CAJ | 학술논문

针对时间同步系统短波校时失败的现象，给出了一种数模结合实现的相关自动增益控制(AGC)电路模型。短波校时接收机采用超外差接收机方案，结合短波授时的特点，找到校时失败的原因。介绍了短波授时的信号格式，分析了模拟非相关自动增益控制电路对接收机的影响---模拟的自动增益控制电路容易使传输信号的幅度和相位发生畸变，并且对输入信号的响应时间慢。最后通过分析计算，建立了数模结合的相关自动增益控制电路模型。实验测试结果表明，采用此设计的短波校时接收机能解决信号格式及信道失真引起的短波校时的不同问题，对短波校时接收机的设计具有指导作用。
침대시간동보계통단파교시실패적현상，급출료일충수모결합실현적상관자동증익공제(AGC)전로모형。단파교시접수궤채용초외차접수궤방안，결합단파수시적특점，조도교시실패적원인。개소료단파수시적신호격식，분석료모의비상관자동증익공제전로대접수궤적영향---모의적자동증익공제전로용역사전수신호적폭도화상위발생기변，병차대수입신호적향응시간만。최후통과분석계산，건립료수모결합적상관자동증익공제전로모형。실험측시결과표명，채용차설계적단파교시접수궤능해결신호격식급신도실진인기적단파교시적불동문제，대단파교시접수궤적설계구유지도작용。
The model of coherent automatic gain control(AGC) circuit combining digital and analog method is given to solve the failure of time calibration in the synchronization system. The shortwave receiver adopts the scheme of super heterodyne receiver to find out the reasons of failure according to the characteristics of shortwave timing service. The signal format of shortwave timing service is introduced,the effect of analog noncoherent AGC circuit on the receiver is analyzed that the AGC circuit may distort the amplitude and phase of signal while the response time of the input signal appears to be slowed. The coherent AGC circuit model combining digital and analog method is established through analysis and calculation. The test results prove the effectiveness of the designed shortwave timing receiver. The method provides reference for desig-ning shortwave timing receivers.