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基于位置旋转变换和非均匀快速傅立叶变换的机动目标高效相参检测 Research Articles

靳科1,赖涛2,齐艳丽3,黄洁1,赵拥军1

《信息与电子工程前沿(英文)》 2020年 第21卷 第8期   页码 1251-1266 doi: 10.1631/FITEE.1900272

摘要: 提出基于位置旋转变换和非均匀快速傅里叶变换的高效稳健相参积累方法。首先,利用二阶Keystone变换消除二次距离徙动。然后,利用旋转角度和多普勒频率之间的对应关系,构建相位补偿函数,从而利用位置旋转和非均匀快速傅里叶变换实现高效的参数估计。与现有代表性算法相比,所提算法能以较低运算复杂度实现近乎理想的检测性能。

关键词: 相参积累;机动目标;参数估计;位置旋转变换;非均匀快速傅立叶变换    

稀疏快速Clifford傅里叶变换 Article

Rui WANG, Yi-xuan ZHOU, Yan-liang JIN, Wen-ming CAO

《信息与电子工程前沿(英文)》 2017年 第18卷 第8期   页码 1131-1141 doi: 10.1631/FITEE.1500452

摘要: Clifford傅里叶变换(Clifford Fourier transform, CFT)可以应用于矢量场和标量场,但无法有效解决大数据问题,因为该算法是基于每个信号量计算的。稀疏快速傅里叶变换(sparse fast Fourier transform, sFFT)理论通过选择性地使用输入数据来处理大数据问题。受之启发,我们提出一个称为稀疏快速Clifford傅里叶变换(sparse fast CFT, SFCFT)的算法,该算法能够大幅度提高在标量场和矢量场中的计算性能。

关键词: 稀疏快速傅里叶变换(sFFT);Clifford傅里叶变换(CFT);稀疏快速Clifford傅里叶变换(SFCFT);Clifford代数    

一种通过循环前缀再利用改善OFDM系统带宽的新型节能ICI消除技术 Article

Sandeep SAROWA, Harmanjeet SINGH, Sunil AGRAWAL, B. S. SOHI

《信息与电子工程前沿(英文)》 2017年 第18卷 第11期   页码 1892-1899 doi: 10.1631/FITEE.1601333

摘要: 作为一项非常有前景的技术,正交频分复用(orthogonal frequency division multiplexing, OFDM)解决了频谱分配中的带宽不足问题,引领了无线移动通信领域的发展。然而,多普勒频移和本地振荡器频率同步误差的存在会导致载波间干扰(inter carrier interference, ICI),严重影响了正交频分复用。以往文献中提出了许多ICI消除技术,例如自消除法(self-cancellation, SC),最大似然估计法(maximum likelihood estimation, MLE)和加窗法,但需要在带宽冗余和系统复杂度之间权衡。本文基于接收端循环前缀(cyclic prefix, CP)再利用,提出了一种节能且具有有效带宽的新技术来消除ICI。自消除法和最大似然估计法在发送端发送整个OFDM符号数据时会产生冗余,而本文提出的技术仅使用循环前缀数据(仅占总符号带宽的20%)来估计信道,产生与前两者类似结果的同时节省了大量带宽。仿真结果表明,该技术在误差性能方面有显著的改进;并且在实现高带宽增益的同时,能效也得到了实质性的改善。因此,该技术优于传统ICI消除技术。

关键词: 正交频分复用(orthogonal frequency division multiplexing     OFDM);快速傅立叶变换Fast Fourier transform, FFT);循环前缀(cyclic    

Identification of faults through wavelet transform vis-à-vis fast Fourier transform of noisy vibration

null

《机械工程前沿(英文)》 2014年 第9卷 第2期   页码 130-141 doi: 10.1007/s11465-014-0298-6

摘要:

Fault diagnosis of rolling element bearings requires efficient signal processing techniques. For this purpose, the performances of envelope detection with fast Fourier transform (FFT) and continuous wavelet transform (CWT) of vibration signals produced from a bearing with defects on inner race and rolling element, have been examined at low signal to noise ratio. Both simulated and experimental signals from identical bearings have been considered for the purpose of analysis. The bearings have been modeled as spring-mass-dashpot systems and the simulated signals have been obtained considering transfer functions for the bearing systems subjected to impulsive loads due to the defects. Frequency B spline wavelets have been applied for CWT and a discussion on wavelet selection has been presented for better effectiveness. Results show that use of CWT with the proposed wavelets overcomes the short coming of FFT while processing a noisy vibration signals for defect detection of bearings.

