# US 8,570,220 B2 · Navigation receiver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,220 B2 - Document ID: US8570220B2 - Status: Granted - Kind: B2 - Application number: 13/276,252 - Filed: 2011-10-18 - Published: 2012-02-09 - Granted: 2013-10-29 - Earliest claimed: 2007-12-20 - Assignees: QUALCOMM Incorporated - Applicants: Liang Zhao; Michael Kohlmann; Paul A. Conflitti; Roger Brockenbrough; Cormac S. Conroy; Leonid Sheynblat; Douglas Rowitch - Inventors: Liang Zhao; Michael Kohlmann; Paul A. Conflitti; Roger Brockenbrough; Cormac S. Conroy; Leonid Sheynblat; Douglas Rowitch - Web page: https://patentgrep.com/patent/US8570220B2 ## CPC - G01S 19/36: relating to the receiver frond end - G01S 19/33: Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS - G01S 19/25: involving aiding data received from a cooperating element, e.g. assisted GPS - G01S 19/32: Multimode operation in a single same satellite system, e.g. GPS L1/L2 - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract The subject matter disclosed herein relates to a system and method for processing navigation signals received from multiple global navigation satellite systems (GNSS′). In a particular implementation, signals received from multiple GNSS′ may be processed in a single receiver channel. ## Claims ### Claim 1 A method comprising: receiving a signal at a single radio frequency (RF) receiver, the signal comprising a plurality of satellite positioning signals; processing the received signal to generate a composite signal comprising at least a first satellite signal component having a first carrier frequency and a second satellite signal component having a second carrier frequency that differs from the first carrier frequency; processing the composite signal to generate at least a separate first satellite signal portion and a separate second satellite signal portion, wherein processing the composite signal comprises: performing analog to digital conversion and complex downconversion of the composite signal. ### Claim 2 (depends on 1) The method of claim 1, wherein performing analog to digital conversion and complex downconversion of the composite signal comprises: performing analog to digital conversion of the composite signal to generate a digitally sampled composite signal; and performing complex downconversion of the digitally sampled composite signal to generate the separate first satellite signal portion and the separate second satellite signal portion. ### Claim 3 (depends on 1) The method of claim 1, wherein processing the received signal to generate a composite signal comprises mixing the received signal with a local oscillator signal having a first phase state. ### Claim 4 (depends on 3) The method of claim 3, wherein mixing the received signal with the local oscillator signal having the first phase state comprises generating an in phase intermediate frequency composite signal. ### Claim 5 (depends on 4) The method of claim 4, further comprising processing the received signal to generate a quadrature intermediate frequency composite signal. ### Claim 6 (depends on 5) The method of claim 5, further comprising performing analog to digital conversion of the quadrature intermediate frequency composite signal to generate a digitally sampled quadrature intermediate frequency composite signal. ### Claim 7 (depends on 6) The method of claim 6, wherein processing the composite signal to generate at least a separate first satellite signal portion and a separate second satellite signal portion comprises performing complex downconversion of the digitally sampled in phase intermediate frequency composite signal and the digitally sampled quadrature intermediate frequency composite signal. ### Claim 8 (depends on 7) The method of claim 7, wherein performing complex downconversion of the digitally sampled in phase intermediate frequency composite signal and the digitally sampled quadrature intermediate frequency composite signal comprises mixing the digitally sampled in phase intermediate frequency composite signal with a local oscillator signal having a first phase state and a local oscillator signal having a second phase state. ### Claim 9 (depends on 7) The method of claim 7, wherein performing complex downconversion of the digitally sampled in phase intermediate frequency composite signal and the digitally sampled quadrature intermediate frequency composite signal comprises mixing the digitally sampled quadrature intermediate frequency composite signal with a local oscillator having a first phase state and a local oscillator signal having a second phase state. ### Claim 10 (depends on 1) The method of claim 1, wherein the separate first satellite signal portion and the separate second satellite signal portion comprise satellite signal portions associated with different satellite processing systems. ### Claim 11 (depends on 1) The method of claim 1, wherein the separate first satellite signal portion and the separate second satellite signal portion both comprise satellite signal portions associate