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Various levels of Simulation for Slybird MAV using Model Based Design Kamali C * , Shikha Jain * , Vijeesh T $ Sujeendra M R & , Sharath R & * Scientist, $ Technical Officer & Project Assistant Flight Mechanics and Control Division National Aerospace Laboratories, Bangalore Autonomous and remotely controlled Micro Aerial Vehicles (MAVs) have gained a high level of popularity during the last decade both in civilian and military applications. National Aerospace Laboratories (NAL) has been carrying out research and development activities on various supporting technologies crucial for the development of MAVs thereby enhancing the performance of the vehicle to accomplish various missions. NAL Slybird is a mini-unmanned aerial vehicle (UAV) developed by NAL. Its primary users will be police and the military services. Design & implementation of an autopilot in such systems assumes the next priority in achieving an autonomously flying MAV. An essential requirement to achieve the above goal is through a suitable modeling & simulation platform. Thus, this presentation takes the audience through the strategies developed for performing various levels of MAV simulation. The following levels of simulation are performed for Slybird MAV using MATLAB/Simulink: Open Loop Simulation (OLS) Model In the Loop Simulation (MILS) Software In the Loop Simulation (SILS) Processor In the Loop Simulation (PILS) Hardware In the Loop Simulation (HILS) The OLS responses are validated with actual flight data and results will be shown. The MILS and SILS include various subsystems such as estimator, path planning and control algorithms all developed in SIMULINK. Demonstration of PILS for Slybird MAV using open source mission planner software and ARDU autopilot (APM 2.6) will also be performed. The HILS architecture discussed in this presentation is a demonstration of rapid prototyping technique using RTWT and XPC Target.
Transcript
Page 1: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Various levels of Simulation for Slybird MAV using Model Based Design

Kamali C*, Shikha Jain*, Vijeesh T$

Sujeendra M R&, Sharath R&

* Scientist, $ Technical Officer

& Project Assistant

Flight Mechanics and Control Division National Aerospace Laboratories, Bangalore

Autonomous and remotely controlled Micro Aerial Vehicles (MAVs) have gained a high level of popularity during the last decade both in civilian and military applications. National Aerospace Laboratories (NAL) has been carrying out research and development activities on various supporting technologies crucial for the development of MAVs thereby enhancing the performance of the vehicle to accomplish various missions. NAL Slybird is a mini-unmanned aerial vehicle (UAV) developed by NAL. Its primary users will be police and the military services. Design & implementation of an autopilot in such systems assumes the next priority in achieving an autonomously flying MAV. An essential requirement to achieve the above goal is through a suitable modeling & simulation platform. Thus, this presentation takes the audience through the strategies developed for performing various levels of MAV simulation. The following levels of simulation are performed for Slybird MAV using MATLAB/Simulink: • Open Loop Simulation (OLS) • Model In the Loop Simulation (MILS) • Software In the Loop Simulation (SILS) • Processor In the Loop Simulation (PILS) • Hardware In the Loop Simulation (HILS) The OLS responses are validated with actual flight data and results will be shown. The MILS and SILS include various subsystems such as estimator, path planning and control algorithms all developed in SIMULINK. Demonstration of PILS for Slybird MAV using open source mission planner software and ARDU autopilot (APM 2.6) will also be performed. The HILS architecture discussed in this presentation is a demonstration of rapid prototyping technique using RTWT and XPC Target.  

Page 2: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

NATIONAL

AEROSPACE

LABORATORIES

BANGALORE-560 017 INDIA

CSIR-NAL

Various levels of Simulation for Sl bi d MAV i M d l B dSlybird MAV using Model Based

DesignKamali C

Shikha JainVijeesh T

Sujeendra MRSharath R

Page 3: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

MotivationNATIONAL

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CSIR-NALMotivationIn order to design robust and reliable flight guidance and control systems, itg g g y ,

is essential to have mathematical models of the airframe dynamics and

other subsystems of adequate fidelity.

There is also a need to develop a simulation and testing framework that

enables seamless integration of onboard software from design to onboard

implementation.

Accurate modeling and simulation of aircraft achieves significant reduction

in flight testing time and hence is efficient.

Page 4: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Slybird MAVNATIONAL

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• Slybird is an Micro Air Vehicle (MAV) developed byy ( ) p yNational Aerospace Laboratories with surveillance asthe main application.

Page 5: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Wind tunnel testingNATIONAL

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• At HAL, Bangalore low speed wind tunnel Slybird 1:1 modeli d i ld h d i d i d f b ildiis tested to yield the aerodynamic data required for building upthe simulation.

• The data is subsequently modeled as multi dimensional lookThe data is subsequently modeled as multi dimensional lookup tables for making the aerodynamics block.

