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Navigation Computers
Radar pulse detection

Airman - Aviation theories and other practices
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The aircraft gyros, accelerometers, synchros, servos, and computers continually monitor aircraft heading, attitude, and horizontal and vertical velocities. Any change in the aircraft's latitude, longitude, or altitude involves a change in its speed or direction of motion. The inertia of extremely sensitive accelerometers resists these changes. This resistance is measured and recorded by the synchros, servos, and computers. The computers continually recalculate the movement of the aircraft based on the latest changes recorded by the accelerometers. The computers use these calculations to provide a constantly updated readout of the aircraft's geographical position. When used with Doppler radar, an INS greatly improves overall system accuracy. Q7-16. Define the radio communication method known as “radiotelegraphy.” Q7-17. Define the radio communication method known as “radiotelephony.” Q7-18. Airborne long-range communications sets normally operate in a band of what frequency range? Q7-19. Airborne short-range communications sets operate in what frequency range? Q7-20. What is the primary navigational aid used by the Navy for carrier-based aircraft? Q7-21. The Global Positioning System (GPS) is a space-based radio position and navigation system designed to provide what type of information? Q7-22. The GPS Satellite Vehicle consists of how many operational satellites? Q7-23. Doppler radar uses what type of transmission to measure the ground speed and drift angle of the aircraft? RADAR LEARNING OBJECTIVE: Recognize the operating principles, types, and uses of radar. The acronym  radar  means RAdio Detection And Ranging. Radar is a radio device used to detect objects at distances much greater than is visually possible. Detectable objects include aircraft, ships, land areas, clouds, and storms. In addition to detecting these objects, the radar shows their range and relative position. Radar was shrouded in secrecy all through World War II. It was one of our most important offensive and defensive weapons systems. Today, radar is used in most types of aircraft, and plays a major role in the mission of naval aviation. Modern developments have led to many specialized types of radar; however, the basic principle upon which it functions is simply echo waves. ECHO PRINCIPLES Radar works on the echo principle, as shown in figure 7-21. If a person shouts toward a cliff, in a few seconds the voice returns as an echo. If a radio wave is sent towards a cliff from a radio transmitter through an antenna, it would echo and return to be picked up through the antenna and sent to the radio receiver. Sound waves travel about 1,100 feet per second, while radio waves travel at the speed of light (about 7-16 TRANSMITTER-RECEIVER ANF0721 Figure 7-21.—Reflection of sound and radio waves.







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