Research And FPGA Design Of Ultra-wideband High-precision Positioning Algorithm

The future wireless positioning technology trends to achieve seamless and accurate position with combined of indoor and outdoor positioning. The Ultra-Wideband technology emerges from many wireless positioning technologies and becomes the hotspot of the future wireless positioning technology due to its low power consumption, good anti-multipath effect, high security, low system complexity, and high positioning accuracy, etc.Based on the Ultra-Wideband technology and positioning technology, a high-precision time-measurement positioning algorithm was proposed in this paper and consequently a set of high-precision indoor positioning system was designed. The dissertation’s researches involved four aspects as follows:1. A high-precision time measurement algorithm based on the variable group delay filter was proposed. Based on the study of existing positioning algorithm, a high-precision measurement was proposed by using of the polyphase filter or multi-group delay filter in the waveform processing, which was combined with the TDOA technology to achieve a high-precision indoor positioning algorithm. Simulation results showed that the positioning accuracy can reach5cm or less.2. A novel positioning system architecture was proposed to solve problem of time synchronization. With adding a main station connected with the reference station by a fiber, the time synchronization between the reference stations of the TDOA algorithm was achieved and the position frames were send.3. A overall program of the high-precision positioning system was proposed. With the proposed parameters and target of the system, the system architecture was planned and also the function modules and signal flow were designed. And the thesis also focused on the ultra-high-speed sample rate and data transmission.4. Completed the design of the base-band digital signal processing with the FPGA platform, which including the transmitter of the main station and receiver of the user terminal. With the described function and interface signals of each module, the thesis focused on designing the ultra-high-speed data (?)ate’s synchronous capture and tracking.