with the same satellite processing system. ### Claim 12 (depends on 11) The method of claim 11, wherein the satellite processing system is a system selected from the group consisting of GPS, Galileo, GLONASS, and Compass. ### Claim 13 (depends on 1) The method of claim 1, wherein processing the composite signal to generate at least the separate first satellite signal portion and the separate second satellite signal portion comprises processing the composite signal to generate more than two separate satellite signal portions. ### Claim 14 (depends on 1) The method of claim 1, wherein the signal comprising a plurality of satellite positioning signals comprises a filtered and amplified signal input signal. ### Claim 15 A satellite positioning receiver comprising: a single radio frequency (RF) receiver to receive a signal comprising a plurality of satellite positioning signals; analog to digital processing circuitry to generate digitally sampled composite satellite positioning signals, the digitally sampled composite satellite positioning signals comprising a plurality of satellite signal components, the plurality of satellite signal components comprising a first satellite signal component having a first carrier frequency and a second satellite signal component having a second carrier frequency that differs from the first carrier frequency; and complex downconversion circuitry to process the digitally sampled composite satellite positioning signals to generate a plurality of separate satellite signal portions. ### Claim 16 (depends on 15) The receiver of claim 15, further comprising mixer circuitry configured to mix the received signal with a local oscillator signal having a first phase state to generate a first intermediate frequency composite signal. ### Claim 17 (depends on 16) The receiver of claim 16, wherein the mixer circuitry comprises a first mixer and a second mixer, and wherein the second mixer is configured to mix the received signal with a local oscillator signal having a second different phase state to generate a second intermediate frequency composite signal. ### Claim 18 (depends on 17) The receiver of claim 17, wherein the first phase state comprises an in phase state, and the first intermediate frequency composite signal comprises and in phase intermediate frequency composite signal. ### Claim 19 (depends on 18) The receiver of claim 18, wherein the second different phase state comprises a quadrature phase state, and the second intermediate frequency composite signal comprises a quadrature intermediate frequency composite signal. ### Claim 20 (depends on 19) The receiver of claim 19, wherein the analog to digital processing circuitry is configured to receive the in phase intermediate frequency composite signal and the quadrature intermediate frequency composite signal and to generate a digitally sampled in phase composite signal and a digitally sampled quadrature composite signal. ### Claim 21 (depends on 20) The receiver of claim 20, wherein the complex downconversion circuitry is configured to process the digitally sampled in phase composite signal and the digitally sampled quadrature composite signal to generate the plurality of separate satellite signal portions. ### Claim 22 (depends on 21) The receiver of claim 21, wherein the complex downconversion circuitry comprises mixer circuitry to mix the digitally sampled in phase composite signal with a local oscillator signal having a first phase state and to mix the digitally sampled quadrature composite signal with a local oscillator signal having a second different phase state. ### Claim 23 (depends on 22) The receiver of claim 22, wherein the mixer circuitry comprises a first mixer to mix the digitally sampled in phase composite signal with an in phase local oscillator signal, a second mixer to mix the digitally sampled in phase composite signal with a quadrature local oscillator signal, a third mixer to mix the digitally sampled quadrature composite signal with an in phase local oscillator signal, and a fourth mixer to mix the digitally sampled quadrature composite signal with a quadrature local oscillator signal. ### Claim 24 (depends on 22) The receiver of claim 22, wherein the complex downconversion circuitry further comprises a plurality of combiner units each configured to receive a plurality of signals from the mixer circuitry and to output the plurality of separate satellite signal portions. ### Claim 25 (depends on 15) The receiver of claim 15, further comprising satellite signal processing units, each of the satellite signal processing units configured to process different separate satellite signal portions. ### Claim 26 (depends on 25) The receiver of claim 25, wherein a first satellite signal processing unit is configured to process an in phase separate satellite signal portion and a quadrature separate satellite signal portion from a first positioning satellite system and wherein a second satellite signal processing unit is configured to process an in phase separate satellite signal