East–West GEO Satellite Station-Keeping with Degraded Thruster Response

Borissov, Stoian; Wu, Yunhe; Mortari, Daniele

doi:10.3390/aerospace2040581

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…This is due to gravitational forces caused by earth longitudinal mass variations (for instance, satellites with longitudes from 0 • to 60 • East, slowly drift eastwards toward the Indian Ocean), and this sums up to the effect of orbit inclination. These perturbations are periodically counteracted by the satellite operator via orbit correction maneuvers, termed "station-keeping": "East-West" and "North-South" station-keeping maneuvers compensate for longitudinal and latitudinal variations, respectively [31]. Thus, even if the GS antenna is correctly pointing towards the satellite nominal position, its actual gain in the link budget undergoes continuous fluctuations caused by the satellite movements, thus producing the nearly-periodic daily variations of signal strength visible in Figure 3, along with a slow decay associated to the longitudinal drift.…”

Section: Antenna Mispointing and Orbit Perturbationsmentioning

confidence: 99%

Opportunistic Rain Rate Estimation from Measurements of Satellite Downlink Attenuation: A Survey

Giannetti

Reggiannini

2021

Sensors

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Recent years have witnessed a growing interest in techniques and systems for rainfall surveillance on regional scale, with increasingly stringent requirements in terms of the following: (i) accuracy of rainfall rate measurements, (ii) adequate density of sensors over the territory, (iii) space-time continuity and completeness of data and (iv) capability to elaborate rainfall maps in near real time. The devices deployed to monitor the precipitation fields are traditionally networks of rain gauges distributed throughout the territory, along with weather radars and satellite remote sensors operating in the optical or infrared band, none of which, however, are suitable for full compliance to all of the requirements cited above. More recently, a different approach to rain rate estimation techniques has been proposed and investigated, based on the measurement of the attenuation induced by rain on signals of pre-existing radio networks either in terrestrial links, e.g., the backhaul connections in cellular networks, or in satellite-to-earth links and, among the latter, notably those between geostationary broadcast satellites and domestic subscriber terminals in the Ku and Ka bands. Knowledge of the above rain-induced attenuation permits the retrieval of the corresponding rain intensity provided that a number of meteorological and geometric parameters are known and ultimately permits estimating the rain rate locally at the receiver site. In this survey paper, we specifically focus on such a type of “opportunistic” systems for rain field monitoring, which appear very promising in view of the wide diffusion over the territory of low-cost domestic terminals for the reception of satellite signals, prospectively allowing for a considerable geographical capillarity in the distribution of sensors, at least in more densely populated areas. The purpose of the paper is to present a broad albeit synthetic overview of the numerous issues inherent in the above rain monitoring approach, along with a number of solutions and algorithms proposed in the literature in recent years, and ultimately to provide an exhaustive account of the current state of the art. Initially, the main relevant aspects of the satellite link are reviewed, including those related to satellite dynamics, frequency bands, signal formats, propagation channel and radio link geometry, all of which have a role in rainfall rate estimation algorithms. We discuss the impact of all these factors on rain estimation accuracy while also highlighting the substantial differences inherent in this approach in comparison with traditional rain monitoring techniques. We also review the basic formulas relating rain rate intensity to a variation of the received signal level or of the signal-to-noise ratio. Furthermore, we present a comprehensive literature survey of the main research issues for the aforementioned scenario and provide a brief outline of the algorithms proposed for their solution, highlighting their points of strength and weakness. The paper includes an extensive list of bibliographic references from which the material presented herein was taken.

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Section: Antenna Mispointing and Orbit Perturbationsmentioning

confidence: 99%

Opportunistic Rain Rate Estimation from Measurements of Satellite Downlink Attenuation: A Survey

Giannetti

Reggiannini

2021

Sensors

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“…Station keeping maneuver should be performed to maintain the satellite longitude and latitude around the nominal point within specified limits called control box (station keeping window) [1]. The components of thruster force via the spacecraft three axis can be concluded from…”

Section: Station Keeping Requirementsmentioning

confidence: 99%

“…The Communication satellites in geostationary orbit are subjected to several natural perturbations, which can affect the required position of satellite. For this purpose, station keeping (SK) maneuvers are periodically performed using the propulsion system in order to correct the orbit drift and maintain the satellite in its control box [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Bang-Bang Attitude Control During East-West Station Keeping For Geostationary Satellite

Benfriha

2021

AJSS

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This paper investigates the East-West station keeping strategy of geostationary satellites which must be performed to correct the drift caused by natural perturbation forces. The attitude control requirements as well as the pointing accuracy must be maintained during the station-keeping maneuver in order to assure the mission services. The propulsion system (chemical thrusters) is used to control both the orbit control (station keeping) and the attitude control where the ON/OFF thrusters pulses are managed using Bang-Bang controller with dead-band technique. Simulation results can clearly illustrate the feasibility and the effectiveness of the proposed control strategy.

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“…More information regarding the roles of the earth's gravitational forces, third body (Moon and Sun) effects, trajectory or drifting pattern can be found in [7], [8]. In [7] authors explain that for a GEO satellite, periodically station keeping maneuvers need to be performed to correct the satellite position. This procedure uses resources like fuel, which essentially reduces the lifetime of the satellite.…”

mentioning

confidence: 99%

Interference Localization On-Board the Satellite Using Drift Induced Virtual Array

Arora

Maleki

Shankar

et al. 2018

2018 International Conference on Signal Processing and Communications (SPCOM)

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Herein, we investigate the interference received from other wireless networks into a satellite communication (SATCOM) link, and review approaches to identify the interference location using on-board satellite processing. Interference is an increasing problem for satellite communication links, and while receiving signals from gateways or user terminals, the uplink is prone to disturbance by interference due to jammers or unintentional transmissions. In this paper, our aim is to localize unknown interference sources present on the ground by estimating direction of arrival (DOA) information using onboard processing (OBP) in the satellite, and the satellite drift inducing a virtual array. In this work, the signal sampled by the drifting single antenna feed is modeled as using an arbitrary array. Building on this model, we perform the 2-D DOA (azimuth and elevation) estimation. The key challenges in such a design include single snapshot based DOA estimation with low complexity and robustness, arising out of limited on-board computational complexity as well as uncertainty in parameters like the drift speed. Employing realistic satellite drift patterns, the paper illustrates the performance of the proposed technique highlighting the accuracy in localization under adverse environments. We provide numerical simulations to show the effectiveness of our methodology.

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East–West GEO Satellite Station-Keeping with Degraded Thruster Response

Cited by 7 publications

References 8 publications

Opportunistic Rain Rate Estimation from Measurements of Satellite Downlink Attenuation: A Survey

Opportunistic Rain Rate Estimation from Measurements of Satellite Downlink Attenuation: A Survey

Bang-Bang Attitude Control During East-West Station Keeping For Geostationary Satellite

Interference Localization On-Board the Satellite Using Drift Induced Virtual Array

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