Huijie Liu

University of Chinese Academy of Sciences

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Rujiang Guo

University of Chinese Academy of Sciences

Xuwen Liang

Shanghai Micro Satellite Engineering Center

Guang Liang

Hangzhou Medical College

Haihua Xie

University of Chinese Academy of Sciences

Zijian Yang

Shanghai Micro Satellite Engineering Center

Lulu Zhao

Chinese Academy of Sciences

Jinpei Yu

Shanghai Micro Satellite Engineering Center

Han Ren

Shanghai Micro Satellite Engineering Center

Wenbin Gong

Xuzhou University of Technology

Xingfu Liu

Shandong First Medical University

Cooperative Institutions

Shanghai Micro Satellite Engineering Center

Innovation Academy for Microsatellites of Chinese Academy of Sciences

University of Chinese Academy of Sciences

Chinese Academy of Sciences

Shanghai Institute of Microsystem and Information Technology

ShanghaiTech University

Shanghai University

Harbin Institute of Technology

Nanjing University

University of Science and Technology of China

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High-speed electron flows in the terrestrial magnetotail

Huijie Liu Wenya Li Binbin Tang Chi Wang

High-speed electron flows play a crucial role in the energy dissipation and conversion processes within the terrestrial magnetosphere, particularly in regions associated with magnetic reconnection, such as the vicinity of electron diffusion regions (EDRs) and separatrix layers. NASA's Magnetospheric Multiscale (MMS) mission was specifically designed to reveal electron-scale kinetic processes occurring in Earth's magnetosphere. In this study, we conduct a comprehensive survey of high-speed electron flows in the terrestrial magnetotail, utilizing MMS observations spanning from 2017 to 2021. Our analysis identifies a total of 642 events characterized by electron bulk speeds exceeding 5,000 km/s. Notably, these events exhibit a clear dawn-dusk asymmetry, with 73% of them occurring in the dusk magnetotail. Along the magnetotail's normal direction, we find that 37.7%, 21.8%, and 40.5% of the events are located in the plasma sheet, plasma sheet boundary layer, and lobe region, respectively. The occurrence rate of these events peaks when the magnetic field strength is approximately 19 nT. High-speed electrons predominantly move along magnetic field lines in the plasma sheet boundary layer and lobe region, while in the plasma sheet, they traverse along arbitrary directions with respect to the magnetic field. Our study contributes to a deeper understanding of the complex electron dynamics under various plasma and magnetic field conditions within Earth's magnetotail.

10.5194/egusphere-egu24-7364

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Multi-granularity grey incidence measurement method to data distribution sequence

Jin Dai Mei Wang Huijie Liu Yannan Sun

The data distribution sequence is an important tool in data compression and data storage area. The traditional grey incidence measurement method is mainly focus on the accurate numerical sequences, and lacks of the effective analysis and data mining tools to the mixed type sequence (such as sequence contains grey numbers, fuzzy numbers, random numbers, etc.) Based on the specified partition in sequence, with the universality of normal distribution, a normal data distribution sequence (NDDS), which reflects the feature of the data distribution of sequence, is proposed. Meanwhile, a novel grey incidence measurement method, which is based on normal cloud model similarity and generalized degree of grey incidence, is adopted to calculate the incidence degree between the distribution sequences. It is effective solutions to the grey incidence analysis for the multi-granularity data sequences. Finally, experiments fully prove the effectiveness of the method, which provides a new idea to improve the further development of grey theory.

Granularity

Sequence (biology)

10.1109/icccbda.2017.7951889

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A Fast Direct Position Determination Algorithm for LFM Signal Based on Spectrum Detection

Journal of Sensors (2022)

Han Ren Huijie Liu Rujiang Guo

For the purpose of simultaneously estimating and locating the linear frequency modulation (LFM) emitter with unknown parameters, an innovative approach, i.e., Fast Direct Position Determination (FDPD), is introduced. The proposed algorithm is based on maximum likelihood estimation (MLE) and spectrum detection. To improve the accuracy and overcome the dramatic complexity of plain maximum likelihood formulation, we further derive the objective function equation of Direct Position Determination (DPD) algorithm and present an enhanced strategy to solve the highly nonlinear optimization problem. By combining the two-step localization method, one-step localization method, and short-time Fourier transform (STFT), our approach realizes jointly estimation of the transmitted signal parameters and emitter localization. Simulation results show that the proposed method is superior compared to the existing DPD, and two-step localization algorithms in terms of localization error and computational complexity, especially for low signal-to-noise ratio (SNR).

Position (finance)

SIGNAL (programming language)

Modulation (music)

10.1155/2022/2222247

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Synchronization and Modulation of Chaotic Communication with Optical Feedback

Communications technology (2009)

Huijie Liu

The open-loop chaotic communication system is composed of F-P semiconductor lasers of external-cavity feedback.The type and performance of synchronization in the system is analyzed.It confirms that the system achieves to complete synchronization for weak injection,and isochronous synchronization for strong injection.For strong injection,the synchronization by corrected system gain could reflect more exactly the performance of synchronization.The information is encrypted in chaos carrier by chaotic modulation method.The result indicates that the recovered information is better by using corrected subtraction demodulation method and at the condition of large injection coefficient.

