Description: Automatic target detection in SAR image is the first stage in the ATR (Automatic Target Recognition) system. It is very important to improve the computing efficiency of the whole system. A conventional automatic target detection method is CFAR (constant false alarm rate) which is based only on the amplitude, discards the phase and thereby sacrifices half information of the SAR imagery. Almost each CFAR brings a large number of false alarms. 2L-IHP (two-look internal Hermitian product) is a new method which exploits the phase and amplitude information. In this paper, both CFAR and 2L-IHP algotithms are compared with an emphasis on 2L-IHP. The 2L-IHP algorithm for target detection is discussed briefly first. In order to apply it widely, it is modified to circumvent the constraint of the data. For polarimetric SAR images, PWF (Polarimetric Whitening Filter) is used to generate an image for target detection. According to ADTS data set, these algorithms are analyzed and evaluated respectively. C-、L- and P- band AIRSAR data are also processed, and some tentative conclusions are derived: Considering the penetrating ability of the microwave, L-band got the best detection accuracy of the three bands; HH polarization performed better for target detection than VV and HV polarization; Moreover, because more information is contained in polarimetric SAR data, here, we conclude that polarimetric SAR data have advantages over single polarized SAR data when they are applied for target detection. But all these conclusions need further validation. Platform: |
Size: 288371 |
Author:xbtown@126.com |
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Description: 锁相回路可视为一个输出相位和输入相位的回授系统用以同步输入参考讯号和回授后输出信号。并让其操作同样的频率。如(图一)所示，简单锁相回路[3,4]是由三个电路构成，分别为相位侦测器（Phase Detector）、回路滤波器（Loop Filter）、压控荡器（VCO）-phase-locked loop can be regarded as a phase output and input phase feedback system for synchronous reference input and feedback signals After the output signal. And allowed to operate the same frequency. If (Figure 1), the simple lock-loop [3,4] by the three circuit. for the detection phase (Phase Detector), loop filter (Loop Filter), VCO finishes (VCO) Platform: |
Size: 149504 |
Author:王浩 |
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Description: 数字信号处理器在三相无刷直流电机、三相全控整流电路在线检测、数字变频启动控制系统的应用-Digital signal processors in the three-phase brushless DC motor, three-phase full-controlled rectifier line detection, digital frequency conversion control system to start the application Platform: |
Size: 142336 |
Author:frank |
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Description: 利用单片机实现三相电源的相序检测
利用单片机实现三相电源的相序检测-Realize the use of single-chip three-phase power supply phase sequence detection using single-chip realization of three-phase power supply phase sequence detection Platform: |
Size: 221184 |
Author:fsdfsd |
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Description: 能实现对三相电流的实时检测功能,并具有长延时 短延时 瞬时 接地四断保护功能.-Can realize real-time on the three-phase current detection, and has a short latency transient长延时four broken grounding protection. Platform: |
Size: 16384 |
Author:杨利峰 |
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Description: 基于 PLC935单片机的三相漏电检测系统，可采集三相线的电压，电流值，并将采集的数值通过485总线返回上位机-PLC935-based single-chip three-phase leakage detection system can collect three-phase line voltage, current value, and acquisition of values through the 485 bus to return to PC Platform: |
Size: 258048 |
Author:雷永连 |
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Description: S3C44B0X嵌入式处理器与ADS7864的接口技术，可以方便地应用到三相电力参数检测、无功补偿控制、电能质量分析和分布式
电力监控等领域。-S3C44B0X embedded processor with the ADS7864 interface technology, can be easily applied to the detection of three-phase power parameters, reactive compensation control, power quality analysis and monitoring of areas such as distributed power Platform: |
Size: 705536 |
Author:唐斌 |
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Description: As the energy metering industry converts from electromechanical meters to more-accurate solid-state meters, power-system designers have a chance to incorporate new features that weren’t previously possible. In demand now are solid-state meters that measure energy more accurately than electromechanical meters, incorporate multiple-rate billing, and are capable of being read remotely by the utility company. This article describes how the AD7755 Energy Meter integrated circuit could be used in three-phase energy metering with power outage detection and measurement backup, and remote, automated, multiple-rate metering. Platform: |
Size: 236544 |
Author:tommyalf |
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Description: 三相交流电在国民经济中应用广泛，电路的畅通对工业生产极为重要。由于某种原因造成某相交流电断电，会造成重大的经济损失，因而对线路的检测是十分必要的。单片机三相交流电断相远程报警器，以8051单片机为核心，对三相线路进行不间断检测。当某相线路断电时，不仅可进行近程声光报警，还可进行远程声报警。-Three-phase alternating current widely used in the national economy, the circuit flow of traffic on the industrial production of paramount importance. For some causes of a phase AC power, will cause major economic losses, and thus the line detection is very necessary. SCM-phase long-range three-phase alternating current alarm to 8051 as the core, non-stop for three-phase circuit testing. When a phase power line, not only can be short-range sound and light alarm, sound alarm can also be remote. Platform: |
Size: 266240 |
Author:Alex |
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Description: 一个开发电梯模型用的小程序,基于AT89S51单片机,可以实现根据按键要求,电梯有厢体在不同的楼层停止.可以做为教学实验之用,程序已经测试过,楼层检测使用红外对管.电机使用三相步进电机.驱动使用LM298.-A development model with a small lift procedure, based on AT89S51 microcontroller, can be achieved under the key requirements of the lift with envelope in a different floor to stop. Can be used as a teaching experiment, the program has been tested, the floor of the tube using an infrared detection. Motor using the three-phase stepper motor. drive to use LM298. Platform: |
Size: 19456 |
Author:杜冬 |
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Description: 基于pq谐波电流检测的三相三线制有源滤波器模型。-Pq harmonic current detection based on three-phase three-wire active filter model. Platform: |
Size: 20480 |
Author:Qiu lin |
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Description: This paper proposes an open switch faults detection and localization algorithm for shunt three
phase active filter topology. It mainly details converter configuration and examines a simple and
reliable optimised fault diagnosis method. The con verter topology is based on classical three-leg
active power filter topology. A ne w fault diagnosis method is proposed, based on classical
currents measurements. It includes combinatory logic to analyse and validate error signals. A
Hysteresis Control is applied before and after fault detection, which avoids any controller
reconfiguration. Simulation results obtained with Matlab/Simulink/Plecs tools prove the
effectiveness of this method. -This paper proposes an open switch faults detection and localization algorithm for shunt three
phase active filter topology. It mainly details converter configuration and examines a simple and
reliable optimised fault diagnosis method. The con verter topology is based on classical three-leg
active power filter topology. A ne w fault diagnosis method is proposed, based on classical
currents measurements. It includes combinatory logic to analyse and validate error signals. A
Hysteresis Control is applied before and after fault detection, which avoids any controller
reconfiguration. Simulation results obtained with Matlab/Simulink/Plecs tools prove the
effectiveness of this method. Platform: |
Size: 314368 |
Author:nek |
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Description: The fault of broken rotor bars in a three phase induction motor is diagnosed by using the wavelet multiresolution analysis Platform: |
Size: 520192 |
Author:yamaka02 |
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