Collimating/focusing optical system designed for hard X-ray communication

Wang, Yiyang; Liu, Yunpeng; Mu, J.; Feng, Zhaopeng; Tang, Xiaobin

doi:10.1016/j.nima.2021.165776

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…These studies built a solid foundation for XCOM development. In addition, Tang et al conducted a series of studies regarding XCOM, including the penetrative properties of X-rays [14], X-ray high frequency pulse emission characteristics [15], and collimating/ focusing optical systems [16]. The potential applications of XCOM in the Mars scenario [3,17] and during Earth reentry [18][19][20] were also studied.…”

Section: X-ray Communication (Xcom) Is a Revolutionary Technique In S...mentioning

confidence: 99%

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

Song,

Lu,

Wang

2023

International Journal of Aerospace Engineering

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X-ray communication (XCOM) is an emerging laser communication technique for deep space applications. Traditional link acquisition of laser communications depends significantly on Earth support and shows little autonomy. For XCOM, a pulsar vector observation-based link acquisition method is proposed, which utilizes noncooperative pulsars in deep space as beacons to acquire absolute attitude information and accomplish link acquisition. Firstly, a pulsar vector observation model was established based on the coordinate definition of the X-ray detector and X-ray collimator model. Secondly, a modified “success-failure” pulsar vector search algorithm with two degrees of freedom was proposed to acquire the pulsar vector. With the pulsar vector and the relative attitude obtained from inertial sensors, the link acquisition pointing vector could be determined. Finally, the performance of the proposed method was evaluated using numerical experiments, and factors that influence the performance are discussed and analyzed.

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Section: X-ray Communication (Xcom) Is a Revolutionary Technique In S...mentioning

confidence: 99%

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

Song,

Lu,

Wang

2023

International Journal of Aerospace Engineering

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“…One way is to develop novel information transmission methods based on expert hardware devices. For example, the optimization of supermirrors enables the advanced collection efficiency of X-rays, the signal-to-noise ratio of which reaches 71.8 dB at 100 km and 50.1 dB at 1000 km [ 9 ]. An axial grid ionization system was designed and a neutron irradiator was tested to assess the performance [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Distributed Diagnoses Based on Constructing a Private Chain via a Public Network

Li,

Zhan

2023

Entropy

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Secure online consultations can provide convenient medical services to patients who require experts from different regions. Moreover, this process can save time, which is critical in emergency cases, and cut medical costs. However, medical services need a high level of privacy protection that advances the difficulty of a construction method. It is a good idea to construct a virtual private chain through public networks by means of cryptology and identity verification. For this purpose, novel protocols are proposed to finish the package layout, secure transmission, and authorization. By mining the special characteristics of this application, two different kinds of encryption channels were designed to support the proposed protocol to ensure the secure transmission of data. And Hash values and multiple checking were employed in the transmission package to find the incompleteness of data related to network errors or attacks. Besides the secure communication of medical information, the Extended Chinese Remainder Theorem was utilized to finish the approval during a change in committee in emergency situations. Finally, example case was used to verify the effectiveness of the total methods.

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“…Therefore, XCOM is especially suitable for deep space communication or interstellar communication. Wang et al [4] theoretically calculated the feasibility of XCOM in thousands of kilometers communication. The x-ray energy suitable for XCOM is below 50 keV and the signal direction angle is generally required to be in the order of milliradian according to the current research on XCOM.…”

Section: Introductionmentioning

confidence: 99%

X-ray high frequency pulse emission characteristic and application of CNT cold cathode x-ray source cathode x-ray source

et al. 2021

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Carbon nanotube (CNT) field-emission x-ray source has great potential in x-ray communication (XCOM) because of its controllable emission and instantaneous response. A novel voltage loading mode was proposed in this work to achieve high-frequency pulse x-ray emission. The characteristics of cathode current and pulse x-ray versus voltage, frequency, and pulse amplitude were studied, and XCOM data transmission experiment was carried out. Results showed that the CNT cold cathode x-ray source, as a communication signal source, could work in 1.05 MHz pulse emission frequency. When the grid voltage was higher than 470 V, the pulse x-ray waveform amplitude achieved peak, and the shape exhibited a pseudo square wave. The duty cycle of the x-ray waveform exceeded 50%, reaching 56% when the pulse frequency reached 1 MHz. In the XCOM data transmission experiment, the pulsed x-ray waveform was well consistent with the loading data signal voltage waveform under different pulse-emission frequencies. This work realized the x-ray high-frequency pulse emission of CNT cold cathode x-ray source and lays a foundation for the development and application of CNT cold cathode x-ray source in XCOM.

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Collimating/focusing optical system designed for hard X-ray communication

Cited by 6 publications

References 17 publications

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

A Pulsar Vector Observation-Based Link Acquisition Method for X-Ray Communications

Distributed Diagnoses Based on Constructing a Private Chain via a Public Network

X-ray high frequency pulse emission characteristic and application of CNT cold cathode x-ray source cathode x-ray source

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