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[OtherANALYSIS OF MAN-MADE TARGET DETECTION IN SAR IMAGERY

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 | Hits:

[GDI-BitmapATR2

Description: 针对航空照片中自动目标识别的复杂性.该文提出了一种基于神经网络的自动目标识别算法, 算法包括检测和虚警排除两个阶段.检1删阶段是在整幅区域中i挂行快速搜寻.找出所有可能的目标 虚 警排障阶段是对检测阶段得到的结果进行进一步的验证, 在尽可能保留全部真目标的前提下,将伪目标 排除.实验结果证明了算法的可行性. 关键词 神经网络,航空照片, 自动目标识别-against aerial photographs Automatic Target Recognition of complexity. This paper presents a neural network-based automatic target recognition algorithm, the algorithm including the detection and false alarm ruled out in two stages. Frederick stage is a cut in the whole region i linked to fast-track the search. To identify all possible targets false alarm remove obstacles stage of the testing phase results further verification, reservations at all possible real targets on the premise that goal will be to exclude false. Experimental results demonstrate the feasibility of the algorithm. Keywords neural network, aerial photographs, automatic target recognition
Platform: | Size: 134144 | Author: 陈文清 | Hits:

[Special Effectscfar_wt2

Description: 这是一个横虚惊概率的程序,也叫CFAR,可以实现雷达图像数据的恒虚警检测-This is a cross false alarm probability procedures, also known as CFAR, can realize the radar image data CFAR detection
Platform: | Size: 1024 | Author: 朱阳阳 | Hits:

[ARM-PowerPC-ColdFire-MIPScalcCFARthreshold

Description: Compute Classical detection threshold for radar detection under additive Gaussian white noise criterion and specified false alarm probability. -Compute Classical detection threshold for radar detection under additive Gaussian white noise criterion and specified false alarm probability.
Platform: | Size: 1024 | Author: mid | Hits:

[matlabcalcMofNCFARthreshold

Description: Compute Classical CFAR binary detection threshold for radar detection under additive Gaussian white noise criterion and specified false alarm probability. -Compute Classical CFAR binary detection threshold for radar detection under additive Gaussian white noise criterion and specified false alarm probability.
Platform: | Size: 3072 | Author: mid | Hits:

[Industry researchpaper01

Description: A FFT-based partial matched filter (PMF) acquisition threshold setting method for fast GPS acquisition is presented. Normal distribution and numerical fitting technique instead of real decision variable (DV) distribution are used in derivation to approximate the threshold expression, and the modification method for the threshold expression is also presented. The threshold expression is based on the individual FFT Doppler bin false alarm probability rather than the convention whole detector false alarm probability. The proposed threshold expression can be adjusted according to the false alarm probability, the noncoherent accumulation (NCA) length and the estimated noise variance. Furthermore we discuss the implementation of zero-padding FFT with its advantage and limitation. The performance is superior compared to the reference method in terms of signal-to-noise ratio (SNR) when detection and false alarm probabilities are used as measurement criteria.
Platform: | Size: 280576 | Author: zohreh | Hits:

[matlabcfar

Description: 衡虚警检测的程序,不敢独享,与大家分享!希望对大家有帮助-Value false alarm detection procedures, not exclusive, to share with you! We want to help
Platform: | Size: 1024 | Author: 蒋继菲 | Hits:

[OtherAnalysis_of_CA-CFAR_Processorsfor_Linear-Law_Detec

Description: 提供一个cell-weraging constant false alarm rate (CA-CFAR)的算法,基于信号检测的方法。-We present a method for evaluating the performance of cell-weraging constant false alarm rate (CA-CFAR) processors which use the anplitude of echo signals rather than their squared amplitude Results are presented for the case of Rayleigh clutler/mise statistics for which some sirnulatiom have been reported recently by other authors [:I. Detection probabilities are evaluated for the case of a Rayleigh fluctuating target embedded in Rayleigh clutter/noise for linear-law CA-CFAR processors. These results are observed to be practically identical to those of square-law CA-CFAR processors for which analytical expressions are readily available. We also verify these observations using Monte Carlo simulations. The same conelusion is reached in the case of a nonfluctuating target embedded in Rayleigh clutter/noise for which only simulation results are presented here.
Platform: | Size: 348160 | Author: wang zhuo | Hits:

[matlabradar-detection

Description: 雷达检测处理仿真程序,包括噪声背景下的检测,波动目标的检测,检测概率与虚警概率的计算-the simulation code for radar detection,including detection in the presence of noise,detection of fluctuating target, probability of false alarm and probability of detection
Platform: | Size: 19456 | Author: 张晓斌 | Hits:

