But these signal problems of range-Doppler coupling and low data ratio are still not solved completely although some encouraging results have been obtained and applied in the radar system design.
现代雷达为获得较高的距离分辨力通常采用编码频率脉冲串信号和步进频率脉冲串信号，但都存在数据率低和较为严重的距离-多普勒耦合问题。
Each discrete piece of data requires a lot of structure, and the ratio of data to structure is extremely low.
每个离散的数据片断需要大量结构，所以有效数据的比例非常低。
Because of complex fracture system, faulted structures, and rich igneous rocks, SXF area is a representative low signal-to-noise ratio seismic data region in Subei basin.
苏北盆地的SXF地区是典型的低信噪比地震资料地区，断裂系统复杂，构造破碎，圈闭面积小，火成岩发育。
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