Base Station

This page mainly puts the progress report for the Asian base station network project.

This is one of the GESTISS projects.

Guide to GNSS Base stations

This is the guide for installing base station.

DATE TITLE PDF
10/8/2016 Draft Ver.1.00 download
08/12/2017 Draft Ver.1.01 download

Guide to RTK-GNSS Logger

This is the guide for GNSS loger unit with RTKLIB.

DATE TITLE PDF
16/10/2016 GNSS Logger Unit with RKTLIB download

Introduction 1: Why do we need the base station for DGNSS or RTK ?

RTK (Real Time Kinematic) is a differential GNSS technique which provides high positioning performance in the vicinity of a base station. The technique is based on the use of carrier measurements and the transmission
of corrections from the base station, whose location is well known, to the rover, so that the main errors that drive the stand-alone positioning cancel out. A RTK base station covers a service area spreading about 10 or 20 kilometres, and a real time communication channel is needed connecting base and rover. RTK, which achieves performances in the range of a few centimetres, is a technique commonly used in surveying applications. For the detail of RTK, please check the Basic of GNSS and Precise Positioning.

Introduction 2: Continuously Operating Reference Stations (CORS) project on GESTISS

To save time of setting up the base stations, we can use CORS instead of own base stations. CORS provides the observation data for RTK positioning via mainly the Internet. In Japan, GNSS Earth Observation Network (GEONET) is a CORS network established by Geographical Survey Institute. However, GEONET provides only 30-second interval observation data for public with a few days of delay. To do the RTK positioning in "real-time" in Japan, we should subscribe the data distribution service or Virtual Reference Station (VRS) service that takes many costs. However, there is a high demand for "real-time" precise positioning. For the above reason, we will provide local-area CORS network in public to stimulate new location-based services on the part of G-SPASE projects.We set up severl reference stations in Tokyo and multiple Universities in Asia. The reference stations send the correction data via Ntrip Network transport of RTCM* via internet protocol (Ntrip) in public.

* RTCM...Radio Technical Commission for Maritime Services

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