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♣ Real-Time PPP Service
JAXA conducts real-time precise point positioning (PPP) experiments using the L-band experimental(LEX) signal from "Michibiki(QZS-1)". PPP is a technique to calculate accurate user positions using precise orbit and clock of GNSS without any reference stations.

Our Real-Time PPP Service allows to obtain a centimeter accuracy positioning.

♣ What's MADOCA?
For this service, JAXA has developed Multi-GNSS orbit and clock estimator called "MADOCA (Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis)". This basic requirements are as follows;

 (1) Multi-GNSS Support (GPS,GLONASS,Galileo and QZSS)
 (2) Both of Offline and Real-Time Estimator
 (3) Precise Estimation using latest models
 (4) Reduction of Processing Time by Multi-threading
 (5) Maintainability and Portability which can run on note PC


System: GPS, GLNASS and QZS (Gallileo and BeiDou are under construction..)
Goal: Real-Time positioning with less than 10cm accuracy
Goal of orbit/clock accuracy:
ProductOfflineReal-Time
GPSGLOQZSGPSGLOQZS
OBT3cm7cm6cm9cm
CLK0.1ns0.25ns0.1ns0.25ns

Edit Date:2015/11/26