BINARY CODES WITH IMPULSE AUTOCORRELATION FUNCTIONS FOR DYNAMIC EXPERIMENTS

A series of binary codes exist which have autocorrelation functions approximating to an impulse function. Signals whose behavior in time can be expressed by such codes have spectra which are whiter' over a limited bandwidth and for a finite time than signals from a white noise generator. These codes are used to determine system dynamic responses using the correlation technique. Programs were written to compute codes of arbitrary length and to compute cyclic' autocorrelation and crosscorrelation functions. Complete listings of these programs are given, and a code of 1019 bits is presented. (auth)