In the June 1999 issue of GeoInformatics the benefits of Global Positioning System (GPS) signal modernization to the civil GPS community were discussed.
With the decision of the European Union (EU) in March this year to develop its own satellite navigation system, Galileo, and have this system operational by 2008, this may be a good opportunity to look again at the modernized GPS and Galileo signals.
The new GPS signals will affect both the space and user segment, i.e., both satellites and receivers.
No final decision has been taken yet with regard to the frequencies and signals to be used by Galileo.
GPS buoy project
Differential Global Positioning System (DGPS) height measurements are sufficiently accurate for the establishment of tidal datums to be used for dredging.
This paper describes the use of differential On-The-Fly (OTF) real-time kinematic GPS measurements and the National Ocean Service (NOS) Modified Range Ratio Method to compute tidal datums in offshore areas.
Many methods of datum determination have been developed, depending on local channel conditions and the availability of a suitable operating control station, with published 19-year tidal datums.
Benchmarks on or near the structures are the physical links used to recover the tidal datum before construction events and to provide confidence in the water level history used to compute the tidal datum.
GPS battery
NOTE This document assumes that you are using Etak Skymap software with your Etak GPS antenna.
If you are using another software program, please consult that program's user documentation for Etak GPS antenna initialization instructions.
The Etak GPS antenna battery should last for several years under normal use.
Be sure your laptop computer's battery is fully charged so that you do not lose power during the initialization process.
Negative terminal Small metal tabs holding battery in place Insert screw driver here NOTE This document assumes that you are using Etak Skymap software with your Etak GPS antenna.
5. Start typing the name of the largest city within about 100 miles of your location.
What is GPS and Activity 1 http://www.stoller-eser.com/PDF/What is GPS and Activity 1.pdf
GPS is an abbreviation for Global Positioning System.
Have you ever spent an evening staring at the stars and saw something that was moving (so it wasn't a star), but moving too slow (so it wasn't a plane)?
They are used for a wide range of purposes; satellite TV, cellular phones, military purposes and etc. Satellites can also be used by GPS units.
With the correct dictionary chosen, we're ready to start a new roving file.
The Point feature is used when you are collecting the information and location of a sign, a building, or weed patch for example.
This means that while we are collecting data, we have two more Data screens available.
gps_inertial_basics
There are a growing number of applications worldwide that require regularly updated vehicle position and sometimes orientation.
For example, applications based on in-car navigation systems require that the navigation computer know the position of the car on the earth.
In many cases, this requirement can be met using GPS (Global Positioning System).
GPS is a network of 28 satellites that orbit the earth.
GPS-enabled systems are capable of receiving and processing these signals.
Perhaps the application cannot afford the occasional loss in position data caused by blocked satellites, or requires data updated more frequently than is possible with current receiver technology.
Sielski
Last 12 Block IIRs - add second civil signal (C/A on L2) and new military signal (M-code) - more signal power First 6 Block IIFs ("IIF Mod Lite") - all of above capabilities plus new third civil signal in protected band (L5).
Next [nominally] 6 Block IIFs - procured as necessary to sustain the constellation.
· More reliable and accurate positioning worldwide!
What does Modernization mean to GPS users?
GloballyCorrectedGPSCNav http://www.navcomtech.com/docs/GloballyCorrectedGPSCNav.pdf
Low-cost, high-quality, dual frequency GPS receivers were developed for use as both reference receivers and mobile receivers; Special dual frequency extended smoothing techniques were developed which allow the use of refraction corrected measurements for both the reference and mobile receivers, resulting in removal of ionosphere as an error source, and in significant reduction in errors due to multipath - two of the largest error sources in a WADGPS system; A new L-band satellite communication receiver was developed which uses a single, multi-function antenna designed to receive both of the GPS frequencies (L1 and L2) and the Inmarsat L-band communication frequencies (1525-1565MHz); Wide area Correction Transform (WCT) correction algorithms were developed which exploit the dualfrequency architecture of the system to generate a single set of corrections uniformly accurate across any continental region resulting in lower bandwidth requirements and more centralized processing; redundant subsystems and monitoring equipment are utilized to provide a high degree of system reliability, availability and service integrity; The Real-Time correction algorithms were developed by JPL, and implemented in their Real Time GIPSY software (RTG).
