An Micro-Bandpasss (6.3≈7.6μm) Filter for the Multichannel Scanning Radiometer

Optical coatings are designed and produced for the multichannel scanning radiometer meteorological space instrument operating in the spectral range 6.37.6m. First the choice of substrates and layers materials is discussed. Then the substrate temperatures dependent effects of three different Te-enriched PbTe single layers on the dispersion and absorption characteristics and carrier concentration are studied. The experimental results demonstrate that the performance of the coating made using PbTe + 0.3 at. % Te material is better than that of the others. Finally, details of the spectral design and manufacture of such a filter which meets the demanding bandwidth and transparency requirements of the application are presented. This design model is based on the optical and semiconductor properties of a multilayer filter containing PbTe layer materials in combination with the dielectric dispersion of ZnSe deposited on the a Ge substrate. Comparisons between the computed spectral performance of the model and spectral measurements from manufactured coatings over a wavelength range of 6.37.6m are presented.     

被动毫米波制导下辐射特性控制的考虑

为提高地面目标在未来战场的生存能力,分析了被动毫米波探测与制导的作用原理与实际威胁,指出了目标的毫米波辐射特性控制的实际需要。在对毫米波辐射特性测量机理的深入分析,与辐射计探测距离公式的推导、讨论基础上,指出毫米波辐射特性控制的主要方向为目标的形状和材料特性的控制,并从这两方面分析了辐射特性控制的实际措施。     

周期定标毫米波辐射计的性能分析

辐射计的性能主要取决于灵敏度、准确度和稳定度.文中给出了周期定标辐射计灵敏度、准确度和长期稳定度的分析方法,并研制了周期定标毫米波辐射计.该辐射计采用直放式接收机体制,工作频率为33～38GHz,利用有源噪声源的开和关作为高温和低温定标源.实验结果表明:该毫米波辐射计稳定度可达1.28K,准确度为1.71K.当场景测量的积分时间与高、低温定标的积分时间都为7.7ms时,灵敏度优于0.50K.     

红外光谱辐射计的研制

介绍了红外光谱辐射计的组成及工作原理,分析了其信号处理方法。红外光谱辐射计的核心是分光元件、光学系统及信号处理部分。该设备采用容易调整的高像质反射光学系统和波长在２５～１４μｍ连续可变的分光系统,并采用高集成度、高精度的数据采集、数字锁相和数据处理、存储系统。观察瞄准、探测接收的光学系统以及数据采集、处理系统都被放到一个体积很小的测量头中,具有体积小、质量轻牢固可靠、抗干扰性能强和使用方便等优点。入瞳的最小可探测率为１０－１２Ｗ／ｃｍ２,光谱分辨率为２％,测量速度为１０条谱线／ｓ。经实际检测和使用,该设备的性能达到国内外先进水平,并具有野外工作的特点。     

Approach to Generate Radiometric Images

A new technique to generate radiometric images from the optical images is introduced in this paper. This technique can be applied in generating the source images for purpose of image-matching navigation. For comparison, two radiometric images are presents, one is imaged by a 8mm ground-based radiometer and the other is generated by this technique.     

3mm波段改进型全功率辐射计

本文分析了全功率计和Ｄｉｃｋｅ辐射计的优缺点，提出了改善全功率辐射计输出幅度存在漂移的方法，使全功率制式的３ｍｍ辐射计成功应用于１．２Ｍ射电望远镜上，取得了初步观测结果。特别指出，该制式在实现太阳射电的快速测量方面，具有系统电路简单，预期软件编制容易的优点。已经模拟实验证明，系统可实现小于毫秒量级的快速测量。     

高精度二维扫描控制系统的可靠性研究

多通道扫描成像辐射计是FY-4气象卫星上的主要载荷之一,其扫描镜的工作状况将直接影响到卫星所提供的气象云图。根据扫描控制系统的工作原理,分析了影响其可靠性的因素,并利用避错、容错技术来消除这些因素所造成的影响,以保证扫描镜的稳定工作。最后通过实验加以验证,达到了满意的效果。     

基于PSD的扫描辐射计通道配准测量方法研究

风云四号（FY-4）气象卫星正在进行预先研究,其扫描辐射计具有通道多、空间分辨率高、配准精度高等特点,通道配准难度较大.通道配准测量的结果是通道配准的重要参考依据.PSD（Position Sensitive Detector）是一种新型的横向光电效应器件,具有测量精度高、检测时不受入射光斑及焦点偏离的影响等特点,非常适合通道配准测量使用.基于PSD的扫描辐射计通道配准测量系统测量精度高,有效测量范围大,达到了扫描辐射计通道配准测量的要求.     

Research on Antenna Temperature Contrast of Metal Solid Objects

It is necessary to study the radiation characteristic of metal solid objects for millimeter wave passive guidance. On basis of discussing the grounded theory, the antenna temperature contrast formula of metal solid objects is presented. Furthermore equivalent radiometric section coefficient based on scale-shrinking measuring theory is proposed in favor of engineering applications. The data error between 8mm theoretical calculation and actual measurement are mostly below 1K. So equivalent radiometric section coefficient gives a virtual way for engineering calculation and measurement of metal solid objects.