Research On The Method Of Infrared Tracking And Localization For The Near Space High-speed Target And The Design Of Interceptor Firing Data

As with the flight tests, the near space hypersonic technology continues to mature. Among them, the scramjet-powered wave-rider air-breathing hypersonic vehicle is one of the main directions of development, but also the focus of this study. This paper conducted in-depth analysis on the dynamics model of near space high-speed target. On the basis of the model, the infrared detection, tracking target and interceptor Firing Data design methods are studied.1. The target dynamics model of this paper is based on long-range rocket dynamics model, focusing on aerodynamics and engine thrust. On the basis of the mechanism model, fitting formulas of aerodynamics are given and the thrust coefficients of the engine are solved, establishing a dynamic model of the target. Based on this model, the rolling maneuver is studied, noting that the lateral range of such maneuvering manner can be the quarter of distance. After that, the particle swarm algorithm is used to optimize the angle of attack sequence variables with range as the index, and so the tracks of the target altitude cruise segment are optimized.2. This paper focuses on the properties of near space exploration platform dealing with such goals, compared to conventional detection platforms, showing a great advantage. Establishing target radiation model to analyze the radiation characteristics of the target, 0.5-3 microns is noted as suitable detection window. Atmospheric transmittance is calculated based on atmospheric transmission software to analyze the infrared detection signal to noise ratio, simulations show that infrared detection meets the requirements of 1100 km of detection range. Then using the least-squares infrared positioning, this paper analyses the accuracy of bistatic location and three stations positioning, and contrasts the results with the analytic form of error propagation. A layout program of detection platform is designed.3.On the basis of infrared positioning data, we use interactive multiple model(IMM) algorithm tracking the target, and simulation results show that the algorithm is more accurate estimating target acceleration. Based on this, the nonconservative force acceleration fitting formula of target is given, and the fitting factors are solved to obtain the target fitting dynamics model and tracking model. Unscented Kalman filter(UKF) is used as a single model tracking algorithm for target tracking, showing a better result.4. According to the sensitivity analysis of interceptor firing data and interception range requirements, the border firing table and the state firing table are prepared for determining the initial value of firing data. Based on the target fitting dynamics, the trajectory of targets is predicted. Finally, according to the forecast tracks, a process of search for a predicted interception point and firing data design is given.