A smart card is formed of a memory having light-sensing cells to sense externally supplied light and generate a detection signal in response to the externally supplied light being sensed by the light-sensing cells, and a reset control circuit generating a reset signal in response to the detection signal, the reset signal operating to reset the smart card. In a preferred embodiment, the system comprises a management system, a database with a table of users and a table of data associated with each user, a message input and recognition system for written messages, voice messages, or text messages, etc. For example, instead of coding the data to be sent in the phase of the UWB signal, the data is encoded in a binary fashion in discrete frequency subbands of the UWB signal. Sixteen microstrip antenna elements equally spaced around the projectile provide for linear polarization and a quasi-omni directional radiation pattern.