Developments in frequency-response determination using Schroeder-phased harmonic signals

A multi-frequency identification scheme employing Schroeder-specified relative phasing to achieve low-peakfactor excitation signals has been devised. These so-calledSchroeder-phased harmonic signals have been proposed as a convenient multi-frequency signal for frequencyresponse testing offering high-power with low peak-factor and a flexible choice of test spectrum. In this paper the use of these signals is extended to obtain frequencyresponse information from multi-variable and sampleddatasystems. Additionally there is a detailed discussion of the computational processes relevant to the use of these signals when the system output signals are contaminated significantly with noise.