CAJ | 학술논문

根据GPS软件接收机对数据块进行信号处理的工作方式,研究基于快速博里叶变换的循环相关法伪码快速捕获与跟踪技术.基于实测GPS中频数据,采用循环相关法在频域计算输入信号与本地信号的相关值,由相位关系得到精细载频.仿真结果表明,该技术能减少运算量,缩短捕获时间.得到的载频能满足跟踪环对频率分辨率的要求.对跟踪结果进行子帧匹配和奇偶校验后,可以获得导航电文信息.
근거GPS연건접수궤대수거괴진행신호처리적공작방식,연구기우쾌속박리협변환적순배상관법위마쾌속포획여근종기술.기우실측GPS중빈수거,채용순배상관법재빈역계산수입신호여본지신호적상관치,유상위관계득도정세재빈.방진결과표명,해기술능감소운산량,축단포획시간.득도적재빈능만족근종배대빈솔분변솔적요구.대근종결과진행자정필배화기우교험후,가이획득도항전문신식.
According to the working mode of GPS software receiver to do signal process on data block, this paper studies fast acquisition and tracking technology for fake code of circular correlation method based on Fast Fourier Transform(FFT). Based on CPS intermediate frequency data getting by operational test, circular correlation method is used to calculate correlation value of input signal and local signal in frequency domain.Fine carrier frequency is obtained by phase relation. Simulation results show that this technology can reduce computation quantity and shorten acquisition time. The obtained carrier frequency can meet the tracking loop's demand about frequency resolution. Navigation information can be obtained through sub frame match and parity check of tracking result.