关于数字相位式测距仪的频率改正

本文在分析自动脉冲数字测相基本原理的基础之上，推出了不仅与测距频率有关，而且还与填充脉冲频率及低频测相频率有关的新的频率改正公式，并给出新的频率改正公式与传统频率改正公式之间等同的条件，即有锁相环路（或频率跟踪电路）的正常工作来保证。     

高精度动态频率测量系统

本文介绍了一种高精度动态频率测量系统。它能以较高的采样频率，对一动态变化的频率进行自动测量，并将数据存盘。即使被测频率比较低，仍能取得很高的测量精度。     

日食舆電離層的關係

由於地磁的日變化,有人推想大氣高層有導電空氣層之存在。1895年波波夫教授發明無線電以後,1901年無線電信號越過大西洋成功,指出此導電層存在之想法並非虛構,我們稱這導電空氣層為電離層。經過很多人的研究,其中我國學者有不少的貢獻,現在電離層的秘密漸漸的揭開了。電離層的研究有各種不同的     

活动星系核与类星体中致密天体的形成与并合：伽玛爆发与引力辐射

频繁的超新星爆发可用以解释活动星系核与类星体的超高金属丰度。星团中的恒星与吸积盘相互作用导致致密天体中子星和黑洞的形成率很高,这些致密天体与红巨星很容易形成双星系统,而后形成（ＮＳ／ＢＨ,ＮＳ／ＢＨ） 双星由于引力辐射最终导致并合而形成伽玛射线爆发。我们估计了伽玛射线爆的爆发频率,发现与观测相符。     

无线信道中传输高速数据的试验报告

本文主要介绍了利用无线信道传输9600bps数据信号的的几种试验方案,并对其进行了评价,供各界参考。     

浅谈L波段测风雷达-GTS1型数字探空仪频率的调整

与701雷达—59型探空仪探测系统相比,L波段雷达—GTS1型数字探空仪探测系统对雷达频率的要求更为严格,频率调整是否合适,直接影响到雷达天线自动跟踪、距离自动跟踪和探测数据的接收。经过一段时间的使用,积累了一些雷达频率调整的经验。1放球前的频率调整GTS1型数字探空仪的载波中心频率f。为1675MHz±3MHz,即载波中心频率范围为1672￣1678MHz,通常以接近1675MHz为最好。在放球前需要调整雷达接收机的频率,使之与探空仪的载波中心频率最接近。调整雷达接收机频率的方法有两种:第一是增益控制按钮置于自动状态,然后手动调整频率,使监…     

沱沱河地区风的气候变化特征分析

根据沱沱河气象站1971年-2002年定时、逐日、月、年风向、风速资料,统计分析了该地区风的气候变化特征。研究表明:沱沱河地区年内最大风速出现在2月和11月,平均风速春季最大,秋季最小;全年盛行风向是偏西风;大风日数的年变化以2月份最大,7月最小;年平均风速是逐年减小趋势,其中冬季减少最为明显,大风日数总体上是逐年增多的特点,但自90年代以来表现出显著减少的趋势;风速频率分布呈双峰型,小于4m/s的风速在该地区出现的频率最多。     

磁异常数据处理方法的应用

文章以冀东一些铁矿区地面磁测成果为例,总结了磁异常转换、定量解释推断一些方法的应用及效果.     

Predicting the distribution of thin bed reservoirs by broad frequency band seismic

Recognition of thin interbedded reservoirs in the middle-shallow strata in the Songliao Basin is a great difficulty. In order to resolve this problem, we present a technique for predicting the distribution of thin reservoirs using a broad frequency band and ultra high resolution seismic. Based on forward modeling, we recognized that a thin bed seismic reflection is characterized by changing amplitude with changing frequency （amplitude versus frequency, AVF）. We calculate the thickness of thin reservoirs from their AVF characteristics and predict the distribution of thin bed reservoir using broad frequency band and ultra high resolution seismic. The technique has been applied in the 3D seismic area of Zhaoyuan in the northern part of the Songliao Basin. The seismic resolution is increased by two or three times over that of conventional seismic and many thin reservoirs have been identified. The technique has extensive application to the exploration and development of oil and gas, such as optimizing the location of exploration wells, the design of wells （especially horizontal wells）, choice of production test layers, analyzing reservoir continuity in development wells, and so on.     

Seismic identification of channel sandbodies in the Fuyang oil layer in North Songliao Basin, China

The Fuyang oil-layer in North Songliao Basin is characterized by thin interbedded sands and shales, strong lateral variation, strong reservoir heterogeniety, and so on. The thickness of individual sand layers is generally 3 - 5 m. Identifying the channel sand-bodies of the Fuyang oil layer using seismic techniques is very difficult due to the low seismic resolution. Taking the GTZ area as an example, we discuss the genetic characteristics of the channel sand-bodies and point out the real difficulty in using seismic techniques to predict the channel sand-bodies. Two methods for the identification of channels are presented： frequency spectrum imaging and pre-stack azimuthal anisotropy. Identifying the channel sand-bodies in Fuyu oil-layer using the two seismic methods results in a success rate up to 80% compared with well data.