Radar apparatus

Patent metadata

Field	Value
Publication number	US-2016259042-A1
Application number	US-201615045338-A
Country	US
Kind code	A1
Filing date	Feb 17, 2016
Priority date	Mar 3, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

A radar apparatus includes: a transmitter which, in operation, transmits, as radar transmission signals, code sequences including a plurality of complementary codes having a code length L in each transmission period; a receiver which, in operation, receives one or more reflected waves including the radar transmission signals reflected by an object and are analog signals; an A/D converter which, in operation, converts the one or more reflected signals into digital signals, which are discrete samples; and a calculator which, in operation, performs a first calculation of correlation between the discrete samples and the code sequence transmitted by the transmitter and a second calculation of correlation between the discrete samples and a partial code sequence obtained by extracting a code length L−Q (L>Q≧2) from a tail end of the code sequence transmitted by the transmitter, and that outputs one of a result of the first correlation calculation and a result of the second correlation calculation.

First claim

What is claimed is:

1 . A radar apparatus comprising:
a transmitter which, in operation, transmits, as radar transmission signals, code sequences including a plurality of complementary codes having a code length L in each transmission period; a receiver which, in operation, receives one or more reflected waves including the radar transmission signals reflected by an object and are analog signals; an analog-to-digital (A/D) converter which, in operation, converts the one or more reflected signals into digital signals, which are discrete samples; and a calculator which, in operation, performs a first calculation of correlation between the discrete samples and the code sequence transmitted by the transmitter and a second calculation of correlation between the discrete samples and a partial code sequence obtained by extracting a code length L−Q (L>Q≧2) from a tail end of the code sequence transmitted by the transmitter, and that outputs one of a result of the first correlation calculation and a result of the second correlation calculation.

2 . The radar apparatus according to claim 1 ,
wherein the code sequence includes 2L complementary codes, and the transmitter transmits the 2L complementary codes in a predetermined number of transmission periods.

3 . The radar apparatus according to claim 1 ,
wherein the code sequence satisfies expressions (1) and (2):

RS

S
1

:

S
2



(

τ
,

A


(
1
)

,

A


(

2



L

)

)

=

∑

m
=
1

2



L





∑

n
=

S
1

S
2





a


(
m
)

n
+
τ



a


(
m
)

n
*

(
1
)

{

RS

S
1

:

S
2



(

τ
,

A


(
1
)

,

A


(

2



L

)

)

≠
0

Assignees

• Panasonic Corp

Inventors

• Kishigami Takaaki
• Takeda Noriaki

Classifications

• G01S13/284 Primary

  using coded pulses · CPC title

• G01S7/2886

  using I/Q processing · CPC title

• G01S7/288

  Coherent receivers · CPC title

• G01S13/288

  phase modulated · CPC title

• G01S13/28 Primary

  with time compression of received pulses · CPC title