* Question
| Research and design of underwater wireless sensor networks Compared with terrestrial wireless sensor networks, what are the technical difficulties? |
* Answer
| 1) The most important difference between underwater wireless sensor network and ground sensor network is the difference of communication transmission medium. Underwater communication is transmitted through the acoustic channel, while the ground is transmitted by electromagnetic waves. The acoustic communication channel has severe attenuation and delay., easy to generate underwater ranging error,
2) The underwater sensor is susceptible to movement due to other factors such as water flow, and the movement of the node is usually unpredictable, which causes the position coordinate of the node to change rapidly, and the coordinates of the previously positioned node are easily disabled. 3) Since the underwater sensor node usually adds more sensing components and some underwater transceiver devices in hardware design, the cost of the underwater sensor device is increased, and because the seawater has a certain salt and alkali, the design is alsoNeed to be corrosion resistant and waterproof, compared to ground sensor nodes, 4) Due to the intermittent nature of the underwater channel, the underwater sensor node needs to cache the data, which has certain requirements on the storage capacity of the underwater sensor node, and the computing capacity of the sensor node is limited, so that the underwater sensor networkThe positioning algorithm complexity should be as low as possible. |
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