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Novel non-coherent integration method using binary phase-coded radar signal 认领 引用 被引量：3
1
作者 田黎育 何苗 +1 位作者 刘斌 傅雄军 《Journal of Beijing Institute of Technology》 EI CAS 2013年第1期60-66,共7页
The m series with 511 bits is taken as an example being applied in non-coherent integra- tion algorithm. A method to choose the bi-phase code is presented, which is 15 kinds of codes are picked out of 511 kinds of m s... The m series with 511 bits is taken as an example being applied in non-coherent integra- tion algorithm. A method to choose the bi-phase code is presented, which is 15 kinds of codes are picked out of 511 kinds of m series to do non-coherent integration. It is indicated that the power in- creasing times of larger target sidelobe is less than the power increasing times of smaller target main- lobe because of the larger target＇ s pseudo-randomness. Smaller target is integrated from larger tar- get sidelobe, which strengthens the detection capability of radar for smaller targets. According to the sidelobes distributing characteristic, a method is presented in this paper to remove the estimated sidelobes mean value for signal detection after non-coherent integration. Simulation results present that the SNR of small target can be improved approximately 6. 5 dB by the proposed method. 展开更多
关键词 binary phase-coded signal non-coherent integration code agility peak sidelobe level（PSL） mainlobe-peak sidelobe ratio
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Space-Borne Interferometers to Detect Thousands of Memory Signals Emitted by Stellar-Mass Binary Black Holes 认领 引用
2
作者 Shaoqi Hou Zhi-Chao Zhao +1 位作者 Zhoujian Cao Zong-Hong Zhu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第10期323-330,共8页
The gravitational memory effect manifests gravitational nonlinearity,degenerate vacua,and asymptotic symmetries;its detection is considered challenging.We propose using a space-borne interferometer to detect memory si... The gravitational memory effect manifests gravitational nonlinearity,degenerate vacua,and asymptotic symmetries;its detection is considered challenging.We propose using a space-borne interferometer to detect memory signals from stellar-mass binary black holes(BBHs),typically targeted by ground-based detectors.We use DECIGO detector as an example.Over 5 years,DECIGO is estimated to detect approximately 2,036 memory signals(SNRs>3)from stellar-mass BBHs.Simulations used frequency-domain memory waveforms for direct SNR estimation.Predictions utilized a GWTC-3 constrained BBH population model(Power law+Peak mass,DEFAULT spin,Madau-Dickinson merger rate).The analysis used conservative lower merger rate limits and considered orbital eccentricity.The high detection rate stems from strong memory signals within DECIGO’s bandwidth and the abundance of stellar-mass BBHs.This substantial and conservative detection count enables statistical use of the memory effect for fundamental physics and astrophysics.DECIGO exemplifies that space interferometers may better detect memory signals from smaller mass binaries than their typical targets.Detectors in lower frequency bands are expected to find strong memory signals from∼104M⊙binaries. 展开更多
关键词 space borne interferometer detect memory signals gravitational memory effect decigo detector binary black holes bbhs typically stellar mass binary black holes signal noise ratio
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Implementation of a kind of FPGA-based binary phase coded radar signal processor architecture 认领 引用 被引量：1
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作者 田黎育 孙密 万阳良 《Journal of Beijing Institute of Technology》 EI CAS 2012年第4期526-531,共6页
A flexible field programmable gate array based radar signal processor is presented. The radar signal processor mainly consists of five functional modules： radar system timer, binary phase coded pulse compression（PC... A flexible field programmable gate array based radar signal processor is presented. The radar signal processor mainly consists of five functional modules： radar system timer, binary phase coded pulse compression（PC）, moving target detection （MTD）, constant false alarm rate （CFAR） and target dots processing. Preliminary target dots information is obtained in PC, MTD, and CFAR modules and Nios I! CPU is used for target dots combination and false sidelobe target removing. Sys- tem on programmable chip （SOPC） technique is adopted in the system in which SDRAM is used to cache data. Finally, a FPGA-based binary phase coded radar signal processor is realized and simula- tion result is given. 展开更多
