What is the difference between GPS and Glonass?

The  difference between GPS and GLONASS is that in GLONASS each satelilite has its own frequencies but the same code whereas in GPS als satellites use the same frequencies but have different codes.

GPS is an American System. GLONASS is a Russian System. The disribuation of the satellites diferers from one system to another. So if you want to achieve a good acuracy, you should use both systems because you would have a better coverage of satellites.

Both GPS and GLONASS are satellite based navigation systems. GPS was introduced in 1978 by United States and GLONASS in 1982 by Soviet Union. Over the year's research have been pioneered to have devices with both the GPS and GLONASS features. Range measurements in both the systems rely on microwave signals transmitted by satellite.

Each satellite in both the GPS and GLONASS systems transmits at a rate of 50 bits per second and communicate positioning information to mobile devices on the earth. Due to this slow speed it takes more time to obtain the information, to avoid this problem A-GPS and A-GLONASS systems have been designed.

Both A-GPS and A-GLONASS obtain assitance data at higher speed of about 100 Mbps from the wireless communication network(e.g. LTE base station,GSM/CDMA base station). This makes mobile devices obtain positioning information faster.

GPS was created and realized by the U.S. Department of Defense (DoD) and was originally operated with 24 satellites. It became fully operational in 1994. Each GPS satellite continuously transmits a microwave radio signal composed of two carriers, three to four codes, and a navigation message. GPS applies the code division multiple access (CDMA) principle, and as such, each GPS satellite emits a different Pseudo Random Noise (PRN) code. GPS was originally developed as a military system, but was made available to civilians as well. However, to keep a military advantage, the U.S. DoD provides two levels of GPS positioning and timing services: the Precise Positioning Service (PPS) for military use and the Standard Positioning Service (SPS) for everyone. GPS is currently undergoing a system modernization which will result in the improvement of the performance of GPS services. GLONASS is a radio-based satellite navigation system operated for the Russian government by the Russian Aerospace Defense Force. It complements and provides an alternative to GPS and is currently the only other fully-operational alternative navigation system in operation with global coverage and similar precision. Each satellite transmits the same PRN code but at different frequencies. GLONASS had achieved 100% global coverage with a full orbital constellation of 24 satellites. The GLONASS satellites' designs have undergone several upgrades, with the latest version being GLONASS-K.

Both are GNSS. 

GPS is control by USA whearas GLONASS is control by Russia.

 GPS Space Segment: The GPS constellation is formed by 30 satellites, with quasi-circular orbits, located between 20000km and 20500km from the Earth center. Four to eight satellites from the GPS constellation can be seen anywhere at a sight angle greater than 15 degrees.

GLONASS Space Segment: The GPS constellation is formed by 24 satellites, with quasi-circular orbits, located at 19100km  from the Earth center. Satellites are called "Ouragan"  M, K1, and K2.

GPS with GLONASS systemsElectronic navigation systems became widespread during World War II. This method of defining characteristics in terms of time delays provide broadcast signals from GLONASS and GPS Knd.hal due to the application of the system in our country comparison of the two systems will be discussed.GLONASS: Russian GPSGPS: GPS United StatesAll unique code for each satellite in the GPS and GLONASS systems only. In the event that a single code for all satellite systems are used.For personal and non-military users accuracy achieved through the GLONASS GPS system more than the accuracy provided by the system GLONASS satellites can not be sent SA in Ast.zyra deliberate error.Because the GPS system is wider frequency band GLONASS system interference caused by electromagnetic radiation than the atmosphere very much. Therefore to reduce the size of certain transmission frequency band plan for GLONASS satellites to predict and run.The Atomic Time and Universal Time, or UTC time GPS with the relevant US and GLONASS time with Atomic Time or UTC SU Moscow station linked to the difference can reach several microseconds.Both systems are designed for military purposes.Disadvantages GPS system against similar Russian system include:1-enforcement deliberate error on the satellite SA2. GPS satellite orbital data released updated every hour, but the Russian system every30 minutesMost or all Russian planes also fly in our country such as the Tu-154 and Antonov and Ilyushin cargo Army and the Russian use of this advanced system.Intentional corruption satellite signal: the usability of selected satellites (known as the abbreviation SA) is an intentional corruption signals, when it was established by the US Department of Defense. SA to the enemies of the system intended to prevent ultra-precise GPS signals using US Knd.dvlt SA on May2000 cut off to increase the accuracy of GPS receivers personal.1) Satellite: Satellite clock deviation is a circuit that contains the error.1-1 orbital error: due to incomplete modeling the dynamics of satellites in space. Orbital Orbital accuracy of the information inaccurate inactive mode S / A, m using precise orbital information about meters.□ how to deal with this bias:1. The easiest way to ignore Khtast.kh in many kinematic applications Myshvd.2- use with differential effects of bias circuit can be significantly reduced. If the satellite position error meter differential positioning error1PPm will assume Bvd.3- using computational circuits or Pricise Eph.1-2 satellite clock error:Satellite time to time due to the time difference GPS. GPS satellites carrying the theme of rubidium and cesium clock, which usually keep the GPS time with precision are good. No error active mode S / A, the satellite clock bias remained below1 microsecond or equal to300 meters.□ how to deal with this bias:1. Ignore this error in the application of precision Haykm2. Using the coefficients of the polynomial2 in messageNavigation, which in this case is accurate to20 nanoseconds.2) Name:2-1 Error multi-path or multi path: the GPS signals received by the receiver of a circuitous route through signal reflections Roy objects Mks levels of antenna around it. C / A maximum of293 m, to the P maximum3/29 m for phase carrier wave of L2 L15 cm less than5 cm. This work is reflected in places where obstacles such as buildings are commonly found remarkable.□ how to deal with this bias:1. Choose a site selection Mnasb2- Nvntn3. Choose the right angle ((cut angle2.2 Noise: noise random noise noise that no specific source is not obtained by a certain formula and can not be predicted.These noises have special properties are on the line is one of the most important function of these quantities Avtvkvrvlyshn3-1 m Weber on phase zero which is10.3 mm.

GPS SYSTEM : 

OWNER : USA.

FIRST LAUNCH : 22-FEB-1978

USERS : MILITRY & CIVILIAN .

NUMBER OF SV : 31.

ORBITAL PLANES : 6.

INCLINATION : 55 Degree.

PERIOD : 11h58m.

TIME SYSTEM : GPST.

CODING: CDMA.

FREQ : L1(1575.42),L2(1227.60),L5(1176.45).

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OWNER : RUSSIA.

FIRST LAUNCH : 12-OCT-1982.

USERS : MILITRY & CIVILIAN .

NUMBER OF SV : 24.

ORBITAL PLANES : 3.

INCLINATION : 64.8 Degree.

PERIOD : 11h15m.

TIME SYSTEM : UTC(SU).

CODING: FDMA.

FREQ : G1(16.02),G2(1246),G3(TBD).

In simple English : 

GPS is slightly better than GLONASS overall, but due to the different positioning of the GLONASS satellites, GLONASS has better accuracy at high latitudes (far north or south).

Both are the satellite navigation systems. GPS was started by US Defence and GLONASS by Russian defence.

GALILEO by europe is expected to be functional in 2016. BAIDEU AND IRNSS were launched by China and India respectively but only functional to local level.