Autonomous hydrographic and bathymetric surveys USV.


The APACHE 4 is an Unmanned Surface Vessel (USV) that supports a wide variety of Acoustic Doppler Current Profiler (ADCP) systems available on the market. It offers an unmanned operation solution with a shallow draft, high navigational accuracy, and stable hovering for hydrologists when measuring water flow velocity and discharge of a current section. Very compact, it enables easy handling at the mission site, facilitates safe launching, and convenient transportation by car.

The APACHE 4 USV brings together the best of high-accuracy positioning and automated navigation control technology built around the operator’s habits when conducting ADCP hydrographic cross[1]section flow measurements. The built-in adaptive water flow and hovering navigation technology significantly improve the accuracy of flow estimation. Even when GNSS positioning might be degraded by the obstructed environment, the internal GNSS+IMU module continues to provide a reliable position and heading for the ADCP and autopilot controller.

The APACHE 4 is a perfect solution for obtaining high-quality data for flow and velocity measurements in water where manned boat access is impractical, such as in front of dam structures, or where safety is a concern, such as during flood level measurements.



Integrated adaptive water flow straight-line and hovering technology

The autonomous control system enables APACHE 4 to navigate straight along the cross-section according to the profile view when the flow rate, turbulence, etc., changes. The hovering technology can make APACHE 4 hover stably in the turbulent flow at the start and end points of ADCP observation, thereby improving the accuracy of flow estimation.


Versatile. Carries up to 35 kg of payload

The APACHE 4 central access shaft design provides unmanned cross-sectional flow measurement solutions for the leading ADCPs on the market. The APACHE 4 is particularly suited for hydrologists using ADCP sensors such as the M9, RTDP 1200, RiverPro, and RiverRay, who are looking for an integrated, portable, and affordable unmanned solution. It does not only carry the ADCP but also provides its positioning, orientation, power, waterproofing, network, and 4G transmission solutions.


Expand your unmanned survey capability

Single beam sounding data can be used to verify the accuracy of ADCP bottom tracking data and even fed directly into the ADCP flow measurement software to compensate for the unavailability of ADCP data, and at the same time, provides water depth profile data associated with the flow velocity profile measurement.


Uninterrupted positioning with GNSS+IMU

APACHE 4 provides a stable position and heading to the ADCP and autopilot. Its IMU sensor ensures the availability of position data even during momentary GNSS signal loss. The obstacle avoidance radar system and live video feed ensure safe operations in case of loss of visibility or difficult environmental conditions. Completely autonomous, the APACHE 4 is safely operated from the shore. The AutoPlanner and HydroSurvey software suite allows the operator to define the entire mission, from the survey area to the export of the results.



Hull dimension (L × W × H)1200 mm x 750 mm x 400 mm
MaterialMacromolecule polyester carbon fiber
Weight (w/o instrument and battery)13 kg
Maximum payload35 kg
Anti-wave & Wind3rd wind level and 2nd wave level
Hull designTriple-hull vessel
Water proofIP67
Draft12 cm
Indicator LightTwo-color light (Display satellite and positioning status)
Camera360° omnidirectional video
ADCP Mounting aperture240 mm
ADCP CompatibilityCompatible with M9, RiverPro, RiverRay, RioGrande, RCP and other navigable ADCP
Monted DeviceADCP and sounder are equipped at the same time. Expandable sampling, water quality meter, side scan.
SafeShoal automatic astern, millimeter-wave radar automatic obstacle avoidance, low battery auto return, signal loss auto-return
Obstacle avoidance distance0.2-40 m


Propeller typeBrushless DC
Direction controlVeering without steering engine
Maximum motor power800 W
Maximum motor speed7200 rpm
Li-ion battery capacity4 x 23.1Ah 32.4 V 1 x 15 Ah 18 V
Battery endurance2 x 3 hours @ 2 m/s (running on 2 battery sets, support hot-swap)
Maximum speed6 m/s


Data communicationNetwork bridge: 1 km and 4G: unlimited
R/C communication2.4 GHz
Remote control range1 km
SIM Card slotNano SIM


Interface2 x RJ45 port 3 x RS232 serial port 1 x PPS
Navigation modeManual or Auto-Pilot
Water proof of master controlIP67
Data storageLocal multi-sessions and FTP push


Satellite systemBDS B1/B2, GPS L1/L2, GLONASS L1/L2, Galileo E1/E5, QZSS
Single point position (RMS)Horizontal: 1.5 m Vertical: 2.5 m
SBAS Positioning accuracyHorizontal: 0.5 m Vertical: 0.85 m
DGNSS positioning accuracyHorizontal: 0.4 m + 1 ppm Vertical: 0.85 m + 1 ppm
RTK Positioning accuracyHorizontal: ±8 mm + 1 ppm Vertical: ±15 mm + 1 ppm
Heading accuracy0.2 ⁰ @1 m baseline
Inertial navigation accuracy6 ⁰/ h
IMU update rate200 Hz

D270 Single Beam Echo Sounder

Data typeCHCGD (1), NMEA SDDPT/SDDBT, original waveform
Weight0.84 kg
Sounding range0.15 m to 200 m
Sounding accuracy±0.01 m + 0.1% x D (D is the depth of water)
Resolution0.01 m
Frequency200 KHz
Beam angle6.5° ± 1°
Supply voltage10-36 V DC/ 100-20 V AC


Hydro SurveyData collection and post-processing. Support coordinate conversion, trajectory, water depth, waveform real-time display, post-processing support waveform overlay and attitude correction.
Auro PlannerRoute planning, autonomous navigation, hull parameter control, multi-angle video display, and system self-test at power-on.


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