CN106911397B - Method suitable for black-obstacle-area X-ray communication in reentry process of aircraft - Google Patents
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Abstract
The invention discloses a method suitable for X-ray communication in a blackout area in the reentry process of an aircraft, which mainly comprises the following steps: the communication data to be transmitted are generated by modulating an X-ray generator in an aircraft cabin, and different X-ray energies are selected to perform a reliable data transmission process according to different height positions of the aircraft when the aircraft enters a plasma sheath formed by atmosphere again. The invention fully utilizes the advantages of X-ray communication, and utilizes controllable X-rays with different energies to perform reliable communication process of uplink data according to the real-time height of the aircraft in the reentry process, thereby effectively solving the problem of communication in blackout areas.
Description
The technical field is as follows:
the invention relates to the technical field of communication, in particular to a method suitable for black barrier area X-ray communication in an aircraft reentry process.
Background art:
during the flight of a spacecraft at a speed of 5-20 times of the sound speed in an interval of 25-90km from the ground, a very violent shock wave is formed on the surface of the spacecraft through violent interaction between the air and the surface of the spacecraft, partial kinetic energy of the spacecraft is absorbed by surrounding air to cause dissociation of gas molecules, a high-temperature gas layer containing a large number of electrons and positive ions, namely a so-called plasma sheath, is generated, and the charged particles (mainly free electrons) can absorb, reflect and scatter electromagnetic waves to generate an effect similar to metal shielding, so that communication signals are attenuated, and the impedance characteristic of an antenna is changed and a directional diagram is distorted. These effects will lead to a deterioration of the communication quality and, when the plasma oscillation frequency is higher than the communication signal frequency, will lead to an interruption of the information link, forming a so-called "black-out" phenomenon.
The concept of space X-ray communication is firstly proposed by Keith Gendreau doctor of the United states national aerospace administration (NASA) Godard space flight center in 2007, X-rays are used as electromagnetic waves with short wavelength (0.01-10 nm) and high frequency (3 × 1016 Hz-3 × 1019Hz) and can also be used as carriers for carrying information for communication, the X-rays are transmitted in a vacuum environment without physical attenuation, the frequency is higher than the microwave by several orders of magnitude, theoretically, the bandwidth of a communication system is higher, Porter George professor of the university of California of America considers that the maximum theoretical speed of the X-ray communication can reach 40000Tbit/s, the reliability of a traditional radio frequency mode is greatly reduced and even the communication cannot be carried out under the conditions of shielding interference and space weather change, and the X-ray communication can normally work under the electromagnetic shielding environment and can be used for ultrahigh-speed airplane communication and aircraft communication in black areas.
Because the influence of the thin atmosphere on the X-ray still exists in the process that the aircraft reenters the atmosphere, the invention provides the method for carrying out uplink data communication transmission by utilizing the time-varying X-ray energy, thereby realizing the credibility of the X-ray communicated in the blackout area.
The invention content is as follows:
the invention provides a method suitable for X-ray communication in a blackout area in an aircraft reentry process, which aims at the problem of communication blackout in the prior art, and uses different X-ray energy selection methods at different heights in the aircraft reentry process in the process of uplink communication by utilizing X-rays so as to reliably transmit signals.
The invention adopts the following technical scheme: a method for blackout area X-ray communication during reentry of an aircraft, comprising the steps of:
step 1, carrying out analog-to-digital conversion on voice and video information to be transmitted into digital signals serving as modulation signals, and waiting for modulation of carrier signals;
and 3, selecting different X-ray energies in real time for uplink transmission according to different position heights of a plasma sheath formed when the aircraft reenters the atmosphere and aiming at the modulated signals obtained in the step 2.
Further, step 1 specifically includes the following steps:
step 1.1, as a common signal modulation method for X-ray communication, binary amplitude shift keying and multi-pulse position modulation are available;
step 1.2, a binary phase shift keying modulation method is selected, which utilizes two phases to transmit binary symbols, the common phases are 0 and pi, and T is carried out in the nth time slot (n-1)b≤t＜nTbThe signal can be expressed as
The baseband signal m (t), after modulation of the carrier signal, is sBPSK(t)＝Am(t)cos2πfcT, where A is the carrier signal amplitude, TbIs the carrier period, fcIs the center frequency of the carrier signal;
step 1.3, corresponding to this, such methods that rely on accurate carrier frequency or phase information for reception are coherent reception or coherent demodulation.
