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SAW器件能在较宽频率范围内高速工作,因而,近年来人们希望将其用作以扩频通讯为主的信号处理器件.本文在理论和实验方面研究了采用因频带能量集中性优良而引人注目的最小移频键控(MSK)调制方式的MSK匹配滤波器的构成法及特性,此器件应用了SAW抽头延迟线.给出了电极图形的形成法,说明了其脉冲响应、频率响应和相关特性,并依据实验结果及其模拟,介绍了通过调整抽头间隔来改善因SAW传播速度不均匀所导致的振幅畸变的方法.这种器件的一个较大的优点是:尽管结构简单,但是,仅用一个器件便可对MSK扩频调制和相关检波等进行信号处理,因此,可简化通讯系统的结构.作为其应用一例,我们试制了用这种器件进行扩频调制、并通过相关检波进行解调的系统,表明了由于结构简单故可用于扩频通讯这一事实,并确认了此器件的实用性.
SAW devices can work at high speed over a wide frequency range, and therefore, they are expected to be used as signal processing devices based on spread spectrum communications in recent years.In this paper, we study the theoretical and experimental aspects of using signal energy bands Attention is paid to the construction method and characteristics of an MSK matched filter with minimum frequency shift keying (MSK) modulation. The device uses a SAW tap delay line, and a method for forming the electrode pattern is given, and its impulse response, frequency response And related characteristics, and based on experimental results and simulations, a method of improving the amplitude distortion caused by the non-uniform propagation speed of SAW by adjusting the tap intervals is introduced. One of the great advantages of such a device is that although the structure is simple, , Only a single device can MSK spread spectrum modulation and related detection and other signal processing, thus simplifying the communication system structure.As an example of its application, we tried to use this device to spread spectrum modulation, and through the relevant detection The demodulated system shows the fact that it can be used for spread spectrum communication due to its simple structure and confirms the practicality of this device.