| 摘要 |
Systems and methods are described herein for a variable-depth sonar. A null in the frequency response between a first and second operating frequency band is identified. A center operating frequency for each of the first and the second operating band is adjusted based on the ambient pressure. Furthermore, the velocity state of a vehicle may be calculated using periodic velocity updates. At least one transducer transmits a first signal in a first direction, and a Doppler sensor receives an echo of the first signal. The vehicle is turned in a second direction, and the at least one transducer transmits a second signal in the second direction. Using the first and the second velocity measurement, a vehicle velocity state is calculated. |
