KR102316466B1 - Inspecting apparatus for internal calibration, satellite synthetic aperture radar having the same, and inspecting method - Google Patents

Abstract

The present invention relates to an inspecting apparatus for inspecting performance of a plurality of transceivers provided in a satellite synthetic aperture radar comprising: a matrix generator for generating a plurality of encoding matrices for encoding output signals output from the plurality of transceivers by group; and a calculator detecting the output signals encoded by the plurality of encoding matrices to calculate gains and phases of each of the plurality of transceivers. It is possible to check performance of the transceivers promptly.

Description

Inspection apparatus for internal correction, satellite synthetic aperture radar having the same, and inspection method

The present invention relates to an inspection apparatus for internal correction, a satellite synthetic aperture radar having the same, and an inspection method, and an inspection apparatus for internal correction that can quickly check the performance of a transmission/reception module provided in a satellite synthetic aperture radar, the It relates to a satellite synthetic aperture radar provided with, and an inspection method.

In general, a synthetic aperture radar (SAR) is a device that transmits radio waves to the ground through an active phased array antenna and creates an image of the earth's surface using reflected waves. Therefore, the synthetic aperture radar is mainly mounted on an artificial satellite or an aircraft and used to observe a desired area or perform a reconnaissance mission.

In this case, the planar active phased array antenna has a problem in that it is difficult to mount it on an artificial satellite because it is heavy. Therefore, many hybrid type active phased array antennas are mounted on artificial satellites. The hybrid type active phased array antenna has a structure in which a beam is generated by feeding power to transmission/reception modules, and the generated beam is reflected by a sub-reflector and a main reflector to radiate to the outside.

However, due to an error, the gain and phase applied by the operator to the transceiver modules may be different from the actual gain and phase. Accordingly, there are problems such as reduction in gain of the antenna and beam deflection.

US 10-1222050 B

The present invention provides an inspection apparatus for internal correction capable of quickly confirming the performance of a transmission/reception module provided in a satellite composite aperture radar, a satellite composite aperture radar having the same, and an inspection method.

The present invention provides an inspection apparatus for internal correction capable of correcting a transmission/reception module according to the performance of the transmission/reception module, a satellite synthetic aperture radar having the same, and an inspection method.

The present invention is an inspection apparatus for inspecting the performance of a plurality of transmission/reception modules provided in a satellite synthesis aperture radar, dividing the plurality of transmission/reception modules into a plurality of groups, a matrix generator for generating a plurality of encoding matrices for encoding the output signals output from the module for each group; and a calculator for calculating a gain and a phase of each path of the plurality of transmission/reception modules for each group by performing a simultaneous equation operation on the plurality of encoding matrices received from the matrix generator.

The matrix generator includes a first encoding matrix for encoding a portion of the output signals output from the plurality of transmission/reception modules, and a second encoding matrix for encoding other portions of output signals output from the plurality of transmission/reception modules A plurality of coding matrices are generated.

The first coding matrix has ^{a size of 2 n} ×2 ⁿ (n is a natural number), and the second coding matrix has a size of 2 ^m ×2 ^m (m is a natural number smaller than n).

The size of the first coding matrix satisfies the following relation (1).

Relation (1): 2 ⁿ < T < 2 ⁿ⁺¹

(where T is the number of transmission/reception modules provided in the satellite synthesis aperture radar)

The size of the second coding matrix satisfies any one of the following Relational Expressions (2) and (3).

Relation (2): 2 ^m < T-2 ⁿ < 2 ^m+1

Relation (3): 2 ^m-1 < T-2 ⁿ ≤ 2 ^m

The present invention includes a plurality of transmitting and receiving modules; an inspection device for inspecting the performance of the plurality of transmission/reception modules; and a test signal generator configured to generate a test signal input to each of the plurality of transceiver modules so that an output signal is output from the plurality of transceiver modules.

a comparator for comparing a gain of each of the plurality of transmission/reception modules with a preset target gain, and comparing a phase of each of the plurality of transmission/reception modules with a preset target phase; and at least one of a difference between a gain of each of the plurality of transmission/reception modules and the target gain, and a difference between a phase of each of the plurality of transmission/reception modules and the target phase, to generate a signal transmitted by the plurality of transmission/reception modules It further includes a corrector for correcting the image.

