CN101629998B - A holistic test apparatus multipath gps - Google Patents

A holistic test apparatus multipath gps Download PDF

Info

Publication number
CN101629998B
CN101629998B CN 200910011328 CN200910011328A CN101629998B CN 101629998 B CN101629998 B CN 101629998B CN 200910011328 CN200910011328 CN 200910011328 CN 200910011328 A CN200910011328 A CN 200910011328A CN 101629998 B CN101629998 B CN 101629998B
Authority
CN
Grant status
Grant
Patent type
Prior art keywords
plate
support
connected
gps
antenna
Prior art date
Application number
CN 200910011328
Other languages
Chinese (zh)
Other versions
CN101629998A (en )
Inventor
伊廷华
李宏男
Original Assignee
大连理工大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Abstract

一种全方位GPS多路径信号测试装置,主要由夹具、挂环、形状记忆合金绞线、反射板、反射板固定条、滚轴、扣紧装置、转轮、反射板支撑杆、连接法兰、伸缩杆、轨道、GPS接收机天线、抑径板和天线支撑组成。 A holistic GPS multipath signal test apparatus mainly by the clamp, hanging ring, a shape memory alloy wire, the reflecting plate, the reflecting plate fixing strip, roller, fastening means, the wheel, a reflecting plate support rods, connecting flange , telescopic rod, track, GPS receiver antenna, the antenna has a ground plane and support components. 其特征在于:轨道一端连接的GPS接收机天线支撑的上端连接有抑径板和接收机天线;轨道的另一端连接的伸缩杆上端安有法兰,法兰上端连接的反射板支撑杆的下部装有转轮,上端挂环和转轮中间通过形状记忆合金绞线相连;转轮上部处的反射板支撑杆断开处安有一个扣紧装置和滚轴,断开部位的上面装有反射板固定条。 Characterized in that: an upper end connected to a GPS receiver antenna track support is connected to the antenna and the receiver has a ground plane; Ann telescopic rod end of the other end of the track is connected to a flange, a lower flange connected to the upper end of the reflecting plate support rods with runner, the runner and an upper end connected to the middle ring linked through the shape memory alloy wire; a reflective plate at the upper portion support bar turning OFF the safety device has a fastening rollers and are mounted the reflection off position plate strap. 本发明的效果和益处是在反射板的大小可以调节、高度可以控制、与GPS天线的距离可以控制、与GPS天线的相对方位可以控制。 Effects and benefits of the present invention can be adjusted in the size of the reflection plate, the height can be controlled, the distance from the GPS antenna can be controlled, the relative orientation of the GPS antenna can be controlled.

Description

一种全方位GPS多路径信号测试装置 A holistic GPS multipath signal test apparatus

技术领域 FIELD

[0001] 本发明属于土木工程及测量工程技术领域,涉及一种全方位GPS多路径信号测试 [0001] The present invention belongs to the technical field of civil engineering and measurement engineering, to a full GPS multipath signal test

直ο Straight ο

背景技术 Background technique

[0002] 近年来,随着GPS中的载波相对定位技术逐步成熟,这一有着高效、快速、全自动、 全天候和高精度等优越性能的变形监测方法在特大型土木工程中开始应用。 [0002] In recent years, along with the relative positioning of the carrier in the GPS technology matures, with the efficient, rapid, automatic deformation monitoring method, and high-precision clock starts superior performance in large civil engineering applications. 通过GPS变形监测可以获取测点大量的重复观测数据,这些数据信息不但包含建筑物真实的变形量, 同时也不可避免地含有多种干扰误差项,如与GPS卫星有关的误差:卫星轨道偏差、卫星钟差;与卫星信号传播有关的误差:电离层折射、对流层折射、多路径效应;与接收设备有关的误差:观测误差、接收机钟差、天线相位中心偏差;其它误差:地球自转的影响、相对论效应影响、地球潮汐影响等。 GPS can be obtained by monitoring the deformation of a large number of measuring points repeated measures data, which contain information not only true deformation amount of the building, and also inevitably contain more interfering error term as an error associated with the GPS satellites: Satellite orbit deviation, satellite clock error; satellite signal propagation of error associated: ionospheric refraction, tropospheric refraction, multi-path effects; associated with the receiving device error: observation error, the receiver clock error, the antenna phase center deviation; other errors: influence of the earth's rotation the impact relativistic effects, such as the Earth's tides.

