The invention relates to the fields of a broadband full-polarized antenna array sensor device and a direction finding technology thereof, and especially to a full-polarized interferometer based on spatial sampling antenna array and a parameter estimation method of the interferometer, and the interferometer is used radio systems as radars and communication. The interferometer is characterized by using a six-unit ultra-wide-band linear polarization antenna array, two types of ultra-wide-band linear polarization antennas, namely ultra-wide-band log-periodic antennas and ultra-wide-band Vivaldi antennas are included, and the ultra-wide-band log-periodic antennas correspond radiation of a current source and the ultra-wide-band Vivaldi antennas correspond to radiation of a magnetic current source to reduce electromagnetic coupling among the units; and the amount of antenna units is 6, each antenna unit is of a linear-polarization antenna form, the units form a ring array, the six units of linear-polarization antennas are arranged in the radial manner according to a circular center, and the antenna units have spatial orientations different from one another. The interferometer and the parameter estimation method are suitable for spaceborne, airborne, missile-borne and other radio direction-finding systems, parameter measuring functions are more comprehensive, and the platform adaptability is higher.