# US 12,222,428 B2 · Method for modulating variable binary offset carrier with discrete time-variant frequency, and satellite navigation signal generator using the same

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- Number: US 12,222,428 B2
- Document ID: US12222428B2
- Status: Granted
- Kind: B2
- Application number: 17/695,711
- Filed: 2022-03-15
- Published: 2022-09-22
- Granted: 2025-02-11
- Earliest claimed: 2021-03-16
- Assignees: Electronics and Telecommunications Research Institute; Korea Advanced Institute of Science and Technology
- Applicants: Electronics and Telecommunications Research Institute; Korea Advanced Institute of Science and Technology
- Inventors: Sang Uk Lee; Seung Hyun Kong; Sang Jae Cho; Tai Sun Kim; Seung Hwan Chung
- Web page: https://patentgrep.com/patent/US12222428B2

## CPC

- G01S 19/02: Details of the space or ground control segments
- G01S 19/256: {relating to timing, e.g. time of week, code phase, timing offset}
- G01S 19/32: Multimode operation in a single same satellite system, e.g. GPS L1/L2
- G01S 19/40: Correcting position, velocity or attitude
- G01S 19/44: Carrier phase ambiguity resolution; Floating ambiguity; LAMBDA [Least-squares AMBiguity Decorrelation Adjustment] method
- 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

Provided herein are a method for modulation of a variable binary offset carrier (VBOC) having a discrete time-variant frequency and a satellite navigation signal generator using the same. The method for modulation of a VBOC having a discrete time-variant frequency may comprise: generating navigation message data; generating a carrier; generating a VBOC subcarrier; generating a pseudo-random code; synthesizing the pseudo-random code and the VBOC subcarrier; and synthesizing a synthesized signal of the pseudo-random code and the VBOC subcarrier, the carrier, and the navigation message data.

## Claims

### Claim 1

A method for modulation of a variable binary offset carrier (VBOC) having a discrete time-variant frequency, the method comprising:
generating navigation message data;
generating a carrier;
generating a VBOC subcarrier;
generating a pseudo-random code;
synthesizing the pseudo-random code and the VBOC subcarrier; and
synthesizing a synthesized signal of the pseudo-random code and the VBOC subcarrier, the carrier, and the navigation message data.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the generating of the VBOC subcarrier comprises multiplying an original signal by a square wave with a specific fixed frequency.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the generating of the VBOC subcarrier comprises discretely increasing or decreasing a frequency of a binary offset carrier (BOC) signal over time for a specific period.

### Claim 4 (depends on 3)

The method according to claim 3, wherein a start frequency, an end frequency, and a frequency interval of the frequency of the BOC signal are control parameters configured for the modulation.

### Claim 5

A satellite navigation signal generator performing modulation of a variable binary offset carrier (VBOC) having a discrete time-variant frequency, the satellite navigation signal generator comprising:
a processor; and
a memory storing program instructions executable by the processor,
wherein when executed by the processor, the program instructions cause the processor to:
generate navigation message data;
generate a carrier;
generate a VBOC subcarrier;
generate a pseudo-random code;
synthesize the pseudo-random code and the VBOC subcarrier; and
synthesize a synthesized signal of the pseudo-random code and the VBOC subcarrier, the carrier, and the navigation message data.

### Claim 6 (depends on 5)

The satellite navigation signal generator according to claim 5, wherein in the generating of the VBOC subcarrier, the program instructions cause the processor to multiply an original signal by a square wave with a specific fixed frequency.

### Claim 7 (depends on 5)

The satellite navigation signal generator according to claim 5, wherein in the generating of the VBOC subcarrier, the program instructions cause the processor to discretely increase or decrease a frequency of a binary offset carrier (BOC) signal over time for a specific period.

### Claim 8 (depends on 7)

The satellite navigation signal generator according to claim 7, wherein a start frequency, an end frequency, and a frequency interval of the frequency of the BOC signal are control parameters configured for the modulation.

### Claim 9

A satellite navigation signal generator performing modulation of a variable binary offset carrier (VBOC) having a discrete time-variant frequency, the satellite navigation signal generator comprising:
a navigation message generating unit configured to generate navigation message data;
a carrier generating unit configured to generate a carrier;
a VBOC subcarrier generating unit configured to generate a VBOC subcarrier;
a pseudo-random code generating unit configured to generate a pseudo-random code;
a first synthesizing unit configured to synthesize the pseudo-random code and the VBOC subcarrier; and
a second synthesizing unit configured to synthesize a synthesized signal of the pseudo-random code and the VBOC subcarrier, the carrier, and the navigation message data.

### Claim 10 (depends on 9)

The satellite navigation signal generator according to claim 9, wherein the VBOC subcarrier generating unit multiplies an original signal by a square wave with a specific fixed frequency.

### Claim 11 (depends on 9)

The satellite navigation signal generator according to claim 9, wherein the VBOC subcarrier generating unit discretely increases or decreases a frequency of a binary offset carrier (BOC) signal over time for a specific period.

### Claim 12 (depends on 11)

The satellite navigation signal generator according to claim 11, wherein a start frequency, an end frequency, and a frequency interval of the frequency of the BOC signal are control parameters configured for the modulation.