Wats the CEP difference between the Navstar GPS system and the Galielio system? any comparisons?

Question

If a differential system is used,, will it be any better than a standalone system? I mean the ground components only

Answer 1

This question will receive a different answer from ten years ago. First a bit of background info on the Galileo system is in order.

The Galileo positioning system is a satellite navigation system, built by the European Union (EU) as an alternative to NAVSTAR (NAvigation Signal Timing And Ranging Global Positioning System) and the Russian GLONASS (GLObal NAvigation Satellite System). The system is to be operational by 2010 (original proposed date was Dec 2008).

The purpose of Galileo is intended to provide:
* Greater precision to all users than is currently available;
* Improved coverage of satellite signals at higher latitudes, which northern regions such as Scandinavia will benefit from;
* A positioning system upon which European nations can rely even in times of war or political disagreement.

The system is intended primarily for civilian use, unlike the U.S. NAVSTAR GPS system, which is primarily intended for the U.S Armed Forces. The U.S government reserves the right to limit the signal strength or accuracy of the GPS systems, or to shut down public GPS access completely (although it has never done either), so that non-military users cannot use it in time of conflict.

Until 2000, the precision of the signal available to non-military users was limited (known as selective availability or SA for short). The European system will only be subject to shutdown for military purposes in extreme circumstances (though its still vulnerable to jamming by with the right equipment), will provide a significant improvement to the signal available from GPS, and will, upon completion, be available at its full precision to all users, both civil and military.

Galileo utilizes 30 satellites in Mid-Earth Orbit (MEO, approx 23,222km). The GPS utilizes 24 satellites in geosynchronous orbit, with 3 of those satellites acting as spares.

There will be four different navigation services available:
- The Open Service (OS) will be free for anyone to access. The OS signals will be broadcast in two bands, at 1164–1214 MHz and at 1563–1591 MHz. Receivers will achieve an accuracy of <4 m horizontally and <8 m vertically if they use both OS bands. Receivers that use only a single band will still achieve <15 m horizontally and <35 m vertically, comparable to what the civilian GPS C/A service provides today. It is expected that most future mass market receivers, such as automotive navigation systems, will process both the GPS C/A and the Galileo OS signals, for maximum coverage.

- The encrypted Commercial Service (CS) will be available for a fee and will offer an accuracy of better than 1 m. The CS can also be complemented by ground stations to bring the accuracy down to less than 10 cm. This signal will be broadcast in three frequency bands, the two used for the OS signals, as well as at 1260–1300 MHz.

- The encrypted Public Regulated Service (PRS) and Safety of Life Service (SoL) will both provide an accuracy comparable to the Open Service. Their main aim is robustness against jamming and the reliable detection of problems within 10 seconds. They will be targeted at security authorities (police, military, etc.) and safety-critical transport applications (air-traffic control, automated aircraft landing, etc.), respectively.

In addition, the Galileo satellites will be able to detect and report signals from COSPAS-SARSAT search-and-rescue beacons in the 406.0–406.1 MHz band, which makes them a part of the Global Maritime Distress Safety System.

GPS offers two CEP accuracy ratings, depending on the user's receiving equipment and services available. The accuracy is as follows:

- with SA (Selective Availability) enabled: approx >13m CEP accuracy [32ft] horizontally, >30m [100ft] vertically

- with SA disabled: approx <4m CEP horizontally, <10m vertically

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You mentioned about the user's choice of ground components. As a civilian user, there isn't really much you can do about it. Most of the receivers you see in the civilian market nowadays offers a pretty decent CEP accuracy, most of them less than 3.5 meters horizontally and 5 meters vertically. DGPS (Differential GPS), utilizing a fourth satellite for a final navigation reference and fix, is more than sufficient for general use like driving and boating.

My advice is that if you are planning, say for a long trip by driving, get a detailed map of the area you are traveling to and those that you need to pass through. Maps should have a scale of preferably 1:10000 or if possible 1:500 (its out there, but difficult to find).

Answer 2

the Galileo GPS system will take it's position with at least 4 satellite's so the position will be much more accurate ( 1 meter ). The standard reception for a receiver is free of charge so the receivers will be cheaper, for a more accurate receiver there's a a charge to pay but that's for the professional user. The military are again on a separated level so the precision for the civilian user will always be the same. On the American GPS you re at the goodwill of the military for the precision of you position (in time of war they can change the signals )

Answer 3

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