Phase difference for attitude determination using a dual antenna gps receiver

  • 0.46 MB
  • English
University of Surrey , Guildford
StatementDaniel Morros.
ID Numbers
Open LibraryOL19592166M

20/ (MJ) Danish GPS Center 30 Software Start Load simulated attitude Start User Interface + Initialize Testbed GPS receiver LON nodes Store angle-values from encoders in file Proces 2 Store phases and LOS vectors from receiver in file Proces 1 Send angle commands to LON nodes Proces 3 Stop.

GPS, attitude determination, antenna, multipath. ACRONYMS ADGPS Attitude Determination using GPS AOCS Attitude & Orbit Control System ADOP Attitude Dilution Of Precision DD Double Difference (phase measurements) GPSS GPS Satellite MBD Matra BAe Dynamics MMS Matra Marconi Space PVT Position Velocity and Time.

GPS Attitude Determination Reliability Performance Improvement Using Low Cost Receivers. is the double difference antenna phase center.

Description Phase difference for attitude determination using a dual antenna gps receiver FB2

in multi-antenna GPS attitude determination system. If three or more GPS antennas are mounted properly on a platform and differences of GPS signals measurements are collected simultaneously, the baselines vectors between antennas can be determined and the platform orientation defined by these vectors can be calculated.

Thus, the prerequisite for attitude determination technique based on GPS is to calculate baselines between antennas to Cited by: 9. Attitude Determination from Single-Antenna Carrier-Phase Measurements Thomas B. Bahder U. Army Research Laboratory Powder Mill Road Adelphi, Maryland, USA (December 9, ) A model of carrier phase measurement (as carried out by a satellite navigation receiver) is formulated based on electromagnetic theory.

A multi-antenna GPS array has been used by many researchers and in practise and to determine the attitude parameters of a mobile platform. At the heart of high accuracy real-time GPS-based attitude determination is the quick and correct resolution of the carrier phase ambiguities.

A MATLAB toolbox for attitude determination with GPS multi-antenna systems -- by Zhen Dai, Stefan Knedlik, & Otmar Loffeld The technical paper which describes this code is published in GPS Solutions, Vol Number 3, Julypages"A MATLAB toolbox for attitude determination with GPS multi-antenna systems".

attitude determination. This is followed by a discussion of Kalman filters, which will be used to sequentially process GPS measurements for attitude information. I Aititude Defemination Using DMer;enfial Phase Determining attitude by any method is equivalent to finding the orientation of one coordinate system with respect to another.

approach using GPS attitude determination has been rapidly developing for space applications. InGPS attitude determination was demonstrated for the first time on the RADCAL satellite 1. Using an onboard GPS receiver and multiple GPS antennas, GPS attitude sensing can be achieved through carrier phase difference measurements between two.

The attitude of a vehicle can be precisely determined using GPS (Global Positioning System) carrier phase measurements from more than two antennas attached to the vehicle with properly applied. Attitude Determination by Means of Dual Frequency GPS Receivers Vadim ROKHLIN and Gilad EVEN-TZUR, Israel Key words: GPS, Attitude determination, Dual frequency receiver SUMMARY In many civil and military systems direction finding with high accuracy is of top importance.

Attitude is measured relative to the IMU frame. Output can be configured based on the object's orientation frame instead of the IMU frame; A SPAN system typically consists of one antenna, one GNSS receiver and one IMU.

Dual antenna SPAN systems are also available to enhance initialization time and long term stability of the system. Attitude Determination GPS/INS Integration System Design Using Triple Difference Technique receiver does not give an accurate attitude output [17, 18].

Therefore, these weaknesses should be overcome in order to use the advantage on the integer ambiguity of the time difference of the double differenced carrier phase measurement.

Details Phase difference for attitude determination using a dual antenna gps receiver EPUB

Stand-alone, unaided, single frequency, single epoch attitude determination is the most challenging case of GNSS compass processing. For land vehicle applications, the baseline approximately lies in the plane of the local geodetic horizon.

This provides an important constraint that can be exploited to directly aid the ambiguity resolution process. We fully integrate the constraint into the Cited by: A static experiment is carried out to test the performance of the two algorithms.

The GPS design matrices needed for the simulations were constructed by means of the VISUAL software [20], using the assumed receiver locations and the actual GPS satellite constellation information in YUMA ephemeris format on Janu The further details are given the simulation inputs in table by: 6.

GPS and QZSS receiver for micro and small satellites. Dual GPS antenna enables positioning at any attitude. Inner combination of signals from two antennas. • The antenna body frame ‐ABF.