[0003] 这些误差源中,地球自转影响、地球潮汐影响等误差经模型化改正后,剩余残差对短基线的影响可以忽略。 After [0003] The sources of these errors, influence the Earth's rotation, by the earth tides and other modeled error correction, the influence of short baseline residuals can be ignored. 载波相对定位方式属于双差相位观测模型,根据基线两端的相关性原理,可完全消除相对论效应、卫星钟差和接收机钟差的影响,且对大气折射和卫星轨道误差也有很好地削弱作用。 Carrier relatively positioned double difference phase observation model belongs, according to the principle of correlation across the baseline, can be completely eliminated relativistic effects, the difference between the satellite clock and the receiver clock error effects, and on the satellite orbit errors and atmospheric refraction also have good effect weakens . 而多路径效应引起的误差,随着反射物距离的增加衰减很快,使得多路径效应的测站相关性很弱,即使很短的基线,两站间多路径影响差异也很大,站间求差方法对多路径误差的消除作用不大,且没有较好的模型来改正,多路径效应已成为影响高精度定位的最大制约因素。 And the error due to multipath effects, attenuation increases as the distance reflector quickly, so that the station weak correlation multipath effect, even if very short baseline between two stations is also a great difference in the influence of multipath, an inter-station differencing method for eliminating multipath error not very useful, and there is no better model to correct the multipath effect has become the biggest limiting factors for high-precision positioning.

[0004] 采用GPS对结构进行监测时,每个GPS天线安装的位置是不同的,它们所处的环境也就不同,不同环境的反射介质将引起的不同的多路径误差,因此研究并归纳出常见介质对GPS信号的影响规律具有重要的现实意义。 [0004] The structure of the GPS time monitoring, each installation position of the GPS antenna are different, their environment is different, reflecting the different media of different multipath error due to the environment, and therefore study concludes common media has important practical significance to the influence of the GPS signal. 但目前国内外学者对GPS信号的影响规律的实验研究基本处于探索阶段,大多是将反射板简单的摆放在GPS天线的旁边或通过三脚架将反射板挂起来的方式来产生多路径信号,这样做有众多缺陷:(1)反射板的高度较难精确控制;(2)反射板与GPS天线的距离较难精确控制;(3)反射板与GPS天线的相对方位较难精确控制;(4)不同大小的反射板较难牢固的固定住。 But the experimental study of the influence of domestic and foreign scholars on the basic GPS signals at the exploratory stage, mostly reflecting plate placed next to a simple GPS antenna or multipath signals to produce a tripod by the reflector plate hang up the way so do have many drawbacks: the height (1) is difficult to accurately control the reflection plate; (2) from the reflecting plate and the GPS antenna is difficult to control precisely; (3) the relative orientation of the reflecting plate and the GPS antenna is difficult to control precisely; (4 ) of different sizes reflector difficult to firmly fixed.

[0005] 因此,开发一种全方位的GPS多路径信号测试装置对土木工程及测量工程技术领域的工作人员研究GPS多路径信号的规律性,进而提高GPS定位精度具有重要的现实意义。 [0005] Therefore, the development of a full range of GPS multipath signal test device of staff in technical areas of civil engineering and engineering studies measuring the regularity of GPS multipath signal, thereby improving the accuracy of GPS positioning has important practical significance.

发明内容 SUMMARY

[0006] 本发明提供了一种全方位GPS多路径信号测试装置,其目的是解决GPS多路径误差实验中反射板的高度、反射板与GPS天线的距离、反射板与GPS天线的相对方位较难精确控制等问题。 [0006] The present invention provides a full range of GPS multipath signal test apparatus, which aims to solve the height of the GPS multipath error experiments reflecting plate, the reflecting plate and the relative orientation from the GPS antenna, the GPS antenna reflector plate than difficult to precisely control and other issues.

