rdlc barcode font FIGURE 1778 Plan position indicator (PPI) of southeastern Massachusetts in Software

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FIGURE 1778 Plan position indicator (PPI) of southeastern Massachusetts
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center of the oscilloscope screen radially outward In this way the direction and range position of an object can be determined from the pattern on the screen of the oscilloscope, as shown in Fig 1778 There are two methods by which the angular direction of the cathode spot is made to correspond with the angular position of the antenna In one method, used on board ship, two magnetic de ecting coils are rotated around the neck of the tube in synchronism with the antenna, by means of a selsyn In the other method, used on aircraft, two xed magnetic de ecting coils at right angles to each other and placed at the neck of the tube are supplied with current from a small two-phase synchronous generator whose rotor is driven by the antenna Thus a rotating eld, similar to that produced by the stator of an induction motor, is produced by the magnetic de ecting coils These two rotating elds, although produced by different means, are equivalent and cause the cathode beam to sweep radially in synchronism with the antenna Circular coordinates spaced radially corresponding to distance are obtained by impressing on the control electrode short positive pulses synchronized with the transmitted pulse but delayed by time values corresponding to the desired distances These coordinates appear as circles on the screen Since the time of rotation of the antenna is relatively slow, it is necessary that a persistent screen be used in order that the operator may view the entire pattern In Fig 1778 is shown a line drawing of a PPI presentation of Cape Cod, Mass, on a radar screen, taken from an airplane The applications of radar to war purposes are well known, such as detecting enemy ships and planes, aiming guns at them, and locating cities, rivers, mountains, and other landmarks in bombing operations In peacetime, radar is used to navigate ships in darkness and poor visibility by locating navigational aids such as buoys and lighthouses, as well as protruding ledges, islands, and other landmarks It can be similarly used in air navigation, as well as to operate altimeters for determining the height of the plane above ground It is also used for aerial mapping There are also radio beacons, shoran (short-range navigation) and loran (longrange navigation) by which ships or planes can locate their positions In the groundcontrolled approach (GCA) for airplanes, the ground operator picks up the plane on a PPI presentation at distances up to 30 mi, using a general surveillance radar, and gives instructions to the pilot by radio course and procedure As the plane approaches the landing eld, it is brought into vision on the screen of a highresolution short-range radar, and the pilot is given continual detailed instructions as to the glide path which the plane is to follow until the landing is made Television is accomplished by systematically scanning a scene or the image of a scene to be reproduced and transmitting at each instant a current or a voltage which is proportional to the light intensity of the elementary area of the scene which at the instant is being scanned The varying voltage or current is ampli ed, modulated on a carrier wave, and then transmitted as a radio wave At the receiver the radio wave enters the antenna, is ampli ed, and demodulated to give a voltage or a current wave similar to the original wave This voltage or current wave is then used to control the intensity of a cathode ray beam which is focused on a uorescent screen in a cathode ray reproducing tube The cathode ray beam is caused to move over the screen in the same pattern as the scanning beam at the transmitter and in synchronism with it Thus each small area of the receiver screen is illuminated instantaneously with light intensity corresponding to that of a similarly placed area in the original scene This process is conducted so rapidly that owing to persistence of vision of the eye, the reproduction of each instantaneous scene appears to be a complete picture and the effect with successive scenes is similar to that produced by the projection of successive frames of a motion picture
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