Analysis of Receiving Performance of Loran-C Underwater Navigation Signal
The operation of underwater vehicles necessitates the implementation of navigation systems,which are re-sponsible for the provision of positional data and the delivery of navigational services.It is not possible to provide effective satellite navigation services in an underwater environment,as the signals in question are unable to enter the water.In re-sponse to the demand for underwater navigation applications for underwater vehicles,the underwater variation characteristics of Loran-C signals are analyzed and an underwater Loran-C signal reception method is proposed.Firstly,the land propaga-tion capability of the Loran-C system is investigated.Secondly,the influence for the Loran-C signal in an underwater envi-ronment is explored.Finally,the influence of dispersion effects on signal strength and perimeter difference under different water depth conditions is analyzed in detail.The simulation results demonstrate that as depth increases,the third cycle identification point of the underwater Loran-C signal is shifted forward,and the perimeter difference increases.Further-more,the perimeter difference of the Loran-C signal exceeds the usage limit after 3 m underwater,resulting in signal un-availability.
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