Subsystem Development. T&DF Development. LAT Flight Software Testbed. LAT Integration & Test. Mission Systems Integration & Test EGSE TKR EM1 LOF

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1 GLAST Technical Memorandum GTM023A From: Scott Williams To: G. Haller Date: 13 July 2001 Subject: Concept for Summary Description of the Electrical Ground Support Equipment () concept to support the development of the Large Area Telescope () for the Gamma-ray large Area Space Telescope (GLAST). 1 Electrical Ground Support Equipment The is being developed by the same team which will be producing the Instrument Operations Center (). This allows the development to be used to prototype functions and processes while supporting the electronics development team, the principal end user. The has a significant role in the operation of the instrument during integration and test to support operations team training. The will inherit the support functions in FY04. team familiarity with the will enhance the ability of the team to support maintenance of systems in the field. 2 Versions The hardware is released 6 times during development as shown in the last section on schedule. These releases include 4 separate configurations: Engineering Model 1, Engineering Model 2, Qualificaiton Unit, and Flight Unit. Function Rev Number support TEM Interface/WS 2 support TEM Interface/WS 6 Integration Testing TEM Interface/WS 2 SLAC DAQ H/W development EM2 SIS/WS/IPS 1 FSW Testbed EM2+ SIS/WS/IPS 1 Calibration/Qualification QU SIS/WS/IPS 1 Flight I&T FU SIS/WS/IPS 1 W. W. Hansen Experimental Physics Laboratory ffl Stanford University ffl Stanford, CA 94305

2 GTM023A Page 2 TKR CAL ACD Sims ACD TKR CAL T&DF EP GTM SIU AEM TEM T&DF EM2 / Interface GSE Interfaces GLAST GSE Interfaces GLAST Flight Interfaces Sims ACD TKR CAL S/C FSW Testbed S/C GSE Flight Software Testbed EM2 Integration & Test FU Mission Systems Integration & Test FU MOC SSC Large Area Telescope GSE Ground Support Equipment Electrical GSE Engineering Model 1 EM2 Engineering Model 2 FU Flight Unit QU Qualification/Calibration Unit AEM ACD Electronics Module EP Event Processor FSW Flight Software GTM Global Trigger Module Instrument Operations Center Operations Facility MOC Mission Operations Center S/C Spacecraft Science Analysis Software SSC Science Support Center Science Data Production SIU Spacecraft Interface Unit T&DF Trigger and Dataflow System TEM Tower Electronics Module Figure 1: Electrical Ground Support Equipment configurations 2.1 The first hardware release of the is to suport the development of the Tower Electronics Module (TEM). When the TEM is ready, it will be delivered to the subsystems to support sensor development. Each TEM delivered to a subsystem will come with : a PCI crate with 603e CPU, communications card, and a custom interface card to the TEM. The custom interface card will probably be a Xylinx FPGA with LVDS interface chips on it. It will handle data acquisition, possibly using a National LVDS serializer chip, and also simulate the global trigger. The E&DAQ group provides the custom interface card. The team buys the COTS PCI bus and 603e CPU. The CPU acquires data via the custom card from the TEM and exports the data over the ethernet. The incldues a Sun (or possibly Linux) workstation provides commanding, data acquisition, data archive, data display, and data distribution. It also has to support the 603e software development environment which is probably VxWorks with a license server at SLAC. A separate Sensor simulator card is being developed to provide a stimulus for the TEM in the absense of the actual sensor. This simulator is provided by the E&DAQ group. The current estimate of TEM/ systems and their distribution is listed below.

3 100Base-T 100Base-T RS232 GTM023A Page 3 s CAL NRL 2 ACD GSFC 1 TKR SLAC 1 Italy 1 UCSC 1 DAQ SLAC 1 HEPL 1 Integration I&T SLAC 2 (or simulator) TEM Legend Engineering Model CPU COM TEM I/F cpci T&DF Simulator Workstation Dual Home Ethetnet Internet Ethernet Router and Firewall Figure 2: Engineering Model 1 Electrical Ground Support Equipment configuration

