机载预警雷达牵引模式的IRST探测效能分析

An Analysis of Detective Efficiency of IRST Sensor Based on the Pattern Towed by Airborne Early Warning Radar

机载预警雷达牵引红外搜索跟踪系统(IRST)探测是同平台多传感器协同的一种重要工作模式。为定量评估该模式对IRST探测效能的影响,以IRST探测概率作为评估指标,建立多个瞬时视场下的成功牵引概率数学模型,计算在不同雷达工作模式下满足一定成功牵引概率的IRST搜索视场范围,推导IRST的探测概率与作用距离、脉冲积累之间的关系式。仿真结果表明,在保证成功牵引概率为0.99的前提下,雷达在高精度测量模式下的牵引效果最佳,使IRST的搜索区域缩小为原来的1/180,时间节约效率为99.4%,加快了对目标的截获过程。节余的时间可用来对目标进行脉冲积累,当积累2个脉冲时,在其最大作用距离处所对应的探测概率由无积累时的0.5提升到0.985 3,从而显著提升其探测效能。

Abstract：Airborne early warning radar towing infrared search and tracking system for detection is a kind of important working mode of multi-sensors coordination on the same platform. In order to try to find out a- bout the quantitatively evaluative patterns influence on the IRST＇s detective efficiency, taking the detecting probability of the IRST as an evaluation criteria, this paper establishes a mathematic model of the success- ful towing probability under condition of multi-instantaneous field of views, calculates the view zones searched to meet the needs of a certain successful towing probability under condition of the different radar working modes, and then derives the relationship formulas among the detection probabilities, the operat- ing distances, and the pulse accumulations. Under the premise of ensuring that the successful towing prob- ability is 0.99, the radar in high precision measurement mode can acquire the best towing effect to make the search area of IRST reduce to 1/180 of the original, the time saving efficiency is 99.4~, and the process of target capture accelerates. The saved time can use to accumulate pulses, the detective probabili- ty corresponding to the maximum action distance increases from 0.5 to 0.985 3 when the accumulated num- ber of pulses reaches two pulses, thus significantly improving the detective efficiency of IRST.