| 生命探测系统中频信号的采样准则和频谱特性 |
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| 引用本文： | 邱力军,董秀珍,王健琪,王海滨,杨国胜,荆西京. 生命探测系统中频信号的采样准则和频谱特性[J]. 医学争鸣, 2003, 24(2): 169-171 |
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| 作者姓名： | 邱力军 董秀珍 王健琪 王海滨 杨国胜 荆西京 |
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| 作者单位： | 第四军医大学生物医学工程系计算机教研室,陕西,西安,710033 |
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| 基金项目： | 第四军医大学校创新工程资助项目 (CX99F0 1 0 ) |
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| 摘 要： | 目的：研究生命探测系统的距离分辨能力。方法：通过给出接收回波信号的距离谱表达式，采用近似方法建立频谱展宽与距离分辨力之间的关系，来得到它们关系的近似公式。结果：分析了其中频信号离散频谱现象和需要限制可分辨最大作用距离的特性，给出生命探测系统的中涉信号采样所需遵循的准则。结论：为生命探测系统采用的检测方法提供了理论依据。
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| 关 键 词： | 生命探测系统 中频信号 采样准则 频谱特性 |
| 文章编号： | 1000-2790(2003)02-0169-03 |
| 修稿时间： | 2002-09-27 |
Sampling criteria and spectrum features of the IF signal on life from detection systems |
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| Abstract: | AIM: To study the range precision and range r esolution of the life detection system.METHODS: From the discus sion of the range spectrum of target echoes and the relationship between the spe ctrum spread phenomena and range resolution, a simple, practical and approximate formula is obtained. RESULTS: By analysing the spectrum leakage phenomena that exist in its discrete spectrum and the features of the maximum d istinguishable range that should be limited, the sampling criteria of the interm ediate frequency signal in the life detection system is derived.CONCLUSI ON: The study con pride a theoretical basis for the detection methods of the life system. |
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| Keywords: | Vital Signals LFMCW Sampling Spectrum |
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