A key component in Sonardyne’s SIPS 2 System, XSRSs (Cross Streamer Ranging System) are intelligent acoustic devices used to measure one way slant range distances underwater.
The Type 8018 is equipped with a direct reading sound speed sensor. This ‘time of Flight’ sensor provides superior accuracy and ease of use compared to the more traditional CTD methods, particularly in areas affected by fresh water and salt water mixing.
The units are battery powered and are mounted on the streamer sections using industry standard collars. The XSRS units communicate with the XSRS controllers by means of the inductive coils and communication circuit within the streamers.
The design of the XSRS is based around a proprietary application specific integrated circuit (ASIC). The ASIC enables the decoding of the digital acoustic signal using digital signal processing (DSP) techniques. The unit has four receiver channels and one transmit channel.
Each receiver is capable of receiving 1 of 60 unique digital signals. The use of digital acoustic signals and digital processing techniques enable the XSRS to transmit and receive signals in the same event. In addition, they are able to transmit and receive SIPS 1 style tone burst for cross wake ranges.
The Type 8018 XSRS units are powered by individual standard C-size alkaline or long-life lithium cells. The XSRS units have been designed to be very energy efficient, with over 80% of the available battery power being transmitted into the water.
|Operating Frequency||EHF (55-110kHz)||EHF (55-110kHz)||EHF (55-110kHz)|
|Transmit Source Level (Controllable)||Max. 190dB re 1µPa @1m||Max. 190dB re 1µPa @1m||Max. 190dB re 1µPa @1m|
|Receive Sensivity (Controllable)||73dB re 1µPa @1m||73dB re 1µPa @1m||73dB re 1µPa @1m|
|Acoustic Range Resolution||5mm@ 1500 ms Vp||5mm@ 1500 ms Vp||5mm@ 1500 ms Vp|
|System Sync Resolution||75mm @ 1500 ms Vp||75mm @ 1500 ms Vp||75mm @ 1500 ms Vp|
|Immunity to Multipath||System can resolve bottom bounce/surface bounce greater than 0.3m|
|Number of Digital Acoustic Signals||60||60||60|
|Number of Tone Acoustic Signals||6||6||6|
|Number of Received Channels||4||4||4|
|Sound Velocity Range||1400 – 1600 metres/second|
|Sound Velocity Resolution||0.01 metres/second|
|Sound Velocity Accuracy||Total max theoretical error +/-0.06 metres/second|
|Battery Life (Typical)||5-6 Weeks||9-11 Weeks||15-18 Weeks|
|Weight In Air||7.3kg||–||–|
|Weight In Water||3.0kg||–||–|
Integral direct reading sound speed sensor
Choice of Alkaline, Lithium or Long Life Lithium batteries
Compatible with HGPS transceiver
Capable of receiving 16 ranges per cycle
Designed to transmit to an unlimited no of units
Flash upgradeable firmware
Sealed electronics compartment