On System Identification Using Pulse-Frequency Modulated Signals

i ON SYSTEM IDENTIFICATION USING PULSE-FREQUENCY MODULATED SIGNALS Nonperiodic time quantization has proved very useful for the improvement of measurement and control systems. Very often nonperiodic time quantization is connected with pulse frequency modulation (PFM). In the present report some aspects of continuous system identification using PFM signals have been studied. Two possibilities for application of PFM signals in system identification are considered. In accordance with these possibilities either the system is excited by PFM signals or the system output is observed with the help of a pulse-frequency converter. For both these cases effective computational schemes for estimation of the transfer function and the weighting function have been obtained. For the case of the weighting function estimate, the relationship with previously obtained estimates has been established. The utility of the suggested estimates is illustrated by computer simulation. For this purpose, several programs are given in the appendix.