Marine Emergency Position Indicating System

A marine emergency position indicating system is characterized in that the said system includes the following parts:

• beacon, carried by the marine staff, can send out wireless communication signals after ship wreck;
• the said beacon contains power supply circuit, signal process circuit and antenna, which are electrical connected;
• search engine, mounted in rescue boat or aircraft towards the accident site the said search engine receives wireless communication signals from all neighboring beacons within a certain range and has 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 said search engine indicating the beacon direction contains:
• direction finding antenna array, which contains multiple antennas according to the design of distribution array, which respectively receive the wireless communication signals matched with the same beacon's emitting frequencies;
• antenna signal process module, which integrates the multi-channel signals from the receiving antennas of the mentioned direction finding antenna array into one channel;
• mixer amplifier module, which converts the integrated one channel signal output from the mentioned antenna signal process module to a pre-set frequency and amplifiers this signal in the whole signal range to a pre-set amplitude;
• 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 mentioned search engine.