RTKLIB precision edition

Replaced simple residual ratio test by an F-TestAs soon as level of significance raises above α>85%, RTK solution type will change to the fixed state. I updated the ratio check to reflect a minimum of statistical hypothesis testing, well-knowning that state of the art is a Generalized Integer Aperture Estimation for Partial GNSS Ambiguity Fixing […]

Read More…

L2 Frequency Exploration

As mentioned earlier, a dual frequency GNSS receiver is a nice piece of hardware, but the surrounding equipment must also match. So if using Tallysman TW2712 antenna you will only be able to receive L1 frequency: Fortunately, I found a used Maxtenna M1227HCT-A2-SMA at low cost (45 €) on Ebay. As expected, the L2 frequency […]

Read More…

Continuously Operated GNSS Reference Station B35OD

Nearly nine months ago I was fascinated by the possibility of high precision position measurements using the GNSS real time kinematics technique.However I struggled with the missing driver support for my ultra-low-cost-receiver. I took this as an opportunity to improve my C language coding skills and created my first GitHub repository by forking Tim Everetts […]

Read More…

U-Blox M8T vs. Datagnss HD9310

Recently the price for the Allystar HD9310 based dual-frequency GNSS receiver dropped significantly. Compared to the well-known single-frequency U-Blox M8T receiver, the price difference is less than 50 $. Both of them are not available on the european market.In order to rule out an antenna-specific influence on the measurement results, both receivers should share one […]

Read More…

Added SiRF-Support to RTKLIB

In my last post I wrote about the opportunities of GNSS receivers based on the low cost SiRFstar chipset in comparison to the well known and famous U-Blox chipset.It seemed hopeless to wait for Mr. Illarionov to update his six year old code base and also Mr. Everett seemed to have other priorities regarding his […]

Read More…

Ultra low cost RTK-GPS

If you do not want to spend roughly 150 € for an U-Blox M8 receiver and a good Tallysman antenna you may start your experiments by using a Globalsat BU-353-S4 USB GPS Receiver which is available at Amazon for roughly 35 € (Link). Thanks to the magnet on the bottom, this device can easily be […]

Read More…

Verification of GNSS equipment

Speaking in terms of quality it is not sufficient to measure as precisely as possible. You also have to demonstrate that the equipment used is traceable down to well-known and accepted standards. How can that be achieved in terms of global satellite positioning?Well, I used my measurement equipment in connection with my personal continously operated […]

Read More…

Base Station

Geodetic Grade GNSS

Nowadays possible by using low cost hardware and ignoring the effort to get it up and running. My personal continously opereated reference station (CORS) is located onto the flat roof of my garage.The position of the base station is determined using the real-time kinematic technique and the nearest reference station KARL00DEU0 (grade A!), which is located […]

Read More…