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Have pulsar timing array methods detected a cosmological phase transition?
Physical Review DWe show that the recent detection of a gravitational wave (GW) background reported by various pulsar timing array (PTA) collaborations including NANOGrav-15yr, PPTA, EPTA, and CPTA can be explained in terms of first order phase transitions (FOPTs) from dark sector models (DSM).
Andrea Addazi +3 more
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A method to calibrate the on-board timing based on pulsar observation
2011 6th IEEE Conference on Industrial Electronics and Applications, 2011 Considering the on-board clock stability, the paper presents a method of timing calibration strategy based on the observation of pulsars, a natural celestial source, in order to improve the timing accuracy. A calibration model is established and the error factors are considered based on the characteristic of pulsars' stable and periodical signals, and ...
Shengchang Lan +3 more
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Detector random time delay compensation method for X-ray pulsar observation
Optik, 2017Abstract For recent few decades, the observation for X-ray emission of pulsar is very popular. Among the multiple experiments, to construct the signal profile of X-ray pulsar is a significant one. During the observation, the X-ray signal photons of pulsars need to be collected by sensors in space.
Dapeng Zhang +5 more
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A fast pulse time-delay estimation method for X-ray pulsars based on wavelet-bispectrum
Optik, 2020Abstract X-ray pulsar-based navigation technology provides real-time aerospace information for spacecraft through the received X-ray photons. The time-delay estimation accuracy of the pulse integrated profile is one of the determinants of navigation accuracy.
Yangkun Wu, Zhiwei Kang, Jin Liu
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X-ray pulsar-based navigation method using one sensor and modified time-differenced measurement
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2017X-ray pulsar-based navigation method using one sensor (XNAVO) could fix the position of satellites by sequentially observing X-ray pulsars at the cost of loading one X-ray sensor, which drops the demand on the loading capability of satellite and is feasible for practice. However, subjected to the current research status of astronomical measure and the
Yidi Wang +4 more
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IEEE Sensors Journal, 2019
Subjected to the current observation technology, the planetary ephemerides which are used to predict the positions of planets are not accurately known. For Jupiter exploration, ephemeris error of Jupiter will greatly degrade the performance of navigation system.
Mingzhen Gui +3 more
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Subjected to the current observation technology, the planetary ephemerides which are used to predict the positions of planets are not accurately known. For Jupiter exploration, ephemeris error of Jupiter will greatly degrade the performance of navigation system.
Mingzhen Gui +3 more
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A New Pulse Time-of-Arrival Estimation Method for X-Ray Pulsar Navigation
2015X-ray pulsar navigation (XPNAV) is an important technology for long time and high precious spacecraft autonomous navigation. XPNAV system can offer position, velocity and accurate time navigation information for spacecraft in near-earth orbit, geostationary orbit, elliptic orbit or interplanetary orbit. XPNAV has an extremely important military use and
Qingqing Lin, Ping Shuai, Liangwei Huang
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Measurement Techniques, 2017
A method of measuring the pulse arrival time of the radio emission of pulsars is described. The method is based on the use of a wideband optoelectronic processor. A special feature of the processor is a special operating mode (time delay and integration mode) of a multi-element CCD photodetector in which the dispersion of the radio emission received by
A. P. Lavrov, S. A. Molodyakov
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A method of measuring the pulse arrival time of the radio emission of pulsars is described. The method is based on the use of a wideband optoelectronic processor. A special feature of the processor is a special operating mode (time delay and integration mode) of a multi-element CCD photodetector in which the dispersion of the radio emission received by
A. P. Lavrov, S. A. Molodyakov
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Differential X-Ray Pulsar Navigation Method Based on Pulse Arrival Time Difference
2022Jingjing Gao, Haiyan Fang, Jianyu Su
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