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首页> 外文期刊>Space technology >A NANOSATELLITE TO DEMONSTRATE GPS OCEANOGRAPHY REFLECTOMETRY
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A NANOSATELLITE TO DEMONSTRATE GPS OCEANOGRAPHY REFLECTOMETRY

机译：纳米卫星演示GPS海洋学反射法

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This paper describes a proposal for a rapid, low cost, nanosatellite mission to demonstrate the concept of GPS ocean reflectometry and to investigate the feasibility of determining sea state for a future operational space-based storm warning systems. The aims of this mission are to prove the general feasibility of GPS ocean reflectometry, to demonstrate sea state determination and to enable the development of a practical GPS ocean reflectometry payload for future missions. The payloads on the satellite consist of a 24 channel C/A code SGR-10 space GPS receiver and a solid-state data recorder. The GPS receiver has one standard RHCP zenith antenna, and one high gain Left Hand Circular Polarised (LHCP) nadir antenna for receiving the reflected signals. A dual approach is taken to measurement gathering. Initially, bursts of directly sampled IF data are stored and downloaded to pen-nit processing of the data on the ground. Later in the mission, the GPS receiver software may be modified to permit the processing of signals on-board the satellite. The nanosatellite is based on Surrey Satellite Technology's (SSTL) SNAP design and has a projected total mass of around 12 kg; orbit average power of approximately 4.8 W; three-axis attitude control of 1-2°; VHF uplink, S-band downlink at 500 kbps, and on-board computer (OBC) based on the StrongARM SA1100. Using the SSTL Nanosatellite Applications Platform (SNAP) design enables a fast manufacture at low cost: estimated at 9 months and around 2 million Euros, including launch. The proposed mission makes use of the Surrey Space Centre Mission Control ground station in Guildford (UK) for control and data gathering. Surrey Satellite Technology (SSTL) is a world leader in both nanosatellite and GPS technology for small satellites. Surrey Satellite Technology's highly successful SNAP-1 nanosatellite launched in June 2000 demonstrated the potential of such small spacecraft, and this proposal involves the first ever use of a nanosatellite for a commercial application (GANDER) in collaboration with SOS (UK), a company specialising in oceanography from space.
机译：本文介绍了一项快速，低成本，纳米卫星任务的建议，以演示GPS海洋反射法的概念，并研究确定未来海空预警风暴系统的海况的可行性。该任务的目的是证明GPS海洋反射法的一般可行性，演示海况确定并为将来的任务开发实用的GPS海洋反射法有效载荷。卫星上的有效载荷包括一个24通道C / A码SGR-10空间GPS接收器和一个固态数据记录器。 GPS接收器有一根标准的RHCP天顶天线和一根高增益左旋圆极化（LHCP）天底天线，用于接收反射信号。采取双重方法进行度量收集。最初，直接采样的IF数据的脉冲串被存储并下载，以便在地面上对数据进行笔式处理。在任务的后期，可以修改GPS接收器软件以允许处理卫星上的信号。纳米卫星基于萨里卫星技术（SSTL）SNAP设计，预计总质量约为12千克；轨道平均功率约为4.8 W； 1-2°的三轴姿态控制； VHF上行链路，500 kbps的S波段下行链路以及基于StrongARM SA1100的车载计算机（OBC）。使用SSTL纳米卫星应用平台（SNAP）设计可实现低成本快速制造：估计需要9个月的时间，包括发射大约需要200万欧元。拟议的飞行任务利用英国吉尔福德的萨里航天中心飞行任务控制地面站进行控制和数据收集。萨里卫星技术（SSTL）在小卫星的纳米卫星和GPS技术方面均处于世界领先地位。萨里卫星技术公司（Surrey Satellite Technology）于2000年6月发射的非常成功的SNAP-1纳米卫星证明了这种小型航天器的潜力，该提案涉及与SOS（UK）合作的首次将纳米卫星用于商业应用（GANDER），这是一家专业公司在太空中进行海洋学研究

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