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MINISTRY OF
NATURAL RESOURCES AND ENVIRONMENT
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SOCIALIST
REPUBLIC OF VIETNAM
Independence – Freedom – Happiness
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No.
03/2020/TT-BTNMT
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Hanoi, May 29,
2020
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CIRCULAR
TECHNICAL REGULATIONS ON NATIONAL SATELLITE NAVIGATION
NETWORK
Pursuant to Law on Surveying and Mapping
dated June 14, 2018;
Pursuant to Decree No. 27/2019/ND-CP dated
March 13, 2019 of Government on elaborating to Law on Surveying and Mapping;
Pursuant to Decree No. 36/2017/ND-CP dated
April 4, 2017 of the Government administering functions, tasks, powers, and
organizational structure of Ministry of Natural Resources and Environment;
At the request of Director General of
Mapping, Survey and Geographic information Agency, Director General of
Department of Science and Technology and Director General of Department of
Legal Affairs;
Minister of Natural Resources and Environment
promulgates Circular on technical regulations on national satellite
navigation network.
Chapter I
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Article 1. Scope
This Circular prescribes technical requirements
for national satellite navigations in survey and mapping.
Article 2. Regulated
entities
This Circular applies to regulatory authorities,
organizations and individuals involved in developing national satellite
navigation network; provision and use of national satellite navigation network
in survey and mapping.
Article 3. Definitions and
abbreviations
1. Term interpretation
a) Real-time kinematic (RTK) service provided by
national satellite navigation network: refers to a service capable of providing
data corrections processed by at least 3 national satellite navigation stations
to serve survey and mapping with accuracy in cm in real time;
b) Data Sampling: refers to a period of time (in
second) during which the measurement is recorded in memory of the reception
apparatus;
c) Antenna mount: refers to an accessory to
install the antenna fixed to the base section, capable of stabilizing and
allowing adjustment of direction of the antenna, usually premade according to
international standards;
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2. Abbreviations
a) GNSS: Global navigation satellite system;
b) GPS: Global positioning system developed by
the US;
c) GLONASS: Global navigation satellite system
developed by Russia;
d) GALILEO: Global navigation satellite system
developed by the EU and operated by the European Space Agency;
dd) BDS (BeiDou Navigation Satellite System):
Global navigation satellite system developed by China;
e) (Quasi-Zenith Satellite System): Navigation
satellite system developed by Japan operating mainly in Asia – Australia;
g) IRNSS (Indian Regional Navigation Satellite
System): Regional navigation satellite system developed by Indian Space
Research Organisation;
h) IGS (International GNSS Service):
International organizations providing services related to the GNSS system;
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k) RINEX (Receiver Independent Exchange forma):
Standard GNSS data following ASCII data format to facilitate processing
independent of reception apparatus or software;
l) VRS: Virtual reference station;
m) MAC: Master-Auxiliary concept;
n) MAX: Correction service utilizing MAC
technology solution;
o) i-MAX: Correction service utilizing MAC
technology solution corrections;
p) Single Base: Correction service utilizing
single base technology solution;
q) RTCM (Radio Technical Commission for Maritime
services): Standard data structure for correction transmission developed by the
Radio technical commission for maritime services;
r) DVR (Digital video recorder): An electronic
device capable of receiving signals from digital camera for processing and
recording images in real time;
s) FTTH (Fiber to the Home): Simple cable
connection solution transmitting directly from network providers to households
or organizations;
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u) LAN (Local Area Network): refers to a network
system for connecting computers in a small scale.
Article 4. General
regulations on national satellite navigation network
1. The national satellite navigation network
consists of national satellite navigation stations and central control and
processing center connected via internet to ensure continuous and stable date
receipt.
2. The central control and processing center
consists of data center and operating rooms connected with each other via LAN
capable of processing, calculating and providing services serving survey,
mapping, highly accurate navigation and scientific research.
3. The national satellite navigation network is
developed simultaneously and nationwide in VN-2000 national coordinate system,
national altitude system; calculated by determining coordinate regularly and
continuously on a daily basis in the ITRF; with gravity value and fluctuation
of gravity value determined once every 10 years.
4. Geoid model serving determination of
orthometric height is the Geoid model developed conforming to Vietnam territory
and publicized by Ministry of Natural Resources and Environment at the same
time as providing services of the national satellite navigation network. Orthometric
height (h) = H – N (in which H refers to ellipsoid height, N refers Geoid
deducted from the aforementioned Geoid model).
