Issue 2 (April)

This paper proposes an accurate positioning method for rocket debris based on genetic algorithm. The rocket debris will produce supersonic sonic boom in the process of falling, this paper realises the high precision positioning of the sonic boom position and time of the rocket debris by arranging multiple vibration wave monitoring devices in the debris theoretical fallout area, constructing a set of multilateral measurement equations by using the difference in the arrival time of the sonic boom, and introducing genetic algorithms to optimally solve the hyperbolic equations to achieve high precision positioning of the sonic boom position and time of the rocket debris. The results show that the genetic algorithm can effectively avoid the local optimum problem of the traditional method and significantly improve the positioning accuracy. In addition, this paper also explores the error analysis model and the optimisation method of monitoring equipment arrangement, which further improves the reliability and adaptability of the positioning system.

Aiming at the problem of accuracy degradation of laser velocimetry signals in high-speed flight scenarios due to complex noise interference, this study constructs a frequency estimation method based on the noise feature analysis of Butterworth filter and multi-domain spectrum fusion. Through the quantitative analysis of noise mean, variance and power spectral density, combined with the joint spectral analysis of Fourier Transform (FT) and Discrete Fourier Transform (DFT), the high-precision frequency estimation of noise-containing signals is achieved in MATLAB simulation environment, and the estimated frequency is 40999836.00Hz, with the relative error less than 0.01%. The proposed algorithm improves the signal-to-noise ratio by more than 35% while maintaining the signal integrity, which provides a reliable theoretical and methodological support for the noise suppression and parameter measurement of the laser speed measurement system under the high dynamic flight environment.