Title:
【発明の名称】マルチパス補正付き階層的遅延ループロックコード追跡システム
Document Type and Number:
Japanese Patent JP2003523522
Kind Code:
A
Abstract:
A receiver of signals modulated by pseudorandom noise that uses a hierarchy of delay lock loops (DLLs) to maintain code lock. Each DLL in the hierarchy produces a control signal representative of a timing mismatch between the incoming signal and an internally generated pseudorandom noise code, preferably by correlating the incoming signal with early and late instances of the code and subtracting the late correlation from the early correlation. The early correlation is advanced relative to the late correlation by successively shorter spacings in successively lower DLLs in the hierarchy. In each DLL, the control signal is transformed to a code phase signal for adjusting the timing of the code generator. In the lower DLLs, this code phase signal is compared to the delay signal of the immediately higher DLL and adjusted accordingly. This receiver combines the immunity to random noise, associated with short spacings between the early and late correlations, with the immunity to sudden receiver motion associated with long spacings. Multipath error is accounted for by extrapolating the code phase signals to zero spacing between the early and late correlations.
Inventors:
Morev Steimann Arkadi
Application Number:
JP2001560705A
Publication Date:
August 05, 2003
Filing Date:
January 19, 2001
Export Citation:
Assignee:
Infineon Technologies AG
International Classes:
G01S1/00; G01S19/22; G01S19/30; H03L7/081; H04B1/707; (IPC1-7): G01S5/14; H03L7/081
Attorney, Agent or Firm:
Suzuki Hitoshi