Navigation satellite system reception device, method for processing navigation satellite signal from same, and program

Abstract

A navigation satellite system reception apparatus including a satellite orbit information acquisition unit that acquires orbit information of a navigation satellite, an installation position information acquisition unit that acquires position information of an installation position, an azimuth meter that acquires azimuth information of an azimuth in which a wall surface of a nearby obstruction extends, and an azimuth mask generation unit that calculates a mask region for selecting a navigation satellite to be a target of processing based on the azimuth information. A positioning and time synchronization processing unit calculates an azimuth and an angle of elevation of each navigation satellite based on the orbit information and the position information, selects a navigation satellite to be a target of processing, and performs at least one of the positioning processing or the time synchronization processing based on a received navigation satellite signal.

1 . A navigation satellite system reception apparatus for performing at least one of positioning processing or time synchronization processing with a navigation satellite based on a navigation satellite signal received from a plurality of navigation satellites, the navigation satellite system reception apparatus comprising:
 an orbit information acquisition unit configured to acquire orbit information of a navigation satellite of the plurality of navigation satellites;   a position information acquisition unit configured to acquire position information of an installation position of the navigation satellite system reception apparatus;   an azimuth information acquisition unit configured to acquire azimuth information of an azimuth in which a wall surface of an obstruction present adjacent to the navigation satellite system reception apparatus extends;   a mask region calculating unit configured to calculate a mask region for selecting a navigation satellite of the plurality of navigation satellites to be a target of processing in the positioning processing or the time synchronization processing, based on the azimuth information; and   a navigation satellite signal processing unit configured to:
 calculate an azimuth and an angle of elevation of each of the plurality of navigation satellites with reference to the navigation satellite system reception apparatus based on the orbit information and the position information; 
 select a navigation satellite of the plurality of navigation satellites to be a target of processing based on the azimuth and the angle of elevation that are respectively calculated and the mask region; and 
 perform at least one of the positioning processing or the time synchronization processing based on a navigation satellite signal received from the navigation satellite that is selected. 
   
     
     
         2 . The navigation satellite system reception apparatus according to  claim 1 , wherein
 the mask region is identical to or is included in a region on a side opposite to a region in an azimuth toward an open space side with respect to the wall surface of the obstruction with a boundary being both azimuths perpendicular to the azimuth toward the open space side with respect to the wall surface of the obstruction in polar coordinates with a center being the installation position of the navigation satellite system reception apparatus.   
     
     
         3 . The navigation satellite system reception apparatus according to  claim 1 , wherein
 the mask region includes a boundary being defined by a threshold with respect to at least an azimuth in polar coordinates with a center being the installation position of the navigation satellite system reception apparatus.   
     
     
         4 . The navigation satellite system reception apparatus according to  claim 3 , wherein
 the mask region includes a boundary being defined by a threshold with respect to an angle of elevation in polar coordinates with a center being the installation position of the navigation satellite system reception apparatus.   
     
     
         5 . The navigation satellite system reception apparatus according to  claim 1 , wherein
 the azimuth information acquisition unit includes an azimuth meter installed toward a predetermined azimuth with respect to the wall surface of the obstruction.   
     
     
         6 . The navigation satellite system reception apparatus according to  claim 5 , wherein
 the azimuth information acquisition unit includes a support base for supporting an antenna of the navigation satellite system reception apparatus, and the azimuth meter is provided at the support base.   
     
     
         7 . A navigation satellite signal processing method used in a navigation satellite system reception apparatus for performing at least one of positioning processing or time synchronization processing with a navigation satellite based on a navigation satellite signal received from a plurality of navigation satellites, the navigation satellite signal processing method comprising the steps of:
 by an orbit information acquisition unit, acquiring orbit information of a navigation satellite of the plurality of navigation satellites;   by a position information acquisition unit, acquiring position information of an installation position of the navigation satellite system reception apparatus;   by an azimuth information acquisition unit, acquiring azimuth information of an azimuth in which a wall surface of an obstruction present adjacent to the navigation satellite system reception apparatus extends;   by a mask region calculating unit, calculating a mask region for selecting a navigation satellite of the plurality of navigation satellites to be a target of processing in the positioning processing or the time synchronization processing, based on the azimuth information; and   by a navigation satellite signal processing unit:
 calculating an azimuth and an angle of elevation of each of the plurality of navigation satellites with reference to the navigation satellite system reception apparatus based on the orbit information and the position information; 
 selecting a navigation satellite of the plurality of navigation satellites to be a target of processing based on the azimuth and the angle of elevation that are respectively calculated and the mask region; and 
 performing at least one of the positioning processing or the time synchronization processing based on a navigation satellite signal received from the navigation satellite that is selected. 
   
     
     
         8 . A navigation satellite signal processing program for a navigation satellite system reception apparatus, the navigation satellite signal processing program causing a computer to operate as an orbit information acquisition unit, a position information acquisition unit, a mask region calculating unit, and a navigation satellite signal processing unit wherein:
 the orbit information acquisition unit is configured to acquire orbit information of a navigation satellite of the plurality of navigation satellites;   the position information acquisition unit is configured to acquire position information of an installation position of the navigation satellite system reception apparatus;   the azimuth information acquisition unit is configured to acquire azimuth information of an azimuth in which a wall surface of an obstruction present adjacent to the navigation satellite system reception apparatus extends;   the mask region calculating unit is configured to calculate a mask region for selecting a navigation satellite of the plurality of navigation satellites to be a target of processing in the positioning processing or the time synchronization processing, based on the azimuth information; and   the navigation satellite signal processing unit configured to:
 calculate an azimuth and an angle of elevation of each of the plurality of navigation satellites with reference to the navigation satellite system reception apparatus based on the orbit information and the position information; 
 select a navigation satellite of the plurality of navigation satellites to be a target of processing based on the azimuth and the angle of elevation that are respectively calculated and the mask region; and 
 perform at least one of the positioning processing or the time synchronization processing based on a navigation satellite signal received from the navigation satellite that is selected.