Page 6: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

NATIONAL

AEROSPACE

LABORATORIES

BANGALORE-560 017 INDIA

CSIR-NAL

Other data requirement

• RPM versus thrust data to model the propeller.• Mass CG Inertia data• Mass, CG, Inertia data.• Geometry data such as wing span, wing

f d d i h dsurface area and mean aerodynamic chord.

Page 7: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

TrimmingNATIONAL

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CSIR-NALTrimming

Trimming is a condition where all state derivativesTrimming is a condition where all state derivativesare zero. This condition is essential to start thesimulation with proper initial conditions.s u at o w t p ope t a co d t o s.Numerical trim is performed using the linearizationtool This is optimization program whose costtool. This is optimization program whose costfunction is xdot=0.Here wings level trim is performed that solves forHere wings level trim is performed that solves forelevator, throttle, angle of attack.

Page 8: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Screen shot for trimmingNATIONAL

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Page 9: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

LinearizationNATIONAL

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CSIR-NALLinearization

Linearization tool is used to achieve thisLinearization tool is used to achieve this.

Linear analysis points are selected.

Linear models are generated as per the required trim values.

Based on the linear models, the control design is carried out.Based on the linear models, the control design is carried out.

Matlab code can be generated for trimming and linearization

f h l f b h ifrom the tool for batch processing.

Page 10: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Screen shot for linearization and M tl b d ti

NATIONAL

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CSIR-NALMatlab code generation

Page 11: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Slybird - Closed loop architecture

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E lEuler

A l

Aileron Command

Elevator Command

Slybird Closed loop architecture

Euler Angles and

Velocity

Position

AnglesSix DOF

Simulation Model

IMU and GPS Sensor Estimator

Elevator Command

Rudder Command

State E i

Position

os t o

Velocity

ModelThrottle Command

Heading Command

Estimates

Altitude Command

Path Planning

Outer Loop PID Controller

Inner Loop PID Controller

CONTROLLER

Page 12: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

NATIONAL

AEROSPACE

LABORATORIES

BANGALORE-560 017 INDIA

CSIR-NAL

Various levels of Simulation

• Open Loop Simulation• Model In the Loop Simulation (MILS)Model In the Loop Simulation (MILS)• Software In the Loop Simulation (SILS)

P I h L Si l i (PILS)• Processor In the Loop Simulation (PILS)• Hardware In the Loop Simulation (HILS)

Page 13: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Open Loop Simulation-Slybird

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[x_State]

[xdot_State]

u0(1)

Flap

K[Elevator] 3

2

TAS[alpha]

[TAS]

airspeed

p p y

[bodyvel]-K-

0

-K-

[Elevator]

[Aileron]

[Rudder]

5

p

4

beta

3

alpha

[q]

[p]

[beta]servo_ear

1

caero

0[Rudder]

8

psi

7

r

6

q

[psi]

[r]

[q]

Demux[x_State]

From54

[mach]

Demux[ax]

11

10

phi

9

theta

psi

[phi]

[lat]

[theta]16

Mach14

QBAR

[qbar]

[mach]Demux-K-[Throttle]

throttle_controller Throttle_inThrottle_in

13

12

lon

lat

[HFT]

[lon]15

VCAS

Demux

[6x1]

Alt

[thrust]HFTvdot=1

SLYBIRD dynamicsd i

Page 14: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Autopilot ModesNATIONAL

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CSIR-NALAutopilot Modes

ManualManual

Stabilized

Return to launch

LoiterLoiter

Fly by wire

Auto (Take off, landing and way point navigation)

Page 15: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Model in the Loop Simulation

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CSIR-NALModel in the Loop Simulation• Here the aircraft OL model and the controller model run in theHere the aircraft OL model and the controller model run in the

same PC in offline mode.

Thi i l i i d d i h l id d• This simulation required to design the control guidance and

estimation algorithm.

RC control Simulink‐NRT

Aircraft 6 DOF model

Controller/Autopilot

Page 16: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Slybird - MILSNATIONAL

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Page 17: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

NATIONAL

AEROSPACE

LABORATORIES

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CSIR-NALSlybird - SILSSlybird SILS

Compiled code is

incorporated into the

overall simulation

Required for evaluation ofRequired for evaluation of

onboard auto code

f i li i d i Ai f Controller/Autopilot

RC controlSimulink‐NRT

functionality in designer’s

desk .

Aircraft 6DOF model

Controller/Autopilot(C-code/S-function)

Page 18: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Rapid Control prototypingNATIONAL

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HOST PC• The aircraft 6 DOF

This is intended to verify the onboard code on a generic target before burning the codeon the actual target hardware.

