Frequency hopping spreading code phase tracking method suitable for narrowband interference

一种适用于窄带干扰的跳扩码相位跟踪方法

Abstract

The invention discloses a frequency hopping spreading code phase tracking method suitable for narrowband interference. The method comprises the following steps: generating a local frequency hopping code word and a local spreading code word; de-hopping received frequency hopping spreading signals; performing low-pass filtering and draw-off on the de-hopped signals to obtain data with a reduced rate; carrying out digital automatic gain control on the data with the reduced rate to obtain data with basically constant amplitude; performing rotation amount control, i.e., controlling the rotation amount of phase rotation; performing the phase rotation on the data with the basically constant amplitude; performing de-spreading on the data after the phase rotation; accumulating the data after the de-spreading, and finding an accumulative mode maximum value and a corresponding phase rotation amount; and performing phase adjustment amount accumulation, i.e., accumulating all phase adjustment amounts, and performing division on an accumulation result and a clock period of a local reference clock to obtain a quotient and a remainder value, for performing overall reference clock period adjustment on a local frequency hopping spreading code phase and performing adjustment within one reference clock period on the local frequency hopping spreading code phase according to the remainder value.
一种适用于窄带干扰的跳扩码相位跟踪方法,步骤为:生成本地跳频码字和本地扩频码字;对接收的跳扩信号进行解跳;对解跳后的信号进行低通滤波和抽取,得到降速率的数据;对降速率的数据进行数字自动增益控制,得到幅度基本恒定的数据;旋转量控制对相位旋转的旋转量进行控制;对幅度基本恒定的数据进行相位旋转;对所述的相位旋转之后的数据进行解扩;对解扩之后的数据进行累加,并找到累加模最大值及对应的相位旋转量;相位调整量累加所有相位调整量进行累加,并将累加结果和本地参考时钟的时钟周期做除法,得到商值和余数值,用于对本地跳扩频码相位进行整参考时钟周期调整以及用于对本地跳扩频码相位按照余数值进行一个参考时钟周期内的调整。

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