Journals >Electronics Optics & Control
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2021
Volume: 28 Issue 8
24 Article(s)
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Multi-model Adaptive Control of Nonlinear Systems Based on Improved BP Neural Network
WANG Suzhen, and LIU Jianfeng
As for a class of nonlinear discrete systems with unknown parametersa multi-model control method based on the improved BP neural network is proposed.Firstlythe nonlinear system is expressed with a linear part and a nonlinear part.When the nonlinear part has small impact on the systemthe linear robust controller desiAs for a class of nonlinear discrete systems with unknown parametersa multi-model control method based on the improved BP neural network is proposed.Firstlythe nonlinear system is expressed with a linear part and a nonlinear part.When the nonlinear part has small impact on the systemthe linear robust controller designed based on the fixed model and the adaptive model is directly used to control the system.When the nonlinear part has large impact on the systemthe adaptive control under the improved BP neural network is adopted.Secondlythe switching criterion is used to smoothly switch the control input and the stability of the system is proved.Finallysimulation results show that the proposed method can improve the system control quality and reduce the oscillation of the control signal..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 1 (2021)
Fault-Tolerant Control of Quadrotor UAV Based on Integral Sliding Mode Method and Extended State Observer
LIU Gaoyang, GUO Yuying, and JIAO Hailin
Based on integral sliding mode method and Extended State Observer (ESO)an active fault-tolerant control system is developed to implement position and attitude control of quadrotor UAV with actuator failure.A nonlinear model of UAV with actuator failure is establishedand a Sliding Mode Control (SMC) method with strongBased on integral sliding mode method and Extended State Observer (ESO)an active fault-tolerant control system is developed to implement position and attitude control of quadrotor UAV with actuator failure.A nonlinear model of UAV with actuator failure is establishedand a Sliding Mode Control (SMC) method with strong disturbance rejection ability is used to design basic controllers for the inner loop of attitude and the outer loop of position.In order to reduce the errors of the steady-state systeman integral sliding mode controller is constructed.The boundary layer method is used to suppress the chattering of SMC algorithmwhile ESO is used to estimate the total internal and external disturbances and the interference of actuator failure in real time and then compensate for the controlled variables.It is verified by Lyapunov stability theory that the flight control system can converge rapidly to a stable stateand the effectiveness and robustness of the developed flight control system are verified by some numerical simulations..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 6 (2021)
Finite-Time Tracking Control of Pure-Feedback Systems with Input Saturation
HE Cheng, WU Jian, and ZHANG Zhe
A finite-time adaptive neural tracking control method is proposed for nonlinear pure-feedback systems with input saturation and output constraints.Finite-time control theoryBarrier Lyapunov functionand Radial Basis Function (RBF) neural network are used to design novel virtual and real input signalswhich solves the A finite-time adaptive neural tracking control method is proposed for nonlinear pure-feedback systems with input saturation and output constraints.Finite-time control theoryBarrier Lyapunov functionand Radial Basis Function (RBF) neural network are used to design novel virtual and real input signalswhich solves the finite-time control problem of nonlinear pure-feedback systems with input saturation and output constraintsand ensures that the output of the system can track the reference signal within a finite time and the tracking error of the system is limited to a small neighborhood of the origin within a finite time under the condition of satisfying input saturation and output constraints.Finallya simulation experiment has clarified the effectiveness of the designed controller..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 11 (2021)
Multi-rotor Aircraft Control Based on Cascade PID for Precisely Hovering over Fixed Point
ZHAO Jie, CHEN Zhikun, and ZHANG Ruicheng
In order to control multi-rotor aircraft to hover stably and precisely over a fixed point,position and attitude controllers are designed by using cascade PID to control the position and attitude of the multi-rotor aircraft.A mathematical model is established after kinematics and dynamics analysis of the multi-rotor.BasIn order to control multi-rotor aircraft to hover stably and precisely over a fixed point,position and attitude controllers are designed by using cascade PID to control the position and attitude of the multi-rotor aircraft.A mathematical model is established after kinematics and dynamics analysis of the multi-rotor.Based on the analysis of the modela control allocation model is established.In order to simplify the design of controllersthe controllers are divided into two partsnamelyposition and attitude controller and control allocator.Changing the control allocator can realize the flight control of different rotorswhich has wider applicability.Simulation results show that the multi-rotor UAV has fast response speed with the stages of vertical take-off and level flight connected closelyand can accurately reach the given target point and hover stably over it..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 17 (2021)