The present invention is an inspection method for inspecting the performance of a plurality of transmission/reception modules provided in a satellite synthesis aperture radar, dividing the plurality of transmission/reception modules into a plurality of groups, generating a plurality of encoding matrices for encoding the output signals output from the module for each group; and calculating a gain and a phase of each path of the plurality of transmission/reception modules for each group by performing a simultaneous equation operation on the plurality of encoding matrices.

The generating of the plurality of encoding matrices includes: a first encoding matrix for encoding some output signals output from the plurality of transmission/reception modules, and a first encoding matrix for encoding other portions of output signals output from the plurality of transmission/reception modules and generating a plurality of encoding matrices including the second encoding matrix.

In the process of generating the first encoding matrix and the second encoding matrix, the first encoding matrix has ^{a size of 2 n} × 2 ⁿ (n is a natural number), and the second encoding matrix has a size of 2 ^m × 2 ^m ( m is a natural number less than n).

In the process of generating the first encoding matrix, the size of the first encoding matrix satisfies the following relational expression (1).

Relation (1): 2 ⁿ < T < 2 ⁿ⁺¹

(where T is the number of transmission/reception modules provided in the satellite synthesis aperture radar)

In the process of generating the second encoding matrix, the size of the second encoding matrix satisfies any one of the following Relational Expressions (2) and (3).

Relation (2): 2 ^m < T-2 ⁿ < 2 ^m+1

Relation (3): 2 ^m-1 < T-2 ⁿ ≤ 2 ^m

generating a check signal before generating the plurality of coding matrices; and inputting the test signal to the plurality of transmission/reception modules, and outputting output signals from the plurality of transmission/reception modules.

After the process of calculating the gain and phase of each of the plurality of transmission/reception modules, a gain difference is calculated by comparing the gains of each of the plurality of transmission/reception modules with a preset target gain, and the phase of each of the plurality of transmission/reception modules is set in advance Comparing with the target phase, the method further includes calculating a phase difference.

The coding matrix includes a Hadamard matrix.

According to embodiments of the present invention, by examining the transmission/reception module provided in the satellite synthetic aperture radar, it is possible to quickly check the performance of the transmission/reception module. Accordingly, even if the performance of the transceiver module is deteriorated, the image generated by the signal transmitted by the transceiver modules can be corrected easily in response. Therefore, the satellite synthetic aperture radar can be operated stably.

1 is a view showing the structure of a satellite synthetic aperture radar according to an embodiment of the present invention.
2 is a flowchart illustrating an inspection method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art completely It is provided to inform you. In order to explain the invention in detail, the drawings may be exaggerated, and like numerals refer to like elements in the drawings.

1 is a view showing the structure of a satellite synthetic aperture radar according to an embodiment of the present invention. Hereinafter, an artificial satellite synthetic aperture radar according to an embodiment of the present invention will be described.

A satellite synthetic aperture radar is a device mounted on a satellite to observe the Earth from space. The satellite synthesis aperture radar 100 includes a plurality of transmission/reception modules 110 , and an inspection device 120 .

The transmission/reception module 110 may transmit a radiation signal forming a beam pattern or receive an external reception signal. A plurality of transmission/reception modules 110 may be installed and arranged on the satellite body or the reflector. For example, the transmit/receive module 110 may be a transmit-receive module (TRM), and the transmit/receive modules 110 may be arranged in an active phased array system.

In this case, the satellite synthesis aperture radar 100 may further include a reflector (not shown) and an inspection signal generator 130 . The reflector is disposed to reflect the radiation signal transmitted by the transceiver module 110 . The reflector may be installed in the satellite body. The directivity of the beam formed by the transceiver module 110 may be improved by the reflector.

For example, the reflector may be formed in a casegrain structure. That is, the reflector is disposed to face the transceiver modules 110 and has a sub-reflection plate having a curvature, and the sub-reflector plate to reflect the radiation signal reflected from the sub-reflection plate, and has a larger area than the sub-reflection plate and has a curvature It may include a main reflector. Transceiver modules 110 may be installed in the center of the main reflector. However, the structure of the reflective plate is not limited thereto and may vary.

The test signal generator 130 may be connected to the transmission/reception modules 110 or may be installed to input signals to the transmission/reception modules 110 . Accordingly, when the inspection signal generator 130 generates the inspection signal, the inspection signal may be input to each of the plurality of transmission/reception modules 110 , and output signals may be output from the plurality of transmission/reception modules 110 .

