scholarly journals Feasibility of cooling the Earth with a cloud of small spacecraft near the inner Lagrange point (L1)

2006 ◽  
Vol 103 (46) ◽  
pp. 17184-17189 ◽  
Author(s):  
R. Angel
Keyword(s):  
Lagrange Point ◽  
Small Spacecraft ◽  
The Earth

Analysis of the features of the implementation of the launch unit flight scheme for micro spacecraft injections in an intermediate orbit with synchronous precession

2019 ◽  
Author(s):  
D.A. Zelvin ◽  
A.G. Toporkov
Keyword(s):  
Fuel Consumption ◽  
World Ocean ◽  
Unit Operation ◽  
Reference Orbit ◽  
Small Spacecraft ◽  
Intermediate Orbit ◽  
The Earth ◽  
The World ◽  
Flight Scheme ◽  
Selection Of

The article considers features of the implementation of the launching scheme for a group of small spacecraft at the stage of the Volga type launch unit operation during the transition from the reference orbit formed by the “Soyuz 2.1 v” launch vehicle to the intermediate orbit, where the small spacecraft separate. The orbit with synchronous precession velocity of the ascending node longitude with respect to the working orbit is chosen as an intermediate orbit, to which the small spacecraft transfer independently, using their propulsion system, after separation from the launch unit. The article solves the problem of choosing the rational orientation of the launch unit during the release of pulses, in the passive flight segments, as well as for the safe separation of the small spacecraft in an intermediate orbit with synchronous precession. Parameters of maneuvers to flood launch unit after separation of small spacecraft are calculated. Numerical results of fuel consumption for direct deorbiting and selection of maneuvering intervals for launch unit submersion in a given area of the world ocean are obtained. The calculations of the Earth shadow- and semishadow-sunlight time for small spacecraft are performed.

scholarly journals Earth Observations from DSCOVR EPIC Instrument

2018 ◽  
Vol 99 (9) ◽  
pp. 1829-1850 ◽  
Author(s):  
Alexander Marshak ◽  
Jay Herman ◽  
Szabo Adam ◽  
Blank Karin ◽  
Simon Carn ◽  
...  
Keyword(s):  
Spectral Reflectance ◽  
Total Ozone ◽  
Volcanic Eruptions ◽  
Ice Crystals ◽  
Radiometric Calibration ◽  
Lagrange Point ◽  
Earth Observations ◽  
The Earth ◽  
Imaging Camera ◽  
Band Absorption

AbstractThe National Oceanic and Atmospheric Administration (NOAA) Deep Space Climate Observatory (DSCOVR) spacecraft was launched on 11 February 2015 and in June 2015 achieved its orbit at the first Lagrange point (L1), 1.5 million km from Earth toward the sun. There are two National Aeronautics and Space Administration (NASA) Earth-observing instruments on board: the Earth Polychromatic Imaging Camera (EPIC) and the National Institute of Standards and Technology Advanced Radiometer (NISTAR). The purpose of this paper is to describe various capabilities of the DSCOVR EPIC instrument. EPIC views the entire sunlit Earth from sunrise to sunset at the backscattering direction (scattering angles between 168.5° and 175.5°) with 10 narrowband filters: 317, 325, 340, 388, 443, 552, 680, 688, 764, and 779 nm. We discuss a number of preprocessing steps necessary for EPIC calibration including the geolocation algorithm and the radiometric calibration for each wavelength channel in terms of EPIC counts per second for conversion to reflectance units. The principal EPIC products are total ozone (O3) amount, scene reflectivity, erythemal irradiance, ultraviolet (UV) aerosol properties, sulfur dioxide (SO2) for volcanic eruptions, surface spectral reflectance, vegetation properties, and cloud products including cloud height. Finally, we describe the observation of horizontally oriented ice crystals in clouds and the unexpected use of the O2 B-band absorption for vegetation properties.

scholarly journals Earth Imaging From the Surface of the Moon With a DSCOVR/EPIC-Type Camera

