Maritime safety system
First Claim
1. A maritime safety system comprising:
- at least one transmitter unit, each transmitter unit being arranged to transmit successive signals by wireless communication at pseudo random intervals and each transmitter unit having an associated transmitter range;
a base station arranged to receive said transmitted signals; and
an alarm device;
said base station being arranged to cause the alarm device to generate an audible and/or visible alarm when a plurality of successive signals from a transmitter unit are not detected;
the arrangement being such that when a transmitter unit is disposed a distance from the base station which is greater than the transmission range associated with the transmitter unit and a plurality of successive signals are not detected from the transmitter unit, an audible and/or visible alarm is generated.
1 Assignment
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Accused Products
Abstract
A maritime safety system comprising at least one transmitter unit (12, 14, 16, 18), each transmitter unit being arranged to transmit successive signals by wireless communication at pseudo random intervals and each transmitter unit (12, 14, 16, 18) having an associated transmitter range, a base station (10) arranged to receive said transmitted signals and an alarm device (20). The base station (10) is arranged to cause the alarm device (20) to generate an audible and/or visible alarm when a plurality of successive signals from at least one of the transmitter units (12, 14, 16, 18) are not detected, and the arrangement is such that when a transmitter unit (12, 14, 16, 18) is disposed a distance from the base station (10) which is greater than the transmission range associated with the transmitter unit and a plurality of successive signals are not detected, an audible and/or visible alarm is generated.
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Citations
34 Claims
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1. A maritime safety system comprising:
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at least one transmitter unit, each transmitter unit being arranged to transmit successive signals by wireless communication at pseudo random intervals and each transmitter unit having an associated transmitter range;
a base station arranged to receive said transmitted signals; and
an alarm device;
said base station being arranged to cause the alarm device to generate an audible and/or visible alarm when a plurality of successive signals from a transmitter unit are not detected;
the arrangement being such that when a transmitter unit is disposed a distance from the base station which is greater than the transmission range associated with the transmitter unit and a plurality of successive signals are not detected from the transmitter unit, an audible and/or visible alarm is generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A base station for a maritime safety system, the base station being arranged to receive signals transmitted from at least one transmitter unit by wireless communication, and the base station being arranged to generate an actuation signal when a plurality of successive signals from at least one of the transmitter units are not detected;
the arrangement being such that when a transmitter unit is disposed a distance from the base station which is greater than a transmission range associated with the transmitter unit, a plurality of successive signals are not detected and the actuation signal is generated. - View Dependent Claims (20, 21, 22, 23, 24, 25)
- 26. A transmitter unit for a maritime system, the transmitter unit being arranged to transmit successive signals by wireless communication, each signal being transmitted at a pseudo random offset relative to a predetermined time interval so as to thereby reduce the likelihood during use of signal transmissions from two transmitter units occurring simultaneously.
Specification