| Ultra Short Base Line Positioning System realizes positioning, tracking and data transmission of the target underwater, using the technique of acoustic positioning. The display console is an important software running on the system's host processor, in charge of controlling and coordinating the movement of acoustic measurement system, GPS and attitude equipment; calculating the position of the target; and displaying motion of the carrier and the target in real time. In order to rate the system's operating performance, it is important to study highly efficient software techniques applied to the display console, which is also serviceable to the development of alike software.The display console of this system is developed under the environment of Visual C++; applying ActiveX controls for the interface communication to implement system control and data transmission; designing a new structure of data storage to meet the demand of measured data's dynamic increase; combining with the multithread processing, putting forward a method of graphic refreshing with no flicker to realize the parallel display of multiple graphs; using the dynamic link library to accomplish the basic positioning calculation, the conversion between geographic coordinate and geodetic coordinates, the rotation transformation of the coordinate and the correction of the sound velocity; embedding an emulation module to establish an unattached testing environment for the software system.The display console of the Ultra Short Base Line Positioning System fulfills the predefined requirements, and runs well with other peripheral equipments in the experiment. The software techniques and the algorithms of acoustic positioning are all validated. |
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