ROMPOS F.A.Q.

ROMPOS F.A.Q.

A. Real-time ROMPOS services can be easily accessed by following these 5 steps:

1. ANCPI user account and accessing the ROMPOS administration platform
2. Payment of services
3. Defining the rovers on the ROMPOS administration platform
4. Activating a ROMPOS service subscription
5. Rover configuration

1. ANCPI user account and accessing the ROMPOS administration platform
You must have an ANCPI user account for platform authentication. People who do not have an ANCPI account can access https://epay.ancpi.ro/ that has the option to create a new ANCPI account.
The ROMPOS online service management platform can be accessed at: https://app.rompos.ro . We provide you with the following services:
1. Management of the rovers and their subscriptions to GNSS real time positioning services.
2. Downloading GNSS records from a permanent station.
3. Management of ROMPOS Credits (RTK credits and RINEX credits) for acquiring available services.

NOTE: The user and password inserted into the rover are automatically generated for each rover after its addition to the system. This operation can be performed in the Rovers section of the application. To be able to perform RTK determinations you must have an ACTIVE subscription on the rover (this is added from the Rover subscription menu).

 2. Payment of services
Payment methods details can be found here.
Case a) If payment has been successful through e-payment (epay.ancpi.ro) the credits will be available in your account within 5 minutes of payment of the services. To use them, you must log in to the ROMPOS services administration platform with the same email address and password used to purchase the services.
Attention! If you have paid e-payment there is no need to upload any proof of payment on the platform.

Case b) For payments via PO you need to upload proof of payment (scan jpg or PDF of the PO) to the ROMPOS platform in the PO registration section (pay attention to the correct selection of the service paid by PO, as well as the paid amount). The paid amount will be converted into credits within 1 day from the time we receive confirmation of the payment from the treasury, and you will receive an email notification.
PO CONFIGURATION VIDEO

3. Defining the rovers on the ROMPOS administration platform

After logging into the ROMPOS Service Management platform (app.rompos.ro) go to the ROVERS/RTK section and then the Rovers option from the left drop-down menu. To add a rover, click the Add Rover button and fill in the Rover Model and Rover Serial No. fields (this data is informative and helps you identify your equipment if you have multiple rovers). After filling in the details, save the configuration by choosing Save from the right, at which point the login data will automatically be generated to access the ROMPOS services (visible in the dedicated area called ROMPOS Account).

NOTE: If you have set up a rover and haven't enabled a subscription on it, you won't be able to connect to the NTRIP service.

4. Activating a ROMPOS service subscription

From the Rovers section pick the rover to which you want to activate your subscription, and under the Rover subscription you will be able to select the activation date as well as the number of months of subscription. ROVER CONFIGURATION VIDEO

5. Rover configuration

Before accessing ROMPOS services please check if the communication settings required for internet access have been made. It is also necessary to enter the receiver:

• The IP address of the ROMPOS server 93.113.10.123 or the equivalent domain name that is rtk.rompos.ro . (To avoid some connection issues, please use as much as possible rtk.rompos.ro instead of the IP address)
• The port for accessing the ROMPOS services, respectively 2101 for network and nearest produscts or 2105 for sigle base;
• User name and the rover’s password (from the management platform in Rovers section)

In order not to encounter connection problems we recommend that you perform a GNSS antenna reset as well as create an RTK profile from scratch. Find more details here.

B. ROMPOS services for post-processing (RINEX data)
VIDEO ON USING RINEX SERVICES

Post-processing services consist of the delivery of RINEX files for geodesic applications requiring an increased level of accuracy and reliability, such as: execution of measurements in geodesic and lifting networks, photogrammetric sighting, determination of coordinates of control checkpoints for various engineering applications, etc
RINEX files can be delivered from any ROMPOS permanent station for any given day and for any time slot specified by the user, on condition that they exist in the ROMPOS database. Also, depending on the application they are needed for, RINEX files can be delivered at various sampling rates: 1s, 5s, 10s, 15s, 30s.