5. Some coastal national satellite navigation
stations must be connected with the nearest oceanography stations to monitor
sea level to service establishment of national altitude systems, improve the
Geoid model and monitor rise of sea level.
6. The national satellite navigation network
must be able to be expanded and upgraded to satisfy use demand and
compatibility with technical and technology infrastructure of currently active
satellite navigation systems around the world.
Chapter II
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Article 5. Overall design of
national satellite navigation station
1. National satellite navigation station
consisting of 2 types designed according to use purposes as follows:
a) Continuous operating reference stations:
distributed evenly nationwide, with average distance between stations of 150 km
– 200 km, used as the national coordinate reference, scientific research and
serving survey and mapping. Positions of 24 constructed continuous
operating reference stations 999re displayed under Annex 1 of this Circular,
from 1 to 3 stations among which participate in the IGS network;
b) Continuous operating stations: positioned in
between continuous operating reference stations with average distance between
stations of 50 km – 70 km, this distance may be increased up to 100 km.
Continuous operating stations combine with the continuous operating
reference stations to create national satellite navigation network capable of
providing navigation services in real time with accuracy in cm and meeting most
of accuracy requirements in survey and mapping.
2. The design process must prioritize
installation in areas already equipped with infrastructure such as natural
resource and environment monitor facilities, local agencies specialized in
natural resource and environment and People’s Committees of all levels to
reduce expenditure on investment and operation while ensuring data stability
and security.
3. At the end of the preliminary design process,
display general positions of all national satellite navigation stations on a
1:1,000,000 nation topographic map. Specific position of each station must be
displayed on a 1:50,000 national topographic map or larger to serve as the
basis for survey and choosing station location.
1. Name of a national satellite navigation
stations must include a full name and an abbreviated name. The full name shall
be the location of the station. The abbreviated name consists of 4 letters
abbreviated from the full name satisfactory to following requirements:
a) Distinguishable from the full name; and
b) Not repeating other names in the national
satellite navigation network; and
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2. Number of a national satellite navigation
station consists of: the first 2 letters are country code, the next 4 letters
are abbreviated name of the station, the next 3 letters are order of the
station within the national satellite navigation network in which the
continuous operating reference stations shall be numbered from 001 to 039 and
continuous operating stations shall be number from 040. Number of each national
satellite navigation station must be idiosyncratic within the national
satellite navigation network.
Article 7. Survey and
selection of location of national satellite navigation station
1. On the basis of results of preliminary design
of national satellite navigation stations performed as specified in Article 5
of this Circular, conduct physical survey at estimated station location. The
survey aims to collect following information:
a) Criteria regarding basic information,
including information on natural geography, characteristics, climate, traffic,
socio-economic conditions, local security, etc.;
b) Criteria regarding environment and scenery including
information on whether surroundings of the estimation station location
influence satellite signal receipt quality;
c) Criteria regarding infrastructure including
available information on local infrastructure as well as other information
serving installation and placement of equipment;
d) Criteria regarding GNSS satellite: collect
data directly by GNSS reception apparatus in at least 24 hours at estimated
calibrating gauge with specifications established on the reception apparatus
similar to official operation to analyze and assess satellite signal receipt
quality on monitored frequency; assess interference, obstruction and reduction
of signal of each satellite in a day; assess impact of other radio signals in
the area;
dd) Criteria regarding measurement and survey of
current conditions: directly me33sure the premises of the areas, pay special
attention to objects with great height that potentially affects ability to
receive signals of the reception apparatus;
e) Criteria regarding national coordinate and
national altitude, including examining presence and usability of coordinates,
altitude and gravity in the areas to serve measurement and connection;
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h) Details for each criteria specified in Points
a, b, c, d, dd, e and g of this Clause are specified in Annex 2 of this
Circular. At the end of the survey, entities conducting the survey must produce
survey final reports with confirmation of participating parties.
2. On the basis of preliminary design combining
with survey for selecting location for nation satellite navigation stations,
produce official design. The official design must display all basic information
of the station namely: name, number, approximate coordinate, distance to
neighboring stations; symbols used in design must be clear and consistent. Official
design must be submitted in physical form and digital form.
Article 8. Construction of
base section of national satellite navigation stations
1. Base section of a national satellite
navigation station must be constructed on stable and spacious ground with 170o
view to the sky from the antenna position. Do not place metal plating,
trees with broad canopy, metal fences, etc. within 2 meters of the base section
to minimize multipath interference.
