# US 10,502,817 B2 · Laser transmitter and method for operating the same

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- Number: US 10,502,817 B2
- Document ID: US10502817B2
- Status: Granted
- Kind: B2
- Application number: 16/189,172
- Filed: 2018-11-13
- Published: 2019-09-05
- Granted: 2019-12-10
- Earliest claimed: 2018-03-02
- Applicants: Youn Min Chung
- Inventors: Youn Min Chung
- Web page: https://patentgrep.com/patent/US10502817B2

## CPC

- G01S 7/4911: Transmitters
- G01S 7/495: Counter-measures or counter-counter-measures {using electronic or electro-optical means}
- G01S 17/88: Lidar systems specially adapted for specific applications
- H04K 3/22: {including jamming detection and monitoring}
- 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
- H04K: SECRET COMMUNICATION; JAMMING OF COMMUNICATION

## Abstract

Disclosed are a laser transmitter and a method for operating the same. The laser transmitter may include: a laser signal receiving unit configured to receive monitor laser signals transmitted by a laser-based speed monitor; a laser signal transmitting unit configured to transmit jamming laser signals against the received monitor laser signals; and a control unit configured to measure the signal intervals of the received monitor laser signals when the monitor laser signals are detected, compute information for the jamming laser signals by using the measured signal intervals, and generate the jamming laser signals according to the computed information.

## Claims

### Claim 1

A laser transmitter comprising:
a laser signal receiving unit configured to receive monitor laser signals transmitted by a laser-based speed monitor;
a laser signal transmitting unit configured to transmit jamming laser signals against the received monitor laser signals; and
a control unit configured to measure signal intervals of received monitor laser signals when the monitor laser signals are detected, compute information for the jamming laser signals by using the measured signal intervals, and generate the jamming laser signals according to the computed information,
wherein the control unit:
measures signal intervals sequentially by receiving a preset n number of monitor laser signals (where n is a natural number), and
computes a timing setting time, a signal interval, and a transmitting time of the jamming laser signals by using the measured signal intervals.

### Claim 2 (depends on 1)

The laser transmitter of claim 1, wherein the timing setting time is determined as a shortest signal interval from among the measured signal intervals.

### Claim 3 (depends on 1)

The laser transmitter of claim 1, wherein the signal interval of the jamming laser signals is determined as a common divisor of the measured signal intervals.

### Claim 4 (depends on 1)

The laser transmitter of claim 1, wherein the transmitting time of the jamming laser signals is computed by multiplying an average of the measured signal intervals by a preset number of monitor laser signals.

### Claim 5 (depends on 1)

The laser transmitter of claim 1, wherein the control unit, after measuring the signal intervals sequentially by receiving the n number of monitor laser signals, transmits jamming laser signals for a duration of the computed transmitting time in the computed interval after a period of the timing setting time from a time point when an n-th monitor laser signal is received.

### Claim 6 (depends on 5)

The laser transmitter of claim 5, wherein, if a monitor laser signal is received after a transmission of the jamming laser signals is completed, the control unit repeatedly transmits the jamming laser signals by setting a timing with the timing setting time from a time point when the received monitor laser signal is received.

### Claim 7

A method for operating a laser transmitter, the method comprising:
(a) receiving monitor laser signals transmitted by a laser-based speed monitor;
(b) measuring a signal interval of the received monitor laser signals;
(c) computing information for to-be-transmitted jamming laser signals by using the measured signal intervals; and
(d) generating the jamming laser signals according to the computed information and transmitting the jamming laser signals,
wherein the step (b) measures signal intervals sequentially by receiving a preset n number of monitor laser signals (where n is a natural number); and
the step (c) computes a timing setting time, a signal interval, and a transmitting time of the jamming laser signals by using the measured signal intervals.