Optimal Setting Control of Systems with Multi-source Disturbances Based on Disturbance Observer
ZHOU Hongwei, YIN Liping, CAI Di, and CHEN Xin
As for the linear systems with multi-source disturbancesa two-level optimal setting control method based on disturbance observer is studied.For the disturbances without a complete and accurate modela disturbance observer is designed.For the norm-bounded external disturbances which cannot be described by the disturbanAs for the linear systems with multi-source disturbancesa two-level optimal setting control method based on disturbance observer is studied.For the disturbances without a complete and accurate modela disturbance observer is designed.For the norm-bounded external disturbances which cannot be described by the disturbance observera dynamic optimal setting control scheme is provided.According to the observation value of the disturbance observerthe set value is adjusted dynamicallyso that the controlled output can still track the set point under the action of the original controller when there are multi-source disturbances in the system.Numerical simulations have verified the feasibility and effectiveness of this method..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 21 (2021)
Evaluation of Safety Target Level of UAV System Based on Monte-Carlo Simulation
ZHANG Honghong, GAN Xusheng, WU Yarong, BI Kexin, and LYU Zhihu
A risk assessment method based on Monte-Carlo is proposed to solve the safety problem of UAV system when entering the integrated airspace to perform different tasks.Firstlythe factors affecting the ground impact events of the UAV system in the fused airspace are analyzed.Thenthe parameter distribution is used to descA risk assessment method based on Monte-Carlo is proposed to solve the safety problem of UAV system when entering the integrated airspace to perform different tasks.Firstlythe factors affecting the ground impact events of the UAV system in the fused airspace are analyzed.Thenthe parameter distribution is used to describe the uncertainty of each influencing factor.Finallytwo typical UAVsnamelyFirebird and Typhoon Hare selected to conduct safety assessment using Monte-Carlo simulation algorithm in the low-risk areathe general risk area and the high-risk areaand the sensitivity analysis of each influencing factor is carried out.Simulation shows that different types of UAV system under different operation environment have big differences in safety target leveland UAV falling down angle is the key factor influencing the allowed failure rate.The method provides a feasible way of thinking for operational risk evaluation when UAV system entering the integrated airspaceand can enhance UAV safety level..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 26 (2021)
Saturation Attack of UAV Swarm Based on Improved Consensus Algorithm
LU Xiaoan, PU Huangzhong, ZHEN Ziyang, CHEN Yan, and ZHANG Danmeng
It is difficult for a single UAV to attack high-value targets with tight air-defense system.To solve the problemthis paper adopts a saturation attack technology applied to low-cost UAV swarmand proposes a three-stage saturation attack strategy with consensus under cooperative control.Based on the characteristics of tIt is difficult for a single UAV to attack high-value targets with tight air-defense system.To solve the problemthis paper adopts a saturation attack technology applied to low-cost UAV swarmand proposes a three-stage saturation attack strategy with consensus under cooperative control.Based on the characteristics of tasks at different stagesthe improved consensus algorithm is designed correspondingly for each phase.On the basis of UAV cooperation under multiple conditions in saturation attack tasksDubins curve is introduced to add flight trajectory constraintsso as to smooth UAV flight trajectory and shorten the flying distance.In the mission scenario of high-precision formation keepingan improved second-order consensus controller is designed to ensure flight precision and speed up convergence.Finallythe actual effects of the improved algorithm at each stage is compared with that of the traditional algorithm to verify its effectiveness and extensibility.Simulation results show that the algorithm can be applied to large-scale UAV swarm with satisfying effectswhich provides a basis and reference for the decision makingdeployment and tactical implementation of saturation attack strategies..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 31 (2021)
On Systematization of Aircraft/Store Electrical Interconnection System
SHI Zhizhao, GAO Zhongchang, ZHANG Pingxin, and GUO Wenli
Aircraft/Store Electrical Interconnection System (AEIS) needs to be more universalized in the integration of all sorts of domestic aircraft platforms with the stores of large/medium-sizedsmall-sized and miniature weapons.In this papera systematic solution is presented.Firstthe development tendencies of relative techAircraft/Store Electrical Interconnection System (AEIS) needs to be more universalized in the integration of all sorts of domestic aircraft platforms with the stores of large/medium-sizedsmall-sized and miniature weapons.In this papera systematic solution is presented.Firstthe development tendencies of relative technologies and relevant standards of AEIS at home and abroad are described.Thenan analysis is made to the composition of AEIS standard clusters and the evolvement of signal sets.Finallyideas and methods for systematized implementation of AEIS standards are proposed with a brief description of its application prospect..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 36 (2021)
