DRM信号用于短波探通一体化的试验研究

Experimental study on the integration of HF communication and channel detection based on DRM signal

对短波探通一体化方法进行了试验研究,并选用数字调幅广播(digital radio mondiale,DRM)信号作为一体化信号.对试验接收信号进行处理分析后,验证了一体化方法对真实信道环境的适用性.同时还发现,在多模式传播的情况下,各模式多普勒频移相同时脉冲压缩副瓣能量会导致时延提取产生误差,进而影响信号校正效果.并且,副模式的时延展宽同样会影响信号校正效果.通过分析可知,带有时延展宽的副模式的相对衰减越小,对校正效果影响越大,并通过与传统导频估计修正的方法对比得出,一体化方法对多模式传播的信号校正效果更好.该研究为后续探索短波探通一体化技术提供了理论和实践依据.

In this paper,the integrated method of HF communication and channel detection is studied through experiments for which digital radio mondiale signals are selected as an example of integrated signals.Based on the processing and analysis of the received data of the experiments,the applicability of the integrated method to the real channel environment is verified.Meanwhile,in the case of multimode propagation,it is found that,when the Doppler shift of each mode is identical,the pulse compression side-lobe energy can lead to the error associated with time delay extraction and subsequently affect the performance of signal correction.Moreover,the time delay broadening of the sub-mode also affect the signal correction effect.The analysis shows that the smaller the relative attenuation of the sub-mode with time delay broadening,the greater the effect on the signal correction.Compared with the traditional pilot estimation method,the integrated method has a better effect on the signal correction of multimode propagation.The research of this paper provides theoretical and practical basis for the follow-up exploration in the integrated technology of HF communication and channel detection.