Novel digital platform for deep space transponders: the transmitter side

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI:10.1109/AERO.2004.1367920

Lorenzo Simone, D. Gelfiisa, S. Cocchi, M. C. Comparini, D. Fiore, V. Piloni, A. Rapposelli, M. Capannolo

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引用次数: 2

Abstract

Aim of the paper is to present a novel digital platform for the transmitting side (NDP-Tx) of a deep space transponder which has been developed by Alenia Spazio in the frame of the ESA study on "Digital Techniques for TT&C Transponder". The proposed design has unique features in terms of flexibility and interfacing with the spacecraft command data sub-system (CDS). The NDP-Tx supports standard telemetry modulation formats based on residual carrier and more advanced schemes aiming to improve the space-to-earth link performance. In fact, in case of limited available power, as for satellite transmitters, the power efficiency is maximised driving the power amplifier in saturation, i.e. in the non-linear region of its transfer characteristic. Using constant (i.e. GMSK) or quasi-constant (i.e. Square-Root Raised Cosine SRRC-Filtered OQPSK) envelope modulation allows the transmitter stage to operate in saturation without the drawback of the non-linear distortion (i.e. adjacent channel interference due to sidelobes spreading and regeneration).

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新型深空应答器数字平台:发射机侧

本文的目的是介绍一种新的深空应答器发射侧(NDP-Tx)数字平台，该平台是由Alenia Spazio在欧空局“TT&C应答器数字技术”研究框架下开发的。所提出的设计在灵活性和与航天器指挥数据子系统(CDS)的接口方面具有独特的特点。NDP-Tx支持基于剩余载波的标准遥测调制格式和更先进的方案，旨在提高空对地链路性能。实际上，在可用功率有限的情况下，对于卫星发射机来说，驱动功率放大器的功率效率最大化是在饱和状态下，即在其传输特性的非线性区域。使用常数(即GMSK)或准常数(即平方根提高余弦srrc滤波OQPSK)包络调制允许发射机级在饱和状态下工作，而没有非线性失真的缺点(即由于副瓣扩展和再生而引起的相邻信道干扰)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)

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