation of the optical measurement method for space charge.

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Short-Time Velocity Identification and Coherent-Like Detection of Ultrahigh Speed Targets

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 8 publications

References 34 publications

Tuning of fractional complex‐order direct current motor controller using frequency domain analysis

Tuning of fractional complex‐order direct current motor controller using frequency domain analysis

Extended Target Echo Detection Based on KLD and Wigner Matrices

Development of a novel signal restoration algorithm to eliminate the distorted components in space charge measurement excited by femtosecond laser irradiation

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