Purpose of the GNSS project was to propose the solution integrated in the chip that fits 3 requirements: (1) – GPS compatibility, (2) – Galileo compatibility, (3) – IoT compatibility. Under the IoT is considered the protocol of data transmission, like Lora for the long range.
Potential applications could be the tracking of rail freight, tracking of domestic animals like dogs and cats, tracking the ships and many other applications. So, briefly clients could be both physical persons and companies.
As for the GPS system, it’s composed on the 24 satellites all around the Earth with the speed about 14.000 km/h at the distance of 20 kilometers above the Earth. Satellites are moving and don’t use the geostationary orbit. The orbits are conceived in such the manner that in any moment at least 4 satellites are visible from any point on the Earth.
The precision of GPS is about 5…10 meters. And the precision of time at the satellite must be about n nanoseconds to guarantee such the precision of GPS.
But in reality because of permanent moving the satellite with regards on the observer on the Earth suffers the time dilation of 7 micro second per day according to Special Relativity Theory.
At the other hand, seen that satellite is permanently situated in the close electromagnetic fields of the Earth intersects it permanently, consequently this time because of the General Relativity Theory suffers the time acceleration at 45 microseconds per day. That gives the total acceleration of the time at 38 microseconds on the satellite. And if we don’t take into account this acceleration, the positioning error in GPS system would accumulate at 10 km per day!!
Technical realization of project.
The projects of Ubiscale are organized in function of clients. As was mentioned above, the principal application is the tracking of objects. As a consequence, we need ideally the triad of GNSS techniques: GPS(US)/Galileo(EU)/Glonass(RU) and the connectivity part that could be for example, Lora able to transmit the information on long distance, many kilometres with it’s techniques of chirps.
With the satellite information we also need to take into account the Doppler effect created because of satellites moving around the Earth as well as the in exactitude of time passing at the satellite because of theory of relativity: general and special.
Then all this technologies must be integrated in one chip with technologies of DSP converted to ASIC.
My participation in project.
My purpose as to detect the GPS signals giving the information on the geolocalization of object in question. As known, we need the information from at least three satellites to determine the exact position.
The main information base band is taken after despreading, synchronization and then demodulation.
Environment and techniques used in project.
Environment: RF part of GPS chip with base band samples output, Matlab.
Main results.
The first model has been developed by me under Matlab using GUI.
