Network Real Time Kinematic (RTK) Service

The SatRef system produces the Network RTK correctional data stream to users by means of the SatRef NTRIP server. Users can obtain the correctional data stream via the internet. The real-time positional accuracy of Network RTK is about 3-5cm. It can be applied in topographic mapping, monitoring of structural movement (e.g. building, bridge), machine guidance, etc.

Differential GNSS (DGNSS) Positioning Service

The SatRef system produces the DGNSS correctional data stream to users by means of the SatRef NTRIP server. Users can obtain the DGNSS correctional data stream via the internet. The real-time positional accuracy of DGNSS is about 1-2m. It can be applied in navigation (land and sea), fleet management, location based services, mobile GIS systems, etc.

Application

If you want to apply this service (Free of charge), please fill in the application form and return it by fax or email to geodetic@landsd.gov.hk.

Connection Settings

Hostname:	www.geodetic.gov.hk
Port:	2101
Login:	Your Username and Password
Access Point Name (APN):	If you connect to our NTRIP server through Mobile Telecommunications Services, please check the APN setting with service provider.

Mountpoint Information

Radio Technical Commission for Maritime Services (RTCM) Standard is used in this service.




Mountpoint		VRS_1023*	VRS_1024*	VRS	FKP31	FKP	FKP23	DGPS
Type		Network RTK						DGNSS
RTCM format		v3.1	v3.1	v3.1	v3.1	v3.0	v2.3	v2.2
Network Type		VRS	VRS	VRS	FKP	FKP	FKP	N/A
Satellite System		GPS GLO	GPS GLO	GPS GLO	GPS GLO	GPS GLO	GPS	GPS GLO
Remarks		with Geoid Correction		-	-	-	-	Use HKSC or HKPC as reference
Message Type	Message Name	RTCM 3 Message Type Included
1004	Extended L1&L2 GPS RTK Observables	√	√	√	√	√
1006	Stationary RTK Reference Station ARP with Antenna Height	√	√	√	√	√
1008	Antenna Descriptor & Serial Number	√	√	√	√	√
1012	Extended L1&L2 GLONASS RTK Observables	√	√	√	√	√
1019	GPS Ephemerides			√		√
1020	GLONASS Ephemerides			√		√
1021*1	Helmert Transformation Parameters	√ *2	√ *3
1023	Residuals, Ellipsoidal Grid Representation	√
1024	Residuals, Plane Grid Representation		√
1025	Projection Parameters	√	√
1029	Unicode Text String				√
1030	GPS Network RTK Residual Message	√	√	√	√
1031	GLONASS Network RTK Residual Message	√	√	√	√
1032	Physical Reference Station Position Message	√	√	√		√
1033	Receiver and Antenna Descriptors	√	√	√	√	√
1034	GPS Network FKP Gradient				√
1035	GLONASS Network FKP Gradient				√
Message Type	Message Name	RTCM 2 Message Type Included
1	Differential GPS Corrections						√	√
3	Reference Station Coordinates						√	√
14	GPS Time						√	√
16	Special Message (ASCII text)						√	√
20	RTK Carrier Phase Corrections						√
21	RTK Pseudorange Corrections						√
22	Extended Reference Station Parameters						√
23	Antenna Description						√
24	Coordinates of Antenna Reference Point (ARP)						√
31	Differential GLONASS Corrections							√

*1 In order to fulfill the requirement of RTCM Standard, the 7-P datum transformation parameters transmitted in Message Type 1021 are slightly different from the published 7P_ITRF96_HK80_V1.0 data sheet.
(Rotation parameters: round to the nearest 0.00002"; Scale: round to the nearest 0.00001ppm)

*2 The Height Indicator of Message Type 1021 of Mountpoint VRS_1023 was set to 2 (i.e. value between [Height above HKPD] and [WGS84 Ellipsoidal Height] would be transmitted) on 11 July, 2018.

*3 The Height Indicator of Message Type 1021 of Mountpoint VRS_1024 was set to 1 (i.e. value between [Height above HKPD] and [HK80 Ellipsoidal Height] would be transmitted) on 11 July, 2018.

Remark:

1. For more details, please refer to NTRIP source table.

2. Please check the technical specifications of your receivers for selection of the most appropriate type of service and compatible RTCM format. For GNSS receiver settings, please refer to this link or contact with vendor.

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