Difference between revisions of "Booz"

Latest revision as of 15:53, 20 June 2012

Overview

Booz is an extension of Paparazzi to VTOLs. At the current stage of the project, the system provides attitude stabilization, vertical and horizontal guidance and automatic navigation. It is able to use Paparazzi flight plans and uses Paparazzi telemetry and datalink, which means all the Paparazzi ground segment applications are available( plotter, settings, gcs, etc...)

The current avionics consist of 3 boards

The main board, comprising power supply, a LPC2148 and a barometer.
The IMU board, comprising gyroscopes, accelerometers, magnetometers and a 16-bit ADC.
The GPS board, using a LEA-5H by ublox.

Additional Booz boards:

The "power" board.

It flies on a variety of Quad-rotor platforms

and less common vehicles

Simulator

Paparazzi features the advanced NPS simulator which can serve many purposes, from learning how to operate a vehicle to evaluating control or estimation algorithms.

Hardware

Motor controllers

Booz is able to handle a number of quadrotor specific brushless motor controllers.

more info in BoozMotorControllers

Power board

The power board allows to switch power on and off on your vehicle as well as to make a clean wiring by avoiding wired Y

more info in BoozPowerBoard

Booz GPS

more info in BoozGPSBoard

IMU

Booz has support for its custom designed IMU as well as for Cloudcap Crista IMU

more info in BoozIMU

Autopilot

Current version of Booz autopilot is based on a lpc2148

more info in BoozAutopilot

A new version of the autopilot, based on a STM32 is in development

more info in Lisa

Airframes

One nice thing about quadrotors is that the mechanics being extremely simple, they can be build with very few tools. Booz mounting holes are compatible with popular of the shelf frames.

more info in BoozAirframes

Purchasing Hardware

There are now vendors offering Booz hardware, Please see the Get Hardware page for details.

Hardware Test

Booz comes with a number of simple test programs that you can use to validate a newly assembled board or learn how booz code works in case you want to extend it.

more info in BoozHardwareTest

Software

Peripheral support

Type #	Model	Booz	Lisa/L
IMU	Boozv1	yes	yes
	crista	yes	yes
	mti	?	no
	vn100	?	no
RC	PPM	yes	no
	spektrum	yes	yes
Actuators	asctec	yes	yes
	mkk	yes	yes
	servospwm	2	6
	CAN	no	in progress

Sensors Calibration

All the sensors needs to be calibrated in order to provide useful informations. The calibration process needs to be performed after the assembly of the vehicle is complete.

- Note: The barometer on the Booz Main board is designed to work between -300 to 928 meters MSL. In this range it will create a zero offset, and then give 10cm resolution for 100 meters of altitude. BEWARE! if you fly above 100m the ADC will saturate. In addition, if you are someplace that is above 928 meters MSL the baro will not calibrate on boot, and will not output values. If you look at the RAW messages you will see that the BARO_RAW message reads 0 for both values. To fix the latter issue, the Value of R20 on the Main board can be changed to change the range. An example: If R20 is changes from a 560ohm to a 100ohm resistor, the new measurable range would be from -300 to 1800 meters. Because this changes the gain on the sensor it will also change the amount of altitude you can read from the ADC. For this case we reduce the amount to ~90 meters.

more info in BoozSensorsCalibration

GCS notes

If you set your ground modems for an interface rate different than 9600bps you need to add a flag to the "link" program on startup. In GCS if you use "Execute" you will see "link" is the first. You can click stop, then modify the command line by clicking in the text area. Add the -s flag with the baud rate you use. In my case 57600. So I use: -s 57600. Then click "Redo" and link will be restarted with the new flag and value (and you will start seeing messages and GCS wil populate). So you don't have to repeat this each time do "Save Session" and this will save the changes.

