Abstract: An apparatus for judging a fatigue level and/or a dozing state of a person by capturing voices uttered at different points of time from a microphone 5M. A computer performs chaos analysis of the digital data of the inputted voices and calculates Lyapunov exponents and judges a fatigue level and/or a dozing state based on the result of the chaos analysis.

Abstract: A control target surveillance system capable of acquiring positional data of a control target in a control zone at high precision with fewer communications lines in a short period of time. A D. GPS ground station obtains differential data with respect to positional data based on a GPS signal from a GPS satellite, and sends this data to a control target to compensate the positional data obtained from the GPS signal. A surveillance cycle is time-divided by the number of SSR codes, individual time slots are associated with the SSR codes, and each control target is allowed.