SYSTEM FOR LOCATING AND DISPATCHING MOBILE AMBULANCE CREWS

摘要

FIELD: physics.;SUBSTANCE: system comprises Navstar navigation system satellites. A transponder with a transceiving antenna is installed at the centre of the city. There is a dispatch station with known coordinates, an ambulance and fixed equipment installed on profile medical institutions. The dispatch station has a receiving antenna, a GPS signal receiver, a radio station with a transceiving antenna, an interface unit, a computer with a display and a documentation device. The on-board system of the ambulance has a receiving antenna, a GPS signal receiver, a radio station with a transceiving antenna, an interface unit, a microprocessor, additional information sensors and an on-board display. The fixed equipment installed on profile medical institutions includes a radio station with a transceiving antenna, an interface unit and a microprocessor. Each GPS signal receiver has a high frequency amplifier, a heterodyne, a mixer, an intermediate frequency amplifier, two multipliers, a narrow band-pass filter and a low-pass filter. Each radio station has a microprocessor, an interface unit, a driving generator, a discrete message source, a phase manipulator, an analogue message source, an amplitude modulator, two heterodynes, a first intermediate frequency amplifier, two power amplifiers, an antenna switch, three mixers, two second intermediate frequency amplifiers, an amplitude limiter, a synchronous detector, two multipliers, a band-pass filter, a phase detector, a +90° phase changer, a -90° phase changer, an adder, a narrow band-pass filter, an amplitude detector and a switch. The system facilitates exchange of discrete and analogue messages between dispatchers, ambulance crews and doctors on hospitals and polyclinics by suppressing false signals (noise) received from mirror and combinational channels.;EFFECT: high noise immunity and reliability of messaging.;4 dwg