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干扰空域评估实验需要用到激光目标指示模拟器、漫反射板假目标和干扰空域评估系统等设备,具体实验示意图如图4所示。
实验步骤如下:
(1)将3个漫反射板按照一定距离和方位摆放在干扰空域评估系统的0°,120°,240°三个方向上,由激光目标指示模拟器发射模拟“干扰激光”,照射在其中一个漫反射板假目标上。
(2)利用干扰空域评估系统设备上的观瞄望远镜来瞄准目标,通过调整云台方位旋钮和俯仰旋钮控制干扰空域评估系统设备对准目标,读出此时云台上码盘的方位角数据。
(3)通过评估系统设备对当前位置下的反射激光能量密度进行测量,通过对视频图像中靶板图像进行解算得到靶板距离和法向角方位分量、俯仰分量,再结合码盘方位角数据对漫反射板假目标的朝向进行精确修正。
(4)根据上一步所采集到的数据和干扰空域评估模型,对单个假目标干扰空域进行评估。
(5)重复以上步骤,对其他两块漫反射板假目标用不同功率的激光进行照射,对剩余假目标干扰空域进行评估。用不同功率干扰激光进行照射的目的是验证不同接收激光功率对假目标干扰空域大小的影响。在对整个布站区域的单个假目标测完之后,可以得到整个区域内所有假目标干扰空域的态势图。
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实验中首先对三个方向上的反射能量密度进行测量,每一个方向上经过测量计算得到20组能量密度数据,最后计算每个方向上的能量密度平均值,得到的测量计算结果如表1所示。
Number Energy value in the 0°/J·mm−2 Energy value in the 120°/J·mm−2 Energy value in the 240°/J·mm−2 1 2.79×10−13 2.24×10−13 4.20×10−13 2 2.77×10−13 2.23×10−13 4.15×10−13 3 2.75×10−13 2.22×10−13 4.15×10−13 4 2.75×10−13 2.20×10−13 4.14×10−13 5 2.72×10−13 2.20×10−13 4.14×10−13 6 2.72×10−13 2.19×10−13 4.11×10−13 7 2.72×10−13 2.18×10−13 4.11×10−13 8 2.71×10−13 2.18×10−13 4.10×10−13 9 2.71×10−13 2.18×10−13 4.08×10−13 10 2.71×10−13 2.18×10−13 4.08×10−13 11 2.71×10−13 2.17×10−13 4.07×10−13 12 2.69×10−13 2.16×10−13 4.07×10−13 13 2.68×10−13 2.15×10−13 4.06×10−13 14 2.68×10−13 2.15×10−13 4.06×10−13 15 2.67×10−13 2.15×10−13 4.06×10−13 16 2.66×10−13 2.14×10−13 4.04×10−13 17 2.65×10−13 2.14×10−13 4.04×10−13 18 2.65×10−13 2.12×10−13 4.04×10−13 19 2.64×10−13 2.12×10−13 4.02×10−13 20 2.64×10−13 2.10×10−13 4.02×10−13 Average 2.70×10−13 2.17×10−13 4.08×10−13 Table 1. Laser energy density measurement results
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分别对三个方向上的靶板进行图像采集和参数解算,得到靶板的距离L和法向角
$\varphi $ 等参数,图像采集及参数解算结果如图5和表2所示。Azimuth/(°) Distance of target board L/m Normal angle azimuth component ${\varphi _a}$/(°) Normal angle pitch component ${\varphi _p}$/(°) 0 143.072 0.4 18.4 120 142.643 0.4 19.4 240 143.072 0.2 19.0 Table 2. Result of target board parameter calculation
结果显示,系统能够正确识别靶板目标并对其参数进行解算。其中,0°方向上的靶板目标与测试系统设备距离为143.072 m,靶板的法向角方位分量为0.4°、俯仰分量为18.4°;120°方向上的靶板目标与测试系统设备距离为142.643 m,靶板的法向角方位分量为0.4°,俯仰分量为19.4°;240°方向上的靶板目标与测试系统设备距离为143.072 m,靶板的法向角方位分量为0.2°,俯仰分量为19.0°。由于三块靶板的法向角方位分量较小,为方便计算,靶板的法向角
$\varphi $ 近似取为${\varphi _p}$ 。 -
根据3.2.1及3.2.2节所测量和解算的数据,对三个方向的假目标进行干扰空域评估。假设气象条件为一般,能见度为15 km,导引头所接收的能量密度阈值为1.0×10−15 J/mm2,分别得到三个方向假目标的干扰空域态势图。态势图给出了20°、45°和70°威胁角下的干扰空域,如图6(a)~(c)所示。漫反射板实际的干扰空域应是一个近似半球空间,图6所绘制的干扰空域是三个威胁角平面下截取的干扰范围。在完成对三个单目标干扰空域评估后,通过空间合成可完成对三个目标联合布站干扰空域的评估,如图6(d)所示。
态势图结果显示,三个方向的靶板在45°威胁角下的干扰最大距离分别为2045.6 m、1860.4 m和2470.0 m,可见单个目标的干扰空域大小与系统接收能量有关,接收能量越强,干扰距离越大。由于文中实验使用的激光目标指示器功率较小,因此假目标的干扰空域较小,在实际应用中假目标干扰空域的范围会随干扰激光功率的增加而增大。三个靶板的法向角俯仰分量最大为19°,均不超过20°,比较同一个靶板在不同威胁角下的干扰空域可以看出,当威胁角与靶板法向角俯仰分量的角度差越大,即武器来袭方向与漫反射板的法线方向夹角越大时,靶板的干扰空域越小。因此,当武器来袭方向与靶板的法线方向相同时,靶板的干扰效果最好,干扰空域可以达到最大。多目标干扰空域合成可以实现对整个防区内的假目标干扰态势的评估。
Research on the technique of interference airspace evaluation of laser angle deception false targets
doi: 10.3788/IRLA20210008
- Received Date: 2021-01-04
- Rev Recd Date: 2021-03-19
- Publish Date: 2021-09-23
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Key words:
- angle deception interference /
- diffuse reflector /
- interference distance /
- interference airspace
Abstract: Aiming at the problems of lack of instantaneity and low visualization in laser angle deception interference evaluation, the evaluation system for the airspace interference of false targets of laser angle deception interference was constructed. Firstly, the distance and attitude parameters of the false target of the diffuse reflector were calculated according to the principle of perspective projection, and then the interference mechanism of the false target of the diffuse reflector was analyzed and based on the interference distance, the airspace evaluation model of the false target interference of the diffuse reflector was derived. Finally, experiments were designed relied on the system. In the experiment, the diffuse reflector installed in the direction of 0°, 120° and 240° of the equipment was irradiated by lasers with different powers. Then the evaluation system equipment was used to measure the parameters of the three diffuse reflectors, and the average energy density received by the system were 2.70×10−13 J/mm2, 2.17×10−13 J/mm2 and 4.08×10−13 J/mm2 respectively. The maximum interference distance under 45° threat angle were 2045.6 m, 1860.4 m and 2470.0 m, respectively. Finally, the relationship between the size of the jamming airspace and the threat angle of the weapon was analyzed, and the situation maps of the interference airspace of the false target under the threat angles of 20°, 45° and 70° were obtained. The experimental results show that, under the experimental conditions, the interference airspace range of the false target increases with the increase of the energy received by the system. The smaller the angle between the attack direction of the weapon and the normal direction of the diffuse reflector, the greater the interference airspace. Taking the interference distance as the evaluation index, the interference airspace of the diffuse reflector false target is evaluated, which can provide technical support for the interference effect evaluation of false target.