2. The base section shall be made of reinforced
concrete with grade M25 concrete (according to 39 TCVN 6025:1995) or higher.
The base section shall be in form of a cylinder, 0.3 m in radius, height from
the base to antenna placement position is 4 meters. Special cases are
prescribed as follows:
a) In case of surrounding structures affecting
signal receipt, may raise height of the base section by no more than 8 meters;
b) In case a base section is positioned on other
structures, may lower height of the base section to no lower than 2 meters
compared to roof of said structures.
3. An antenna mount shall be attached to the top
of the base section. The antenna mount must be installed fixed to base section,
processed with stainless steel and capable of performing following functions:
tightening the antenna, returning the antenna to flat surface and adjusting the
antenna orientation (consult Annex 3 of this Circular).
4. Mark 2 altitude marks at the bottom of the
base section, one of which is above the base section and the other is below
ground level. In case of base sections installed on other structures, place
only 1 altitude mark. Determine vertical distance between the altitude mark and
antenna reference point (ARP) with accuracy of less than 2mm. Display of
altitude mark shall comply with Annex 4 of this Circular.
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6. Base sections of continuous operating
reference stations shall be constructed above the ground or on ancient
architectural structures. Regulations on continuous operating stations shall
comply with Annex 6 of this Circular.
Article 9. Satellite signal
receptor of national satellite navigation stations
1. antenna receiving satellite signals shall be
installed on top of the base section via the antenna mount, returned to flat
surface; the antenna must face true north with deviation no more than ±5o,
if exceeding 5o, record the specific value in diary. antennas must meet
following basic requirements:
a) Use antennas with choke rings, capable of
receiving all signals (frequencies) available from satellite navigation systems
at the time of installation such as: GPS, GLONASS, GALILEO, BDS, QZSS;
encourage using antennas capable of receiving signals that are not transmitted
by only planed to be transmitted from aforementioned satellite navigation
systems or new satellite navigation systems such as the IRNSS;
b) Antenna’s name must be included in list of
antenna whose phase center receives absolute calibration by the IGS;
c) Antennas must endure humidity up to 100 %;
dust and water resistance standards must be at least IP67 according to stanrd3s
of the International Electrotechnichal Committee (IEC);
d) Antennas must be able to operate in
temperature ranging from -10oC +70oC;
dd) Base continuous operating reference stations
must use antennas with choke rings made from Dorne-Margolin materials which are
recommended for other stations;
e) Only use hemispherical protective covering
for antennas, do not use conical protective covering;
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2. Satellite signal receivers must be placed in
dry and spacious areas and ensured regarding continuous operation. Receivers
must meet following basic requirements:
a) Capable of receiving all available signals
from satellite navigation systems at the time of installation such as: GPS,
GLONASS, GALILEO, BDS, QZSS;
b) Have no less than 555 channels, at least 12
of which must be assigned to each frequency from ach aforementioned satellite
navigation systems;
c) Capable of searching and receiving signals
from satellites in mask angle of <10o and eliminating multipath
interference;
d) Capable of receiving signals with data
sampling of 1 second or less, extracting data via current versions of RTCM such
as 2.x/3.x, extracting data via CRM, CMR+, NMEA-0183, etc. and supporting
Ntrip, TCP/IP and FTP;
dd) Have at least 2 power supply, support
connecting directly with meteorology sensors and inclinometer;
e) Have all basic ports such as RJ-45, USB,
3G/4G/5G, RS-232;
g) Dust and water resistance standards must be
at least IP67 according to stanrd3s of the International Electrotechnichal
Committee (IEC);
h) Capable of operating in temperature ranging
from -10oC +65oC;
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k) Signal cable from receivers to antennas must
not exceed 70 meters. If necessary, measure and assess signal quality prior to
official installation. With respect to areas with high lightning density, set
the distance from the receivers to antennas as short as possible;
l) Connection between antennas and receivers
must be placed in industrial PVC or HDPE pipes and buried underground level, if
necessary, may design exposed transmission with firm shelves and do not leave
the lines too tensed. Whichever end connects to the antenn3 must be watertight,
especially when installed in coastal areas to prevent corrosion and rust;
m) Receivers are installed to receive signal 24
hours continuously from all visible satellite with data sampling of 1 second;
mask angle in receivers is 0o;
3. Receivers of satellite navigation signal and
other auxiliary equipment must be placed in equipment cabinet with ventilation
fans that are automatically turned on/off via thermo sensor relays to reduce
temperature in cabinet (design of the cabinet is illustrated under Annex 7 of
this Circular).
