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AN/BQG-5 Wide Aperture Array

The AN/BQG-5 Wide Aperture Array is a flank array on the SSN-688 Los Angeles attack submarines. With the following exceptions, there are no differences in the acoustic models used to generate Flank (WAA) array data.

The first of these exceptions is that this array has a variable upper frequency limit. A special table in the sensor suite data file stores array upper frequency limits which are a function of array geometry and target location. The Flank array model first retrieves an arrival angle from the prop loss tables based on target depth and range, own ship position, propagation path, and a selected frequency specified in the sensor suite data file. The target bearing and arrival angle are then used to select an upper frequency limit. This frequency is then used as the upper frequency range for subsequent SNR calculations. From this point on the modeling is identical for all arrays.

The second exception which is made for flank arrays is that the panels of the array are spatially distributed. From a detection standpoint, the array is treated as a single receiver, however the user can specify an array spacing parameter which is used to generate receive delays for each panel. Mid-bow and mid-stern delay times are generated based on target bearing, and range. These delay times can then be used by TMA algorithms to generate range estimates for a given target.

Finally, the Flank array requires an initial detection from either the towed or spherical arrays to initiate Flank detection processing. Once the Flank array has been steered to a taret from an initial towed or spherical bearing, it will attempt to detect a contact.

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Updated Saturday, December 12, 1998 7:17:49 AM