Application of Fast and Adaptive Bidimensional Empirical Mode Decomposition to SAR Target Recognition
HU Yuanyuan, and HAN Yanlong
Fast and Adaptive Bidimensional Empirical Mode Decomposition (FABEMD) is applied to target recognition in Synthetic Aperture Radar (SAR) image.FABEMD could fast decompose SAR images into multiple Bidimensional Intrinsic Mode Functions (BIMF)which can describe the information of targets from low to high frequencies.TheFast and Adaptive Bidimensional Empirical Mode Decomposition (FABEMD) is applied to target recognition in Synthetic Aperture Radar (SAR) image.FABEMD could fast decompose SAR images into multiple Bidimensional Intrinsic Mode Functions (BIMF)which can describe the information of targets from low to high frequencies.The index of structural similarity is employed to remove the BIMFs that are contaminated by noisesand the highly discriminative ones are kept.In the classification phase,Joint Sparse Representation (JSR) is used to represent the selected BIMFs.Experiments are conducted on the MSTAR data set to test the proposed method and the results validate its performance superiority..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 40 (2021)
A Kernel Correlation Filter Tracking Algorithm Based on Re-detection Mechanism
SUN Xiaofeng, JIA Ziyan, ZHANG Lei, and WU Xuetao
The traditional Kernel Correlation Filter (KCF) tracking algorithm cannot handle well when the target is moving fast or has large-area occlusionwhich may cause the target to be lost. Based on the traditional KCF algorithmthis paper proposes three mechanismsnamelytarget loss detectionfirst frame re-detection and exThe traditional Kernel Correlation Filter (KCF) tracking algorithm cannot handle well when the target is moving fast or has large-area occlusionwhich may cause the target to be lost. Based on the traditional KCF algorithmthis paper proposes three mechanismsnamelytarget loss detectionfirst frame re-detection and extended area re-detectionto solve the above problems.The maximum response score and Average Peak Correlation Energy (APCE)are used to determine whether the target is missing.When the target is about to be lostthe extended area re-detection mechanism is adopted. When the target image is similar to the first-frame image of the targetthe first frame re-detection mechanism is adopted. In order to reflect the tracking performance of the proposed algorithm14 sets of video sequences were selected from the VOT2016 and OTB100 data sets as the test setsin which 7 sets of video sequences had the scenarios of target occlusion and fast motion.A quantitative comparative experiment shows thatcompared with the traditional KCF algorithmthe improved algorithm reduces the average Center Position Error (CPE) by 20 pixelsand increases the average Overlapping Rate (OR) by 16.1%..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 44 (2021)
Multi-Pursuer and Single-Evader Model of UAVs Based on Semi-direct Method
SHI Guangpu
This paper introduces a novel method that solves the Multi-Pursuer and Single-Evader (MPSE) UAV confrontation problem based on the semi-direct method.Firstlythe theory of the semi-direct method is introduced.In this methodcalculus of variations is used to convert the bilateral optimization problem into a unilateral oThis paper introduces a novel method that solves the Multi-Pursuer and Single-Evader (MPSE) UAV confrontation problem based on the semi-direct method.Firstlythe theory of the semi-direct method is introduced.In this methodcalculus of variations is used to convert the bilateral optimization problem into a unilateral optimization problemwhich is then converted into a nonlinear programming problem by using Legendre pseudo-spectrum method.The mathematical models of the two sides of the MPSE problem are establishedthe objective functions of the two sides are givenand then the optimal flight path is obtained by using the semi-direct method.Secondlyin Matlab programming environmentthe Snopt tool kit is used for numerical simulationwhich proves the correctnesseffectiveness and rapidity of the algorithm.Finallythe traditional proportional navigation method is used for comparisonwhich verifies the applicability and interoperability of the algorithm..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 48 (2021)
Research Status of Ballistic Group Target Tracking Technology
GUO Qian, GONG Jian, CHEN Geng, and ZHU Qinyu
