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基于线性调频变换算法的SAW富氏谱分析技术是现代雷达、通讯、电子对抗及射电天文等领域的新一代支持技术之一。其中测频是其最基本功能。由于所用SAW色散延迟线基底材料延时温度系数的影响,所测频率通常随工作温度变化。故实用中正确认识测频随温度变化规律,是系统正确设计与补偿的前提。迄今据作者所知尚无令人满意的定量分析理论。本文由时间比例关系出发,定量分析了此类技术中基础结构的M-C型功率谱仪测频温度特性。给出相对不同频率分量的延时随温度变化的解析表达式。指出这种变化不仅与器件参数及基片延时温度系数有关,且与工作频率有关。应用本文结果还可合理地解释法国Thomson CSF公司的Claude Lardat有关实验中理论与实验的偏差。
The SAW Czochralski analysis technique based on the chirp algorithm is one of the next generation of support technologies in the fields of modern radar, communications, electronic warfare and radio astronomy. Frequency measurement is one of its most basic functions. Due to the delay temperature coefficient of the SAW dispersion delay line base material used, the frequency measured generally varies with operating temperature. Therefore, it is a prerequisite for the correct design and compensation of the system to correctly understand the law of frequency variation with temperature in practice. So far as the author knows there is no satisfactory theory of quantitative analysis. Based on the time-proportional relationship, this paper quantitatively analyzes the frequency-temperature characteristics of the M-C power spectrometer with the basic structure in such technologies. The analytical expression of the delay variation with temperature of different frequency components is given. Pointed out that this change is not only related to the device parameters and the substrate temperature coefficient of delay, and the operating frequency. The results of this paper can also reasonably explain Claude Lardat’s Thompson-CSF theory-experiment deviations in experiments.