# US 2023/0056587 A1 · Coordination of pulse repetition frequency (prf) codes in laser-guided applications

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- Number: US 2023/0056587 A1
- Document ID: US20230056587A1
- Status: Published application
- Kind: A1
- Application number: 17/404,747
- Filed: 2021-08-17
- Published: 2023-02-23
- Earliest claimed: 2021-08-17
- Assignees: Raytheon Company
- Applicants: Raytheon Company
- Inventors: Dmitry V. Knyazev; James P. Henderson; Jeremy J. Radtke
- Web page: https://patentgrep.com/patent/US20230056587A1

## CPC

- F41G 7/007: {Preparatory measures taken before the launching of the guided missiles}
- F41G 3/02: using an independent line of sight
- F41G 3/04: for dispersing fire from a battery {; for controlling spread of shots; for coordinating fire from spaced weapons}
- F41G 3/06: with rangefinder (rangefinders per se G01C)
- F41G 3/145: {using a target illuminator}
- F41G 7/2246: {Active homing systems, i.e. comprising both a transmitter and a receiver}
- F41G 7/2293: {using electromagnetic waves other than radio waves}
- F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B)

## Abstract

A method includes removably coupling a projectile interface of a dongle to a dongle interface of a projectile. The method also includes loading a dongle code from the dongle onto the projectile. The dongle code identifies a pulse repetition frequency (PRF) code to be recognized by the projectile. The dongle code may be unique to an operator of the projectile. The method may further include, prior to loading the dongle code onto the projectile, loading an operator code onto the projectile, where the dongle code is loaded onto the projectile in response to the projectile authorizing the operator code. There may be a limited number of uses of the dongle code with different projectiles, and/or there may be a limited amount of time for using the dongle code. A companion electronic device may be used to authenticate the dongle.

## Claims

### Claim 1

A method comprising:
removably coupling a projectile interface of a dongle to a dongle interface of a projectile; and
loading a dongle code from the dongle onto the projectile, wherein the dongle code identifies a pulse repetition frequency (PRF) code to be recognized by the projectile.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
matching the dongle code with a designator code emitted in a signal from a designator to guide the projectile.

### Claim 3 (depends on 1)

The method of claim 1, wherein the dongle code is unique to an operator of the projectile.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
prior to loading the dongle code onto the projectile, loading an operator code onto the projectile;
wherein the dongle code is loaded onto the projectile in response to the projectile authorizing the operator code.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
limiting a number of uses of the dongle code with different projectiles.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
limiting an amount of time for using the dongle code.

### Claim 7 (depends on 1)

The method of claim 1, wherein a companion electronic device is used to authenticate the dongle.

### Claim 8

A projectile assembly comprising:
a projectile comprising a dongle interface; and
a dongle comprising:
a projectile interface configured to be removably coupled to the dongle interface; and
a processor configured to load a dongle code onto the projectile, wherein the dongle code identifies a pulse repetition frequency (PRF) code to be recognized by the projectile.

### Claim 9 (depends on 8)

The projectile assembly of claim 8, wherein the projectile is configured to match the dongle code with a designator code emitted in a signal from a designator to guide the projectile.

### Claim 10 (depends on 8)

The projectile assembly of claim 8, wherein the dongle code is unique to an operator of the projectile.

### Claim 11 (depends on 8)

The projectile assembly of claim 8, wherein:
the processor is further configured, prior to loading the dongle code onto the projectile, to load an operator code onto the projectile; and
the processor is configured to load the dongle code onto the projectile in response to the projectile authorizing the operator code.

### Claim 12 (depends on 8)

The projectile assembly of claim 8, wherein the dongle code has a limited number of uses with different projectiles.

### Claim 13 (depends on 8)

The projectile assembly of claim 8, wherein the dongle code has a limited amount of time for use the projectile.

### Claim 14 (depends on 8)

The projectile assembly of claim 8, wherein the projectile is configured to communicate with a companion electronic device to authenticate the dongle.

### Claim 15 (depends on 8)

The projectile assembly of claim 8, wherein the projectile comprises a missile.

### Claim 16

An apparatus comprising:
a projectile interface configured to be removably coupled to a dongle interface of a projectile; and
a processor configured to load a dongle code onto the projectile, wherein the dongle code identifies a pulse repetition frequency (PRF) code to be recognized by the projectile.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein the dongle code is unique to an operator of the projectile.

### Claim 18 (depends on 16)

The apparatus of claim 16, wherein:
the processor is further configured, prior to loading the dongle code onto the projectile, to load an operator code onto the projectile; and
the processor is configured to load the dongle code onto the projectile in response to the projectile authorizing the operator code.

### Claim 19 (depends on 16)

The apparatus of claim 16, wherein the dongle code has a limited number of uses with different projectiles.

### Claim 20 (depends on 16)

The apparatus of claim 16, wherein the dongle code has a limited amount of time for use the projectile.