Because high-speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed.
由于高速数据占用更宽的带宽，所以在调制制式上应该寻找一种适合于跳频通信特点的具有高频谱效率的调制方案。
On account of the wide relative bandwidth, compared with the narrow-band system, large-band SAR system errors impose more severe effect on imaging quality.
由于相对带宽很大，与窄带系统相比，宽带SAR系统误差对成像的影响更严重。
A method of designing linear frequency modulated (LFM) signals with wide bandwidth and an experimental system that can generate many complex waveforms are presented.
文中不仅给出了宽带线性调频(LFM)信号的具体设计方法，而且给出了可产生多种复杂波形的实验信号产生系统及其主要技术指标。
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