It reacts to information sent to it by the Autopilot see above. Control Surfaces. These are four "fins" that act against air resistance to change the direction of the missile. In summary, a guided missile is a combination of electrical, digital and mechanical parts segregated into sections. Each section has specific functions that must operate accurately and safely; otherwise, the missile mission is electronically aborted and the missile is destroyed.
Internal controls monitor each function to assure proper coordination among parts. This information is radioed to the launch controller, so that it knows at all times how well each part of the missile is performing to achieve the missile's ultimate goal of destroying the target. After a missile is manufactured, it must be transported to its launch platform. This can be an airplane , helicopter, truck , jeep, soldier, or ship from which it is carried, launched and controlled. In a ship, for example, an encanistered ship missile is moved by trucks and cranes.
Here is a Patriot canister. Some missiles are not encanistered; they are just placed unenclosed on their launching platform as these examples show: shoulder , plane , helicopter , plane , plane , jeep. Not everything is automatic; people are involved too!
The missile launching and target destruction process can be divided into seven stages: long-range and short-range surveillance, target identification, target tracking, missile pre-launch, launch, midcourse guidance, homing, and intercept. Each of these phases is described below:.
A systematic search by the launcher ship, plane, or ground station radars and more radars for targets in the hemisphere surrounding it. Another target tracking diagram that starts from search at the lower right and ends with intercept at the upper left. Note: "Illumination" means that the missile's own internal radar tracks the target. Not all missiles have their own tracking radar. Identification: "Friend or foe?
Radar Homing Guidance for Tactical Missiles
All commercial and military airplanes and some weapons and personnel have "transponders", which are receiver- transmitters that receive radio signals on one frequency and return a specific identification ID signal on another frequency. When the target code matches a "friendly" code in the launcher electronic library, no launcher action is taken.
However, if the ID matches a "foe" code, or if there is no response, the missile launcher assumes a "foe" and prepares to destroy the target. Tragedies can occur when a friendly transponder is inoperable. The Weapons Officer in charge of missile launch in airplanes, this would be the pilot selects a particular missile to attack the target with a push of a button.
The selected missile then automatically tests "checks" hundreds of its subsystems within milliseconds to assure their satisfactory operation. Also, the communications link from the launcher to the missile and the missile to the launcher are automatically tested for satisfactory functioning. If a subsystem or communications link fails after a few attempts, the missile declares itself inoperable a "dud" and the Weapons Officer selects another missile.
On a ship, the missiles are stored in launch boxes below deck.see url
The Development of Radar Homing Missiles_图文_百度文库
This image shows the white launch canister covers behind the gun on the front deck and behind the superstructure on the rear deck of the ship. Note: Once the missile is placed on its launch vehicle and electrically connected to its control center, it is ready to be fired by the Weapons Officer. In an airplane, the Weapons Officer is the pilot. This is true for encanistered and non-canistered missiles. There is no missile storage from which the missiles have to be physically moved to the ready position.
They are always ready to launch from their initial position and need merely be activated by the Weapons Officer. The launcher "tracking" radar continuously monitors the target, while computers continuously calculate target location, direction and speed. Human judgment is involved in identification too.
An Army radar control console located inside a truck.
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This information is transmitted from the ship or plane, or truck to the missile via radar, which adjusts its course to intercept the target. Missile functioning is continuously transmitted to the launcher via radio. When the missile approaches target vicinity, it activates its own radar and searches for the target itself, so that launcher radar no longer is required.
The image below is what a target missile one attacking you looks like to the attacking missile one you use to counterattack the attacker :.
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Note: Not all missiles have their own tracking radar. If not, then the controller at the launching ship, plane or truck must provide continuous tracking of the missile to its target. Intercept target destruction. The missile IR Infra-Red "seeker" determines when the target is at the optimum distance for maximum explosive effect, whereupon it sends a signal to the warhead to detonate. The explosive scatters serrated iron fragments or other destroying material in all directions.
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Some of these fragments are expected to impair target functioning. When that occurs, the target is a "kill". However, missiles don't always destroy the target. It enables you to teach more effectively, understand student misconceptions, structure class discussion, and save time. It is based on extensive patent-pending behavioral research at Harvard University and is used by a growing number of faculty and students at different universities. To get started, register as an instructor to set up your course and adopt this or another title, try out a live demo , or contact us for more information about adopting Perusall in your course.
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