PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)最新文献_第5页

The development of a SAR dedicated navigation system: from scratch to the first test flight SAR专用导航系统的研制:从无到有到首次试飞

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309001

J. Lorga, W. V. van Rossum, E. van Halsema, Q. Chu, J. Mulder

{"title":"The development of a SAR dedicated navigation system: from scratch to the first test flight","authors":"J. Lorga, W. V. van Rossum, E. van Halsema, Q. Chu, J. Mulder","doi":"10.1109/PLANS.2004.1309001","DOIUrl":"https://doi.org/10.1109/PLANS.2004.1309001","url":null,"abstract":"In this paper, the authors propose to describe the development process of a navigation system, concerning synthetic aperture radar (SAR) applications, starting from the motivation for the sensor selection and finalizing with the first flight-test results. Sensor selection was one of the first steps in the design. Motivations for the accelerometers, gyroscopes, Global Positioning System (GPS) board, magnetometer and all the other hardware components, like temperature-sensor selection, are explained. A complete description of the hardware integration process, where details like sensor output time synchronization, signal digitalization and calibration are addressed, is given. The developed software is fully explained: starting from the digitalized signals and ending in the flight path outputted by the iterative extended Kalman filter. The developed software includes several features that allow the development of an inertial navigation system (INS) focused on SAR applications. The first flight tests have taken place on board of a Cessna Citation II jet aircraft. Results from these flight tests are presented as an evaluation of the performances of the INS.","PeriodicalId":102388,"journal":{"name":"PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114128768","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: 5

Market opportunities for advanced MEMS accelerometers and overview of actual capabilities vs. required specifications 先进MEMS加速度计的市场机会，以及实际能力与所需规格的概述

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1308977

Stauffer Jean-Michel

{"title":"Market opportunities for advanced MEMS accelerometers and overview of actual capabilities vs. required specifications","authors":"Stauffer Jean-Michel","doi":"10.1109/PLANS.2004.1308977","DOIUrl":"https://doi.org/10.1109/PLANS.2004.1308977","url":null,"abstract":"The worldwide accelerometer business is split in two distinctive markets: The \"movement monitoring and event detection\" world in one hand, largely driven by the automotive business and low cost consumer business and the \"measurement and control\" world in the other hand, mainly driven by the aerospace and inertial navigation business and historically served principally by conventional relative high cost micro mechanical products. It took nearly 20 years until MEMS products achieved a commercial breakthrough in the automotive. Today, with a mature technology and high-volume production at low cost, MEMS acceleration sensors are in the best position to successfully move into traditional inertial applications and also to render possible newly emerging applications. The various domains constituting the worldwide market will be discussed in detail and required specifications for inertial sensing, tilt sensing and vibration sensing will be analyzed. Today, high performances MEMS capacitive accelerometers, offering the required long-term stability and vibration rectification error characteristics are produced to serve inertial guidance and navigation for aeronautic and defence applications. Furthermore, these products are offering advanced functionalities and are performing extremely well without degradation of specifications in rugged environments such as gun hard shocks with amplitudes higher than 20'000g. We propose to share qualification results and comment the actual performances available. Finally, future requirements will be presented and actual or future solutions will be discussed in more details.","PeriodicalId":102388,"journal":{"name":"PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127018539","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: 32

Some design aspects of mobile local positioning systems 移动局部定位系统的一些设计方面

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309009

H. Saarnisaari

{"title":"Some design aspects of mobile local positioning systems","authors":"H. Saarnisaari","doi":"10.1109/PLANS.2004.1309009","DOIUrl":"https://doi.org/10.1109/PLANS.2004.1309009","url":null,"abstract":"New radio technology suit very well to implement mobile positioning systems, because the future signals are wideband and software radio (SDR) defined platforms are used for implementation. If the used communication system is not sufficient for required positioning purposes, the SDR principle allows that the same platform is used or divided by a positioning system. These positioning systems function anywhere where the underlying communication systems have a sufficient coverage for positioning. Alternatively, a sufficient coverage can be guaranteed locally by establishing a positioning network. These local mobile positioning systems serve as a backup to or as a more robust alternative to global navigation satellite systems that are known to be rather vulnerable to interference. In this paper some design aspects of interference immune local mobile positioning systems are considered. The considered topics include a short introduction to the Finnish Software Defined Radio Programme, which covers both communications and positioning systems in the same platform. Topics considered herein include also positioning network design, delay estimation in frequency hopping systems with few samples and interference mitigation techniques both for single antenna and adaptive antenna receivers.","PeriodicalId":102388,"journal":{"name":"PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127777789","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: 3