At this time, before sending the artificial satellite into space, the inspection signal generator 130 may be mounted on the artificial satellite on the ground. When the test signal generator 130 is mounted on the artificial satellite, the operator may preset a condition in which the test signal generator 130 generates the test signal. Accordingly, when the artificial satellite is sent to space, the inspection signal generator 130 may generate an inspection signal under a set condition, and the operator may obtain information about the inspection signal in advance.

The test apparatus 120 may test the performance of the plurality of transmit/receive modules 110 . The inspection device 120 may be installed to communicate with the transceiver modules 110 on the ground, or may be installed in the satellite body and connected to receive signals from the transceiver modules 110 . The inspection apparatus 120 includes a matrix generator 121 and a calculator 122 .

The matrix generator 121 divides the plurality of transmission/reception modules into a plurality of groups, and generates a plurality of encoding matrices for encoding the output signals output from the plurality of transmission/reception modules according to the test signals input to the plurality of transmission/reception modules for each group. can do. The coding matrix may be a Hadamard matrix. Accordingly, encoding may be performed for each transmission/reception module by the predefined Amadar matrix. In ^{order for a Hadamard matrix having a size of 2 n} × 2 ⁿ to have a unique solution, the size of each row and column must be equal to or greater than the number of transmission/reception modules 110 .

At this time, when the number of transmitting and receiving modules 110 is 300, a Hadamard matrix must be created with a size of ^{512 (=2 9 )×512 greater than 300.} Therefore, since the test signal has to be input 512 times, there is a problem that the test time becomes longer as the number of transmission/reception modules 110 increases. Accordingly, by making a plurality of coding matrices for each group, the number of inputting of the inspection signal can be reduced to be the same as or almost similar to the number of the transmission/reception modules 110 , thereby shortening the inspection time.

To this end, the matrix generator 121 generates a first encoding matrix for encoding some output signals output from the plurality of transmission/reception modules 110 , and another portion of output signals output from the plurality of transmission/reception modules 110 . A plurality of encoding matrices including the second encoding matrix for encoding may be generated. Accordingly, the matrix generator 121 may generate two or more encoding matrices.

The first encoding matrix may ^{have a size of 2 n} × 2 ⁿ (n is a natural number), and the second encoding matrix may have a size of 2 ^m × 2 ^m (m is a natural number smaller than n). When three or more coding matrices are generated, the size of the coding matrix generated after the second coding matrix may be smaller than the size of the second coding matrix.

In this case, the size of the first encoding matrix may satisfy the following relational expression (1). The first coding matrix may have the largest size among the plurality of generated coding matrices.

Relation (1): 2 ⁿ < T < 2 ⁿ⁺¹

Here, T is the number of transmission/reception modules 110 provided in the satellite synthesis aperture radar, and n is a natural number. Accordingly, the size of the generated first encoding matrix may be determined according to the number of transmission/reception modules 110 .

The size of the second encoding matrix satisfies any one of the following Relational Expressions (2) and (3). The size of the second coding matrix may be smaller than that of the first coding matrix, and the size of the second coding matrix may be larger than that of other coding matrices.

Relation (2): 2 ^m < T-2 ⁿ < 2 ^m+1

Relation (3): 2 ^m-1 < T-2 ⁿ ≤ 2 ^m

Here, T is the number of transmission/reception modules 110 provided in the satellite synthesis aperture radar, n is a natural number, and m is a natural number smaller than n. Accordingly, the size of the generated second encoding matrix may be determined according to the number of transmission/reception modules 110 and the size of the first encoding matrix.

In this case, when the size of the second encoding matrix satisfies the relational expression (2), another encoding matrix (one or more) having a size smaller than that of the second encoding matrix may be generated. That is, when the relational expression (2) is satisfied, since the ^{sum of 2 n , which is the size value of the first encoding matrix, and 2 m,} which is the size value of the second encoding matrix, is smaller than the number of transmission/reception modules 110, the size value of the encoding matrices In order for the sum of the values to be greater than or equal to the number of transmission/reception modules 110 , an additional encoding matrix must be generated in addition to the first and second encoding matrices. Accordingly, the encoding matrix may be generated until the sum of the size values of the encoding matrices is equal to or greater than the number of the transceiver modules 110 .

