A Distributed Network Architecture for PC-Based Telemetry Systems
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1 A Distributed Network Architecture for PC-Based Telemetry Systems by Paul A. Thoreson, Lockheed Martin Telemetry & Instrumentation Presented to Ground Systems Architectures Workshop February 26, 1997 frank:/550/gndsysws 2/97 p. 1
2 Objective: To describe a candidate software architecture for a satellite ground station with emphasis on telemetry processing, software component interfacing, and platform interoperability The described architecture is comprised of commercial off-the-shelf hardware and software components requiring a system integration to provide minor glueware or wrapper applications and software component upgrade synchronization frank:/550/gndsysws 2/97 p. 2
3 Hardware Architecture Overview Server Processor (Intel PC or UNIX Workstation) Analyst Console Analyst Console C O M M S E G M E N T Telemetry Front End (NeTstar) Fast Ethernet Switch Server (Intel PC Processor or UNIX Workstation) Analyst Console Analyst Console (Intel PC, VMS or UNIX Workstation) Analyst Console Fast Ethernet Switch Analyst Console WAN Telemetry Front End (NeTstar) Secure Router (Intel PC, VMS or UNIX Workstation) frank:/550/gndsysws 2/97 p. 3
4 NeTstar Block Diagram Pentium Processors Windows NT Client / Server Setup LAN / WAN / Ethernet Remote and Local Control RF and 70 MHz Receivers / Demodulators Telemetry Processing, Display, and Analysis Data Archiving and Playback Uplink Modulation / Commanding / Ranging 1553 Bus Testing Command Software Ranging and Receiver Displays CCSDS Processing & Display Third-Party Hardware / Software-Compatible frank:/550/gndsysws 2/97 p. 4
5 Hardware Components Telemetry Front End: NeTstar LMTI s Windows NT-based PC TFE Alternative TFE Any networked frame synchronized or decommutated data source Server Processor: Intel CPU-based personal computer running Windows NT Alternative Server DEC, SUN or SGI UNIX workstations frank:/550/gndsysws 2/97 p. 5
6 Hardware Components (Cont.) Analyst Station: Intel CPU-based personal computer running Windows NT Alternative Analyst Stations DEC, SUN, SGI, IBM and HP UNIX workstations and VMS workstations Local Area Network (Switched As Necessary) Fast Ethernet (100baseT) Alternative Networks Standard Ethernet (10BaseT), FDDI, or ATM frank:/550/gndsysws 2/97 p. 6
7 Software Architecture LAN (from TFE) LAN (to TFE) WAN/ Internet Software Instrumentation for Telemetry (SWIFT) Frame Command Write SWIFT Archive S/W Decom Algorithm Processor Data Web Applet Telemetry Processing PC / Console Disk or Tape SWIFT API Message Server Server PC Archives Databases Etc. To / From Planning, Scheduling, Orbit Analysis Consoles, etc. Requests COTS Analysis & Display Software Message Client Data Message Client Status Commands COTS Satellite Commanding Software Analyst PC Console Commanding Console frank:/550/gndsysws 2/97 p. 7
8 Software Architecture Core of telemetry processing and TFE interface is LMTI s Software Instrumentation for Telemetry (SWIFT) SWIFT derived from System 500 application software and entails telemetry decommutation, data archival and retrieval, database functions, algorithmic processing of TLM data and data distribution Frame & Command Write needed to format data from/to TFE (not required for LMTI TFEs) frank:/550/gndsysws 2/97 p. 8
9 Software Architecture (Cont.) SWIFT s Application Programmer Interface (API) used to connect SWIFT s data services to software bus Architecture utilizes COTS/GOTS software packages for software bus, data visualization, mission planning, database management, scheduling, orbit analysis, etc. WAN/Internet access of telemetry data available if desired/allowed frank:/550/gndsysws 2/97 p. 9
10 Telemetry Processing SWIFT Logical Front End #1 Virtual FPP #1 LAN Frame Decom Algorithm #1 Word 1. Alg. 1 Word 1. Alg. N Word N EADS Embedded Asynchronous Data Stream VFPP Time Algorithm Word N Decom Algorithm #2 Alg. 1 Word 1. Alg. N Word N Word 1. Word N G A T H E R API I/F for data to the requesting process frank:/550/gndsysws 2/97 p. 10
11 Telemetry Processing Frame glueware provides SWIFT with time-tagged raw (frame-synched) or decommutated data Major SWIFT element called Virtual Field Programmable Processor (VFPP) provides decommutation (if needed), format switching algorithmic processing (i.e., limit checking, EU conversion, derived measurements, etc.), data compression and formatting of data prior to distribution to S/W bus frank:/550/gndsysws 2/97 p. 11
12 Telemetry Processing (Cont.) Logical Front-End (LFE) encapsulates functionality (database setup) of one or more VFPPs Application Programmer I/F (API) package allows bi-directional data transfers to/from VFPP Each instance of SWIFT accommodates 64K uniquely-tagged measurands (raw telemetry, EU-converted data, etc.) Multiple instances of SWIFT can be active on single workstation providing unlimited tag space frank:/550/gndsysws 2/97 p. 12
13 Telemetry Processing, (cont d.) SWIFT (1st Instance) Logical Front End #1 VFPP #1 VFPP #2 PC CPU #1 LAN Frame S/W Decom Algorithm Processor Algorithm Processor Data Requesting Software Package(s) Logical Front End #2 VFPP #3 PC CPU #2 S/W Decom Algorithm Processor Data SWIFT (2nd Instance) Logical Front End #1 VFPP #1 PC CPU #3 S/W Decom Algorithm Processor Data frank:/550/gndsysws 2/97 p. 13
