Signals
In space and astronautical engineering, signals refer to any form of information transmitted through electromagnetic waves or other means, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Signals are used for communication between spacecraft and ground stations, navigation, remote sensing, and scientific research. The design and implementation of signal systems involve various disciplines, such as antenna theory, modulation and demodulation, coding and decoding, signal processing, and error correction. The propagation of signals in space is affected by many factors, such as atmospheric absorption, scattering, diffraction, refraction, and interference. Therefore, signal engineers need to consider the characteristics of the signal source, the transmission medium, and the receiver, as well as the environmental conditions and the mission requirements, in order to optimize the performance and reliability of the signal system.
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