湖区地形测量的网络RTK数据通信研究

Research of Data Communication in the Topography of the Lake Region in GPS Network RTK

利用网络RTK和测深仪组合测量的方式获取瞬时水底高程可以有效消除水面涌动、潮汐、水面倾斜、测深动态吃水等因素产生的测量误差。不同于传统RTK模式,网络RTK无需架设基站,布设控制点,且不受与基站距离限制。但网络RTK的使用与网络通信信号息息相关,在大型湖泊往往存在通信盲区。以江苏省"十二五"省级基础测绘五大湖泊1∶10000水下地形测量项目为例,针对网络RTK特点,提出使用数据转发手簿与数据播发电台进行数据通信的方法。该方法不仅达到了增强网络RTK传输信号的目的,同时扩大了网络RTK的使用范围。

Using the way of network RTK and echo-sounding apparatus to obtain the instantaneous bottom elevation measurement,the water surging tides,water tilt,sounding dynamic factors produced draft measurement error can be effectively eliminated.Also with the difference of traditional mode of RTK,we need not set up base stations or control points.At the same time it is not restricted by distance from the base station.But the use of the network RTK is closely related to network communication signals.Usually,there are communication blind zone in the large lakes.For Jiangsu province 12 th fiveyear 1∶10 000 underwater topographic survey project as an example,the method of using Date Forwarding Hand and Data Radio is put forward according to the characteristics of the network RTK.This method not only achieves the enhancement purpose to the network RTK transmission signal,but also increases the range of GPS network RTK.