The order for RINEX files is available online on the rompos administration platform https://app.rompos.ro with immediate delivery, in the RINEX section. The selection is available in UTC format (Coordinated Universal Time) LT (Local Time) = UTC-2h (winter) and UTC-3 H (summer). The files are available as full hours at the sampling rate of 1s.

To order RINEX files as time fractions (ex 12:15-13:15) or other sampling rates please fill in the data request form (http://bit.ly/GNSSf). This form is a dynamic pdf file, so it can be completed directly, and you don't need to print it. After completing the form with the required parameters (from which stations you want data, for what days, what time slots, which sampling rate and other details you find on the form), the only thing left is to place the order and to pay for the data. (for this workflow you are not paying through e-payment but only at the OCPI headquarters or to their accounts)
RINEX files offered are version 2.11 - https://kb.igs.org/hc/en-us/articles/201096516-IGS-Formats

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Before going on field work to execute the measurements required for your job, we recommend that you check the operating state of the system and the reference stations.
- accessing the http://rtk.rompos.ro link
- using a Lefebure NTRIP Client type application (that can be installed on a smartphone) which can be downloaded at: http://lefebure.com/software/ntripclient/
- by trying to access real-time positioning services with your field receiver from the area where you are located, before leaving for field work.

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Under the provisions of the order of the General Manager of ANCPI No. 16/2019 on the approval of tariffs for services provided by the National Agency for Cadastre and Land Registration and its subordinated institutions, which entered into force on 04.02.2019, the rates are as follows:

Code Term Price
1.2.6 GNSS records from a reference station 15lei/hour*
3.1.2 Real-time GNSS positioning services 100Lei/month/device or 1000Lei/year/device*

*VAT included

Payment methods:
1. Online - via the electronic payment system – e-payment of ANCPI available at epay.ancpi.ro
2. By bank transfer (payment order-PO) as follows:
to the bank account of the National Centre for Cartography RO57TREZ701501503X017556 opened at the treasury of Sector 1 Bucharest, CUI 14057015, indicating the code and name of the service.
Attention! The activation of the service will be provided within 1 working day from the date of receipt of the amount into account (when the money enters the CNC account).
In the case of bank transfer payments, the communication of the proof of payment will be made by you after you have logged into the ROMPOS service management platform (https://app.rompos.ro) in the Registration PO section.
https://app.rompos.ro/ro/contulmeu/inregistrare-plata/

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By connecting to ROMPOS reference stations in case of real time corrections or by constraining on ROMPOS stations in case of post-processing of RINEX files, the resulting coordinates for new points will be expressed in the European Terrestrial Reference System 1989-ETRS89.

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They involve the use of differential corrections from a single reference station. An example of such a product is Nearest_ 2.3, which means that differential corrections are to be accessed from the nearest reference station in RTCM 2.3 format.

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This assumes the calculation of corrections based on the observations from the nearest reference stations around the user. It is recommended that you use them if you are at large distances from any reference station or if the nearest reference station is out of order. ROMPOS offers access to 4 types of network products: MAX, iMAX, FKP and VRS. An example of a network product is RO_MAX_ 3.1 _GG, which means that a MAC product is to be used in RTCM 3.1 format, with data from GPS and GLONASS satellite constellations.

