对软件无线电来说，功率和频率都由软件控制。
For software radio, the power levels and the frequency are controlled in software.
周一整晚，任务控制组只会收到一系列的无线电“声音信号”——以不同频率发出的持续三秒的信号——告知太空船正在执行的一系列任务。
Through Monday evening, mission control will receive only a series of radio "tones" — three-second bursts at different frequencies — telling the sequence of operations the spacecraft is performing.
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。
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。
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.
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