4 100Base-T 100Base-T RS232 GSE Port (RS232) GTM023A Page EM2 EM2 is the first release of the complete Trigger and Dataflow (T&DF) system which supports multiple towers. EM2 will include a non-flight version of the data acquisition system including the Global Trigger, Event Processor and Spacecraft Interface Unit (SIU). The SIU will probably be a PCI based box with a 603e cpu, National 216 serializer for high speed science data, MIL-STD-1553 for command and housekeeping interface to the spacecraft Command and Data Handling system (C&DH). The then becomes a S/C Interface Simulator (SIS) which interfaces to the SIU and provides switched power, analog and discretes, serializer receiver, and 1553 master. This SIS is probably one of the previously purchased PCI crates with a 603e CPU, MIL-STD-1553, and COTS I/O card in it. The SIS provides the interface to the ethernet which then links to the Sun (Linux) support workstation. Paired with the SIS is an Instrument Power Supply (IPS) which provides VDC power under computer control. (or simulator) TEM Trigger & Data Flow System Legend Engineering Model GTM EP SIU Power Distribution System CPU COM 1553 SSR I/F I/O cpci Spacecraft Interface Simulator 28 VDC Instrument Power Supply Workstation Dual Home Ethetnet ENET-GPIB Controller Internet Ethernet Router and Firewall Figure 3: Engineering Model 2 Electrical Ground Support Equipment configuration

5 GTM023A Page Flight Software Testbed Once the EM2 T&DF is shown to work, the TEMs are replicated to develop a full, 16 module software testbed. The testbed will include an EM version of the SIU. Similarly, the SIS will be replicated so that the E&DAQ development team holds onto one for hardware development while the testbed gets the second to support software development. The testbed includes enough sensor simulators to exercise a full scale T&DF system with reasonable approximation to the expected orbital event rates. The workstation is provided with sufficient hard disk and tape backup capability toarchive testbed data. 2.4 Qualification and Calibration Units The next DAQ release is for the calibration/qualification towers. The T&DF system will include TEMs to support up to 4 tracker/calorimeter towers and one ACD, a Global Trigger, Event Processor, and an SIU. The system will run in parallel with the FSW testbed and so will need its own SIS, IPS, and workstations. It is highly probable that this system will need to travel with the Qual/Cal unit during environmental or beam testing. It will therefore include two workstations to provide a hot spare as well as to segment to commanding and data archive tasks from the data display and analysis tasks. 2.5 Flight Unit The Flight Unit T&DF will also operate in parallel with the Testbed and the Qual/Cal Unit resulting in the requirement for another set of. The -FU will include a SIS, IPS, and two workstations. 3 Schedule A preliminary deployment schedule is provided below. The 11/01 date will be difficult to support, however, I am fairly confident that the 3/02 date can be met for the subsystem deployment. Version Purpose Need Date DAQ development 11/01 Interface Versions 3/02 EM2 DAQ EM2 9/02 EM2 Flight Software Testbed 12/02 Qual Qualification Tower A support 4/03 Flight Flight Unit Integration Support 8/03

6 GTM023A Page 6 Legend Product Activity Interface Tests EM2 EM2 EM2 Interface Tests A Hardware Simulators B Qual Unit Qual Unit Calibration & Test Ground Sys Compatability Tests A Flight Unit I&T - Func, TV, Calibration and GSE Delivery Observatory Environmental Testing B FSW Testbed FSW Support Testbed V&V CMD, FSW, Param Uploads Figure 4: Electrical Ground Support Equipment development flow. 4 Software The software can be segmented into four primary components: ffl realtime system. ffl command and control software. ffl data acquisition, quality verification, archive, and distribution. ffl data visualization and analysis. The first area of support is for the realtime system which runs in the PCI crate or in the EM2, QU, and FU SIS crate. This software will probably run under the VxWorks operating system and will be responsible for acquiring data from the TEM or T&DF and sending commands to the TEM or T&DF. In the SIS the software will also service the COTS I/O board analogs and discretes which includes control signals to the SIU for power control. These systems are similar in complexity to the Balloon Interface Unit (BIU) flight software and will probably be developed from that system. The remaining software is resident on the workstations. The command and control software will probably be a COTS product with some tailoring. Candidates include OS/Comet, SCS21, SCL, and Epoch2000. The data acquisition and handling software may also be a COTS product, although it will require substantial tailoring for our applications. Each ofthe

7 GTM023A Page 7 previously mentioned system provide some data handling. Other candidates include SETS and datahub, both generated at Stanford. The data visualization and analysis software may well involve more than one COTS product. Candidates are Root, IDL, Matlab, and the above mentioned commercial products which also provides data displays.