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Given that for cadastral work the coordinates of buildings must be expressed in Stereographic system 1970, ANCPI together with CNC have developed and made available to users free of charge a reliable and efficient solution for transforming ETRS89 coordinates in STEREO70 and vice versa.
This issue was solved by creating the TransDatRo coordinate transformation software, which reached version 4.05 and can be downloaded free of charge from the website www.cngcft.ro, in the "Download" section.
Also, the transformation grids related to this application can be deployed in GNSS RTK-field receivers to get the coordinates in the 1970 stereographic system in real time, without further transformations being required in the office. These transformation grids can be downloaded from the www.cngcft.ro address, the "Download" section, file TransDatRO_code_source_ 1.03
Also, for certain counties where CNC performed gravimetric measurements combined with GNSS measurements and geometric precision leveling, transformation grids were generated on altitudes based on local models of gravimetric quasigeoid.
These grids are continuously expanding and improving, therefore, for the latest news please refer to the www.cngcft.ro website under "Download" section.
The TransDatRo software also offers the possibility to transform coordinates between ETRS89 systems – Stereo30 Bucharest and vice versa and Stereo70 – Stereo30 Bucharest and vice versa, and for a detailed overview of the software, and its options and capabilities, we recommend that you read the Help section of the software.

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Current configurations of GPS and GLONASS systems allow GNSS determinations to run at any time. Weather conditions can adversely affect the satellite signal, most of the times the influences being insignificant. To view real-time troposphere influence on metrics, go to the NOVA MAPS view the quality graphics.

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On the ROMPOS service management platform you will need to add each rover to the Rover section. For each rover, a user and password will be allocated automatically when a subscription is activated for that rover.

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If you don’t get a fix solution although you are connected to the ROMPOS server check:
- if you have a data signal in the work area and its quality;
- if the settings were correctly made in the device;
- if all reference stations in the area are functional. If you are trying to use a Single Base product by accessing a non-functional station, please try accessing another nearby station or accessing a Network RTK product. For the description of Single Base products and Network RTK see the answers in this section by accesing the links.
- if there are no jamming or reflective sources in the area where you are working, that may affect the quality of radio signals (both satellite and mobile signal networks). In such situations, please also try the alternative use of several real-time products.

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1. If the modem is in the receiver. Most GNSS systems use the 2G mobile data connection. Connection problems are inherent to any mobile network, since 2G technology is old and 3G, 4G and voice connections have priority when the network is overworked. The solution would be to contact the mobile provider to reset the SIM or relay in the area while your GNSS equipment is on. This problem does not manifest when the SIM is in the controller.

2. Connection problems, the base is not loaded and the rover remains in standalone mode. The first step is to reset the receiver (Stonex, South, Trimble) by holding down the power button until activation of the restart sequence on/off/beep, and all LEDS fluctuate/LEDS remain lit.

The second step is to create a new profile (existing profiles are deleted) to connect to ROMPOS via ntrip. At ntrip server/DNS enter rtk.rompos.ro or 93.113.10.123, the port is 2101 and the user and password are retrieved from the app.rompos.ro/rover interface.

After connection the solutions offered in the ROMPOS corrections table should be the following *.

RO_MAX_3.1 recommended solution
RO_VRS_3.1
RO_iMAX_3.1
Nearest_3.1 direct connection to a reference station (< 30km recommended)
Nearest_2.3 recommended for equipment using RTCM 2.3
RO_FKP_3.1
RO_i_MAX_2.3 recommended for equipment using RTCM 2.3
RO_FKP_2.3 recommended for equipment using RTCM 2.3
*Mandatory, the receiver will have to transmit the coordinates of the station point (by NMEA-GGA type message)

NOTE: If you try to activate in a crowded area with 4G/3G signal, try activating in a less crowded area (township, surrounding area, etc.)

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To access real-time ROMPOS services you need GNSS RTK receivers for geodesic applications that have the necessary communications equipment for internet access through a data subscription to one of the mobile operators in Romania.
We recommend the purchase of equipment only from authorized distributors, who have all the necessary certifications to market such equipment and provide warranty and technical support necessary for the purchase of optimum equipment for your needs, and their subsequent configuration to access ROMPOS services.

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Currently, any mobile operator on the Romanian territory can provide data subscriptions through which you can access ROMPOS services.

When purchasing a data plan, we recommend that you consider both the data coverage range of that operator in your area of interest (in which you will execute the most works) and the quality of the data signal and connection stability.

Note that a distorted or interrupted data signal may result in problems fixing solutions during the execution of field measurements.

