THEMIS Instrument PDR GSE-1 UCB, October 15-16, 2003

IDPU Ground Support EquipmentPreliminary Design Review

F. HarveyUniversity of California - Berkeley

THEMIS Instrument PDR GSE-2 UCB, October 15-16, 2003

Overview

GSE• Requirements• GSE Components• IDPU GSE• Traveling GSE• Calibration GSEs• “Gold Box” ETU board debug• GSE Interface Board• Defect Tracking• Schedule• Issues

THEMIS Instrument PDR GSE-3 UCB, October 15-16, 2003

Requirements

Evolving Roles• ETU Board debug: digital test signals, instrument TLM…• Instrument calibration: analog stimulus, fixtures…• Flight Board test• IDPU GSE: STOL/ITOS/Hashii

Requirements• Robust for travel• No data loss or corruption introduced by GSE• Able to create semi-realistic input conditions for tests• Flight grade electronic and mechanical interfaces.• Safety checks (like FSW) for HV and deployment.• Longevity

THEMIS Instrument PDR GSE-4 UCB, October 15-16, 2003

GSE Components

Commercial• GPIB-compatible power supplies• GPIB-compatible waveform generator• Firewire-compatible 333kSps ADC• 19” 6U VME subrack• Rugged traveling case• Altera Stratix / Nios computer• GSE computer

Locally designed and built components• GSE Interface Board, software and FPGA• Power supply connection to backplane• Motor, SMA, and load simulators.• Cabling

THEMIS Instrument PDR GSE-5 UCB, October 15-16, 2003

IDPU GSE

Properties• Spacecraft-like interface to IDPU, telemetry & power• User interface is modeled on Hashii/ITOS/STOL.• Provides digital test patterns for ESA & SST• Provides analog waveforms for instrument(s)

THEMIS Instrument PDR GSE-6 UCB, October 15-16, 2003

Traveling GSE

Properties• Robust enclosure• Supports full IDPU GSE abilities, board regression testing.• Does not easily support calibrations outside SSL.

THEMIS Instrument PDR GSE-7 UCB, October 15-16, 2003

Calibration GSEs

Properties• Major parts

– EFI “Boom Box”. 2 varieties, 2 copies each, 4 Meters long– Vacuum chamber and pumps– Ion gun– Manipulator– Manipulator controller

• References– Jim Lewis’ PDR PowerPoint talks on ESA & SST– J Bonnell’s paper “Themis EFI GSE Workstation Functional

Requirements”, 9/30/2003

THEMIS Instrument PDR GSE-8 UCB, October 15-16, 2003

“Gold Box” ETU board debug

Properties• Can supply digital “test patterns” for missing parts: FGE,

SST, ESA• Usually sends DUT’s telemetry to PC, not S/C telemetry.• Small VME backplane. Shares boards with larger GSEs.

THEMIS Instrument PDR GSE-9 UCB, October 15-16, 2003

GSE Interface Board

Overview• Altera Stratix Board, mounted as daughter board• 6U parent has simple non-FPGA circuits borrowed from

DCB design.• FPGA has CDI transmit / receive, test pattern generation,

TLM receive, UART, Spin Sync logic, S/C time circuit.• Tristate logic and 100 ohm resistors allow test patterns

when certain boards are missing.

THEMIS Instrument PDR GSE-10 UCB, October 15-16, 2003

Defect Tracking

NASA-compliant Defect Tracking• Themis PFR (Problem Failure Report)• Template file supplied with GSE software• Email front end. • Tracks suspected problems with Themis, FSW, GSE,

interface boards, ITOS, MOC…• Prioritized• Cognizant Engineer is always assigned to an entry (until it’s

resolved)• Mission Assurance Holds Original & Tracks to Closure

THEMIS Instrument PDR GSE-11 UCB, October 15-16, 2003

Schedule

GSE-related target dates• DFB breadboard 10/27/03 (no UCB GSE planned)• EFI boom calibration 11/03• PCB ETU 12/08• DCB ETU 12/15• ETC ETU 12/15• BEB (actel) ETU 1/2/04• FGE ETU 1/20/04 (no UCB GSE planned)• LVPS 1/23/04• IDPU ETU 4/13/04

THEMIS Instrument PDR GSE-12 UCB, October 15-16, 2003

Schedule

I&T Flow

IDPU F1 Assembly 1 wkIDPU F1 Functionals 1 wkIDPU F1 PROM Installation/Test 2 daysIDPU F1 Functionals 1 wkIDPU F1 Limited EMC 1 dayIDPU F1 Coat/Stake 3 daysIDPU F1 CPT 2 daysIDPU F1 Test Review 1 dayIDPU F1 Vibration 1 dayIDPU F1 Thermal Vacuum 5 days

THEMIS Instrument PDR GSE-13 UCB, October 15-16, 2003

Issues

Shared Facilities• Configuration control• Upstairs Vacuum chamber• Downstairs Vacuum chamber

Tight resources for building GSEs• Layout personnel• Technicians• FPGA engineers• GSE programmers