多遥感卫星接收系统和其数据接收

该文叙述了单遥感卫星接收系统升级改造为多卫星接收系统所进行的研制工作。包括天线跟踪系统与高频信道的改造，卫星捕获软件的开发，中频接收解调设备的研制以及系统的总装调试等。     

多波束测深在海洋工程勘察中的应用

简述了多波束测深技术的基本原理，并结合几个典型的海上勘察工程实例，介绍了该技术在香港特别行政区海洋环境勘察环境、填海工程勘察等方面的应用成果以及工程勘察中的一些实践经验。     

天气雷达接收机传输特性参数S的动态测量方法

通常，天气雷达测量目标的反射率因子Z是依据对数接收机对稳定幅度的输入信号的传输特性参数，即斜率S和截距B，应用雷达气象方程估算得到的。由于接收机传输特性随时间容易发生变化，因此要经常对它定标。本文提出利用雷达视频信号处理器输出的各个距离库单元上的天气回波数字信号，实时地获取一组对数接收机传输特性曲线斜率的动态测值S，从而快速有效地估算其平均斜率S和相应截距B的新方法。并可利用这一技术随时检查接收机传输特性随时间变化的情况。以便及时更新S、B的值，保证反射率因子的估算精度。     

GPS接收机天线相位中心偏差的三维检定研究

根据GPS接收机天线相位中心的几何关系，在超短基线相对定位法的基础上，利用旋转天线，结合精密水准测量，给出了一种天线相位中心偏差三雏检验的方法。实例表明，该方法具有较高的精度和可靠性，适合于在野外对GPS接收机天线相位中心偏差进行实际检定。     

GPS接收机噪声对天线相位中心检测的影响分析

利用四天的零基线观测数据，截取不同时间长度的数据段，解算出北方向、东方向、高程方向的偏差量△N、△E、△U，对这些偏差量进行统计分析和误差分析。     

The crustal structure of Norway from inversion of teleseismic receiver functions

Teleseismic body waves from seismic broadband and short periodstations were used to investigate the crustal structure of Norwaythrough inversion of the receiver functions. The Moho depths ofthe Baltic Shield are quite well known from previous studiesincluding seismic experiments and spectral ratio technique.However, the results on the details of the crustal structure areinconsistent. This study provided more detailed crustalstructure information at 16 locations than previously known andgenerally confirmed Moho depth results obtained in earlier studies. Significant differences are seen at a few sites. The Moho for the various sites was found at depths between28 and 44 km. In summary, the crustal thicknessincreases from the West Coast of Norway, away from thecontinental margin, towards the centre of the Baltic Shield andfrom Southwest to the Northeast. This corresponds to theincreasing age of the crust. The P velocities in the crust atmost sites show a gradual increase from about 6.0 to 7.1 km/s, withoutclear layering.     

The velocity structure of crust and uppermantle in the Wudalianchi volcano area in—ferred from the receiver function

The Wudalianchi volcano is a modern volcano erupted since the Holocene.Its frequent occurrence of the small earthquake is considered to be indicator of active dormancy volcano.The S wave velocity structure is inferred from the receiver function for the crust and upper mantle of the Wudalianchi volcano area.The results show that the low velocity structure of Swave is widely distributed undemeath the volcano area and part of the low-velocity-zone located at shallow depth in the Wudalianchi volcano area.The low velocity structure is related to the seismicity.The Moho interface is not clear undemeath the volcano area,which may be regard to be an nec-essary condition for the lava upwelling.Therefore,we infer that the Wudalianchi volcano has the deep structural condition for the volcano activity and may be alive again.     

Receiver function estimated by maximum entropy deconvolution

Maximum entropy deconvolution is presented to estimate receiver function, with the maximum entropy as the rule to determine auto-correlation and cross-correlation functions. The Toeplitz equation and Levinson algorithm are used to calculate the iterative formula of error-predicting filter, and receiver function is then estimated. During extrapolation, reflective coefficient is always less than I, which keeps maximum entropy deconvolution stable. The maximum entropy of the data outside window increases the resolution of receiver function. Both synthetic and real seismograms show that maximum entropy deconvolution is an effective method to measure receiver function in time-domain.