[Main](/) ❯ [Navigation & tracking systems](/navigation_and_tracking_systems_en) ❯ **Zima2-BK: Device specification**
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[support@unavlab.com](mailto:support@unavlab.com) | **Zima2-BK** - **Zima2 USBL** direction-finding station
Device specification | ## KEY FEATURES * **Extremely small size and weight** * **Communication range up to 3000[1](#footnote1) m** * **Highly reliable digital underwater acoustic communication resistant to multipath propagation** * **Code division multiple access - up to 16 responder-beacons** * **Low power consumption (Rx/Tx) 0.5/10 W** * **Built-in pressure/temperature sensor** * **Patented[*](#footnote_a2) monoblock design** ## DESCRIPTION **Zima2-BK** - direction-finding station of the ultra-short baseline system [Zima2 USBL](Zima2_DataBrief_en.md). The device uses a fixed-length signal with code division to determine the direction, range and depth of responder-beacons [Zima2-RK](Zima2RK_Specification_en.md). With an external **GNSS** receiver and compass, the device determines the absolute coordinates of the responder-beacons. Up to 16 responder-beacons can be operated sequentially. The ideal solution for determining the direction and distance to **ROVs**, **AUVs** and **divers**. Extremely small size, low power consumption and ease of use make the direction-finding system [Zima2 USBL](Zima2_DataBrief_en.md) an ideal solution for working with autonomous and remotely controlled vehicles, as well as determining the relative position of divers. _________ * Patent RU2659299C1.
## TECHNICAL SPECIFICATIONS | PARAMETER | VALUE | | :--- | :--- | | DIMENSIONS (Ø x h) | 64 x 128 mm | | WEIGHT (dry)[2](#footnote2) | 0.44 kg | | MAXIMUM DEPTH | 40 m | | NOMINAL DEPTH ACCURACY | 0.1 m | | MAXIMUM ACOUSTIC COMMUNICATION RANGE[1](#footnote1) | 3000 m | | NOMINAL HORIZONTAL ANGLE OF ARRIVAL ACCURACY[3](#footnote3) | 1° | | SLANT RANGE MEASUREMENT RESOLUTION | 0.15 m | | MAXIMUM DEVICE TILT RELATIVE TO THE VERTICAL COMPENSATED BY THE BUILT-IN INCLINOMETER (ROLL/PITCH) | +/- 30° | | OPERATING CONE (RELATIVE TO THE HORIZONTAL)[3](#footnote3) | 0 .. 85° | | ACOUSTIC SOURCE LEVEL | 170 dB re 1 μPa @ 1 m | | CARRIER FREQUENCY | 20100 Hz | | BUILT-IN TEMPERATURE SENSOR ACCURACY | 0.1°C | | BIT ERROR RATE | 10-6 | | SNR[2](#footnote2) | -3 dB | | MAXIMUM RELATIVE VELOCITY | +/- 2 m/s | | STARTUP TIME | 100 ms | | OPERATING TEMPERATURE RANGE | -5 .. 50 °C | | BATTERY LIFE[4](#footnote4) WHEN SUPPLIED FROM [BAT&LINK BOX](Bat_n_link_box_Specification_en.md) | 8 h | | POWER CONSUMPTION (Rx/Tx) | 0.5 / 10 W | | INTERFACE | USB (COM) 9600 bit/s | | COMMUNICATION PROTOCOL | NMEA 0183 [PAZM](Zima2_Protocol_Specification_en.md) | | CABLE LENGTH[5](#footnote5) | 10 m | | MAXIMUM NUMBER OF RESPONDER-BEACONS | 16 | ________________ 1 A parameter that determines the maximum range at which a signal can be received, based on electro-acoustic parameters of the transmitter and receiver, spatial decrease in the intensity of sound energy, attenuation in the medium and the acoustic noise level. 2 Excluding the weight of the converter and cable. 3 The value was obtained in a laboratory static experiment, without taking into account the multipath propagation effect. 4 With the station operating at 1 request per 3 seconds. 5 Including the interface converter and extension cable up to the [Bat&Link Box](Bat_n_link_box_Specification_en.md) device. Optionally, the length can be increased up to 20 m.