Global positioning system and global positioning apparatus

A GPS positioning method comprising the steps of:

• obtaining a data sequence having a polarity from a GPS signal;
• dividing the data sequence into predetermined sections;
• subjecting the sections obtained in the first step to polarity inversion based on navigation data derived form the GPS signal, and calculating a cumulative sum of values at the same bit position in the respective blocks each having a length of a C/A code;
• performing a correlation calculation using the C/A code based on a result of the third step;
• determining a correlation peak position based on a correlation peak value obtained as a result of the correlation calculation;
• and
• determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on the correlation peak position obtained for each of the sections.

A GPS positioning method comprising the steps of:

• obtaining a data sequence having a polarity from a GPS signal;
• performing polarity inversion based on navigation data derived from the GPS signal and calculating a cumulative sum of values at the same bit position in respective blocks each having a length of a C/A code;
• performing a correlation calculation using the C/A code based on a result of the second step;
• determining a correlation peak position based on a correlation peak value obtained as a result of the correlation calculation;
• and
• determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on the correlation peak position;
• and
• shifting the navigation data according to a binary scan method when a desired peak value is not obtained and performing polarity inversion using the shifted navigation data.

A GPS positioning method comprising the steps of:

• obtaining a data sequence having a polarity from a GPS signal;
• performing polarity inversion based on navigation data derived from the GPS signal and calculating a cumulative sum of values at the same bit position in respective blocks each having a length of a C/A code;
• performing a correlation calculation using the C/A code based on a result of the second step;
• determining a correlation peak position based on a correlation peak value obtained as a result of the correlation calculation;
• and
• determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on the correlation peak position;
• and
• shifting the navigation data when a desired peak value is not obtained and performing polarity inversion using the shifted navigation data, wherein
• the sixth step is repeated until a maximum of the correlation peak value is obtained.

A GPS positioning method comprising the steps of:

• obtaining a data sequence having a polarity from a GPS signal;
• performing polarity inversion based on navigation data derived from the GPS signal and calculating a cumulative sum of values at the same bit position in respective blocks each having a length of a C/A code;
• performing a correlation calculation using the C/A code based on a result of the second step;
• determining a correlation peak position based on a correlation peak value obtained as a result of the correlation calculation;
• and
• determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on the correlation peak position;
• wherein
• when the correlation peak value is obtained, the correlation calculation is completed.

A GPS positioning method comprising the steps of:

• obtaining a data sequence having a polarity from a GPS signal;
• receiving information including navigation information from an external apparatus and determining a communication delay in the navigation data based on a time required for communication with the external apparatus;
• performing polarity inversion based on the navigation data shifted by the communication delay and calculating a cumulative sum of values at the same bit position in respective blocks each having a length of a C/A code;
• performing a correlation calculation using the C/A code based on a result of the third step;
• determining a correlation peak position based on a correlation peak value obtained as a result of the correlation calculation;
• and
• determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on the correlation peak position.

A GPS terminal comprising:

• a first Doppler correction unit performing Doppler correction to a GPS signal based on Doppler information derived from the GPS signal and obtaining a data sequence having a polarity;
• a second Doppler correction unit performing Doppler correction to the data sequence based on the Doppler information;
• a data processing unit performing polarity inversion based on navigation data derived from the GPS signal and calculating a cumulative sum of values at the same bit position in respective blocks each having a length of a C/A code;
• a correlation calculation unit performing a correlation calculation using the C/A code based on a result of a process in the data processing unit;
• a pseudo range calculation unit determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on the correlation peak position determined by said correlation calculation unit.

A GPS terminal comprising:

• a data sequence obtaining unit obtaining a data sequence having a polarity from a GPS signal;
• a data dividing unit dividing the data sequence into predetermined sections;
• a data processing unit subjecting the sections obtained by said data dividing unit to polarity inversion based on navigation data derived from the GPS signal, and calculating a cumulative sum of values at the same bit position in the respective blocks each having a length of a C/A code;
• a correlation calculation unit performing correlation calculation using the C/A code based on a result of the process in said data processing unit;
• and
• a pseudo range calculation unit determining a pseudo range between a GPS terminal and a satellite corresponding to the C/A code based on a correlation peak position obtained by said correlation calculation unit for each of the sections.