4. The equipment cabinet must be placed in
indoors, in special cases in which distance from rooms to base section of the
antennas is too great or no more space for placement in the rooms, the cabinet
may be placed outdoors. With respect to areas with unfavorable weather
conditions namely high temperature, high annual precipitation or poor security,
when placing equipment cabinet outdoors, construct buildings to ensure safety
of the cabinet (design of buildings is illustrated under Annex 8 of this
Circular).
Article 10. Meteorological
sensors
1. In case meteorological sensors are integrated
in national satellite navigation stations to serve scientific research, improve
calculation and research weather model, the installed sensors must be
specialized equipment; all meteorological sensors must be inspected in terms of
technical requirement satisfaction prior to installation.
2. Meteorological sensors must be installed near
antennas receiving satellite navigation signals but must not interfere signal
receipt or cause any interference; must determine vertical distance from
antenna reference point (ARP) to atmospheric pressure sensors of meteorological
sensors with less than 1 cm in accuracy.
3. Basic requirements of meteorological sensors:
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b) Accuracy when measuring relative humidity: ≤
±2%;
c) Accuracy when measuring temperature: ≤ ±0.1oC;
d) Antennas must be able to operate in
temperature ranging from -10oC +60oC;
4. During operation, regularly examine all
sensors, especially temperature sensors and take immediate measures to repair
or replace. Examination, maintenance, repair and replacement shall comply with
Article 7, Article 8 and Article 9 of Circular No. 70/2015/TT-BTNMT dated
December 23, 2015 of Ministry of Natural Resources and Environment on technical
regulations for automatic meteorology and hydrology stations.
Article 11. Power supply
1. Each satellite navigation station must have 2
power supplies: a main power supply and a backup power supply. In which, the
main power supply shall be powered by the national power grid while the backup
power supply is powered by UPS system, rechargeable battery, etc. to maintain continuous
operation of equipment of the station for at least 48 hours. In areas with high
annual daytime hours, the backup power supply can be the solar panel system.
2. Powering equipment of the national satellite
navigation station must be managed by distributor capable of automatically
switching between the main power supply and the backup power supply.
3. all electrical components must be equipped
with surge protectors to ensure safety for the whole system.
Article 12. Data
transmission solution
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2. In addition to primary internet connection
which is FTTH cable (or Leased line), each national satellite navigation
station must have a backup internet connection which is FTTH cable of an
internet service provider other than the internet service provider providing
the primary internet connection or use 3G/4G/5G connection solution in areas
with stable 3G/4G/5G signal. Each FTTH connection must be provide with a static
IP address to ensure stable data transmission.
3. Central control and processing stations must
be equipped with 2 internet connections which are FTTH cable (or Leased Line)
provided by 2 different internet service providers. Each internet connection
shall be provided with at least 1 static IP address. Both connections must have
adequate bandwidth to receive data transmitted from satellite navigation
stations and provide services for users continuous and uninterrupted.
4. In order to guarantee quality of providing
re33l-time kinematic services, average permissible latency for transmitting
data from satellite navigation stations to central control and processing
stations is <50ms for FTTH (or Leased Line) connection and <100ms for
3G/4G/5G connection.
Article 13. Lightning
protection
1. Direct lightning protection system is
designed to ensure safety for equipment in the national satellite navigation
stations. Install earth electrodes satisfactory to Circular No.
26/2016/TT-BTTTT dated December 7, 2016 of Ministry of Information and
Communications attached to National Technical Regulation on earthing of
telecommunication stations.
2. Equipment potentially struck by lightning
must be equipped with lightning dissipators and surge protection devices
consisting of: power supply, conductor connecting antennas with satellite
signal receivers, conductor connecting meteorological sensors with satellite
signal receivers (if any).
Chapter III
CALIBRATION IN NATIONAL
SATELLITE NAVIGATION NETWORK
Article 14. Calibrating and
determining VN-2000 coordinates of national satellite navigation network
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2. GNSS receivers positioned in level 0 national
coordinates must be multifrequency receivers which must be able to receive at
least L1/L2 signals from GPS and GLONASS systems; period of simultaneous and
continuous monitor must not be less than 24 hours, starting from 7 a.m (Vietnam
time); data sampling is 15 seconds; utilizing static measurement method with
mask angle of 10o. Receivers installed in national satellite
navigation stations must be configured as specified in Point m Clause 2 Article
9 of this Circular.