Modulation (music)

Subtraction

Secure Communication

Source

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A SEMI-PHYSICAL SIMULATION SYSTEM FOR DBF TRANSMITTER ARRAY ON LEO SATELLITE

Electromagnetic waves (2009)

Guang Liang Wenbin Gong Huijie Liu Jinpei Yu

This paper presents a semi-physical simulation system for 61-channel DBF array transmitter antenna on LEO satellite.It consists of a hardware platform for digital beamfoming network (BFN) and a software simulation system for DBF array.The background and wideband input interface are described, and the signal process of digital beamforming network is discussed in detail.General DFT filter bank, distributed arithmetic (DA) algorithm and Hartley image rejection structure are adopted to design the digital BFN, which make the calculation of BFN reduced by 98.41% and get the multiplier consumption decreased to 7.11%, compared with conventional algorithms.A novel digital BFN hardware platform with distributed structure is designed, which can complete the high speed array signal processing with maximum throughput of 32.025 Gbps.Ultimately, the measurements of semi-physical simulation system show good agreement with the ideal simulation result.The derivation of radiation pattern from energy distribution of earth's surface demonstrates that the DBF array has good performance on beam coverage with equal flux density and satisfies the application in mobile satellite communication.

10.2528/pier09081904

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Dual-channel chaos laser communication system based on fiber link with dispersion compensation scheme

Huijie Liu Bin Ren Jiuchao Feng

A model of dual-channel chaos laser communication system based on fiber transmission is proposed in this paper. The practical open-loop configuration at strong injection condition and the excellent symmetrical dispersion compensation scheme are applied in this model. The chaotic modulation (CM) and chaotic shift keying (CSK) methods are used to encrypt the message. The communication performances of both channels are evaluated by the decoding Q factor. And, further, the influences of injection power, encryption method and bit-rate of message on the performances of both channels are researched. The simulation result indicated that the optimal injection power will decrease when two channels are multiplexed compared with the single-channel case in order to balance between restraining the adjacent interfere and keeping optical field enough strong. For each channel, CSK method is better for a low bit-rate message and CM method is better for a high bit-rate. However, for the case of dual-channel communication, one channel can achieve the optimal performance at best whatever the encryption method are. It requires that different encryption methods are applied in both channels, and the optimal communication performance can be achieved for the low-speed channel encrypted by CSK method and the high-speed channel encrypted by CM.

Optical chaos

10.1109/wocc.2013.6676450

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CycHash: A Novel Deep Learning to Hash Method for Image Retrieval

2021 7th Annual International Conference on Network and Information Systems for Computers (ICNISC) (2021)

Zhuangping Qi Lei Liu Huijie Liu Li Li Hua Gao

We propose a deep learning to hash method named CycHash to improve image retrieval. Its network is an encoder-decoder architecture. Cooperated with full-connected layers, an encoder is used to transform image to hash code. The decoder network is used to restore high-dimensional data from encoded feature maps. We define a restoration loss between the restored data from decoder network and inputted data of decoder network. The restoration loss and central similarity loss are summarized to guide the learning of hash function. Experiments of image retrieval demonstrate the effectiveness of our CycHash method and CycHash outperforms state-of-the-arts.

Feature (linguistics)

Code (set theory)

Similarity (geometry)

10.1109/icnisc54316.2021.00173

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A novel compact his-EBG structure and its application in reduction of printed antenna mutual coupling

Journal of Electronics (China) (2011)

Lv Yuan Xingwei Zhao Huijie Liu Xuemin Shen

Decoupling (probability)

10.1007/s11767-011-0589-6

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LEO Satellite Scheduler Model and Simulation

Zeng Yuan Wenbin Gong Huijie Liu Xuwen Liang

In this paper, we propose inline DRR (deficit round robin) scheduling algorithm due to the limitation of the satellite switch processing speed and memory capacity. We build the model in OPNET. The results show that inline DRR processing delay is 26ms lower than DRR. The inline DRR complexity is O(1). According to the traffic and network structure of low earth orbit satellite system, we adopt CICQ as satellite on board switch structure and apply inline DRR in switch. At the same time, we build the model of the satellite on board switch in OPNET. The simulated results demonstrate that inline DRR algorithm switch delay is lower than 6ms and the algorithm is applicable for satellite switch.

Satellite constellation

10.1109/wicom.2008.1032

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Citations (1)

Constrained nondominated neighbor immune multiobjective optimization algorithm for multimedia delivery

Multimedia Tools and Applications (2016)

Xinglong Jiang Yu Yang Lulu Zhao Huijie Liu

Optimization algorithm

10.1007/s11042-016-3957-2

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Citations (5)