METHOD AND APPARATUS FOR RECEIVING NAVIGATION SATELLITE SIGNALS FROM TWO BANDS
First Claim
1. A method in a mobile device to multiplex two global navigation satellite system (GNSS) signals on a single hardware receiver chain, the method comprising:
- generating a control signal indicating a first GNSS signal on a first band during a first period and a second GNSS signal on a second band during a second period;
generating a first oscillator signal from a local oscillator (LO) during the first period and a second oscillator signal from the LO during the second period based on the control signal;
mixing, during the first period, the first GNSS signal from an antenna with the first oscillator signal to result in a first down converted signal;
mixing, during the second period, the second GNSS signal from the antenna with the second oscillator signal to result in a second down converted signal;
de-multiplexing the first down converted signal during the first period and the second down converted signal during the second period based on the control signal;
demodulating, during the first period, the first down converted signal; and
demodulating, during the second period, the second down converted signal;
wherein the first oscillator signal and the second oscillator signal comprise different frequencies.
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Abstract
Systems, apparatus and methods in a mobile device to multiplex two global navigation satellite system (GNSS) signals on a single hardware receiver chain are presented. The GNSS signals may come from a common GNSS system on two bands of two different GNSS systems overlapping on a common band. A duty cycle of the GNSS signals may be based on a harmonic being within one of the first band and the second band. The duty cycle may be based on signal quality, such as indicating a jammed or non jammed signal. The duty cycle may be of unequal proportions and less than 100% such that the receiver chain is idle for a percentage of time.
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Citations
26 Claims
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1. A method in a mobile device to multiplex two global navigation satellite system (GNSS) signals on a single hardware receiver chain, the method comprising:
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generating a control signal indicating a first GNSS signal on a first band during a first period and a second GNSS signal on a second band during a second period; generating a first oscillator signal from a local oscillator (LO) during the first period and a second oscillator signal from the LO during the second period based on the control signal; mixing, during the first period, the first GNSS signal from an antenna with the first oscillator signal to result in a first down converted signal; mixing, during the second period, the second GNSS signal from the antenna with the second oscillator signal to result in a second down converted signal; de-multiplexing the first down converted signal during the first period and the second down converted signal during the second period based on the control signal; demodulating, during the first period, the first down converted signal; and demodulating, during the second period, the second down converted signal; wherein the first oscillator signal and the second oscillator signal comprise different frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A mobile device to multiplex two global navigation satellite system (GNSS) signals on a single hardware receiver chain, the mobile device comprising:
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a controller configured to provide a control signal indicating a first GNSS signal on a first band during a first period and a second GNSS signal on a second band during a second period; a local oscillator (LO) coupled to the controller, and configured to receive the control signal and to provide a first oscillator signal during the first period and a second oscillator signal during the second period, wherein the first oscillator signal and the second oscillator signal comprise different frequencies; a mixer with inputs coupled to the LO and to an antenna, the mixer configured to generate a first down converted signal during the first period and generate a second down converted signal during the second period; and a de-multiplexer coupled to the mixer and configured to separate the first down converted signal during the first period from the second down converted signal during the second period based on the control signal; and a demodulator coupled to the de-multiplexer and configured to demodulate the first down converted signal during the first period and demodulate the second down converted signal during the second period. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A mobile device to multiplex two global navigation satellite system (GNSS) signals on a single hardware receiver chain, the mobile device comprising:
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means for generating a control signal indicating a first GNSS signal on a first band during a first period and a second GNSS signal on a second band during a second period; means for generating a first oscillator signal from a local oscillator (LO) during the first period and a second oscillator signal from the LO during the second period based on the control signal; means for mixing, during the first period, the first GNSS signal from an antenna with the first oscillator signal to result in a first down converted signal; means for mixing, during the second period, the second GNSS signal from the antenna with the second oscillator signal to result in a second down converted signal; means for de-multiplexing the first down converted signal during the first period and the second down converted signal during the second period based on the control signal; means for demodulating, during the first period, the first down converted signal; and means for demodulating, during the second period, the second down converted signal; wherein the first oscillator signal and the second oscillator signal comprise different frequencies. - View Dependent Claims (23, 24, 25, 26)
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Specification