2021 ◽  
Vol 2 ◽  
Author(s):  
Nick Gorkavyi ◽  
Simon Carn ◽  
Matt DeLand ◽  
Yuri Knyazikhin ◽  
Nick Krotkov ◽  
...  
Keyword(s):  
Full Range ◽  
Surface Reflectance ◽  
The Moon ◽  
Lagrange Point ◽  
Volcanic Clouds ◽  
The Earth ◽  
Imaging Camera ◽  
Reflectance Factor ◽  
Stratospheric Clouds ◽  
Phase Angles

The Earth Polychromatic Imaging Camera (EPIC) on the Deep Space Climate Observatory (DSCOVR) satellite observes the entire Sun-illuminated Earth from sunrise to sunset from the L1 Sun-Earth Lagrange point. The L1 location, however, confines the observed phase angles to ∼2°–12°, a nearly backscattering direction, precluding any information on the bidirectional surface reflectance factor (BRF) or cloud/aerosol phase function. Deploying an analog of EPIC on the Moon’s surface would offer a unique opportunity to image the full range of Earth phases, including observing ocean/cloud glint reflection for different phase angles; monitoring of transient volcanic clouds; detection of circum-polar mesospheric and stratospheric clouds; estimating the surface BRF and full phase-angle integrated albedo; and monitoring of vegetation characteristics for different phase angles.

Small spacecraft-based space system for real-time Earth surface monitoring

2021 ◽  
pp. 42-55
Author(s):  
Aleksandr P. DANYLKIN ◽  
Vladimir N. VORONKOV ◽  
Oleg Yu. KAZANTSEV ◽  
Vyacheslav A. KETOV ◽  
Yury N. KOPTEV ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Real Time ◽  
Earth Surface ◽  
Space System ◽  
Earth Remote Sensing ◽  
Design Studies ◽  
Small Spacecraft ◽  
Ground Station ◽  
Current State ◽  
The Earth

The paper presents basic results of exploratory design studies into a space system for real-time monitoring of the Earth surface based on small spacecraft* for Earth remote sensing, which provides acquisition in real time of highly detailed Earth surface images with resolution of 0.7–1.0 m, a swath of 20 km and 15m in-plane georeferencing accuracy from a ~300 km orbit with a mass of spacecraft ~200 kgf repeating with high frequency (at least every 1.0–1.5h). The said parameters are in line with the current state of the art and are quite feasible for our country’s industry. _________________________________________ * — for the purposes of this paper ‘small spacecraft’ is a 150-220 kg spacecraft. Key words: small spacecraft, space system, Earth remote sensing, satellite bus, payload module, electro-optical equipment, multipurpose ground facility, combined ground station, services of space monitoring of the Earth surface.

scholarly journals NANOSATELLITE MOTION SIMULATION FOR TESTING THE SUN SENSOR

2021 ◽  
Vol 118 (3) ◽  
pp. 34-42
Author(s):  
Yerkebulan Nurgizat
Keyword(s):  
Mathematical Model ◽  
The Sun ◽  
Motion Simulation ◽  
Test Results ◽  
Solar Panels ◽  
Small Spacecraft ◽  
Sun Sensor ◽  
The Earth ◽  
High Orientation

Nanosatellite (NS) began to perform complex missions that require high orientation. In this research, we developed a mathematical model of solar sensors to determine the orientation of a NS. Various moments of obtaining the angle of the sun's rays when they hit the solar sensors were presented. The test results of the solar sensors used to simulate various orbit scenarios are described in detail, and graphs of the solar sensor readings are plotted based on the results obtained. The article deals with modeling the motion of a NS in orbit. The NS is equipped with 6 solar panels. The VTS software was used to simulate the motion of the NS. Also, in the study of determining the orientation, two different problems were considered, that is, when the satellite is in the shadow part of the earth and when it is in the solar part of the earth. For these tasks, a mathematical model for determining the orientation was built. This method is very relevant for the study of small spacecraft.

Sign in / Sign up

Export Citation Format

Share Document