Towed Arrays

Thin-Line Digital Array

The M509 Hydrus Towed Array is a thin line digital array. The array streams digitized acoustic and non-acoustic sensor data. Hydrus is a low noise, low drag, low power and lightweight array making it ideal for towing from an unmanned vehicle. The Hydrus array can also be customized with greater than 64 channels. The array and tow cable are neutrally buoyant to support low speed tow. Hydrus includes acceleration cancelling hydrophones to minimize mechanical noise. The array is user configurable to less than 2.5 kHz sampling rate, and high/low acoustic channel gain to tailor performance to various applications. Non-acoustic sensors include depth, temperature, roll, pitch, and yaw.

Applications vary from marine surveillance, marine monitoring, anthropogenic noise monitoring, and detection applications.

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Description

ACOUSTIC

  • Frequency Band: 10-3200 Hz
  • Max # of Acoustic Channels: 255
  • Acoustic Channel Sensitivity: -196 dB re V/μPa
  • Sampling Rate: Up to 8.0 kHz (dependent on # of channels)
  • User Configurable Channel Gain: Two settings (Hi/Lo)
  • Acoustic Channel Gain: 10 and 32 dB (0-32 dB customizable on order)
  • Self Noise SPL Equivalent @1 kHz: 35 dB re V/μPa
  • Digital Interface: UDP Ethernet Stream 10BASE-T1L

MECHANICAL/ELECTRICAL

  • Max Operating/Survival Depth: 300 m
  • Nominal Array Diameter: 45 mm
  • NAS Sensors: Depth, Temperature, RPY
  • Nominal Power Consumption Per Channel: 200 mW
  • Supply Voltage: 24-96 VDC
  • Array/Tow Cable Buoyancy: Neutrally buoyant
  • Tow Cable Length: Up to 1000 m
  • Operating Temperature: 0-40°C
  • Preamp Self-Noise Level: <sea state zero (SSO)
  • Max Cut Frequency (Min Sensor Spacing): 4 kHz

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