For example, when the number of transmission/reception modules 110 is 300, 300 = 2 ⁸ (=256) + 2 ⁵ (=32) + 2 ³ (=8) + 2 ² (=4). Therefore, the sum of the size values of the encoding matrices only with the first encoding matrix having a size of ^{2 8} × 2 ^{8 and the second encoding matrix having a size of 2 5} × 2 ⁵ may be equal to or greater than the number of transmission/reception modules 110 . Since there is no such thing, a third encoding matrix having a size of ^{2 3} × 2 ³ and a fourth encoding matrix having a size of ^{2 2} × 2 ^{2 can be generated.} Accordingly, by dividing the transmission/reception modules 110 into a plurality of groups, an encoding matrix may be generated for each group.

Meanwhile, when the size of the second encoding matrix satisfies the relational expression (3), up to the second encoding matrix and another encoding matrix having a size smaller than that of the second encoding matrix may not be generated. That is, when the relation (3) is satisfied, since the ^{sum of 2 n , which is the size value of the first coding matrix, and 2 m,} which is the size value of the second coding matrix, is greater than or equal to the number of transmission/reception modules 110 , the first and second There is no need to generate an additional coding matrix in addition to the coding matrix.

In detail, when the size of the second encoding matrix satisfies the relational expression (3), the ^{sum of 2 n , which is the size value of the first encoding matrix, and 2 m,} which is the size value of the second encoding matrix, is the number of transmission/reception modules 110 . We can find the values of n and m that make them equal to . Accordingly, the sizes of the first encoding matrix and the second encoding matrix may be determined according to the number of transmission/reception modules 110 .

The calculator 122 may calculate the gain and phase of each path of the plurality of transmission/reception modules 110 for each group by performing a simultaneous equation operation on the plurality of encoding matrices received from the matrix generator 121 . That is, the calculator 122 may receive the encoding matrices generated by the matrix generator 121 and express the encoding matrices as simultaneous equations to calculate the gain and phase of each of the plurality of transmission/reception modules 110 .

Meanwhile, the satellite synthesis aperture radar 100 may further include a comparator 140 and a comparator 150 . Accordingly, it is possible to correct the transmission/reception module 110 whose performance is degraded.

The comparator 140 may receive the gain and phase of each of the transceiver modules 110 calculated by the calculator 122 . For example, the comparator 140 may be disposed on the ground to receive information calculated by the calculator 122 . Accordingly, the comparator 140 compares the respective gains of the plurality of transmission/reception modules 110 with a preset target gain to calculate a gain difference, and compares the phases of each of the plurality of transmission/reception modules 110 with a preset target phase to obtain a phase difference can be calculated. Accordingly, it can be confirmed to what extent the performance of which transmission/reception module 110 is degraded.

The compensator 150 may receive and store the gain difference and the phase difference calculated by the comparator 140 . For example, the comparator 150 may be disposed on the ground to receive a comparison result of the comparator 140 . Accordingly, when generating an image with the signal transmitted from the transceiver modules 110 on the ground, the corrector 150 reflects at least one of the gain difference and the phase difference of each of the plurality of transceiver modules 110 You can correct the image you create. Accordingly, a high-quality image can be obtained.

As such, by examining the transmission/reception module 110 provided in the satellite synthesis aperture radar 100 , the performance of the transmission/reception module 110 can be quickly checked. Therefore, even if the performance of the transceiver module 110 is deteriorated, it is possible to easily respond to the image generated by the signal transmitted by the transceiver module 110 . Accordingly, it is possible to stably operate the satellite synthetic aperture radar 100 .

2 is a flowchart illustrating an inspection method according to an embodiment of the present invention. Hereinafter, an inspection method according to an embodiment of the present invention will be described.

The inspection method according to an embodiment of the present invention is an inspection method for inspecting the performance of a plurality of transmission/reception modules provided in the satellite synthetic aperture radar. The inspection method includes a process of dividing a plurality of transmission/reception modules into a plurality of groups, and generating a plurality of encoding matrices for encoding the output signals output from the plurality of transmission/reception modules for each group by the inspection signal input to the plurality of transmission/reception modules ( S110), and performing a simultaneous equation operation on the plurality of encoding matrices to calculate the gain and phase of each path of the plurality of transmission/reception modules for each group (S120).

At this time, below, the inspection method using the artificial satellite synthetic aperture radar 100 according to an embodiment of the present invention having the structure as shown in FIG. 1 will be described as an example. However, the present invention is not limited thereto, and the performance test of the transceiver modules may be performed according to the test method according to the embodiment of the present invention even in the satellite composite aperture radar having a different structure.

