# US 2017/0285174 A1 · Receiver and Receiving Method for Navigation Signals

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- Number: US 2017/0285174 A1
- Document ID: US20170285174A1
- Status: Published application
- Kind: A1
- Application number: 15/509,622
- Filed: 2015-09-16
- Published: 2017-10-05
- Earliest claimed: 2014-09-19
- Assignees: Tsinghua University
- Applicants: Tsinghua University
- Inventors: Yonghui ZHU; Xiaowei CUI; Mingquan LU
- Web page: https://patentgrep.com/patent/US20170285174A1

## CPC

- G01S 19/29: carrier {including Doppler,} related {(G01S19/246 takes precedence)}
- G01S 19/30: code related {(G01S19/246 takes precedence)}
- G01S 19/14: specially adapted for specific applications
- G01S 19/36: relating to the receiver frond end
- G01S 19/37: Hardware or software details of the signal processing chain
- 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

A receiver and a receiving method for receiving wideband binary-offset-carrier modulated signals. The receiver includes a tracking apparatus which includes an upper sideband processor operable to generate upper sideband correlations through correlating a local upper sideband replica against a received navigation signal, a lower sideband processor operable to generate lower sideband correlations through correlating a local lower sideband replica against the received navigation signal, and an estimator operable to determine a delay estimate based on the upper sideband correlations and the lower sideband correlations.

## Claims

### Claim 1

A receiver for receiving navigation signals, the receiver comprising:
a tracking apparatus including:
an upper sideband processor operable to generate upper sideband correlations through correlating a local upper sideband replica against a received navigation signal;
a lower sideband processor operable to generate lower sideband correlations through correlating a local lower sideband replica against the received navigation signal; and
an estimator operable to determine a delay estimate based on the upper sideband correlations and the lower sideband correlations.

### Claim 2 (depends on 1)

The receiver as claimed in claim 1, wherein the upper sideband correlations contain code delay information and coupled sub-carrier and carrier delay information of upper sideband, and the lower sideband correlations contain code delay information and coupled sub-carrier and carrier delay information of lower sideband.

### Claim 3 (depends on 2)

The receiver as claimed in claim 2, wherein the estimator is operable to coherently combine the upper sideband correlations and the lower sideband correlations to decouple the coupled sub-carrier and carrier delay information and to estimate at least one of a code delay, a sub-carrier delay and a carrier delay.

### Claim 4 (depends on 3)

The receiver as claimed in claim 3, wherein the estimator is operable to feed back at least one of the estimated code delay, sub-carrier delay and carrier delay to the upper sideband processor for generating the local upper sideband replica and to the lower sideband processor for generating the local lower sideband replica.

### Claim 5 (depends on 3)

The receiver as claimed in claim 3, wherein the upper sideband correlations generated by the upper sideband processor include an early, a prompt and a late correlation of an I branch of the upper sideband and an early, a prompt and a late correlation of a Q branch of the upper sideband, and the lower sideband correlations generated by the lower sideband processor include an early, a prompt and a late correlation of an I branch of the lower sideband and an early, a prompt and a late correlation of a Q branch of the lower sideband.

### Claim 6 (depends on 5)

The receiver as claimed in claim 5, wherein the estimator comprises:
a coherent processor operable to coherently combine the early, the prompt and the late correlation of the I branch of the upper sideband with the early, the prompt and the late correlation of the I branch of the lower sideband, and to coherently combine the early, the prompt and the late correlation of the Q branch of the upper sideband with the early, the prompt and the late correlation of the Q branch of the lower sideband, so as to obtain code delay information and decoupled sub-carrier and carrier delay information; and
a discriminator operable to estimate a code delay, a sub-carrier delay and a carrier delay by discriminating combination results from the coherent processor containing the code delay information and decoupled sub-carrier and carrier delay information.

### Claim 7 (depends on 6)

The receiver as claimed in claim 6, wherein
the upper sideband processor comprises:
a first reference carrier generator operable to generate a local reference carrier signal of the upper sideband based on the estimated sub-carrier and carrier delays fed back from the estimator,
a first reference code generator operable to generate a local reference code signal of the upper sideband based on the estimated code delay fed back from the estimator, and
a first correlator unit operable to correlate the local reference carrier signal of the upper sideband and the local reference code signal of the upper sideband against the received navigation signal; and
the lower sideband processor comprises:
a second reference carrier generator operable to generate a local reference carrier signal of the lower sideband based on the estimated sub-carrier and carrier delays fed back from the estimator,
a second reference code generator operable to generate a local reference code signal of the lower sideband based on the estimated code delay fed back from the estimator, and
a second correlator unit operable to correlate the local reference carrier signal of the lower sideband and the local reference code signal of the lower sideband against the received navigation signal.

