Abstract Over the past years, International GNSS Service (IGS) has been putting efforts into extending its service by setting up and running Multi-GNSS experiment pilot project (MGEX). Several MGEX analysis centers (ACs) contribute providing solutions containing not only GPS GLONASS but also Galileo, BeiDou, QZSS. As current IGS combination software can handle orbits of one constellation at a t...

We consider a construction of approximate confidence intervals on the variance component σ 1 in mixed linear models with two variance components with non-zero degrees of freedom for error. An approximate interval that seems to perform well in such a case, except that it is rather conservative for large σ 1/σ , was considered by Hartung and Knapp in [6]. The expression for its asymptotic coverag...