How to Convert the GPS vertical displacement to LOS displacement?

I want to Convert GPS vertical Displacement to LOS displacement. Please help me

You will need to project the displacement vector on the LOS vector.

Vector projection - Wikipedia

Dear Mengdahl,
In my study region only descending SAR data is available, using that data I calculated PS-InSAR LOS displacements. The problem is for calculating the SAR LOS to Vertical we need both ascending and descending orbit data, that’s way I want to convert my GPS vertical velocities to SAR LOS for better comparison.

Please suggest me is it correct or not?

Lateral movement on the GNSS-receiver can also have a LOS-component, so I guess you need to project the total movement vector and not just the vertical part.

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Is there any publications regarding this topic?