公开(公告)号：US5134720A

公开(公告)日：1992-07-28

申请号：US646528

申请日：1991-01-25

申请人： Christopher J. Gamgee ,  Alan H. F. Nickols

发明人： Christopher J. Gamgee ,  Alan H. F. Nickols

IPC分类号： H03J1/00

CPC分类号： H03J1/0091

摘要： A signal locating apparatus for locating within a frequency band an input signal of a first frequency, the signal locating apparatus including a signal receiver for receiving the input signal. The signal receiver is characterized by having a relatively narrow bandwidth response of variable center frequency, the signal receiver being capable of generating a detected signal when the center frequency is substantially equal to the first frequency, the signal locating apparatus further including search device for varying the center frequency at a relatively high rate so as to cause the signal receiver to search for the presence of the input signal within a frequency band, the search device being operable in response to generation of the detected signal to stop the search for the presence of the input signal. The signal receiver includes an oscillator of variable frequency which determines the center frequency, a mixer receiving the input signal and operative to generate an intermediate frequency signal and a demodulator connected to receive the intermediate frequency signal and operative to generate the detected signal upon receipt of the intermediate frequency signal. The search device includes an integrator connected so as to receive the output signal of the demodulator so that the occurrence of the detected signal at the demodulator output causes an abrupt change in the integrator output.

摘要翻译： 一种信号定位装置，用于在频带内定位第一频率的输入信号，信号定位装置包括用于接收输入信号的信号接收器。 信号接收机的特征在于具有可变中心频率的相对窄的带宽响应，当中心频率基本上等于第一频率时，信号接收机能够产生检测信号，信号定位装置还包括用于改变 中心频率以相对较高的速率进行，以使得信号接收机在频带内搜索输入信号的存在，该搜索装置可响应于检测到的信号的产生而停止搜索， 输入信号。 该信号接收机包括一个确定中心频率的可变频率振荡器，一个混合器接收输入信号并且可操作地产生一个中频信号，一个解调器被连接成接收中频信号，并在接收到中频信号时产生检测信号 中频信号。 搜索装置包括一个积分器，连接成接收解调器的输出信号，使得在解调器输出处的检测信号的出现导致积分器输出的突然变化。