Method and apparatus for reading code using short-range millimeter wave (MMWAVE) radar

Patent metadata

Field	Value
Publication number	US-10228458-B2
Application number	US-201715449498-A
Country	US
Kind code	B2
Filing date	Mar 3, 2017
Priority date	Mar 3, 2016
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

A code reading method and a radar system using a short-range millimeter wave (mmWave) radar are provided. The method includes transmitting a mmWave radar signal to a target object from a radar system and receiving a reflection wave signal reflected on the target object, extracting reflection signal strengths for a plurality of line codes constituting the target object from the reflection wave signal, compensating for the reflection signal strengths considering a difference in antenna gain between the plurality of line codes as per an antenna radiation pattern of the radar system, forming a radar image using the compensated reflection signal strengths, and reading a binary code from the radar image.

First claim

What is claimed is:

1. A method for reading a code using a short-range millimeter wave (mmWave) radar, the method comprising:
transmitting a mmWave radar signal to a target object in a radar system and receiving a reflection wave signal reflected on the target object;
extracting reflection signal strengths for a plurality of line codes constituting the target object from the reflection wave signal;
compensating for the reflection signal strengths based on a difference in antenna gain between the plurality of line codes as per an antenna radiation pattern of the radar system;
forming a radar image using the compensated reflection signal strengths; and
reading a binary code from the radar image.

2. The method of claim 1 , wherein the compensating for the reflection signal strengths comprises:
identifying a first antenna gain of a line code positioned at a center of the plurality of line codes based on the antenna radiation pattern,
identifying a second antenna gain of a first line code of the plurality of line codes based on the antenna radiation pattern, and
compensating for a reflection signal strength of the first line code by multiplying the reflection signal strength of the first line code by a ratio of the first antenna gain relative to the second antenna gain.

3. The method of claim 1 , further comprising compensating for the reflection signal strengths or the compensated reflection signal strengths based on a difference in distance between the line codes.

4. The method of claim 1 , wherein the compensating for the reflection signal strengths comprises:
identifying a minimum distance between the radar system and the target object;
calculating a distance between the radar system and a first line code of the plurality of line codes; and
compensating for a reflection signal strength of the first line code by multiplying the reflection signal strength of the first line code by a ratio of the distance to the first line code relative to the minimum distance.

5. The method of claim 1 , further comprising calculating times to scan the reflection wave signal, wherein the times are calculated by an equation:

t
k

=



l
k

-

l

k
-
1



v

+

t

k
-
1

,

⁢

k
=
1

,
2
,
3
,
⋯
⁢

,

2
⁢
n

l
k

=

r
·

tan
(



n
-
k



n

⁢

cos

-
1

⁡

(

r

d
0

)

)

,

⁢

k
=
0

,
1
,
2
,
3
,
⋯
⁢

,

2
⁢
n

wherein t k denotes each time when the reflection wave signal is measured, d 0 denotes a distance to the target object detected at initial measurement for the reflection wave signal, v denotes a moving velocity of the target object which is detected at t 0 , r denotes a minimum distance to the target object, and 2n+1 denotes a certain number of times of measurement.

6. The method of claim 1 , further comprising calculating times to scan the reflection wave signal, wherein the times are calculated by an equation:

t
k

=



l
k

-

l

k
-
1



v

k
-
1

+

(

v

k
-
1

-

v

k
-
2

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Joo-Sung
• Bae Ki-Taek
• Kim Dae-Hyun
• HAN Seung-Ku
• Yang Tae-Sik
• Chang Sang-Hyun

Classifications

• G01S13/89 Primary

  for mapping or imaging · CPC title

• G01S13/753

  using frequency selective elements, e.g. resonator · CPC title

• G01S13/881

  for robotics · CPC title

• G01S13/88

  Radar or analogous systems specially adapted for specific applications (electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00) · CPC title

• G01S13/584

  adapted for simultaneous range and velocity measurements · CPC title