US 7,450,061 B2
Relative position measurement system using satellite
Yukihiro Terada, Osaka (Japan); Keiji Ito, Osaka (Japan); Takenori Abe, Osaka (Japan); and Takashi Fujita, Osaka (Japan)
Assigned to Hitachi Zosen Corporation, (Japan)
Appl. No. 11/666,255
PCT Filed Nov. 10, 2004, PCT No. PCT/JP2004/016650
§ 371(c)(1), (2), (4) Date Apr. 25, 2007,
PCT Pub. No. WO2006/051582, PCT Pub. Date May 18, 2006.
Prior Publication US 2008/0143592 A1, Jun. 19, 2008
Int. Cl. G01S 5/00 (2006.01)
U.S. Cl. 342—357.08  [342/357.17; 181/112] 6 Claims
OG exemplary drawing
 
1. A relative position measurement system for measuring displacement of an observation station viewed from a reference station by receiving radio waves from satellites by the reference station and the observation station and performing relative position measurement between said stations, comprising:
a short period displacement measurement section for measuring a short period displacement component in each of said stations through independent position measurement;
a relative position computing section for performing relative position measurement between said stations;
a long period position computing section for inputting a short period displacement component measured by said short period displacement measurement section and a relative position determined by said relative position computing section, and determining a relative position including a long period displacement component by removing the short period displacement component from the relative position; and
a radio communication device installed in each of said stations, for transmitting/receiving data to/from another station.