StarFire星站差分定位系统在井位测量中的应用

The application of differential positioning system of StarFire Satellite Station in the well location survey

电台模式的常规RTK(实时动态差分系统)测量范围小(15km以内),单基站CORS系统下的网络RTK测量覆盖范围较大(70km以内),单基站CORS系统主要应用于胜利油田的井位测量,在西部偏远地区由于架设基站不便,且测量覆盖范围不够大,两种RTK均不便于采用。StarFire星站差分定位系统则不需要架设基准站,且测量覆盖范围广,单台GPS接收机就能够在全球范围内得到较高的定位精度。为了提供满足规范要求的井位测量结果,阐述了StarFire星站差分定位系统的组成、工作原理和技术指标,介绍了测区坐标系统转换参数的求取和对转换参数在控制点进行检核的方法,同时提出了该定位测量系统实测中应注意的问题及对策。通过4口井采用星站差分与RTK测量的比较,证明星站差分GPS井位测量结果可满足测量指标要求;100多口井的测量应用表明,该系统在井位测量中与常规RTK工作模式相比,可节约30%～50%的人力物力,特别适用于不适合建立CORS系统的地区。

Conventional RTK (real-time dynamic differential system) radio mode has a smaller measuring range (within 15 km),while the network RTK under a single base station of CORS system has a wider range of measurement coverage (within 70 km).The single base station CORS system is mainly used in well location survey in Shengli oil region,which is not adopted as it is inconvenience to set up base stations in the remote western region and the measurement coverage is not wide enough.However,the application of the StarFire Satellite Station differential positioning system does not require to erect the base station and the measurement coverage has a wider range,a single GPS receiver can get a higher positioning accuracy on a global scale.In order to provide the well location survey results to meet the regulatory requirements,the authors described the composition,the working principle and technical specifications of the StarFire Satellite Station differential positioning system,introduced the extracting of the coordinate system transformation parameters in the survey area and the checking method for the transformation parameters on the control points.Through the comparison for 4 wells measured by satellite station differential and RTK measurement,GPS well location survey results from the satellite station differential can meet the requirements of measurement index,at the same time,the problems and countermeasures should be noted with the positioning measurement system during the practical measurement.Measurement applications of more than 100 wells showed that 30%-50% of the human and material resources can be saved by the system during well location survey compared with that of the conventional RTK working mode,especially in areas that is not suitable for setting up a CORS system,the work efficiency can be greatly enhanced.