Discussions

Toughts about Rangefinder

Posted by Pedro Henrique R. P. B. Silva on January 30, 2017 at 12:03pm

Hello, guys

I'd like to know what are your experiences using Lightware and TeraRanger rangefinders.

I know they have different sizes and different operational voltages also.

But which of them is more precise and realible for landing?

I'm always flying over trees and grass, so using a sonar is not something I am considering.

Thanks for your thoughts.

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Replies

  • Socratic April 18, 2018 at 8:37am

    We are having difficulties getting SF/11c to work properly with Pixhawk.  When plugged in we are getting oscillating altitudes in loiter and alt hold.  These variations in altitude are quite abrupt and are around 5-10 meters in variation.  If we unplug the rangefinder, bird flies fine.  Plug it back in and it bounces.  We have double and triple checked parameters but cannot narrow down issue.  Anyone have any ideas?  Thanks. 

  • Cala February 4, 2017 at 2:55pm



    Olivier said:

    +1

  • Olivier February 4, 2017 at 11:20am

    I've been flying Lightware's SF11 series on Pixhawk 1 on copter. A breeze to install, five minutes and absolutely plug and play with a  few clicks to configure with Ardupilot and Mission Planner. Works flawlessly, including automatic switch to barometer when out of range at higher altitude. Alt hold mode a foot off the ground at good speed on up and down sloping terrain no problem.

  • LightWare - Laser Developer January 31, 2017 at 4:37am

    @Pedro - The expert on this subject is Dr Andrew Tridgell. You can find him on this forum here or drop a question onto the ArduPilot development forum here.

  • Pedro Henrique R. P. B. Silva January 31, 2017 at 4:28am

    Hello!

    Do you know someone who has used it to precisely land fixed wings? Do you know their experience?

    Thanks in advance!

    Laser Developer said:

    Hi Pedro - I work for LightWare and we supply lots of SF11/C and SF10/A rangefinders for use during final approach and landing. These products measure trees and grass reliably.

    Unfortunately I can't comment about other products to give you a comparison, but perhaps you could take a look at Cala's blog here to get an independent review of the SF11/C.

  • Greg Watts January 31, 2017 at 4:27am

    Hi Pedro - Greg here from Terabee, makers of the TeraRanger sensors. We also have many drone users using our sensors as a precision altimeter. What they tell us they like is the low weight (only 8g) and small size and the plug and play simplicity, as well as the fast update rates (upto 1000 times a second in Fast mode). Trees and grass etc are no problem and in fact our 3 degree FoV can often be an asset in these situations. A number of use case videos can be found here. - Clearly we are happy to help with any questions you may have. Contact details are on the contact page of www.teraranger.com. Best regards. Greg.

  • LightWare - Laser Developer January 30, 2017 at 9:59pm

    Hi Pedro - I work for LightWare and we supply lots of SF11/C and SF10/A rangefinders for use during final approach and landing. These products measure trees and grass reliably.

    Unfortunately I can't comment about other products to give you a comparison, but perhaps you could take a look at Cala's blog here to get an independent review of the SF11/C.

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