关键词 field programmable gate array（FPGA） radar signal processor system on programma-ble chip （SOPC） binary phase coded
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Blind parameter estimation of pseudo-random binary code-linear frequency modulation signal based on Duffing oscillator at low SNR 认领 引用 被引量：1
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作者 Ke Wang Xiaopeng Yan† +2 位作者 Ze Li Xinhong Hao Honghai Yu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第5期312-319,共8页
Conventional parameter estimation methods for pseudo-random binary code-linear frequency modulation(PRBC-LFM)signals require prior knowledge,are computationally complex,and exhibit poor performance at low signal-to-no... Conventional parameter estimation methods for pseudo-random binary code-linear frequency modulation(PRBC-LFM)signals require prior knowledge,are computationally complex,and exhibit poor performance at low signal-to-noise ratios(SNRs).To overcome these problems,a blind parameter estimation method based on a Duffing oscillator array is proposed.A new relationship formula among the state of the Duffing oscillator,the pseudo-random sequence of the PRBC-LFM signal,and the frequency difference between the PRBC-LFM signal and the periodic driving force signal of the Duffing oscillator is derived,providing the theoretical basis for blind parameter estimation.Methods based on amplitude method,short-time Fourier transform method,and power spectrum entropy method are used to binarize the output of the Duffing oscillator array,and their performance is compared.The pseudo-random sequence is estimated using Duffing oscillator array synchronization,and the carrier frequency parameters are obtained by the relational expressions and characteristics of the difference frequency.Simulation results show that this blind estimation method overcomes limitations in prior knowledge and maintains good parameter estimation performance up to an SNR of-35 dB. 展开更多
关键词 Duffing oscillator pseudo-random binary code-linear frequency modulation(PRBC-LFM)signal blind parameter estimation low signal-to-noise ratio(SNR)
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CRAMER-RAO BOUNDS FOR PARAMETER ESTIMATION OF PHASE-CODING SIGNALS 认领 引用
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作者 HuangChunlin JiangWengli ZhouYiyu 《Journal of Electronics(China)》 2005年第1期1-8,共8页
In this paper, Cramer-Rao Bound (CRB) is derived from phase-coding signal with additive white noise, where three important parameters are focused on: carrier frequency, chip width and amplitude. Simplified and close f... In this paper, Cramer-Rao Bound (CRB) is derived from phase-coding signal with additive white noise, where three important parameters are focused on: carrier frequency, chip width and amplitude. Simplified and close form expressions of CRB are obtained through complicated derivation, and then are applied to evaluate the performance of the cyclic estimator.The results are accurate enough and serve well as benchmark for evaluating the performance of parameter estimation method. Numerical simulations illustrate the accuracy and applicability of the derived CRB. 展开更多
关键词 Cramer-Rao Bound (CRB) Phase-coding signal Parameter estimation
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Looking at the Physics of What a Quark Star-Black Hole Binary Would Create in Terms of GW Signals and New Physics 认领 引用
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2021年第4期1255-1263,共9页
