Method, system and device for radar based high resolution object detection
In an embodiment of the present disclosure, a Radar transceiver for object detection comprises a two dimensional antenna array receiving plurality of a reflected radio frequency (RF) signals, a mux-adder selectively adding the reflected RF signals in first mode and selectively multiplexing the reflected RF signals in a second mode, a range bin detector determining a valid range bins in the first mode and a three dimensional (3D) image reconstructor operating on the valid range bins to reconstruct a 3D image of the object in the second mode. In that the two dimensional antenna array comprises antenna elements arranged in K rows and M columns, and the mux-adder adds a RF signal received on the M columns of each row in the first mode. The mux-adder multiplexes the RF signal received on the M columns of each row in the second mode.
1. A Radar transceiver for an object detection comprising:
a two dimensional antenna array receiving plurality of a reflected radio frequency (RF) signals;
a mux-adder selectively adding the reflected RF signals in a first mode and selectively multiplexing the reflected RF signals in a second mode;
a range bin detector determining a valid range bins and velocity in the first mode; and
a three dimensional (3D) image reconstructor operating on the valid range bins to reconstruct a 3D image of the object in the second mode.
2. The radar transceiver of claim 1 , wherein the two dimensional antenna array comprising antenna elements arranged in K rows and M columns, and the mux-adder adds a RF signal received on the M columns of an each row in the first mode.
3. The radar transceiver of claim 2 , wherein the mux-adder multiplexes the RF signal received on the M columns of each row in the second mode.
4. The radar transceiver of claim 3 , further comprising K number of circuit blocks each for adding corresponding RF signals received on the K rows in the first mode and multiplexing in the second mode.
5. The radar transceiver of claim 4 , wherein the first mode is operative over a first chirp and the second mode is operative over M chirps.
6. The radar transceiver of claim 5 , further comprising K number of RF receivers each converting the RF signal from the K number of circuit blocks to a digital data sequence.
7. The radar transceiver of claim 6 , wherein the 3D image reconstructor comprises a high speed narrow band filter operative over the valid range bins.
8. The radar transceiver of claim 7 , wherein the high speed narrow band filter extract a valid spectrum of the object using a relation:
[
Valid
per
element
per
object
data
]
=
∑
p
=
N
1
N
2
e
j
(
-
Vprx
(
n
)
)
∑
n
=
0
N
RX
(
n
*
Ts
)
*
e
j
(
-
2
π
pn
N
)
in that N1 through N2 represents the valid range bins received from the mux-adder, N represents a total number of range bins, RX(n*Ts) represents n th sample sampled at every Ts interval received per antenna elements in the two dimensional antenna array, Vprx represents phase velocity of a p th bin.
9. The radar transceiver of claim 8 , wherein the range bin detector determine the valid range bins by employing a one dimensional Fast Fourier transform.
10. A method in a Radar transceiver comprising:
receiving plurality of a reflected radio frequency (RF) signals;
selectively adding the reflected RF signals in a first mode and selectively multiplexing the reflected RF signals in a second mode;
determining a valid range bins and velocity in the first mode; and
operating on the valid range bins to reconstruct a 3D image of an object in the second mode.
11. The method of claim 10 , wherein the plurality of the reflected RF signal is received through a two dimensional antenna array comprising antenna elements arranged in K rows and M columns, and adding a RF signal received on the M columns of each row in the first mode.
12. The method of claim 11 , further comprising multiplexing the RF signal received on the M columns of each row in the second mode.
13. The method of claim 12 , further comprising adding corresponding RF signals received on the K rows in the first mode and multiplexing in the second mode.
14. The method of claim 13 , further comprising operating over a first chirp in the first mode and operating over M chirps in the second mode.
15. The method of claim 14 , further comprising converting the RF signal from K number of circuit blocks to a digital data sequence.
16. The method of claim 15 , further comprising extracting a valid spectrum of the object using a relation:
[
Valid
per
element
per
object
data
]
=
∑
p
=
N
1
N
2
e
j
(
-
Vprx
(
n
)
)
∑
n
=
0
N
RX
(
n
*
Ts
)
*
e
j
(
-
2
π
pn
N
)
in that N1 through N2 represents the valid range bins, N represents a total number of range bins, RX(n*Ts) represents n th sample sampled at every Ts interval received per the antenna elements in the two dimensional antenna array, Vprx represents phase velocity of a p th bin.
17. The method of claim 16 , further comprising determining the valid range bins by employing a one dimensional Fast Fourier transform.