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Review of Weak Signals Detection Methods 16

Review of Weak Signals Detection Methods

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Huang, Min Zhou, Anhang Wang, Li Wang, Yifan Qiu, Gen School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

In engineering application, the weak signals generated by the system during operation are useful in determining the working status of the system. But such effective signals are usually masked by strong noise, making it difficult to extract useful information. Therefore, it is particularly important to study weak signal detection technology. This article introduces some weak signal detection methods including linear method and nonlinear method. Linear detection methods can be generally divided into time domain analysis, frequency domain analysis and Time-Frequency analysis. Nonlinear method includes Chaos theory, Stochastic resonance method, differential oscillator and adaptive decomposition, which are the main nonlinear detection methods for weak signals. Then, this article analyzes the application scope, advantages, and disadvantages of these weak signal detection methods and summarized for future prospects. © 2023 IEEE.

关键词： Time domain analysis

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Influence of water film on subsurface defect detection using eddy current pulsed thermography 3

Influence of water film on subsurface defect detection using...

引用

3rd International Congress on Optics, Electronics, and Optoelectronics, ICOEO 2022

作者： Miao, L. Gao, B. Li, H.R. Liu, L. Yang, G. School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

Eddy current pulsed thermography (ECPT) is an effective non-destructive testing (NDT) technique for detecting flaws in metallic materials. However, due to the low radiation and high reflection properties of metallic materials, as well as the inhomogeneous emission caused by the complex states of the material surface, the detection of subsurface defects becomes difficult. In this paper, the physical mechanisms underlying the interference of the thin water film in ECPT detection are studied. Two static comparative experiments have been carried out on the ferromagnetic plate with several artificial subsurface defects. In the first comparative experiment, a high radiation point has been artificially added near the defects. The experimental results showed that water film could eliminate the influence of inhomogeneous emission. In the second experiments, the effectiveness of water film in improving the detectability of subsurface defects has been demonstrated and the subsurface defects with a maximum buried depth of 0.4 mm can be detected. © Published under licence by IOP Publishing Ltd.

关键词： Eddy current testing

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Pulse-Width Trigger Method in 10GSPS Data Acquisition System 16

Pulse-Width Trigger Method in 10GSPS Data Acquisition System

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Li, Chengyang Tian, Shulin Ye, Peng Chen, Aijun Huang, Chuan Lei, Maolin Chen, Li Yang, Kuojun School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

In linear FM signal detection applications such as communications and radar, the pulse width of the signal can vary by hundreds of picoseconds, requiring the acquisition system to have higher acquisition performance and trigger performance to acquire and capture signals with small variations in pulse width. As one of the advanced trigger functions of a data acquisition system, pulse-width trigger has the ability to detect the pulse width of the input signal in real time and control the acquisition process in order to capture the signal that meets the conditions of pulse-width trigger. With the increasing frequency of the signal, the high-speed acquisition system is required not only to have the ability to capture small changes in the signal pulse width, but also to have a higher ability to detect the minimum pulse width. In high-speed acquisition systems, the traditional pulse-width trigger is realized by the analog pulse-width trigger. The analog pulse-width trigger has the advantage of real-time, but it also has the problem of large trigger jitter and low trigger accuracy due to the non-linear lead of the high-speed analog device and the analog-digital synchronization. This paper proposes a high-precision digital pulse-width trigger method. The method adopts the design of synchronizing the sampling data with the trigger data source, which solves the problem of trigger jitter in analog pulse-width trigger. The digital pulse-width trigger uses a method of converting high-speed parallel sampling data into parallel feature data that can characterize the edge features of the pulse signal. Then, according to the characteristics of the starting edge and the ending edge of the pulse width, the pulse width of the pulse signal is calculated. Finally, the pulse width trigger judgment is performed, and the trigger point position is obtained in real time to achieve the high-precision pulse width trigger. The method is implemented in a 10GSPS data acquisition system using an AD

关键词： Signal detection

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Unknown Input Interval Observer Based Attack Tolerant State Estimation for Fuzzy CPSs 49

Unknown Input Interval Observer Based Attack Tolerant State ...

引用

49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Liu, Qidong Long, Yue Li, Tie-Shan Yang, Hanqing School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350331820

This paper investigates the problem of attack tolerant state estimation for nonlinear Cyber-Physical Systems (CPSs). Firstly, a fuzzy system is employed to model the nonlinear CPS, and the system dynamics are re-described according to the working region, taking into account the effects of network attacks and multi-source disturbances. Inspired by previous interval observers and unknown input observers, an unknown input interval observer is proposed in this paper. The observer can isolate decoupled disturbances and the resulting interval error augment system is stable and robust to the bounded attack, with the caveat that the system matrix of the interval error augmentation system must also be non-negative. After some mathematical manipulation, these performances can be guaranteed by a set of linear matrix inequality (LMI) based solvable conditions. Finally, the effectiveness of the proposed method is verified through a set of experiments. © 2023 IEEE.

关键词： State estimation

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Design and Implementation of Time-Synchronizing System Based on White Rabbit 16

Design and Implementation of Time-Synchronizing System Based...

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Zan, Liyu Hou, Dong Fang, Lujun Zou, Lingwen Gao, Shuaihao School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

With the continuous development of national telecommunication technology, there is an urgent requirement to deploy high quality time-synchronizing systems in different distribution scenarios, such as 5G Communication, Smart Grid, and Astronomical Monitoring, in order to satisfy various requirements, such as improving wireless space spectrum utilization and PMU steady-state accuracy. Currently, the emerging WR technology can achieve sub-nanosecond synchronization errors. However, it still has some drawbacks, such as the large time fluctuation required for synchronization and the difficulty in fine-tuning the link delayed compensation. Thus, the paper designs and implements a high precision time- synchronizing system with FPGA as the main control chip, which can guarantee synchronization errors better than 1 ns and accuracy better than 100 ps in the 10 km fiber transmission distance, control the time required for synchronization within the 20 s by algorithm improvement, and make the time delay compensation resolution up to 20 ps. © 2023 IEEE.