[Software EngineeringVHDL_fire_alarm_detection

Description: vhdl source code of fire detection system/fire alarm system especially for high rise building? This among the requirement :- according to my "fire detection system for tall building" project by using Spartan 3E FPGA, the vhdl program need to include all of dis specification:- First of all, we ll put sensor/smoke detector each floor in the tall building. 1) alarm ll activated if the sensor/smoke detector sense a fire 2)at the same time, the actuator will activate in order to control such a elevator and any other machines in the building. 3)the controller will display which floor caught by fire and the sensor/smoke detector initial or current temperature. 4)If there is false alarm, we can stop it by push the reset button .-vhdl source code of fire detection system/fire alarm system especially for high rise building? This is among the requirement :- according to my "fire detection system for tall building" project by using Spartan 3E FPGA, the vhdl program need to include all of dis specification:- First of all, we ll put sensor/smoke detector each floor in the tall building. 1) alarm ll activated if the sensor/smoke detector sense a fire 2)at the same time, the actuator will activate in order to control such a elevator and any other machines in the building. 3)the controller will display which floor caught by fire and the sensor/smoke detector initial or current temperature. 4)If there is false alarm, we can stop it by push the reset button .
Platform: | Size: 1024 | Author: subin | Hits:

[matlabRadarSignalProcess

Description: 常用的雷达信号处理程序,包括恒虚警检测、脉冲压缩以及动目标指示。-Commonly used in radar signal processing procedures, including the constant false alarm detection, pulse compression, moving target indicator.
Platform: | Size: 1024 | Author: 袁浩 | Hits:

[Other1

Description: 为了提高认知无线电中感知用户对授权用户(主用户) 的检测概率,提出一种新的基于循环 谱统计量的主用户信号检测算法. 该算法利用循环谱离散频域平滑方法,对信号的循环谱在循环频 率处建立合理的检测统计量,然后求解得到对应不同虚警概率的判决门限,以使感知用户能检测信 噪比更低的授权用户信号.-To increase the detection probability of sensing users for licenced users (primary signals) in the cognitive radio , it put s forward a new primary users signal method based on cyclic spect rum statis2 tics. By using discrete f requency smoothing of cyclic spect rum , this algorithm establishes the reason2 able detection statistics on the cyclic f requency of signal cyclic spect rum , then solves and obtains the decision threshold correspond to different false alarm probability , as a result , making the sensing users can detect licenced users signal under lower signal in noise ratio (SNR) .
Platform: | Size: 486400 | Author: 刘德龙 | Hits:

[Algorithmcfar

Description: Radar constant false alarm rate(CFAR)detection is addressed in this correspondence.Motivated by the frequently encountered problem of clutter-edge heterogeneity,we modelthe secondary data as aprobability mixture and impose a hierarchical modelfor the inference problem.A two-stage CFAR detector stucture is proposed.
Platform: | Size: 225280 | Author: Hansa | Hits:

[matlabRadar_Simulation

Description: 雷达系统仿真,采用相位编码脉内线性调频混合调制信号。该雷达具有数字化正交解调、脉冲压缩处理、固定目标对消、动目标检测(MTD)、和恒虚警(CFAR)处理等功能-Radar simulation system,using the LFM and barker code mixed modulated signal。Main function include:digital orthogonal demodulationfixed, Pulse compression,target cancellation, moving object detection (MTD), and the constant false-alarm (CFAR) processing etc
Platform: | Size: 3072 | Author: | Hits:

[Industry researchAnAnomalyBasedApproachforIntrusion

Description: A new system for web attack detection is presented. It follows the anomaly-based approach, therefore known and unknown attacks can be detected. The system relies on a XML file to classify the incoming requests as normal or anomalous. The XML file, which is built from only normal traffic, contains a description of the normal behavior of the target web application statistically characterized. Any request which deviates from the normal behavior is considered an attack. The system has been applied to protect a real web application. An increasing number of training requests have been used to train the system. Experiments show that when the XML file has enough information to closely characterize the normal behavior of the target web application, a very high detection rate is reached while the false alarm rate remains very low.
Platform: | Size: 688128 | Author: keerthi | Hits:

[matlabenergy-detection

Description: 本程序给出了认知无线电中的能量检测方法,并实现了在不同的虚警概率下的检测性能比较。-This procedure gives the method of energy detection of cognitive radio , and the comparison of detection performance at different false alarm probability .
Platform: | Size: 1024 | Author: 张欢欢 | Hits:

[matlabMAT-files

Description: spectrum sensing detection and false alarm probability
Platform: | Size: 6144 | Author: Ritesh chanchal | Hits:

[matlabMatlab-rayleigh

Description: Matlab能量检测在rayleigh衰落信道下的性能仿真,主要为虚警概率和误警概率的关系-Matlab energy detection in rayleigh fading channel the performance simulation, mainly for the false alarm probability and the relationship between the probability of false alarm
Platform: | Size: 5120 | Author: 苗苗 | Hits:

[matlabsingle_CR_Pd_vs_Pf

Description: matlab环境下单个节点能量感知的检测概率与虚警概率-energy of a single node under matlab perceived probability of detection and false alarm probability
Platform: | Size: 7168 | Author: 何智锋 | Hits:

[Software EngineeringActive-sonar-detection

Description: 主动声纳恒虚警检测,包括常见的几种恒虚警检测以及相应的融合检测-Active sonar constant false alarm detection, including several kinds of common constant false alarm detection and the corresponding integration testing
Platform: | Size: 3970048 | Author: 阿松 | Hits:
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