1. A synthetic aperture radar system for monitoring ground and structure movements, said system comprising at least the following mechanical and electronic components: a ground based platform including a measurement interferometric and polarimetric sensor, an embedded power supply and connection unit, a linear positioner provided with a movable carriage, and a measuring head; an embedded main system control unit, an embedded electromagnetic wave generator and receiver module controlled by said unit, comprising a continuous—wave stepped—frequency scatterometer, a motor control and managing unit, an embedded UPS module including an embedded buffer battery; an I/O managing module, an embedded calibrated videocamera or photocamera, an embedded. GPS receiver module, an embedded display and an alphanumeric keypad, an embedded LAN module, an embedded mass storage module, an embedded GSM/GPRS/UMTS module, an embedded WLAN module, and embedded standard interfaces for assembling laser scanners and topographic instrument reflectors; whereby all the mechanical components of said system are provided with unique reference marks and points or connections, characterized in that, to perform a measurement, said measuring head is initially driven along a linear track with a constant speed in an “on the fly” acquisition mode of operation; and wherein during a constant speed movement, the system acquires data needed to process a single radar image.