SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD AND PROGRAM

摘要

In order to improve the stability of a numerical calculation for finding the continuous phase of a set of signal sequences, provided is a signal processing device (10) wherein a spline calculation unit (13) approximates a set of signal sequences acquired by a signal acquisition unit (11) by spline functions, respectively, and an unwrapping processing unit (18) performs phase unwrapping using polynomials in each interval of the obtained spline functions. The phase unwrapping is performed according to a procedure in which a polynomial sequence calculation unit (15) calculates a polynomial sequence by applying a Euclidean algorithm to the polynomials of the spline functions, a sign counting unit (17) checks the number of changes of the sign of a numerical sequence formed by arranging the values of the polynomial sequence at a point at which the phase is found in each interval, and an unwrapping processing unit (18) determines an indefinite portion that is an integral multiple of pi on the basis of the number of changes.