Method and system for estimating along-track effective baseline of interferometric synthetic aperture radar

The invention discloses an along-orbit effective baseline estimation method and system for an interferometric synthetic aperture radar, and the method comprises the steps: obtaining the orbit data and main and auxiliary satellite images of main and auxiliary satellites in a set time period, and obtaining the orbit equation of the main and auxiliary satellites through polynomial fitting; calculating the offset between the main and auxiliary satellite images, determining the starting time of main and auxiliary satellite imaging based on the offset, and respectively obtaining the imaging time of each row in the azimuth direction of the main and auxiliary satellite images; establishing a relation function between the along-track effective base line and the azimuth uplink numbers of the main and auxiliary satellite images; and on the basis of the orbit equations of the main and auxiliary satellites and the imaging time of each row in the image azimuth of the main and auxiliary satellites, estimating along-orbit ef