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Project Profile at a Glance A Satellite broadcasts a few watts of microwave signals from the geostationary orbit 36,000 kilometers above the earth. The transmissions are also broadcast over a wide "foodprint" area. The satellite signals suffer an attenuation of approximately 200dB, while making this 36,000 kilometers journey from the satellite to reception points on the ground. The satellite signals which finally arrive are extremely weak. A dish antenna is used to collect these weak satellite signals over a large area - the surface of the dish. These signals are then focused by the parabolic curvature of the dish, to the focal point. Even at the focal point, the satellite signals are only a few micro-watts. These tiny satellite signals are received and processed by sophisticated electronic equipment. Given the low signal strength, the signals need to be immediately amplified. However, it is very important that the amplification does not contribute any significant amount of noise which would otherwise spoil the weak signals received. This is done by a "Low Noise Amplifier". The atmosphere provides a low loss signal path for certain microwave frequencies. Satellite broadcasters therefore use this fact and provide satellite broadcasts at these frequencies. The earliest broadcast were at relatively low microwave frequencies. The amount of signal that a dish receives is directly linked to the frequency. For the same size of dish, the signals received will be larger for higher frequencies that lower frequencies. Technically, this implies that the same dish has as larger "Gain" at higher frequencies. Similarly, a smaller dish could be used at higher frequencies and yet provide the same signal gain. Recognizing this, international broadcasters now utilize Ku and even Ka band frequencies for commercial television Satellite based PNT service is emerging as an important space application area not only for civil aviation but in many other areas such as mobile telephones, surface transport, intelligent highway system, maritime transport, rail, oil and gas, precision agriculture, fisheries, survey and marine engineering, science, electricity networks and leisure
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