A quark star, black hole pairing as a would-be Gravitational wave generator is brought up. Quark stars are, anyway, likely to be black holes, above a certain mass limit, whereas a quark star in itself obey thermodynam... A quark star, black hole pairing as a would-be Gravitational wave generator is brought up. Quark stars are, anyway, likely to be black holes, above a certain mass limit, whereas a quark star in itself obey thermodynamic “laws” which in certain ways differ from the traditional black hole models. We list some of the probable consequences of such a binary, and make predictions as to certain GW phenomenon which will have observational consequences. i.e., a GW “change in energy” from a black hole—Quark star pair would likely be within 90% of that of comparatively massed black hole—black hole binary pair. The electromagnetic “profile” of the two cases would differ dramatically, and we conclude our inquiry with an open question if a generalized uncertainty principle could play a role in comparing the 7th and 8th equations of our presentation. 展开更多
关键词 GW Signals Quark Star-Black Hole Binary New Physics
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Numerical modeling of DPSK pressure signals and their transmission characteristics in mud channels 认领 引用 被引量：11
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作者 Shen Yue Su Yinao +2 位作者 Li Gensheng Li Lin Tian Shouceng 《Petroleum Science》 SCIE CAS 2009年第3期266-270,共5页
A numerical model and transmission characteristic analysis of DPSK （differential phase shift keying） pressure signals in mud channels is introduced. With the control logic analysis of the rotary valve mud telemetry,... A numerical model and transmission characteristic analysis of DPSK （differential phase shift keying） pressure signals in mud channels is introduced. With the control logic analysis of the rotary valve mud telemetry, a logical control signal is built from a Gate function sequence according to the binary symbols of transmitted data and a phase-shift function is obtained by integrating the logical control signal. A mathematical model of the DPSK pressure signal is built based on principles of communications by modulating carrier phase with the phase-shift function and a numerical simulation of the pressure wave is implemented with the mathematical model by MATLAB programming. Considering drillpipe pressure and drilling fluid temperature profile along drillpipes, the drillpipe of a vertical well is divided into a number of sections. With water-based drilling fluids, the impacts of travel distance, carrier frequency, drillpipe size, and drilling fluids on the signal transmission were studied by signal transmission characteristic analysis for all the sections. Numerical calculation results indicate that the influences of the viscosity of drilling fluids and volume fraction of gas in drilling fluids on the DPSK signal transmission are more notable than the others and the signal will distort in waveform with differential attenuations of the signal frequent component. 展开更多
关键词 Measurement while drilling （MWD） modulation binary symbol mathematical model numerical simulation differential phase shift keying （DPSK） signal transmission characteristics
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Polyphase coded signal design for MIMO radar using MO-MicPSO 认领 引用 被引量：10
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作者 Xiangneng Zeng Yongshun Zhang Yiduo Guo 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2011年第3期381-386,共6页
A novel modified optimization technique known as the multi-objective micro particle swarm optimization(MO-MicPSO)is proposed for polyphase coded signal design.The proposed MO-MicPSO requires only a small population si... A novel modified optimization technique known as the multi-objective micro particle swarm optimization(MO-MicPSO)is proposed for polyphase coded signal design.The proposed MO-MicPSO requires only a small population size compared with the standard particle swarm optimization that uses a larger population size.This new method is guided by an elite archive to finish the multi-objective optimization.The orthogonal polyphase coded signal(OPCS)can fundamentally improve the multiple input multiple output(MIMO)radar system performance,with which the radar system has high resolution and abundant signal channels.Simulation results on the polyphase coded signal design show that the MO-MicPSO can perform quite well for this high-dimensional multi-objective optimized problem.Compared with particle swarm optimization or genetic algorithm,the proposed MO-MicPSO has a better optimized efficiency and less time consumption. 展开更多
