Ultra-long wave communication is that use electromagnetic wavelength at 10-100km to communication. It has a stable Ultra-long wave propagation chara -cteristics when use it to communication:The spread of small attenuation, can achieve long-distance transmission, good anti-interference ability, as well as good skin depth in sea water. It widely used in underwater discount wedding dresses communications and navigation. It’s communication system include various forms, such as Under water navigation system, Land-Sea, Car-Sea, Aircraft-Sea and Satellite-Sea Ultra-long wave communication.Ultra-long wave is a very special band in the electromagnetic wave , There is a big lace wedding dresses difference in it’s propagation characteristics compared to other high-frequency band .Study to the feature of ultra-long wave transmission is very important significance in our country’s marine development and national security.Paper contents and innovation include the following aspects:Firstly,We will Study to the Ultra-long wave’s mode of transmission. they are Ground wave transmission, air cheap evening dresses wave transmission and Waveguide transmission. Study to the features of Ultra-long wave transmission in the under water. And finally, Based on these features of Ultra-long wave transmission and a amount of observation data to build a Ultra-long wave transmission mathematical model.Secondly, We will study to the effects of cheap evening dresses wave communication system receiver’s cheap wedding gown dresses performance---Lightning atmospheric noise. First of all, we are analyze the formation of lightning atmospheric custom made prom dresses noise, and then use a large amount of observational datas and mathematical formula for the number of atmospheric noise. finally, we will to build a lightning atmospheric noise’s mathematical model and simulate it.Finally,we will Study and analyze the signal modulation and cheap evening dresses signal coding forms of Ultra-long custom made prom dresses communication systems . signal modulation include FSK and MSK. Study to anti-interference performance of Ultra-long wave communication systems.
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