Regarding the traffic that is reflected in the amount of data required, we inform you that an hour of access to RTK services through the RTCM protocol version 2.3 or CMR assumes a traffic of about 0.5 MB of data.

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To extend your subscription to ROMPOS services you will need to sign in to the ROMPOS service administration platform https://app.rompos.ro . The only procedure to be followed in this case is described below (you must not interfere with the physical rover configuration, user and password remaining the same).

  • After authentication, go to the ROVERS/RTK section. Also check if you have the credits available for ROVER (1 credit = 1 month), information located in the status bar at the top right.

Screenshot 2

  • Then go to the Rovers menu on the left. You can extend the period of an already active Rover or activate an inactive rover. To access the rover details, click on the green icon.

Screenshot 21

  • To see the subscription details go to the Rover Subscription tab.

Screenshot 3

  • To activate or extend a subscription click the Start Date field and choose the starting date from the calendar by clicking on it.

 

Screenshot 4

  • Enter the number of months you want for your subscription and go to Add Subscription.

Screenshot 5

  • Check the correctness of the data in the warning message and if they correspond to your option, go to the Yes button.

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  • You will receive a notification if the transaction is successful. If errors occur in this process, the credits are returned to your account.

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  • The new subscription will be visible in the Rover Subscription tab of that rover.

Screenshot 8

  • If the starting date corresponds to the current date it will change the subscription activation status with the period in which the subscription is active, and if the activation date is in the future the subscription appears as inactive.

Screenshot 9

 

 

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You must acknowledge that real-time measurements using GNSS technology may be affected by a number of factors that are not under the control of the operator performing the measurements or the reference station network administrator.
Examples of such external factors can be:
- false information in messages transmitted by GNSS satellites. There are (very rare) situations where, at some point, one or more satellites in a particular constellation can transmit false information. Errors caused by satellite orbits or clocks may usually occur. More information about satellite constellations and the status of their satellites can be found by visiting the websites dedicated to satellite navigation systems, respectively for the NAVSTAR GPS System https://www.navcen.uscg.gov/?Do=constellationStatus, for the GLONASS System https://www.glonass-iac.ru/en/GLONASS/, for the GALILEO System https://www.gsc-europa.eu/system-service-status/constellation-information, and for BeiDou ttps://www.glonass-iac.ru/en/BEIDOU/
- reflections of satellite signals, an effect described in the specialty literature as "multipath". This involves the reception by the rover antenna of additional signals, reflected by flat surfaces or other objects nearby, such as: concrete or metal walls, metal roofs, metal pillars, water gloss, etc.;
- possible jamming sources in the area, such as: transformer stations, high or medium voltage lines, various high-power emission antennas (radars, GSM relays, radiocommunications, etc.);
- atmospheric disturbances, the ionosphere in particular. These can be checked by accessing the following link: https://rompos.ro/index.php/en/technical-info/nova-maps
- possible malfunctions of one or more GNSS reference stations in the area at the time. The functionality of server communications and GNSS reference station communications can be verified by accessing the following link: http://rtk.rompos.ro/.
Also, a possible incorrect setting of the rover should not be ruled out. In this respect, it is useful to recheck the settings of the device and eventually reconfigure the NTRIP profile.
Regarding the problem of solution fixing, please also read the information in the link: https://rompos.ro/index.php/en/f-a-q/rompos-f-a-q/i-can-t-connect-the-gnss-equipment-to-rompos-what-could-be-the-cause

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Base station coordinate accuracy

The base station coordinates should be known to within 10 m in the WGS-84 datum for optimal system operation. Incorrect or inaccurate base station coordinates degrade the rover position solution. It is estimated that every 10 m of error in the base station coordinates introduces one part per million error in the baseline vector. This means that if the base station coordinates have a height error of 50 m, and the baseline vector is 10 km, then the additional error in the rover location is approximately 5 cm, in addition to the typical specified error. One second of latitude represents approximately 31 m on the earth surface; therefore, a latitude error of 0.3 seconds equals a 10 m error on the earth’s surface. The same part per million errors apply to inaccuracies of the base station’s latitude and longitude coordinates.

