Ground-space VLBI Near-field delay model for LOVEX Project

Abstract

The Queqiao-2 relay satellite of the Chang’e-7 mission is equipped with a 4.2-meter radio telescope, which has successfully carried out a number of joint lunar-Earth ultra-long baseline VLBI observations with ground-based VLBI stations. For these observations, we computed both the ground-space VLBI-defined and DOR-defined geometric delay model. These models were used to obtain VLBI fringes, perform Delta-DOR. local correlation processing and extract Doppler frequency measurements.