一、前言在数字式平面位置录取显示器中,为保证录取精度(画面的配准精度),通常把天线方位角θ用数字控制逻辑的方式分解成正弦分量sinθ和余弦分量coseθ。这里我们采用了方位增量码盘与天线轴机械交连,要求在天线波束指向地理正北时产生一正北脉冲信号(称为N信号)。当天线每转过一个象限,能线性地输出1024(或2048)个方位增量脉冲信号(称为△θ信号)。由此可见,天线转一周即输出4096(或 I. INTRODUCTION In order to ensure the recording accuracy (the registration accuracy of the picture), the azimuth θ of the antenna is usually decomposed into the sine component sinθ and the cosine component coseθ by means of digital control logic in the digital plane position register. Here we use azimuth incremental codewheel mechanically linked to the antenna axis, requiring a positive north pulse signal (referred to as the N signal) when the antenna beam is pointing to a geographic positive north. As the antenna rotates by one quadrant, 1024 (or 2048) azimuth incremental pulse signals (called Δθ signals) can be linearly output. Thus, the antenna output 4096 revolutions a week (or