Ballistic missile is a kind of high-performance offensive weapon.In the process of penetrationit will adopt a series of penetration technologies and form ballistic group targetswhich makes it difficult for our radar to track the target.Thereforehow to stably track ballistic group targets with high precision becomes Ballistic missile is a kind of high-performance offensive weapon.In the process of penetrationit will adopt a series of penetration technologies and form ballistic group targetswhich makes it difficult for our radar to track the target.Thereforehow to stably track ballistic group targets with high precision becomes the key to solve this problem.The idea of ballistic group target tracking is comprehensively introduced.According to the framework of ballistic group target trackingthe realization algorithms of each function unit are summarized.The basic principles and characteristics of the group initiation algorithmthe group combination/separation algorithmand the multiple target tracking algorithm with data association and data non-association are mainly expoundedand the development direction of ballistic group target tracking technology is described from four aspects..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 53 (2021)
A Survey on Autonomous Collision Avoidance Algorithms for UAVs at Low Altitude
LI Anti, WU Dingjie, and LI Chenglong
With the extensive application of civil UAV technologythe practice of integrating UAV into national airspaceand executing flight missions with manned aircraft in shared airspace at low altitude has become a trend of future development.UAV “sensing and avoiding” system plays a crucial role in ensuring flight safety inWith the extensive application of civil UAV technologythe practice of integrating UAV into national airspaceand executing flight missions with manned aircraft in shared airspace at low altitude has become a trend of future development.UAV “sensing and avoiding” system plays a crucial role in ensuring flight safety in the integrated airspace in the futureand the autonomous collision avoidance algorithm is a key part to ensure efficient operation of the whole system.At presentthe research on autonomous collision avoidance algorithms of the UAV has been very in-depth.The existing collision avoidance algorithms are classified based on the characteristics and mechanism of collision avoidancedifferent types of collision avoidance algorithms are introduced in detailand their advantages and limitations are expounded.Finallythe development direction of autonomous collision avoidance algorithms for UAVs is prospected..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 59 (2021)
Analysis on Development of IRST Multi-target Tracking Technologie
sHOU Lin, and YANG Shunhua
Infrared Search and Tracking (IRST) system has become one of the main equipment for battlefield perception owing to its advantages such as strong anti-EMI (Electromagnetic Interference) abilitypassive detectionperfect concealmenthigh positioning accuracyand strong ability to detect stealth targets.However limited Infrared Search and Tracking (IRST) system has become one of the main equipment for battlefield perception owing to its advantages such as strong anti-EMI (Electromagnetic Interference) abilitypassive detectionperfect concealmenthigh positioning accuracyand strong ability to detect stealth targets.However limited by its own detection mechanismIRST has such problems as incomplete dimension of detected informationlong search durationlow data update rateand susceptibility to clouds.According to the working principle of IRSTthe characteristics of it in target detection are analyzed.The mainstream target motion model in maneuvering target tracking is introducedand three kinds of traditional Multi-Target Tracking (MTT) technologies are introducedwhich are MTT based on Joint Probabilistic Data Association (JPDA) MTT based on Random Finite Sets (RFS) and MTT based on deep learning.Finallythe prospect of MTT technologies is given..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 65 (2021)
On Improvement of Methods for Missile Miss Distance Measurement
BI Yue, and FENG Yuguang
The target-borne equipment of missile miss distance measurement systems is easily damagedand current mainstream missile miss distance measurement systems are expensive and cumbersome.In view of the above problemsthe development trend of missile miss distance measurement is analyzed.A few miss distance measurement metThe target-borne equipment of missile miss distance measurement systems is easily damagedand current mainstream missile miss distance measurement systems are expensive and cumbersome.In view of the above problemsthe development trend of missile miss distance measurement is analyzed.A few miss distance measurement methods and their technological advances in recent years are analyzedin which a method with the greatest application potential is obtained.The study is of great significance for improving current missile miss distance measurement systems and enhancing the performance of missile miss distance measurement..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 71 (2021)
Dynamics Boundary Protection for Aircraft Landing Based on Reachable Set
QIU Xiaonan, ZHANG Jiuxing, LI Yinghui, LI Xiaohua, and DONG Zehong
The dynamics boundary and its protection strategy for landing when aircraft system failure occurs is studied.The longitudinal dynamics model of an aircraft under system failure is established with a certain transport aircraft as the research object.To solve the problem that the failure of the system may lead to loss ofThe dynamics boundary and its protection strategy for landing when aircraft system failure occurs is studied.The longitudinal dynamics model of an aircraft under system failure is established with a certain transport aircraft as the research object.To solve the problem that the failure of the system may lead to loss of control in flighta dynamics boundary determination method based on the reachability set theory is proposedand then the situations of elevator jamming and thrust loss are analyzed respectively.In order to ensure the safety of landing under system failurea dynamics boundary protection system is designed and the effectiveness of the system is verified through dynamics simulation.The research results can provide a new idea for the design of boundary protection systems for aircraft landing..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 77 (2021)
