The wavelength of green laser pointer can be considered

Can be drawn from the above two logical operations: the location of the target of M (-1,1), is indeed in the A quadrant, consistent with previous assumptions. If the target is in the optical axis point, then: M (0,0). Since the target off-axis (which is also aimed at the axis) position of the flight of the missile body has been measured, then the error signal is formed to have a basis. Must also be pointed out that the precision of the seeker is generally always on the optical system and detector gyro platform, the use of the gyroscope's axis of precession, fast, stable track the target, as well as the homing missile information processor to provide the angular position, angular velocity and angular acceleration of the target flight. The wavelength of  green laser pointer  can be considered.
Target angle information provided by the information processor according to the logic circuit to provide the error voltage and gyroscope, an integrated manner, to find the guidance information in accordance with the guidance law. Therefore, the information processor has two tasks: First, to control the gyro, so that the optical axis of the detector at the center of the target; another is formed for the instruction provides guidance information. The instructions form a device in accordance with guidance information to create the guided instruction transported to the missile control system, and go to the control of the airframe of the corresponding control surfaces (such as steering gear), to correct the flight path of the missile body. Continuous control and correction until the projectile hits the target. Figure 2.4 shows developed by the United States and have been equipped combat troops "Hellfire" (translated as "Royal fire"), laser semi-active homing guidance missile seeker. Because a piece of battery cannot provide the enough power supply to  green laser pointer .
Figure 2.4 1 - co-touch switch 5 - Hood 9 - Universal bracket Hellfire missile seeker 3 - magnet 7 - laser detectors 11 - nutation damper - the primary mirror 8 - filters 12 - electronic module 2 - line package - release 10 - Lock Missiles with laser homing device, aerial bombs with laser seeker and guidance shells laser seeker is not the same, due to the operational characteristics and requirements, its searching the structure of the control system is also different, but the basic working principle is very similar, therefore, no longer go through. For example, some laser-guided weapons on the seeker does not set the gyro, but the seeker directly connected to the missile body, and the optical axis and the longitudinal axis of the missile body coincidence. The power of  green laser pointer is proper for the customer.
X and y of the error signal is directly added to the horizontal and vertical control wing of the airframe, you can make the missile body at the laser reflection point of the target to fly until it hits it. However, the gyroscope's tasks changed to take into account completed by the information processor on the bomb. Semi-active laser homing target indicator in Figure 2.2 the left side of the dotted line shown in the semi-active laser homing guidance target indicator, it is an important component of the laser homing systems, without it, the semi-active laser homing guidance on will be no rice 17 34 graduation project (thesis) paper straw ". Semi-active laser guided with laser target designator has two effects on the battlefield. The green green laser pointer will emit the green laser beam light.
First used as a major component of the fire control system, to indicate targets for laser guided weapons, to provide target data for the other weapons; heading for the aircraft equipped with laser tracking guidance. In the international arena, laser target designator has been a series of products, although the use of the laser wavelength is 1.06 microns, but the technical performance and family structure, but each is different, some of the output power, the role of distance; some system architecture complex, but the instructions accuracy; some can be mounted on the aircraft; suitable for use on the vehicle; some are portable type (such as three-legged posture, handheld);, according to operational need to choose. The rated power of  green laser pointer also means the peak power of the green laser pointer.