Chirp unequal error modulation method based on plasma sheath channel, aircraft

Abstract

The invention belongs to the technical field of communication, and discloses a Chirp unequal error modulation method based on a plasma sheath channel, and an aircraft. At the signal transmitting end of the system, three different sequences m(t), n(t) and c are generated. (t), used to modulate the slope adjustment rate of the Chirp signal, carrier frequency and phase respectively; Chirp signal composite modulation; Chirp signal passes through the plasma sheath channel; After the signal passes through the plasma sheath channel, the signal received at the receiving end is respectively Do the fractional Fourier transform of the best order corresponding to the positive and negative slope adjustment, and sample the data at the best focus positions corresponding to different carrier frequencies; demodulate according to the sampled information to obtain the sent message sequence . The invention ensures that important information is sent out preferentially when the spaceship passes through the "black barrier" area. At the same time, compared with the existing FSK transmission scheme, the demodulation complexity is reduced, and the bit error rate is reduced at the same time.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a Chirp unequal error modulation method based on a plasma sheath channel and an aircraft. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: When a hypersonic vehicle enters the atmosphere from outer space, due to the high-speed motion of the vehicle, it will cause severe friction with the air. This friction converts part of the kinetic energy of the vehicle into heat energy, causing the temperature of the surrounding air to rise sharply, thus making the surrounding air molecules Ionization is a large number of charged particles such as ions and electrons. In addition, the surface of the aircraft will also be burned because it is surrounded by high-temperature gas, resulting in complex chemical reactions, resulting in the production of a large number of chemical ions. The above two points lead to t...

AI Technical Summary

Problems solved by technology

[0003] In summary, the problems in the prior art are: The current research on the information transmission technology of high-speed aircraft near space basically follows the idea of ​​traditional satellite communication technology. Existing experiments have proved that the 2FSK communication system is a better transmission system, but its inherent transmission efficiency is low. Complicated disadvantages

[0004] The difficulty and significance of solving the above technical problems: The dynamics of the plasma sheath channel is a complex stochastic process, leading to its complex electromagnetic properties of random media

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