[0007] 本发明的技术方案如下: [0007] aspect of the present invention is as follows:

[0008] 全方位GPS多路径信号测试装置,主要由夹具、挂环、反射板上固定条、反射板上固定条螺栓、形状记忆合金绞线、反射板、反射板下固定条、反射板下固定条螺栓、滚轴、扣 [0008] full GPS multipath signal test apparatus mainly by the clamp, the fixing strip, the hanging ring reflector plate, the reflection plate fixing strip, secured on the reflector strips bolt, a shape memory alloy wire, the reflecting plate, the reflecting plate Article fixing bolt, roller, deduction

3紧装置、转轮、转轮把手、反射板支撑杆、反射板支撑杆螺栓、连接法兰、伸缩杆、伸缩杆支座、伸缩杆支座螺栓、轨道、GPS信号接收机天线、抑径板、GPS信号接收机天线支撑、GPS信号接收机天线支座螺栓和GPS信号接收机天线支座组成。 Gripping means 3, pulley, wheel handle, the support rod reflection plate, a reflection plate support bar bolts, flanges, telescopic rod, the telescopic support rod, telescopic rod bearing bolts, orbits, GPS signal receiver antennas, suppressing diameter board, GPS signal receiver support antenna, GPS signal receiver and the GPS signal antenna mount bolt receiver antenna pedestals. 主要技术方案为:将轨道固定在地面上,轨道的一端连接GPS信号接收机天线支座,支座的上端连接GPS信号接收机天线支撑,支撑上端连接抑径板,抑径板上面安装GPS信号接收机天线;轨道的另外一端连接伸缩杆的支座,支座的上端连接伸缩杆,伸缩杆上端连接法兰,法兰上端通过螺栓与反射板支撑杆连接;反射板支撑杆的下部对称装有两个转轮,上端对应位置处焊接两个挂环,挂环和转轮中间通过形状记忆合金绞线相连接;在两个转轮上部处的反射板支撑杆断开,断开位置处安装一个扣紧装置和滚轴;反射板支撑杆断开部位的上面安装有反射板下固定条和上固定条,下固定条与支撑杆焊接,上固定条通过夹具与支撑杆连接,上固定条和下固定条上均勻分布有螺栓孔。 The main technical scheme: a rail fixed on the ground, one end of the rail is connected to the antenna support GPS signal receiver, connected to the upper end of bearing support GPS signal receiver antenna, connected to the upper end of the support path suppressing plate mounted above the GPS signal has a ground plane receiver antenna; connecting the other end of the rail seat telescopic rod, the upper end of the telescopic connecting rod bearings, the telescopic rod end connector flange, an upper flange by bolts to the support rods reflection plate; a lower plate support rods symmetrically mounted reflector there are two runner, two upper hanging ring corresponding to the welding position, the hanging ring and the intermediate wheel are connected by a shape memory alloy wire; disconnected reflective plate two supporting rods at an upper portion of the wheel, at off position and a fastening means mounting the roller; a fixed plate and a reflective strip at the upper reflecting plate fixed bar support bar broken portion, the lower fixing strip support bar welded, fixed by a clamp of connection to the support bar, fixed evenly distributed on the fixing bolt hole and the Articles.

[0009] 通过松开反射板支撑杆上的扣紧装置,可以使反射板改变仰俯角;通过调整伸缩杆的长短,可以改变反射板的高度;通过调整伸缩杆支座螺栓可以改变反射板与GPS信号接收机天线之间的距离;通过调整反射板支撑杆螺栓可以改变反射板与GPS信号接收机天线之间的方位;通过调整夹具在反射板支撑上的位置可以使装置适用于不同大小的反射板。 [0009] By loosening the fastening means on the reflector plate support rods, you can change the pitch angle of the reflecting plate; by adjusting the length of the telescopic rod, can change the height of the reflective plate; a reflective plate may be varied by adjusting the telescopic rod bearing bolts the distance between the GPS receiver antenna signal; orientation can be changed between the reflective plate and the GPS signal receiver plate support rod antenna reflector by adjusting screws; jig by adjusting the position of the support on the reflector plate can be made suitable for different sizes of device Reflective plate. 此外,形状记忆合金绞线可以有效控制反射板的牢固性,抑径板可以有效消除来自GPS 信号接收机天线下部的多路径信号。 In addition, the shape memory alloy wire can effectively control the firmness of the reflection plate, has a ground plane multipath signals can effectively eliminate the lower portion of the signal from the GPS receiver antenna.

