摘要
为提高GPS信号的捕获速度,研究了基于快速傅里叶变换的并行码相位快速捕获技术,在原算法的基础上进行了二级处理,对频率细化从而减小了相关值衰减,使其更适用于工程应用。采用该技术在频域计算输入信号与本地信号的相关值,并得到相关峰值所对应的载波频率和码相位。Matlab仿真结果表明,该技术可以成功的捕获GPS卫星的C/A码信号并减少运算量,乘法和加法的运算次数是传统顺序搜索算法的0.112 3%和0.215 7%,有效的缩短了信号捕获时间。
In order to accelerate the acquisition speed of GPS signal,a method based on parallel code-phase acquisition is presented,and a secondary treatment is taken based on the existent method.Frequency space is made smaller to reduce the attenuation of correlation peak,and more available to engineering application.Using this method,the correlation value of input signal and local signal is calculated in frequency domain,and the carrier frequency and code phase are available according to the correlation peak.Simulation result of Matlab indicates that this method can capture the C/A code signal of GPS satellites and reduce the computational complexity successfully.The computational complexity of multiplication and addition is 0.1123% and 0.2157% of traditional method.Meanwhile,with this method,the time of capturing signal is shortened effectively.
出处
《电子设计工程》
2012年第8期150-152,156,共4页
Electronic Design Engineering
关键词
GPS卫星
快速捕获
载波频率
码相位
GPS satellite
fast acquisition
carrier frequency
code phase
