New multifrequency ternary signals: First period frequency response measurement

This paper introduces a new set of multifrequency ternary sequence (MTS) si gnals, They are MTS octave signals, which are designed by frequency shift k eyed (FSK) modulation so that two separate parts of a frequency response ar e examined by one test signal. One of these signals is a new five-octave FS K MTS signal which is described by a total of 64 symbols. This is half the number of symbols required by the equivalent five-octave Van den Bos multif requency binary sequence (MBS) signal. There are four, five, six, etc., oct ave FSK MTS in the set, all of which have one important advantage over an e quivalent MBS signal. The switch-on transient is usually eliminated during the system identification of most systems by these signals. If it is not, t he measurement code may be rearranged in an asymmetrical form to further mi nimize the switch-on transient during the first period of the signal. This means that two sets of accurate frequency estimates are obtained immediatel y after the first period of these novel signals. During this first period, when these signals are generated with a symmetrical code, a useful multifre quency measurement in the form of a data pattern may also be obtained. It m ay be used to condition monitor two separate parts of the frequency respons e of a system. The advantages of the five-octave FSK MTS test signal are il lustrated with the aid of a recently developed data measurement toolbox usi ng a simulated process with three lags.