the calculated relative speeds of the satellites the preliminary positional coordinates can be calculated as explained in connection with fig1 the preliminary positional coordinates are fed to the comparison block 7 the signal 2 transmitted by the satellite s 1 also includes a predetermined code c this code c c a code course acquisition is unique for the satellite in question and it is transmitted precisely predefined moments of time with intervals of 1 ms block 6 of the receiver is generating the same c a code and it tries to match it up to the c a code received from the satellite the receiver compares the two codes to determine how much it needs to delay or shift its code to match the satellite code thus block 6 is aware of the delay or shift for each satellite this delay or shift is multiplied by the speed of light in order to obtain the pseudo distance to the satellite in question the calculated pseudo distances are forwarded from block 6 to the comparison block 7 and to block 8 the comparison block 7 receives as explained earlier from block 5 the locations of the satellites and the preliminary positional coordinates of the receiver thus the comparison block 7 is able to calculate the distances between the preliminary positional coordinates and the locations of the satellites the calculated distances are compared to the pseudo distances received from block 6.