| High resolution dynamic frequency measurement is an important content of the output pulse frequency measurement of High precision optical gyro,of which the measurement precision directly affects the precision of the gyroscope.Intensive study of the Real-time dynamic frequency measurement technology featuring High precision and high resolution is of great significance to the development of high precision optical gyro.Multistage phase-locked frequency multiplication technology and the vibration source de-noising technology are both important technologies to realize dynamic frequency low noise amplifier and high precision measurement,of which the core is to restrain the phase noise of PLL and eliminate the carrier frequency phase noise interference.According to the Requires Target,the whole system was designed,the theoretical calculation and simulation analysis of PLL as well as its phase noise were conducted and the prototype was developed.Finally,the feasibility of the system was verified.The main contents of this paper include as follows:1)Generation of Reference datum frequency.To realize Ultra high frequency multiplication factor,multistage phase-locked frequency multiplication is needed.After each frequency multiplication,carrier frequency needs to lower down,which needs to mix the reference frequency and carrier frequency,which is an important research contents of this paper.2)Target standardization of PLL and universal design method.Through computational analysis of phase noise of classic PLL,The simplest model for calculating the noise was drawn out.The computing method of target standardization was put forward as the evaluation criterion,and General design steps and methods of the classic charge pump PLL was carried out.3)Phase noise analysis and suppression method of PLL.Through study of noise influence factors of all parts of PLL as well as theoretical calculation,circuit design,integrated simulation and analysis to restrain the noise.To get the best comprehensive performances of the system by optimize the loop bandwidth and loop noise.4)Development of High resolution ultra-low frequency signal dynamic measurement system.Based on the former works,printed circuits board was designed,and then experimental platform was established.Finally,measurement and verification of the prototype was done,which indicated that prototype could fulfill the requirements of precision,measurement band-width and dynamic measurement bandwidth of gyroscope,which verified the validation of High resolution dynamic measurement system. |