portion and a quadrature separate satellite signal portion from a second positioning satellite system. ### Claim 27 (depends on 26) The receiver of claim 26, wherein the first positioning satellite system is selected from the group consisting of GPS, GLONASS, Galileo, and Compass. ### Claim 28 A satellite positioning receiver comprising: means for receiving a signal at a single radio frequency (RF) receiver, the signal comprising a plurality of satellite positioning signals; means for processing the received signal to generate a composite signal comprising at least a first satellite signal component having a first carrier frequency and a second satellite signal component having a second carrier frequency that differs from the first carrier frequency; means for processing the composite signal to generate at least a separate first satellite signal portion and a separate second satellite signal portion, wherein processing the composite signal comprises: means for performing analog to digital conversion and complex downconversion of the composite signal. ### Claim 29 (depends on 28) The receiver of claim 28, wherein the means for performing analog to digital conversion and complex downconversion of the composite signal comprises: means for performing analog to digital conversion of the composite signal to generate a digitally sampled composite signal; and means for performing complex downconversion of the digitally sampled composite signal to generate the separate first satellite signal portion and the separate second satellite signal portion. ### Claim 30 (depends on 28) The receiver of claim 28, wherein the means for processing the received signal to generate a composite signal comprises means for mixing the received signal with a local oscillator signal having a first phase state. ### Claim 31 (depends on 30) The receiver of claim 30, wherein the means for mixing the received signal with the local oscillator signal having the first phase state comprises means for generating an in phase intermediate frequency composite signal. ### Claim 32 (depends on 31) The receiver of claim 31, further comprising means for processing the received signal to generate a quadrature intermediate frequency composite signal. ### Claim 33 (depends on 32) The receiver of claim 32, further comprising means for performing analog to digital conversion of the quadrature intermediate frequency composite signal to generate a digitally sampled quadrature intermediate frequency composite signal. ### Claim 34 (depends on 33) The receiver of claim 33, wherein the means for processing the composite signal to generate at least a separate first satellite signal portion and a separate second satellite signal portion comprises means for performing complex downconversion of the digitally sampled in phase intermediate frequency composite signal and the digitally sampled quadrature intermediate frequency composite signal. ### Claim 35 (depends on 34) The receiver of claim 34, wherein the means for performing complex downconversion of the digitally sampled in phase intermediate frequency composite signal and the digitally sampled quadrature intermediate frequency composite signal comprises means for mixing the digitally sampled in phase intermediate frequency composite signal with a local oscillator signal having a first phase state and a local oscillator signal having a second phase state. ### Claim 36 (depends on 34) The receiver of claim 34, wherein the means for performing complex downconversion of the digitally sampled in phase intermediate frequency composite signal and the digitally sampled quadrature intermediate frequency composite signal comprises means for mixing the digitally sampled quadrature intermediate frequency composite signal with a local oscillator having a first phase state and a local oscillator signal having a second phase state. ### Claim 37 (depends on 28) The receiver of claim 28, wherein the separate first satellite signal portion and the separate second satellite signal portion comprise satellite signal portions associated with different satellite positioning systems. ### Claim 38 (depends on 28) The receiver of claim 28, wherein the separate first satellite signal portion and the separate second satellite signal portion both comprise satellite signal portions associate with the same satellite positioning system. ### Claim 39 (depends on 38) The receiver of claim 38, wherein the satellite positioning system is a system selected from the group consisting of GPS, Galileo, GLONASS, and Compass. ### Claim 40 (depends on 28) The receiver of claim 28, wherein processing the composite signal to generate at least the separate first satellite signal portion and the separate second satellite signal portion comprises processing the composite signal to generate more than two separate satellite signal portions. ### Claim 41 (depends on 28) The receiver of claim 28, wherein the signal comprising a plurality of satellite positioning signals comprises a filtered and amplified signal input signal.