Design of Single Star Simulator Based on LED Light Source

This paper use a single LED light source with wide spectrum to develop a single star simulator of compact structure and high precision. In order to select the spectrum of LED as the light source of star simulators, the spectrum range of simulated star magnitude is researched through Main Star Sequence Diagram. It is found that the spectrum between 2m~7m magnitudes is basically in accordance with the spectrum range of white light. The PWM current control system with 16 bites controller is employed to adjust LED luminescence through changing the duty ratio of PWM, which ensures the error of drive current less than 0.1%. The experiments show that the LED star simulator has the characteristics of compact structure, economical and easily controlled. The simulated precision of star magnitude attains ±0.1m .