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Hiper V vs Hiper V+10 antenna model with OPUS  

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David Livingstone
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I think one thing that is confusing is the mark they have labled SHMM.  There is a little ledge on the side and it stands for Slant Height Measure Mark.  We own an earlier version of the Hiper V called a Hiper II.  They look identical.  I am assuming that adding the little pole changes the phase center somehow, but I still don't see how.

I use a 1' extension when setting up on top of a tripod, I have no clue how that affects anything but so far I don't have problems.  Like someone above noted, there are so many different poles and different ways to setup a GPS unit how can you predict how that would change the phase center.

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standing on the corner
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I am doing a 4 hour session on our local GPS on BM station today, using 2.000 m +.100 m with our other receivers (hiper II) to compare the results. 

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Aaron K Burns
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standing on the corner
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@aaron-k-burns Sorry for the delayed reply.  As of now, my testing results are inconclusive.

 

I have a current project, where we are running 4 types of receivers and digital levels.  A few more weeks and I may know something.

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tazsurveyor
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so HIPER V + 10  + NONE for this one

100mm spacer

and HIPER V + NONE for this one

glassfibre pole spacer

??

 

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standing on the corner
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@tazsurveyor Yes, that's the way I understand it.

 

 

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tazsurveyor
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I know I am late to the party. I picked up this thread in a search and there are some questions which occur to me.

The pictures I posted above are of an aluminium 100mm extension and a carbon fibre 100mm extension. There is a different consideration due to effect on the internal antenna of the metal pole extension.

For a static survey and post processing I always use the 100 extension with a tribrach and adapter.

I can use the appropriate designation.

My GPS pole is carbon fibre.

Most of the Trimble poles I have seen have an aluminium inner pole within the carbon fibre outer and I am sure there are others.

Surely the extended inner pole has an effect on the antenna height ?

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Bill93
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I’m planning an experiment to see if things under my GPS antenna affect the measurement of height. I’ll use an antenna mounted 1) close to a metal tripod, 2) with 20 cm of wood added, or 3) with 20 cm of metal tube added. It won’t be exactly on the tripod because I need a layer of masonite and a nut to hold a fixed position for the tube and wood.

Although 10 cm is of more interest on the particular antenna discussed in this thread, the additional height is a little more relevant to me because I often use either on the tripod directly or on a 2-meter metal pole. I figure 20 cm will be enough to see if there is an effect and easier than rigging 2 meters of wood.

I plan to set up two receivers (4000sse) a few feet apart, with one using a TRM14532-00 ground plane antenna as the reference and a TRM33429-00 “microcentered” as the one in each of the three positions. The choice is because I would expect more effect, if any, without the ground plane. I’ll take maybe 5 minutes in each position at 10-second rate, and process together in Topcon Tools to get vectors between them to compare the relative heights values.

If I get a significant difference then I’ll probably repeat using the 33429 as the fixed reference and moving the 14532-00 ground plane antenna, since that is the one I’ve always used for GPS on Benchmarks.

I’d rather have you throw rocks at the plan now, rather than tell me afterward that I did it wrong. How long for sessions and at what rate would you use?   Other comments?

Antenna on wood

 

Antenna on metal

 

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Bill93
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Posted by: @bill93

My conclusion is that I found no significant difference with various things under the Trimble 33429.00 "microcentered" antenna.

Measured height of the nut above an arbitrary reference:

  3 mm with 20 cm metal tube

  7 mm with 20 cm wood

20 mm antenna on nut

  8 mm antenna on nut, repeat

It turns out I set the sample rate in the wrong place in the menus and they were at 10 seconds.  I ran each session 20+ minutes, at least 120 epochs.  I barely had enough common satellites for the earlier sessions, and more toward the end.

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