China's RBN-DGPS System to Begin Operation

Coverage area: 300 km
The China Maritime Safety Administration (CMSA) released in Beijing on December 28 that RBN-DGPS system will be formally put into full operation for public navigation service on January 1, 2002. Within the 300-km signal coverage area of single RBN-DGPS station at sea, the position accuracy is better than 5 m for sub-meter navigation receiver.

20 RBN-DGPS stations
According to "CHINESE MARINE RBN-DGPS SYSTEM PLAN", 20 RBN-DGPS stations have been set up by CMSA through 1996-2000 in three phases. The signal coverage (or multiple) can fully cover the critical China coastal harbor, harbor approach and waterways.

Position accuracy: 5 meter
The position accuracy depends directly on the performance of the user's DGPS receiver and the distance of the user from the receiver reference station. In normal conditions, in the coverage area of 300 km radius, the meter accuracy DGPS receiver can obtain position accuracy better than 10m(2drms), while the sub-meter accuracy receiver better than 5m(2drms).

As from January 1 next year ships along the coastal areas of China will be able to receive the signal for navigation so long as they are installed with satellite signal receiver for professional use, thus being able to get high-precision positioning signal.

Marine RBN-DGPS in China

To meet the operational requirement of marine public navigators, marine surveying, marine petroleum exploitation, dredging and pilotage in China critical harbors, waterways and coastland, in 1996, taking full advantage of the equipment of existing radiobeacon and Loran-A station, China Maritime Safety Administration(MSA) started the construction of RBN-DGPS station system that was already completed before the year of 2000. The RBN-DGPS navigation service is designed to provide coverage with the specified signal strength for all harbor and harbor approach areas and other critical waterways wherein the MSA provide aids to navigation. For some critical harbor and harbor approach areas, coverage of which is provide by more than one broadcast site.
The 20 RBN-DGPS Stations:
1 Dasanshan ; 2 Laotieshan ; 3 Qinhuangdao ; 4 Beitang ; 5 Chengshanjiao ; 6 Wangjiamai ; 7 Yanweigang ; 8 Haozhigang ; 9 Dajishan ; 10 Dinghai ; 11 Shitang ; 12 Tiandashan ; 13 Zhenhaijiao ; 14 Luyu ; 15 Sanzao ; 16 Naozhoudao ; 17 Fangcheng ; 18 Baohujiao ; 19 Sanya ; 20 Yangpu
RBN-DGPS Technical Specifications
  • Transmission Frequency: By assigned ITU for marine radio beacon, China MSA RBN-DGPS stations transmit correction information in the frequency band 283.5-325.0 kHz.

  • Identification Number: Following the recommendation on the allocation and assignment of reference and broadcast station identification number by IALA, the ID number are assigned from north to south, 601-609 for reference station and 601-629 for broadcast site.

  • Signal Coverage: 300 km at sea for single station.

  • Signal Format and Type: Message type is in the format RTCM SC104 Recommended Standards for differential navstar GPS Service. Type Message 9-3, 16 are applied. However, the message type may be changed if appropriated.

  • Transmission Rate:200 BPS.

  • Datum: Reference station utilizes WGS-84 Coordinate System , in which its antenna position accuracy would be better than 0.5 m .

  • Position Accuracy:The meter accuracy DGPS receiver can obtain position accuracy better than 10m(2drms), while the sub-meter accuracy receiver better than 5m(2drms).

    By PD Online staff member Huang Ying

    People's Daily Online ---