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一、引言作为自动控制系统的锁相技术,由于它具有许多重要特性,例如跟踪特性、窄带特性、噪声特性、相位平坦特性以及锁定后无剩余频差和极少相位差等等。因而,从四十年代初才发展起来的这门新技术,目前已渗透到通信、雷达、遥测、导航、自动控制和自适应系统的各个领域之中,并广泛地应用在窄带跟踪滤波器、频率合成器、调相信号检波器及锁相应答器等方面。可以说:锁相技术,是现代科学必不可少的,发展最迅速的一门技术。
I. INTRODUCTION As the phase-locked technology of the automatic control system, it has many important characteristics, such as tracking characteristics, narrowband characteristics, noise characteristics, phase flatness characteristics and no residual frequency difference and very little phase difference after locking. Therefore, the new technology developed from the early 1940s has now penetrated into all fields of communications, radar, telemetry, navigation, automatic control and adaptive systems and is widely used in narrowband tracking filters, Frequency synthesizer, phase modulation signal detector and lock-transponder and so on. It can be said: phase-locked technology, is an indispensable modern science, the fastest growing technology.