Technique for Measurement of Cross-Spectral Density of Two Random Functions

Abstract

The cross‐spectral density of two functions may be determined by using two selective filters which have identical impulse responses except for a relative phase difference which should be 0° and 90° for the measurement of cosine and sine components, respectively. A technique is developed which is quite accurate and requires a minimum of special equipment. The operation of the system is checked by measuring the cross‐spectral density of two functions whose statistical properties are known