Marine emergency position indicating system

摘要

A marine emergency position indicating system that can communicate wirelessly between beacon and search engine is provided. When someone carrying the beacon falls into the water, power supply of the beacon opens through drowning automatic switch or manual switch, therefore the beacon can emit wireless SOS signals out. Rescue boat or aircraft installed with search engine can search and receive SOS signals sent from beacons over a 5-kilometer radius along the way to accidental site. The search engine can distinguish the beacons around this area and determine the direction and approximate distance between drowning persons carrying beacons and the search engine through wireless communication technology and wireless positioning technology to help rescuers implement fixed-point rescue. Therefore, the marine emergency position indicating system can overcome the bad weather impact on marine rescue, speed up the rescue process and improve the success possibilities of fixed-point rescue.

主权项

1. A marine emergency position indicating system comprising:
a beacon, carried by marine staff, configured to send out wireless communication signals after a ship wreck, the beacon containing a power supply circuit, a signal process circuit, and an antenna, which are electrically connected; a search engine, mounted in a rescue boat or an aircraft, the search engine receiving wireless communication signals from neighboring beacons within a certain range and having a signal demodulation module for user identification and conflict detection, and two signal process modules for calculating relative distance and direction of each beacon based on the communication signals; modules within the search engine indicating the beacon direction, the modules containing:
a direction finding antenna array, which contains multiple antennas according to the design of a distribution array, which respectively receive the wireless communication signals matched with the same beacon's emitting frequencies;an antenna signal process module having a change-over switch, the change-over switch integrating multi-channel signals from the multiple antennas of the direction finding antenna array into one channel;a mixer amplifier module, which converts the integrated one channel signal output from the antenna signal process module to a pre-set frequency and amplifies this signal in the whole signal range to a pre-set amplitude, wherein the antenna signal process module transmits the integrated one channel signal to the mixer amplifier module through one long distance cable; and
a direction finding data process module, which samples the signals output from the mixer amplifier module on time-division base, recovers the multi-channel signals received from the direction finding antenna array, calculates phase differences of the multi-channel signals, and determines the relative direction between the sending beacon and the search engine.