Title:
【発明の名称】マルチビット相関器を備えたスペクトル拡散受信機
Document Type and Number:
Japanese Patent JP2002500751
Kind Code:
A
Abstract:
A terrestrial C/A code GPS receiver system digitally samples, filters and stores a segment of 11 half chips of the received composite as a binary number and multiplexes this number for parallel correlation with each of a series of multibit code replicas for the satellites to be tracked. Each of the time delay specific correlation products are accumulated in a cell of a memory matrix so that at least twenty-two delays for each satellite may be evaluated each code period providing fast reacquisition even within a city intersection, as well as correction of multipath tracking and multipath interference. All cells of the memory matrix may be used for an acquisition of a single satellite in about 4 ms. Two satellite tracking, in addition to altitude hold, uses cross-track hold alternating with clock hold to update the cross-track estimate. Single satellite tracking uses cross-track and clock hold together. Navigation data is updated with detected changes in motion including turns.
Inventors:
Sanjay, Kori
Steven, Chen
Charles Earl Khan
Mandish, Chansaker
Greg, Turret Sky
Steven, Chen
Charles Earl Khan
Mandish, Chansaker
Greg, Turret Sky
Application Number:
JP53835297A
Publication Date:
January 08, 2002
Filing Date:
April 25, 1997
Export Citation:
Assignee:
SIRF TECHNOLOGY,INC.
International Classes:
G01C21/26; G01C22/00; G01S1/00; G01S19/22; G01S19/29; G01S19/30; G01S19/37; G01S19/47; H04B1/707; H04B7/216; G01S19/11; G01S19/23; G01S19/34; (IPC1-7): G01S5/14; H04B1/707
Attorney, Agent or Firm:
Kazuo Sato (3 others)