In the B-mode sector scan ultrasonic imaging system, the raw image is in polar coordinates, therefore, it is main tasks of image pre-processing to achieve image coordinate transform and interpolation.
在B型超声机械扇形扫描成像当中，原始图像信号是以极坐标的形式输出的，对图像进行实时坐标变换和漏点插补是图像预处理所要解决的主要问题。
The steady rotating speed control is achieved by phase-compensation in sector scan.
在扇形扫描中，马达稳速的控制是通过相位补偿实现的。
The measurement of antenna motion parameters, such as antenna sector scan Angle, sector scan speed, circle scan speed etc.
天线运动参数如天线扇扫范围、天线扇扫速度、天线环扫速度等参数的测量通常采用手动计时器测量。
Then a hierarchical scan algorithm is proposed to identify the sector PN code, which reduces search time greatly.
其次，提出分层搜索的扇区标识值识别算法，该算法能大大减少检测和识别时间。
Then a hierarchical scan algorithm is proposed to identify the sector PN code, which reduces search time greatly.
其次，提出分层搜索的扇区标识值识别算法，该算法能大大减少检测和识别时间。
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