U.S. AIR FORCE

ELECTRON LOSSES ANDFIELDS INVESTIGATION

1

Ground Support EquipmentMission PDR

Michael Anderson

Los Angeles, CaliforniaFebruary 12, 2015

U.S. AIR FORCE

Major Campaigns to Support

Notable Requirements

GSE-Spacecraft Interface

GSE Practices

Specific I&T GSE

2

GSE AGENDA

U.S. AIR FORCE

3

SUPPORTING ELFIN… EVERY STEP OF THE WAY

U.S. AIR FORCE

1. Full Development Model Tests

2. Mass Model Vibration

3. Instrument-Level Qualification TVAC

4. Internal Power Deployment Tests

5. EM Qualification TVAC

6. EM Qualification Vibe

7. Instrument-Level Acceptance TVAC

8. FM Acceptance Vibe

9. FM Acceptance TVAC

. . . And all intermediate assembly efforts!

4

MAJOR CAMPAIGNSTO SUPPORT

U.S. AIR FORCE

5

NOTABLE REQUIREMENTS

REQ ID Requirement Rationale Parent(s) Verification Method

GSE‐04

Electrical Ground Support Equipment shall be capable of supporting functional testing of the satellite, including subsystem level and full “day in the life” testing.

For verifying functional requirements

UNP‐NS8‐Userguide_IR (UNP 16)

I: by design

GSE‐06Electrical Ground Support Equipment shall be capable of command and control of the satellite without free radiation of RF energy.

For functionaility tests involving magnetic cleanliness

UNP‐NS8‐Userguide_IR (UNP 18)

I: by design

GSE‐07Electrical Ground Support Equipment shall be capable of command and control of the satellite through radios and RF.

For testing communications functionaility

UNP‐NS8‐Userguide_IR (UNP 19)

I: by design

Notable EGSE Requirements: Covered at Systems Requirements Review

Modifications in Future: Better definition of MGSE requirements, apply magnetic

requirements Add EGSE requirements for thermocouples

U.S. AIR FORCE

32 pins required for EGSE-Spacecraft interface: 8 pins: FCPCBs (Remove Access Cable) 2 pins: SBPCB1 SI-5 2 pins: SBPCB2 SI-5 4 pins: FCPCB MM I2C 4 pins: PPCB MM I2C 2 pins: IDPU GPIO 8 pins: BATT direct connections 2 pins: Inhibit actuation

Micro-D connector of TBD size Comes in 37, 51, 100 pin configuration

1 UART line to FCPCB, 1 to Radio Radio bypass to satisfy GSE-06

6

EGSE-SPACECRAFT INTERFACE

U.S. AIR FORCE

Safe-to-mates part of all relevant test procedures

Breakpoints in major GSE cabling to support TVAC and other tests

Time allocated in schedule for bakeout of TVAC EGSE

7

GSE PRACTICES

REQ ID Requirement Rationale Parent(s) Verification Method

GSE‐23

All Electrical Ground Support Equipment connectors that interface with flight hardware shall be designed, built, and controlled in a manner commensurate with flight hardware with the exception of cleanliness and, therefore, shall meet applicable requirements for configuration control, quality assurance, parts & materials, etc.

Keep EGSE at similar quality of flight hardware ‐to protect the flight hardware

UNP‐NS8‐Userguide_IR (UNP 35)

I: by design

ELECTRICAL GSE

U.S. AIR FORCE

8

GSE PRACTICESMECHANICAL GSE MGSE support structures must be vacuum safe

To be machined out of aluminum, Delrin, or PEEK

Protective covers for all instruments, optical sensors

Modeling tools in SolidWorks before assembly procedures attempted Verify assembly order is viable

MGSE to be colored or anodized red whenever possible

U.S. AIR FORCE

Simulated Sunlight Basic light sources for

functional testing Potential performance

testing in solar simulator at Aerospace Corporation

RF Dummy Load Radio testing with limited

radiated power

9

SPECIFIC I&T GSE

U.S. AIR FORCE

P-POD analog borrowed from Cal Poly Fit checks of engineering, flight models Fixture for vehicle vibration campaigns

10

SPECIFIC I&T GSE

U.S. AIR FORCE

11

SPECIFIC I&T GSE Vehicle assembly to be conducted on sled

Separate grounding cable rather than passively grounding through sled; desirable for functional checks of EPD

Roll cage attachment for movement, accessing different sides

U.S. AIR FORCE

Stacer Cradle Assembly Stacer not designed to support itself

horizontally except in orbit

EPD Aperture Covers General covers for protection Separate covers to contain isotope sources for

calibration in TVAC

FGM Cover Stowed FGM to be covered with vacuum-safe

plate when not in use

Solar Panel Covers Secured above panels to protect cells without

being in direct contact with cell coverglass

Bonus Volume Cover Secured to roll cage to protect stowed antennas

12

SPECIFIC I&T GSE

U.S. AIR FORCE

Thank you to all of our sponsors, stakeholders,and contributors

Shaun Murphy @ Northrop GrummanKatharine Gamble @ UT Austin

Jim White WD0E @ Colorado Satellite ServicesMark Spencer WA8SME @ ARRL

Tony Monteiro AA2TX & Bob Davis KF4KSS @ AMSAT-NA

13

ACKNOWLEDGEMENTS

U.S. AIR FORCE

Questions?

14