The author also makes some Suggestions for frequency selection of digital carrier and parameters selection of spectrum shaping filter.
对数字载波的频率及频谱成形滤波器的特性参数的选择提出了建议。
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But to the CW pulse signal with changing carrier wave frequency, common filter cannot achieve narrowband filter, whereas broadband filter cannot reach the request of the signal-noise ratio.
Because of the frequency lock loop traction PLL filter can be designed very narrow, with very good noise suppression performance, to meet the precise requirements of carrier phase tracking.