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Attitude Determination • Attitude of a rigid body platform is determined by the orientation of the specified body frame coordinate system with respect to the reference coordinate system.

• By using a GPS multi-antenna system, the attitude of. Gps IIF-1 satellite Antenna phase Center and Attitude modeling Calculating the distances between satellites and user equipment is a basic operation for GNSS positioning.

More precisely, these ranges are measured from the antenna phase centers of the satellites’ transmitting antenna. File Size: 1MB. The fundamentals of GPS attitude determination are well covered in the literature, with[6] being the standard reference. Consequently, a rather brief overview is all that will be required in order to introduce the changes necessary for differential phase-center calibration [adapted from 6].

In two dimensions, the determination of orientation by. receiver design as well as the direct and reflected signal strengths, path delay and phase difference, and can be up to half a chip [1] [2] [3].

Multipath interference also affects carrier phase determination, producing errors of up to quarter of a wavelength. Multipath errors can be positive or negative, depending on the phase difference between.

GPS, attitude determination, Ashtech Z12 receiver, integer ambiguity. Introduction The Global Positioning System (GPS) is poised to revolutionize many fields of application. Extensive applications of GPS are accomplished due to technology development and consequently, reduction of receiver cost, power, size and weight.

Vehicle experiment suggest that if we adopt reasonable threshold to mitigate the measurement error, and simultaneously use sudden change detection to eliminate the offset error, the GNSS single-antenna pseudo-attitude determination method can be used to measure the attitude of low speed carriers at m/s : Wen Chen, Chao Yu, Miaomiao Cai, Yaxuan Dong.

1 Attitude Determination in a Survey Launch Using Multi-Antenna GPS TechnoZogies 3 R(y, p, r) as a nine independent parameter matrix and thus do not make full use of all the position information contained in multiple GPS antennas. In the case that four or more GPS antennas are in one plane, the z-component of all the antenna’s body.

A GPS receiver can measure only the fractional part of the carrier phase. The integer number of wavelengths between antenna and satellite is unknown. This is the well-known integer ambiguity resolution problem. Two approaches have been developed to resolve the integer ambiguity problem for GPS-based attitude Size: KB.

5 Definition of Receiver Antenna Mask (1/3) Assume that the receiver antenna is omni‐directional with respect to the azimuth pattern reasonable assumption, as shown later.

The receiver antenna mask then refers to the elevation antenna pattern. For near‐the‐ground GPS applications, the File Size: 1MB. tems for attitude determination.

Methods to determine the attitude of the aircraft using a known wind vector and angle of attack and a single antenna GPS receiver already exist. In this colloquium a new method for attitude determination using a single GPS receiver aided with an aerodynamic model and a Kalman fllter will be presented.

Using no. However, attitude determination of vehicles, such as spacecraft or aircraft, has gained much attention. The main measurement used for attitude determination is the phase difference of the GPS signal received from two antennas separated by a baseline.

The principle of the wavefront angle and wavelength, which are used toFile Size: KB. using velocity measurement of Single-antenna GPS receiver. Determined attitude is called pseudo attitude because it is differs from true attitude slightly.

Its pseudo pitch angle is equal to FPA (Flight Path Angle) and its pseudo yaw angle is equal to angle between true north and ground velocity vector. In normal cruising condition, we can. Shop, read reviews, or ask questions about UNIDEN GPS Antenna Receiver at the official West Marine online store.

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2 Attitude Determination Algorithm GPS attitude determination with carrier phase measurements is based on the principal of interferometry. Fig. 4 depicts a carrier phase signal from a GPS satellite arriving at two antennas separated by the distance b.

The differential range from the antennas to 2. The utilization of Global Positioning System (GPS) signal-to-noise ratio measurements (SNR) from a single antenna receiver is an innovative approach for attitude determination of LEO spacecraft.

For spacecraft that are orbiting below the GPS constellation, GPS sensors have proven to be a low cost solution for orbit determination.Antenna Baseline Filter.

This attitude estimation algorithm begins with antenna baseline determination using a Kalman filter. The Kalman filter estimator is a linear state estimator which was developed by Kalman, Swerling, and Bucy in a series of papers which detail its formulation and implementation [17–19].A full derivation of the Kalman filter can be found in Crassidis and Markley Author: Nathan A.

Tehrani, Jason N. Gross.GPS Antennas - Application Note Antenna placement. The position of the antenna mounting is crucial for an optimal performance of the GPS receiver. When using patch antennas, the antenna plane should be parallel to the geographic horizon.

The antenna must have fullFile Size: 1MB.