周期扫描磁信号特征对光磁复合方位 探测统计分布的影响

针对超近程来袭目标方位探测统计分布问题，研究了光磁复合方位测量方法周期扫描磁信号对探测精度的影响机理。建立了永磁体旋转扫描空间磁场数学模型，推导出周期扫描磁信号方程，结合磁信号特征和恒阈值时间测量方法，推导出周期扫描磁信号时间测量概率统计分布函数解析式。研究了扫描周期、磁场强度、阈值电压和噪声对时间测量概率统计分布的影响规律。结果表明，随着扫描周期和磁场强度的增加，概率分布函数对称性不受影响，概率分布半宽会随之减小，且分布峰值随之呈现0.75～1.88范围内的增加。随着阈值检测电压的提高，概率分布首先呈现半宽减小、峰值提升0.48态势，进而出现半宽增大、峰值降低0.54现象，且在峰值前后分布曲线的上升沿和下降沿出现不同走势。随着等效噪声电压的增加，概率分布函数对称性不受影响，但分布半宽会随之增大，且分布峰值随之减小0.4～0.48。

Influence of periodically scanning magnetic signal characteristics on the statistical distribution of laser-magnetic composite azimuth detection

Aiming at the statistical distribution of azimuth detection of ultra-short-range incoming targets, this article studies the influence mechanism of periodic scanning magnetic signal on the detection accuracy of the laser-magnetic composite azimuth measurement method. The mathematical model of the permanent magnet rotating scanning space magnetic field is formulated, and the periodic scanning magnetic signal equation is derived. Combined with the characteristics of the magnetic signal and the constant threshold time measurement method, the analytical formula of the probability and statistical distribution function of the time measurement of the periodic scanning magnetic signal is deduced. The effects of scanning period, magnetic field intensity, threshold voltage, and noise on the probability and statistical distribution of time measurement are studied. The results show that with the increase in scanning period and magnetic field intensity, the symmetry of the probability distribution function is not affected, the half-width of probability distribution decreases, and the peak value of distribution increases in the range of 0. 75~ 1. 88. With the increase of the threshold detection voltage, the probability distribution firstly shows a trend of decreasing half-width and the peak value is increased by 0. 48, then increasing halfwidth and the peak value decreased by 0. 54, and the rising and falling edges of the distribution curve before and after the peak have different trends. With the increase of equivalent noise voltage, the symmetry of the probability distribution function is not affected, but the distribution half-width increases and the distribution peak decreases in the range of 0. 4~ 0. 48.