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虚警
    Calculating Formulae of Detection Probability and False-Alarm Probability of the Pulse-counter Detector of small Sliding Window
    小滑窗脉冲计数检测器发现概率与虚警概率的计算公式
    THE GEVT MIXED METHOD FOR THE CALCULATION OF FALSE-ALARM PROBABILITY OF RADAR DETECTORS
    计算雷达检测器虚警概率的GEVT混合法
    The modified generalized sign detector (MGSD) and the two-pole filter detector (TPFD) are simulated by the use of Monte Carlo method,to obtain the curves of their false-alarm probubility,detection probability and angular accuracy in Weibull noise.
    采用Monte Carlo法模拟了修正型广义符号检测器(MGSD)和双极点滤波器检测器(TPFD),给出了它们在Weibull噪声中的虚警概率检测概率和测角精度曲线。
    Experimental results show that when IR threshold coefficient is 2.0-2.4, more than 95% of the detection probability and lower false-alarm probability for targets with signal-clutter-ratio of 1 can be obtained by the algorithm.
    实验结果表明,红外阈值系数选取2.0-2.4时,算法可对信杂比为1的点目标实现高于95%的检测概率及较低的虚警率。
    2 Researching the constant false-alarm ratio (CFAR) detectionBased on the order statistics theory and CFAR method, a new kind of detection schemeand performance analysis method are put forward to detect the dependent target innonhomogeneous environment.
    2 恒虚警(CFAR)检测方案的探讨在对信号检测的基本理论进行深入研究的基础上,根据有序统计(OS)理
    With this criterion, two good algorithms are designed: inertia-based cut detection algorithm, and cut detection algorithm with constant false-alarm ratio (CFAR). The latter one translates the CFAR processing technique from radar signal detection into the field of video content analysis.
    设计了两个对视频序列性质具有鲁棒性的算法:基于惯性信息的切变检测算法和具有恒定虚警概率的切变检测算法,其中后者将雷达信号处理的恒虚警处理技术引入视频内容分析领域。
    A low-complexity CFAR (const false-alarm rate) frame detector is proposed, which exploits periodic structure of preamble and outperforms conventional autocorrelation detector.
    提出了一种基于周期序列的低复杂性、恒虚警帧检测器,它的性能优于常规的基于序列自相关检测器;
    This thesis mainly discussed the realization of Pulse-Doppler radar signal processing system. The signal processing system of this thesis is mainly composed of Pulse Compressing (PC) and Moving Target Detection (MTD) and Automatic Angle Detecting and Constant False-Alarm Rate(CFAR).
    本文研究的主要目的是实现某脉冲多普勒雷达信号处理机, 该信号处理机主要由脉冲压缩(PC),动目标检测(MTD),自动测角,恒虚警处理(CFAR)四个模块组成;
    If logarithmic begining point puts below 10db receiver noise level. It still has constant false-alarm rate characteristics.
    如果对数起点选在接收机噪声电平以下10分贝时,它还具有恒虚警特性。
    Ely comparison MGSD has an advantage over TPFD in that the former pcovides a constant false-alarm rate when the samples of the reference cells are independent and identical-ly distributed,besides,its defection prodability and angular accuracy in Weibull noise are higher when the signal-noise ratio is smaller,with a reduction in the effect of extraneous targer.
    与TPFD相比较,MGSD不仅当参考单元的样本为独立同分布时能提供恒虚警检测,而且在Weibull噪声中低信噪比时的检测概率和测角精度较高,额外目标的影响也减弱了。
    Its major functions include digital pulse compression, weighting in various forms, moving target indication, Doppler filtering, constant false-alarm rate detection, video integration, threshold detection, etc.
    它可以进行数字式脉冲压缩,多种形式的加权、动目标显示、多卜勒滤波、恒虚警检测、视频积累、门限检测等处理功能。
    The paper reviews and discusses pulse doppler signal processing circuits on board and fundamental concept and formulae of target detection probability and the probability of false alarm. Being known the threshold level and signal-to-noise ratio, the WATFIV (a modified version of FORTRAN 77) program for calculating the probability of detection is given. Another numerical example is also presented in terms of BASIC when the signal-to-noise ratio and probability of false-alarm are given.
