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Stephen Jack
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  • Lorient
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Open source RTK GPS program package
1 Reply

Started this discussion. Last reply by Mike Sep 18.

Boat Navigation

Started Mar 20

Hudson River Crash / Bird Impacts & UAV

Replied Jan 21

 

Stephen Jack's Page

Latest Activity

Stephen Jack commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
Jack count to ten breath in and out slowly. (Paparazzi wiki) “Sourcing from u-blox u-blox keeps tight control over the distribution of their products. They must be obtained DIRECTLY from their own reseller offices. These offices may not be availabl…
November 17
Jack Crossfire commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
This was too good to be true. The only uBlox chip which generated the required raw measurement data was the uBlox 4 specifically in the LEA-4T package. The uBlox 5 has that disabled & my uBlox 4 is a NEO-4s. Obviously they disabled raw measurement s…
November 16
Marty commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
Keep in mind that one of the major outcomes of this experiment was replacing the standard antennas with geodetic grade ones. So even if the equations can be applied successfully to our application we will still need to find a suitable antenna.
November 13
Mike commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
Doug, two RTK GPS units are commonly used in the marine industry as compasses for multi-beam bathymetric surveys and for DP (dynamic positioning) for dredgers and other vessels - similar to position hold. I haven't heard of them being used for attit…
November 13
William Premerlani commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
Doug, The method that Takasu has developed uses a single GPS to determine very accurate location by combining both modulation and Doppler shift information. It does not get attitude. Bill
November 12
Jack Crossfire commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
The supported GPS modules are given on http://gpspp.sakura.ne.jp/rtklib/rtklib_releasenote.htm uBlox 4 & 5 are supported. No Locosys or Sirfstar of course. He said he got 1cm accuracy in 3 dimensions. He also overclocked the uBlox 4 to 10Hz by pro…
November 12
Doug Weibel commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
Is RTK the system that allows you to get attitude from gps? I saw some info from a vendor somewhere offering such a system. It consisted of three gps receivers that used a common clock and were physically separated by some distance (think full size…
November 12
William Premerlani commented on Stephen Jack's blog post 'If you are interested in RTK GPS this is for you'
@Jack, Are you suggesting it may be feasible to use a uBlox to implement Takasu's method? Can that be done by simply reprogramming the uBlox? The math certainly looks interesting, and the measured performance is impressive. Bill
November 12

Profile Information

About Me:
I started flying RC gliders in the early 1990s then had a period of about 15 years doing other things. I became interested in RC gliders again in 2007 and built several battery operated versions for taking aerial photographs. I learnt to fly again using the EasyGlider but I now use one of my own designs which is easier to handle and has move room for electronic equipment than the EasyGlider. I have a new model under development which has increased space, perfect for a UAV perhaps.
Hometown:
Lorient

Stephen Jack's Blog

Stephen Jack

If you are interested in RTK GPS this is for you

These are the most important papers I've read with regard to RTKGPS, they are also bang upto date. It is worth spending time study the tables.

T.Takasu and A.Yasuda, Development of the low-cost RTK-GPS receiver with an open source program package RTKLIB, International Symposium on GPS/GNSS, International Convention Center Jeju, Korea, November 4-6, 2009 (rev.A submitted)

http://gpspp.sakura.ne.jp/paper2005/isgps_2009_rtkl… Continue

Posted on November 12, 2009 at 12:44pm — 10 Comments

Stephen Jack

Walkabout Mode in which versions?

"ArduPilot's vehicle (car or boat) mode can also be used for ground testing aircraft navigation or as a simple navigation-only autopilot for aircraft with a separate stabilization system to provide a full autopilot solution. It is enabled by selecting "Walkabout mode" in the configuration settings."

Which versions of ArduPilot have Walk about mode? Thanks

Posted on November 9, 2009 at 11:30pm — 2 Comments

Stephen Jack

The Autonomous Treasure Hunter

Introduction

It's 33 degrees in the shade, I'm on holiday and everyone keeps asking what am I scribbling and why? Why, well when you post notes and ideas up on the net it can open up avenues you had never even thought of, and thats ultimately where these bits of paper are heading. The what, this is a little more complicated.

A few years ago I became focused on treasure hunting and have wondered how you can change the odds of success, is it possible to locate treasure using maths and sci… Continue

Posted on August 16, 2009 at 1:00am — 5 Comments

Stephen Jack

GPS base stations

A few years ago I use to do a large amount of GPS work, using Topcon base stations with Leica Rovers. The Topcon base was cheaper than the Leica alternative, but still they cost several thousand dollars. I would like to use a base station to have sub meter accuracy of an autonomous vehicle and also to be able to post process recorded data. The budget I have does not stretch to 1000s of dollars, at best maybe I could manage a few hundred, is it therefore possible to develop a base station for thi… Continue

Posted on July 14, 2009 at 2:30pm — 23 Comments

Stephen Jack

Throttle Control

Just read through the post about 2.1 code upload looking for throttle control info. What I found their relates to airspeed. Are there currently any options to allow throttle control via GPS as I am building an autonomous trimaran. The speeds I want run it at are in the 1-3 km range.

Posted on April 22, 2009 at 1:13pm — 19 Comments

Comment Wall (3 comments)

At 8:06am on January 12, 2009, Kedar Kulkarni said…
Extremely sorry!
We had taken a short break and ar e back just today..
I will like to help you with LIDAR.
I will talk to a the teammate working on it and get back to you in two days!
Sorry again!
At 1:13am on January 13, 2009, Kedar Kulkarni said…
our LIDAR sensor is a 160 gm sensor whcich will be mounted on a quad copter.
Its job is to plot 2d "nearness diagram" which will be one of the navigational aids.
I will get you the specifications.
At 6:37pm on August 15, 2009, Joseph Glanville said…
Hi!
Sorry things have been hectic wirh uni atm,
I haven't abandoned the idea yet, just taken a backseat for a while.
Hopefully will have some more time soon to play.

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