Precise Doppler shift measurement method based on motion radiation sources

Abstract

Motion radiation sources, especially space motion radiation sources such as satellite, missile and aircraft and so on, have the Doppler shift relative to the ground detection equipment. A real-time and accurate localization of motion targets can be achieved using the Doppler shift. To reduce the noise and improve the positioning accuracy of motion targets under complex backgrounds, a precise Doppler shift measurement method is proposed based on motion radiation sources. Using frequency tracking and synthesis techniques, the captured signals of the motion radiation sources are converted into radio frequency signals as the measured signal, and by coarse measurement method, the traditional pulse counting method, the frequency nominal value of the measured signal can be obtained, and will be used as the frequency standard signal comparing pulse phase with the measured signal. The precise Doppler shift measurement of the measured signal is implemented using a high-resolution different-frequency group quantization phase processing. The experimental results indicate that the frequency stability of the system reaches the 4.3E−12/s level. Compared to the traditional Doppler shift measurement method, it has the advantages of a low cost, fast response, good noise suppression, high measurement precision and strong system reliability. This method has an important application in radio detection and ranging, location, tracking, early warning and surveillance of space motion targets, weapon control and navigation positioning and other high-tech fields.