    本文回顾和讨论了飞行器上脉冲多普勒信号处理电路、目标检測概率与虛警概率的基本概念和公式,给出了在确定门限电平和信/噪比时,求检测概率的FORTRAN程序,以及在确定信/噪比和虚警概率时的数值计算的两个实例,取得了与国外公布的数据相一致的结果。
    The operating SNR is dependent on the detection probability and false-alarm rate of system.
    系统工作信噪比与探测概率和虚警率相关。
    An algorithm of detecting targets is proposed and the probability of detection and the false-alarm probability of this altimeter are calculated according to the system simulation results,which shows this altimeter are calculated according to the system simulation results,which shows this altimeter can be used on all kinds of aeroplane to detect altitudes.
    提出了一种目标信号检测算法,根据系统模拟结果计算出该高度计的发现概率和虚警概率,说明这种高度计可以用于各种飞机的测高。
    Under the Swerling II assumption, the analytic expressions of false-alarm probability (Pfa), detection probability (Pd) and Average Decision Threshold (ADT) of this detector are derived, its detection performances in homogeneous background and in strong interfering targets environment are analyzed, and compared with that of OS-, GOSGO-CFARs.
    我们推导出了该检测器在Swerling Ⅱ型目标假设下的虚警概率(P_(fa))、检测概率(Pd)和度量平均判决门限(ADT)解析表达式。 分析了它在均匀背景和强干扰环境中的检测性能。
    The character of fusion entropy is discussed and the entropy concept of optimal decision in multi-sensor systems is then deduced. The influence of the method in the reliability and false-alarm probability of fusion systems is analyzed showing its significance in enhancing the quality of the fusion systems.
    推导了多传感器系统最优决策融合的熵规则.分析了该方法对融合系统的可靠性和虚警率的影响,表明该方法对提高融合系统品质具有重要意义
    A digital GPS PN code acquisition circuit based on direct IF sampling is presented Based on the mathematics model of this circuit, the relations between searching rate, probabilities of false-alarm, probabilities of detection and input carrier-to-noise density ratio(C/N 0) are analyzed A digital system scheme based on the acquisition circuit is proposed According to the result of the analysis the digital acquisition circuit can be adopted for improving acquiring performance and system reliability
    在对其进行数学建模的基础上 ,分析了该电路的虚警概率、检测概率、载噪比与捕获速率的关系 ,并提出了GPSC/A码捕获数字系统的实现方案。 数字化GPS接收机码捕获电路可以有效地提高捕获的成功率和抗干扰性能 ,也为提高接收机集成度 ,增加系统可靠性起到了重要作用
    Based on the spread-spectrum code acquisition scheme of P-SCDMA ( Packet-Switch-Synchronous Code Division Multiple Access) , the paper sets up a signal model and analyzes parameters of the acquisition system theoretically with the statistical result of partial-correlation of m sequence. Figures of false-alarm probability versus E_c/N_o and figures of detection-probability versus E_c/N_o on AWGN condition are presented.
    在包交换同步码分多址 (P- SCDMA:Packet- Switch- Synchronious Code Division Multpiple Access)系统的扩频序列的捕捉方案基础上 ,建立了信号模型并运用 m序列部分相关的统计结论从理论上对捕捉系统的参数进行了分析 ,给出了在 AWGN环境下虚警概率对 EC/N0 、检测概率对 EC/N0 的图像。
    The paper gives out mathematical modeling of the digital PRN code acquisition and tracking process,derives the expressions of the detection and false-alarm probabilities, presents the improved double_dwell search strategy ,analyzes the dynamic tracking performance and influence of input noise mathematically.
    从数字码跟踪环的角度研究了高动态体制下GPS接收机性能 ,对伪码捕获和跟踪过程建立了数学模型 ; 推导出伪码捕获的检测概率和虚警概率 ,提出改进的双Dwell搜索方法 ;
    From the simulation results of real infrared images, the algorithm can successfully detect dim moving point target with the signal-to-noise ratio equaling 2 and obtain its real-time position and velocity information accurately under the condition of constant false-alarm probability(CFAR). The algorithm useful in many practical applications is insensitive to the changes of noise's statistical distribution and adaptable to real-time image processing and target detection.
    仿真实验表明:在恒虚警概率条件下,该检测算法能高效地检测信噪比约为2的弱点状运动目标,检测性能对噪声分布不敏感,能精确地得到目标的即时位置和速度信息,适合于实时图像处理和目标探测,具有很高的实用价值。
 

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