[0010] 本发明的效果和益处体现在反射板的高度可以精确控制、反射板与GPS天线的距离可以精确控制、反射板与GPS天线的相对方位可以精确控制、发射板的大小可以调节、发射板的材料可以自由更换。 [0010] Advantages and benefits of the present invention is embodied in highly reflective plate can be accurately controlled, distance to the reflecting plate and the GPS antenna can be precisely controlled, the relative orientation of the reflecting plate and the GPS antenna can be precisely controlled, the size of the radiation plate can be adjusted, emission material sheet may be freely replaced. 该装置为工程技术人员研究GPS多路径信号的规律性,进而提高GPS定位精度提供了一个有力的工具。 Study on the regularity of the device multipath signals of GPS for engineering and technical personnel, and to improve the accuracy of GPS positioning provides a powerful tool.

附图说明 BRIEF DESCRIPTION

[0011] 图1是全方位GPS多路径信号测试装置的侧立面图。 [0011] FIG. 1 is a side elevational view of a full GPS multipath signal test device.

[0012] 图2是图1中全方位GPS多路径信号测试装置的AA剖面图。 [0012] FIG. 2 is an AA sectional view of the GPS multipath signal a full test device.

[0013] 图3是图1中全方位GPS多路径信号测试装置的BB剖面图。 [0013] FIG. 3 is a sectional view BB of the GPS multipath signal a full test device.

[0014] 图4是全方位GPS多路径信号测试装置中反射板的仰俯示意图。 [0014] FIG. 4 is a schematic view of a full range of pitch GPS multipath signal testing means reflecting plate.

[0015] 图5是全方位GPS多路径信号测试装置中反射板的升降示意图。 [0015] FIG. 5 is a schematic elevation full GPS signal multipath reflection plate test device.

[0016] 图6是全方位GPS多路径信号测试装置中反射板的前后移动示意图。 [0016] FIG. 6 is a schematic view of a mobile GPS multipath signals before and after the full-testing means reflecting plate.

[0017] 图7是全方位GPS多路径信号测试装置中反射板的转动示意图。 [0017] FIG. 7 is a schematic view of a full range rotation GPS signal multipath reflection plate test device.

[0018] 图8是全方位GPS多路径信号测试装置中反射板的大小调整示意图。 [0018] FIG. 8 is a full size adjustment GPS signal multipath reflection plate test device FIG.

[0019] 图中:1.夹具;2.挂环;3.反射板上固定条;4.反射板上固定条螺栓;5.形状记忆合金绞线;6.反射板;7.反射板下固定条;8.反射板下固定条螺栓;9.滚轴;10.扣紧装置;11.转轮;12.转轮把手;13.反射板支撑杆;14.反射板支撑杆螺栓;15.连接法兰; 16.伸缩杆;17.伸缩杆支座;18.伸缩杆支座螺栓;19.轨道;20. GPS信号接收机天线; 21.抑径板;22. GPS信号接收机天线支撑;23. GPS信号接收机天线支座螺栓;24. GPS信号接收机天线支座。 [0019] FIG: 1 clamp; 2 hanging ring; reflection plate 3 fixed bar; Article bolt fixing the reflecting plate 4; 5 a shape memory alloy wire; reflection plate 6; 7 reflection plate...... fixed bar; 8 lower reflection plate fixing bolts that; 9 roller;. fastening means 10; 11 runner; 12 turning the handle;. reflector plate support bar 13; 14 reflector plate support bar bolt; 15 The connecting flange; 16. telescopic rod;. telescoping rod holder 17; 18 telescopic rod bearing bolts;.. 19 track;. 20 GPS signal receiver antenna; plate 21. The diameter of inhibition;. 22 GPS signal receiver antenna a support;. 23 GPS signal receiver antenna mount bolt;. 24 GPS receiver antenna carrier signal.

