Phase compensation system and method to correct M-code dual sideband distortion
First Claim
Patent Images
1. A method of generating a position, comprising:
- receiving from a transmitter a binary offset carrier (BOC) signal, the BOC signal including an upper sideband signal and a lower sideband signal;
down converting the received BOC signal to a baseband signal by using filters, the filters lacking linear phase response across a pass-band;
correlating the BOC signal with a first replica signal and a second replica signal, the first replica signal and the second replica signal being square wave signals, the first replica signal being a BOCSINE replica signal, the second replica signal being a BOCCOS replica signal, the BOCSINE replica signal being ninety degrees out-of-phase relative to the BOCCOS replica signal, wherein correlating provides a plurality of correlator outputs, the plurality of correlator outputs including a BOCSINE correlator output and a BOCCOS correlator output, the BOCSINE correlator output being ninety degrees out-of-phase relative to the BOCCOS correlator output; and
processing the converted baseband signal to remove errors due to phase distortion of the BOC signal, wherein the processing includes applying a complex rotation to a combination of the BOCSINE correlator output and the BOCCOS correlator output, the complex rotation correcting for a non-linear component of a phase response of a processing channel, the processing channel having a non-linear phase, said processing being carried out at a post detection integration (PDI) rate.
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Abstract
A system and method of generating a position is disclosed. The system and method are configured for receiving from a transmitter an M-code signal, the M-code signal modulated with a pseudorandom number sequence. The system and method are also configured for down converting the received M-code signal to a baseband signal. Further, the system and method are configured for correlating the baseband signal with a known pseudorandom number sequence. Further still, the system and method are configured for processing the converted baseband signal to remove errors due to phase distortion of the M-code signal.
28 Citations
13 Claims
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1. A method of generating a position, comprising:
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receiving from a transmitter a binary offset carrier (BOC) signal, the BOC signal including an upper sideband signal and a lower sideband signal; down converting the received BOC signal to a baseband signal by using filters, the filters lacking linear phase response across a pass-band; correlating the BOC signal with a first replica signal and a second replica signal, the first replica signal and the second replica signal being square wave signals, the first replica signal being a BOCSINE replica signal, the second replica signal being a BOCCOS replica signal, the BOCSINE replica signal being ninety degrees out-of-phase relative to the BOCCOS replica signal, wherein correlating provides a plurality of correlator outputs, the plurality of correlator outputs including a BOCSINE correlator output and a BOCCOS correlator output, the BOCSINE correlator output being ninety degrees out-of-phase relative to the BOCCOS correlator output; and processing the converted baseband signal to remove errors due to phase distortion of the BOC signal, wherein the processing includes applying a complex rotation to a combination of the BOCSINE correlator output and the BOCCOS correlator output, the complex rotation correcting for a non-linear component of a phase response of a processing channel, the processing channel having a non-linear phase, said processing being carried out at a post detection integration (PDI) rate. - View Dependent Claims (2, 3, 4, 5)
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6. A method of generating a position, comprising:
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receiving from a transmitter an M-code signal, the M-code signal modulated with a pseudorandom number sequence, the M-code signal including an upper sideband signal and a lower sideband signal; down converting the received M-code signal to a baseband signal by using filters, the filters lacking linear phase response across a pass-band; correlating the baseband signal with a first replica signal and a second replica signal, the first replica signal and the second replica signal being square wave signals, the first replica signal being a BOCSINE replica signal, the second replica signal being a BOCCOS replica signal, the BOCSINE replica signal being ninety degrees out-of-phase relative to the BOCCOS replica signal, wherein correlating provides a plurality of correlator outputs, the plurality of correlator outputs including a BOCSINE correlator output and a BOCCOS correlator output, the BOCSINE correlator output being ninety degrees out-of-phase relative to the BOCCOS correlator output; and processing the converted baseband signal to remove errors due to phase distortion of the M-code signal, wherein the processing includes applying a complex rotation to a combination of the BOCSINE correlator output and the BOCCOS correlator output, the complex rotation correcting for a non-linear component of a phase response of a processing channel, the processing channel having a non-linear phase, said processing being carried out at a post detection integration (PDI) rate. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An apparatus for generating a position, comprising:
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means for receiving from a transmitter an M-code signal, the M-code signal modulated with a pseudorandom number sequence, the M-code signal including an upper sideband signal and a lower sideband signal; means for down converting the received M-code signal to a baseband signal by using filters, the filters lacking linear phase response across a pass-band; means for correlating the baseband signal with a first replica signal and a second replica signal, the first replica signal and the second replica signal being square wave signals, the first replica signal being a BOCSINE replica signal, the second replica signal being a BOCCOS replica signal, the BOCSINE replica signal being ninety degrees out-of-phase relative to the BOCCOS replica signal, wherein correlating provides a plurality of correlator outputs, the plurality of correlator outputs including a BOCSINE correlator output and a BOCCOS correlator output, the BOCSINE correlator output being ninety degrees out-of-phase relative to the BOCCOS correlator output; and means for processing the converted baseband signal to remove errors due to phase distortion of the M-code signal, wherein the correlation is accomplished by applying a complex rotation to a combination of the BOCSINE correlator output and the BOCCOS correlator output, the complex rotation correcting for a non-linear component of a phase response of a processing channel, the processing channel having a non-linear phase, said processing being carried out at a post detection integration (PDI) rate. - View Dependent Claims (13)
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Specification