### Claim 8

The receiver as claimed in any one of preceding claims, wherein the tracking apparatus further includes a mode determining unit operable to determine a working mode of the estimator.

### Claim 9 (depends on 8)

The receiver as claimed in claim 8, wherein the working mode of the estimator comprises a dual-band estimation mode and a single-band estimation mode.

### Claim 10

A receiving method for receiving navigation signals, and the method comprises:
generating upper sideband correlations through correlating a local upper sideband replica against a received navigation signal;
generating lower sideband correlations through correlating a local lower sideband replica against the received navigation signal; and
determining a delay estimate based on the upper sideband correlations and the lower sideband correlations.

### Claim 11 (depends on 10)

The receiving method as claimed in claim 10, wherein the upper sideband correlations contain code delay information and coupled sub-carrier and carrier delay information of upper sideband, and the lower sideband correlations contain code delay information and coupled sub-carrier and carrier delay information of lower sideband.

### Claim 12 (depends on 11)

The receiving method as claimed in claim 11, wherein the method further comprises coherently combining the upper sideband correlations and the lower sideband correlations to decouple the coupled sub-carrier and carrier delay information and to estimate at least one of a code delay, a sub-carrier delay and a carrier delay.

### Claim 13 (depends on 12)

The receiving method as claimed in claim 12, wherein the method further comprises feeding back at least one of the estimated code delay, sub-carrier delay and carrier delay for generating the local upper sideband replica and the local lower sideband replica.

### Claim 14 (depends on 13)

The receiving method as claimed in claim 13, wherein the upper sideband correlations include an early, a prompt and a late correlation of an I branch of the upper sideband and an early, a prompt and a late correlation of a Q branch of the upper sideband, and the lower sideband correlations include an early, a prompt and a late correlation of an I branch of the lower sideband and an early, a prompt and a late correlation of a Q branch of the lower sideband.

### Claim 15 (depends on 14)

The receiving method as claimed in claim 14, wherein the method further comprises:
coherently combining the early, prompt and late correlation of the I branch of the upper sideband with the early, prompt and late correlation of the I branch of the lower sideband, and coherently combining the early, prompt and late correlation of the Q branch of the upper sideband with the early, prompt and late correlation of the Q branch of the lower sideband, so as to obtain code delay information and decoupled sub-carrier and carrier delay information; and
estimating a code delay, a sub-carrier delay and a carrier delay by discriminating combination results containing the code delay information and decoupled sub-carrier and carrier delay information.

### Claim 16 (depends on 15)

The receiving method as claimed in claim 15, wherein the method further comprises:
generating a local reference carrier signal of the upper sideband based on the estimated sub-carrier and carrier delays,
generating a local reference code signal of the upper sideband based on the estimated code delay, and
correlating the local reference carrier signal of the upper sideband and the local reference code signal of the upper sideband against the received navigation signal; and
generating a local reference carrier signal of the lower sideband based on the estimated sub-carrier and carrier delays,
generating a local reference code signal of the lower sideband based on the estimated code delay fed back from the estimator, and
correlating the local reference carrier signal of the lower sideband and the local reference code signal of the lower sideband against the received navigation signal.

### Claim 17 (depends on 10, 11, 12, 13, 14, 15, 16)

The receiving method as claimed in any one of claims 10-16, wherein the method further comprises:
determining a working mode for obtaining the delay estimate.

### Claim 18 (depends on 17)

The receiving method as claimed in claim 17, wherein the working mode comprises a dual-band estimation mode and a single-band estimation mode.

### Claim at position 19

19-20. (canceled)

### Claim 21 (depends on 1)

The receiver as claimed in claim 1, wherein the navigation signals are wideband binary-offset-carrier (BOC) modulated signals.

### Claim 22 (depends on 10)

The method as claimed in claim 10, wherein the navigation signals are wideband binary-offset-carrier (BOC) modulated signals