METHOD FOR RADIO COMMUNICATION BETWEEN PROTECTED OBJECTS AND CENTRALIZED GUARD STATION Russian patent published in 2006 - IPC G08B25/10 G08B29/12 H04B1/713 

FIELD: engineering of equipment for transmitting signals of periodical and emergency alarm, possible use for realization of radio communication between guard center and protected objects.

SUBSTANCE: in guard center for each protected object a necessity for sending control signal is estimated, binary signal code is generated and transmitted with a command message, which is received at protected object. In each protected object in binary code handshaking, controlling or alarming messages are generated and transmitted to guard center. In guard center on basis of received alarming message a non-standard event is detected and adequate decision is taken. During transmission from each protected object of any message, expected time interval is determined between moments of transmission start for current message and next message of current protected object and bearing frequency of next message, and also moments of receipt of new messages from each one of protected objects and bearing frequencies of these messages are recorded. During generation of messages, transition from logical zero to logical one is performed by appropriate shift of bearing f. during approach of current time to recorded moment of receipt of new message from one of protected objects, broadband signals receipt is performed, input frequencies band is transferred to lower frequencies spectrum, analog-digital conversion is performed and intervals of frequencies, close to frequencies, at which in expected message symbols of logical one and zero are to be transferred, are singled out. If expected message is not received, in singled out frequency areas measures are taken, adequate for measures when alarming message is received from protected object. If message is received, by means of serial shift of time interval of digital filtration, moments of bit changes in message are determined and also time offset from the beginning of message, received message is decoded and actions are performed, adequate for its content. It also checked, whether aforementioned actions require sending a control signal to protected object. If such a requirement is present, command message is formed, containing a controlling signal, and transferred at frequencies of logical zero and one in the message received by guard center. At protected object after finishing transmission of message during a preset time interval, receipt of command from guard center is expected at same frequencies, at which the last message was transmitted from protected object.

EFFECT: possible increase of effective radius of alarm signaling equipment, used for protecting objects, with consideration of real active limitations on radio frequency nominal values and power of transmitters emission.

6 cl, 3 dwg