AIRCRAFT(6 DOF)

Packet Input

Position

Elevator

Rudder

Packet Output

Angular Rates

Accelerations

Aileron

HOST PC• The aircraft 6 DOFsimulation application willbe running in the windowsreal time environment

Throttle Velocity

User Wi d

• Controller simulationapplication will be runningin the xPC target

Datagram Protocol(UDP)

User Datagram Protocol(UDP)

WindowsReal Time

KernelReal Time

in the xPC targetenvironment.

• The data’s are exchangedb i UDP l

UDP SEND CONTROLLER

UDP RECEIVE

(UDP)

Position

Angular RatesAcceleratio

Aileron

Elevator

Rudder

TimeKernel

by using an UDP protocolin real time.

nsVelocityThrottle

TARGET PC

Page 19: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Results

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CSIR-NALResultsRCP

Page 20: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

PILS

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PILS• Aircraft model runs in the accelerated modeAircraft model runs in the accelerated mode.

• The controller runs on the target micro controller (autopilot

hardware)hardware)

• No input/output cards are used, a USB connection is used to

exchange data between the control system and the modelexchange data between the control system and the model.

• The purpose of this simulation is to test that all functionalities of the

controller are correctly computed in the target hardwarecontroller are correctly computed in the target hardware.

Page 21: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Architecture of PILS with ARDUPLANE

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Architecture of PILS with ARDUPLANE (APM 2.6) and Mission planner

MATLAB/SIMULINK

ARDUPLANEAutopilot (APM 2 6)

UDP protocol

USB Interface

MissionPlAircraft Model (APM 2.6)

XBEE

32 bit dual core/quad core desktop PC

Planner

Page 22: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

PILS with APM 2.6 and Mission NATIONAL

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planner

Mission Planner

Ai ft M d lAircraft Model

APM Board

Page 23: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

NAL AutopilotNATIONAL

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• Designed with four layer PCB fabrication

technology.

• Onboard IMU, onboard pressure sensor

• Data logging in micro SD card

Parameter  Description  Range 

Processor  ARM CortexM3 CPU core  32 ‐ Bits 

Vdd Input Voltage  1.8 ‐ 3.3 Volt 

Technical Specification

p g

Clock  Operating  Frequency  24 MHz 

ROM  Programmable memory  256 Kbyte 

JTAG Connector  Programming, debugging  10  Pin 

I2C Interface  4 I2C Interface  100/400 Kbps 

UART Interface 2 UART Port 9.6/57.6 Kbps NAL Autopilot Version 3 (APV3)UART Interface  2 UART Port  9.6/57.6 Kbps 

SPI Interface  3 SPI Port  >1 Mbps 

PWM 16 Channels 3.3 V

Temperature  Industrial temperature  ‐40 to +85°C 

Sensors 3 Axes (Gyro, Accelerometer, Magnetometer) + Static Pressure

NAL Autopilot Version 3 (APV3)

Magnetometer)  + Static Pressure 

Dimensions  ‐‐‐ 50mm x 50mm 

Weight  ‐‐‐ 12.2 grams 

Page 24: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Procedure to deploy auto code in to an

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Procedure to deploy auto code in to an Embedded Target

Page 25: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

PILS with NAL Autopilot board and

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CSIR-NALPILS with NAL Autopilot board and Mission planner

Mission Planner

Aircraft Model

NAL Autopliot

Page 26: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

HILS

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CSIR-NALHILS• Similar to PIL simulation, the autopilot runs onSimilar to PIL simulation, the autopilot runs on

the hardware.

• Now aircraft model runs in real time using

XPC target.

• M th i t t t d t i iti• Moreover the input-output data acquisition

cards are used to model the sensors and to

drive the actuators.

Page 27: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Slybird HILS setupNATIONAL

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CSIR-NALy pSchematic of Hardware in loop simulator

MATLAB/SimulinkReal Time flight

Host PC Via Ethernet

XPC Target(Slybird Model)

MAX 232

Real Time flight model

Quatech(RS-232)

Baseboard(RS-232)

MAX 232

Customized k t

Visualization PCMission Planner

MAX 232

J8J12

NAL Autopliot

wirelesspackets

XBEE

XBEE XBEE

Page 28: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Communication ProtocolNATIONAL

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xPC Target

(Real Time OS)

Quatech PCI Driver

(QSC 100 F)

Interfaced to Mother Board

TotalCount Header Length

Data Length Payload Check Sum Terminator

Check Sum Range

1 byte 1 byte 1 byte Data Length 1 byte 1 byte

Protocol Data frame

Total Count= Datalength(byte)+5 bytes

Page 29: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Message ConstructionNATIONAL