3. Calculation and processing shall be performed
by common GNSS processing software; during calculation and processing of
baselines, must use final orbit to calculate. Variance of point positions after
adjustment calculation must not exceed 2cm. Calculation process shall comply
with Circular No. 06/2009/TT-BTNMT dated June 18, 2009 of Ministry of Natural
Resources and Environment attaching Technical Regulations on developing
national coordinate network.
Article 15. Calibrating and
determining altitude of national satellite navigation stations
1. Establish independent altitude grids to
determine altitude of points in national navigation network. Design single
grid, each of which must utilize at least 2 points in high-level national
leveling network in the areas as starting points. Designing, calibrating and
calculating altitude shall comply with Decision No. 11/2008/QD-BTNMT dated
December 18, 2008 of Ministry of Natural Resources and Environment attached to
National Technical Regulations on development of leveling grid.
2. For points affiliated to base continuous
operating reference stations: designing, calibrating and calculating shall be
performed 999ccording to second-degree elevation measurement procedures.
National altitude points serving as starting points must be second-degree and
third-degree altitude points. Closure between 2 measurements and between 2 high
category points must not exceed ±4√L for
plains and ±5√L for
mountainous regions (L refers to length of the measured space in km).
3. For points affiliated to continuous operating
reference stations: designing, calibrating and calculating shall be performed
999ccording to third-degree elevation measurement procedures. National altitude
points serving as starting points must be first-degree, second-degree and
third-degree altitude points. Closure between 2 measurements and between 2 high
category points must not exceed ±10√L for plains and ±12√L for mountainous
regions (L refers to length of the measured space in km).
4. Calibrating and determining altitude of
national navigation stations must be performed for all points as specified in
Clause 4 Article 8 of this Circular. Vertical difference in the middle of
altitude mark and ARP is determined by specialized steel rule or measuring
instruments with equivalent accuracy and separately recorded from orthometric
readings.
Article 16. Calibrating and
determining gravitational value of national satellite navigation stations
1. On the basis of base gravitational points and
first-degree gravitational points in measured areas, design measuring grids
connected to national satellite navigation network with accuracy of
second-degree gravity according to relative gravity measurement method. Each
grid must utilize at least 2 points in high-level national gravity network in
the areas as starting points.
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3. Use gravity measuring devices with accuracy
of at least 0.03 mGal to determine gravitational value for national satellite
navigation network.
Article 17. Connecting
national satellite navigation network with the ITRF
1. The national satellite navigation network
shall be connected with the ITRF via stations affiliated to network of
international GNSS service providers, IGS in the area. All points in the
national navigation network shall be processed and calculated on a regular and
daily basis in ITRF with accuracy of ≤ 2mm.
2. Use GNSS data from at least 5 stations within
the IGS network, prioritize stations with stable data and stations that have
been constructed not recently and other figures relating to stations according
to recommendation of the IGS.
3. Use software with high accuracy namely
Bernese, GAMIT/GLOBK, etc. to do the calculation. During the calculation
process, in addition to GNSS value, use other related data to increase accuracy
such as: figures regarding post-inspected antennas of IGS, accurate satellite
schedules, rotation of the Earth’s poles, updated models of tidal impact, model
of troposphere, model of ionosphere, etc.
4. Calculation shall be performed on a daily
basis, starting from 12 a.m (UTC time); use GNSS data with data sampling of 30
seconds for calculation. The generated results shall serve as the basis for
determining platform displacement, vertical displacement, developing frame of
reference and national dynamic coordinate systems and determining
transformation parameter for transforming between VN-2000 national coordinate
system and ITRF.
Chapter IV
CENTRAL CONTROL AND
PROCESSING STATION
Article 18. Central control
and processing station
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2. Central control and processing station must
be capable of receiving data continuously from national satellit3 navigation
stations; calculate, process and provide services for users promptly 24 hours/7
days.
3. Central control and processing station must
be capable of processing and calculating coordinates of points of national
satellite navigation network within the ITRF with accuracy in mm.
4. Central control and processing station must
be capable of providing real-time kinematic services with high accuracy for
users rapidly, precisely and promptly via the internet.
5. Central control and processing station must
b3 capable of conducting post-processing with respect to GNSS values offline.
6. Central control and processing station must
be capable of controlling, establishing configuration and monitoring oper33tion
of national satellite navigation stations regularly, continuously and remotely
via the internet.
7. Central control and processing station must
be capable of monitoring operation of GNSS measuring instruments utilizing
real-time kinematic service.