关键词： Synchronization

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Multi-Level Pattern Synthesis Based on FPGA and DAC 16

Multi-Level Pattern Synthesis Based on FPGA and DAC

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Luo, Qi Fu, Zaiming Chen, Li Liu, Hanglin Kong, Dexuan Dang, Haoyang School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

This paper presents a design for a multi-level pattern generator based on Field Programmable Gate Array (FPGA) and Digital to Analog Converter (DAC). The proposed generator utilizes dynamic time error control to synthesize multi-level and pseudo-random bit sequence (PRBS) coding patterns, thereby expanding the application range of the pattern generator. To overcome the limited speed of FPGA logic resources and achieve a sample rate of 1.25 giga samples per second (GSPS) for the DAC, the design incorporates eight parallel channels of a processing unit. Experimental results demonstrate that the pattern generator can synthesize pattern signals at rates up to 120 mega samples per second (MBd) with voltage magnitudes of 2-level, 3-level, and 4-level. © 2023 IEEE.

关键词： Digital to analog conversion

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High-Precision Time Transfer based on Power Line Communication

High-Precision Time Transfer based on Power Line Communicati...

引用

2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Zhang, Peng Li, Ze Guo, Guangkun Liu, Ke Hou, Dong University of Electronic Science and Technology of China School of Automation Engineering Chengdu China

ISBN: (纸本)9798350311426

Time transfer is widely used in several fields. Conventional time transfer links such as optical fiber and radio cannot work stably during military readiness or war conditions. Power line communication (PLC) is safer. However, its channel characteristics are poor and there are large burst errors and random errors during transmission. In order to solve this problem, this paper designs a system that can perform time transmission over power lines. In this system, Inter Range Instrumentation Group (IRIG-B) code, Reed-Solomon (RS) code and convolutional code complete the time code encoding. Orthogonal Frequency Division Multiplexing (OFDM) completes the physical layer transmission. The time transfer experiments show that the system has a transmission success rate higher than 99%, and the root meam square (rms) fluctuation is 109 ns. © 2023 IEEE.

关键词： IRIG-B code Power line communication Time transfer

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A Magnitude-Response Compensation Method in the FI-DAC-Based Arbitrary Waveform Generator 16

A Magnitude-Response Compensation Method in the FI-DAC-Based...

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Zhao, Wenhao Tian, Shulin Liu, Ke Shen, Yang Guo, Guangkun Wu, Qiong School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

An arbitrary waveform generator (A WG) is a general-purpose testing device that can easily generate excitation signals according to user needs. With the continuous evolution of electronic science and technology, increasing demands for a higher AWG sampling rate and output bandwidth has been put forward. A frequency-interleaved digital-to-analog converter (FI-DAC) can improve those parameters quite effectively. However, due to the magnitude roll-off characteristic of the DAC and the magnitude attenuation of analog devices, such as filters, mixers, and combiners, in the FI-DAC structure, the output signal exhibits serious magnitude distortion. Hence, in this paper we establish an error model for an FI-DAC and propose a minimax method to design the magnitude-response compensation filter. Finally, the performance of the designed compensation filter was validated using a purpose-built experimental test bench. © 2023 IEEE.

关键词： Digital to analog conversion

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Frequency Domain Detection Method Based on WOLA Structure with Matched Filtering 16

Frequency Domain Detection Method Based on WOLA Structure wi...

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Lei, Maolin Ye, Peng Yang, Kuojun Li, Chengyang Dai, Xuefeng Chen, Li Ming, Ruiyuan School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

At high sampling rates, the data throughput is large, and part of the data will be discarded because the data cannot be processed in real time, which leads to an increase in the probability of missing transitory signals. On the other hand, in practical test scenarios, the measured signal often has the characteristics of frequency domain sparseness, and the signal of interest is often located in a specific frequency band. Therefore, in this paper, a matching filtering frequency domain detection method based on the WOLA structure is proposed. The high-efficiency WOLA structure is used to decompose the signal according to different frequency bands. The output signal of each sub-frequency band is matched and filtered to extract the signal of interest from the noise. And the best judgment basis is provided at the detection time. According to the determined frequency domain position information, the system can filter out the signal of interest and prevent the risk of missing occasional signals, and solve the problem of high data throughput faced by transient signal processing in the time domain at high sampling rates. In the experiment, the pulse frequency hopping signal is used to verify the effectiveness, and the results show the effectiveness of the proposed detection method. © 2023 IEEE.

关键词： Signal detection

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Design of Multifunctional Built-in Test System for Communication Equipment 16

Design of Multifunctional Built-in Test System for Communica...

引用

16th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2023

作者： Luo, Guangkun Wei, Yangbin Cao, Jiawei Li, Hao Wang, Zhigang Li, Xuyang School of Automation Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9798350327144

Aiming at the needs of fast, timely and low complexity field test and maintenance of modern communication equipment, this paper designs a multifunctional communication equipment built-in test (BIT) system, and gives a detailed software and hardware design scheme. The system can quickly test and diagnose the RF, IF and LF modules in the communication equipment. The verification results show that the functional modules of the system can stably obtain the status data, and display the test data and diagnosis results in multiple styles, which meets the system design requirements. The system architecture can also provide reference for the research, design and implementation of built-in test technology for other equipment. © 2023 IEEE.

关键词： Software testing

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