System and method for the wireless terminal receiving sensitivity performance test based on data mode
A method and system for the wireless terminal receiving sensitivity performance test based on a data mode are provided. The method comprises: building a human body model, in which the upper limb of the model holds the device under test at a predefined distance in front of the head of the model; taking the antenna of the device under test as the origin to build a spherical coordinate and selecting a testing point in the spherical coordinate; placing the model under the circumstance of a full-anechoic chamber; enabling the device under test to work in a data mode, and collecting the receiving power at the testing point in the spherical placement system using the testing antenna, so as to obtain the total power receiving sensitivity of the device under test. In this way, the performance influence on the mobile terminal from the human body coupling of the human being in a data mode can be actually reflected, the reality is high and the usage is easy.
1. A method for a wireless terminal receiving sensitivity performance test based on a data mode, comprising:
building a human body model, in which an upper limb of the model holds a device under test at a predefined distance in front of head of the model;
taking antenna of the device under test as origin to build a spherical coordinate and selecting a testing point in the spherical coordinate; and
placing the model under circumstance of a full-anechoic chamber, enabling the device under test to work in a data mode, and collecting receiving power at the testing point in the spherical placement system using a testing antenna, so as to obtain total power receiving sensitivity of the device under test, wherein the testing antenna is a dual-polarized antenna, wherein the receiving power collected at each testing point comprises a horizontal polarization component and a vertical polarization component, and wherein the process of obtaining the power receiving sensitivity of the device under test after collecting the horizontal polarization component and the vertical polarization component comprises:
respectively obtaining the total receiving sensitivity at each testing point according to the following formula (1) and then normalizing the total receiving sensitivity at each testing point:
TRS
=
4
π
∮
[
1
EIS
θ
(
Ω
;
f
)
+
1
EIS
φ
(
Ω
;
f
)
]
ⅆ
Ω
,
formula
(
1
)
wherein TRS is the total receiving sensitivity at the current testing point, θ and φ are testing angles, EIS θ and EIS φ are a horizontal polarization component and a vertical polarization component respectively, Ω is the three-dimensional direction angle of the current testing point in the spherical coordinate, and f is the current working frequency of the device under test; and
obtaining the total receiving sensitivity of the device under test according to the following formula (2):
TRS
≈
2
NM
π
∑
n
=
0
N
-
1
∑
m
=
0
M
-
1
[
1
EIS
θ
(
θ
n
,
φ
m
;
f
)
+
1
EIS
φ
(
θ
n
,
φ
m
;
f
)
]
sin
(
θ
n
)
,
formula
(
2
)
wherein TRS is the total receiving sensitivity of the device under test, N and M are multiple sampling intervals for θ and φ respectively, EIS θ (θ n , φ m ) is the horizontal polarization component of the receiving power of the testing point having a testing angle of θ n and φ m , EIS φ (θ n , φ m ) is the vertical polarization component of the receiving power of the testinu point having a testing angle of θ n and φ m , and f is the current working frequency of the device under test.
2. The method according to claim 1 , wherein the process of building a human body model further comprises:
filling the model with artificial human tissue fluid.
3. A system for a wireless terminal receiving sensitivity performance test based on a data mode, comprising:
a full-anechoic chamber, configured to provide a testing circumstance for the wireless terminal:
a human body model, an upper limb of which holds a device under test at a predefined distance in front of head of the human body model;
a spherical coordinate building and testing module, configured to take an antenna of the device under test as origin to build a spherical coordinate and to select a testing point in the spherical coordinate;
a spherical placement system, configured to control an angle position of the wireless terminal with respect to a testing antenna in the spherical coordinate;
the testing antenna, configured to collect the receiving power of the wireless terminal at the testing point under control of the spherical placement system when the wireless terminal is in a data mode; and
a processing unit, configured to obtain power receiving sensitivity of the device under test according to receiving power of the wireless terminal at the testing point when the wireless terminal is in a data mode, wherein the testing antenna is a dual-polarized antenna, wherein the receiving power collected at each testing point comprises a horizontal polarization component and a vertical polarization component and wherein the process of obtaining the power receiving sensitivity of the device under test after collecting the horizontal polarization component and the vertical polarization component comprises:
respectively obtaining the total receiving sensitivity at each testing point according to the following formula (1) and then normalizing the total receiving sensitivity at each testing point:
TRS
=
4
π
∮
[
1
EIS
θ
(
Ω
;
f
)
+
1
EIS
φ
(
Ω
;
f
)
]
ⅆ
Ω
,
formula
(
1
)
wherein TRS is the total receiving sensitivity at the current testing point, θ and φ are testing angles, EIS θ and EIS φ are a horizontal polarization component and a vertical polarization component respectively, Ω is the three-dimensional direction angle of the current testing point in the spherical coordinate, and f is the current working frequency of the device under test: and
obtaining the total receiving sensitivity of the device under test according to the following formula (2):
TRS
≈
2
NM
π
∑
n
=
0
N
-
1
∑
m
=
0
M
-
1
[
1
EIS
θ
(
θ
n
,
φ
m
;
f
)
+
1
EIS
φ
(
θ
n
,
φ
m
;
f
)
]
sin
(
θ
n
)
,
formula
(
2
)
wherein TRS is the total receiving sensitivity of the device under test, N and M are multiple sampling intervals for θ and φ respectively, EIS θ (θ n , φ m ) is the horizontal polarization component of the receiving power of the testing point having a testing angle of θ n and φ m , EIS φ (θ n , φ m ) is the vertical polarization component of the receiving power of the testing point having a testing angle of θ n and φ m , and f is the current working frequency of the device under test.
4. The system according to claim 3 , wherein the human body model is filled with artificial human tissue fluid.