The Regional Center Point Group In this article we discuss the various regional centering controls used in the Nearest MountPt Dialog. The regional center point is used to constrain the location of the Base Stations which will form the NEAR pool to being within a defined region. This allows operating […]
Nearest MountPt, Distance Values
The Distance Settings Group In this article we discuss the various distance controls used in the Nearest MountPt Dialog. The distance settings are used to control how far away a given rover can be (the resulting single baseline between it and the base station) and also how sensitive the process […]
Nearest MountPt, Stream Contents
Stream Contents Group In this article we discuss the various stream content filtering controls used in the Nearest MountPt Dialog. The required stream content section provides a means to select only those Base Stations that provide certain data types to be considered for a given NEAR pool. The primary use […]
Nearest MountPt Dialog
In this article the various settings found in the Nearest MountPt Dialog are discussed. This dialog controls how a NEARest data stream is configured on a SNIP node and therefore which of the other Base Stations will make up the pool to which an NTRIP Client may be connected. A […]
Release 1_02_0 Changes
What is new in the SNIP 1_02_0 release [January 13th 2017] This is another minor service release of SNIP following after the rev 1_1_0 release of last month (December 2nd). It is recommended for all users and is now the primary download. At this writing, SNIP is now being used […]
Nearest MountPt, use case examples
This article provides a few practical details and comments on setting up a NEARest data stream on a SNIP node. It follow another article which serves to introduce the new NEARest mountPt feature in SNIP. For this article we have used the remote-relay mode to connect a SNIP node to […]
Precise Distances Over the Ellipsoidal Surface
Here is the link you were looking for: http://www.movable-type.co.uk/scripts/latlong-vincenty.html This is your go-to friend for how to make precise computations with Ellipsoidal Surfaces You will find several other useful utilities at that site as well. If you are a master of RTK methods you probably already know this stuff. If […]
When a Caster table entry is incomplete
There are several possible reasons a given Caster Table entry may appear to be empty or missing key data. This article covers the process of setting up Caster Table entries in greater detail. As a broad rule, you only need to provide these details for your serial port connections and […]
Can RTKLIB and SNIP be used on the same machine?
Yes! There are not any problems or conflicts with doing this. And in fact you can run multiple copies of RTKLIB on the same node as SNIP is running. This can be of value when you are using the native ability of RTKLIB to translate a vendors propriety GNSS format […]
Nearest MountPt Use
The use of “NEAR” mountPt feature (default name: NEAR2 and NEAR3 for RTCM2 and RTCM3 data streams) can be used to allow your NTRIP Clients to easily connect to the closest operational base station without having to examine the contents of each entry found in the Caster table. The NEAR […]
Ganged Testing with uBlox6T
This article first appeared in the forum topics of the original knowledge base support site. Here are some interesting static results from testing six identical uBlox6T units to determine the level of unit-to-unit repeatability achievable under ideal static conditions (strong signals, short baselines). The bottom line: The behavior of the […]
What is inside a uBlox6T evaluation model
This article first appeared in the forum topics of the original knowledge base support site. The uBlox 6T is a popular L1 only chip set used by many for short baseline RTK work. Prices for these devices range from just over ~125 US dollars to about ~350 in single quantities […]
Using NTRIP Clients vs using TCP Clients
Data Users often get confused on the subtle differences between various connection types. In the thread below a user is connecting to a Caster with a TCP connection in one case and with the NTRIP protocol in another. The only reason to use TCP for such a thing is that […]
Where do I get a free NTRIP Client?
See also: this knowledge base article for more NTRIP Client sources. From many sources, as seen in the list below. Unlike deploying reference stations (so called NTRIP Servers) which can be very costly, (and NTRIP Casters other than SNIP often cost thousands), as a rule NTRIP Clients are typically provided […]
Converting ECEF to LLH and back
One often has to convert between the X-Y-Z coordinate values of the ECEF system and the ellipsoidal values of Lat and Long (and height above the reference ellipsoid) system. You can easily find source code to do this on the web. But often you just need a quick conversion. Watch […]
Signs for testing w/ Vehicles
Here are some useful images for placards you may want to place on the sides of your test vehicle for the safety of your team and the public. We have gotten requests for these images over the years from other researchers, so we place them up on the site. There […]
Converting NAD83 to WGS84
Here is the link you were looking for: http://geodesy.noaa.gov/cgi-bin/HTDP/htdp.prl?f1=4&f2=1 This is your go-to friend for your NAD83 -> WGS84 converting needs! You will find several other useful utilities at that site as well. Hint: When creating a base station location, you MUST convert your base station antenna position to […]
Post-processing your measurements by OPUS and others
Need to locate your base station? In order to setup your base station you will need its precise location, expressed in ECEF (Earth Centered, Earth Fixed) coordinates, not in NAD-83, WGS84 or any other local datum. This is typically done by the collection of several hours of data and some […]
SBAS, DGPS, and RTK, some relative plots
Folks often ask for a typical plot set between these different methods. While this is no such thing a typical GNSS day, we hope this will serve the need. Here is a simple plot (using RTKLIB and one of our reference stations, with L1 only ) that clearly shows the […]
Does my RINEX file have carrier data in it?
Background: Without both code and carrier data, RTK and PPP navigation methods are not possible. While it is routine to have both (as well as other signals) in better modules and chips, some very low end chip sets do not provide a carrier output. This basically kills any ability to […]