نتایج جستجو برای: in flight alignment
تعداد نتایج: 16995162 فیلتر نتایج به سال:
Navigation in autonomous vehicles involves integrating measurements from on–board inertial sensors and external data collected by various sensors. In this paper, the computer–frame velocity error model is augmented with a random constant model of accelerometer bias and rategyro drift for use in a Kalman filter–based fusion of a lowcost rotating inertial navigation system (INS) with external pos...
We report results of a laser link experiment between a laser altimeter called light detection and ranging (LIDAR) aboard Hayabusa2 and ground-based satellite laser ranging stations conducted when the spacecraft was near the Earth before and after the gravity assist operation. Uplink laser pulses from a ground station were successfully detected at a distance of 6.6 million km, and the field of v...
Abstract: In this paper, a robust filter for an in-flight alignment (IFA) is presented to effectively eliminate system errors in the case where a strapdown inertial navigation system (SDINS) has large initial attitude errors. First, an extended robust ∞ H filter is proposed for a general nonlinear uncertain system. We also analyze the characteristics of the proposed filter, such as an ∞ H perfo...
Our recent work [1] proposed a coarse in-motion alignment method, in which the adverse effect of the Global Positioning System (GPS) antenna lever arm was reported. The current note improves [1] by accounting for the prior knowledge of the lever arm. This note uses the same set of symbols as in [1] for brevity. Suppose the GPS antenna is rigidly fixed relative to the inertial navigation system ...
Ratites (ostriches, emus, rheas, cassowaries, and kiwis) are large, flightless birds that have long fascinated biologists. Their current distribution on isolated southern land masses is believed to reflect the breakup of the paleocontinent of Gondwana. The prevailing view is that ratites are monophyletic, with the flighted tinamous as their sister group, suggesting a single loss of flight in th...
The Space Flight Laboratory of the University of Toronto Institute for Aerospace Studies has developed a prototype ground station antenna array correlator that offers advantages over previously employed approaches for weak signal communication. By using Orthogonal Frequency Division Multiplexing (OFDM) in the microspacecraft transmission, the array can perform frequency correlation in addition ...
To test if migratory monarch butterflies use polarized light patterns as part of their time-compensated sun compass, we recorded their virtual flight paths in a flight simulator while the butterflies were exposed to patches of naturally polarized blue sky, artificial polarizers or a sunny sky. In addition, we tested butterflies with and without the polarized light detectors of their compound ey...
The aim of this study was the comparison of plantar pressure distribution, vertical ground reaction force and contact area between dominant and none-dominant limb in top-flight females taekwondo.10 healthy young top-flight females taekwondo were selected. plantar pressure ,vertical ground reaction force and contact area were evaluated by emed system .The obtained data were analyzed by paired -t...
One of the important preconditions for economic growth and development is the provision of capital; each society needs to provide an environment to attract foreign and domestic investment. But despite the rich revenues of oil in OPEC member countries, their business environments are largely confronted with the domestic Capital Flight and reluctance of foreign investors to invest. The purpose of...
The drive towards utilizing small, cheap, autonomous aerial vehicles for military operations means that navigation systems that are robust to GPS denial must be employed. The simplest option available is to increase the accuracy of the inertial measurement unit (IMU), but this can substantially increase the price per operational unit. This paper presents an overview of the All-Source Navigation...
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