Abstract: Aiming at the problems of wide subsidence range and large deformation gradient in mining area,and the traditional
InSAR technology fails to extract the land surface settlement information in large deformation gradient area completely
and accurately due to the incoherence of image. This paper took the 8303 mining face of a mine in Jining City,Shandong Province
as an example,and proposed the integrating application of SBAS-InSAR and PO-SBAS techniques for subsidence monitoring,
on the basis of GACOS data assisted InSAR solution. Using the method of deformation information fusion,the paper determined
the reliable boundaries of SBAS-InSAR and PO-SBAS monitoring results through measured data and achieved the fusion
of SBAS-InSAR and PO-SBAS monitoring results through the principle of prior error weighting and the probability integral forecast
model,and analyzed the precision of the subsidence monitoring. The results show that GACOS atmospheric correction can
effectively reduce the impact of atmospheric delay,and in the case of small deformation gradient,the SBAS-InSAR monitoring
results after atmospheric correction are more reliable than conventional SBAS-InSAR. Compared with the level observation data,
the monitoring results obtained by integrating SBAS-InSAR and PO-SBAS technologies are largely consistent with the actual
subsidence trend,and the monitoring accuracy is superior to using either SBAS-InSAR or PO-SBAS technology alone. It indicates
that the integrating SBAS-InSAR and PO-SBAS monitoring is an effective method for obtaining complete subsidence information,
which can provide technical support for mining subsidence monitoring.