The frequency hopping system based on software radio, DSP is used to generate quasi-stochastic sequence and control the output frequency of DDS to construct required hopping maps.
跳频方案采用软件无线电技术，采用DSP作为伪码发生器，控制DDS输出频率，得到相应的跳频图案。
2
Based on analysis of the field tests data, crushing ice forces on vertical structures are classified into three modes: quasi static ice force, steady state dynamic ice force and stochastic ice force.
The spatial correlation functions of the regular distribution structure, quasi-regular distribution structure and stochastic distribution structure are calculated.