X-ray transmittance characteristics and potential communication in re-enter plasma sheath

Li, Yao; Su, Tong; Sheng, Lizhi; Qiang, Pengfei; Xu, Nan; Zhao, Bin

doi:10.1016/j.ijleo.2019.06.017

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…, which takes advantage of the high energy and excellent penetrative properties of X-rays in deep space [3,4] and is widely studied. In China, Zhao et al first discussed the application of X-rays in space communication [5].…”

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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“…However, the practical shortcomings and engineering obstacles of these methods have not been satisfactorily resolved. A probably feasible solution, aiming at adapting to the high dynamics and large-scale fading characteristics of the plasma sheath channel, is to design adaptive communication methods to alleviate communication blackout, such as increasing transmitted power or communication frequency [17], employing low-frequency communication [18], channel prediction relied on the reflected waves [19], and using an adaptive data rate control method based on the antenna voltage standing wave ratio (VSWR) [20]. Regarding modulation and demodulation methods over the PS channel, [21] and [22] investigated the performance of traditional modulation methods over the PS channel from theoretical and experimental perspectives, respectively.…”

Section: Introductionmentioning

confidence: 99%

Adaptive protograph-based BICM-ID relying on the RJ-MCMC algorithm: a reliable and efficient transmission solution for plasma sheath channels

Liu¹,

Wei²,

Shi³

et al. 2022

Plasma Sci. Technol.

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For reentry communication, owing to the influence of the highly dynamic plasma sheath (PS), the parasitic modulation effect can occur and the received phase shift keying (PSK) signal constellation can be severely rotated, leading to unacceptable demodulation performance degradation. In this work, an adaptive noncoherent bit-interleaved coded modulation with iterative decoding (BICM-ID) system with binary PSK (BPSK) modulation and protograph low-density parity-check (LDPC) under the PS channel is proposed. The proposed protograph-based BICM-ID (P-BICM-ID) system can achieve joint processing of demodulation and decoding, where the soft information is adaptively estimated by reversible-jump Markov chain Monte Carlo (RJ-MCMC) algorithms. Simulation results indicate that the proposed system can adapt well to the dramatic and nonstationary characteristics of the PS channel and can obtain a greater 5 dB performance improvement compared to existing algorithms at a bit error rate (BER) of 10−6. Index Terms—Plasma sheath, BICM-ID, Markov Model, Joint Demodulation and Decoding.

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“…The safety of x-ray for application is generally not considered due to the particular application environment of XCOM. XCOM has the advantages of high penetration, strong anti-interference ability, and wide transmission band, and the theoretical maximum transmission rate could reach 40 000 Tbps [5]. Given these distinctive advantages, XCOM is expected to solve the communication problems in blackout region, deepspace communication, and other fields [6].…”

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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X-ray transmittance characteristics and potential communication in re-enter plasma sheath

Cited by 8 publications

References 13 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

Adaptive protograph-based BICM-ID relying on the RJ-MCMC algorithm: a reliable and efficient transmission solution for plasma sheath channels

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

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