Dynamic plasma sheath phase shift keying signal decision detection method

Abstract

The invention relates to a dynamic plasma sheath phase shift keying signal decision detection method. A special law of an electromagnetic wave propagating in the plasma is used, a channel feature is predicted through measurement on a reflected wave, and a training sample is built. A signal acquisition device acquires an m-dimensional phase shift keying signal after plasma sheath, the m-dimensional phase shift keying signal is transmitted to a processing unit for decision detection processing, and a decision detection processing result is outputted. According to the dynamic plasma sheath phase shift keying signal decision detection method provided by the above technical scheme, the constellation point overlapping problem caused by dynamic plasma sheath spurious modulation effects can be effectively solved.

Description

technical field [0001] The invention relates to the field of near-space measurement and control communication, in particular to a dynamic plasma sheath phase-shift keying signal judgment and detection method. Background technique [0002] During the flight of a re-entry vehicle or a high-speed vehicle in near space, the body and the air will have severe friction, which will generate a plasma sheath, resulting in deterioration of communication quality, and in severe cases, interruption of information links, forming the so-called "black barrier" phenomenon. [0003] In recent years, it is generally believed that the main measures that are promising to solve this problem are: 1. Improving communication frequency and power, 2. Pneumatic forming, 3. Quenching of electrophilic substances, 4. Weakening of electromagnetic windows. To sum up, for the blackout problem caused by the plasma sheath, the current mainstream solution is to increase the communication frequency or reduce the ...

AI Technical Summary

Problems solved by technology

However, since the plasma sheath is dynamically time-varying, the dynamic characteristics of the plasma sheath can cause parasitic modulation effects

[0005] Measure 2 reduces the concentration of the plasma sheath through an intervention mechanism, but the implementation method is very complicated and will also be affected by the parasitic modulation effect

[0006] Increasing the carrier frequency and reducing the concentration of the plasma sheath through the intervention mechanism can help to weaken the modulation effect, reduce the overlap of constellation points, and reduce the bit error rate, but cannot completely eliminate the parasitic modulation effect

That is to say, it is impossible to completely offset the influence of the dynamic plasma sheath and realize the effective transmission of information

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