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Unpacking and Packing of data for the transmission

Page 30: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

HILS with xPC Target and NAL NATIONAL

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Autopilot boardHost PC

XPC Target

Via Ethernet

Via Serial

Visualization PC NAL Autopliot

UART to USB

converter

Page 31: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

HILS-NAL autopilot

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CSIR-NALHILS NAL autopilot

Visualization PC

XPC Target

Host PC

g

NAL Autopliot

Page 32: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Slybird Flight data comparison

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CSIR-NALSlybird Flight data comparison20

22

y (m

/s)

0

0.5

m/s

2 )

0 2 4 6 8 1016

18

Time (sec)

Velo

city

0 2 4 6 8 10-0.5

0

Time (sec)

Ay (m

50

100

g) 50

100

g)

0 2 4 6 8 10-50

0

50

Time (sec)

Phi (

deg

0 2 4 6 8 10-50

0

50

Time (sec)

Psi (

deg

200/s) 100/s)

0 2 4 6 8 10-200

0

Time (sec)

Roll

rate

(deg

/

0 2 4 6 8 10-100

0

Time (sec)

Yaw

rate

(deg

/

20 0

0 2 4 6 8 10-20

0

20

Time (sec)

Aile

ron

(deg

)

0 2 4 6 8 10-50

0

50

Time (sec)

Rudd

er (d

eg)

Time (sec) Time (sec)Longitudinal Dynamics - Flight vs. Simulated OutputLateral Dynamics - Flight vs. Simulated Output

Page 33: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

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Future work proposed on HILSI2C ( 8 Channels)

SPI ( 4 Channels)

6DOF  RT Target

OBC

(UUT)

UART I2C ( 4 Channels)

RS 232 ( 2 Channels)

CAN ( 2 Channels)

Systemg ( )

PWM ( 10 Channels)

ADC ( 16 Channels)

DAC ( 16 Channels)

DIO ( 16 Channels)

DIO ( 16 Channels)

Page 34: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

NATIONAL

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LABORATORIES

BANGALORE-560 017 INDIA

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AcknowledgementsOur sincere thanks to• Director, NAL• Dr. G. K Singh and his team• Dr. C M Ananda and his team• Dr. Jatinder Singh, Head FMCD• Dr. Abhay A Pashilkar, Group head, Flight Simulation

D R h G H d MAV it• Dr. Ramesh G, Head, MAV unit.

Page 35: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

References1. C Kamali, Alexander Kale,” Development of Six DOF model for Class-I MAV”, OT 04-01, September, 2013.

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2. “Preliminary test results on 1:1 scale UAV models” Report No. HAL/ARDC/UAV/WNT/001, July 2012.

3. Alexander Kale, Shikha Jain, C Kamali,” Simulation, Modal Analysis and Parameter Estimation of Class-I MAV”,OT 04-02, October 2013.

4. Shikha Jain, C Kamali,” Experimental Validation of NAL’s Class 1 MAV Simulation Model Using Flight Data”, OT04-04, December 2013.

5. Shikha Jain, C Kamali,” Software In the Loop Simulation (SILS) for NAL’s Class 1/Similar class MAV”, OT 04-06,June 2014.

6. Kamali C, Pranshu Basaniwal, Shikha Jain, Vijeesh T ,”Processor In the Loop Simulation (PILS) for NAL’s Class1/Similar class MAV”, OT 04-07, July 2014.

7. Sanketh Ailneni, Sudesh k. Kashyap & Shantha Kumar N, “Evaluation of EKF based Attitude and HeadingEstimation in Processor in the Loop Simulation (PILS) setup with ATMEGA 2560 (ArduPilotMega) Processor”,July 2013.

8 S j d K li C A dh P ll i “T j t T ki d P th F ll i Al ith f t8. Sujeendra, Kamali C, Andhe Pallavi, “Trajectory Tracking and Path Following Algorithm for autonomousnavigation of Micro Air Vehicle” National Conference on Recent Advance in Communication Networks, March2014.

9. Viswanathan S, Guruganesh R, “Design of Autopilot for Class I MAV using Classical Control”, November 2013., g , g p g ,

10. CM Ananda, Pankaj Akula, Sunil Prasad, Pavan Kumar KVVNSD, Design and Development of MiniatureIndigenous Digital Autopilot for Micro Air Vehicle (MAV), in: The 3rd International Conference on RecentAdvances in Design, Development and Operation of Micro Air Vehicles, Nov, 2014.

Page 36: Various levels of Simulation for Slybird MAV using Model Based … · 2018. 3. 14. · Various levels of Simulation for Slybird MAV using Model Based Design Kamali C*, Shikha Jain*,

Th k YThank You


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