MADOCA-LEX

Nistorescu Sorin

Active Member
There are things that deserve to be shown about Javad receivers.

Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis (MADOCA) is the software developed
by Japan Aerospace Exploration Agency (JAXA) for high precision estimating for the orbits and clocks
of currently available GNSS satellites using a multi-GNSS monitoring network stations located around
the world. MADOCA-LEX provides the satellite orbit and clock correction data of multi-GNSS using a
state-space representation (SSR) format for real-time PPP.
(https://ssl.tksc.jaxa.jp/madoca/public/public_index_en.html)

Being the only one on the market that can track and decode the L-band Experiment (LEX) signal
messages, Javad DETA-3 receiver, underlies in many configurations using this augmentation signal at
the 1278.75-MHz band (same frequency as that of Galileo E6) broadcasted from QZSS:

- techniques developed to decode the LEX messages without the use of an LEX signal tracking loop for
estimating the code phase and the Doppler frequency of the LEX signal, but with the aid of the
conventional L1CA signal, broadcasted simultaneously from the QZSS (picture 1);

- outdoor localization for a mobile robot using precise point positioning (PPP) based on the
Quasi-Zenith Satellite System (QZSS) L-band Experiment (LEX) signal (picture 2);

- buoy observation systems to provide accurate and necessary information for tsunami evacuation more
quickly and also crustal deformation under strong sea current (picture 3);

Don't know why, but somehow I feel a sense of pride..
 

Attachments

  • picture 1.png
    picture 1.png
    2 MB · Views: 351
  • picture 2.png
    picture 2.png
    568.7 KB · Views: 381
  • picture 3.png
    picture 3.png
    207.6 KB · Views: 391

Nistorescu Sorin

Active Member
Recently, the Global Positioning Augmentation Service (GPAS) which provides RTCM SSR corrections using MADOCA (orbit & clock estimator) technology from the L6E signal of QZSS satellites, just started.
https://en.gpas.co.jp/

For the moment I do not know if J-Field supports RTCM SSR formats, but combining the Centimeter Level Augmentation Service (CLAS) everywhere in the world from MADOCA, with a broadband internet satellite solution (Thuraya IP+) that becomes more and more accessible in areas inadequately served by terrestrial networks, could be an advantage in many "remote" situations:


Japan’s Quasi-Zenith Satellite System (QZSS) and the EU’s Galileo constellation could be linked in near future, but for now I will like to see a Real-Time PPP demonstration for the LS (or maybe T2 with JMT) and even with the "Test drive Triumph-LS" service, based on RTCM SSR corrections using MADOCA technology (accuracy, time to converge, etc.), if possible.

- Internet Address : madoca.ntrip-mgm.net
- Port : 2101
- Format : RTCM-SSR
- Mount Point : MDC1, MDC2
- User Account : ( https://ssl.tksc.jaxa.jp/madoca/public/public_application_en.html );
 
Top