Chirp non-equal error modulation method based on plasma sheath channel, and aircraft

Abstract

The invention belongs to the communication technology field and discloses a Chirp non-equal error modulation method based on a plasma sheath channel, and an aircraft. At a signal emission end of a system, three different sequences m(t), n(t) and c(t) are generated and are respectively utilized to modulate the slope rate, the carrier frequency and the phase of a Chirp signal; composite modulation of the Chirp signal is carried out; the Chirp signal passes through the plasma sheath channel; after the signal passes through the plasma sheath channel, a received signal is subjected to fractional order Fourier transform of the optimal order corresponding to positive and negative slope rates at a receiving end, and data is sampled at the best focusing position corresponding to different carrier frequencies; demodulation is carried out based on the sampled information to obtain a transmitted message sequence. The method is advantaged in that that important information is transmitted with priority is guaranteed when a spacecraft passes through the blackout area, moreover, compared with an existing FSK transmission scheme, demodulation complexity is reduced, and the bit error rate is furtherreduced.

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...

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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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