In-building intruder detection for WLAN access 用于WLAN访问的建筑物内入侵者检测

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309047

A. Hatami, K. Pahlavan

{"title":"In-building intruder detection for WLAN access","authors":"A. Hatami, K. Pahlavan","doi":"10.1109/PLANS.2004.1309047","DOIUrl":"https://doi.org/10.1109/PLANS.2004.1309047","url":null,"abstract":"In recent years wireless local area network (WLAN) has become a popular choice for local area networking in both enterprise and home networking. Increased data rate and price reduction in IEEE 802.11b-g devices has made WLANs even more attractive in these markets. User mobility has opened a new market for location aware, and pervasive computing applications. As a service to these new applications, security and user authentication plays a more important role in a wireless environment compared to the conventional wired systems. In the corporate WLAN environment, since a mobile wireless networks intruder can access the network without physical presence inside the buildings, the solutions for intruder detection has attracted considerable attention by the research community. In this paper we first provide an overview of the traditional location sensing and intruder detection algorithms that are using the existing IEEE 802.11 infrastructure. Then we introduce a new algorithm targeted for intruder detection and authentication in a WLAN network. The new algorithm uses indoor radio propagation modeling to reduce complexity of the calibration process used in the existing algorithms. The performance of the existing and the new algorithm in the first floor of the Atwater Kent Laboratory at the Worcester Polytechnic Institute is used as a basis to compare the performances.","PeriodicalId":102388,"journal":{"name":"PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128087809","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: 27

Unaided acquisition of weak GPS signals using circular correlation or double-block zero padding 使用圆形相关或双块零填充的微弱GPS信号的独立采集

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309030

N. Ziedan, J. Garrison

{"title":"Unaided acquisition of weak GPS signals using circular correlation or double-block zero padding","authors":"N. Ziedan, J. Garrison","doi":"10.1109/PLANS.2004.1309030","DOIUrl":"https://doi.org/10.1109/PLANS.2004.1309030","url":null,"abstract":"Acquisition of very weak GPS signals requires long coherent and incoherent integration. Increasing the coherent, or predetection, integration time (PIT) improves sensitivity, but is limited because of the unknown data and bit edges. Incoherent integration is less sensitive, because of squaring loss. Two algorithms are developed to use a PIT which is a multiple of one data bit interval, without requiring assisting information. Both algorithms estimate the most likely data bit combination and use this to subsequently reverse the data signs over each PIT and synchronize the start of each PIT. The algorithms differ in the method of coherent integration. One uses circular correlation (FFT/IFFT), the other uses double block zero padding (DBZP). Circular correlation requires larger numbers of Doppler bins as the PIT is increased. In contrast, DBZP does not use Doppler bins, but suffers from loss because it does not account for the Doppler effect on the code duration. Consequently, the varying delay between the received signal and the replica will cause subsequent incoherent integrations to be added at the wrong delay. Solutions have been developed for each of these problems. In the case of circular correlation, a small PIT is used initially and after few steps the Doppler bins which have the lowest likelihood are eliminated. Thus, the PIT can be increased without increasing the total number of Doppler bins. In the case of DBZP, an approach is developed to compensate for the change in the code duration and relative delay, with only a small increase in the processing requirement. Simulations indicate that both of these algorithms can acquire signals below 15 dB-Hz. The problem of acquiring weak signals in presence of strong interfering signals is also addressed.","PeriodicalId":102388,"journal":{"name":"PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)","volume":"92 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125696627","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: 77

An unscented Kalman filter for in-motion alignment of low-cost IMUs 一种用于低成本imu动态对准的无气味卡尔曼滤波器

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309005

Eun-Hwan Shin, N. El-Sheimy

引用次数: 135

Assimilative modeling of low latitude ionosphere 低纬度电离层同化模拟

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309040

X. Pi, Chunming Wang, G.A. Hajl, I. Rosen

引用次数: 7

Application of wavelet packet analysis in the de-noising of MEMS vibrating gyro 小波包分析在MEMS振动陀螺去噪中的应用

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1308984

Wan Chang-hong, Huang Xu

引用次数: 3

Maximum likelihood time of arrival estimation for real-time physical location tracking of 802.11a/g mobile stations in indoor environments 室内环境下802.11a/g移动站实时物理位置跟踪的最大似然到达时间估计

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1309046

P. Voltz, D. Hernandez

{"title":"Maximum likelihood time of arrival estimation for real-time physical location tracking of 802.11a/g mobile stations in indoor environments","authors":"P. Voltz, D. Hernandez","doi":"10.1109/PLANS.2004.1309046","DOIUrl":"https://doi.org/10.1109/PLANS.2004.1309046","url":null,"abstract":"This paper describes a new method of time of arrival (TOA) estimation for OFDM signals in indoor multipath environments for application to location tracking systems based on time difference of arrival. The problem addressed is to estimate the line of sight (LOS) time delay between the transmitter and the receiver when the intervening multipath channel is not known. In our approach, we do not attempt to determine the detailed multipath structure of the channel but, instead, use statistical knowledge of the multipath environment to aid in the estimation of the single parameter of real interest. We separate the gross time delay (LOS time delay) from the fine multipath structure of the channel. We then assume a statistical model of the multipath structure and develop the maximum likelihood estimator of the LOS time delay under the assumed model. Analytical development reduces the estimator to an efficient form in which most of the computational effort is done off line. Simulation results are presented which compare the performance of the new estimator to one which uses the well-known MODE technique for estimating the TOA and the new estimator is shown to compare favorably, especially as the number of paths increases. The simulations also show that the estimator is robust to variations in the assumed statistical model.","PeriodicalId":102388,"journal":{"name":"PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)","volume":"14 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114127298","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: 61

Initial calibration of an inertial measurement unit using an optical position tracking system 使用光学位置跟踪系统对惯性测量单元进行初始校准

PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556) Pub Date : 2004-04-26 DOI: 10.1109/PLANS.2004.1308980

Anthony Kim, M. F. Golnaraghit

引用次数: 106