estimation of multipath error in gps pseudorange measurements Bob White West Virginia

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estimation of multipath error in gps pseudorange measurements Bob White, West Virginia

You can download the paper by clicking the button above.GET pdf ×CloseLog InLog InwithFacebookLog InwithGoogleorEmail:Password:Remember me on this computerorreset passwordEnter the email address you signed up with and we'll email you In our approach, this is something fundamental as the multipath in kinematic scenarios is conceptually treated as high-frequency correlated multipath, depending on the platform dynamics and the distance to the reflector(s). Therefore, we need n + 1 observations. Read more» Oct 13, 2016 | 0 Comments UC Riverside team developing non-GPS nav system for autonomous vehicles A team of researchers at the University of California, Riverside...

Institution Name Registered Users please login: Access your saved publications, articles and searchesManage your email alerts, orders and subscriptionsChange your contact information, including your password E-mail: Password: Forgotten Password? ENGE,Stanford University, Stanford, CaliforniaSearch for more papers by this authorT. When the isolation of the initial multipath epoch is completed, we can recover multipath at every epoch using Equation (5). in experimental space science from York University, Toronto.

Login via OpenAthens or Search for your institution's name below to login via Shibboleth. This paper presents a novel method for vehicle navigation in the situation. Manufacturers The test of the MIMICS approach used two NovAtel OEM4 receivers in the vehicle each fed by a separate NovAtel GPS-600 “pinweel” antenna on the roof. See all ›7 CitationsSee all ›6 ReferencesShare Facebook Twitter Google+ LinkedIn Reddit Request full-text Estimation of Multipath Error in GPS Pseudorange MeasurementsArticle · March 1997 with 13 ReadsDOI: 10.1002/j.2161-4296.1997.tb01938.x 1st K.

Nevertheless, even a small separation between the antennas results in different and decorrelated phase-multipath errors, which are not removed by simply differencing measurements between the antennas. Figure 6. By sequentially differencing Equation (2) in time to remove the single-difference ambiguity from the observation equation, we obtain (as long as there is no loss of lock or cycle slips): (3) A time series of the single-difference multipath observations to be randomized is given as (8) Then our goal is to achieve the following condition: (9) It is obvious that the condition

However, with only two GNSS antennas it is still possible to determine yaw and pitch angles, which is sufficient for some applications in precision agriculture and construction. Digital Differentiators. Correlation between vehicle dynamics (heading angle) and the multipath spectra. Dr.

This method can estimate even the size of non-Gaussian error due to multipath in the urban canyon environment. Publications  Article Search  Browse Publications  Journal  Proceedings  Newsletter  Other Publications  Download Subscriptions  Buy Publications   Dedicated to the advancement of the art and science of positioning, navigation and timing (PNT).   Luis Serrano is a senior navigation engineer at EADS Astrium U.K., in the Ground Segment Group, based in Portsmouth, where he leads studies and research in GNSS high precision applications and In this article, we describe how a typical GPS-based machine automation application using a dual-antenna system is used to calibrate, in a first step, and then remove carrier-phase multipath afterwards.

He has a bachelor’s degree in urban engineering and an M.Sc.E. A feasibility study indicated that, for short-baseline vectors, four unknown variance factors can be associated with the single-epoch, dual-frequency GPS pseudoranges and carrier phases. PeckShuwu WuRead full-textData provided are for informational purposes only. A clear improvement is visible.

Bilich and K.M. We will outline our approach in a later section. From Equation (3), at the second epoch, for example, we will have: (5) If we continue this process up to epoch n, we will obtain an ensemble of differential multipath observations. and Ph.D.

Figure 3. E82-A, No. 12, December 1999, pp. 2822–2824. • Autoregressive Models and the Yule-Walker Equations Random Signals: Detection, Estimation and Data Analysis by K.S. The authors look at a technique to reduce multipath by using a pair of antennas on a moving vehicle together with a sophisticated mathematical model. Langley Multipath is real and omnipresent, a detriment when GPS is used for positioning, navigation, and timing.

Professor Langley is a fellow of The Institute of Navigation (ION), the Royal Institute of Navigation, and the International Association of Geodesy. It is quite flexible in terms of latency and filter order when it comes to deriving the observables. Furthermore, such antenna configurations typically only reduce the effects of low angle reflections and those coming from below the antenna horizon. Byun, G.A.

Figure 5. In this month’s column, I am joined by two of my UNB colleagues as we look at a technique that uses a pair of antennas on a moving vehicle together with Basically, it is dependent on the platform dynamics and the amplitude of the residuals of the whitened time series (meaning that if they exceed a certain threshold, then the filtering order Kim has been involved in GNSS research since 1991 and his research centers on high-precision positioning and navigation sensor technologies for practical solutions in scientific and industrial applications that require real-time

Read more» Oct 14, 2016 | 0 Comments Raytheon, US Air Force complete GPS OCX test milestone Raytheon has reached another milestone in its development of the... Since the distance between the mounting points on the antenna-support bar was accurately measured before the test (84 centimeters), we had an easy way to evaluate the solution quality. rgreq-f1dcb4b0419c3d237ced687ecb479ec7 false Skip to main content This service is more advanced with JavaScript available, learn more at http://activatejavascript.org Search Home Contact Us Log in Search GPS SolutionsJanuary 2013, Volume 17, Issue 1, Professor Langley is a collaborator in UNB’s Canadian High Arctic Ionospheric Network project and is the principal investigator for the GPS instrument on the Canadian CASSIOPE research satellite now in orbit.

Researchers have demonstrated that the coefficients of the maximally linear digital differentiator of order 2N + 1 are the same as the coefficients of the easily computed central-difference approximation of order Figure 2A. Kinematic test setup. The time series of the differenced ionospheric delays were then examined.

His research team is currently working on a number of GPS-related projects, including the study of atmospheric effects on wide-area augmentation systems, the adaptation of techniques for spaceborne GPS, and the This paper presents a new algorithm that can estimate multipath errors in real time for a stationary, single-frequency receiver in the case of one dominating, specularly reflected multipath signal. Hwang, published by Wiley, New York, 1997. “The Kalman Filter: Navigation’s Integration Workhorse” by L.J. This reduces the level of multipath on carrier-phase observations and thereby improves the accuracy of the vehicle’s position. "OUT, DAMNED MULTIPATH!

One can see from the bottom picture in Figure 2 the façade of the building behaving as the effective reflector. The equipment setup can be simplified, compared to that used in our test, if a single receiver with dual-antenna inputs is employed. We obtain the AR coefficients using the autocorrelation coefficient vector of the random sequences. Secondly, when the platform has multiple dynamics, multipath spectra will change accordingly starting from the low-frequency components (due to nearby reflectors) towards the high-frequency ones (including diffraction coming from the building

The results show that the estimation method has the potential of reducing both standard-deviation of errors and maximum errors in DGPS positioning by 40-50%. And unlike Lady Macbeth’s imaginary blood spot, multipath is real and omnipresent.