14 Telemetry Processing (Cont.) Multiple instances of Logical Front Ends (LFEs) in an instance of SWIFT allow independent satellite contact supports (both real-time & playback) Multiple Virtual FPPs in an instance of an LFE allows logical separation of embedded asynchronous data stream processing or multi- level packet processing tasks LFEs or VFPPs can be assigned to specific workstation CPUs to provide for CPU load balancing frank:/550/gndsysws 2/97 p. 14
15 Telemetry Processing Playback & Real Time Logical Front End #1 VFPP #1 Networked Archive File S/W Decom Logical Front End #2 VFPP #1 Algorithm Processor Data Server PC Middleware LAN Frame S/W Decom Algorithm Processor Data frank:/550/gndsysws 2/97 p. 15
16 Telemetry Processing Playback & Real Time Multiple Logical Front Ends (LFEs) allow simultaneous processing of playback and real-time data Enables trend analysis and measurement comparisons concurrent with real-time operations Post-analysis tools augmented with VFPP algorithm library VFPP algorithm library can be enhanced by system integrator or system operator using SWIFT s Algorithm Development Software frank:/550/gndsysws 2/97 p. 16
17 Software Bus Interface LAN LAN Frame Command Write SWIFT S/W Decom Algorithm Processor Server PC / Workstation API API Message Server Data Telemetry Processing PC / Console API Message Client Message Client API Visualization Software Commanding Software Analyst PC / Workstation Commanding PC / Workstation frank:/550/gndsysws 2/97 p. 17
18 Software Bus Interface SWIFT s Applications Programmer Interface (API) supplies data from/to telemetry processor to/from external S/W processes Software bus is selected by system integrator to fit the mission s unique cost/performance requirements SWIFT s API can be used as a s/w bus for real- time ground station applications (i.e., telemetry, commanding, & data visualization frank:/550/gndsysws 2/97 p. 18
19 Relational Database Interface RDBMS Oracle Sybase Etc. API Parameter Exchange To TFE for hardware setup RDBMS ASCII Export ASCII Translator SWIFT ASCII Import SWIFT DB Compiler SWIFT S/W Decom RDBMS ASCII Export ASCII Translator SWIFT ASCII Export SWIFT Database HMI Algorithm Processor Data frank:/550/gndsysws 2/97 p. 19
20 Relational Database Interface SWIFT s API includes Parm Exchange utility Parm Exchange imports/exports ASCII flat files compatible with SWIFT database compiler Database management can occur exclusively in RDBMS or using a combination of RDBMS plus SWIFT s database HMI ASCII hardware setups included in SWIFT s API if using LMTI Front-End frank:/550/gndsysws 2/97 p. 20
21 Satellite Commanding Downlink Privacy Unit Control Privacy Unit IRIG Time Cmd Echo Command IRIG TCT/C RS-232 PCI Decom PCI Telemetry I/O Module Commands SWIFT Telemetry Processing PC S/W Decom Algorithm Processor Data Commands & H/W Directives Satellite SOH & H/W Status SWIFT API Server PC Message Server Message Client H/W & Satellite Commands SOH & Status Commanding Software Commanding Console frank:/550/gndsysws 2/97 p. 21
22 Satellite Commanding NeTstar or similar TFE for commanding hardware interfaces SWIFT performs satellite SOH downlink processing, command echo processing, command formatting (if needed), and time- critical command releases Any COTS, GOTS, or in-house commanding software package can be tailored for use frank:/550/gndsysws 2/97 p. 22
23 Internet Data Service (Monitor Only) LAN Frame SWIFT S/W Decom Parameter List, Display, & CVT Data Web Browser Java Displays Algorithm Processor WAN/ Internet Parameter Selection Data Web Applet Parameter Selections frank:/550/gndsysws 2/97 p. 23
24 WAN/Internet Data Service Remote users have access to telemetry data via SWIFT s Web applet Compatible with Netscape s or Microsoft s Internet Explorer browser Web applet exports parameter list and Java displays Security issues may preclude use in all cases frank:/550/gndsysws 2/97 p. 24
25 Summary Software/hardware architecture capable of exploiting 3rd-party TFEs, PC, or UNIX workstations, COTS software buses, COTS/GOTS commanding packages, COTS data visualization packages, etc. Provides flexible telemetry processing capabilities including frame-synched or decommutated data, multiple simultaneous contacts and concurrent post-analysis Convenient ground station configuration management with ASCII database interface frank:/550/gndsysws 2/97 p. 25
26 Summary (Cont.) Time-critical commanding capability retained in combined SWIFT and NeTstar (or similar) TFE hardware Internet access of decommutated/processed telemetry data supported Architecture populated with low-cost, small COTS software and hardware products as selected by system integrator (SI) frank:/550/gndsysws 2/97 p. 26
27 Summary (Cont.) A true COTS product architecture allows SIs to receive product improvements funded by multiple sources and to quickly tailor products to meet specific applications without the direct and expensive efforts of the component vendors themselves frank:/550/gndsysws 2/97 p. 27
28 Questions/Comments If you have any questions or comments, please me at Thank you for your time. frank:/550/gndsysws 2/97 p. 28
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