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Features:
•
Very compact and lightweight - 35 grams
•
Accurate AGL altitude measurements on ground, foliage and water
•
Fast update rate of 20 rps for the SF11/C, and 40 rps for the SF11/B
•
Includes serial, I2C, USB and analog interfaces with programmable
capabilities
•
Easy to configure using the built-in menu and LightWare Terminal
software
•
Fully calibrated and ready to run
•
Compatible with Pixhawk, APM and other flight controllers
•
Accurate, reliable altitude measurements in sunlight or dark
conditions
•
Not affected by: speed; wind; changes in barometric pressure; noise;
ambient light; terrain or air temperature.
SF11 Laser altimeter - Product manual - Revision 10
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© LightWare Optoelectronics (Pty) Ltd, 2021
SF11 Laser altimeter
Product manual
The definitive
laser altimeter for
fixed wing or multi-
rotor aircraft.
Ideal for automated
landings, precision
hovering and terrain
following.
|
www.lightwarelidar.com
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Table of Contents
Related Manuals for Lightware SF11/C
Summary of Contents for Lightware SF11/C
- Page 1 Very compact and lightweight - 35 grams • Accurate AGL altitude measurements on ground, foliage and water • Fast update rate of 20 rps for the SF11/C, and 40 rps for the SF11/B • Includes serial, I2C, USB and analog interfaces with programmable capabilities •...
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Page 2: Table Of Contents
Information found in this document is used entirely at the reader’s own risk and whilst every effort has been made to ensure its validity neither LightWare Optoelectronics (Pty) Ltd nor its representatives make any warranties with respect the accuracy of the information contained herein. -
Page 3: Overview
The SF11 is virtually immune to background light, wind and noise making it the ideal AGL altimeter for all kinds of terrain. Figure 1 :: The main features of the SF11 SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 4: Specifications Of The Sf11
Radio-frequency interference can be picked up directly on the sensor circuit electronics, the power lines and the communication lines. Ensure appropriate distance or shielding between the sensor, cables and any radio-frequency transmitter. SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 5: Quick Start Guide
PC. This provides both power and communication to the unit. 4. Start the LightWare Terminal software and click the “Connect” icon to open a communications port. The distance, analog voltage and signal strength will begin to scroll in the display window. -
Page 6: Making Connections To The Sf11
Communications using the USB port The SF11 has a micro USB port that can be used to communicate with LightWare Terminal software on a PC. This connection also provides power to the unit thereby presenting a quick way to test and configure the SF11. The LightWare Terminal software will automatically detect the USB port that is connected to the SF11 and communications can be established by clicking on the “Connect”... -
Page 7: Figure 5 :: Usb Communications
For example, to change the zero datum offset: command: #LO,0.32<CR><LF> reply: #LO,0.32 0.32<CR><LF> Figure 7 :: Serial interface connections Note: The default baud rate is 115200 bps. SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 8: Figure 8 :: I2C Interface Connections
Figure 8 :: I2C interface connections Caution Ensure that a unique I2C address is assigned to the SF11 and that no other devices share this address. SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 9: Menu Options
Product manual 5. Menu options The SF11 can be connected through the on-board USB port to a Terminal emulation program running on a PC. The LightWare Terminal software is available for download from www.lightwarelidar.com. Once the USB connection is made, the Terminal window displays the distance reading from the SF11. The distance, analog voltage or alarm status and the signal strength are displayed continually in the Terminal window. - Page 10 Menu item <h> is used to expand or hide the analog and alarm menu. The settings available in this menu relate to the linear analog voltage output and the alarm. SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com...
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Page 11: Figure 10 :: Altitude Represented By Distance (Serial / I2C) And Analog Voltage
<j> Analog range / alarm set point #OD,56.78<CR><LF> .write(13,a,b) 56.78 m write #OD,56.78 56.78<CR><LF> a = (byte)(range*100 >> 8) b = (byte)(range*100 & 0xff) SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 12: Figure 11 :: Alarm Settings
‘0’ state. The alarm switching point, output voltage range and the hysteresis can also be configured as described in the following sections. Figure 11 :: Alarm settings SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... - Page 13 = a menu item <n> Output on lost signal last ... 130 m #FL,0<CR><LF> .write(21, a) write #FL,0 0<CR><LF> a = 0 or 1 SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com...
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Page 14: Figure 12 :: Median Filter Response Graph
?FS 8<CR><LF> size = a menu item <r> Median filter size 3 ... 32 #FS,8<CR><LF> .write(27, a) write #FS,8 8<CR><LF a = 3 .. 32 SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 15: Instructions For Safe Use
Average energy per pulse < 300 nj NOHD 15 m Distance beyond which binoculars with may be used safely Figure 13 :: Labelling on the SF11 SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 16: Appendix A :: Dimensions
SF11 Laser altimeter Product manual Appendix A :: Dimensions Figure 14 :: Dimension drawings of the SF11 Appendix B :: Main cable type 1, 35 cm SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... -
Page 17: Appendix C :: Connecting To Pixhawk Autopilot Using "Serial 4
GPS and optical flow. 1. 14 kHz to 1 GHz - narrowband SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com... - Page 18 SF11 Laser altimeter Product manual 2. 14 kHz to 1 GHz - broadband 3. 1 GHz to 10 GHz - narrowband SF11 Laser altimeter - Product manual - Revision 10 © LightWare Optoelectronics (Pty) Ltd, 2021 www.lightwarelidar.com...
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Page 19: Appendix E :: Command Set
Item Type Serial menu heading ?<CR><LF> .write(‘?') .read(a, b) Model no. and firmware revision SF11/C V7 read only ? SF11/C V7 Firmware: V1.0.0<CR><LF> revision = (a*256+b)/100 Firmware: V1.0.0 ?LD<CR><LF> .write(0) .read(a, b) read only ?LD 98.67<CR><LF> distance = (a*256+b)/100 measuring screen Distance in meters 98.67 m... -
Page 20: Revision History
“0.00 V … 2.56 V” to “0.00 V … 2.048 V”. This change is applicable to SF11/B firmware revision 1.0.0, SN: S11-01500 onwards and SF11/C firmware revision 1.0.0, SN: S11-14500 onwards (pages 5, 7, 11, 12,13, 19). Updated “4. Specifications of the SF11” item “Range” to a minimum of “0.2”...