Further, the step 2 specifically comprises the following steps:
step 2.1, aiming at the modulation signal obtained in the step 1, an X-ray generator in the aircraft cabin modulates and generates uplink communication data to be transmitted;
and 2.2, aiming at the signals emitted by the X-ray generator in the aircraft cabin, effectively focusing and collimating the X-rays to improve the effective transmission of the signals.
Further, step 3 specifically includes the following steps:
step 3.1, according to different position heights of the aircraft re-entering the atmosphere, aiming at the modulated signals obtained in the step 2, selecting different X-ray energies to carry out uplink transmission;
3.2, when the mobile terminal just enters a position with the height of 90km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 10 keV; when entering a position with the height of 80km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 15 keV; when entering a position with the height of 70km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 18 keV;
3.3, when the mobile terminal enters a position with the height of 61km in a black barrier area, performing uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 20 keV; when entering a position with a black barrier area height of 50km, carrying out uplink communication in a thin atmosphere by using X rays with a voltage of more than or equal to 50 keV; when entering a position with the height of 40km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 150 keV;
3.4, when the user leaves the position with the height of 30km of the black barrier area, performing uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 200 keV;
and 3.5, taking the height as a reference, and selecting proper X-ray energy according to the corresponding height to reliably transmit uplink data in the process that the aircraft enters the atmosphere again.
The invention has the following beneficial effects: the invention fully utilizes X-rays to solve the problem of forming blackspot communication in the process of reentry of an aircraft into the atmosphere, and provides the problem of reliable uplink data communication by utilizing variable X-ray energy at different flight altitudes by considering that a rarefied atmospheric environment still exists in the reentry process.
Description of the drawings:
fig. 1 is a schematic diagram of uplink communication in a black-mask area by using X-rays.
FIG. 2 shows uplink communications in a thin atmosphere using X-rays of 10keV or more at a location 90km from the height of the blackout zone.
FIG. 3 illustrates uplink communications in a thin atmosphere using X-rays of 20keV or more at a location 61km from a blackout zone height.
FIG. 4 illustrates uplink communications in a thin atmosphere using X-rays of 200keV or more at a location 30km from the height of the blackout zone.
Fig. 5 is a graph of error characteristics in a plasma channel using X-ray communication.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the problem of communication black-out during the reentry of an aircraft, which can use X-rays for effective uplink transmission, includes the following steps:
step 1, performing analog-to-digital conversion on information such as voice, video and the like to be transmitted into digital signals serving as modulation signals, and waiting for modulation of carrier signals (adopting BPSK modulation);
and 3, selecting different X-ray energies in real time for uplink transmission according to different position heights of a plasma sheath formed when the aircraft reenters the atmosphere and aiming at the modulated signal obtained in the step 2 by referring to the figure 2, the figure 3 and the figure 4. For the signals emitted by the X-ray generator to re-enter the aircraft cabin, effective focusing and collimation of the X-rays is required to improve the effective transmission of the signals. According to the invention, different X-ray energies are required to be utilized for uplink communication, the plasma sheath layer formed in the reentry process of the aircraft is considered, the influence of a weak atmospheric layer still exists, and in order to effectively transmit X-ray communication data, different X-ray energies are selected for uplink transmission according to different position heights (25-90km) of the reentry of the aircraft into the atmosphere according to the modulated signals obtained in the step 2.
