Systems and methods for decoding automatic identification system signals
First Claim
1. A method of extracting, from at least one signal received by a satellite, message segments employed in the maritime communications Automatic Identification System (AIS), the method comprising:
- (a) receiving at least one AIS signal from at least one satellite antenna;
(b) generating multiple versions of the at least one AIS signal;
(c) extracting message segments contained within each of the multiple versions of the at least one AIS signal using at least one AIS receiver, wherein each message segment comprises at least a Maritime Mobile Service Identity (MMSI);
(d) sorting the message segments by time; and
(e) deleting any duplicate message segments.
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Abstract
A method of extracting automatic identification system (AIS) message segments from AIS signals received by a satellite. The method includes: (a) receiving AIS signals from satellite antennas; (b) generating multiple versions of the AIS signals; (c) extracting message segments contained within each of the AIS signals using one or more AIS receivers; (d) sorting the message segments by time; and (e) deleting any duplicate message segments. Multiple versions of the AIS signals may be generated by one or more of the following methods: (i) processing the AIS signals multiple times, each time with different AIS receiver parameter settings; (ii) splitting each signal into multiple signals and filtering each of the multiple signals separately; (iii) receiving multiple AIS signals and combining them with different phases and amplitudes to produce a plurality of combined AIS signals; and (iv) removing extracted message segments from the received AIS signals and reprocessing the modified AIS signals.
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Citations
20 Claims
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1. A method of extracting, from at least one signal received by a satellite, message segments employed in the maritime communications Automatic Identification System (AIS), the method comprising:
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(a) receiving at least one AIS signal from at least one satellite antenna; (b) generating multiple versions of the at least one AIS signal; (c) extracting message segments contained within each of the multiple versions of the at least one AIS signal using at least one AIS receiver, wherein each message segment comprises at least a Maritime Mobile Service Identity (MMSI); (d) sorting the message segments by time; and (e) deleting any duplicate message segments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification