Nortek Signature100vm low
Nortek Signature VM Ocean 55k Hz frontview
Figure 7
IMG 20210823 091134
Nortek Signature100vm low
Nortek Signature VM Ocean 55k Hz frontview
Figure 7
IMG 20210823 091134

Vessel mounted

Signature VM Ocean - 100 kHz

Delivers vessel-mounted ADCP capabilities with an optional scientific echosounder for biomass measurements.

Overview

Until now, epipelagic and mesopelagic VM ADCP surveys could not deliver the resolution, precision or range to examine the ocean boundary layer in detail. To study biomass in the upper-ocean boundary layer, you had to add a separate scientific echosounder.

Nortek’s vessel-mounted Signature VM Ocean in the 100 kHz version opens up new opportunities to measure currents and to study biomass simultaneously. The 55 kHz version offers long-range current profiles with a proper precision.

  • Currents
  • Echosounder
  • Bottom track

Highlights

  • A coherent and modern system that is quick and convenient to operate
  • Automated processing
  • VM or stand-alone applications
  • A novel transducer design allows focusing on measurement precision (75 kHz) and a 1000 m profiling range (55 kHz)
  • Four beams for current profiling with a range over 300 m (100)
  • Optional scientific echosounder with multiple modes for biomass (100)

Usage

  • Offshore operations
  • Internal waves
  • Upper-ocean boundary-layer studies (100)
  • Detection of krill or plankton in the water column (100)
  • Deep-water current profiles, ocean discharge (55)

Setup

The 100 and 55 kHz units are typically mounted inside the hull or in a lowered structure attached to the hull, such as an instrument gondola. Nortek has a mounting guide available.

Deployment

View current velocity data in real time from the VM acquisition software while onboard the vessel. Gather long range current speed and direction information with the 55 kHz unit or use the 100 kHz unit for intermediate profiles and biomass estimates.

Data

Biomass estimates of fish and krill and detections of internal waves with the optional 100 kHz scientific echosounder can be further processed using Echoview software. Process and export current data subsets of interest using the VM review software once your survey has ended.

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Profiling range**

300-400 m

Doppler processing

Broadband & Narrowband

Cell size

3-15 m

Max no. cells

200

Min. blanking

2

Minimum accuracy

1.0% of the measured value ± 0.5 cm/s

Velocity resolution

0.1 cm/s

Maximum sampling rate

1 Hz (1/3 Hz with BT and echosounder)

Velocity range (along beam)

5 m/s

No. of beams

4 slanted at 20°

**) Depending on acoustic scattering condition.

Profiling range**

685/1000 m

Doppler processing

Broadband/Broadband & Narrowband

Cell size

6-20 m

Max no. cells

200

Min. blanking

2

Minimum accuracy

1.0% of the measured value ± 0.5 cm/s

Velocity resolution

0.1 cm/s

Maximum sampling rate

1 Hz (1/3 Hz at max power)

Velocity range (along beam)

5 m/s

No. of beams

3 slanted at 20°

**) Depending on acoustic scattering condition.

Single ping std @ 3 m/s

TBA

Long-term accuracy

TBA

Minimum altitude

5 m

Maximum altitude

560 m

Velocity resolution

0.01 mm/s

Maximum sampling rate

1 Hz (1/3 Hz with VP and echosounder)

Single ping std @ 3 m/s

TBA

Long-term accuracy

TBA

Minimum altitude

50 m

Maximum altitude

1200 m

Velocity resolution

0.01 mm/s

Maximum sampling rate

1 Hz

Sampling

Same as velocity for slanted beams

Resolution/dynamic range

0.5 dB/70 dB

Dynamic range

70 dB slanted beams

Transducer acoustic frequency

100 kHz

No. of beams

4 slanted at 20°

Beam width

6.1°

Sampling

Same as velocity

Resolution/dynamic range

0.5 dB/70 dB

Dynamic range

70 dB slanted beams

Transducer acoustic frequency

75 and 55 kHz

No. of beams

3 slanted at 20°

Beam width

4.5°-5.5°

No. of beams

1 vertical

Transducer acoustic frequency

70-120 kHz

Sampling

1 Hz (1/3 Hz with VP and BT)

Transducer beam width

15° @ 70 kHz, 8.7° @ 120 kHz

Resolution

0.375 –4 m

Resolution/ dynamic range

0.01 dB/130 dB

Transmit pulse

Monochromatic 70 kHz, 90 kHz and 120 kHz or frequency chirp (90 kHz, 50% BW)

Transmit power

7.5-120 W adjustable

Chirp signal processing

Pulse compression or binned frequency response

No. of beams

N/A

Transducer acoustic frequency

N/A

Sampling

N/A

Transducer beam width

N/A

Resolution

N/A

Resolution/ dynamic range

N/A

Transmit pulse

N/A

Transmit power

N/A

Chirp signal processing

N/A

Temperature sensor range / accuracy

-4 °C to 40 °C / 0.1 °C

Pressure

Piezo resistive

Standard range

0-1500 m (inquire for options)

