@Article{VasconcelosLeiKusRobLop:2019:PhSoSt,
author = "Vasconcelos, Luiz Eduardo Guarino de and Leite, Nelson Paiva
Oliveira and Kusumoto, Andr{\'e} Yoshimi and Roberto, Leandro and
Lopes, Cristina Moniz Ara{\'u}jo",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
de Pesquisas e Ensaios em Voo (IPEV)} and {Instituto de Pesquisas
e Ensaios em Voo (IPEV)} and {Instituto de Estudos
Avan{\c{c}}ados (IEAv)} and {Instituto Tecnol{\'o}gico de
Aeron{\'a}utica (ITA)}",
title = "Store separation: photogrammetric solution for the static ejection
test",
journal = "International Journal of Aerospace Engineering",
year = "2019",
volume = "2019",
number = "6708450",
abstract = "The process of developing and certifying aircraft and aeronautical
systems requires the execution of experimental flight test
campaigns to determine the actual characteristics of the system
being developed and/or validated. In this process, there are many
campaigns that are inherently dangerous, such as the store
separation. In this particular case, the greatest risk is the
collision of the store with the fuselage of the aircraft. To
mitigate the risks of this campaign, it is necessary to compare
the actual trajectory of a separation with its simulated
estimates. With such information, it is possible to decide whether
the next store release can be done with the required safety and/or
whether the model used to estimate the separation trajectory is
valid or not. Consequently, exact determination of the trajectory
of the separation is necessary. Store separation is a strategic,
relevant, and complex process for all nations. The two main
techniques for determining the quantitative store trajectory data
with 6DoF (six degrees of freedom) are photogrammetry and
instrumented telemetry packages (data obtained from inertial
sensors that are installed in the store). Each presents advantages
and disadvantages. In regard to photogrammetry, several market
solutions can be used to perform these tests. However, the result
of the separation trajectory is only obtained after the test
flight, and therefore, it is not possible to safely carry out more
than one on the same flight. In this context, the development and
validation of a solution that will allow the realization of near
real-time separation analysis are in fact an innovative and
original work. This paper discusses the development and
validation, through actual static ejection tests, of the
components that will compose a new onboard optical trajectory
system for use in store separation campaigns. This solution
includes the implementation of a three-dimensional (3D)
calibration field that allows calibration of the optical assembly
with just one photo per optical assembly, development of a
complete analytical model for camera calibration, and development
of specific software for identification and tracking of targets in
two-dimensional (2D) coordinate images and three-dimensional (3D)
coordinate trajectory calculation. In relation to the calibration,
the analytical model is based on a pinhole type camera and
considers its intrinsic parameters. This allowed for a mean square
error smaller than +/- 3.9 pixels @1 sigma. The 3D analysis
software for 6DoF trajectory expression was developed using
photogrammetry techniques and absolute orientation. The
uncertainty associated with the position measurement of each of
the markers varies from +/- 0.02mm to +/- 8.00mm @1 sigma,
depending on the geometry of the viewing angles. The experiments
were carried out at IPEV (Flight Test Research Institute)/Brazil,
and the results were considered satisfactory. We advocate that the
knowledge gained through this research contributes to the
development of new methods that permit almost real-time analysis
in store separation tests.",
doi = "10.1155/2019/6708450",
url = "http://dx.doi.org/10.1155/2019/6708450",
issn = "1687-5966",
language = "en",
urlaccessdate = "24 abr. 2024"
}