Parameter Estimation of the Projectile In-Bore Based on Time-Frequency Analysis

Abstract

Combined time-frequency peak filtering with wavelet modulus maxima, the millimeter wave interferometer echo signal process is presented, extracting the instantaneous frequency(IF) of the projectile in-bore. Based on that, the projectile’s velocity and acceleration curves are estimated and the length of the cannon is also calculated that’s consistent with the actual, which provides a strong basis for designing and improving weapons. And this approach ,with some commonality, can also be used to extract the IF of other signals.

Identifying pitching mode of aerial planting projectile by the use of image processing

“…Aerodynamic forces and moment are expressed in equations (5) to (15). Dynamic pressure has also been shown in equation 16D…”

“…According to equations (10) to (15) and the aforementioned assumptions, the equations that will be used for simulation are only lift, drag, and pitching moment equations (10), (12), and (14). Simulation results of equations (23) to (25) are plotted in Figures 7 and 8.…”

“…Projectile's velocity and acceleration curves were also estimated by combining time–frequency peak filtering with wavelet modulus maxima and millimeter wave interferometer echo signal process in Wang et al. 15…”

“…Algorithm used in this article achieves optimal estimation of the parameters by matching the stereo projection of the projectile and that of the same size of 3D model. Projectile's velocity and acceleration curves were also estimated by combining time-frequency peak filtering with wavelet modulus maxima and millimeter wave interferometer echo signal process in Wang et al 15 In the upcoming section, the required data is created to simulate the motion of projectile containing plant by using nonlinear flight equations. Longitudinal dynamic coefficients are obtained from tests in a wind tunnel in a later section.…”