关键词 multi-objective micro particle swarm optimization(MO-MicPSO) phase-coded signal multiple input multiple output(MIMO)radar ambiguity function.
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Quality monitoring and biases estimation of BOC navigation signals 认领 引用 被引量：1
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作者 ZHAO Hongwei ZHANG Zichun +1 位作者 LUO Xianzhi WANG Qiuping 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2019年第3期474-484,共11页
Many safety-critical applications that utilize the global navigation satellite system (GNSS) demand highly accurate positioning information, as well as highly integrity and reliability. Due to GNSS signals are easily ... Many safety-critical applications that utilize the global navigation satellite system (GNSS) demand highly accurate positioning information, as well as highly integrity and reliability. Due to GNSS signals are easily distorted by the interferences or disturbances, the signal quality monitoring (SQM) is necessary to detect the presence of dangerous signal distortions. In this paper, we developed an SQM software for binary offset carrier (BOC) modulated navigation signals. Firstly, the models of BOC signal with ideal and distortion are presented respectively. Then the architecture of SQM software is proposed. Moreover, the effect of the white gaussian noise (WGN) and the front-end filter on the correlation peak of the receiver is analyzed. Finally, the biases induced by the signal distortion are evaluated. The experiments simulate the relationships between the code phase shift and the normalized correlation value in the case of the signal digital distortion and the analog distortion. The simulation results demonstrate that the proposed SQM method can effectively monitor the signal distortion and accurately estimate the correlation peak deviation caused by the distortion. 展开更多
关键词 signal quality monitoring (SQM) binary offset carrier (BOC) modulation biases estimation signal distortion correlation peak
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AltBOC navigation signal quality assessment and measurement 认领 引用 被引量：2
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作者 孟庆丰 焦国太 薛强强 《Journal of Measurement Science and Instrumentation》 CAS 2013年第3期289-293,共5页
In order to ensure that Chinese BeiDou satellite navigation system runs smoothly,the assessment of signal quality has become a significant task.Alternative binary offset carrier(AltBOC)is BeiDou B2 frequency signal.Th... In order to ensure that Chinese BeiDou satellite navigation system runs smoothly,the assessment of signal quality has become a significant task.Alternative binary offset carrier(AltBOC)is BeiDou B2 frequency signal.The acquisition of BeiDou signal is processed in off-line mode and the evaluation is performed by taking signal power spectrum,eye diagram,constellation,correlation,loss and s-curve deviation on AltBOC as signal quality evaluation parameters.The results illustrate that the new system signal,namely AltBOC signal,has the best performance in code tracking precision,anti-jamming and anti-multipath. 展开更多
关键词 TN911.7signal quality assessment alternative binary offset carrier（Alt-BOC） correlation loss s-curve biasCLC number：TN911.7 Document code：AArticle ID：1674-8042（2013）03-0289-05
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AI-Driven FBMC-OQAM Signal Recognition via Transform Channel Convolution Strategy 认领 引用
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作者 Zeliang An Tianqi Zhang +3 位作者 Debang Liu Yuqing Xu Gert Frølund Pedersen Ming Shen 《Computers, Materials & Continua》 SCIE EI 2023年第9期2817-2834,共18页
