Development Of Semi-active Laser Guided Weapons Simulation System Simulation Seeker

The semiactive laser guidance weapon simulation system plays an important role in the laser guidance weapons developing process, for it can save the massive developing funds and experimental time. It also plays an important role in application simulating and in training.A simulated semiactive laser guidance seeker was developed based on the PL-2 missile seeker in the paper. The simulated seeker has important application value which can be used to construct a semiactive laser guidance weapon simulation system.The gyroscope is the key device for stabilizing, scanning and tracking in the seeker. The work mechanism of the gyroscope in the seeker is illustrated detailedly through analyzing the PL-2 missile seeker's structure. The gyroscope electric circuit, including the gyroscope's driver circuit, the gyro shaft position detecting circuit and the gyroscope's precessional circuit, was designed according to the gyroscope's work mechanism. The gyroscope electric circuit was fully tested and worked well.The infrared photo detecting element in the PL-2 missile seeker was replaced with a four-quadrant photo detector and the related circuit was designed, therefor, the simulated seeker can work with the 650nm laser. A low noise photoelectric circuit was designed to detect the guiding laser pulse signal, and in order to enhance the system signal to noise ratio, a correlated synchronal detecting scheme was introduced. Some research work was done to identify the characteristic of four-quadrant photo detector. A new definition of the light responsivity uniformity among the four quadrant elements is described in the paper, and a simple effective method is introduced to measure the light response uniformity.A MCU was used to acquire the photo detector data and the gyroscope signal. The MCU circuit and the MCU program was designed. The MCU controls the gyroscope. Searching and stably tracking of the guiding laser facula was achieved.The new definition of the light responsivity uniformity among the photo detector's four quadrant elements and the related measure method described in the paper is innovative, which does helps to the application of four-quadrant photo detector. It's characteristic work to use the correlated synchronal detecting scheme to enhance the system signal to nosie ratio, and it's referential for the laser guidance weapons development.