It should be noted that step 1 specifically includes the following steps:
step 1.1, as a common signal modulation method for X-ray communication (XCOM), there are binary amplitude shift keying (2ASK) and multi-pulse position modulation (MPPM);
step 1.2, compared with the signal modulation and demodulation methods, the Binary Phase Shift Keying (BPSK) modulation method is selected, the bit error rate characteristic has obvious advantages, the method utilizes two phases to transmit binary symbols, the common phases are 0 and pi, and T is carried out in the nth time slot (n-1)b≤t＜nTbThe signal can be expressed as
Baseband letterNumber m (t), s after modulation of the carrier signalBPSK(t)＝Am(t)cos2πfcT (where A is the carrier signal amplitude, T)bIs the carrier period, fcIs the center frequency of the carrier signal);
step 1.3, corresponding to this, such methods that rely on accurate carrier frequency or phase information for reception are coherent reception or coherent demodulation.
It should be noted that step 2 specifically includes the following steps:
step 2.1, aiming at the modulation signal obtained in the step 1, an X-ray generator in an aircraft cabin modulates and generates uplink communication data to be transmitted;
and 2.2, aiming at the signals emitted by the X-ray generator in the aircraft cabin, effective focusing and collimation on the X-rays are required to improve effective transmission of the signals.
It should be noted that step 3 specifically includes the following steps:
step 3.1, due to the short X-ray wavelength, the atmospheric pressure is below 10keV when the X-ray photon energy exceeds 10keV, i.e. if the wavelength is less than 0.12nm-4Pa, almost non-attenuated transmission of X-rays;
step 3.2, considering that a plasma sheath layer formed in the reentry process of the aircraft still has weak atmospheric influence, and in order to perform effective X-ray communication data transmission, different X-ray energies are selected for uplink transmission according to different position heights (25-90km) of the reentry of the aircraft into the atmosphere according to the modulated signals obtained in the step 2;
and 3.3, when the mobile phone enters a position with the height of 90km in a black barrier area, transmitting the mobile phone to an International Space Station (ISS) in a thin atmosphere by using X rays with the voltage of more than or equal to 10keV, wherein the transmission coefficient of the mobile phone exceeds 95 percent, and the energy is improved to be almost completely penetrated by 20keV or 50 keV. Therefore, the X-ray with 10keV can be selected for effective signal transmission, and when the X-ray enters a position with the height of 80km in a black barrier region, the X-ray with more than or equal to 15keV is required to be used for uplink communication in a thin atmosphere; when entering a position with the height of 70km in a black barrier area, uplink communication needs to be carried out in a thin atmosphere by using X rays with the potential of 18keV or more;
step 3.4, when the device enters a position with the height of 61km in a black barrier area, transmitting the X-rays with the voltage of more than or equal to 20keV to an International Space Station (ISS) in a thin atmosphere, wherein the transmission coefficient of the X-rays with the voltage of more than or equal to 20keV exceeds 75%, and transmitting the X-rays with the voltage of 20keV and 50keV to the International Space Station (ISS) in the thin atmosphere, wherein the transmission coefficient of the X-rays with the voltage of more than 75% and 95%, so that the X-rays with the voltage; when entering a position with a black barrier area height of 50km, uplink communication is carried out in a thin atmosphere by using X rays with a voltage of more than or equal to 50 keV; when entering a position with the height of 40km in a black barrier area, uplink communication needs to be carried out in a thin atmosphere by using X-rays with the keV being more than or equal to 150 keV;
and 3.5, transmitting the X-rays with the transmission coefficients of 0 percent, 40 percent, 60 percent and 80 percent to an International Space Station (ISS) in a thin atmosphere by utilizing X-rays with the voltage of 20keV, 50keV, 200keV and 500keV when the position is 30km away from the height of the black barrier area. Therefore, the effective transmission of signals can be carried out by selecting X-rays with the power more than or equal to 200keV, and the requirement of matching with a high-power X-ray source is met;
and 3.6, taking the height as a reference, and selecting proper X-ray energy according to the corresponding height to reliably transmit uplink data in the process that the aircraft enters the atmosphere again.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (3)
1. A method suitable for black-out area X-ray communication in an aircraft reentry process is characterized in that: the method comprises the following steps:
