Which configuration involves using an along keel transmit array and an across keel receive array?

The configuration that involves using an along keel transmit array and an across keel receive array is known as the Mills T configuration. This setup is designed for efficient mapping and surveying of underwater features. The along keel transmit array is oriented parallel to the keel of the vessel, allowing for effective transmission of acoustic signals along the length of the vessel, while the across keel receive array is positioned perpendicular to the keel, enabling it to capture reflections from the seabed over a wide swath.

This unique arrangement facilitates better data collection by optimizing the angle of reception relative to the direction of the transmitted acoustic pulse. It can provide enhanced resolution and detail in the resulting data, making it particularly useful in hydrographic surveys where accuracy and coverage are paramount. The combination of transmission and reception angles helps to mitigate some of the limitations faced by other survey configurations, resulting in a more comprehensive understanding of the underwater terrain.