First Null(第一零点), 此释义来源于网络辞典。
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depth of first null 第一零点深度
First Down Null-Fill 第一下零点填充
The system's frequency stability and target's Doppler effect, which mainly influence high range resolution technique, were also analyzed. The first null velocity was calculated.
对影响该高距离分辨率技术的系统频率稳定度和目标多普勒响应进行了分析，计算出目标第一零值点速度。
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