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BACK TITLE In orbit satellite Gain frequency response in band measurement new method AUTHOR Laurence CAGNAC IOT Manager and AIV system manager COMPANY Alcatel Space 26 avenue J-F Champollion B.P. 1187 31 037 Toulouse Cedex 1 E-Mail : Laurence.Cagnac@space.alcatel.fr ABSTRACT The main objective of the In Orbit Test (IOT) is to demonstrate that the satellite performances have not been degraded during the launch and transfer orbit operations and therefore the extensive test results obtained on ground are still valid. The tests relative to the communication payload have to be performed when the satellite is in its specified window, and at its specified orbital location. Nevertheless, IOT conditions are different from on ground tests conditions so that performances are sometimes difficult to compare. In particular the relative motion of the spacecraft with respect to earth station may disturb measurement requiring good stability such as the gain flatness within the transponder bandwidth. This paper describes the new method for measuring the gain frequency response IOT. A comparison with conventional methods of gain frequency response is made and shows a clear improvement. The new gain frequency response method permits to eliminate the fluctuation due to the motion of the satellite, and also the impairments due to the propagation in the atmosphere. -1-
1. INTRODUCTION The gain versus frequency measurement allows to check the flatness of the frequency response in the channel bandwidth. It consists basically in sweeping the channel bandwidth by even frequency steps and measuring the gain for each of these steps. The functional test combined with the various configurations of the payload channel allows to verify the good operating of nominal and redundant equipment. This requirement is checked for each Receiving chain, and for each Transmit chain. This test is done in Fixed Gain Mode (FGM) with sufficient TWTA input back off (IBO) so as to be in linear condition. 2. CONVENTIONAL METHOD 2.1 Measurement processing This measurement is performed at small input power (close to 10 dB IBO) in FGM mode to ensure that the TWTA’s work in linear mode. First, the uplink carrier is set at its specified input power and at Channel center frequency (CCF). The level tuning is made with a power meter (PM) and takes into account the calibration factor of the relevant frequency. For each frequency step, the input power level and output power level is measured with a spectrum analyzer (ASA). Gain value is determined by subtracting output level from input level. Figure 1 and Figure 2 provide the results of a measurement of a channel with SAW filter. The following parameters are applicable : • Frequency range: channel bandwidth (2.7 MHz) and out of band (± 0.6 MHz), • Frequency step: 100 kHz. -2-
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SÉANCE D'OUVERTURE / OPENING SESSI
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A l’aube de ce siècle, Airbus s
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BACK MANAGEMENT DES ESSAIS SYSTEME
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BACK ESSAIS D’ENSEMBLE LANCEURS C
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Elle ne doit cependant pas être me
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- le plan de mesures est conséquen
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4.2 MAQUETTE DYNAMIQUE ARIANE 5 Dan
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Les points délicats liés à l’o
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Processus Commande Architecture Int
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BACK 1 Introduction AIRBUS AIRCRAFT
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So, different test tools shall be d
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3.4 Architecture of A380 Simulators
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GENERAL PRESENTATION OF JUZZLE GENE
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IMPLEMENTATION AND SIMULATION OF A
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REFERENCES [1] Space engineering, R
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RÉSUMÉ: Osiris est une gamme de m
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1. INTRODUCTION Dassault Aviation e
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INTRODUCTION Pour définir des proc
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− The second level provides all d
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• Test duration is reduced : for
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mimics from CCS ones. The objective
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1. Introduction ...................
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2. Présentation Le segment sol Ste
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AUS Station STA TM/TC Station STS T
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Id Nom flux EXP37 Plan de vol Annex
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TTC’2003 Stentor 10/06/2003 QUALI
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mechanism. In a system where a late
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0 X Y X' Y' 0 X Y Sampling Cycle X
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GLOSSARY AFDX Avionics Full DupleX
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Figure 1: Real-time pen tip display
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Technique COFDM : La modulation COF
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ETCC'2003 European Test and Telemet
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amplitude (dB) 10 0 -10 -20 -30 -40
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amplitude (dB) 10 0 -10 -20 -30 -40
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UNIT Unit EMC documents : - groundi
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At equipment level EMC TEST PROGRAM
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comprenant des objets complexes, n
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PRESENTATIONS POSTER / POSTER PRESE
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BACK LA TELEMESURE SUR AIRBUS JC GH
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Dans le cycle d ’essais en vol ,
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LOGICIELS DE MESURE ET DE TRAITEMEN
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In order to optimize the phase nois
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Photo-oscillator active device Opti
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the inverse of N×N correlation mat
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quasi-synchronous multiuser detecto
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Multiuser Interference Canceler ”
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the inverse of N×N correlation mat
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quasi-synchronous multiuser detecto
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Multiuser Interference Canceler ”
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All these sub-systems can be easily
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3.5 ACPR RACK Gateway and satellite
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4.2 COMPONENT DEGRADATION MEASUREME
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Indeed, when the objective of the t
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Page 436 and 437: PARAMETER DESCRIPTION This array de
Page 438 and 439: BACK UTILISATION de CAMERAS NUMERIQ
Page 440 and 441: TABLE DES MATIÈRES 1. INTRODUCTION
Page 442 and 443: 2. CONTEXTE DES ESSAIS Le but des e
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Page 458 and 459: BACK F. Mailly et Al. ETTC 2003 MIC
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Page 480 and 481: BACK Abstract European Telemetry St
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Page 484 and 485: BACK The statistical Evaluation Of
Page 486 and 487: BACK Abstract Vendor Independent Da
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