Airframe settings and Flight testing

BoozAirframe

User Gallery

This page holds a list of current Booz users

BoozUserList

@@ Line 1: / Line 1: @@
+<div style="float: right; width: 30%"><categorytree style="float:right; clear:right; margin-left:1ex; border: 1px solid gray; padding: 0.7ex;" mode=pages>Autopilots</categorytree></div>
+<div style="float: right; width: 40%">[[Image:booz_logo.jpg|480px|right]]</div>
 == Overview ==
-<p>Booz is an extension of Paparazzi to VTOLs. At the current stage of the project, the system provides attitude stabilization, vertical guidance and automatic navigation. It is able to use simple Paparazzi flight plans ( only go instructions ) and uses Paparazzi telemetry and datalink, which means all the Paparazzi ground segment applications are available( plotter, settings, gcs, etc...)</p>
+<p>Booz is an extension of Paparazzi to VTOLs. At the current stage of the project, the system provides attitude stabilization, vertical and horizontal guidance and automatic navigation. It is able to use Paparazzi flight plans and uses Paparazzi telemetry and datalink, which means all the Paparazzi ground segment applications are available( plotter, settings, gcs, etc...)</p>
-<p>The current autopilot consist in 3 boards</p>
+<p>The current avionics consist of 3 boards</p>
 [[Image:booz2_main.jpg|240px]]
 [[Image:booz2_imu.jpg|240px]]
@@ Line 8: / Line 10: @@
 * The main board, comprising power supply, a LPC2148 and a barometer.
-* The IMU board, comprising gyroscopes, accelerometers, magnetometers and a 16 bits ADC.
+* The IMU board, comprising gyroscopes, accelerometers, magnetometers and a 16-bit ADC.
 * The GPS board, using a LEA-5H by ublox.
@@ Line 27: / Line 29: @@
 [[Image:booz2_a5.jpg|240px]]
-== Program Sources ==
+== Simulator ==
-Everything is at savannah.
+Paparazzi features the advanced [[NPS]] simulator which can serve many purposes, from learning how to operate a vehicle to evaluating control or estimation algorithms.
- -hardware in paparazzi4/trunk/hw/booz
- -code in paparazzi3/trunk
 == Hardware ==
@@ Line 44: / Line 44: @@
 more info in [[BoozPowerBoard]]
+=== Booz GPS ===
+more info in [[BoozGPSBoard]]
 === IMU ===
@@ Line 61: / Line 64: @@
 === Airframes ===
-One nice thing about quadrotors is that the mechanics being extremely simple, they can be build with very little tools.
+One nice thing about quadrotors is that the mechanics being extremely simple, they can be build with very few tools.
-Booz mounting holes are compatible with asctec and mikrokopter frames
+Booz mounting holes are compatible with popular of the shelf frames.
 more info in [[BoozAirframes]]
@@ Line 68: / Line 71: @@
 ===Purchasing Hardware===
 <p>There are now vendors offering Booz hardware, Please see the [http://paparazzi.enac.fr/wiki/Get_Hardware Get Hardware] page for details.</p>
-== Running a simulator ==
-[[BoozSimulator]]
 == Hardware Test ==
 Booz comes with a number of simple test programs that you can use to validate a newly assembled board or learn how booz code works in case you want to extend it.
-The ''Makefile'' for those is in ''conf/autopilot/booz2_test_progs.makefile''
-=== test_downlink ===
-Paparazzi's Makefile allow you to build different ''TARGETS'' (aka programs) using a doted notation. The begining of the ''Makefile'' reads
-<syntaxhighlight lang="make">
- #
- # test downlink
- #
- test_downlink.ARCHDIR = $(ARCHI)
- test_downlink.ARCH = arm7tdmi
- test_downlink.TARGET = test_downlink
- test_downlink.TARGETDIR = test_downlink
- #
- test_downlink.CFLAGS += -DBOARD_CONFIG=$(BOARD_CFG) $(BOOZ_CFLAGS)
