Undersea Sensing, Communications, Imaging, Control and Navigation Solutions for Naval Forces
ERAS Sonar Test System Low-logistics echo repeater, transponder, and monitor for acoustic tests and evaluation
ERAS Sonar Test System

Low-logistics echo repeater, transponder, and monitor for acoustic tests and evaluation

Our technology partner Chelsea Technologies develops the echo repeater acoustic source system (ERAS), a compact and flexible sonar test system that is a low-logistic alternative to support the calibration of both low and high frequency sonars. Mobilised from small vessels or vessels of opportunity, the collocated projector and hydrophone can also be used for test and evaluation as well as to train sonar operators. Visit Website Contact
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ERAS Sonar Test System

ERAS is a commercial-off-the-shelf instrument used to echo repeat, transpond, monitor and produce complex calibrated transmissions. This compact instrument is used to simulate different noise signatures including sonar pings, ship noise, movement, and Doppler effects. It is ideally suited for test and evaluation exercises, as well as to calibrate passive and active sonars for range and detection, and to evaluate novel concepts of operations.

Key features:

  • Transmits custom calibrated signals over a wide frequency range.
  • Replies at a calibrated source level and range.
  • Monitors incoming signals, records and repeats them. The echo repeat mode is triggered in response to an acoustic signal or an operator request.
  • It is compact and can be mobilised from a small RHIB.

ERAS operates across a broad range of Low to High Frequencies. Using the following two bands:

  • Band 1 Low Frequency (LF) – 3 kHz to 23 kHz
  • Band 2 High Frequency (HF) – 23 kHz to 50 kHz

In addition, ERAS can transmit at up to 171 dB re 1 µPa@1m with a flat transmit response to within ±1.5 dB across these two frequencies bands. The LF source level can be increased to 180 dB re 1µPa@1m between 7 kHz and 19 kHz.