【摘要】 基于调频广播的无源定位系统中,其信号是非合作的非平稳信号.考虑调频广播的发射原理,指出了调制信号停顿时信号距离分辨率下降的问题.采用信号求导的方法可简便地确定停顿期,并利用停顿期信号置零的方法提高了距离分辨率.这种方法计算量小,易于实时处理,对外场数据处理验证了所提方法能有效地提高距离分辨率.更多还原

【Abstract】 In the passive location system based on the FM broadcast,signals are uncooperative and non-stationary.With the generation theory of the signals taken into account,it is pointed out that the range resolution of the modulated signals declines because of the intermission of modulating signals.The method for confirming intermission based on the derivative of the signals is presented.The method for setting the intermission to zeros is analyzed to improve the range resolution.The results of the procession of the field data validate the proposed method to improve the range resolution with low computation and easy real-time procession.更多还原