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Real Time Kinematic and Post Processing Kinematic subscriptions

Whether you need real-time precision geolocation in the field, or post-processing, we have the right service to match your equipment.

Unlimited RTK subscription

800€ excl. VAT/year*

Unlimited use throughout mainland France, excluding Corsica.

You will need this subscription to have the centimetric position of your receiver in real time, in the field, without having to install your own base station. Subscribe with us your annual contract for access to RTK full GNSS corrections. You will then have a login and password to enter in the connection parameters of ReachView, Emlid’s free application.

Grant an independent connection via SIM card

Optionally, you can order a SIM card to be inserted into the Reach RS2. This will be useful if you wish to grant an independent connection to the Reach RS2. Otherwise, to receive RTK corrections, you can just use the connection sharing of your smartphone.

*Available only when purchasing a GNSS Reach RS2 receiver from the FB Store. For owners of a Reach RS2 purchased from the FB Store, please contact us.

RTK Subscriptions of FB SOLUTIONS

Unlimited PPK subscription

450€ excl. VAT/year*

Unlimited use worldwide

You will need this subscription to have the centimetric position of your receiver in post-processing. Subscribe with us to your annual access contract to the PPK calculation service, directly accessible in your customer area. In the field, remember to start recording the raw data in RINEX format. This can be done in ReachView, Emlid’s free application, in just a few clicks.

*Available only when purchasing a GNSS Reach RS2 receiver from the FB Store. For our users who already own a Reach RS2, please contact us.

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PPK Subscriptions of FB SOLUTIONS

450.00 excl. VAT / year

Compatible GNSS receiver

Discover the Reach RS2 in our online shop.

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1,745.00 excl. VAT

Further information

FB store subscriptions subject to the purchase of a Reach RS2 receiver. Each of the RTK subscriptions offered by FB SOLUTIONS is linked to the unique serial number of your equipment.

Our GNSS subscriptions are only available as an option with the purchase of a Reach RS2 GNSS receiver from the FB Store. For our users who have already ordered a Reach RS2 on the FB Store or for professionals who want an RTK subscription without buying a Reach RS2, please contact us.

Technical details related to our GNSS subscriptions

RTK and PPK are so-called “differential” positioning modes. They allow a receiver, called “mobile”, to be precisely positioned relative to a second, stationary receiver, called “base”. By processing the satellite observations of the base and the mobile, the 3D vector between the two can be calculated with a precision ranging from a few millimetres to a few centimetres.

In this way, if the coordinates of the base are known precisely, those of the mobile can be deduced by adding the components of the 3D vector calculated by differential GNSS to the coordinates of the base.

Need more information?

Do not hesitate to contact our team for more information about our GNSS subscriptions.

What is Real Time Kinematic and Post Processing Kinematic?

Real-time positioning

When this processing is done live in the field by the mobile phone, we speak of “real time” positioning, or more commonly “RTK”, for Real-Time Kinematic. RTK is nowadays the most widespread means for centimetric GNSS positioning.

In order to enable this real-time positioning, it is necessary to process satellite observations from the base station and those from the mobile at the same time. Traditionally, to achieve this, a telecom link is set up between the two receivers so that the mobile is able to do the processing itself.
The classic method of communication is radio: the base transmits its observations and the mobile receives them, with the presence of a transmitter/receiver at the base and at the mobile. Radio has the advantage of being simple to set up, but has the disadvantage of having a range limited to a few kilometres, of being quickly degraded by the presence of obstacles such as buildings, and of being sensitive to interference.

The NTRIP protocol

Instead of radio, a protocol based on Internet communication can be used: NTRIP (pronounced “N – trip”, for Network Transport of RTCM by Internet Protocol). In this case, the base station, which has the role of a so-called “NTRIP Server”, sends its observations to a third party server, whose role is called the “NTRIP Caster”. The mobile phone, in its role as “NTRIP Client”, retrieves the base’s observations from the NTRIP Caster.

This method has the disadvantage of being dependent on a GSM/3G network in the field, but is much more secure than radio because authentication is required to connect to the NTRIP Caster. Moreover, there is no longer any range constraint, except for the one that degrades the accuracy of the calculated base – mobile vector, i.e. a few tens of kilometres.

The Reach RS2, ideal for classic RTK

In order to do RTK, a GNSS base has to be installed, and put it on a very well known point in coordinates. This is what we call the “classic RTK”. The Reach RS2 is one of the only GNSS receivers in the world that can do radio and NTRIP, that can be used both as a base and as a mobile, and that can act as NTRIP Server and NTRIP Client. It has been designed to meet all possible use cases. Emlid has also created a free NTRIP Caster to connect its base and mobile via NTRIP.

The Network RTK

It is possible to do RTK without having to manage one’s own base, but using an already deployed network. This is the NRTK, for “Network RTK”. Some countries have a public network, but most of these networks are managed by private companies.

In this case, the observations sent to the mobile are generated from a network of permanent GNSS stations, installed at regular intervals on the territory. Thanks to this mesh, it is possible to model the path lengthening affecting the GNSS signal between the satellite and the ground, or “measurement errors”. In this way, the GNSS network calculation server is able to model the GNSS measurement errors at any location, and can therefore deduce the value of the GNSS observations that would have been picked up by a receiver installed at any location. It is then able to generate so-called “virtual” observations within its mesh. The mobile thus retrieves from the network’s NTRIP Caster the observations of a virtual station located right next to it, thereby guaranteeing a small distance between the base and the mobile. A virtual base station is commonly called “VRS”, for Virtual Reference Station.

Post-Processing Kinematic

PPK, for Post-Processing Kinematic, is the method of differential positioning of a mobile in delayed time.
For technical reasons – it is impossible to have a telecom link between the base and the mobile – or for usage reasons – for example the position of an aerial UAV using photogrammetry does not need to be precisely known in real time, as the deliverable is necessarily obtained during a post-processing phase – PPK is an alternative to real time to calculate a precise position or trajectory. In some cases, it also serves as a means of controlling the RTK.

In the case of PPK, it is not the mobile itself that performs the position calculation, but a calculation server. This server has the raw GNSS observations from the base and the mobile on a common set of satellites, over a common time session. It applies a differential positioning algorithm to these data to obtain the position of the mobile. The raw input data are recorded in the field in RINEX format, the world standard, or in a proprietary format specific to the receiver. Emlid receivers can record in RINEX or UBX, the u-blox format. These files are perfectly managed by our RINEX PPK service, which allows users to do their PPK processing online.

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