Satellite Placement Research Articles

Comprehensive Analysis of Satellite Deployment Dynamics using MATLAB

A crucial section of area missions is satellite placement, which requires proper management and analysis to guarantee undertaking fulfilment. This paper presents a comprehensive framework for evaluation and simulation of satellite deployment dynamics based on MATLAB. The proposed framework combines visualization processes, dynamics of satellite deployment, and numerical methods to accurately model satellite behaviour all through deployment ranges. The simulation platform uses MATLAB's capability which includes thrust, aerodynamic drag, and gravitational forces to represent the complicated dynamics of satellite deployment. Furthermore, the platform permits multi-satellite deployment situations and parameter-customizable analysis of unmarried and multi-satellite deployments. The performance and acceptability of the MATLAB-primarily based platform is illustrated through case research and overall performance reviews, providing insightful data for planning satellite missions, design optimization, and manipulate strategies. For engineers and academics running on satellite improvement area assignment layout, the proposed framework is a useful resource to better apprehend and examine deployment dynamics underneath numerous operational eventualities.

Analysis of Near-Earth Space for the Search of Optimal Orbits for Placement of Satellites

Analysis of Near-Earth Space for the Search of Optimal Orbits for Placement of Satellites

Searching For Optimal Areas of Circumlunar Space for Placement of Satellites Moving in Circular Orbits

Searching For Optimal Areas of Circumlunar Space for Placement of Satellites Moving in Circular Orbits

Sentiment Analysis of e-Government Service Using the Naive Bayes Algorithm

A digital platform called the Alpukat Population Application is used to handle statistics and information regarding DKI Jakarta's population. Using the Naive Bayes Classifier (NBC) approach, sentiment analysis for applications using satellite placement. The Nave Bayes Classifier technique is utilized for sentiment analysis because of its benefits in modeling and categorizing complicated data. The user reviews and comments gathered from the Google Play Store were the source of the data utilized in this research. Feature extraction using methods like TF-IDF, sentiment labeling on data, and the development of Nave Bayes Classifier models for sentiment classification were all part of the research project. It is anticipated that the study's findings would help us better understand how users interact with the Alpukat population app. This sentiment analysis may assist app administrators and developers in identifying the positives and negatives of applications and planning updates and advancements based on user feedback. It is anticipated that the sentiment classification model created using the Naive Bayes Classifier approach would be able to classify user evaluations into positive, negative, or neutral sentiment categories with a high degree of accuracy. The creation of improved alpukat positioning apps and decision-making may both benefit from this emotive analysis.

Effect of passive strut angle on the vortical structures and mixing characteristics of scramjet combustor

Scramjet is considered as the future of high-speed transportation and reusable launch vehicle for satellite placement. However, the combustion of fuel at supersonic speeds is a challenge. Since combustion takes place at high velocities, analyzing the mixing of air and fuel in the engine is important for enhancing performance. The current study focuses on two passive struts that are placed at a short distance downstream of the fuel injection strut. Diverging angles of these passive struts are varied to assess the effect of the mixing and corresponding acoustic behavior. The computational study is conducted using an improved delayed detached-eddy simulation turbulence model. The single strut scramjet configuration is taken as a benchmark to compare it with different strut configurations. The mixing efficiency is highly affected by the divergent angle of the passive strut. Mixing performance enhances as the back-pressure increases due to the passive strut. If the back-pressure becomes too high due to the divergence of the passive strut angle, then the unstart phenomenon is observed. Pressure loss is observed to decrease with a decrease in the divergence angle of the passive strut. As the divergence angle of the passive strut configuration increases, low-frequency vortices are generated. The modal analysis shows the low-frequency modes responsible for the enhanced mixing performance. Overall sound pressure level increases with an increase in the divergence angle of the passive strut.

HDOP and VDOP Analysis in an Ideal Placement Environment for Dual GNSSs.

Increasing the number of satellites in a global navigation satellite system (GNSS) improves the positioning accuracy and increases availability. However, it reduces the positioning accuracy improvement rate and increases the calculation loads, which can cause battery usage problems in mobile devices using a GNSS. An appropriate satellite selection method is required. One current method entails the use of ideal satellite placement with respect to the minimum geometric dilution of precision (GDOP). In this study, the described ideal satellite placement with the minimum GDOP were divided in terms of the horizontal dilution of precision (HDOP) and vertical dilution of precision (VDOP). HDOP and VDOP were mathematically derived and analyzed. The derived formula was verified using simulations. The analysis was performed with actual dual GNSS satellite data. The satellites adjacent to the ideal placement were selected and the DOP was calculated. Simply selecting satellites closest to the ideal placement afforded large values for HDOP and VDOP. This issue was addressed using a satellite changing algorithm considering the dual GNSS, resulting in reduced values of the HDOP and VDOP.

