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FSK441, introduced in 2001 as the first communications mode included with WSJT, [3] is designed to support meteor scatter communication using radio-reflecting meteor trails. [2] The bursts of signal created by such trails are commonly referred to as "pings", due to their characteristic sound.
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Tropospheric scatter, also known as troposcatter, is a method of communicating with microwave radio signals over considerable distances – often up to 500 kilometres (310 mi) and further depending on frequency of operation, equipment type, terrain, and climate factors.
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Radar scatterometer. A radar scatterometer operates by transmitting a pulse of microwave energy towards the Earth's surface and measuring the reflected energy. A separate measurement of the noise-only power is made and subtracted from the signal+noise measurement to determine the backscatter signal power.
All graphical elements can be specified in a textual source file that can be compiled into a binary file or one of two text representations. CGM provides a means of graphics data interchange for computer representation of 2D graphical information independent from any particular application, system, platform, or device.