Identification of LDPC Code Length and Code Word Starting Point Based on Minimum Error Judgment Criterion
LIU Renxin, ZHANG limin, ZHONG Zhaogen, and SUN Xueli
The existing LDPC code open set recognition algorithm uses the code length and the starting point of the code word as known conditions for recognitionwhich limits the practical application of the algorithm.In order to overcome this shortcomingthis paper proposes a code length and code word starting point recognition The existing LDPC code open set recognition algorithm uses the code length and the starting point of the code word as known conditions for recognitionwhich limits the practical application of the algorithm.In order to overcome this shortcomingthis paper proposes a code length and code word starting point recognition algorithm based on the minimum error judgment criterion.Firstthe received sequence is intercepted according to the estimated value of the code length and the code word starting point to construct a code word analysis matrixand then Gaussian column transformation is conducted on the analysis matrix and possible check vectors are obtained.The LDPC code check vector is further selected based on the minimum error judgment criterionand finally the maximum number of check vectors at different traversal values of code lengths and code word starting point is foundso as to realize code length and code word starting point identification.The simulation experiment results show that when the bit error rate is on the level of 10-3the recognition rate of the algorithm reaches 100% for the LDPC code under the IEEE802.16E protocol..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 82 (2021)
A Method for Identifying the Fixed Point in UAV Fixed-Point Landing
CHEN Zhikun, ZHANG Bo, and CHENG Pengfei
After completion of a planting protection operationthe UAV needs to land autonomously.The landing of conventional UAVs is usually assisted by their own GPS systembut big errors will occur when the system is applied to small UAVs in precise positioning.To address this issuefor the situation when the UAV needs to landAfter completion of a planting protection operationthe UAV needs to land autonomously.The landing of conventional UAVs is usually assisted by their own GPS systembut big errors will occur when the system is applied to small UAVs in precise positioning.To address this issuefor the situation when the UAV needs to land at a fixed pointa fixed-point recognition method based on the machine vision system is studied.Firstlya specific landmark is set as the fixed pointand different color values in the image captured by the machine vision system are extracted.After color value extractionexcept the color of the fixed pointthe interference information of all the other colors is filtered.Thenthe shape information of all the elements in the image is analyzed.After the shape analysisall the elements whose shape doesnt accord with the shape of the fixed point are excluded.The contour of the landmark is identified through Canny edge detection.A plane coordinate system is set upand the specific location of the landmark in the coordinate system is calculated by using the pixel information obtained from edge detection.Finallyexperimental results show that the machine vision system can assist the UAV to precisely land at the fixed point..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 88 (2021)
Influence of Laser Phase Noise on Performance of Coherent Lidar
CAI Meng, ZHENG Wei, WANG Zhaohui, JING Chenrui, and MA Sai
Firstthe characteristics of laser phase noise under different laser linewidth conditions are analyzed.Thena theoretical model of the influence of laser phase noise on detection performance of coherent lidar is established.Finallythe influence of laser phase noise on performance of coherent lidar is analyzed by statiFirstthe characteristics of laser phase noise under different laser linewidth conditions are analyzed.Thena theoretical model of the influence of laser phase noise on detection performance of coherent lidar is established.Finallythe influence of laser phase noise on performance of coherent lidar is analyzed by statistical simulation specific to two typical cases including pulse coherent lidar and FMCW coherent lidar.The research results show that:1) In the case of pulsed laserthe influence of laser phase noise on detection performance has little relationship with detection rangeso it is unnecessary to restrict the detection range to be less than the coherent length;and 2) In the case of FMCW coherent lidarthe detection performance is much susceptible to laser phase noiseso it is necessary to restrict the detection range to be less than the coherent length with one order of magnitude..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 92 (2021)
FDNA-Based Emergent Failure Model of Aircraft System Safety
CHEN Yujin, XU Jihui, SHI Jiahui, and MIN Xiangshuo
