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三阶环有许多优点,最主要的优点之一是跟踪能力强。它以有限的误差跟踪频率加速度((?)),VCO的频率漂移几乎不会引入误差,只要跟踪范围够,就不必采取恒温措施。在二阶环锁相接收机中,常碰到随机误差和跟踪误差的矛盾,要减小输入噪声引起的随机误差,就要减小噪声带宽,但跟踪误差却增大了。有多种方法来解决这个矛盾。比
Third-order loop has many advantages, one of the most important advantages of tracking ability. It tracks the frequency acceleration with a finite error ((?)), VCO frequency drift almost no error, as long as the tracking range is enough, there is no need to take constant temperature measures. In the second-order loop-locked phase receiver, often encounter the random error and tracking error of the contradiction, to reduce the random noise caused by the input noise, it is necessary to reduce the noise bandwidth, but the tracking error has increased. There are many ways to solve this contradiction. ratio