Number of visible satellites

A GNSS position fix is similar to a distance resection. Satellite geometry directly impacts on the quality of the position solution estimated by the receiver. The Global Positioning System is designed so that at least 5 satellites are above the local horizon at all times. For many times throughout the day, as many as 8 or more satellites might be above the horizon. Because the satellites are orbiting, satellite geometry changes during the day, but repeats from day-to-day.

A minimum of 4 satellites are required to estimate user location and time. If more than 4 satellites are tracked, then an over-determined solution is performed and the solution reliability can be measured. The more satellites used, the greater the solution quality and integrity.

The Position Dilution Of Precision (PDOP) provides a measure of the prevailing satellite geometry. Low PDOP values, in the range of 4.0 or less, indicate good satellite geometry, whereas a PDOP greater than 7.0 indicates that satellite geometry is weak.

Even though only 4 satellites are needed to form a three-dimensional position fix, RTK initialization demands that at least 5 common satellites must be tracked at base and rover sites. Furthermore, L1 and L2 carrier phase data must be tracked on the 5 common satellites for successful RTK initialization. Once initialization has been gained, a minimum of 4 continuously tracked satellites must be maintained to produce an RTK solution.

When additional constellations such as GLONASS are tracked, one of the satellites will be used to resolve the timing offsets between that constellation and the GPS constellation. Tracking additional satellites will aid in the RTK solution.

Elevation mask

The elevation mask stops the receiver from using satellites that are low on the horizon. Atmospheric errors and signal multipath are largest for low elevation satellites. Rather than attempting to use all satellites in view, the receiver uses a default elevation mask of 10 degrees. By using a lower elevation mask, system performance may be degraded.

Environmental factors

Environmental factors that impact GPS measurement quality include:

  • Ionospheric activity
  • Tropospheric activity
  • Signal obstructions
  • Multipath
  • Radio interference

High ionospheric activity can cause rapid changes in the GPS signal delay, even between receivers a few kilometers apart. Equatorial and polar regions of the earth can be affected by ionospheric activity. Periods of high solar activity can therefore have a significant effect on RTK initialization times and RTK availability.

The region of the atmosphere up to about 50 km is called the troposphere. The troposphere causes a delay in the GPS signals which varies with height above sea level, prevailing weather conditions, and satellite elevation angle. The receiver includes a tropospheric model which attempts to reduce the impact of the tropospheric error. If possible, try to locate the base station at approximately the same elevation as the rover.

Signal obstructions limit the number of visible satellites and can also induce signal multipath. Flat metallic objects located near the antenna can cause signal reflection before reception at the GPS antenna. For phase measurements and RTK positioning, multipath errors are about 1 to 5 cm. Multipath errors tend to average out when the roving antenna is moving while a static base station may experience very slowly changing biases. If possible, locate the base station in a clear environment with an open view of the sky. If possible use an antenna with a ground plane to help minimize multipath.

The receiver provides good radio interference rejection. However, a radio or radar emission directed at the GPS antenna can cause serious degradation in signal quality or complete loss of signal tracking. Do not locate the base station in an area where radio transmission interference can become a problem.

Operating range

Operating range refers to the maximum separation between base and rover sites. Often the characteristics of the data link determine the RTK operating range. There is no maximum limit on the baseline length for RTK with the receiver, but accuracy degrades and initialization time increases with range from the base. Specifications given for receivers specify the distance within which those specifications are valid, and specifications are not given beyond that range.

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  • Schedule M-T : 8:00-16:30; F: 8:00-14:00
  • 1A Expozitiei Bvd., Sector 1, Bucharest
  • +40 21 224 39 67
  • office@rompos.ro
  • Fast contact