Research on Wireless Positioning System Based on the Principle of Phase Interferometer and its Implementation

This paper expounded the basic principle of phase interferometer system, established positioning model of one-dimensional double-base line, improved the bearing accuracy and solved the fuzzy problem. The whole circuit of the positioning system was designed, radio signal communication was implemented by RF transceiver chip, low frequency signal was used as signal frequency to modulate it to carrier, the antenna radiated electromagnetic wave to the outside, main station were used to identify whether the corresponding signal were useful signal or not, useful signal received by two slave stations went through filter, amplification and mixing to obtain two ways of IF signal which then were input into phase demodulator respectively, distinguished potential difference of two phase to get a more precise phase according to the proportion of baseline, again using the relationship between phase and azimuth to get the information of target location. According to the plan, control system was designed and a lot of related experiments were made, the experimental results showed that the system was applicable to the direction of elevation which did not exist and had certain applications and development value.