Thanks Nate,
It's been a while. I remember having a back and forth discussion with Gene Kooper back in the days on the old RPLS, and he said he bought some Military surplus Gyros. I shared my experience with him and when I described the ones I used with the T-2 I told him the theodolite sat on the gyro and he said the gyro sat on the theodolite, we went back and forth for a while and he showed me a picture of this:
Which is the Wild T-16 with a GAK, to which I replied "That's not what I used", we used to have a T-2 mounted when we used the oil drum and the SIAGL apparently used a Kern, although I could have sworn it was a t-2 also. Either way they both sat on the gyro and not the other way around. I couldn't find any photos online in those days so I thought I was going crazy. I believe we're both correct because I think the British military uses The Gak.
Cheers,
Ralph
Ralph, you're correct- I made a mistake; the ABLE used the old-style T-2 while the North-Seeking Gyroscope (2nd version of the SIAGL) used the T-16.
Thank You Nate,
Happy Holidays!
Ralph
Hi,
I found this conversation online and wanted to say hello. I am the president of Zupt, LLC and we are a U.S. company based in Houston Texas (not French).
The post processed solution from inertial backpacks (B-PINS) deliver slightly worse than RTK in the woods. So at the end of say a 1.5 mile (2.5km) traverse the real time miss-closure will be on the order of 4 to 5 feet (1.5m). Using the starting control point and end control point this post processes down to a 2 sigma number for all the points surveyed of better than <+/-20cm to 30cm - or close to a foot. This is in the horizontal and the vertical. So if you have an under canopy job where this type of accuracy is acceptable then you will achieve about 4 times the productivity of conventional surveying (optical). This is a huge time saving for the land seismic stake out community who are the primary users of our products. If you require a tighter accuracy than this then keep the control closer together than 2km. We have done some civil work with our systems, some UXO demonstrations (+/-10cm required) and some underground mine work. We use the same technology subsea (offshore oil and gas survey) over much shorter offsets and deliver +/- 30mm accuracy.
Our products are used where the productivity allows the operator to realize significant costs savings. So for a 7 day project in the woods conventional techniques will be OK, us doing the work in 1 to 2 days will not really save that much. But for a 2 month job - in the woods - getting in and out in 2 weeks earns huge margin for our customers. 832 295 7280 if you need info. kv at zupt dot com.
One day, a Surveyor from Mena Arkansas, walked across a WET log, and fell in. As his equipment fell in the water, I think it ALL became inertial. 🙂
N