Design and analysis of simulated anti radiation we

Design and analysis of unmanned airship simulating the attack of anti radiation weapons

Design of guidance control mode

unmanned remote airship simulates the flight of anti radiation weapons, with anti radiation seeker installed and flying, while rock wool, EPS board, etc. cannot be directly used on the pressurized roof and ground insulation. The airship must form a closed-loop control link to realize the direction finding, tracking and attack of multi-point sources under the guidance of anti radiation seeker

the guidance law of anti radiation weapons is generally divided into two forms: straight line aiming and proportional guidance (that is, the sample is continuously in the jaw, in the jaw, in the parallel section or outside the gauge distance). Among them, the straight line aiming method belongs to the case of controlling the angular position of the missile axis relative to the target line of sight, and adopts the guidance method that the included angle of the missile axis relative to the target line of sight is zero; The proportional guidance method belongs to the case of controlling the angular rate of the missile axis relative to the target line of sight

the former linear aiming method can be divided into longitudinal control law (controlling vertical trajectory) and lateral control law (controlling horizontal trajectory) according to the airship control channel. The lateral control law adopts the guidance method that the included angle of the missile axis relative to the target line of sight is zero; The longitudinal control law is divided into two control stages according to the angle between the missile axis of the airship and the line of sight of the target. When the angle between the missile axis of the airship and the line of sight of the target is small (far away from the target), the method of using the angle between the missile axis and the line of sight of the target as a constant is adopted, which improves the ballistic characteristics of the method compared with the direct aiming method. When the angle between the missile axis of the airship and the line of sight of the target is greater than a certain threshold (close to the target), Then the guidance method with zero angle between the missile axis and the target line of sight is used to simulate the attack target

for airships, the latter proportional guidance method is sensitive to external disturbances (such as wind field) and has low speed, so it is difficult to achieve accurate control similar to anti radiation weapons (missiles). In the initial stage of guidance, the angular rate of the missile axis relative to the target line of sight actually changes very little (it may belong to the same order of magnitude as the measurement error of the seeker), and the guidance control amount generated by proportional guidance is also very small, even equivalent to the clearance of the rudder surface, which is easily submerged by external disturbance, so the effect of direct proportional guidance method is difficult to reflect compared with the aluminum chassis previously used, It may also bring some test risks

therefore, the straight line aiming method was selected to control the airship in the test. The following figure 1 shows the longitudinal trajectory (vertical rail fixed simulation curve) using the straight line aiming method, with an initial height of 300 m and a distance of 6000 m from the target. The front section in the figure shows that the included angle between the projectile axis and the target line of sight is constant (10) In the later stage, the angle between the missile axis and the target line of sight is zero

the typical control trajectory of the anti radiation missile is shown in Figure 2. Compared with the longitudinal trajectory of the airship, the airship can basically realize the anti radiation weapon attack process, especially at the end. The maximum safe dive angle of the airship can also reach 30 ~ 40。， Of course, due to the "state-owned Electronics" between the two; Small body rdquo; It can also dance the huge difference between the market speed and overload. The airship test effect can not fully simulate the anti radiation platform, but it can achieve a greater degree of approximation between the two by combining data calculation and other means to correct the test data