- test_downlink.CFLAGS += -DPERIPHERALS_AUTO_INIT
- test_downlink.srcs   += $(SRC_BOOZ_TEST)/booz2_test_downlink.c
- test_downlink.CFLAGS += -DUSE_LED
- test_downlink.CFLAGS += -DPERIODIC_TASK_PERIOD='SYS_TICS_OF_SEC((1./10.))' -DTIME_LED=1
- test_downlink.srcs   += sys_time.c $(SRC_ARCH)/sys_time_hw.c $(SRC_ARCH)/armVIC.c
- #
- test_downlink.CFLAGS += -DUSE_UART1 -DUART1_BAUD=B57600
- test_downlink.srcs   += $(SRC_ARCH)/uart_hw.c
- #
- test_downlink.CFLAGS += -DDOWNLINK -DDOWNLINK_TRANSPORT=PprzTransport -DDOWNLINK_DEVICE=Uart1
- test_downlink.srcs   += downlink.c pprz_transport.c
-</syntaxhighlight>
-FIXME: More on this when syntax highlighting/line numbering works
-The command line to compile the "test_downlink" target for the BOOZ2_A1 aircraft would be
- make AIRCRAFT=BOOZ2_A1 test_downlink.compile
-and to upload this program to your board ( you don't really need to type the previous command, make is smart and will compile your program if needed when you ask him to upload it )
+more info in [[BoozHardwareTest]]
- make AIRCRAFT=BOOZ2_A1 test_downlink.upload
+== Software ==
+=== Peripheral support ===
-=== test_max1168 ===
+{|border="1"  cellspacing="0" style="text-align:center" cellpadding="6"
+!''Type #''!!''Model''!!''Booz''!!''Lisa/L''
+|-
+|IMU       ||Boozv1   ||yes||yes
+|-
+|          ||crista   ||yes||yes
+|-
+|          ||mti      || ? ||no
+|-
+|          ||vn100    ||?  ||no
+|-
+|RC        ||PPM      ||yes||no
+|-
+|          ||spektrum ||yes||yes
+|-
+|Actuators ||asctec   ||yes||yes
+|-
+|          ||mkk      ||yes||yes
+|-
+|          ||servospwm|| 2 || 6
+|-
+|          ||CAN      ||no || in progress
+|-
+|}
-the ''max1168'' is the 16 bits analog to digital converter chip used on the IMU to sample gyros and accels.
- make AIRCRAFT=BOOZ2_A1 test_max1168.upload
 == Sensors Calibration ==
-All our sensors needs to be calibrated in order to provide useful informations.
+All the sensors needs to be calibrated in order to provide useful informations. The calibration process needs to be performed after the assembly of the vehicle is complete.
-Accelerometers and Magnetometers calibration is critical for AHRS performances and can be performed using no special hardware. For the magnetometer, it is even very important that the calibration be performed in the fully assembled vehicle, with all systems powered. This is the so-called hard-iron calibration and will allow us to compensate for any constant parasitic magnetic field generated by the vehicle.
-The calibration process consist in finding a set of neutrals and scale factors for each sensor, such as
-<math>
-\begin{pmatrix}physical\_value_x\\physical\_value_y\\physical\_value_z\end{pmatrix} = \begin{pmatrix}sf_x&0&0\\0&sf_y&0\\0&0&sf_z\end{pmatrix} * (\begin{pmatrix}sensor_x\\sensor_y\\sensor_z\end{pmatrix}-\begin{pmatrix}n_x\\n_y\\n_z\end{pmatrix})
-</math>
-The principle of the calibration is the following : An accelerometer, on a vehicle at rest measures a constant vector ( the opposite of gravity ) in the earth frame, expressed in the vehicle frame.
-<math>
-DCM * \begin{pmatrix}0\\0\\-9.81\end{pmatrix} =
-\begin{pmatrix}sf_x&0&0\\0&sf_y&0\\0&0&sf_z\end{pmatrix} * (\begin{pmatrix}sensor_x\\sensor_y\\sensor_z\end{pmatrix}-\begin{pmatrix}n_x\\n_y\\n_z\end{pmatrix})
-</math>
-DCM is a rotation matrix that converts between earth frame and body frame. It will change when we change the orientation of the vehicle. Nevertheless, a rotation conserves the norm of a vector. We can thus obtain the following scalar equation that doesn't depend on the vehicle orientation :
