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LRI - DOAJ

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Last Updated: 03 October 2022

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Comparing GRACE-FO KBR and LRI Ranging Data with Focus on Carrier Frequency Variations

This mission hosts two ranging devices, a conventional microwave system based on K-band ranging, and a novel laser ranger, both relying on interferometric phase readout. We explain in this paper how the phase measurements can be converted into range data by using a time-dependent carrier frequency that takes into account potential intraday variability in the microwave or laser frequency. It turns out that considering intraday carrier frequency variations in the processing, KBR and LRI biased range measurements can be marginally enhanced.

Source link: https://doi.org/10.3390/rs14174335


Relative Kinematic Orbit Determination for GRACE-FO Satellite by Jointing GPS and LRI

The first in-orbit formation satellites equipped with a Laser Ranging Interferometer device, Gravity Recovery and Climate Experiment Follow-on satellites are designed to determine the efficiency of the latest LRI ranging system used to satellite-to-satellite tracking, with satellite-to-satellite tracking. GPS and LRI technologies could reduce the effects of GPS measurement errors and increase the reliability of orbit determination of the GRACE-FO satellites. The GPS/LRI observation model's linearization and calculation of the GPS/LRI relative kinematic orbit determination are included in this series. The findings of the reference orbit survey reveal that GRACE-FO relative kinematic orbit determination along X, Y, and Z directions is more accurate than 2. 9 cm. GPS/LRI improves the accuracy of the relative kinematic orbit estimation by GPS only by around 1 cm along with X, Y, and Z directions, while 3D directions increase the accuracy of the relative kinematic orbit determination by about 1. 8 cm.

Source link: https://doi.org/10.3390/rs14040993


Challenges of complex monitoring of the curing parameters in coupons for LRI manufacturing

Liquid Resin Infusion, a liquid pre-impregnated fabric manufacturing process, is increasingly important in the aerospace industry as an out-of-autoclave alternative manufacturing process to traditional pre-impregnated fabrics. With an integrated numerical-experimental approach, the ELADINE project seeks to identify and quantify the key manufacturing parameters that lead to shape distortions on composite coupons. The manufacturing process will be thoroughly tracked via Fiber Optics Sensors and Dielectric sensors to know how the process variables influence the distortion phenomena. This article discusses the preliminary findings of the LRI's product monitoring program.

Source link: https://doi.org/10.13111/2066-8201.2021.13.1.21


LRI-fabricated composite demonstrators for an aircraft fuselage on the basis of a Building Block design approach

For the production of composite aircraft demonstrators, a Liquid Resin Infusion manufacturing process is described. The quality of fabrication is determined by means of micromechanical models and coupon mechanical testing, as well as the fiber volume fraction and the composition of the composite ply.

Source link: https://doi.org/10.1016/j.jcomc.2021.100178

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* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions