Cansat 2008: University of New Hampshire Final Presentation

CANSAT Final Presentation June 15 th 2008

WildCatSat Team

Outline

Design Overview

Raw Data Plots

Processed/Analyzed Data Plots

Outcome of Flight Ops/Failure Analysis

Comparison of Actual CONOPS to Planned CONOPS

Mechanical Design Overview

System Bus:

ABS Plastic

Rapid Prototype using 3-D Printer

Recovery System:

Octagonal Parachute

Rip-Stop Nylon

Area: 1.016 m 2

Nylon Cord

Up-righting System:

Hinged side doors

Torsion springs provide force to open doors

Pin connected to servo motor holds doors in place/releases doors

Parachute Release System:

Pin attached to side door

Pin holds parachute to bus while doors closed

Total Measured Mass: 470g

Mechanical Design Overview

Structural Drawings

Electrical System Diagram Processor Pressure Sensor Transceiver Buzzer Servo Transceiver Computer

Electrical Design Overview

Sensors:

SCP1000 Barometric pressure and temp. sensor

Microprocessor:

Atmel ATMega168

Transmitter:

Aerocomm AC4790-1000M

Battery

11.1V 800 mAh Li-Poly

12.26V Initial, 12.19V After Mission: 0.7V Drop

Ground Station Computer:

HP Pavilion N5425

Ground Station Receiver:

Aerocomm ConnexLink 4790

Ground Station Antenna:

External high gain omni-directional antenna

Ground Station

Raw Data Plots

Processed Data Note: Matlab truncation of LS digit = loss in accuracy 0 20 40 60 80 100 120 140 160 180 200 8.4 8.6 8.8 9 9.2 x 10 4 Mission Time (s) Pressure (Pa) 0 20 40 60 80 100 120 140 160 180 200 -200 0 200 400 600 800 Mission Time (s) Altitude (m)

Processed Data (cont.) (Processed with Matlab’s ‘Diff’ and ‘Filter’ functions and window size of 10) From VTI Tech: “Assumed constant temp. gradient of dT/dH from 1976 US Standard Atmosphere” H = 30°C/(6.5°C/km)*(1-(P/101325Pa)^0.19 Reference: VTI Technologies

Flight Operations

Altitude Transmission: Success

Average Descent Rate: 3.3767 m/s

Descent Time: (1340s-1160s)/60 ~3 min

Flight Operations (cont.)

Recovery: Success

Up-righting System: Success

Ground Temperature (bonus): Not Met

From: 34.48.097N 101.35.244W To: 34.47.88N 101.35.562W ~1.28km Lateral Distance Traveled Reference: http://www.movable-type.co.uk/scripts/latlong.html

Pattern Loss ~30%

Ground Absorption

Terrain

Ground Station Antenna height

a) Elev. Pattern b) Azimuth Pattern Reference: Aerocomm Corp. Failure Analysis

Satellite activated

Satellite loaded into rocket

Satellite takes initial pressure reading

Rocket launches

Satellite detects pressure change, starts sending

pressure/altitude data

Satellite ejects from rocket

Parachute deploys, slowing descent

Satellite descends at less than 4.6 m/s

Satellite continues to transmit data

Satellite lands

Doors open up-righting satellite

Parachute released

Buzzer activates

Ground temperature reading and transmission

Data transmission stops

Preparation Launch Deployment Descent Recovery CONOPS Comparison

UNH ECE Dept.

UNH ME Dept.

WildCatSat Sponsors

Jon Arlington at

Orbital Sciences Corp.

The Byrd Family

Todd Gross Professor and Chair May-Win Thein Associate Professor

Questions? Professor May-Win Thein Project Advisor Ph.D Mechanical Engineering [email_address] Robert Terry Team Leader Electrical Engineer [email_address]