With the advent of the Industry 5.0 era,the Internet of Things(IoT)devices face unprecedented proliferation,requiring higher communications rates and lower transmission delays.Considering its high spectrum efficiency,... With the advent of the Industry 5.0 era,the Internet of Things(IoT)devices face unprecedented proliferation,requiring higher communications rates and lower transmission delays.Considering its high spectrum efficiency,the promising filter bank multicarrier(FBMC)technique using offset quadrature amplitude modulation(OQAM)has been applied to Beyond 5G(B5G)industry IoT networks.However,due to the broadcasting nature of wireless channels,the FBMC-OQAMindustry IoT network is inevitably vulnerable to adversary attacks frommalicious IoT nodes.The FBMC-OQAMindustry cognitive radio network(ICRNet)is proposed to ensure security at the physical layer to tackle the above challenge.As a pivotal step of ICRNet,blind modulation recognition(BMR)can detect and recognize the modulation type of malicious signals.The previous works need to accomplish the BMR task of FBMC-OQAM signals in ICRNet nodes.A novel FBMC BMR algorithm is proposed with the transform channel convolution network(TCCNet)rather than a complicated two-dimensional convolution.Firstly,this is achieved by designing a low-complexity binary constellation diagram(BCD)gridding matrix as the input of TCCNet.Then,a transform channel convolution strategy is developed to convert the image-like BCD matrix into a serieslike data format,accelerating the BMR process while keeping discriminative features.Monte Carlo experimental results demonstrate that the proposed TCCNet obtains a performance gain of 8%and 40%over the traditional inphase/quadrature(I/Q)-based and constellation diagram(CD)-based methods at a signal noise ratio(SNR)of 12 dB,respectively.Moreover,the proposed TCCNet can achieve around 29.682 and 2.356 times faster than existing CD-Alex Network(CD-AlexNet)and I/Q-Convolutional Long Deep Neural Network(I/Q-CLDNN)algorithms,respectively. 展开更多
关键词 Intelligent signal recognition FBMC-OQAM industrial cognitive radio networks binary constellation diagram transform channel convolution
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基于神经网络的电子合成器信号分离模块优化研究 认领 引用
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作者 拓琰 《自动化与仪器仪表》 2026年第6期383-387,共5页
针对传统电子合成器音乐信号分离效果不佳的问题,提出一种基于深度神经网络的电子合成器信号分离方法。首先,根据DNN神经网络结构特性,构建一个信号分离基础模型;之后为实现音乐信号中人声与伴奏的有效区分,提出在DNN神经网络基础上分... 针对传统电子合成器音乐信号分离效果不佳的问题,提出一种基于深度神经网络的电子合成器信号分离方法。首先,根据DNN神经网络结构特性,构建一个信号分离基础模型;之后为实现音乐信号中人声与伴奏的有效区分,提出在DNN神经网络基础上分别增加区分性目标函数与二值时频掩蔽模型,通过两种方式联合优化音乐信号中人声、伴奏;最后利用SSA算法对DNN神经网络模型进行参数优化求解。实验结果表明,提出的基于区分性训练-二值时频掩蔽-SSA-DNN的信号分离方法可获取电子合成器音乐信号的特征,其对某一音乐片段分离的GNSDR、GSIR和GSAR值分别为10.645、14.502和13.158,均高于另外三种分离方法。综合分析证明,采用本方法可实现电子合成器音乐信号的有效分离,满足实际分离效果,具备可靠性和稳定性。 展开更多
关键词 DNN神经网络 电子合成器 信号分离 区分性训练 二值时频掩蔽
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An innovative detection method of high frequency BPSK signal with low signal-to-noise ratio 认领 引用 被引量：3
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作者 石硕 徐立振 +1 位作者 顾学迈 张宏莉 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第6期93-99,共7页
Based on chaotic oscillator system, this paper proposes a novel method on high frequency low signal- to-noise ratio BPSK（ Binary Phase Shift Keying） signal detection. Chaotic oscillator system is a typical non-lin- ... Based on chaotic oscillator system, this paper proposes a novel method on high frequency low signal- to-noise ratio BPSK（ Binary Phase Shift Keying） signal detection. Chaotic oscillator system is a typical non-lin- ear system which is sensitive to periodic signals and immune to noise at the same time. Those properties make it possible to detect low signal-to-noise ratio signals. The BPSK signal is a common signal type which is widely used in modern communication. Starting from the analysis of advantages of chaotic, os~.illator system and signal features of the BPSK signal, we put forward a unique method that can detect low signar-to-noise ratio BPSK sig- nals with high frequency. The simulation results show that the novel method can dclct.t low signal-to-noise ratio BPSK signals with frequency in an order of magnitude of l0s Hz, and the input Signal-to-Noise Ratio threshold can be -20 dB. 展开更多
关键词 low signal-to-noise ratio signal detection chaotic oscillator system Binary Phase Shift Keying high frequency
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ANALYSIS OF AFFECTIVE ECG SIGNALS TOWARD EMOTION RECOGNITION 认领 引用 被引量：2
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作者 Xu Ya Liu Guangyuan +2 位作者 Hao Min Wen Wanhui Huang Xiting 《Journal of Electronics(China)》 2010年第1期8-14,共7页
