Stacked Autoencoders for Outlier Detection in Over-the-Horizon Radar Signals

Algorithm 1

The proposed algorithm in pseudocode.

Input: OTH and AIS trajectories and other provided information for a set of past time instances

Output: matrix of the closest AIS entries to each OTH entry for a set of past time instances

FOR each time instance

FOR each tracked ship ,

FOR each AIS transmitting ship

Check difference in track time and AIS transmission time

Find corresponding time instances

IF

No AIS entry is matched to

ELSE

Run nn search using coordinates among and

Maintain 4 closest entries

END

END

END

END

Input: matrix of the closest AIS entries to each OTH entry for a set of past time instances

Output: array with indices of the matched AIS to each one of the OTH tracked vehicles

Initialize matrix FOR the votes

FOR each OTH tracked ship

FOR each time instance

IF ship had ship in the vicinity

END

END

END

WHILE AIS vessels remain unmatched

IF

KEEP AIS entry closest to OTH vehicle

END

Update

END