Abstract
In the adaptive control system, the response of process is measured in real time and is improved inaccordance with the parameter variation. Since the measurement is performed in the normal operating condition, the so-called statistical method is used. In conventional statistical method, much care has never been paid to the fact that the measurement must be performed in the finite length of time, and it has been taken into consideration that the mean valve of sufficiently long time becomes constant within the range of statistical variance. This method that uses the maximum length sequence has no error in the measurement in the finite length of time and has several advantages such as simple handling and easy estimation of measuring accuracy. As this method handles the sampled data almost with addition only, the calculating time is negligibly short if there is used the digital computer or so. The test signal is binary and can be produced by the relays or cam and is smaller than in the pulse testing method.
