Method for defining the error of reference time and an electronic device

A positioning system which comprises a receiver comprising at least means for forming a reference time, and means for receiving the code-modulated signal transmitted by satellites, which code-modulated signal is produced by means of a code individual for each satellite and the code-modulated signal is modulated at least with binary modulation information, and which positioning system comprises means for defining the time of transmission ( T ^ ToT k )

• of the signal received from the satellite used in the positioning and means for defining the location of the satellite, wherein the positioning system also comprises positioning means for defining the location ( x ^ _ u )
• of the receiver, means for calculating an error value on the basis of the defined location ( x ^ _ u ) ,
• means for searching the minimum of the error value by defining the location ( x ^ _ u )
• of the receiver by means of at least two locations ( x ^ _ SV k )
• of the satellites corresponding to the time of transmission of the signal and by calculating an error value for said at least two defined locations ( x ^ _ u )
• of the receiver, wherein the error of the reference time is arranged to be defined on the basis of the searched minimum of the error value, and that the receiver also comprises means for defining the moment of bit change in the modulation information and means for using said moment of bit change to specify the error of the reference time.

An electronic device which comprises at least means for forming a reference time, and a receiver comprising means for receiving a code-modulated signal transmitted by satellites, which code-modulated signal is produced by means of a code individual for each satellite and the code-modulated signal is modulated at least with binary modulation information, means for defining the time of transmission ( T ^ ToT k )

• of the signal received from the satellite used in the positioning and means for defining the location of the satellite, wherein the electronic device also comprises positioning means for defining the location ( x ^ _ u )
• of the receiver, means for calculating an error value on the basis of the defined location ( x ^ _ u ) ,
• means for searching the minimum of the error value by defining the location ( x ^ _ u )
• of the receiver by means of at least two different locations ( x ^ _ SV k )
• of the satellites corresponding to the time of transmission of the signal and by calculating an error value for said at least two defined locations ( x ^ _ u )
• of the receiver, wherein the error of the reference time is arranged to be defined on the basis of the minimum of the searched error value, and that the receiver also comprises means for defining the moment of bit change in the modulation information and means for using said moment of bit change to specify the error of the reference time.