Title:
DYNAMIC SWITCHING OF CARRIER TRACKING LOOPS WITHOUT LOSS OF TRACKING INFORMATION
Document Type and Number:
WIPO Patent Application WO2007079282
Kind Code:
A8
Abstract:
A method of dynamic switching of a plurality of carrier loops on a radio receiver, wherein each channel comprises a plurality of carrier tracking loops and wherein each carrier tracking loop is configured to track a radio source. Each carrier tracking loop includes a predetermined accumulation period. The method comprises the following steps: (A) receiving a radio signal (16) from a radio source by using a carrier tracking loop; (B) substantially continuously estimating a signal-to-noise ratio (SNR) of the received radio signal (16) from the radio source; (C) if the signal-to-noise ratio (SNR) of the received radio signal (16) from the radio source is above an initial predetermined threshold, performing carrier tracking loop having an initial accumulation period; and (D) if the signal-to-noise ratio (SNR) of the received radio signal (16) from the radio source falls below the initial predetermined threshold, switching from the initial carrier tracking loop having the initial accumulation period to a subsequent carrier tracking loop having a subsequent accumulation period; and performing carrier tracking of the received carrier signal by the subsequent carrier tracking loop having the subsequent carrier tracking loop having the subsequent accumulation period.
Inventors:
CARTMELL ANDREW PETER JOHN (US)
Application Number:
PCT/US2006/060625
Publication Date:
April 03, 2008
Filing Date:
November 07, 2006
Export Citation:
Assignee:
TRIMBLE NAVIGATION LTD (US)
CARTMELL ANDREW PETER JOHN (US)
CARTMELL ANDREW PETER JOHN (US)
International Classes:
H03D3/18
Download PDF: