RECEIVER FOR RECEIVING A PLURALITY OF GNSS (GLOBAL NAVIGATION SATELLITE SYSTEM) SIGNALS
First Claim
1. A receiver arranged to receive a plurality of Global Navigation Satellite System (GNSS) signals of different types, each type of said plurality of GNSS signals arranged according to a different global navigation standard, said receiver comprising:
- a radio frequency (RF) section, said radio frequency section including;
at least one mixer arranged to receive said plurality of GNSS signals and arranged to receive at least one local frequency signal, said at least one mixer further arranged to generate a plurality of mixed signals, each of the plurality of mixed signals corresponding to one of the plurality of GNSS signals, the plurality of mixed signals including at least a first mixed signal derived from a first GNSS signal of a first type and a second mixed signal derived from a second GNSS signal of a second type; and
a low intermediate frequency (IF) section electrically coupled to said at least one mixer, said low IF section including;
a plurality of branches configured to process said plurality of mixed signals, said plurality of branches electrically coupled in parallel downstream of said at least one mixer, said plurality of branches including;
a first branch to process said first mixed signal, said first branch including an image rejection filter and at least one second mixer, said image rejection filter configured to reject an image signal of the first mixed signal and said at least one second mixer configured to mix an output signal from said image rejection filter with a second local frequency signal to derive a first remixed signal; and
a bypass branch electrically coupled upstream said image rejection filter and downstream said at least one second mixer, said bypass branch including an adjustment module configured to adjust said second mixed signal to overlap a band of an adjusted second mixed signal with a band of said first remixed signal; and
a low IF filter electrically coupled downstream said bypass branch and said at least one second mixer, said low IF filter configured to band pass filter said first remixed signal and said adjusted second mixed signal.
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Accused Products
Abstract
A receiver is arranged to receive a plurality of Global Navigation Satellite System (GNSS) signals from up to four different satellite navigation systems including a GLONASS system, a BeiDou system, a GPS system, and a Galileo system. Received GNSS signals are mixed with a first local frequency signal to generate a plurality of mixed signals. The mixed signals are processed in up to three parallel branches. In a first branch, a first portion of the mixed signals are transformed by passing the first portion through a band-pass filter having a bandwidth between about 0 MHz and 46 MHz and by amplifying the filtered signals with an AGC circuit. In a second branch, a second portion of the mixed signals are transformed by rejecting image signals of the second portion with an image rejection filter and mixing image rejection filter output signals with a second local frequency signal to derive first remixed signals. In a third branch, a third portion of the mixed signals are transformed by adjusting a phase of the third portion to overlap a band of the first remixed signals. The adjusted third portion of the mixed signals and the first remixed signals are concurrently band pass filtered with a low IF filter.
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Citations
20 Claims
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1. A receiver arranged to receive a plurality of Global Navigation Satellite System (GNSS) signals of different types, each type of said plurality of GNSS signals arranged according to a different global navigation standard, said receiver comprising:
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a radio frequency (RF) section, said radio frequency section including; at least one mixer arranged to receive said plurality of GNSS signals and arranged to receive at least one local frequency signal, said at least one mixer further arranged to generate a plurality of mixed signals, each of the plurality of mixed signals corresponding to one of the plurality of GNSS signals, the plurality of mixed signals including at least a first mixed signal derived from a first GNSS signal of a first type and a second mixed signal derived from a second GNSS signal of a second type; and a low intermediate frequency (IF) section electrically coupled to said at least one mixer, said low IF section including; a plurality of branches configured to process said plurality of mixed signals, said plurality of branches electrically coupled in parallel downstream of said at least one mixer, said plurality of branches including; a first branch to process said first mixed signal, said first branch including an image rejection filter and at least one second mixer, said image rejection filter configured to reject an image signal of the first mixed signal and said at least one second mixer configured to mix an output signal from said image rejection filter with a second local frequency signal to derive a first remixed signal; and a bypass branch electrically coupled upstream said image rejection filter and downstream said at least one second mixer, said bypass branch including an adjustment module configured to adjust said second mixed signal to overlap a band of an adjusted second mixed signal with a band of said first remixed signal; and a low IF filter electrically coupled downstream said bypass branch and said at least one second mixer, said low IF filter configured to band pass filter said first remixed signal and said adjusted second mixed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to process a plurality of received Global Navigation Satellite System (GNSS) signals of different types, each type of said plurality of received GNSS signals arranged according to a different global navigation standard, said method comprising:
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mixing said plurality of received GNSS signals with a local frequency signal to generate a plurality of mixed signals, each of the plurality of mixed signals corresponding to one of the plurality of received GNSS signals, the plurality of mixed signals including at least a first mixed signal derived from a first GNSS signal of a first type and a second mixed signal derived from a second GNSS signal of a second type; processing in parallel through a plurality of branches said mixed signals, said processing including; in a first branch of said plurality of branches, rejecting an image signal of the first mixed signal with an image rejection filter; in the first branch, mixing an output signal from the image rejection filter with a second local frequency signal to derive a first remixed signal; and in a bypass branch, adjusting said second mixed signal to overlap a band of an adjusted second mixed signal with a band of said first remixed signal; and concurrently band pass filtering with a low IF filter said adjusted second signal and said first remixed signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A non-transitory computer-readable medium containing instructions to execute a method that controls a processing system, said method comprising:
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enabling processing of Global Navigation Satellite System (GNSS) signals from up to four different satellite navigation systems, said four different satellite navigation systems including a Globalnaya navigatsionnaya sputnikovaya sistema (GLONASS) satellite system, a B{hacek over (e)}id{hacek over (o)}u Wè
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t{hacek over (o)}ng (BeiDou) satellite system, a Global Position System (GPS) satellite system, and a Galileo satellite system, said processing including;mixing received GNSS signals with a first local frequency signal to generate a plurality of mixed signals; transforming a first portion of said mixed signals in a first parallel branch, said transforming said first portion of said mixed signals including; filtering said first portion of said mixed signals through a band-pass filter having a bandwidth between about 0 MHz and 46 MHz; and amplifying said filtered first portion of said mixed signals with an automatic gain control (AGC) circuit; transforming a second portion of said mixed signals in a second parallel branch, said transforming said second portion of said mixed signals including; rejecting image signals of said second portion of said mixed signals with an image rejection filter; and mixing output signals from said image rejection filter with a second local frequency signal to derive first remixed signals; transforming a third portion of said mixed signals in a third parallel branch, said transforming said third portion of said mixed signals including; adjusting a phase of said third portion of said mixed signals to overlap a band of said first remixed signals; and concurrently band pass filtering with a low IF filter said adjusted third portion of said mixed signals and said first remixed signals. - View Dependent Claims (18, 19, 20)
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Specification