Superseding
Chinese Name	ȫ��λϵͳ��GPS�������淶
English Name
Chinese Standard Classification
Professional Classification
ICS Classification
Issued on	2009-02-06
Implemented on	2009-06-01
Abolished on
Issued by	AQSIQ��SAC
Chinese Pages
Word Count	13000 words

1  Scope
 This standard specifies the establishment of the arrangement principle, measurement method, precision index and technical requirements of GPS control network by virtue of the static global positioning system (GPS) survey technology.
 This standard is applicable to the design, layout survey and data processing for the national and local GPS control network.
2  Normative References
 The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
 GB/T 12897 Specifications for the first and second order leveling
 GB/T 12898 Specifications for the third and fourth order leveling
 GB/T 17942 Specifications for national triangulation
 CH 1002 Specifications for inspection and acceptance of surveying and mapping products
 CH 1003 Standard for quality assessment of surveying and mapping products
 CH/T 1004 General rules for technical design of surveying and mapping
 CH/T 2008 Specifications for construction of the continuously operating reference stations using global navigation satellite system
 CH/T 8016 Specification for check off and test of GPS receiver of surveying model
3  Terms and Definitions
 For the purposes of this standard, the following terms and definitions apply.
3.1
 Observation session
 The continuous observation time interval from the beginning to the end of receiving satellite signals on the survey station, hereinafter referred to as the session.
3.2
 Simultaneous observation
 Two or more receivers simultaneously observing the same group of satellites
3.3
 Simultaneous observation loop
 The closed loop constituted by the baseline vector obtained through the simultaneous observation by three or more receivers.
3.4
 Independent observation loop
 The closed loop constituted by the baseline vector obtained through the non-simultaneous observation.
3.5
 Percentage of data rejection
 In the same observation session, the ratio of the number of rejected observation values to the total number of obtained observation values.
3.6
 Static GPS positioning
GPS positioning survey for determining the relative position between survey stations through the simultaneous observation on several survey stations.
3.7
 Continuously operating reference station; CORS
 The observation system composed of the receiver (including antenna) of satellite positioning system, computer, meteorological equipment, communication equipment and power supply equipment, and observation pier, etc. It continuously track the observation satellite signals for a long term and transmit the observation data to the data center through the data communication network by the timing mode, real-time mode or as required by the data center. It may provide the real-time, rapid or subsequent data service by the independent or networking mode.
3.8
 Single baseline solution
 During the simultaneous observation of several GPS receivers, the GPS observation data is selected from two receivers each time for the solution of corresponding baseline vectors.
3.9
 Multi-baseline solution
 From the simultaneous observation values of m (m≥3) sets of GPS receivers, m-1 individual baselines constitute the observation equation for the unified solution of m-1 baseline vector.
3.10
 International GNSS service; IGS
 The international organization providing the Global Navigation Satellite System (GNSS), including the information on the aspects of satellite (including GPS, GLONASS and GALILEO) ephemeris, satellite clock correction and ground-reference station coordinate of corresponding satellite system.