IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences最新文献_第2页

Motion compensation for ASTOR long range SAR ASTOR远程SAR的运动补偿

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66178

John S. A. Hepburn, C. Doyle

{"title":"Motion compensation for ASTOR long range SAR","authors":"John S. A. Hepburn, C. Doyle","doi":"10.1109/PLANS.1990.66178","DOIUrl":"https://doi.org/10.1109/PLANS.1990.66178","url":null,"abstract":"The United Kingdom Ministry of Defence is conducting a long range synthetic aperture radar (SAR) technology demonstrator programme (TDP) in support of their airborne stand-off radar programme. A major goal is to develop a high-resolution airborne SAR with both strip map and spotlight modes. To attain the image quality objectives of the project, it is essential that very accurate motion compensation be applied to the radar returns to reduce image degradation, caused by spurious antenna phase center motion, to acceptable levels. The SAR motion compensation system (SARMC) includes a master inertial navigation system located near the center of mass of the host aircraft and a slaved strapdown inertial measurement unit mounted on the back of the radar antenna, as well as Doppler velocity and barometric and radar altimeters. The performance of the SARMC has been evaluated both by analysis and computer simulation. These evaluations accounted for all major system error sources, including errors associated with sensors, transfer alignment, and computation, with the system operating in an environment of moderate atmospheric turbulence. Results from these evaluations are presented.<<ETX>>","PeriodicalId":156436,"journal":{"name":"IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122202311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Ashtech XII GPS technology Ashtech十二GPS技术

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66175

J. Ashjaee

{"title":"Ashtech XII GPS technology","authors":"J. Ashjaee","doi":"10.1109/PLANS.1990.66175","DOIUrl":"https://doi.org/10.1109/PLANS.1990.66175","url":null,"abstract":"Several enhancements of GPS (Global Positioning System) technology are presented, including new data processing algorithms, enhanced application techniques, more hardware capabilities, and reduction in size and power consumption. The use of Doppler measurements for instantaneous (every one second) stationary position fixes is introduced. This technique has the potential of reducing the effect of selective availability in static point positioning. It is shown that the combination of Doppler and code phase measurements can provide two-dimensional deterministic static position fixes (and time) with only two satellites. It can also provide three-dimensional position fixes (and time) with three satellites. The proposed techniques expand the usage of GPS in areas with low satellite visibility and in the interim period while the GPS satellite constellation is not complete. The notion of multiple ramp smoothing of code phase with integrated Doppler is introduced. The results of implementation of this technique in Ashtech XII receivers for real-time differential GPS is given. Minimizing the errors in the use of GPS for aerial photogrammetry applications is discussed. A new technique implemented in Ashtech XII GPS is presented. A new generation of GPS receiver (Ashtech M-XII) is introduced. It is capable of performing precision survey, navigation, and time transfer. The 12-channel receiver uses a higher level of hardware integration. The results of Ashtech XII dual frequency receivers on the FGCC (Federal Geodetic Control Committee) test network are presented.<<ETX>>","PeriodicalId":156436,"journal":{"name":"IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122897238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Global Positioning System (GPS) autonomous navigation 全球定位系统(GPS)自主导航

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66220

M. Ananda, H. Bernstein, K. Cunningham, W. Feess, E.G. Stroud

引用次数: 97

Impact of navigation accuracy on the intervention rate in a highly automated air traffic control system 高度自动化空中交通管制系统中导航精度对干预率的影响

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66213

M.J. Rockman, R. Braff

引用次数: 0

A near real-time gravity gradiometer data review system 近实时重力梯度数据审查系统

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66223

S.J. Brzezowski, J.A. Cochand, L. Murano, J. White, J. L. Wylie, W. Heller

引用次数: 0

A fast and low-cost validation technique for ILS and MLS 一种快速、低成本的ILS和MLS验证技术

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66183

P. Mahapatra, M. Poulose

引用次数: 1

Determination of precise position of a moving vehicle with GPS 用GPS确定移动车辆的精确位置

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66187

C. Goad

引用次数: 1

The next frontier for strapdown RLG inertial systems. Precision navigation 捷联式RLG惯性系统的下一个前沿领域。精确导航

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66225

R. Upton, W. Miller

引用次数: 0

Ring laser gyro applications for tactical missiles: the Army TACMS solution 环形激光陀螺应用于战术导弹:陆军TACMS解决方案

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66226

G. Curran, D.J. Engelken

引用次数: 12

Application of electronic chart systems in the prevention of ship's groundings 电子海图系统在防止船舶搁浅中的应用

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI: 10.1109/PLANS.1990.66157

H. Lanziner, D. Michelson

{"title":"Application of electronic chart systems in the prevention of ship's groundings","authors":"H. Lanziner, D. Michelson","doi":"10.1109/PLANS.1990.66157","DOIUrl":"https://doi.org/10.1109/PLANS.1990.66157","url":null,"abstract":"It is noted that despite glowing recommendations from users, the market for electronic charts has not grown at the rate that many had expected. Some of the possible reasons for this are considered, and recommendations for corrective action are presented. One reason may be that shipping is a conservative and very cost-conscious industry; because ships have sailed without electronic charts in the past, it is difficult to convince owners that it is necessary to rush out and have one installed. The situation is compounded by the lack of international standards for electronic chart display (ECDIS) systems and, indeed, by the lack of international regulations requiring the use of ECDIS systems on board ship. However, it is generally recognized that electronic charts provide the only reasonable method of presenting precise position information to masters or pilots during critical maneuvering in restricted waters such as harbors and harbor approaches. As hardware becomes more sophisticated and capable, as experience is accumulated, and as precise positioning systems (e.g. GPS and RANAV) become widely available during the 1990s, it is expected that the market for electronic charts will grow tremendously.<<ETX>>","PeriodicalId":156436,"journal":{"name":"IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124280152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1