MADOCA Products

Information (June 12, 2026)

Release of OSB products and Discontinuation of FCB products
Starting with GPS Week 2430 products (i.e., products for 2 August 2026), JAXA will begin providing Observable-specific Signal Bias (OSB) products in Bias-SINEX format. Accordingly, the publication of the current Fractional Cycle Bias (FCB) products, which are presently distributed as part of the JAXA Final products, will be discontinued.
Users performing PPP-AR positioning with JAXA products are encouraged to use the OSB products provided in Bias-SINEX format.

♣ About MADOCA
(Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis )

MADOCA[1] is the precise orbit determination (POD) tool supported Multi-GNSS (GPS, GLONASS, Galileo, BDS, and QZSS) developed by JAXA. The orbit and clock offsets are estimated in both post-processing with iterative weighted least squares (LSQ) and real-time processing with extended Kalman filter (EKF).

MADOCA product generation (Reprinted from [1])

♣ MADOCA products
MADOCA products are published on MADOCA & RINEX archive.

Post processing product

JXF : Final products same as MGEX product, named JAX0MGXFIN
TSF : Final products with the enhanced SRP model for QZSS satellites developed by the University of Tokyo [2]
JXR : Rapid products (until March, 2026)
JXU : Ultra-Rapid products (until March, 2026)

Realtime product (until March, 2026)

In addition, JGX products(*), which are generated by The Geospatial Information Authority of Japan (GSI) using MADOCA, can be accessed from CDDIS and JGX products providing service.

◊ JGX products providing service [External link]
◊ International GNSS Service (IGS) [External link]

(*) JGX is one of the International GNSS Service (IGS) analysis centers operated by GSI and JAXA. JAXA improves MADOCA, and GSI generates the products calculated using MADOCA.

♣ Documents
Related documents are as follows:

MADOCA-SEAD Interface Specification (Japanese , English)

This document defines the data interface specification required by MADOCA product users and has no technical changes from IS-QZSS(ver1.7).

Reference:
[1]MADOCA: https://doi.org/10.1016/j.asr.2023.01.060
[2]TSF : https://link.springer.com/article/10.1007/s10291-023-01527-0

Edit Date:June 12, 2026