step 1, carrying out analog-to-digital conversion on voice and video information to be transmitted into digital signals serving as modulation signals, and waiting for modulation of carrier signals;
step 2, aiming at the modulation signal obtained in the step 1, an X-ray generator in the aircraft cabin modulates and generates uplink communication data to be transmitted;
step 3, according to different position heights of a plasma sheath formed when the aircraft reenters the atmosphere, different X-ray energies are selected in real time for uplink transmission aiming at the modulated signals obtained in the step 2;
the step 3 specifically comprises the following steps:
step 3.1, according to different position heights of the aircraft re-entering the atmosphere, aiming at the modulated signals obtained in the step 2, selecting different X-ray energies to carry out uplink transmission;
3.2, when the mobile terminal just enters a position with the height of 90km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 10 keV; when entering a position with the height of 80km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 15 keV; when entering a position with the height of 70km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 18 keV;
3.3, when the mobile terminal enters a position with the height of 61km in a black barrier area, performing uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 20 keV; when entering a position with a black barrier area height of 50km, carrying out uplink communication in a thin atmosphere by using X rays with a voltage of more than or equal to 50 keV; when entering a position with the height of 40km in a black barrier area, carrying out uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 150 keV;
3.4, when the user leaves the position with the height of 30km of the black barrier area, performing uplink communication in a thin atmosphere by using X rays with the keV of more than or equal to 200 keV;
and 3.5, taking the height as a reference, and selecting proper X-ray energy according to the corresponding height to reliably transmit uplink data in the process that the aircraft enters the atmosphere again.
2. The method for blackout area X-ray communication during aircraft reentry of claim 1, wherein: the step 1 specifically comprises the following steps:
step 1.1, as a common signal modulation method for X-ray communication, binary amplitude shift keying and multi-pulse position modulation are available;
step 1.2, a binary phase shift keying modulation method is selected, which utilizes two phases to transmit binary symbols, the common phases are 0 and pi, and T is carried out in the nth time slot (n-1)b≤t＜nTbAbove, its signal can be expressedIs composed of
The baseband signal m (t), after modulation of the carrier signal, is sBPSK(t)＝Am(t)cos2πfcT, where A is the carrier signal amplitude, TbIs the carrier period, fcIs the center frequency of the carrier signal;
step 1.3, corresponding to this, such methods that rely on accurate carrier frequency or phase information for reception are coherent reception or coherent demodulation.
3. The method for blackout area X-ray communication during aircraft reentry of claim 2, wherein: the step 2 specifically comprises the following steps:
step 2.1, aiming at the modulation signal obtained in the step 1, an X-ray generator in the aircraft cabin modulates and generates uplink communication data to be transmitted;
and 2.2, aiming at the signals emitted by the X-ray generator in the aircraft cabin, effectively focusing and collimating the X-rays to improve the effective transmission of the signals.
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| CN108631866A (en) * | 2018-04-19 | 2018-10-09 | 云南电网有限责任公司电力科学研究院 | A kind of means of communication and system |
| CN110868281A (en) * | 2019-11-07 | 2020-03-06 | 西北工业大学 | Anti-blackout communication method based on carrier aggregation and frequency diversity |
| CN111106875B (en) * | 2019-12-17 | 2021-08-31 | 中国科学院国家空间科学中心 | Black barrier area X-ray communication system and method thereof |
| CN112260753B (en) * | 2020-10-19 | 2022-02-01 | 中国核动力研究设计院 | Gamma-ray energy modulation communication system and method |
| CN112260763B (en) * | 2020-10-19 | 2022-01-18 | 中国核动力研究设计院 | Ray position modulation communication system and communication method |
| CN112260767A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Infrared-gamma ray combined wireless communication system and communication method |
| CN112333909B (en) * | 2020-11-30 | 2021-09-03 | 西安电子科技大学 | Plasma sheath ground simulation electromagnetic experiment device and using method |
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Non-Patent Citations (3)
| Title |
|---|
| X射线空间导航与通信应用研究;蒙静 等;《第六届中国卫星导航学术年会论文集—S09PNT体系与导航新技术》;20150531;120-124 * |
| 基于X射线的新一代深空无线通信;赵宝升 等;《光子学报》;20130731;801-804 * |
| 空间X射线通信传输模型与功率分析;苏桐 等;《2015 年（第七届）西部光子学学术会议论文集》;20151031;35 * |
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