LDHA-2523 is a rugged, bottom-lay, passive acoustic line array with 32 (or 48) digital hydrophones.  The hydrophones are evenly spaced by 1.5 m along the array cable and are simultaneously sampled with a bandwidth of 10 - 1400 Hz. Gain is software selectable from 20 - 90 dB in 10 dB steps.  This array consumes less than 3 W of power while maintaining an input referenced noise level well below Sea State 0.

Concept of Operation

The LDHA-2523, connects to an Array Receiver (AR) which converts the electrical array data to a fiber optic cable link that runs to an Array Receiver Controller (ARC).  The ARC is selected based on the end-user operational requirement and is available as an RF surface buoy, shore station, or ship-board interface.  Two arrays can be deployed in the coverage area and connected to the same operator station for wide-area tracking and detection.  The system is small, light-weight and deployable from a small craft. The array sends data over a standard Ethernet link. For real-time monitoring operations, Omnitech Electronics can provide customers with sonar operator software or array data can be integrated into existing software packages.  The ARC can also be configured for battery operated autonomous detection and continuous acoustic recording.

Hydrophones

The LDHA hydrophones contain integrated digitization and communication electronics and acoustic sensor.  The hydrophones are wired to the array cable and over-molded with the same thermal plastic urethane as the cable jacket resulting in a continuous, abrasion resistance design. Each hydrophone contains a 3-axis orientation sensor with magnetic and acceleration readings that can be used to determine the deployed array shape to assist with array calibration and beam-forming.