RAFTRAFTRadar Fence Radar Fence TransponderTransponderMIDN 1/C Lauren Baker - Team Leader/ MIDN 1/C Lauren Baker - Team Leader/

Ground SupportGround Support

MIDN 1/C Brandon Colvin – Communications/ MIDN 1/C Brandon Colvin – Communications/ PowerPower

MIDN 1/C Robert Tuttle – Structure/ ThermalMIDN 1/C Robert Tuttle – Structure/ Thermal

BackgroundBackground30 to 50 in Construction30 to 50 in Construction

AIAA/USUSmall Sat Conference

30% of papers were for PICO, NANO and CUBEsats

All smaller than 10 cm

How to Track them???

Mission StatementMission Statement

The mission of CUBESAT-RAFT is to:The mission of CUBESAT-RAFT is to: provide the Navy Space Surveillance, or NAVSPASUR, provide the Navy Space Surveillance, or NAVSPASUR,

radar fence with a means to determine the bounds of a radar fence with a means to determine the bounds of a constellation of CUBESATS otherwise undetectable to the constellation of CUBESATS otherwise undetectable to the radar fence radar fence

to enable NAVSPASUR to independently calibrate their to enable NAVSPASUR to independently calibrate their transmit and receive beams using signals from CUBESAT-transmit and receive beams using signals from CUBESAT-RAFT. -RAFT. -

This must be accomplished with two CUBESATS, one that will This must be accomplished with two CUBESATS, one that will actively transmit and receive, and one with a passively actively transmit and receive, and one with a passively augmented radar cross-section. augmented radar cross-section.

Additionally, CUBESAT-RAFT will provide experimental Additionally, CUBESAT-RAFT will provide experimental communications transponders for the Navy Military Affiliate communications transponders for the Navy Military Affiliate Radio System, the United States Naval Academy’s Yard Radio System, the United States Naval Academy’s Yard Patrol crafts, and the Amateur Satellite Service.Patrol crafts, and the Amateur Satellite Service.

NSSS Radar FenceNSSS Radar Fence

NSSS Radar FenceNSSS Radar FenceTransmit Power: 768 kW of power from Lake Kickapoo, TX

Antenna Gain: About 30dB

Transmission Sites: Lake Kickapoo, Texas

Jordan Lake, Alabama

Gila River, Arizona

Receiving Sites: San Diego, California

Elephant Butte, New Mexico

Red River, Arkansas

Silver Lake, Mississippi

Hawkinsville, Georgia

Tattnall, Georgia

RAFT1 and MARScomRAFT1 and MARScom

RAFT1 Mission RAFT1 Mission ArchitectureArchitecture

Audio SpectragramAudio Spectragram

Example audio Spectragram

Expected from one-way DopplerDuration about 1-3 secs

Pass GeometryPass Geometry

Raft1 Block DiagramRaft1 Block Diagram

RAFT1 Comms and RAFT1 Comms and MultiplexingMultiplexing

RAFT1 RAFT1 Internal Internal DiagramDiagram

RAFT1 Magnetic Attitude RAFT1 Magnetic Attitude ControlControl

MARScom Mission MARScom Mission Architecture Architecture

Military Affiliated Radio SystemMilitary Affiliated Radio System

The Mission of the MARS system is to:

Provide auxiliary communications for military, federal and local disaster management

off icials during periods of emergency or while conducting drills….

Assist in effecting normal communications under emergency conditions.

Handle morale and quasi-official message and voice communications traffic for

members of the Armed Forces and authorized U.S. Government civilian personnel

Provide, during daily routine operations, a method of exchanging MARSGRAMS and

… contacts between service personnel and their families back home.

Yard Patrol Craft ApplicationYard Patrol Craft Application

MARScom Block DiagramMARScom Block Diagram

RAFTRAFTDeploymentDeployment

RAFTRAFTAntennaAntennaSeparationSeparationMechanismsMechanisms

RAFT RAFT AntennaAntennaSpringsSprings

RAFT ScheduleRAFT Schedule Systems Definition complete – 15 APR 2004Systems Definition complete – 15 APR 2004 Systems Requirement Baseline – 30 APR 2004 (SRR)Systems Requirement Baseline – 30 APR 2004 (SRR) Prelim.Design Review (Internal USNA) – 15 MAY 2004Prelim.Design Review (Internal USNA) – 15 MAY 2004 System Design Complete – 15 OCT 2004 (CDR)System Design Complete – 15 OCT 2004 (CDR) Engineering Model Available for Testing – 15 Dec 2004Engineering Model Available for Testing – 15 Dec 2004 Flight Hardware for Integration/Flight – 15 May 2005Flight Hardware for Integration/Flight – 15 May 2005 Launch – Sept 2005Launch – Sept 2005