# US 8,571,088 B2 · Suppression of multipath effects for received SPS signals

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- Number: US 8,571,088 B2
- Document ID: US8571088B2
- Status: Granted
- Kind: B2
- Application number: 11/938,743
- Filed: 2007-11-12
- Published: 2009-05-14
- Granted: 2013-10-29
- Earliest claimed: 2007-11-12
- Assignees: QUALCOMM Incorporated
- Applicants: Rayman Pon
- Inventors: Rayman Pon
- Web page: https://patentgrep.com/patent/US8571088B2

## CPC

- G01S 19/30: code related {(G01S19/246 takes precedence)}
- G01S 19/22: Multipath-related issues
- 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 suppressing the effects of multipath signals. For an example, a signal comprising at least one binary offset carrier (BOC) modulation signal is received. The BOC modulation signal is modulated with a pseudorandom noise sequence comprising a plurality of chips, wherein each of the chips has a set interval. The received signal is correlated with portions of the plurality of chips to provide a power signal and to remove at least a portion of a multipath component in the received signal from the power signal. The portions of the chips are less than the set interval.

## Claims

### Claim 1

A method comprising:
receiving a signal comprising at least one binary offset carrier (BOC) modulation signal, said BOC modulation signal being modulated with a pseudorandom noise sequence and comprising a plurality of chips, each of said chips having a set interval; and
correlating said received signal with portions of each chip of said plurality of chips to provide a power signal, said portions of said chips being less than said set interval to remove at least a portion of a multipath component in said received signal from said power signal.

### Claim 2 (depends on 1)

The method of claim 1, wherein said portions of each chip of said chips comprise a middle region.

### Claim 3 (depends on 2)

The method of claim 2, wherein the middle region comprises approximately one-half of a chip period centered approximately at a mid-point of the chip period for the plurality of chips.

### Claim 4 (depends on 2)

The method of claim 2, wherein the middle region comprises approximately one-eighth of a chip period centered approximately at a mid-point of the chip period for the plurality of chips.

### Claim 5 (depends on 1)

The method of claim 1, wherein the binary offset carrier modulation signal comprises a BOC(1,1) signal.

### Claim 6 (depends on 5)

The method of claim 5, wherein said receiving the signal comprises receiving the BOC(1,1) signal from a satellite.

### Claim 7 (depends on 6)

The method of claim 6, wherein the satellite comprises a Galileo satellite.

### Claim 8 (depends on 6)

The method of claim 6, wherein the satellite comprises a satellite capable of transmitting an L1C signal.

### Claim 9 (depends on 1)

The method of claim 1, wherein said receiving the signal comprises receiving the BOC signal at a subscriber station.

### Claim 10 (depends on 1)

The method of claim 1, wherein said portions of each chip of said plurality of chips comprise a region centered at a chip boundary.

### Claim 11 (depends on 1)

The method of claim 1, wherein said portions of each chip of said plurality of chips are defined by one or more programmable parameters.

### Claim 12 (depends on 11)

The method of claim 11, wherein the one or more programmable parameters comprise a parameter specifying a center location.

### Claim 13 (depends on 12)

The method of claim 12, wherein the one or more programmable parameters comprise a parameter specifying a region size.

### Claim 14 (depends on 1)

The method of claim 1, wherein said receiving the signal comprises receiving the signal from a pseudolite.

### Claim 15 (depends on 1)

The method of claim 1, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary.

### Claim 16 (depends on 1)

The method of claim 1, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary if a bit transition is present approximately at the chip boundary.

### Claim 17

An article comprising:
a storage medium, said storage medium comprising machine-readable instructions stored thereon which, if executed by a computing platform, are adapted to cause said computing platform to:
receive a signal comprising at least one binary offset carrier (BOC) modulation signal, said BOC modulation signal being modulated with a pseudorandom noise sequence and comprising a plurality of chips, each of said chips having a set interval; and
correlate said received signal with portions of each chip of said plurality of chips to provide a power signal, said portions of said chips being less than said set interval to remove at least a portion of a multipath component in said received signal from said power signal.

### Claim 18 (depends on 17)

The article of claim 17, wherein said portions of each chip of said chips comprise a middle region.

### Claim 19 (depends on 18)

The article of claim 18, wherein the middle region comprises approximately one-half of a chip period centered approximately at a mid-point of the chip period for each chip of the plurality of chips.

### Claim 20 (depends on 18)

The article of claim 18, wherein the middle region comprises approximately one-eighth of a chip period centered approximately at a mid-point of the chip period for each chip of the plurality of chips.

### Claim 21 (depends on 17)

The article of claim 17, wherein said portions of each chip of said plurality of chips comprise a region centered at a chip boundary.

### Claim 22 (depends on 17)

The article of claim 17, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary.

### Claim 23 (depends on 17)

The article of claim 17, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary if a bit transition is present approximately at the chip boundary.

### Claim 24

A subscriber station comprising:
a receiver to receive a signal comprising at least one binary offset carrier (BOC) modulation signal, said BOC modulation signal being modulated with a pseudorandom noise sequence and comprising a plurality of chips, each of said chips having a set interval; and
a correlator to correlate at least in part said received signal with portions of each chip of said plurality of chips to provide a power signal, said portions of said chips being less than said set interval to remove at least a portion of a multipath component in said received signal from said power signal.

### Claim 25 (depends on 24)

The subscriber station of claim 24, wherein said portions of each chip of said chips comprise a middle region.

### Claim 26 (depends on 25)

The subscriber station of claim 25, wherein the middle region comprises approximately one-half of a chip period centered approximately at a mid-point of the chip period for each chip of the plurality of chips.

### Claim 27 (depends on 25)

The subscriber station of claim 25, wherein the middle region comprises approximately one-eighth of a chip period centered approximately at a mid-point of the chip period for each chip of the plurality of chips.

### Claim 28 (depends on 24)

The subscriber station of claim 24, wherein said portions of each chip of said plurality of chips comprise a region centered at a chip boundary.

### Claim 29 (depends on 24)

The subscriber station of claim 24, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary if a bit transition is present approximately at the chip boundary.

### Claim 30 (depends on 25)

The subscriber station of claim 25, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary.

### Claim 31

A system, comprising:
a position determination entity; and
a subscriber station comprising a receiver to receive a signal comprising at least one binary offset carrier (BOC) modulation signal, said BOC modulation signal being modulated with a pseudorandom noise sequence and comprising a plurality of chips, each of said chips having a set interval, and a correlator to correlate at least in part said received signal with portions of each chip of said plurality of chips to provide a power signal, said portions of said chips being less than said set interval to remove at least a portion of a multipath component in said received signal from said power signal.

### Claim 32 (depends on 31)

The system of claim 31, wherein said portions of each chip of said chips comprise a middle region.

### Claim 33 (depends on 32)

The system of claim 32, wherein the middle region comprises approximately one-half of a chip period centered approximately at a mid-point of the chip period for each chip of the plurality of chips.

### Claim 34 (depends on 32)

The system of claim 32, wherein the middle region comprises approximately one-eighth of a chip period centered approximately at a mid point of the chip period for each chip of the plurality of chips.

### Claim 35 (depends on 31)

The system of claim 31, wherein said portions of each chip of said plurality of chips comprise a region centered at a chip boundary.

### Claim 36 (depends on 31)

The system of claim 31, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary.

### Claim 37 (depends on 31)

The system of claim 31, wherein said portions of each chip of said plurality of chips comprise a middle region and a region centered at a chip boundary if a bit transition is present approximately at the chip boundary.