Key Features:
- The Sonar Transponder Module (STM), simulates the echo responses and acoustic signatures of a range of underwater targets
- Control of the STM is fully integrated into the Gavia user interface and mission planning
Benefits:
- Cost effective, reusable solution for ASW training
- Man portable and rapidly deployed
- Can be operated from standard Gavia vehicles configured for other tasks when not conducting ASW training
- Wide array of additional sensors available for Gavia AUVs
THE SONAR TRANSPONDER MODULE (STM), is a module for receiving and retransmitting sonar signals which allows for a standard Gavia vehicle to be configured as a Sonar Training Target (STT) for ASW training purposes. The STM consist of a flooded transducer compartment, an electronic compartment and a hydrophone that is towed behind the Gavia AUV and is capable of simulating preprogrammed target characteristics. The STM is programmable to emulate different type of realistic submarine target sizes and speeds for cost effective and re-usable ASW training capability.
Operation
The following operational modes are supported by the STM.
Echo repeat mode
The Sonar Training Target (STT) will for the sonar sensor look as a submarine travelling with the speed of the platform and with a maximum target strength of 20 dB, which is a typical medium size submarine.
Store repeat
When a sonar ping is detected by the STM, a pre-recorded echo is repeated. This mode gives the facility of full output power with no “sing around” problems, and a target strength of up to 40 dB can be achieved.
Target highlights
The echo can be manipulated the same way as a target with finite dimensions will do. Different targets can be defined and stored in a file with different aspect angle. When the platform is programmed to turn into a new leg of its sailing mission, an echo structure representing a different aspect angle of the target can be commanded to the STM.
Passive mode
The STM can output pre-stored pulses or pre-stored noise signals continuously or with intervals, and with varying level - either increasing or decreasing. This can be used for identifying a target among other targets, for simulating a torpedo attack or for warning surface ships when surfacing
Control
- Acoustic commands over an underwater telephone system (UWT/UQC)
- Over the horizon communications through Iridium
