Numerical Simulation Research of Advanced Multiple Aperture Seeing Profiler

The Advanced Multiple Aperture Seeing Profiler (A-MASP) consists of two small telescopes, and it could measure the daytime turbulence profile by observing the granulation of the solar surface. The advanced formula used to measure the turbulence profile could eliminate the relative pointing error between the two telescopes. The method of numerical simulation is used to study the detection performance of this instrument. The A-MASP is insensitive to turbulence near the earth's surface after the calculation formula of turbulence profile for eliminating jitter is used. When the distance of the two telescopes is 0.4meter, turbulence below 400meters could not be measured. In A-MASP, the sample height is not uniform, which will cause the distortion of the measurement result. Thus a method for calculating the equivalent sampling height is proposed, which could correct this distortion effectively. 100 layers of phase screens were used to simulate the atmospheric turbulence profile. The results show that when the distance of the telescopes is different, the results of turbulent profile measurements have their own focuses. When the distance is relatively close (0.4m), A-MASP has a high accuracy for measuring the turbulence profile from 0.4km to 5km. When the distance is 1.2meters and 2.0meters, the measurement of turbulence profile above 5km is more accurate. Turbulent profiles could be obtained at different heights by changing the distance of the telescopes.