-<math>
-.81^2 = ( sf_x(sensor_x-n_x) )^2 +  (sf_y(sensor_y-n_y) )^2 +  (sf_z(sensor_z-n_z) )^2
-</math>
-We can then record an important number of measurements in different orientations and find the set of scale factor and neutral giving the norm closest to 9.81
-Booz comes with a ( very unfriendly ) scilab script to perform this operation ( sw/tools/calibration/calib_accel_mag.sce ). Here is the way to use it
-Switch to the "raw sensors" telemetry mode and launch "server" to record a log.
-Move the quad in different orientations ( upright, inverted, on nose, on tail, on right side, on left side ) . You can also take some measurememts banking 45 degres.
+**Note:  The barometer on the Booz Main board is designed to work between -300 to 928 meters MSL.  In this range it will create a zero offset, and then give 10cm resolution for 100 meters of altitude.  BEWARE! if you fly above 100m the ADC will saturate.  In addition, if you are someplace that is above 928 meters MSL the baro will not calibrate on boot, and will not output values.  If you look at the RAW messages you will see that the BARO_RAW message reads 0 for both values.  To fix the latter issue, the Value of R20 on the Main board can be changed to change the range.  An example: If R20 is changes from a 560ohm to a 100ohm resistor, the new measurable range would be from -300 to 1800 meters.  Because this changes the gain on the sensor it will also change the amount of altitude you can read from the ADC.  For this case we reduce the amount to ~90 meters.
-Try to get an homogeneous distribution of your measurements. I find it better to let the quad rest while measuring. You can then run the scilab script to get your calibration coefficients.  It first makes an initial guess using min and max, ie for each axis
+more info in [[BoozSensorsCalibration]]
-neutral = 0.5 * (max + min)
+== GCS notes ==
+* If you set your ground modems for an interface rate different than 9600bps you need to add a flag to the "link" program on startup. In GCS if you use "Execute" you will see "link" is the first. You can click stop, then modify the command line by clicking in the text area. Add the -s flag with the baud rate you use. In my case 57600. So I use: -s 57600. Then click "Redo" and link will be restarted with the new flag and value (and you will start seeing messages and GCS wil populate). So you don't have to repeat this each time do "Save Session" and this will save the changes.
-sensitivity = 0.5*(max-min)
+== Airframe settings and Flight testing ==
+* [[BoozAirframe]]
-It then uses scilab's "datafit" algorithm to optimise the initial guess
+== User Gallery ==
-[[Image:calibAccel.png|240px]]
+This page holds a list of current Booz users
+[[BoozUserList]]
-Note for magnetometer:
+[[Category:Autopilots]] [[Category:Booz]]

Difference between revisions of "Booz"

Latest revision as of 15:53, 20 June 2012

Contents

Overview

Simulator

Hardware

Motor controllers

Power board

Booz GPS

IMU

Autopilot

Airframes

Purchasing Hardware

Hardware Test

Software

Peripheral support

Sensors Calibration

GCS notes

Airframe settings and Flight testing

User Gallery

Navigation menu

Difference between revisions of "Booz"

Latest revision as of 15:53, 20 June 2012

Overview

Simulator

Hardware

Motor controllers

Power board

Booz GPS

IMU

Autopilot

Airframes

Purchasing Hardware

Hardware Test

Software

Peripheral support

Sensors Calibration

GCS notes

Airframe settings and Flight testing

User Gallery

Navigation menu

Search