kuo_rime
1. Introduction micro-satellites each carrying an advanced GPS In a workshop held at Byrd Polar Research receiver and will provide ~3,000 radio occultation Center in May 2000 (Bromwich and Cassano soundings that are distributed uniformly around the 2001), it was concluded that numerical weather globe.
several days in advance for most parts of the As discussed by Kuo et al (2000) the raw Antarctic continent.
However, in comparison with measurements of the COSMIC system are phase populated areas of the Northern Hemisphere the and amplitudes of GPS radio signals.
In particular, it was use of local spherical assumptions, these raw recognized that: "The current state of modeling in measurements can be converted to bending Antarctica does not properly represent the angles and refractivity.
Syllabus http://www.seismo.berkeley.edu/~battag/GAMITwrkshp/Syllabus.pdf
GPS data processing using the GAMIT/GLOBK software package (from raw GPS data to site deformation velocity) The workshop will last 6 weeks.
Not to worry about it, but there will be weekly home works (students are encouraged to bring their own data set) B. Hofmann-Wellenhof, H. Lichtenegger and J. Collins.
GAMIT/GLOBK documentation (available as PDF files from the instructors) Laboratory lecture notes P.J.G. Teunissen and A. Kleusberg (Eds).
A bit expensive ($90 -- available at Amazon.com) but very good reference.
Documentation for the GAMIT GPS analysis software.
Global Kalman filter VLBI and GPS analysyis program.
GPS constraints on plate kinematics and dynamics in the eastern Mediterranean and Caucasus.
GPS_field http://www.nv.blm.gov/gis/winn files/GPS_field.pdf
Keep in mind that almost all GPS data can be imported in to the Geographic Information System (GIS) and should be collected with GIS in mind for your final product.
You will need to take at least two camcorder batteries from the battery chargers.
Hook up all the cables and place the antenna in a usable place.
In the "Logging options" menu under "Logging intervals", "Point feature should be set to 1 second and "Line/area should be set to 1,5,10, or 15 seconds.
Data dictionaries can be created for your project in the office before you go to the field.
Galileo-GPS
Wednesday, June 19, 2002 It is a pleasure to be with you today to discuss a range of issues concerning the military dimension of the relationship between GPS and Galileo.
I appreciate that this conference has been addressing a much broader range of space issues, so let me begin by noting that NATO has been involved in space since 1976, with the launch of NATO III A, the Alliance's first satellite communication system (SATCOM).
The M-Code will be used by U.S. and NATO forces for crucial military operations, including navigation and precision-strike.
Although the Commission has emphatically stated that Galileo will not be under EU military control, it has acknowledged that it cannot be excluded that EU militaries will be able to use it in some respects.
web_auger_gps2 http://webusers.physics.umn.edu/~duvernoi/web_auger_gps2.pdf
In this short note, I'd like to update my comments from GAP-98-007 and add some new information on GPS re-broadcasting, time and phase transfer experiments, a few notes on recommended test procedures, and some references that have been useful to me.
This consists of an amplified GPS antenna, either a high-gain timing antenna or a lower-gain general-purpose antenna, connected to a small amplifier and broadcast antenna at the other end of up to about 100 meters of cable.
For semi-permanent installations, another advantage of this setup is the considerable reduction in the complexity of the lightning protection scheme.
Experiments using a pair of inexpensive, commercial Garmin GPS units, Garmin differential correction (DGPS) receivers, and the St. Paul, Minnesota DGPS beacon were performed to look at errors in DGPS timing between two receivers.
