Secondary positioning transponder is used for underwater target location, it can respond to the call signal transmitted by the secondary positioning host, the secondary positioning host calculates the distance from the host to the transponder by recording the transmission time of the response signal, and then the software of the host computer calculates the coordinates of the transponder in the underwater.
The transponder is powered by a 12V dry battery. When the battery voltage is less than 9V, the battery needs to be replaced. The transponder needs to be encoded with an encoder before going underwater. The encoding is equivalent to writing address information to the transponder. When more than one transponder is needed for work, it is necessary to make sure that the address of each transponder can't be duplicated, or else the positioning result will be wrong.