【Key words】 BPSK； direct IF sampling； digital correlation； matched filter； pulse compression； spread-spectrum； IFF；
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文中提出了基于直接中频采样的数字化GPS接收机码捕获电路。
A digital GPS PN code acquisition circuit based on direct IF sampling is presented.
提出用二分项采样法实现直接中频采样，而数字式检波器采用数字内插法。
It was suggested that direct intermediate frequency sampling was approached by two branch sampling, otherwise digital product detector was adopted to digital interpolation.
为满足高性能信号处理技术要求，需要直接对中频信号进行采样来得到正交双路信号。
To satisfy the requirement of high performance signal processing technique, it is demanded to use the direct sampling of IF signal to get quadrature signals.
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