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Site Information for Singapore



Nanyang Technological University (NTUS), Singapore

GNSS contact: Hans van der Marel, TUD/LR/DEOS

GNSS Instrument(s)

NameMarkerReceiverAntennaOperatorNetworkStart dateEnd date





NTUS (Nanyang Technological University)

Marker ID: 22601M001
Log file: ntus_20170424.log


Installedweek/d doyRemovedweek/d doyReceiver typeS/NFirmware
1997-06-26T03:00Z0911/4 1771999-09-02T00:00Z1025/4 245ROGUE SNR-80001753.2.32.1
1999-10-28T06:00Z1033/4 3012000-10-20T00:00Z1084/5 294AOA SNR-12 ACT2293.3.32.3
2001-02-22T05:20Z1102/4 0532001-03-11T00:00Z1105/0 070AOA SNR-12 ACT2243.3.32.3
2001-06-18T03:40Z1119/1 1692006-11-03T00:00Z1399/5 307AOA SNR-12 ACT2253.3.32.4
2007-06-01T00:00Z1429/5 1522007-09-20T10:40Z1445/4 263LEICA GRX1200GGPRO3527295.10/3.013
2007-09-20T10:58Z1445/4 2632007-11-21T02:50Z1454/3 325LEICA GRX1200GGPRO3527295.50/
2007-11-21T02:50Z1454/3 3252008-03-07T07:00Z1469/5 067LEICA GRX1200GGPRO3527295.60/3.014
2008-03-07T07:00Z1469/5 0672009-09-03T07:24Z1547/4 246LEICA GRX1200GGPRO3527295.62/3.014
2009-09-03T07:45Z1547/4 2462010-04-05T08:30Z1578/1 095LEICA GRX1200GGPRO3527297.53/3.015
2010-04-05T08:30Z1578/1 0952010-05-10T06:53Z1583/1 130LEICA GRX1200GGPRO3527297.80/3.018
2010-05-10T07:04Z1583/1 1302011-01-25T03:14Z1620/2 025LEICA GRX1200GGPRO3527297.80/3.019
2011-01-25T06:28Z1620/2 0252014-07-27T03:00Z1803/0 208LEICA GRX1200GGPRO3527298.10/3.019
2014-12-20T09:06Z1823/6 3542017-04-24T07:50Z1946/1 114LEICA GRX1200GGPRO3527298.10/3.055
2017-04-24T08:00Z1946/1 114 LEICA GRX1200GGPRO3527299.20/3.823


Installedweek/d doyRemovedweek/d doyAntenna typeDomeS/NHeightAntenna calibration
1997-06-26T03:00Z0911/4 1771998-05-07T08:00Z0956/4 127AOAD/M_TNONE1770.0776AOAD-M_T_RFI____NONE_177.atx
1998-06-08T00:00Z0961/1 1592007-05-16T00:00Z1427/3 136AOAD/M_TNONE2220.0776AOAD-M_T_RFI____NONE_222.atx
2007-05-16T00:00Z1427/3 136 LEIAT504GGNONE2002400.0776

External Frequency

Installedweek/d doyRemovedweek/d doyExt. Frequency type
1997-06-26T03:00Z0911/4 177 INTERNAL


1997-06-26T03:00Z 0911/4 177 - 2010-10-05T00:00Z 1604/2 278
NTUS is operated jointly for IGS by Singapore Land Authority (SLA) and the Delft University of Technology (DUT/DEOS).
1997-06-26T03:00Z 0911/4 177 - 2006-11-03T00:00Z 1399/5 307
No rawdata files are available for the following periods (week/dow): until 999/6; 1011/2-1068/5; 1083/2; 1226/2-1232/3; 1310/4-1318/1; 1320/0-1321/1;1322/1-1323/0;1327/6-1329/2;1371/4; 1372/2 and 1372/3. Also, there are gaps in the rinex data for this period.
1997-06-26T03:00Z 0911/4 177 - 2007-05-16T00:00Z 1427/3 136
The antenna is mounted on a pillar with a SOKIA Tribrach. The pillar (approx. 1.50m high) is located on the building of the Survey Laboratory of the School of Civil and Structural Engineering of the Nanyang Technological University at Singapore
2006-11-03T00:00Z 1399/5 307 - 2007-05-16T00:00Z 1427/3 136
At the time the AOA_DM/T antenna was dismantled, the antenna was warbling as the tribrach and adaptor was not secure due to wear and tear. The antenna was also orientated to the East instead of North based on the position of the cable connector. It is not known since when this condition existed, but we suspect it happened at the end of life of the AOA Turbo Rogue receiver (after this receiver stopped functioning). However, it may have affected the time series at the end of 2006.
2007-05-16T00:00Z 1427/3 136 -
The antenna is mounted on a pillar with a LEICA GDF 111-1 Tribrach and rotatable Tribrach adapter (replacing the damaged SOKIA Tribrach and adapter). The new antenna was installed at a height within a accuracy of 0.5mm compared to the previously installed antenna. It was also orientated to the North within +/-2deg. The pillar (approx. 1.50m high) is located on the building of the Survey Laboratory of the School of Civil and Structural Engineering of the Nanyang Technological University at Singapore. There is another choke ring antenna with radome, one of the 5 national permanent reference stations, about 2m away. There is a lightning arrestor on the same roof about 4m away. Before the installation of the LEICA antenna, the pillar, received some minor rust-proofing cum painting work and heat shielding (with a pvc pipe with holes).
2010-10-05T00:00Z 1604/2 278 -
Singapore Land Authority (SLA) has taken over the operation of the station from Nanyang Technological University (NTU)
2014-07-27T03:00Z 1803/0 208 - 2014-12-20T09:06Z 1823/6 354
Receiver did not track satellites during this period due to firmware problem. Firmware was upgraded on 20 Dec 2014 and receiver started tracking again.
2015-04-05T04:00Z 1839/0 095 - 2016-04-04T13:33Z 1891/1 095
The LDC is not receiving any data due to unresolved and unknown issues.
2016-04-04T13:33Z 1891/1 095 - 2016-05-17T08:00Z 1897/2 138
The receiver is on-line again after installing a cellular modem and internet configuration. There is however an issue with the data, at regular intervals the receiver is not tracking any satellites.
2016-05-17T08:00Z 1897/2 138 - 2017-03-08T09:00Z 1939/3 067
The LDC is not receiving any data due to unresolved and unknown issues.
2017-03-08T09:00Z 1939/3 067 - 2017-04-19T19:00Z 1945/3 109
Connection to receiver has been restored and receiver is sending data again after a new antenna cable was installed. However, there during periods of the day the receiver is not tracking any data. After some time GLONASS was disabled to due some further checking, but this did not resolve the problem. On 19 April 2017 an attempt was made to upgrade the f/w to version 9.20/3.823, but failed, leaving the receiver in an inoperative state. On April 24 2017 the receiver was physically reset and f/w upgrade to version 9.20/3.823 was made. The data that was received during this period is available at the LDC, but has not been uploaded to IGS.
2017-03-08T09:00Z 1939/3 067 -
Uploads to IGS have been restarted after the upgrade to f/w version 9.20/3.823.
For more information contact Hans van der Marel.