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high-precision positioning system based on RDSS and RNSS is designed for the positioning of aircraft or marine vessels. Through the analysis of positioning, communication module selection and related technical principles, the system design scheme of using Beidou module to achieve drop-off positioning is put forward. The system uses RNSS positioning to communicate through RDSS. In order to improve the frequency of short message communication, the scheme design of rotating communication of dual Beidou module is adopted. In order to cope with the drop-off area and the complex environment during the flight of the aircraft and improve the quality of positioning and short message communication, the system uses a 10W PA power amplification module to amplify the RDSS communication signal. The positioning system consists of beacon machine and ground receiving equipment. Beacon machine is responsible for positioning and RDSS communication, ground receiving system is responsible for processing data to achieve the location of debris. The system can be detected by practical application, the communication frequency can be increased to 2 times/min, the communication drop rate is less than 5%, and the system adopts GPS/Beidou dual-mode positioning technology, the positioning accuracy can be better than 5m. Beacon machine designed internal charging circuit, can repeatedly charge the device, large-capacity lithium battery can ensure that beacon machine can work long hours, the maximum working time can reach 3h. The system solves the problem of aircraft and marine ship positioning, which has the characteristics of strong real-time, high communication frequency, high positioning accuracy, small size, strong application and high transmission power。