Signal direction of arrival estimation apparatus, adaptive array, the received signal processing apparatus and positioning device

摘要

PROBLEM TO BE SOLVED: To provide a device capable of estimating the signal arrival direction by using a plurality of receivers, without taking out synchronously a carrier signal from each receiver to the outside of the receiver, and without using the same reference clock, and acquiring analog offset and performing its calibration automatically.;SOLUTION: An accumulated delta range (ADR) acquired by tracking the carrier phase of a received signal outputted from each GPS receiver 5a, 5b...5i is read, and the angle spectrum of an arrival signal is determined on the basis of the ADR by, for example, MUSIC method, and the direction of the arrival signal is estimated. The analog offset of each GPS receiver is detected and calibrated. In addition, a directivity pattern of an array antenna is allowed to have a desired shape by multiplying a signal from each element antenna by a complex weight, and highly accurate positioning is performed on the basis of only a desired wave.;COPYRIGHT: (C)2005,JPO&NCIPI