具体实施方式[0020] 以下结合技术方案和附图详细叙述本发明的实施步骤。 DETAILED DESCRIPTION [0020] The following embodiments in conjunction with the accompanying drawings and the technical solutions of the present invention, the steps described in detail.

[0021] 步骤1.通过分析空中GPS卫星的分布规律及进行多路径实验所处的位置,确定多路径信号测试装置的尺寸及参数。 [0021] Step 1. By analyzing the distribution of the air and the GPS satellite position in which the multi-path test, and parameters determining the size of multipath signal test device.

[0022] 步骤2.将轨道19固定在地面上,轨道19的一端通过螺栓23连接GPS信号接收机天线支座M ;GPS信号接收机天线支撑22的下端连接支座对,上端连接抑径板21,抑径板21上面安装GPS信号接收机天线20。 [0022] Step 2. The rail 19 is fixed on the ground, one end of the rail 19 is connected to the GPS signal receiver antenna mount by a bolt 23 is M; GPS signal receiver antenna 22 is connected to the lower end of the support bearing on the upper end plate connected to suppressor diameter 21, 21 is mounted above the Ground plane antenna 20 GPS signal receiver.

[0023] 步骤3.轨道19的另外一端通过螺栓18连接伸缩杆支座17 ;伸缩杆16的下端连接支座17,上端连接法兰15,法兰15上端通过螺栓14与反射板支撑杆13连接。 The other end is connected by the bolts 18 support the telescopic rod 17 [0023] Step 3. The rail 19; the lower end of the telescopic rod 16 is connected to the support 17, the upper end of the connection flange 15, the upper end of the flange 15 by bolts 14 and the reflecting plate 13 supporting bar connection.

[0024] 步骤4.反射板支撑杆13的下部对称装有两个转轮11,上端对应位置处焊接两个挂环2,挂环2和转轮中间通过形状记忆合金绞线5相连接。 [0024] Step 4. The lower portion of the reflection plate support rod 13 provided with two symmetrically wheel 11, at a position corresponding to the welding of two upper hanging ring 2, the intermediate ring 2 and the wheel hanging wire 5 are connected by a shape memory alloy.

[0025] 步骤5.在两个转轮11上部反射板支撑杆13断开,断开位置处安装一个扣紧装置10和滚轴9。 [0025] Step 5.13 disconnect the upper reflector plate 11 two wheel supporting rod, mounted at the open position and the roller 10 a fastening means 9.

[0026] 步骤6.反射板支撑杆13断开部位的上面安装有反射板下固定条7和上固定条3 ; 下固定条7与支撑杆13焊接,上固定条3通过夹具1与支撑杆13连接;上固定条和下固定条上均勻分布有螺栓孔。 [0026] Step 6. The above reflecting plate support bar 13 is attached to fixed parts of the disconnection strip 7 and strip 3 is fixed on the reflection plate; strip 7 fixed support bar 13 is welded, the strip 3 is fixed by a jig with a support rod 13 is connected; bolt holes uniformly distributed on the fixed bar and the fixed bar.

