Astrod-Gw: Overview and Progress

Ni, Wei-Tou

doi:10.1142/s0218271813410046

Cited by 87 publications

(95 citation statements)

References 74 publications

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“…Subsequently we have redesigned the basic orbits of ASTROD-GW configuration to have small inclinations with respect to the ecliptic plane to resolve these issues while keeping the variation of the arm lengths in the acceptable range. [17,21] In the present paper, we work out a set of 10-year optimized ASTROD-GW mission orbit configurations using numerical ephemeris, and calculate the residual optical path differences in the first and second generation With the present pace of development, the laser frequency stabilization requirement for space equipment is expected to be able to compensate for this TDI requirement relaxation 20 years later.…”

Section: Introductionmentioning

confidence: 99%

Orbit optimization and time delay interferometry for inclined ASTROD-GW formation with half-year precession-period

Wang

2015

Chinese Phys. B

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ASTROD-GW (ASTROD [Astrodynamical Space Test of Relativity using OpticalDevices] optimized for Gravitational Wave detection) is a gravitational-wave mission with the aim of detecting gravitational waves from massive black holes, extreme mass ratio inspirals (EMRIs) and galactic compact binaries, together with testing relativistic gravity and probing dark energy and cosmology. Mission orbits of the 3 spacecrafts forming a nearly equilateral triangular array are chosen to be near the Sun-Earth Lagrange points L3, L4 and L5. The 3 spacecrafts range interferometrically with one another with arm length about 260 million kilometers. For 260 times longer arm length, the detection sensitivity of ASTROD-GW is 260 fold better than that of eLISA/NGO in the lower frequency region by assuming the same acceleration noise.Therefore, ASTROD-GW will be a better cosmological probe. In previous papers, we have worked out the time delay interferometry (TDI) for the ecliptic formation. To resolve the reflection ambiguity about the ecliptic plane in source position determination, we have changed the basic formation into slightly inclined formation with half-year precession-period. In this paper, we optimize a set of 10-year inclined ASTROD-GW mission orbits numerically using ephemeris framework starting at June 21, 2035, including cases of inclination angle is 0° (no inclination), 0.5°, 1.0°, 2 1.5°, 2.0°, 2.5° and 3.0°. We simulate the time delays of the first and second generation TDI configurations for the different inclinations, and compare/analyse the numerical results to attain the requisite sensitivity of ASTROD-GW by suppressing laser frequency noise below the secondary noises. To explicate our calculation process for different inclination cases, we take the 1.0° as example to show the orbit optimization and TDI simulation.

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Section: Introductionmentioning

confidence: 99%

Orbit optimization and time delay interferometry for inclined ASTROD-GW formation with half-year precession-period

Wang

2015

Chinese Phys. B

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“…In a powerlimited design, sometimes there is a middle flat region in which the sensitivity is limited by the photon shot noise. [7,[32][33][34] The shot noise sensitivity in the strain for GW detection is inversely proportional to P 1/2 L with P the received power and L the distance or arm length. Since P is inversely proportional to L 2 and P 1/2 L is constant, this sensitivity limit is independent of the distance.…”

Section: Sensitivitymentioning

confidence: 99%

Astrodynamical middle-frequency interferometric gravitational wave observatory AMIGO: Mission concept and orbit design

Wang

2020

Int. J. Mod. Phys. D

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AMIGO is a first-generation Astrodynamical Middle-frequency Interferometric GW Observatory. The scientific goals of AMIGO are: to bridge the spectra gap between first-generation high-frequency and low-frequency GW sensitivities; to detect intermediate mass BH coalescence; to detect inspiral phase and predict time of binary black hole coalescence together with neutron star coalescence for ground interferometers; to detect compact binary inspirals for studying stellar evolution and galactic population. The mission concept is to use time delay interferometry for a nearly triangular formation of 3 drag-free spacecraft with nominal arm length 10,000 km, emitting laser power 2-10 W and telescope diameter 300-360 mm. The design GW sensitivity in the middle frequency band is 3 × 10 −21 Hz -1 . Four options of orbits are under study: (i) Earth-like solar orbits (2-20 degrees behind the Earth); (ii) 600,000 km high orbit formation around the Earth; (iii) 50,000 km-250,000 high orbit formation around the Earth; (iv) near Earth-Moon L4 (or L5) halo orbit formation. All four options have LISAlike formations, that is the triangular formation is 60º inclined to the orbit plane. For AMIGO, the first-generation time delay interferometry is good enough for the laser frequency noise suppression. We also investigate for each options of orbits under study, whether constant equal-arm implementation is feasible. For the solar-orbit option, the acceleration to maintain the formation can be designed to be less than 15 nm/s 2 with the thruster requirement in the 15 μN range. AMIGO would be a good place to implement the constant equal-arm option. Fuel requirement, thruster noise requirement and test mass acceleration actuation requirement are briefly considered. From the orbit study, the solar orbit option is the first mission orbit choice. We study the deployment for this orbit option. A last-stage launch from 300 km LEO (Low Earth Orbit) to an appropriate 2-degree-behindthe-Earth AMIGO formation in 95 days requires only a v of 75 m/s.

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“…. 空间引力波探测激光干涉仪(eLISA, ASTROD-GW [85,86] , Big Bang Observer [87] , DECIGO [88,89] , Taiji [90] 和TianQin [90,91] …”

Section: 噪音分析mentioning

confidence: 99%

GW150914 and gravitational-wave astronomy

Liu¹,

Wang²,

Hu³

et al. 2016

Chin. Sci. Bull.

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Astrod-Gw: Overview and Progress

Cited by 87 publications

References 74 publications

Orbit optimization and time delay interferometry for inclined ASTROD-GW formation with half-year precession-period

Orbit optimization and time delay interferometry for inclined ASTROD-GW formation with half-year precession-period

Astrodynamical middle-frequency interferometric gravitational wave observatory AMIGO: Mission concept and orbit design

GW150914 and gravitational-wave astronomy

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