Choke ring antenna is a high performance GNSS antenna for base station that can track GPS, GLONASS, BeiDou, BeiDou Global and Galileo. The choke ring antenna design can meet the requirements of high precision and multi-system compatibility of measurement equipment. The choke ring GPS antenna phase center of this product has high stability and high positioning accuracy. And GNSS choke ring antennas have specially designed filters that reduce multi-path signals in the L1 and L2 bands of the same antenna configuration. Choke ring antennas are notable for their ability to reject multi-path signals from a source.
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The GPS choke ring antenna offered by Mide is a mini choke ring antenna with strong multi-path suppression performance, specifically designed for land surveying, precision agriculture, deformation monitoring, CORS and related GNSS applications require absolute positioning accuracy and multi-constellation support. These choke ring GPS/GNSS antenna details are perfectly finished and each antenna is proven to provide accurate data to meet the operator's needs and ensure stable performance over time.
- 3D chock ring structure design with excellent multipath rejection capability
- Sub-millimeter level phase center error with outstanding stability and repeatability
- Superior IP68 waterproof and dustproof level make it capable for work in harsh environment
- Mini design with Ruggedization and Durability
With multi-path suppression technology, 3D Choke ring antenna can effectively eliminate signal transmission errors. It also has anti-interference performance, which can suppress useless electromagnetic signals and prevent the receiver from being blocked by power grids, communication base stations and radio stations. Choke ring antenna features low elevation angle, high gain, good signal reception and stable phase center, which ensures sub-millimeter positioning accuracy. At present, choke ring antennas are widely used in the field of high-precision surveying and mapping, CORS station, bridge,and building deformation monitoring and geological monitoring due to its sub-millimeter phase center stability.
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A friend of mine and I are trying to build and then document in laymen’s terms, a total RTK-GPS system that will be able to do very accurate (hopefully <10 cm similar to high-end commercial systems) GPS positioning using inexpensive hardware and free software.
(see http://gpspp.sakura.ne.jp/rtklib/rtklib_releasenote.htm )
Basically, we feel as if super-accurate GPS positioning is the sort of tool that makes people have creative ideas of what they can do with that data… For example, given some time, it may be possible to -say if there is an earthquake, the earth moves… measure that change, measure continental drift… measure the rebound in formerly-glaciated areas we are seeing now after the ice age… build accurate 3D models for archaeology, etc…
It appears that the weak link in the chain for us at this point may be the antennas.
We want an accurate, low-cost antenna that is able to receive righ-hand circularly polarized signals from the entire sky at as close to a single point, electrically as possible, while rejecting reflections well. Its turning out that issues that are not important when the criteria for success is merely getting lots of satellites still make it impossible for a lot of antennas to work well in a high precision application, because they delay the signals coming from some directions enough more than others to make the fixes literally jump around a substantial amount from satellite to satellite. (if you are looking at the raw data coming from the processor)
Ground reflections, probably, are what causes the wildly jumping errors we are seeing. Some antennas (choke ring antennas) cancel them out…
We understand that both in theory and in the real world errors can be reduced to very small distances, in the real world they often are- with expensive antennas… Thats why they are expensive. The better antennas are also often relatively bulky. They have to be positioned properly, too, to actually be accurate.
What are your experiences with GPS antennas?
Yes, that makes complete sense. I would love to be able to make something like the cool novatel antenna, but its beyond my technical skills - I have a friend who I am brainstorming this with and Ive been doing a lot of reading. The best we have been able to come up with to date is a shorted annular patch antenna, a ring shape, with a hole in the middle thats shorted around its edge, sort of a very large circular via… which can be made on a PC board in a square shape… not too large. It needs two feeds at 90 degres apart, and a phasing network of some kind… still trying to figure that feed part out.
So… there are a lot of isolated geeks with the similar idea, and I think we need to get together so we can work on this as a group… I am not an RF person , I am a web person, and I am learning as I go. Luckily I think this is really interesting so thats a good motivator.
You must mean Oliver Huang of Skytraq? From the single exchange I had with him he sounded like a smart guy and I think that his products are very good. I would be surprised if I can’t do as well as receivers costing much much more, perhaps even the limit for the technology with it.
It would be great to have Skytraq give a modest level of technical support (information, not money) to the open source community… help to know what was possible… I think RTKlib is an independent project, and I get the impression they could use some more info on the Skytraq’s internal command set…
They could really turn the game around with a committment to democratize the technology… As it stands now, there are only projects like Michele Bavaro’s Yuan 10 receiver - I think he is the first to sell a product - at least in the English-speaking web, based on that chip.
But Skytraq can’t be making it for nobody, where do they go?
Its a game changer…
Two of te Ublox chips also work with RTKlib… three if you use a specific firmware version… Also there are other chips out there that let you access raw data… most more expensive or older/less sensitive I would imagine…
This post-processing/low cost DGPS meme has been building since at least . I’m sorry I went back and edited the original post, I did that because in retrospect, I thought I could have explained what I was trying to say better.
I really am just learning this… I make huge mistakes in my assumptions all the time. I am lucky that I have gotten help from people, thats been very helpful.
Its time to do this thing and get people excited about a technology that most of us only know a little, but I am starting to think, could make mathematics the new, cool gateway drug.
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