Antenna Pointing System: Organization and Performance

Githens, J. A.; Kelly, H. P.; Lozier, J. C.; Lundstrom, A. A.

doi:10.1002/j.1538-7305.1963.tb04032.x

Cited by 11 publications

(1 citation statement)

References 10 publications

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“…Zhang et al 8 propose a pointing error analytical model to estimate the pointing error caused by deformation of the antenna structure. A number of other researches dealing with the same subject have been done and are detailed in their papers 9–11 …”

Section: Introductionmentioning

confidence: 99%

Analysis of the communication links between the AlSat‐1b satellite and the ground station: The impact of the Auto Tracking system on antenna pointing accuracy

Saiah¹,

Bensikaddour²,

Kaddouri³

et al. 2021

Satell Commun Network

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Summary The communication links between a satellite and the Earth station (ES) are exposed to many impairments such as noise, rain, and atmospheric attenuations. They are also prone to loss such as those resulting from antenna pointing and polarization. The Algerian Earth Observation satellite AlSat‐1b is designed to accomplish its mission in S‐band (Telecommands and Telemetry) and X‐band (images) frequencies in low Earth orbit (LEO). The ground segment (GS) of this satellite, situated in Oran, Algeria, is based on the X/Y antenna mounting system with 7.3‐m dish diameter. This large reflector can cause antenna pointing errors. The Antenna Control Unit (ACU) implemented in this station can be configured with or without an AutoTrack system. In this work, operational tests and analysis of the different communication links between AlSat‐1b and the ground station are presented. The obtained results clearly show that the quality of the S‐band links can reliably and efficiently satisfy the requirements without the use of the AutoTrack. On the contrary, the use of AutoTrack is necessary in order to obtain an improved level of link quality in the X band.

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Section: Introductionmentioning

confidence: 99%

Analysis of the communication links between the AlSat‐1b satellite and the ground station: The impact of the Auto Tracking system on antenna pointing accuracy

Saiah¹,

Bensikaddour²,

Kaddouri³

et al. 2021

Satell Commun Network

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Phase-Lock Loop Design for Coherent Angle-Error Detection in the Telstar Satellite Tracking System

Nelson¹

1963

Bell System Technical Journal

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The function of the angle‐error detector is to provide pointing‐error signals to the ground antenna control system, which allows operation in the autotrack mode once the satellite beacon has been acquired. The limitations on the accuracy of this system imposed by noise, phase jitter and Doppler effects are evaluated, and the optimum design in terms of minimum mean‐square error is developed. Design examples are given for both the horn‐reflector antenna autotrack system and the precision tracker antenna system.

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Command and Telemetry Systems

Chapman

Critchlow²,

Mann³

1963

Bell System Technical Journal

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The command and telemetry portions of the Telstar system provide necessary support functions for the basic communications experiment and the radiation experiment. By means of the command system, the stales of 9 magnetic latching relays in the satellite are controlled from the ground. Commands are sent to the satellite by coded signals modulated on a carrier in the VHF band. The telemetry system also uses a VHF carrier to transmit encoded information from the satellite. Data on 112 items are provided once each minute. This paper discusses the over‐all command and telemetry systems and considers the general objectives, system aspects and detailed implementation.

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Antenna Pointing System: Organization and Performance

Cited by 11 publications

References 10 publications

Analysis of the communication links between the AlSat‐1b satellite and the ground station: The impact of the Auto Tracking system on antenna pointing accuracy

Analysis of the communication links between the AlSat‐1b satellite and the ground station: The impact of the Auto Tracking system on antenna pointing accuracy

Phase-Lock Loop Design for Coherent Angle-Error Detection in the Telstar Satellite Tracking System

Command and Telemetry Systems

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