Claims (1)

  1. 1. 一种全方位GPS多路径信号测试装置,由夹具(1)、挂环O)、反射板上固定条(3)、 反射板上固定条螺栓G)、形状记忆合金绞线(5)、反射板(6)、反射板下固定条(7)、反射板下固定条螺栓(8)、滚轴(9)、扣紧装置(10)、转轮(11)、转轮把手(12)、反射板支撑杆(13)、反射板支撑杆螺栓(14)、连接法兰(15)、伸缩杆(16)、伸缩杆支座(17)、伸缩杆支座螺栓(18)、轨道(19)、GPS信号接收机天线00)、抑径板、GPS信号接收机天线支撑(22)、GPS信号接收机天线支座螺栓、GPS信号接收机天线支座04)组成;其特征在于:固定在地面上轨道(19)的一端连接GPS信号接收机天线支座(M),GPS信号接收机天线支座04)的上端连接GPS信号接收机天线支撑(22),支撑0¾上端连接抑径板(21),抑径板上面安装GPS信号接收机天线00);轨道(19)的另外一端连接伸缩杆支座(17), 伸缩杆支座 A full GPS multipath signal test apparatus by the clamp (1), hanging ring O), fixed on the reflector strips (3), the reflector plate fixing bolt bar G), the shape memory alloy wire (5) reflecting plate (6), reflecting the lower plate of the holding bar (7), screw fixing strip (8) for a reflecting plate, a roller (9), fastening means (10), the wheel (11), turning the handle (12 ), a reflecting plate support bars (13), a reflecting plate support bar bolt (14), connection flange (15), telescopic rod (16), the telescopic rod support (17), the telescopic rod bearing bolts (18), the rail (. 19), GPS signal receiver antenna 00), has a ground plane, GPS signal receiver antenna support (22 is), GPS signal receiver antenna mount bolt, GPS signal receiver antenna support 04) composition; characterized in that: One end of the upper end of the fixed rail (19) on the ground of the GPS signal receiver connected to the antenna support (M), the GPS signal receiver antenna support 04) is connected to GPS signal receiver antenna support (22), connected to the upper end of the support 0¾ suppressing plate diameter (21), has a ground plane antenna installed above the GPS signal receiver 00); the other end of the track (19) is connected to the telescopic rod support (17), the telescopic rod bearing 17)的上端连接伸缩杆(16),伸缩杆(16)上端连接连接法兰(15),连接法兰(15)上端通过伸缩杆支座螺栓(18)与反射板支撑杆(13)连接;反射板支撑杆(13)的下部对称装有两个转轮(11),上端对应位置处焊接两个挂环,挂环(¾和转轮(11)中间通过形状记忆合金绞线(5)相连接;在两个转轮(11)上部处的反射板支撑杆(13)断开,断开位置处安装一个扣紧装置(10)和滚轴(9);反射板支撑杆(13)断开部位的上面安装有反射板下固定条(7)和反射板上固定条(3),反射板下固定条(7)与反射板支撑杆(13)焊接,反射板上固定条⑶通过夹具⑴与反射板支撑杆(13)连接,反射板上固定条(3)和反射板下固定条(7)上均勻分布有螺栓孔。 The upper end of 17) connected to the telescopic rod (16), the telescopic rod (16) an upper connection flange (15), connection flange (15) connected by an upper end of the telescopic rod bearing bolts (18) and the reflecting plate support bars (13) ; lower reflective plate support bars (13) with two symmetrical wheel (11), an upper welding at positions corresponding to two hanging ring, hanging ring (¾ and the runner (11) by a shape memory alloy wire intermediate (5 ) is connected; (11) at the upper portion of the reflecting plate support bars (13) two wheel disconnected, mounting an open position at a fastening device (10) and roller (9); a reflective plate support bars (13 ) above the broken portion is attached to a fixed bar (7) and the reflection plate is fixed on the reflector strips (3), the lower plate is fixed reflector strip (7) and the reflecting plate support bars (13) are welded, the reflection plate holding bar ⑶ (13) is connected by a clamp support bar ⑴ reflective plate, bolt holes are uniformly distributed on the fixed bar (7) (3) and reflected by the reflector plate strap.
CN 200910011328 2009-04-25 2009-04-25 A holistic test apparatus multipath gps CN101629998B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200910011328 CN101629998B (en) 2009-04-25 2009-04-25 A holistic test apparatus multipath gps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200910011328 CN101629998B (en) 2009-04-25 2009-04-25 A holistic test apparatus multipath gps

Publications (2)

Publication Number Publication Date
CN101629998A true CN101629998A (en) 2010-01-20
CN101629998B true CN101629998B (en) 2012-02-22

