一次雷达 meaning in English

primary radar

A short range psr is installed at sha chau to detect aircraft operating within the approach and departure areas of the hkia . secondary surveillance radar ( ssr )
一台短程的一次雷达已安装于沙洲，用以探测机场进场及离场范围内的飞机。
A radar data extractor is a piece of equipment that transforms video outputs of primary radar or secondary radar into digital tracking information of high quality
这是一种把一次雷达和二次雷达的视频输出变换成高质量、数字式目标航迹信息的雷达数据录取设备。
A single correction method is provided , that is , based on the height finding value of the primary radar and the height finding value of the secondary radar , the paper calculates the adjustment quantity of the antenna beam direction , micro - adjusts the arrary of antenna , and so that it improves the accuracy of height finding
并提出了一种简单易行的修正方法，即根据一次雷达的测高值和二次雷达的测高值计算出天线波束指向的调整量，对天线阵面波束指向进行微调，从而提高了测高精度。