8. Central control and processing station must
be capable of managing accounts that have and are using services provided by
the national satellite navigation network.
9. Central control and processing station must
assist calculating figures related to atmospheric layers based on GNSS data
combining with data from meteorological sensors at national satellite
navigation stations.
10. Central control and processing station must
b3 capable of storing GNSS data collected from national satellite navigation
stations in RINEX V2.x,V3.x format. Storage period is prescribed as follows:
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b) At least 20 years for data with data sampling
of 15 seconds (except for special request);
c) At least 10 years for data with data sampling
of 1 seconds;
d) Permanent for calculation results related to
developing national frame of reference and coordinate system.
11. Central control and processing station must
have multi-layer security to ensure safety and assurance for data of national
satellite navigation network and users.
12. Central control and processing station must
be capable of backing up data automatically on a periodic basis to ensure data
safety.
Article 19. Data center
1. Data centers must be powered by stable and
quality national electrical grid with 3 phases and backup power generator to
provide adequate power in case of power shortage.
2. High capacity uninterruptible power supply
(UPS) to sustain the entire equipment system of the center including servers,
air conditioners, auxiliary devices, etc. in at least 30 minutes, backup power
generators and UPS are recommended to be set 1+1.
3. Data centers must be cooled by air
conditioning systems which operate in turns, continuously and are capable of
controlling temperature with accuracy of ±1oC and humidity with
accuracy of ±5%.
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5. Data centers must be installed with fire
alarm systems capable of detecting smoke early, warning automatically and
suppressing fire automatically.
6. Data centers must have surveillance camera
system connected with the DVR to monitor situations inside and outside of the
data centers regularly and continuously.
7. Data centers must have server systems
powerful enough taking into account backup element, switching system operating
parallel with optimal backup mechanism. Cable systems must be organized,
flexible and reusable. All cabins, racks, panels and cables must be labeled in
a memorable and expandable fashion.
Chapter V
PROVISION AND USE OF
SERVICES OF NATIONAL SATELLITE NAVIGATION NETWORK
Article 20. Services
provided by national satellite navigation network
1. Providing GNSS data with respect to data type
with data sampling of 30 seconds, 15 seconds and 1 second in RINEX format
serving post-processing in period specified in Clause 10 Article 18 of this
Circular.
2. Providing GNSS network calculation and
processing services with accuracy of mm in the ITRF.
3. Providing GNSS value processing and
calculation services for users online on personal request.
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5. Services provided by the national satellite
navigation network used in survey and creation of topographic maps; development
and update of national geological database; survey and creation of cadastral
maps; scientific research and other survey, mapping activities.
Article 21. Using real-time
kinematic services
1. Mobile GNSS measuring instruments utilizing
real-time kinematic services must satisfy following basic requirements:
a) Mobile multiband GNSS measuring instruments,
capable of receiving all signals from popular satellite navigation systems such
as: GPS, GLONASS, GALILEO, BDS;
b) Capable3 of establishing connection via Ntrip
protocol and receiving RTCM v3.x data corrections with message packets from
1021 – 1027;
c) Receiving signals from satellite navigation
systems in clear weather condition.
3. Accuracy of real-time kinematic services
provided by the national satellite navigation network is specified in schedule
below:
Correction
method
Absolute
horizontal accuracy
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Area with
k≤80km
Area with
k>80km
Plain regions
Mountainous
region
VRS, MAX, iMAX
3cm
÷ 5cm
4cm
÷ 7cm
<10cm
<
17cm
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(apply if S ≤
25 km)
<
5 cm
In which:
- “k” refers to distance between processing
satellite navigation stations within the network to provide real-time kinematic
services. Specific ra3nge of areas until December 31, 2019 is specified
under Annex 09 attached hereto.
- “S” refers to distance from mobile satellite
signal receivers to fixed satellite navigation stations used for corrections.
- Area covering Geoid model of Ministry of
Natural Resources and Environment is specified under Annex 10 attached hereto.
Chapter VI
IMPLEMENTATION
Article 22. Entry into
force
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Article 23. Implementation
1. Ministries, ministerial agencies, Governmental
agencies, People’s Committees of provinces and central-affiliated cities and
relevant organizations, individuals are responsible for the implementation of
this Circular./.
2. Difficulties that arise during implementation
should be reported promptly to Ministry of Natural Resources and Environment./.
PP. MINISTER
DEPUTY MINISTER
Nguyen Thi Phuong Hoa