![]() ![]() The purpose of this twin-pulse technique is to increase the average power radiated and to reduce the possibility of false signal interference.ĥ After the receiver decodes an interrogation, the encoder generates the necessary pulse pair required for the transponder's reply. TACAN transponders use twin-pulse decoders to pass only those pulse pairs with the proper spacing. (1) fly directly to that particular location, or TACAN PULSE PAIRS. He frequency and identification code provide the or she can then either: geographic location of the transmitting beacon. The obtain bearing to and distance from that location. After the TACAN equipment installed in the aircraft and a 50- sec delay, the transponder responds with a TACAN ground equipment installed aboard a reply.Ĥ The airborne DME then converts the round- particular surface ship or shore station, a pilot can trip time to distance from the TACAN facility. By using surface TACAN system receives and decodes. The airborne equipment the direction of flight, in degrees-of-bearing, to the generates timed interrogation pulse pairs that the geographic location of the surface beacon. The other meter indicates Now look at figure 2-2. indicates, in nautical miles, the distance of the aircraft from the surface beacon. This information, as shown in figure 2- generate artificial replies instead of depending on 1, is usually provided by two meters.ģ One meter natural reflection. However, TACAN beacon-transponders information. The return signal (echo) of the radiated distance information, from distance measuring energy depends on the natural reflection of the radio equipment (DME), and bearing (azimuth) waves. equipment is an outgrowth of radar-ranging techniques.Ģ Radar-ranging determines distance by TACAN is a polar-coordinate type radio air- measuring the round-trip travel time of pulsed rf navigation system that provides an aircrew with energy. usually used for plotting antenna directional patterns. ![]() In electronics, it is The distance measuring concept used in TACAN. The polar-coordinate system is a geometric system used to locate points on a plane. Before we begin discussing TACAN, you need to recall the definition of the polar-coordinate system. INTRODUCTION (2) use the bearing and distance from a specific beacon to fix his or her geographic location. ![]()
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