IEEE Seventh SP Workshop on Statistical Signal and Array Processing最新文献_第10页

How to Treat the Reliability of Defect Detection and Assessment in Nondestructive Testing? 如何看待无损检测中缺陷检测与评估的可靠性?

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572540

C. Nockemann, G. Tillack, C. Bellon, K. Johannsen, S. Heine

引用次数: 0

Image Modeling And Restoration By Higher-order Statistics Based Inverse Filters 基于高阶统计量的反滤波图像建模与恢复

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572479

Chien-Chung Hsiao, Chong-Yung Chi

引用次数: 1

Computational Reductions Exploiting Structure in Forward/backward Data 利用正向/向后数据结构的计算约简

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572526

D. Linebarger, R.D. DeGroat, E. Dowling

引用次数: 0

Estimation of Signal Parameters for Optimal Array Filters 最优阵列滤波器信号参数估计

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572504

P. Musumeci

引用次数: 0

On Time Delay Estimation 关于时延估计

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572438

H. Messer, P. M. Schultheiss

引用次数: 87

Estimation of Multichannel Mixed Spectra 多通道混合光谱的估计

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572425

V. Nagesha, S. Kay

引用次数: 7

Set Theoretic Signal Processing 集合论信号处理

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572418

P. L. Combettes

引用次数: 1

Maximum Likelihood Estimation of Multiple Damped Sinusoids by Using Newton's Iterations and Improved Initialization 基于牛顿迭代和改进初始化的多阻尼正弦波极大似然估计

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572423

Jeng-Kuang Hwang, Jiunn-Horng Denq

{"title":"Maximum Likelihood Estimation of Multiple Damped Sinusoids by Using Newton's Iterations and Improved Initialization","authors":"Jeng-Kuang Hwang, Jiunn-Horng Denq","doi":"10.1109/SSAP.1994.572423","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572423","url":null,"abstract":"The maximum likelihood parameter estimation of multiple damped sinusoids in noise is considered in this paper. Since the damped signal decays exponentially with time and each signal has two parameters to estimate, the ML criterion is very Mcu l t to optimize. In computing the MLE, it is noted that the convergence performance of the iterative algorithm is highly sensitive to the initial point. Thus we resort to a Newton-type ML algorithm equipped with an improved initialization scheme, which comkts of a robust state-space method followed by a reibing alternating \" b a t i o n (AM) procedure. Performance simutation shows that the overall ML algorithm can achieve the CR bound with a lower threshold SNR than other existing methods. lies on how to optimize the highly nonlinear and multidimensional ML Criterion [3-51. As is well known, a key to the global convergence of the ML algorithm is the determination of the initial point. In this paper, we present a two-step initialization scheme for finding a more stable initial point. The first step is a polynomialbased state space method that can resuit in stable estimates of the damping fixtors, and the second step is a rething alternating \" b a t i o n (AM) methd used to find more accurate frequency estimates [4]. Once the initialization is completed, Newton-type iterations similar to that in [5] are perfiormed in the main loop to optimize the ML criterion. In the following sections, we will present the problem formulation and the overall ML algorithm. Then its superior performance, as compared to other methods, is confirmed by computer simulations.","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127167010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identifiability in Array Processing Models with Vector-Sensor Applications 矢量传感器在阵列处理模型中的可识别性

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572457

B. Hochwald, A. Nehorai

引用次数: 196

Spectral Design of Randomized Pulse Width Modulation in DC to AC Converters 直流-交流变换器随机脉宽调制的频谱设计

IEEE Seventh SP Workshop on Statistical Signal and Array Processing Pub Date : 1994-06-26 DOI: 10.1109/SSAP.1994.572524

R. Kirlin, A. Trzynadlowski

{"title":"Spectral Design of Randomized Pulse Width Modulation in DC to AC Converters","authors":"R. Kirlin, A. Trzynadlowski","doi":"10.1109/SSAP.1994.572524","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572524","url":null,"abstract":"This paper presents several new results and ideas. First the harmonic spectrum and power spectral density (noise density) of random width modulation for minimum loss vector PWM is analyzed and plots for one case of modulation and randomization parameters are given. As a result of the analysis of this modulation scheme, a novel time-domain formulation (autocorrelation) of the spectral information is presented. In this form we find all of the necessary details for understanding the mechanisms of general randomization schemes for suppressing harmonics and converting harmonic power to the noise spectral density. The insights found in the autocorrelation expressions allow at least one optimum design of the randomization parameters of any PWM method. The proposed optimization is but one of many indicated and implied by our methods. Introduction Research on random pulse width modulation (RPWM) techniques for static power converters, mainly three -phase inverters, has recently gained momentum. Initiated by our paper [l] in 1987, in 1992 alone the studies on various WWM issues were reported in over a dozen publications [2]. The RPWM techniques have been found to significantly improve the noise and vibration characteristics of converter-fed motors in adjustable speed drive systems [3,4]. Figure 1 shows both deterministic and random switching rate or random width P W M signals for producing ac from a dc source. The deterministic pattern is often calculated to maximize fundamental power while sometimes nulling or minimizing some selected harmonics. However all deterministic modulations have exactly the same switching patterns in all periods of the fundamental. This naturally leads to harmonics. The basic principle of RPWM consists in introduction of a random factor to the switching patterns of the controlled converter. With regard to three-phase inverters, each cycle of the output voltage is generated by a different randomized combination of pulses of the a(t) deterministic PWM T I","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":"265 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123269588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7