X-ray communication based simultaneous communication and ranging

Song, Shuo; Xu, Luping; Zhang, Hua; Gao, Na

doi:10.1088/1674-1056/24/9/094215

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…Remark 3.4. If Z has finite topological type, it is a theorem of Bailin Song [59] that any open set U ⊂ Z is small. In particular, the global section algebra Ω ch (Z) has the strong generating set (3.6) and relations (3.8).…”

Section: Coordinate-free Descriptionmentioning

confidence: 99%

Twisted Chiral de Rham Complex, Generalized Geometry, and T-duality

Linshaw

Mathai

2015

Commun. Math. Phys.

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Abstract. The chiral de Rham complex of Malikov, Schechtman, and Vaintrob, is a sheaf of differential graded vertex algebras that exists on any smooth manifold Z, and contains the ordinary de Rham complex at weight zero. Given a closed 3-form H on Z, we construct the twisted chiral de Rham differential D H , which coincides with the ordinary twisted differential in weight zero. We show that its cohomology vanishes in positive weight and coincides with the ordinary twisted cohomology in weight zero. As a consequence, we propose that in a background flux, Ramond-Ramond fields can be interpreted as D H -closed elements of the chiral de Rham complex. Given a T-dual pair of principal circle bundles Z, Z with fluxes H, H, we establish a degree-shifting linear isomorphism between a central quotient of the iR[t]-invariant chiral de Rham complexes of Z and Z. At weight zero, it restricts to the usual isomorphism of S 1 -invariant differential forms, and induces the usual isomorphism in twisted cohomology. This is interpreted as T-duality in type II string theory from a loop space perspective. A key ingredient in defining this isomorphism is the language of Courant algebroids, which clarifies the notion of functoriality of the chiral de Rham complex.

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Section: Coordinate-free Descriptionmentioning

confidence: 99%

Twisted Chiral de Rham Complex, Generalized Geometry, and T-duality

Linshaw

Mathai

2015

Commun. Math. Phys.

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“…Actually, there is much more potential in combining XNAV with XCOM. Besides accurate range measurement, XCOM-based simultaneous communication and ranging could also provide communication services [ 21 ]. As is known to all, the phase revolution model is of great importance in estimating TOA in XNAV and should be updated periodically [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Novel X-ray Communication Based XNAV Augmentation Method Using X-ray Detectors

Song

Zhang

et al. 2015

Sensors

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The further development of X-ray pulsar-based NAVigation (XNAV) is hindered by its lack of accuracy, so accuracy improvement has become a critical issue for XNAV. In this paper, an XNAV augmentation method which utilizes both pulsar observation and X-ray ranging observation for navigation filtering is proposed to deal with this issue. As a newly emerged concept, X-ray communication (XCOM) shows great potential in space exploration. X-ray ranging, derived from XCOM, could achieve high accuracy in range measurement, which could provide accurate information for XNAV. For the proposed method, the measurement models of pulsar observation and range measurement observation are established, and a Kalman filtering algorithm based on the observations and orbit dynamics is proposed to estimate the position and velocity of a spacecraft. A performance comparison of the proposed method with the traditional pulsar observation method is conducted by numerical experiments. Besides, the parameters that influence the performance of the proposed method, such as the pulsar observation time, the SNR of the ranging signal, etc., are analyzed and evaluated by numerical experiments.

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“…Another application of XCOM is the integrated design of range measurement and communication. Dr. Song [8] proposed a novel X-ray polarized ranging method based on circular polarization modulation, which is termed X-ray circularly polarized ranging (XCPolR). XCPolR…”

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confidence: 99%

Design of An Intelligent Demodulation Method for X-ray Spectrum Communication

Gao

Dong²,

Jin³

2023

J. Phys.: Conf. Ser.

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X-ray communication based on X-ray spectrum modulation information is a novel communication method, which can effectively improve communication ability and anti-interference ability. In this paper, four characteristic X-rays are chosen to modulate information. The influence of channel attenuation, random noise in space, and miss-shooting rate caused by adjacent targets are discussed. Based on error-correcting output codes and a 10-fold cross-validation method, a neural network intelligent classifier is designed to realize intelligent information demodulation. Simulation results show that if the miss-shooting rate is lower than 0.4 and the photon retention rate after channel attenuation is higher than 0.0008, then the classifier can achieve a recognition success rate of more than 99%. This study provides reliable index requirements for the performance of the four-target material source equipment to be designed next. This paper also provides a theoretical basis for the subsequent further realization of space communication capabilities.

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X-ray communication based simultaneous communication and ranging

Cited by 10 publications

References 23 publications

Twisted Chiral de Rham Complex, Generalized Geometry, and T-duality

Twisted Chiral de Rham Complex, Generalized Geometry, and T-duality

Novel X-ray Communication Based XNAV Augmentation Method Using X-ray Detectors

Design of An Intelligent Demodulation Method for X-ray Spectrum Communication

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