对GPS接收机的天线来说，通常要接受多个定位卫星的扩频信号，并掺杂着一个或几个多个干扰。
For the antenna of GPS receiver, it is usually subject to a number of satellites positioning signals, and mixed with one or more interference.
目前已经能够研制出测量用户至卫星伪距信号的“北斗”用户接收机，此款接收机可以工作在无源定位的情况下。
The BD receiver can measure the pseudo distance between the satellite and the user, so that it can work in the passive positioning system.
目前已经能够研制出测量用户至卫星伪距信号的“北斗”用户接收机，此款接收机可以工作在无源定位的情况下。
The BD receiver can measure the pseudo distance between the satellite and the user, so that it can work in the passive positioning system.
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