关键词: Fault detection     spline wavelet     continuous wavelet transform     fast Fourier transform    

一种快速均匀的采用尺度不变特征变换描述符进行基于内容的卫星图像配准方法 Article

Hamed BOZORGI, Ali JAFARI

《信息与电子工程前沿(英文)》 2017年 第18卷 第8期   页码 1108-1116 doi: 10.1631/FITEE.1500295

摘要: 尺度不变特征变换(scale-invariant feature transform, SIFT)算法是一种成功应用于卫星图像配准的算法。本地SIFT描述符被许多研究者应用于改进图像检索流程。

关键词: 基于内容的卫星图像配准;特征点分布;图像配准;线性判别准则;遥感;尺度不变特征变换    

使用傅里叶变换红外成像进行高通量筛选 Article

Erdem Sasmaz, Kathleen Mingle, Jochen Lauterbach

《工程(英文)》 2015年 第1卷 第2期   页码 234-242 doi: 10.15302/J-ENG-2015040

摘要: 在这些技术中,快速扫描傅里叶变换红外(FTIR) 成像是最快、最通用的筛选技术。本文介绍了16 通道高通量反应器的新设计,并给出了其准确性和重复性试验结果。

关键词: 高通量     傅里叶变换红外成像     筛选     氧化钴     一氧化碳氧化    

中国首个地基高分辨率傅里叶变换光谱观测站的大气成分长期观测研究 Article

刘诚, 孙友文, 单唱功, 王薇, Justus Notholt, Mathias Palm, 殷昊, 田园, 高吉熹, 毛慧琴

《工程(英文)》 2023年 第22卷 第3期   页码 201-214 doi: 10.1016/j.eng.2021.11.022

摘要: 本文对我国首个全球碳总柱观测网(TCCON)高分辨率傅里叶变换光谱仪(FTS)地基观测站,即合肥观测站开展了系统性研究。该观测站可观测30多种大气成分的柱总量和VMR廓线。

关键词: 遥感     傅里叶变换     大气污染     温室气体     气候变化    

碱处理对桉木纤维挤压结合机理的影响

彭万喜,林芝,李年存

《中国工程科学》 2014年 第16卷 第4期   页码 64-68

摘要:

采用桉木纤维为原料,探讨碱处理对板材挤压结合机理的影响。结果表明:碱处理对木质素、半纤维素都有不同程度的降解作用;在热压制板过程中,经过降解作用的木材成分经适当的热压工艺能够发生聚合反应从而粘合成板;强碱(NaOH)对桉木纤维的影响大于弱碱溶液(Na2CO3),且处理时间为10 h 较适宜;碱处理过程产生的活性羟基,热压后可以缔合形成氢键,增加了纤维之间的结合力,有利于桉木纤维自身粘合成板。

关键词: 桉木纤维     碱处理     傅立叶红外光谱     扫描电子显微镜(SEM)    

Control efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter vibrations in a cable stayed bridge

Nazim Abdul NARIMAN

《结构与土木工程前沿(英文)》 2017年 第11卷 第1期   页码 66-89 doi: 10.1007/s11709-016-0356-8

摘要: This paper studies optimization of three design parameters (mass ratio, frequency ratio and damping ratio) of multiple tuned mass dampers MTMDs that are applied in a cable stayed bridge excited by a strong wind using minimax optimization technique. ABAQUS finite element program is utilized to run numerical simulations with the support of MATLAB codes and Fast Fourier Transform FFT technique. The optimum values of these three parameters are validated with two benchmarks from the literature, first with Wang and coauthors and then with Lin and coauthors. The validation procedure detected a good agreement between the results. Box-Behnken experimental method is dedicated to formulate the surrogate models to represent the control efficiency of the vertical and torsional vibrations. Sobol’s sensitivity indices are calculated for the design parameters in addition to their interaction orders. The optimization results revealed better performance of the MTMDs in controlling the vertical and the torsional vibrations for higher mode shapes. Furthermore, the calculated rational effects of each design parameter facilitate to increase the control efficiency of the MTMDs in conjunction with the support of the surrogate models.

