华中科技大学学报（自然科学版）Issue(5)：122-127,6.DOI:10.13245/j.hust.140525
一种改进的非相干 GNSS 信号频率锁定方法
Improved non-coherent accumulation GNSS weak signal f requency tracking approach
摘要
Abstract
In order to realize high sensitivity GNSS (global navigation satellite system ) signal tracking in the environment of weak signal ,an improved non-coherent GNSS signal frequency locking method was proposed ,which solved the problem of navigation inversion to expand the available range of pow-er accumulation length and increase the signal to noise ratio .A frequency space calculation method was designed based on accumulated nonlinear weighing error to gain the optimum linear non-coherent discriminator which has the largest linear frequency discrimination range .By extending the coherent and non-coherent accumulation ,a high sensitivity frequency lock loop with a wide linear frequency dis-crimination range was realized ,which could be applied to improve sensitivity .After the theoretic anal-ysis and Monte Carlo simulation of the noise affection and the frequency convergence range ,it is claimed that the frequency tracking sensitivity is improved and the signal with power of -160 dBm can be steadily tracked without navigation estimation and with a certain accuracy .关键词
弱信号/锁频环/归一化/非相干累积/非线性偏差Key words
weak signal/frequency lock loop (FLL )/normalization/non-coherent accumulation/nonlinear error分类
信息技术与安全科学引用本文复制引用
阮航,刘峰,张磊,龙腾..一种改进的非相干 GNSS 信号频率锁定方法[J].华中科技大学学报（自然科学版）,2014,(5):122-127,6.基金项目
国家自然科学基金项目资助（61101128）． （）
