11

Flight Test Instrumentation Package for the L-29 Delfin Turbojet

For theQuarterly Review of the NASA/FAA Joint University

Program for Air Transportation ResearchFriday June 14th, 2002

Michael S. Braasch, Ph.D., P.E.Curtis CutrightJansen Litter

Avionics Engineering CenterOhio University, Athens

22

Purpose

• Hardware/software sensor testbed

• Software INS/GPS integration

• Noise versus dynamic tracking error trade off

• Synthetic aperture radar

• Aircraft system id/flight control design educational tool

33

Flight Test Vehicle

• L - 29 Delfin

• High Altitude 11 Km

• High Speed 354 knots

• Fully Aerobatic

Flight Specs Taken From http://aeroweb.brooklyn.cuny.edu/specs/aero/l-29.htm

44

Delphin Equipment

•Navigation Grade INS

•Industrial Keyboard

•Shock-hardened Computer

•Industrial Flat Panel Display

•NovAtel GPS Receiver

•Tactical Grade IMU*The IMU will be integrated into the system at a later date

55

Project Development

• Initial equipment installation is complete

• GPS and INS data collected simultaneously in real time

• In process of supplying INS unit with 28VDC

66

System Block Schematic

ADC INS

PC104

GPS

data

data

data

12 VDC

Aircraft Power

28 VDCINV

115VAC/ 400Hz

Potentiometer

data

Power

Data

77

INS Data Collection System Power Specifications

Unit Voltage Current PowerINS 115VAC/400HZ 2A 230W

INS (backup) 28VDC 10A 280W

INS Cooling Fan

28VDC

PC104 8-32VDC 11A Max 85W Max

ADC 28VDC 350mA 10W Max

Monitor 12VDC 3.5A 42W

GPS 6-18VDC 2.8W(3.3W Max)

88

PC104 Power Distribution

Component Voltage Current Power

CPU Module 5VDC 2A(1.5A Max) 10W

CM102 Floppy 5VDC 125mA 625mW

CMT107 Hard-drive

5VDC 1A max(fused) 5W

Network Card 5VDC 200mA 1W

Keyboard 5VDC 200mA 1W

GPS +12VDC 235mA 2.8W

99

PC104 Power Availability

Voltage Current Power

5VDC 12A 60W

+12VDC 2A 24W

-12VDC 500mA 6W

Maximum Power Output From PC104: 75W

1010

System Schematic

ADC

Baro ReturnBaro Signal

+5 Baro Excitation

H

LOutput

+28VGND

Case GND

333414

27

9

181936

Potentiometer

1111

System Schematic Continued

K4

K5

H

LADC Data

151178

115 VAC115 VACChassis GND+28V+28V GND

INS Unit

HL

Input

HL

Output

Mode Select

A8A9

G7G8

F1

ON

(M1)

Middle Insert

Lower Insert

Middle Insert

A5 SDI-MSB

1212

System Schematic Continued

417

114

ARINC CardPC104

Initialization

Data

Serial Port 2

Serial Port 1

43

21 +5V

+5V GND

+12V GND+12V

Power Plug

1313

System Schematic Continued

+12V

+12V GND

Power

Serial Port

I/O1 PPS

Novatel GPS Receiver

1414

Installed Equipment

ADC Inverter

1515

1616

Installed Equipment Continued

Industrial Keyboard INS On Switch

1717

Installed Equipment Continued

Novatel GPS Receiver Control Switches

1818

Installed Equipment Continued

GPS Antenna

1919

GPS Data

-83 -82.95 -82.939.42

39.43

39.44

39.45

39.46

39.47

39.48

39.49

39.5

Longitude

Latit

ude

Lat/Lon from Delphin Flight Test

Feb 6, 2002 Ross County Airport

2020

GPS Data Continued

0 5 10 15 20 250

200

400

600

800

Time

Vel

ocity

(ft

/s)

0 5 10 15 20 250

2000

4000

6000

8000

10000

Time

Alti

tude

(ft

)

Feb 6, 2002 Ross County Airport

Rolls

Rolls

Hammer Head Stall

Hammer Head Stall

2121

GPS Data Continued

2222

INS

• INS Data has been collected on one flight test

• Latitude and Longitude was post processed from the collected data

• Initially, data seemed to be fine

2323

GPS and INS Data

2424

GPS and INS Data Continued

2525

GPS and INS Data Continued

2626

GPS and INS Data Continued

2727

Analysis

• GPS and INS drift apart as expected

• 6 Mile difference by end of flight test

• Error much too large for INS unit

2828

Analysis Continued

• A problem with the INS installation was discovered and corrected

• INS can send unreliable data if not initialized properly

• Error was masked from view

2929

INS Static Test

3030

INS Static Test

3131

INS Static Test

3232

Conclusion

• INS and GPS data collection is ongoing

• INS data collection software is still being refined and updated

• More flight testing is needed to determine if the INS problem is really fixed

3333

Contact Information

Principle Investigator: Dr. Michael Braasch

Braaschm@ohiou.edu

Research Engineer: Curtis Cutright

Cutright@ieee.org

Research Associate: Jansen Litter

JansenLitter@hotmail.com