CHIPSat presentation

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Information about CHIPSat presentation
Education

Published on January 22, 2008

Author: Randolfo

Source: authorstream.com

CHIPSat:  CHIPSat Cosmic Hot Interstellar Plasma Spectrometer Spacecraft Julius-Maximilians-Universität Würzburg S: Telematik in der Raumfahrt Prof. Dr. Schilling 11/20/2003 Gerd Weiß Table of Contents:  Table of Contents A small Description Some technical Details Communication Architecture HDLC-Protocol Berkeley Ground System Chips Operation Result of using TCP/IP Small Description I:  Small Description I First Satellite in NASA´s University-class Explorer Program (UNEX) Spacecraft developed by SpaceDev Inc. Instrument developed at the Space Sciences Lab at UCB Launch on January 12th, 2003 from Vandenberg Air Force Base as a secondary payload on a Delta II booster Small Description II:  Small Description II Purpose of the research: to measure extreme ultraviolet emissions from the interstellar medium Conducted at SpaceDev, later at UCB/SSL Generated data volume ca. 16 MB/day Some Technical Details:  Some Technical Details Mass for entire satellite less than 64 kg Dual-junction GaAs/InP/Ge solar arrays with nickel Fiber cadmium batteries provide the power of 40W Singelboard flight computer (Motorola PowerPC 750 CPU) WindRiver VxWorks RTOS Communication Architecture:  Communication Architecture Onboard redundant asynchronous RS-422 links S-band transceiver for RF communications HDLC point-to-point link to ground station Standard TCP/UDP/IP protocol stack layered within HDLC frames HDLC - Protocol:  HDLC - Protocol Works on Layer 2 (OSI-Model) Variable Info length Backward error correction Support Sliding-Windows HDLC – frame: Ground System (U.C Berkeley):  Ground System (U.C Berkeley) 1999: operation center, satellite ground station established at U.C. Berkeley´s Space Sciences Laboratory - Mission Operation Center (MOC) - Science Operation Center (SOC) - Berkeley Ground Station (BGS) Serves three satellite missions FAST, RHESSI, CHIPS Mission Operation Center (MOC):  Mission Operation Center (MOC) Tasks: Mission planning Mission control Flight Dynamics Several software used like: SatTrack Suite for flight dynamics Integrated Test and Operation System (ITOS) for spacecraft command and control (used by HESSI and FAST Mission Planning System (MPS) for command load generation (used by FAST mission) Mission Control Center (MCC) MOC – SatTrack Suite:  MOC – SatTrack Suite Developed by Bester Tracking Systems, Inc. Some features: Pass Scheduling and Orbit Event Analysis Batch Mode and Interactive Mode    Client/Server Network Environment Message exchange in plain ASCII format MOC - ITOS :  MOC - ITOS Runs on one machine or a cluster of machines receives data and sends commands to and from the spacecraft interface over an IP Ethernet connection distribute data via an IP Ethernet to other systems attached to the local area network Developed by the Hammers Company Science Operation Center (SOC):  Science Operation Center (SOC) Tasks: Science data processing, archival, distribution, access, retrieval Hardware: Sun Microsystemes, Linux-based workstations, Servers, a full automated CD-ROM production system Berkeley Ground Station (BGS):  Berkeley Ground Station (BGS) 11-m parabolic reflector antenna Configuration completely automated Pre-pass station set-up begins 10 minutes prior to acquisition of Signal (AOS) Deconfiguration is completed 3 minutes after loss of signal (LOS) Automation of Satellite Contact:  Automation of Satellite Contact SatTrack Suite SatTrack/GS Monitor& Control System Ground Station ITOS Two-line Element Download twice per day Build Pass Schedules SOC Pass support request Pass support request 1. pre-pass Automation of Satellite Contact:  Automation of Satellite Contact SatTrack Suite SatTrack/GS Monitor& Control System Ground Station ITOS Two-line Element Download twice per day Build Pass Schedules SOC SENDPASSES FACILITY BERKELEY OBJECT RHESSI 2. pre-pass SENDPASSES FACILITY BERKELEY Automation of Satellite Contact:  Automation of Satellite Contact SatTrack Suite SatTrack/GS Monitor& Control System Ground Station ITOS Two-line Element Download twice per day Build Pass Schedules SOC incoming Object Corresponding time line of all events Configuration parameter 3. pre-pass read configuration file Start pre-pass configuration Automation of Satellite Contact:  Automation of Satellite Contact SatTrack Suite SatTrack/GS Monitor& Control System Ground Station ITOS Two-line Element Download twice per day Build Pass Schedules SOC 4. pre-pass Request for individual pass support Start pre-pass configuration Establish connection Automation of Satellite Contact:  Automation of Satellite Contact SatTrack Suite SatTrack/GS Monitor& Control System Ground Station ITOS Two-line Element Download twice per day Build Pass Schedules SOC 5. during pass record telemetry data Send commands Received Data Satellite Automation of Satellite Contact:  Automation of Satellite Contact SatTrack Suite SatTrack/GS Monitor& Control System Ground Station ITOS Two-line Element Download twice per day Build Pass Schedules SOC 6. post-pass recorded data spacecraft engineering data CHIPS Operation:  CHIPS Operation Command and control by Mission Control Center (MCC) software (replaced ITOS and MPS) Clients and Server connected via a VPN While in contact, the CHIPS spacecraft acts as another node on this network CHIPS utilizes telnet and ftp for data and file transfer Chipsat Data Flow:  Chipsat Data Flow INTERNET VPN VPN VPN LAN MCC server MCC client LAN MCC client LAN SpaceDev Router SpaceDev Router switch switch CHIPSat Security:  Security VPN with multiple Internet Protocol Security (IPSec) tunnels Firewalls are used Only pre-authorized computers have access Computers are password protected Written details of architecture secure Result of Using TCP/IP:  Result of Using TCP/IP Packets dropped during transmission are simply retransmitted  poor link margin result in a lower throughput, no data are lost Standard products provide TCP/IP  reducing the costs for systems Latency is not increased significantly

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