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Amphibians and reptiles of Samar Island Natural Park, Philippines, with an updated checklist, a rediscovery, and new records for Samar Island. [PDF]

Zookeys
Diesmos MLL, Del Prado YLC, Kim PMM, Caguimbal NALE, Venturina REL, Lorenzo Ii AN, Diesmos AC.   +6 more
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Starshade formation flying II: formation control

Journal of Astronomical Telescopes, Instruments, and Systems, 2020
Several starshade concepts for imaging exo-Earths would operate at the second Earth–Sun Lagrange point (L2) and consist of a starshade flying in formation tens to hundreds of thousands of kilometers from a telescope. The starshade would need to maintain meter-level lateral alignment with the line of sight from telescope to target star.
Thibault L. B. Flinois, Daniel P. Scharf, Carl R. Seubert, Michael Bottom, Stefan R. Martin   +4 more
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Formation-flying interferometry

SPIE Proceedings, 2003
There are many advantages to space-based interferometry, but monolithic, single-spacecraft platforms set limits on the collecting area and baseline length. These constraints can be overcome by distributing the optical elements of the interferometer over a system of multiple spacecraft flying in precise formation, opening up new realms of angular ...
Oliver P. Lay, Gary H. Blackwood
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Technology validation of the autonomous formation flying sensor for precision formation flying

2003 IEEE Aerospace Conference Proceedings (Cat. No.03TH8652), 2004
A Radio Frequency (RF) based sensor, called the Autonomous Formation Flying (AFF) sensor, has been developed to enable deep space precision formation flying by measuring the relative range and bearing angles between multiple spacecraft. The AFF sensor operates at Ka-band and uses signal-processing schemes inherited from the Global Positioning System ...
J.Y. Tien, G.H. Purcell, L.R. Amaro, L.E. Young, null Mimi Aung, J.M. Srinivasan, E.D. Archer, A.M. Vozoff, null Yong Chong   +8 more
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Spacecraft Formation Flying

2012
Spacecraft formation flying is an important application of networked dynamical systems. Attitude control of the spacecraft is an indispensable (many applications place strict requirements on it) and difficult (due to the nonlinear dynamics) problem being studied for decades.
Ziyang Meng, Tao Yang, Karl H. Johansson
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Formation Flying Satellites: Control By an Astrodynamicist

Celestial Mechanics and Dynamical Astronomy, 2001
Potential periodic formation orbits can be identified using Hill's equation. However, as gravitational perturbations destroy the periodicity, a control is required to maintain the desired orbits. Here, the authors address the control of individual satellites as well as the control of the whole constellation.
Alfriend, Kyle T., Vadali, Srinivas R., Schaub, Hanspeter   +2 more
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Optimal Reconfiguration Manoeuvres in Formation Flying Missions

2021 IEEE Aerospace Conference (50100), 2021
Most of the current formation flying systems are intended to work in a single, stable orbital configuration acquired shortly after the launch. However, the formation flying concept lends itself to be used in a flexible manner, by introducing the possibility of changing the relative configuration of the platforms, i.e.
Dharmarajan, K., Palmerini, G. B.
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Satellite Formation Flying Maneuver Control

Mekhatronika, Avtomatizatsiya, Upravlenie, 2019
A problem of a formation flying satellites maneuver control is presented. Among the most important criteria for satellite formation flying control system are active period maximization, precision of the configuration, secure motion (without collisions of satellites).
M. V. Palkin, I. P. Titkov
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