Recently,as recognizing emotion has been one of the hallmarks of affective computing,more attention has been paid to physiological signals for emotion recognition.This paper presented an approach to emotion recognitio... Recently,as recognizing emotion has been one of the hallmarks of affective computing,more attention has been paid to physiological signals for emotion recognition.This paper presented an approach to emotion recognition using ElectroCardioGraphy(ECG) signals from multiple subjects.To collect reliable affective ECG data,we applied an arousal method by movie clips to make subjects experience specific emotions without external interference.Through precise location of P-QRS-T wave by continuous wavelet transform,an amount of ECG features was extracted sufficiently.Since feature selection is a combination optimization problem,Improved Binary Particle Swarm Optimization(IBPSO) based on neighborhood search was applied to search out effective features to improve classification results of emotion states with the help of fisher or K-Nearest Neighbor(KNN) classifier.In the experiment,it is shown that the approach is successful and the effective features got from ECG signals can express emotion states excellently. 展开更多
关键词 Emotion recognition ElectroCardioCraphy （ECG） signal Continuous wavelet transform Improved Binary Particle Swarm Optimization （IBPSO） Neighborhood search
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Properties of Paths in ROBDD and Its Application to Signal Probability Calculations 认领 引用 被引量：2
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作者 吴凯 林争辉 《Journal of Donghua University(English Edition)》 EI CAS 2004年第2期116-118,共3页
The properties of the paths in an ROBDD representation of a Boolean function are presented and proved in the present paper, and the applications of ROBDD in calculating signal probability are also discussed. By this m... The properties of the paths in an ROBDD representation of a Boolean function are presented and proved in the present paper, and the applications of ROBDD in calculating signal probability are also discussed. By this method, the troublesome calculation of the correlation among the nodes, which is caused by the re-convergent fan-out in digital system, can be avoided and power estimation can be faster than simulation-based method in [1]. 展开更多
关键词 signal probability Binary Decision Diagram (BDD) Ordered Binary Decision Diagram (OBDD) Reduced Ordered Binary Decision Diagram (ROBDD) variable ordering inconsistent events
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Research and Implementation of Beidou-3 Satellite Multi-Band Signal Acquisition and Tracking Method 认领 引用 被引量：2
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作者 CHEN Shuhao MAO Xuchu 《Journal of Shanghai Jiaotong university(Science)》 EI 2019年第5期571-578,共8页
A new acquisition and tracking method is proposed for signal processing under the new signal system structure of Beidou-3 navigation satellite system(BDS-3). By starting with the analysis of the characteristics and si... A new acquisition and tracking method is proposed for signal processing under the new signal system structure of Beidou-3 navigation satellite system(BDS-3). By starting with the analysis of the characteristics and signal structure of the new signal, the local replica of the ranging code and the study of the characteristics of the ranging code are completed, which proves that the method in this paper can be used in the subsequent acquisition and tracking process. The fast Fourier transformation(FFT) search based on longer coherence time and the adaptive phase-frequency switching carrier tracking loop are proposed for signals in different modulation modes. The actual signal of Beidou-3 satellite is sampled by local experiment, and the acquisition and tracking of the Beidou-3 satellite multi-band signal is finally completed. The tracking results verify the feasibility of the proposed acquisition and tracking method. 展开更多
关键词 Beidou-3 navigation satellite system(BDS-3) binary offset carrier(BOC) B1C signal B3I signal acquisition and tracking method
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BINARY LEAST SQUARES:AN ALGORITHM FOR BINARY SPARSE SIGNAL RECOVERY 认领 引用 被引量：1
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作者 Jinming Wen 《Journal of Computational Mathematics》 SCIE CSCD 2025年第2期493-514,共22页