Global Positioning System Performance Optimization Using a Normalized Function on Configuration Classes

A mission of the U.S. Air Force Space Command is the positioning of Global Positioning System satellites to improve the accuracy of receiver navigation solutions. To that end, a technique is developed that, given a configuration specifying the number of satellites in each orbital plane, combines a nonlinear program with a simulation to find the constellation that optimizes performance. This approach is greatly expedited by a reduced set of configuration classes, which will result in significantly increased efficiency in computer runtime and constellation management. Additionally, a metric is proposed for constellation performance that normalizes receiver dilution of precision accuracy values and weights trouble spots. A tool implementing the technique and the metric is constructed and applied to three configurations. The first includes the nominal 24-satellite operational constellation, and the other two are for 27 and 31 satellites. For the 24-satellite configuration, satellite positions similar to the nominal constellation are obtained (less than 4° average shift in argument of latitude) and have an improved performance according to at least two metrics, including the new one. This suggests that this approach will be useful for determining unique operationally realistic placement of satellites for other configurations.

Variable satellite placement in spoken Dutch

This article presents a corpus study of the variable placement of adverbial satellites in spoken Dutch. It is widely contended that the relative order of satellites is motivated by three general principles: information status, length and the proximity principle. The proximity principle maintains that the placement of satellites is motivated by their semantic relationship with the sentence verb. We investigated the effect of the proximity principle on the relative placement of 8 different satellite classes based on a corpus sample of 202 combinations of two satellites retrieved from the Corpus of Spoken Dutch. The exact binomial test was used to evaluate the statistical significance of the observed orders. Our main results corroborate the hypothesis that the proximity principle influences satellite ordering. We also found, however, that the placement of certain satellite classes appeared very restricted, which suggests that the proximity principle does not play an active role in their placement.

To the Far Side of the Sun Using Venus Gravity Assist

The recent NASA initiative to investigate our sun in depth, called Living with a Star, includes consideration of several possible deep-space missions, one of which is placing a satellite on the far side of the sun. Thissatellite, together with Earth, can then observe the full evolution of solar phenomena as the sun rotates. Unfortunately, in using a direct approach celestial mechanics does not permit satellite placement to be done efficiently and in a timely manner. Here, the direct approach for satellite placement is shown to be costly compared with the use of Venus gravity assist. This paper investigates specifically the insertion of a far-side sentinel satellite in the year 2009 into the third quadrant (180 to 270 deg ahead of Earth) using single and double Venus gravity assists. Options for other possible missions, including a distributed set of solar observers, are briefly analyzed.

Reusable Orbital Transfer Vehicle Applications of an Integrated Solar Upper Stage

There has been resurgent interest in the development of a reusable orbit transfer vehicle, based in lowEarth-orbit, for satellite placement, repositioning, recovery, and control. An integrated solar upper-stage system is examined for several near-Earth applications, including low-Earth to geosynchronous to lowEarth orbit ferrying. An integrated solar upper stage (a solar thermal power and propulsion system) permits rapid access to high orbits because of its moderate thrust levels (tens to hundreds of pounds) at specific impulses approaching 900 s, intermediate between high-performance chemical propulsion and electrical propulsion systems. An integrated solar upper-stage reusable orbit transfer vehicle can be used in two novel modes: 1) Drag return, in which large, rigid solar concentrators provide an aeroassist capability lowering total delta-V requirements; and 2) a hybridized integrated solar upper stage, coupled with and providing power to a xenon ion thruster, allowing more efficient maneuvers in nontime critical applications.

Crowded Skies: Issues in Asia-Pacific Satellite Development

From services by a sole provider of satellite communications little more than two decades ago, the Asia-Pacific is now inundated with existing and planned geostationary satellites. This article looks at, among other things, the regulations regarding placement of satellites in orbital positions; various satellite systems and their services in the Asia-Pacific region; and the problems facing those who intend to claim a slot in this geostationary ‘land rush’.

Energetic ion beam magnetosphere injection and solar power satellite transport

The effects of ion beam injection in the magnetosphere are considered. The beam's parameters are those characteristic of the ion propulsion engines envisioned for use in solar power satellite placement (Hanley and Guttman, 1978a). Specifically, from a detailed analysis of the beam's propagation through the magnetosphere it is shown that the bulk of the ion beam is not stopped in the magnetosphere. However, the relatively small fraction of the beam which is deposited via the beam's sheath loss may give rise to a large distortion in the magnetospheric plasma population. Possible loss mechanisms from the magnetosphere for this artificial energetic ion component are evaluated. Electron coulomb scattering yields the shortest lifetime throughout most of the plasmasphere provided that plasmasphere heating by beam ions is not too intense. Charge exchange dominates beyond the plasmasphere. The effects of pitch angle scattering due to beam ion turbulence may appreciably shorten beam ion lifetimes throughout the magnetosphere.