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Main ❯ Navigation & tracking systems ❯ RedWAVE: Databrief
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RedWAVE Data brief |
General information
RedWAVE - the only system in the world based on patented* technology that implements the so-called “underwater GPS”, following the ideology of satellite navigation systems as closely as possible, it allows an unlimited number of underwater objects, such as divers and various mobile robots (ROV, AUV, etc.) to determine its geographical location and depth in real-time.
RedWAVE is a long-base (LBL, long-baseline) navigation system. The floating navigation base is formed by four small-sized sonobuoys RedBASE; an unlimited number of underwater objects equipped with navigation receivers RedNODE and divers using diving navigators RedNAV can work simultaneously with the support of the base.
* Patents US10989815B2, WO2017044012A1, EP3349040A4, RU2599902C1.
System composition
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RedBASE GNSS-equipped sonobuoy |
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RedNODE Navigation receiver |
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RedNAV Diver’s navigation received |
The minimum composition of the system includes four sonobuoys RedBASE and one receiving device, depending on the user task:
- If you want to provide navigation data to the diver, then use the diving navigator RedNAV;
- If it is required to estimate the location of the remote-controlled device (ROV, AUV), then the navigation receiver RedNODE is used, which is interfaced with the vessel, and the data generated at the receiver must be transmitted via the cable of the device to the control panel, where they can be displayed on any mapping software that supports the connection of standard GNSS receivers (RMC and GGA messages).
Tasks that the system solves
- Simultaneous estimation of 3D geographical position by an unlimited number of underwater objects (divers, ROV, AUV, etc.);
- Recording tracks of divers moving;
- Pre-loading waypoints, navigation to loaded points, saving (marking) the current position of the diver;
Distinctive features
- Work in absolute geographical coordinates;
- A floating base of four sonobuoys is enough for an unlimited number of navigation receivers;
- No preliminary adjustment and calibration of the system and its components is required;
- Small size and power consumption of navigation receivers;
- Emulation of the protocol of standard GNSS receivers for integrated devices
Geometric restrictions
In view of the fact that RedWAVE system uses modern technology of digital broadband acoustic communication, the signals emitted by buoys have a significant duration (about 200 milliseconds). The buoy’s signals have time and code division multiplexing, and in view of the finiteness of the speed of sound propagation in water and the period of emission of signals, under certain conditions, the signals can overlap each other at the receiving point. There are also limitations associated with the physical basis of the long navigation base. Therefore, the system has a restriction on the relative position of navigation sonobuoys, and navigation receivers relative to buoys:
- From each to each of the buoys there should be no more than 700 meters and not less than 30 meters
- Buoys should be located with a convex quadrangle so that its sides are approximately equal and differ by no more than 2 times
- Maximum immersion depth of navigation receivers should not exceed the size of the navigation base
- The highest accuracy of the system is achieved inside the figure of buoys, and work should always begin inside this figure. Going beyond the limits of the figure is possible, however, the accuracy can significantly decrease as the positioned object moves away from the figure of buoys