A fundamental problem in some applications including group testing and communications is to acquire the support of a K-sparse signal x,whose nonzero elements are 1,from an underdetermined noisy linear model.This paper... A fundamental problem in some applications including group testing and communications is to acquire the support of a K-sparse signal x,whose nonzero elements are 1,from an underdetermined noisy linear model.This paper first designs an algorithm called binary least squares(BLS)to reconstruct x and analyzes its complexity.Then,we establish two sufficient conditions for the exact reconstruction of x’s support with K iterations of BLS based on the mutual coherence and restricted isometry property of the measurement matrix,respectively.Finally,extensive numerical tests are performed to compare the efficiency and effectiveness of BLS with those of batch orthogonal matching pursuit(BatchOMP)which to our best knowledge is the fastest implementation of OMP,orthogonal least squares(OLS),compressive sampling matching pursuit(CoSaMP),hard thresholding pursuit(HTP),Newton-step-based iterative hard thresholding(NSIHT),Newton-step-based hard thresholding pursuit(NSHTP),binary matching pursuit(BMP)andΙ1-regularized least squares.Test results show that:(1)BLS can be 10-200 times more efficient than Batch-OMP,OLS,CoSaMP,HTP,NSIHT and NSHTP with higher probability of support reconstruction,and the improvement can be 20%-80%;(2)BLS has more than 25%improvement on the support reconstruction probability than the explicit BMP algorithm with a little higher computational complexity;(3)BLS is around 100 times faster thanΙ1regularized least squares with lower support reconstruction probability for small K and higher support reconstruction probability for large K.Numerical tests on the generalized space shift keying(GSSK)detection indicate that although BLS is a little slower than BMP,it is more efficient than the other seven tested sparse recovery algorithms,and although it is less effective thanΙ1-regularized least squares,it is more effective than the other seven algorithms. 展开更多
关键词 Binary sparse signal Precise support reconstruction Binary least squares
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压电定位平台动态迟滞不确定性建模及H∞鲁棒控制 认领 引用 被引量：2
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作者 刘浩天 张桂林 周克敏 《控制理论与应用》 EI CAS CSCD 北大核心 2025年第6期1227-1236,共10页
本文为提高压电定位平台的跟踪精度及扰动抑制的能力,首先,在Prandtl-Ishlinskii模型建模及逆补偿的基础上,利用伪随机二值信号及相关函数计算方法辨识出伪线性动态系统的频率响应模型及标称模型.其次,在频域内对简化过程中的不确定性... 本文为提高压电定位平台的跟踪精度及扰动抑制的能力,首先,在Prandtl-Ishlinskii模型建模及逆补偿的基础上,利用伪随机二值信号及相关函数计算方法辨识出伪线性动态系统的频率响应模型及标称模型.其次,在频域内对简化过程中的不确定性进行建模.然后,考虑模型的加性不确定性、外界扰动及测量噪声的影响,设计H∞鲁棒控制器保证闭环鲁棒性,根据标称模型设计前馈控制器保证系统的跟踪精度.最后,实验结果表明:压电定位平台在H∞鲁棒控制器及前馈控制器作用下,可以有效地跟踪1~100 Hz频率范围内的多幅值及复合频率位移轨迹.对于多幅值位移轨迹,相对误差低于5.74%,均方根误差低于0.7174μm.对于复合频率位移轨迹,相对误差低于1.31%,均方根误差低于0.1375μm. 展开更多
关键词 压电定位平台 伪随机二值信号 频率响应模型 模型不确定性 H∞鲁棒控制
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天基合成孔径激光雷达空间目标成像系统分析 认领 引用 被引量：1
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作者 崔岸婧 高敬涵 +2 位作者 吴疆 杨宏 李道京 《激光技术》 CAS CSCD 北大核心 2025年第3期336-345,共10页
合成孔径激光雷达可用较小口径实现高分辨率成像,在天基空间目标观测方面具有重要应用价值,但存在波束宽度窄、覆盖范围有限、目标搜索捕获困难等问题。为了解决这些问题,采用一种主动激光与被动红外复合的天基合成孔径激光雷达空间目... 合成孔径激光雷达可用较小口径实现高分辨率成像,在天基空间目标观测方面具有重要应用价值,但存在波束宽度窄、覆盖范围有限、目标搜索捕获困难等问题。为了解决这些问题,采用一种主动激光与被动红外复合的天基合成孔径激光雷达空间目标成像系统,分析了系统指标,给出了成像仿真结果。结果表明,通过激光/红外共孔径实现了系统轻量化;综合使用圆偏振激光发射信号和正交线偏振两通道接收信号,结合顺轨干涉处理,解决了退偏和目标/平台振动问题;通过红外相机可实现目标搜索和跟踪,采用10 ns脉宽窄脉冲激光信号可实施目标测距和测速,使用10 ns脉宽、4 GHz带宽优化二进制相移键控信号,可实现0.10 m实时低分辨率成像和0.05 m高分辨率成像。系统设计方案对天基合成孔径激光雷达的研制具有参考价值。 展开更多
关键词 成像系统 空间目标成像 合成孔径激光雷达 激光红外复合成像 衍射光学系统 二进制相移键控信号
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一种自适应的机械振动信号变分模态分析方法 认领 引用 被引量：1
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作者 黎会鹏 徐波 黄璞 《电子测量技术》 北大核心 2025年第8期116-125,共10页
针对变分模态分解算法在处理多分量、非平稳机械振动信号时,性能受模态数量、二次惩罚参数及更新步长等关键因素严重影响的问题,提出了一种基于二叉树机制的自适应变分模态分解算法。以待分解信号的加权精细多尺度反向散布熵作为二次惩... 针对变分模态分解算法在处理多分量、非平稳机械振动信号时,性能受模态数量、二次惩罚参数及更新步长等关键因素严重影响的问题,提出了一种基于二叉树机制的自适应变分模态分解算法。以待分解信号的加权精细多尺度反向散布熵作为二次惩罚参数设定的依据,通过信号噪声程度调节算法更新步长,借助二分法机制持续将原始信号进行分解。不断优化二次惩罚参数与更新步长,将所得到分量之间的最小二乘互信息和重构误差构成作为分解完成评价指标,并对特征相似度较高的模态进行合并。算法综合考虑了模态提取性能所受内嵌参数的共同影响。通过仿真数据及实测机械振动信号验证,所提算法复杂度低,可有效缓解频带相近模态之间的混叠问题,完全自适应地提取振动信号特征模态。 展开更多
关键词 振动信号 变分模态分解 二叉树机制 最小二乘互信息 加权精细多尺度反向散布熵
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