Binary offset carrier (boc) sideband processing
AssigneeThe Aerospace Corporation
InventorsJohn M. GEVARGIZ, Che-i LIEN, Richard T. SHARPE
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Abstract
A global positioning system (GPS) receiver configured to perform binary offset carrier (BOC) sideband processing. The GPS receiver includes an analog RF subsystem and a digital subsystem and software module. The analog radio frequency (RF) subsystem is configured to acquire a BOC signal from a GPS satellite and converts the BOC signal to a based-banded signal. The digital subsystem and software module is configured to generate another signal and a local replica signal of the other signal to improve code tracking loop performance of the GPS receiver.
Claims31
A global positioning system (GPS) receiver configured to perform binary offset carrier (BOC) sideband processing, comprising:
- an analog radio frequency (RF) subsystem configured to acquire a BOC signal from a GPS satellite and converts the BOC signal to a based-banded signal;
- and
- a digital subsystem and software module configured to
- up converts a lower-sideband of the base-banded signal and down converts an upper-sideband of the base-banded signal, and
- combine the up converted lower-sideband of the base-banded signal and the down converted upper-sideband of the base-banded signal to generate a signal.
A global positioning system (GPS) receiver configured to perform binary offset carrier (BOC) sideband processing, comprising:
- an analog radio frequency (RF) subsystem configured to acquire a BOC signal from a GPS satellite and converts the BOC signal to a based-banded signal;
- and
- a digital subsystem and software module configured to generate another signal and a local replica signal of the other signal to improve code tracking loop performance of the GPS receiver.
The GPS receiver of claim 21, wherein the BOC sideband processor is further configured to use a subcarrier tracking loop to adjust a local reference for ionospheric corrections, doppler and dynamics,
- wherein the local reference for the up conversion of the lower sideband and the local reference for the down conversion of the upper sideband to baseband is given by:
- e
- +
- j
-
- 2
-
- π
-
- F
- sc
-
- t
- -
- π
- 2
- +
- e
-
- (
- t
- )
- e
- -
- j
-
- 2
-
- π
-
- F
- sc
-
- t
- +
- π
- 2
- +
- e
-
- (
- t
- )
- where Fsc is the subcarrier frequency and e(t) is the residual error that is tracked out by the subcarrier tracking loop.
A method for performing binary offset carrier (BOC) sideband processing, comprising:
- acquiring, by an analog radio frequency (RF) subsystem, a BOC signal from a global positioning system (GPS) satellite and converting the BOC signal to a based-banded signal;
- and
- up converting, by a digital subsystem and software module, a lower-sideband of the base-banded signal and down converts an upper-sideband of the base-banded signal;
- and
- combining, by the digital subsystem and software module, the up converted lower-sideband of the base-banded signal and the down converted upper-sideband of the base-banded signal to generate a signal.
Dependencies are inferred from the claim text.