Aiming at the safety failure accident caused by the system dependency relationshipthis paper constructs a system safety network based on the dependency relationship according to the logic of “liveware-environment-software-hardware”and analyzes the mechanism of emergent failure of safety.A system safety network framewAiming at the safety failure accident caused by the system dependency relationshipthis paper constructs a system safety network based on the dependency relationship according to the logic of “liveware-environment-software-hardware”and analyzes the mechanism of emergent failure of safety.A system safety network framework based on interaction behavior is establishedand the method of Functional Dependency Network Analysis (FDNA) is improved accordingly.Cascading failure is used to characterize the emergent failureand a numerical simulation method of emergent failure of aircraft system safety based on cascading failure is proposed.The evolution relationship between system components and interaction behavior is analyzed.The network damage mode under different failure modes is obtained.The simulation results show that：1) The emergent failure process of aircraft system safety needs to consider both the topology and the safety benefits；and 2) Emergent failure of safety can have a serious impact on system safety performance..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 96 (2021)
Detection of Weak Targets on Sea Surface Based on Optimized ESMD-ICA
TANG Jianjun, LIU Zhikun, LIANG Hao, ZHU Zhangqin, and JIN Lin
In order to detect weak targets on sea surface in the background of strong sea cluttera detection algorithm based on optimized ESMD-ICA is proposed.The wavelet modulus maxima denoising algorithm is used to denoise the signalthen the ESMD-ICA denoising algorithm is optimizedand finally the ELM model improved by Gray In order to detect weak targets on sea surface in the background of strong sea cluttera detection algorithm based on optimized ESMD-ICA is proposed.The wavelet modulus maxima denoising algorithm is used to denoise the signalthen the ESMD-ICA denoising algorithm is optimizedand finally the ELM model improved by Gray Wolf Optimization (GWO) is used to predict the reconstructed denoised signal.IPIX radar measurement data is used to verify the new algorithm.The experimental results show that the new algorithm does not destroy the chaotic property of the signal under the premise of suppressing sea clutterand the detection performance of the new prediction model is much better than that of the traditional prediction model (BP neural network).The new algorithm performs well in denoising effectmodel training and detecting timedetector stability and so onwhich is conducive to its wide application in practical engineering..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 101 (2021)
Enchantment of Vector Tracking Loop Performance Under Signal Challenging Environments
FAN Yue, and ZHOU Hui
Global Navigation Satellite System (GNSS) has become the most popular apparatus for generating navigation and positioning informationand ground vehiclessmartphones et al all rely on GNSS for obtaining high-precision navigation and positioning information.Howeverunder complex city environmentsGNSS signals are often Global Navigation Satellite System (GNSS) has become the most popular apparatus for generating navigation and positioning informationand ground vehiclessmartphones et al all rely on GNSS for obtaining high-precision navigation and positioning information.Howeverunder complex city environmentsGNSS signals are often blocked by the surroundingsand thus the GNSS receiver cant obtain adequate signalswhich may lead to big positioning errors or no output of navigation solutions.Vector Tracking Loops (VTL) use a Kalman filter to estimate the navigation and positioning solutionsand VTL is able to output positioning information with only one visible satellite.Howeverthe positioning errors will diverge over time.In order to improve the VTL performance under signal challenging environmentsthis paper proposes an altitude information aided VTL methodand the model is given.Field tests show that the positioning errors are obviously reduced in the two-minute experiment with the aid of altitude information..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 106 (2021)
A High-Security Design of ARINC818 Based on FPGA
ZHENG Yongrui, LIN Qiuhua, FENG Xiaowang, and WANG Quanzhong
ARINC818 is widely applied in aircraft systems both at home and abroad due to its high bandwidthlow latencynon-compressed Digital Video Interface (DVI)strong anti-EMI (Electromagnetic Interference) ability and light weight.There are high requirements on the safety of avionics systemsso a high-security design of ARIARINC818 is widely applied in aircraft systems both at home and abroad due to its high bandwidthlow latencynon-compressed Digital Video Interface (DVI)strong anti-EMI (Electromagnetic Interference) ability and light weight.There are high requirements on the safety of avionics systemsso a high-security design of ARINC818 has become one of the most important considerations in airworthiness certification.This paper proposes a high-security design of ARINC818whose validity and feasibility are proved by fault injection and other tests..
Electronics Optics & Control
- Publication Date: Jan. 01, 1900
- Vol. 28, Issue 8, 110 (2021)
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