Information processing apparatus and GPS positioning method

Abstract

A composite integrated semiconductor device. In one embodiment, an input surge/noise absorbing circuit absorbs surge from an input signal, an attenuating/level-shifting circuit attenuates or level-shifts the input signal, and an electrical signal converting circuit converts the input signal to an output signal. The input surge/noise absorbing circuit, the attenuating or level-shifting circuit, and the electrical signal converting circuit together form a unit, and a plurality of these units are arranged in parallel in one semiconductor substrate to form the composite integrated semiconductor device, resulting in a reduction in the number of discrete components mounted on a printed circuit board.

1 . An information processing apparatus for measuring a current position by using a radio wave from a single GPS satellite, comprising: 
 a Doppler shift measurement unit obtaining a Doppler shift in a frequency of the radio wave from the satellite;    a distance measurement unit obtaining a pseudo-distance between the satellite and a measuring point by using a signal from the satellite; and    an arithmetic calculation unit calculating a position of the measuring point by using the Doppler shift combined with the pseudo-distance, thereby obtaining the position of the measuring point with high precision using only the single GPS satellite when a clock of the satellite is synchronous with a clock of the information processing apparatus.    
     
     
         2 . The information processing apparatus according to  claim 1 , further comprising 
 a data acquisition unit acquiring navigation data of the satellite,    wherein said arithmetic calculation unit obtains a position of the satellite and a relative velocity between the measuring point and the satellite from the navigation data, and calculates the position of the measuring point by using the obtained position and relative velocity of the satellite, the Doppler shift and the pseudo-distance.    
     
     
         3 . The information processing apparatus according to  claim 2 , wherein said arithmetic calculation unit calculates the position of said measuring point by using an algorithm derived from a Lorentz transformation effect and a Galilean transformation effect including calculations of: a conical surface where the same Doppler shift as said measuring point is observed; a spherical surface whose radius equals a distance between the satellite and the measuring point; and an earth surface.  
     
     
         4 . The information processing apparatus according to  claim 3 , wherein said arithmetic calculation unit obtains two positions of said measuring point by using the algorithm derived from the Lorentz transformation effect and the Galilean transformation effect, and selects one of the two positions by using global positional information of the measuring point.  
     
     
         5 . The information processing apparatus according to  claim 2 , wherein said arithmetic calculation unit calculates the position of said measuring point by using said pseudo-distance as an actual distance between said satellite and the measuring point after a clock of the satellite synchronizes with a clock of said information processing apparatus.  
     
     
         6 . A storage medium storing a program for use in an information processing apparatus for measuring a current position by using a radio wave from a single GPS satellite, wherein the program enables the information processing apparatus to perform: 
 obtaining a Doppler shift in a frequency of the radio wave from the satellite;    obtaining a pseudo-distance between the satellite and a measuring point by using a signal from the satellite; and    calculating a position of the measuring point by using the Doppler shift combined with the pseudo-distance, thereby obtaining the position of the measuring point with high precision using only the single GPS satellite when a clock of the satellite is synchronous with a clock of the information processing apparatus.    
     
     
         7 . The storage medium according to  claim 6 , wherein said program further enables said information processing apparatus to perform 
 obtaining navigation data of the satellite,    wherein said calculating obtains a position of the satellite and a relative velocity between the measuring point and the satellite from the navigation data, and calculates the position of the measuring point by using the obtained position and relative velocity of the satellite, the Doppler shift and the pseudo-distance.    
     
     
         8 . The storage medium according to  claim 7 , wherein said information processing apparatus calculates the position of said measuring point by using an algorithm derived from a Lorentz transformation effect and a Galilean transformation effect including calculations of: a conical surface where the same Doppler shift as said measuring point is observed; a spherical surface whose radius equals a distance between the satellite and the measuring point; and an earth surface.  
     
     
         9 . The storage medium according to  claim 8 , wherein said information processing apparatus obtains two positions of said measuring point by using the algorithm derived from the Lorentz transformation effect and the Galilean transformation effect, and selects one of the two positions by using global positional information of the measuring point.  
     
     
         10 . The storage medium according to  claim 7 , wherein said information processing apparatus calculates the position of said measuring point by using said pseudo-distance as an actual distance between said satellite and the measuring point after a clock of the satellite synchronizes with a clock of said information processing apparatus.  
     
     
         11 . An information processing apparatus for measuring a current position by using a radio wave from a GPS satellite, comprising: 
 a Doppler shift measurement unit obtaining a Doppler shift in a frequency of the radio wave from the satellite;    a distance measurement unit obtaining a pseudo-distance between the satellite and a measuring point by using a signal from the satellite;    an arithmetic calculation unit calculating a position of the measuring point by using the Doppler shift combined with the pseudo-distance; and    a data acquisition unit acquiring navigation data of the satellite,    wherein said arithmetic calculation unit obtains a position of the satellite and a relative velocity between the measuring point and the satellite from the navigation data, and calculates the position of the measuring point by using the obtained position and relative velocity of the satellite, the Doppler shift and the pseudo-distance, and    wherein said arithmetic calculation unit calculates the position of said measuring point by using an algorithm derived from a Lorentz transformation effect and a Galilean transformation effect including calculations of: a conical surface where the same Doppler shift as said measuring point is observed; a spherical surface whose radius equals a distance between the satellite and the measuring point; and an earth surface.    
     
     
         12 . The information processing apparatus according to  claim 11 , wherein said arithmetic calculation unit obtains two positions of said measuring point by using the algorithm derived from the Lorentz transformation effect and the Galilean transformation effect, and selects one of the two positions by using global positional information of the measuring point.  
     
     
         13 . A storage medium storing a program for use in an information processing apparatus for measuring a current position by using a radio wave from a GPS satellite, wherein the program enables the information processing apparatus to perform: 
 obtaining a Doppler shift in a frequency of the radio wave from the satellite;    obtaining a pseudo-distance between the satellite and a measuring point by using a signal from the satellite;    calculating a position of the measuring point by using the Doppler shift combined with the pseudo-distance; and    obtaining navigation data of the satellite,    wherein said calculating obtains a position of the satellite and a relative velocity between the measuring point and the satellite from the navigation data, and calculates the position of the measuring point by using the obtained position and relative velocity of the satellite, the Doppler shift and the pseudo-distance, and    wherein said information processing apparatus calculates the position of said measuring point by using an algorithm derived from a Lorentz transformation effect and a Galilean transformation effect including calculations of: a conical surface where the same Doppler shift as said measuring point is observed; a spherical surface whose radius equals a distance between the satellite and the measuring point; and an earth surface.    
     
     
         14 . The storage medium according to  claim 13 , wherein said information processing apparatus obtains two positions of said measuring point by using the algorithm derived from the Lorentz transformation effect and the Galilean transformation effect, and selects one of the two positions by using global positional information of the measuring point.