关键词: MTMDs     power spectral density     fast Fourier transform     minimax optimization technique     Sobol’s sensitivity indices     Box-Behnken method    

Thermogravimetric coupled with Fourier transform infrared analysis study on thermal treatment of monopotassium

Yuheng FENG, Xuguang JIANG, Yong CHI, Xiaodong LI, Hongmei ZHU

《环境科学与工程前沿(英文)》 2011年 第5卷 第2期   页码 186-192 doi: 10.1007/s11783-011-0322-6

摘要: In China, safe disposal of hazardous waste is more and more a necessity, urged by rapid economic development. The pyrolysis and combustion characteristics of a residue from producing monopotassium phosphate (monopotassium phosphate residue), considered as a hazardous waste, were studied using a thermogravimetric, coupled with Fourier transform infrared analyzer (TG-FTIR). Both pyrolysis and combustion runs can be subdivided into three stages: drying, thermal decomposition, and final devolatilization. The average weight loss rate during fast thermal decomposition stage in pyrolysis is higher than combustion. Acetic acid, methane, pentane, (acetyl) cyclopropane, 2,4,6-trichlorophenol, CO, and CO were distinguished in the pyrolysis process, while CO was the dominant combustion product.

关键词: hazardous waste     combustion     pyrolysis     thermogravimetric coupled with Fourier transform infrared analysis (TG-FTIR)     monopotassium phosphate residue    

一种抗RPE-LTP声码器压缩的端到端数据传输方法

陈立全,胡爱群,徐青,杨晓辉

《中国工程科学》 2007年 第9卷 第12期   页码 81-85

摘要: 根据RPE-LTP声码器特性,将待传输数据分别调制到正交的低频正弦载波上,用快速傅立叶变换运算实现信号的调制传输,调制后的波形符合声码器的时频特性。

关键词: 声码器;规则脉冲激励-长时预测;正交频分复用;快速傅立叶变换    

科里奥利质量流量计气液两相流信号处理的改进

李春辉1,孙立军1,刘佳荣1,张扬1,李海洋2,王化祥1

《信息与电子工程前沿(英文)》 2021年 第22卷 第2期   页码 141-286 doi: 10.1631/FITEE.1900558

摘要: 本文分析了3种数字信号处理方法——正交解调(QD)、希尔伯特和滑动离散傅立叶变换法,分别用于处理传感器信号并在两相流工况下测试算法性能。在此基础上,分别改进了两相流条件下的信号处理方法。

关键词: 科里奥利质量流量计;数字信号处理方法;两相流工况;正交解调;滑动离散傅里叶变换;希尔伯特变换    

An improved low-complexity sum-product decoding algorithm for low-density parity-check codes

Michaelraj Kingston ROBERTS,Ramesh JAYABALAN

《信息与电子工程前沿(英文)》 2015年 第16卷 第6期   页码 511-518 doi: 10.1631/FITEE.1400269

摘要: In this paper, an improved low-complexity sum-product decoding algorithm is presented for low-density parity-check (LDPC) codes. In the proposed algorithm, reduction in computational complexity is achieved by utilizing fast Fourier transform (FFT) with time shift in the check node process. The improvement in the decoding performance is achieved by utilizing an optimized integer constant in the variable node process. Simulation results show that the proposed algorithm achieves an overall coding gain improvement ranging from 0.04 to 0.46 dB. Moreover, when compared with the sum-product algorithm (SPA), the proposed decoding algorithm can achieve a reduction of 42%-67% of the total number of arithmetic operations required for the decoding process.

关键词: Computational complexity     Coding gain     Fast Fourier transform (FFT)     Low-density parity-check (LDPC) codes     Sum-product algorithm (SPA)    

Real time monitoring of bioreactor mAb IgG3 cell culture process dynamics via Fourier transform infrared

Huiquan Wu, Erik Read, Maury White, Brittany Chavez, Kurt Brorson, Cyrus Agarabi, Mansoor Khan

《化学科学与工程前沿(英文)》 2015年 第9卷 第3期   页码 386-406 doi: 10.1007/s11705-015-1533-3

摘要: Compared to small molecule process analytical technology (PAT) applications, biotechnology product PAT applications have certain unique challenges and opportunities. Understanding process dynamics of bioreactor cell culture process is essential to establish an appropriate process control strategy for biotechnology product PAT applications. Inline spectroscopic techniques for real time monitoring of bioreactor cell culture process have the distinct potential to develop PAT approaches in manufacturing biotechnology drug products. However, the use of inline Fourier transform infrared (FTIR) spectroscopic techniques for bioreactor cell culture process monitoring has not been reported. In this work, real time inline FTIR Spectroscopy was applied to a lab scale bioreactor mAb IgG3 cell culture fluid biomolecular dynamic model. The technical feasibility of using FTIR Spectroscopy for real time tracking and monitoring four key cell culture metabolites (including glucose, glutamine, lactate, and ammonia) and protein yield at increasing levels of complexity (simple binary system, fully formulated media, actual bioreactor cell culture process) was evaluated via a stepwise approach. The FTIR fingerprints of the key metabolites were identified. The multivariate partial least squares (PLS) calibration models were established to correlate the process FTIR spectra with the concentrations of key metabolites and protein yield of in-process samples, either individually for each metabolite and protein or globally for all four metabolites simultaneously. Applying the 2 derivative pre-processing algorithm to the FTIR spectra helps to reduce the number of PLS latent variables needed significantly and thus simplify the interpretation of the PLS models. The validated PLS models show promise in predicting the concentration profiles of glucose, glutamine, lactate, and ammonia and protein yield over the course of the bioreactor cell culture process. Therefore, this work demonstrated the technical feasibility of real time monitoring of the bioreactor cell culture process via FTIR spectroscopy. Its implications for enabling cell culture PAT were discussed.

