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US 2014/0368379 A1Published application
Receiver for simultaneous reception of signals from multiple gnss satellite systems
AssigneeSamsung Electronics Co., Ltd.
InventorGary LENNEN
Life of this patent
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Abstract
A method, receiver, and mobile terminal for simultaneously receiving and processing signals of multiple satellites from a plurality of navigational satellite system constellations are described. In the method, satellite signals from a plurality of navigational satellite systems are translated into an intermediate frequency and converted from analog to digital together, but then are separated out according to each navigational satellite system in the digital domain.
Claims26
A method for a receiver in a satellite navigational system to receive signals of multiple satellites from a plurality of satellite system constellations, comprising:
- receiving a radiofrequency (RF) signal comprising transmissions from multiple satellites in the plurality of satellite system constellations;
- translating the RF signal comprising transmissions from the multiple satellites in the plurality of satellite system constellations to an analog intermediate frequency (IF) signal comprising transmissions from the multiple satellites in the plurality of satellite system constellations by mixing the RF signal with a local oscillator-derived signal LORF;
- sampling the IF signal at a sampling rate fs to convert the analog IF signal to a digital IF signal;
- and
- separating out, for each satellite system, signals of satellites of the satellite system from the digital IF signal by mixing the digital IF signal with a numerically-controlled oscillator (NCO) output signal fNCO-GNSS, the NCO output signal fNCO-GNSS having a frequency corresponding to a center of a transmission frequency of the satellites in the satellite system after translation to the IF.
2 more elements
A reception chain in a satellite navigational system receiver, comprising:
- a receiver configured to receive a radio frequency (RF) signal comprising transmissions from multiple satellites in a plurality of satellite system constellations;
- a complex mixer configured to mix the received RF signal with a local oscillator-derived signal LORF, generating an output of an analog intermediate frequency (IF) signal comprising the transmissions from the multiple satellites in the plurality of satellite system constellations;
- an analog-to-digital convertor (ADC) configured to sample the IF signal at a sampling rate fs to convert the analog IF signal to a digital IF signal;
- and
- a complex mixer configured to mix the digital IF signal with a numerically-controlled oscillator (NCO) output signal fNCO-GNSS, the NCO output signal fNCO-GNSS having a frequency corresponding to a center of a transmission frequency at IF of satellites in a target satellite system of the plurality of satellite systems, thereby separating out signals of satellites of the target satellite system from the digital IF signal.
2 more elements
A receiver in a satellite navigational system, comprising:
- one or more processors;
- and
- at least one non-transitory computer-readable medium having program instructions recorded thereon, the program instructions configured to have the one or more processors control performance of one or more steps of:
- receiving a radiofrequency (RF) signal comprising transmissions from multiple satellites in a plurality of satellite system constellations;
- translating the RF signal comprising transmissions from multiple satellites in the plurality of satellite system constellations to an analog intermediate frequency (IF) signal comprising transmissions from the multiple satellites in the plurality of satellite system constellations by mixing the RF signal with a local oscillator-derived signal LORF;
- sampling the IF signal at a sampling rate fs to convert the analog IF signal to a digital IF signal;
- and
- separating out, for each satellite system, signals of satellites of the satellite system from the digital IF signal by mixing the digital IF signal with a numerically-controlled oscillator (NCO) output signal fNCO-GNSS, the NCO output signal fNCO-GNSS having a frequency corresponding to a center of a transmission frequency of the satellites in the satellite system after translation into the IF.
5 more elements
A mobile terminal capable of receiving signals of multiple satellites from a plurality of navigational satellite system constellations, comprising:
- a receiver configured to receive a radiofrequency (RF) signal comprising signals of multiple satellites from the plurality of navigational satellite systems GNSS1-GNSSn;
- a complex mixer configured to mix the received RF signal with a local oscillator-derived signal LORF, generating an output of an analog intermediate frequency (IF) signal comprising the signals of the multiple satellites from the plurality of navigational satellite systems GNSS1-GNSSn;
- an analog-to-digital convertor (ADC) configured to sample the IF signal at a sampling rate fs to convert the analog IF signal to a digital IF signal;
- and
- a plurality of complex mixers, each complex mixer i being configured to mix the digital IF signal with a numerically-controlled oscillator (NCO) output signal fNCO-GNSSi, the NCO output signal fNCO-GNSSi having a frequency corresponding to a center of a transmission frequency at IF of satellites in navigational satellite system GNSSi of the plurality of navigational satellite systems GNSS1-GNSSn, whereby the plurality of complex mixers can separate out signals of satellites in each of the plurality of navigational satellite systems GNSS1-GNSSn from the digital IF signal.
2 more elements
A method for a receiver to receive signals from a plurality of satellite system constellations, comprising:
- selecting a subset GNSSs of one or more satellite system constellations from a set of satellite system constellations GNSS1-GNSSn, wherein the receiver comprises circuitry configured to separate signals from satellites of each of the set of satellite system constellations GNSS1-GNSSn;
- separating out, for each satellite system in the subset GNSSs, signals of satellites of the satellite system from a digital intermediate (IF) signal by mixing the digital IF signal with a numerically-controlled oscillator (NCO) output signal fNCO-GNSS, the NCO output signal fNCO-GNSS having a frequency corresponding to a center of a transmission frequency of the satellites in the satellite system after translation to the IF;
- calculating a navigational/positional solution using the separated out signals;
- and
- when the calculated navigational/positional solution does not meet a minimum threshold, adding one or more previously unselected satellite system constellations from the set of satellite system constellations GNSS1-GNSSn to the subset GNSSs;
- and
- when one or more conditions exceeds a maximum threshold, removing one or more previously selected satellite system constellations from the subset GNSSs.
4 more elements
Dependencies are inferred from the claim text.