Abstract:
The influence of tracking jitter on the far-field spot of turbulent atmospheric transmission is analyzed. Based on Maxwell's electromagnetic field theory, the Fried coherence diameter is used to describe the atmospheric turbulence, and the far-field expression of the transmitted beam due to optical axis deviation caused by tracking jitter is derived. The method of phase screen is used to simulate the tilt phase caused by tracking jitter and phase modulation caused by atmospheric refractive index fluctuation. Fast Fourier Transform Subharmonic Method is used to simulate the transmission process. The changes of miss distance of far-field spot under different tracking jitter and turbulence intensity and the echo probability of the simulated targets in different sizes are analyzed. The analysis results show that when the transmission distance is 10 km, the miss distance of far-field spot caused by strong turbulence can reach dozens of microradians. When the tracking jitter is large, the influence of turbulence on the miss distance is very small. Finally, for the simulation target of specific size, the control range of the transmission system tracking jitter is given.