US Naval Academy LABsats Bob Bruninga, WB4APR AIAA JHU/APL Educational Seminar 10 Nov 2006.

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US Naval Academy LABsats Bob Bruninga, WB4APR AIAA JHU/APL Educational Seminar 10 Nov 2006
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Transcript of US Naval Academy LABsats Bob Bruninga, WB4APR AIAA JHU/APL Educational Seminar 10 Nov 2006.

US Naval Academy LABsatsBob Bruninga, WB4APR

AIAA JHU/APL Educational Seminar 10 Nov 2006

USNA SatellitesBob Bruninga, WB4APR

Basic USNA’sat

Digital Transponder

Telemetry system has 1200/9600 baud available

•STP Experiments can interface to serial ports here

•PCsat

SCIENCE

USNA-0203

The USNA Constellation

USNA PCSAT2 on ISS

Launched Aug 2006, attached to ISS

1 Year of 3 Mbytes data per day

Supported Packet and Voice Relay

Returned Sept 2006

The comm channels can potentially draw from over 30,000 experimenters for easy assessment of loading and scaling issues.

Not only the sensors and users exist, but the global Internet collection and distribution system also exists from PCSAT1 & 2.

Our Satellites provide a low cost educational transponder supporting not only GPS position reporting but also remote WX stations and other data link experiments and other University and School Experiments.

Space User Baseline PCSAT validates our links

Vandegriff

SCIENCE

USNA-0203

PCSAT2 User Plot 18 Apr 06

See www.ariss.net

Global Internet Linked Ground Stations

All downlinks available live on web via Participating internet linked Ground Stations

www.ariss.net pcsat.aprs.org

SCIENCE

USNA-0203

Types of Labs• Antenna Labs: . . . . . . . . Link, Patterns, Gain, Beamwidth, SWR • Electrical Power sys: . . Solar Cells, batteries and Regulators • Transmitters: . . . . . . . . . TX power and antenna matching • Receivers: . . . . . . . . . . . Receiver sensitivity, selectivity and Bandwidth• Comms: . . . . . . . . . . . . . FSK, AFSK,PSK ; and TDMA and FDMA • Telemetry: . . . . . . . . . . . Signals, decoding, equations 5 channel A/D • Command / Control: . . . Using the 3 commandable ON/OFF circuits. • CPU and Experiments: . Aux serial port – processor, GPS, etc • GPS interface: . . . . . . . . Using a GPS input for position determination • Attitude Control: . . . . . . .Passive/active Magnetorquing & wheels. • Thermal Control: . . . . . . Absorbtivity, Emissivity, Conduction.

LABsat Examples

Ground Stations

Laptop Ground Station for RAFT

Antenna Tests

Uses small 2.4 GHz camera/transmitters

First observe dipole link (1000’)

Place dipole at dish focus and measure gain

Swing dish to see Beamwidth

Antenna Tests

Using PI network to match spacecraft antenna for best SWR

Using GPS signals to plot antenna pattern of GPS

Antenna Tests

RF LABsat model on rotor

Rotator and S/A to plot pattern

Dipole 1

Dipole 1

Antenna Phasing experiment

Transmitter TestsPower out

Efficiency

Temperature

Spectrum and EMI

Receiver Tests

Demodulation - FSK

All Seven Student LABsats on the air

Sharing a single TDMA channel

Using FSK for demodulation

Demodulation - PSK

LABsat configured as HF to UHF linear transponder

Indoor LABsat RX

PSK-31 Waterfall Spectrum display on Student’s workstation

KPC-3+ Telemetry System

KPC-3+ Telemetry System

Used for Data LoggingSolar Panel Lab

Satellite Power SystemsSolar Panel IV curve

Series/Shunt Regulators

NiCd Charge/Discharge

Attitude Control Labs

Thruster Firing

Passive Magnetic Stabilization

MagneTorquing Stabilization

Momentum Wheel Stabilization

Serial Data Telemetry

APRS Global Network

Google for “USNA Buoy” Select USNA-1This data is LIVE

Google

WB4APR-9

The comm channels can potentially draw from over 30,000 experimenters for easy assessment of loading and scaling issues.

Not only the sensors and users exist, but the global Internet collection and distribution system also exists from PCSAT1 & 2.

Our Satellites provide a low cost educational transponder supporting not only GPS position reporting but also remote WX stations and other data link experiments and other University and School Experiments.

Antenna Deployment

Typical ISS Passes

USNA SatellitesBob Bruninga, WB4APR