Family

ID=41575174

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200910011328 CN101629998B (en) 2009-04-25 2009-04-25 A holistic test apparatus multipath gps

Country Status (1)

Country Link
CN (1) CN101629998B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6753812B2 (en) 2001-02-02 2004-06-22 Rosum Corporation Time-gated delay lock loop tracking of digital television signals
US6900758B1 (en) 2001-10-17 2005-05-31 Sirf Technology, Inc. System, method, apparatus and means for constructing building tomography and timing information
WO2006132003A1 (en) 2005-06-06 2006-12-14 National University Corporation Tokyo University Of Marine Science And Technology Gps reception device and gps positioning correction method
CN100588292C (en) 2003-09-22 2010-02-03 美国联合包装服务有限公司 Co-existing system for testing electromagnetic signal covering near the transportation route
CN201417305Y (en) 2009-04-25 2010-03-03 大连理工大学 Omnibearing GPS multi-path signal testing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6753812B2 (en) 2001-02-02 2004-06-22 Rosum Corporation Time-gated delay lock loop tracking of digital television signals
US6900758B1 (en) 2001-10-17 2005-05-31 Sirf Technology, Inc. System, method, apparatus and means for constructing building tomography and timing information
CN100588292C (en) 2003-09-22 2010-02-03 美国联合包装服务有限公司 Co-existing system for testing electromagnetic signal covering near the transportation route
WO2006132003A1 (en) 2005-06-06 2006-12-14 National University Corporation Tokyo University Of Marine Science And Technology Gps reception device and gps positioning correction method
CN201417305Y (en) 2009-04-25 2010-03-03 大连理工大学 Omnibearing GPS multi-path signal testing device

Also Published As

Publication number Publication date Type
CN101629998A (en) 2010-01-20 application

Similar Documents

Publication Publication Date Title
CN2164117Y (en) Polar axle type mechanical drive and control device of paraboloid antenna
CN102145753A (en) Unstressed installation method for solar cell array driving mechanism
CN102145755A (en) Zero-gravity suspension type deployment test device
CN201149587Y (en) Fixed bearing with continuously adjustable clamping force for acoustic emission sensor
CN202074964U (en) Laser tunnel convergence monitoring system
CN201788169U (en) Special metal magnetic memory sensor clamp for detecting shaft micro-cracks
CN101294800A (en) Frame angle calibration method and apparatus of multi-frame optoelectronic platform
CN103806106A (en) Single crystal rod adhering device
CN102095350A (en) Method and device for detecting axiality of stator bracket of wind generator
CN202693082U (en) Liquid level detecting device special for flotation column
CN201277861Y (en) Equipment foundation built-in anchor bolt installation measurement control platform
CN201637484U (en) Fixture for testing vibration noise of car fan
CN103273105A (en) Mechanical arm drilling device
CN2526784Y (en) Dynamic state and static state measurer for axis of rotary kiln
Paquet et al. An application of cosmic-ray neutron measurements to the determination of the snow water equivalent
CN203375901U (en) Device for measuring steam seal, baffle plate and flow path of steam turbine
CN203909274U (en) Microwave enhancement reflection apparatus in three dimensional variable mode
CN201838720U (en) Device for receiving gain calibration of VSAT (very small aperture terminal) station antenna
CN203981572U (en) Track-based automatic multi-angle observation device
CN201828547U (en) Probe position adjusting device of ultrasonic surface defect detector
CN203277648U (en) Automatic matching device of Ku-band satellite communication portable station antenna
CN202255389U (en) Forced centering device for gyroscopic total station
CN102305624A (en) Method for calibrating compass
CN201425464Y (en) Special positioning device for excitation starting generator of internal-combustion locomotive
CN2875902Y (en) Multipurpose calibration instrument of infrared ray axle temperature detecting equipment

Legal Events

Date Code Title Description
C06 Publication
C10 Entry into substantive examination
C14 Grant of patent or utility model
EXPY Termination of patent right or utility model