Accuracy/precision

0.1% FS / Better than 0.002% of full scale

Compass and tilt

Solid-state magnetometer and accelerometer

Data recording

16 GB (inquire for options)

Data cable

30 m Ethernet cable (inquire for options)

IO

Ethernet

DC input

15-48 V DC

Temperature sensor range / accuracy

-4 °C to 40 °C / 0.1 °C

Pressure

Piezo resistive

Standard range

0-1500 m (inquire for options)

Accuracy/precision

0.1% FS / Better than 0.002% of full scale

Compass and tilt

Solid-state magnetometer and accelerometer

Data recording

16 GB (inquire for options)

Data cable

30 m Ethernet cable (inquire for options)

IO

Ethernet

DC input

48 V DC

Maximum diameter

460 mm

Maximum length without room for internal batteries

350 mm

Maximum diameter

650 mm

Maximum length without room for internal batteries

314 mm

Operating temperature

-4 °C to 40 °C

Storage temperature

-20 °C to 60 °C

Vibration

IEC 60068-1/IEC60068-2-64

EMC approval

IEC 61000

Depth rating

1500 m – Bottom track is limited to surface vessels

Connectors

Straight fitted MCBH6F (Ethernet)

Housing

Small instrument housing

Material

POM with titanium fasteners

Processor/memory

Intel i5/8 GB

Hard disk

SSD, 500 GB

Operating system

Windows® 10

Housing

Half 19" 2 HE case or 19" rack-mountable 1 HE

Dimensions

265x110x340 mm or 480x45x325 mm

Input

24 V DC, 20 W typical

Total weight

5.75 or 3.80 kg

Connections

Power, Signature ADCP, AN_GNSS, 2x HDMI, 2xLAN, 3x USB, 1x RS-232 (optional)

Acquisition

Signature VM - binary, GNSS compass - binary

Timing

< 0.6 s, IEEE1588/PTP for absolute time stamping (GNSS/Signature VM)

Configuration

Signature VM (partly) GNSS Advanced navigation

Display

Vessel track in map, Bottom-track velocity, Bottom-track depth, Velocity magnitude and direction, Echo amplitude (slanted beams), Echo correlation (slanted beams), corrected relative volume backscatter (100)

Status

Signature VM + AN_GNSS compass

Output

NMEA data strings online CSV, ASCII VMT, MATLAB VMT, MATLAB, KML

Accelerometer dynamic

± 2 g

Gyro dynamic range

± 250°/sec

Magnetometer dynamic range

± 1.3 Gauss

Pitch and roll range/resolution

± 90° (pitch), ± 180° (roll)/0.01°

Pitch and roll accuracy

± 2° (dynamic)3), ± 0.5° (static, ± 30°)

Heading range / resolution

360°, all axes/0.01°

Heading accuracy

± 3° (dynamic)3), ± 2° (static, tilt < 20°)

Sampling rate

Same as measurement rate

Signature 100 Online 2x MCBH, NGA061-015 Rev.-
Signature 55 VM General Arrangement

Declaration of conformity
Declaration of conformity - Signature VM
Declaration of conformity - Signature 55
Environmental test report, Vibration test - Signature 55
Statement of Compliance - Signature 55

Signature100 VM Ocean

Signature55 VM Ocean

4-beam head (100)

3 beam head (55)

5-beam head (adds 95 kHz center transducer for echo sounder)(100)

Short, no room for battery (external battery canister for bottom-mount use) (same as currently stated; same for 100 and 55)

16 GB SD card data logger (same as currently stated; same for 100 and 55)

64 GB SD card data logger (same as currently stated; same for 100 and 55)

128 GB SD card data logger (same as currently stated; same for 100 and 55)

Pressure sensor, 0-1500 m, accuracy 0,1% of FS (standard) (same as currently stated; same for 100 and 55)

Pressure sensor, 0-100 m, accuracy 0,1% of FS (same as currently stated; same for 100 and 55)

AD2CP: 30 m Ethernet cable with MCIL6MP, Power/RJ45 at dry end (standard) (same as currently stated; same for 100 and 55)

AD2CP: 30-100 m Ethernet cable (specify length) with MCIL6MP-PWR/RJ45 (same as currently stated; same for 100 and 55)

Vessel-mounted over the side (same as currently stated; same for 100 and 55)

Vessel hull-mounted (same as currently stated; same for 100 and 55)

Unmanned Surface Vehicle (USV) mounted (please inquire) (same as currently stated; same for 100 and 55)

Compass and tilt sensor

AHRS

Heading GNSS (dGNSS),

High Accuracy Heading GNSS (RTK)

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