关键词: process analytical technology (PAT)     Fourier-transform infrared (FTIR) spectroscopy     partial least squares (PLS) regression     mouse IgG3     bioreactor cell culture process     real time process monitoring    

基于四元数傅里叶变换和线性正则变换的二维四元数信号采样定理 Research Articles

胡晓晓1,程冬2,高洁欣3

《信息与电子工程前沿(英文)》 2022年 第23卷 第3期   页码 463-478 doi: 10.1631/FITEE.2000499

摘要: 本文主要研究在不同形式四元数傅里叶变换和线性正则变换下有限带宽四元数函数的采样定理。证明了有限带宽四元数函数可通过它们的直接采样或经过微分和希尔伯特变换后的采样重构。此外,讨论了不同形式变换下不同类型采样公式之间的关系。首先,如果四元数函数有限带宽区域是关于原点对称的矩形区域,则不同形式四元数傅里叶变换下四元数采样公式具有相同形式;否则,采样公式是不同的。其次,利用双边四元数傅里叶变换和线性正则变换的关系,得到不同形式四元数线性正则变换下有限带宽四元数函数采样定理。再次,分析了采样公式的截断误差。最后,通过仿真展示采样公式的应用。

关键词: 四元数傅里叶变换;四元数线性正则变换;采样定理;部分和总体四元数希尔伯特变换;部分和总体广义四元数希尔伯特变换;截断误差    

标题 作者 时间 类型 操作

基于位置旋转变换和非均匀快速傅立叶变换的机动目标高效相参检测

靳科1,赖涛2,齐艳丽3,黄洁1,赵拥军1

期刊论文

稀疏快速Clifford傅里叶变换

Rui WANG, Yi-xuan ZHOU, Yan-liang JIN, Wen-ming CAO

期刊论文

一种通过循环前缀再利用改善OFDM系统带宽的新型节能ICI消除技术

Sandeep SAROWA, Harmanjeet SINGH, Sunil AGRAWAL, B. S. SOHI

期刊论文

Identification of faults through wavelet transform vis-à-vis fast Fourier transform of noisy vibration

null

期刊论文

一种快速均匀的采用尺度不变特征变换描述符进行基于内容的卫星图像配准方法

Hamed BOZORGI, Ali JAFARI

期刊论文

使用傅里叶变换红外成像进行高通量筛选

Erdem Sasmaz, Kathleen Mingle, Jochen Lauterbach

期刊论文

中国首个地基高分辨率傅里叶变换光谱观测站的大气成分长期观测研究

刘诚, 孙友文, 单唱功, 王薇, Justus Notholt, Mathias Palm, 殷昊, 田园, 高吉熹, 毛慧琴

期刊论文

碱处理对桉木纤维挤压结合机理的影响

彭万喜,林芝,李年存

期刊论文

Control efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter vibrations in a cable stayed bridge

Nazim Abdul NARIMAN

期刊论文

Thermogravimetric coupled with Fourier transform infrared analysis study on thermal treatment of monopotassium

Yuheng FENG, Xuguang JIANG, Yong CHI, Xiaodong LI, Hongmei ZHU

期刊论文

一种抗RPE-LTP声码器压缩的端到端数据传输方法

陈立全,胡爱群,徐青,杨晓辉

期刊论文

科里奥利质量流量计气液两相流信号处理的改进

李春辉1,孙立军1,刘佳荣1,张扬1,李海洋2,王化祥1

期刊论文

An improved low-complexity sum-product decoding algorithm for low-density parity-check codes

Michaelraj Kingston ROBERTS,Ramesh JAYABALAN

期刊论文

Real time monitoring of bioreactor mAb IgG3 cell culture process dynamics via Fourier transform infrared

Huiquan Wu, Erik Read, Maury White, Brittany Chavez, Kurt Brorson, Cyrus Agarabi, Mansoor Khan

期刊论文

基于四元数傅里叶变换和线性正则变换的二维四元数信号采样定理

胡晓晓1,程冬2,高洁欣3

期刊论文