左房室瓣由二个主瓣构成。
The left atrio-ventricular (mitral) valve consisted of two main cusps.
主瓣：它是一个辐射波瓣，其中含有最大辐射的方向。
Main lobe: This is the radiation lobe containing the direction of maximum radiation.
另外，本文给出了为消除主瓣干扰而对和差方向图影响的模拟结果。
In addition, simulation results are given to show the effect of reject the main lobe interference on the sum and difference patterns.
同时根据方向图主瓣半功率波束宽度要求确定其单元数和单元间距。
At the same time under the direction of Figure lobe half-power beam width of the main requirements to determine their unit number and unit spacing.
计算结果表明，它们的主办下降、主瓣展宽和信噪比损失相差不大。
The results of: calculation show that there are little differences between'the mainlobe degradation, the mainlobe widening, and the signal to noise ratio loss.
并借助计算机绘出了主瓣宽度和副瓣电平与天线主要参数的关系曲线；
With the aid of a computer, curves of beamwidth and side lobe versus the antenna parameters are plotted.
主副瓣连合区分为单主瓣和副瓣间连合区及联合主瓣和副瓣间连合区。
The commissural region of the main and accessory valve can be divided into the commissural region between single main valve and accessory valve, and between united main valve and accessory valve.
本文对均匀直线阵列天线在相控扫描过程中的主瓣宽度和方向性系数进行了估算。
In this paper, the main valve width and directive gain for uniform linear array of antennas in phased scanning are estimated.
文章考虑了阵元宽度对主瓣半功率点宽度的影响，并与忽略阵元宽度的线列阵的情况进行了比较。
This paper studies the effects of array element width on half-power bandwidth, and proposes a new method.
副瓣：除了主瓣其它所有的瓣都被称作副瓣，这些副瓣展示的都是不必的辐射或没有用方向的辐射。
Minor lobe: all the lobes other then the main lobe are called the minor lobes. These lobes represent the radiation in undesired directions.
在自适应波束形成技术抑制干扰问题中，当存在主瓣干扰时，便暴露出两个缺陷：一是副瓣电平增高；
There are two disadvantages in adaptive beam forming in the presence of main lobe interference, one is heightening of side-lobe level, the other is distortion and peak offset of main beam.
窄带系统中使用的波束形成技术对于宽带系统来说是不合适的，因为他们会导致主瓣偏斜和零陷偏移。
The beamforming techniques used in narrowband systems are inadequate for wideband systems because they result in main-beam squinting and null shifting.
结果表明，W - O方法得到的信号频谱比传统加窗具有更少的旁瓣干扰和更高的主瓣-第一旁瓣能量比。
Result indicates that the spectrum gained from using W-O way comprises much fewer side lobes and achieves higher energy ratio of main lobes to the first side lobe.
平面螺旋天线虽然具有频带宽、体积小、主瓣宽、易封装等特点，但是在具体应用中常常不能适应实际的需要。
Although the planar spiral antenna has characteristics of wide bandwidth, small volume, wide main beam and easy to be mounted, it still can not meet the needs of practice usages.
通过适当的幅度加权、降低激励信号的频率、调整阵元的间距等措施可以改变辐射声束的方向和辐射主瓣的角宽。
The direction of acoustic beam and angular width of main lobe can be changed by properly amplitude-weighting, decreasing the frequency of impulsive signal and adjusting the interval of array elements.
用加窗的DFT方法，从正弦波的DFT主瓣的幅度来计算正弦波的均方根值(RMS)，最好使用最小能量窗。
It's better to select the minimum energy window to calculate RMS of sine wave by using the window DFT on the basis of the amplitude of sine wave DFT main lobe.
数字相控阵雷达宽带宽角扫描存在波束指向偏差和孔径渡越问题，导致信噪比降低，脉压主瓣展宽，距离分辨率下降。
The wide-band digital array radar (WDAR), which accomplishes the transform between digital data and analog signal in the radar array, is the trend of the development of the phased array rader.
该方案用平滑的波形来替换前后码元的不连续跳变，从而得到相位连续的时域波形，波形平滑、频谱主瓣窄、滚降速度快。
This scheme uses smooth wave instead of discontinuous wave, so the wave in time field is continuous phase and has good frequency spectrum characteristics.
这种方法更有效地抑制了空间的非平稳和固定噪声比使用一个可旋转的主瓣中的2-D平面空的自适应的成形波束形成方法。
This method more effectively suppresses spatial nonstationary and stationary noise than the adaptive null-forming beamformer method by using a rotatable main lobe in the 2-D plane.
理论上实现了用较少的天线单元，且与小直径圆柱面共形的阵列，激励产生副瓣电平较低、主瓣有一定的宽度且顶部较平坦的波束。
Theoretically, a column conformal array with small size and few elements to generate a shaped beam with low side lobe and main beam with fixed width and flat top is carried out.
在提出日凌干扰处理新模型的基础上，根据太阳视面与天线主瓣半功率点截面的相对运动关系，系统阐述了日凌时天线噪声温度的分析方法。
A new model of dealing with solar radiating disturbance is put forward and a systematic explanation to the antenna noise temperature analysis in case of solar radiating disturbance is made.
分析了对星载SAR实施压制式干扰的可行性，通过计算压制式干扰功率，得出能够采用相干脉冲主瓣干扰对星载SAR实施压制干扰的结论。
The feasibility of blanket jamming against space-borne SAR is analyzed. Through calculating the power of blanket jamming, it is concluded that the coherent pulses can jam space-borne SAR.
计算实例说明提出的算法十分有效，获得了比已有文献更低的零深，并且可以在主瓣附近或旁瓣区生成零点，也可以在对称主瓣两侧方向生成零点。
Numerical results show the effectiveness of the proposed technique, the null depth levels obtained are lower than those reported in the literatures. Nulls are imposed both...
计算实例说明提出的算法十分有效，获得了比已有文献更低的零深，并且可以在主瓣附近或旁瓣区生成零点，也可以在对称主瓣两侧方向生成零点。
Numerical results show the effectiveness of the proposed technique, the null depth levels obtained are lower than those reported in the literatures. Nulls are imposed both...
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