Method and system for obtaining angle-doppler signatures in MIMO radars

Patent metadata

Field	Value
Publication number	US-10768291-B2
Application number	US-201716341269-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Oct 13, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A method for obtaining an angle-Doppler signature for a target using sparse arrays in multiple-input-multiple-output (MIMO) radar, the MIMO radar including a transmit antenna array, the transmit antenna array being at least one-dimensional (e.g. 2-D, 3-D or 4-D) and having a plurality of antenna elements. The method includes generating transmit signals for transmission by the transmit antenna array, the transmit signals defining at least a first transmit trajectory (e.g. circular) of a phase center within the transmit antenna array, and transmitting the transmit signals using Amplitude Modulation on the transmit antenna array. The method further includes receiving receive signals from the target, the receive signals resulting from the incidence of the transmit signals upon the target, and determining the angle-Doppler signature from the receive signals. The first transmit trajectory is such that, in operation, the phase center undergoes non-linear motion within the transmit antenna array.

First claim

The invention claimed is:

1. A method for obtaining an angle-Doppler signature for a target using multiple-input-multiple-output (MIMO) radar, the MIMO radar including a transmit antenna array, the transmit antenna array being at least one-dimensional and having a plurality of antenna elements, the method comprising:
generating transmit signals for transmission by the transmit antenna array, the transmit signals defining at least a first transmit trajectory of a phase center within the transmit antenna array; and
transmitting the transmit signals using the transmit antenna array;
receiving receive signals from the target, the receive signals resulting from the incidence of the transmit signals upon the target; and
determining the angle-Doppler signature from the receive signals;
wherein the first transmit trajectory is such that, in operation, the phase center undergoes non-linear motion within the transmit antenna array.

2. The method according to claim 1 , wherein the MIMO radar includes a receive antenna array, the receive antenna array being at least one-dimensional and having a plurality of antenna elements, wherein:
receiving the receive signals from the target comprises receiving the receive signals using the receive antenna array; and
the receive signals define at least a first receive trajectory of a phase center within the receive antenna array.

3. The method according to claim 1 , wherein the first transmit trajectory and the first receive trajectory are identical.

4. The method according to claim 1 , wherein the first transmit trajectory and/or the first receive trajectory correspond to an amplitude modulation (AM) of the transmit signals.

5. The method according to claim 4 , wherein the transmit signals are given by

x
⁡

(
t
)

=

w
Tx

⁡

(
t
)

⁢

e

j
⁡

(

ω
0

⁢
t

+

B

T
c

⁢

t
2

)

where the vector w Tx (t) represents the AM, ω 0 is the carrier angular frequency, B is the chirp bandwidth and T c the chirp duration.

6. The method according to claim 1 , wherein the receive signals are given by

y
⁡

(
t
)

=

∑

k
=
1

K

⁢

A
k

⁢

e

j
⁢

⁢

ω
Dk

⁢

t

S
k

⁢

w
Tx

⁡

(
t
)

⁢

e

j
⁡

(

ω
0

⁡

(

t
-

r
k

c
0

)

+

B

T
c

⁢

(

t
-

r
k

c
0

)

2

)

where ω 0 is the carrier angular frequency, S k is the MIMO channel matrix, A k is the k-th target radar cross section, ω Dk is the k-th target Doppler shift, K is the total number of targets, r k is the target range, B is the chirp bandwidth, T C is the chirp duration and c 0 is the spe

Assignees

• Iee Sa
• Univ Luxembourg

Inventors

• Hammes Christian
• Nijsure Yogesh
• Ottersten Bjorn
• Schroder Udo

Classifications

• G01S13/878

  Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector (G01S13/874 takes precedence) · CPC title

• G01S13/42

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S13/46) · CPC title

• G01S13/343 Primary

  using sawtooth modulation · CPC title

• G01S13/931

  of land vehicles · CPC title