In this case, before generating a plurality of coding matrices, a check signal may be generated. The test signal may be input to the plurality of transmission/reception modules 110 , and output signals may be output from the plurality of transmission/reception modules 110 . For example, the test signal generator 130 connected to the transceiver modules 110 to input a signal may generate the test signal, branch the test signal, and input the signal to each of the transceiver modules 110 . Since the test signal generator 130 generates the test signal under a preset condition, the operator can obtain information about the test signal in advance.

A plurality of encoding matrices for encoding the output signals output from the plurality of transmission/reception modules for each group are generated (S110). That is, it is possible to group a plurality of transmit/receive modules and create a partial encoding matrix for each group.

In this case, the coding matrix may be a Hadamard matrix. Accordingly, encoding can be performed for each transmission/reception module by a predefined Hadamard matrix. In ^{order for a Hadamard matrix having a size of 2 n} × 2 ⁿ to have a unique solution, the size of each row and column must be equal to or greater than the number of transmission/reception modules 110 . ^{Accordingly, a plurality of coding matrices having a size of 2 n} × 2 ⁿ (n is a natural number) may be generated for each group of the plurality of transmission/reception modules 110 . For example, if an output signal output by inputting the M-th check signal is expressed as a coding matrix, it can be expressed as the following matrix (1). In the following, t may be a transmission/reception module, and η may be a test signal.

Matrix(1):

Meanwhile, the Hadamard matrix may be expressed as the following matrix (2) in consideration of noise caused by the hardware structure inside the satellite antenna. In the following, t may be a transceiver module, η may be a test signal, and n may be noise.

Matrix(2):

At this time, a first encoding matrix for encoding some output signals output from the plurality of transmission/reception modules 110 , and a second encoding matrix for encoding other portions of output signals output from the plurality of transmission/reception modules 110 , A plurality of coding matrices including Accordingly, two or more coding matrices according to two or more groups may be generated.

The first encoding matrix may ^{have a size of 2 n} × 2 ⁿ (n is a natural number), and the second encoding matrix may have a size of 2 ^m × 2 ^m (m is a natural number smaller than n). When three or more coding matrices are generated, the size of the coding matrix generated after the second coding matrix may be smaller than the size of the second coding matrix.

In this case, the size of the first encoding matrix may satisfy the following relational expression (1). The first coding matrix may have the largest size among the plurality of generated coding matrices.

Relation (1): 2 ⁿ < T < 2 ⁿ⁺¹

Here, T is the number of transmission/reception modules 110 provided in the satellite synthesis aperture radar, and n is a natural number. Accordingly, the size of the generated first encoding matrix may be determined according to the number of transmission/reception modules 110 .

The size of the second encoding matrix satisfies any one of the following Relational Expressions (2) and (3). The size of the second coding matrix may be smaller than that of the first coding matrix, and the size of the second coding matrix may be larger than that of other coding matrices.

Relation (2): 2 ^m < T-2 ⁿ < 2 ^m+1

Relation (3): 2 ^m-1 < T-2 ⁿ ≤ 2 ^m

Here, T is the number of transmission/reception modules 110 provided in the satellite synthesis aperture radar, n is a natural number, and m is a natural number smaller than n. Accordingly, the size of the generated second encoding matrix may be determined according to the number of transmission/reception modules 110 and the size of the first encoding matrix.

In this case, when the size of the second encoding matrix satisfies the relational expression (2), another encoding matrix (one or more) having a size smaller than that of the second encoding matrix may be generated. When the size of the second encoding matrix satisfies the relational expression (3), up to the second encoding matrix and another encoding matrix having a size smaller than that of the second encoding matrix may not be generated.

For example, when the number of transmission/reception modules 110 is 300, 300 = 2 ⁸ (=256) + 2 ⁵ (=32) + 2 ³ (=8) + 2 ² (=4). Accordingly, ^{the first encoding matrix having a size of 2 8} × 2 ⁸ , the second encoding matrix having a size of 2 ⁵ × 2 ⁵ , a third encoding matrix having a size of ^{2 3} × 2 ^{3 , 2 2} × 2 ² A fourth coding matrix having a size may be generated. Accordingly, by dividing the transmission/reception modules 110 into a plurality of groups, an encoding matrix may be generated for each group.

In this way, an encoding matrix may be created for each group using a value equal to or similar to the number of transmission/reception modules 110 . Therefore, since the number of input of the inspection signal can be reduced according to the number of the transmission/reception modules 110 , the inspection time can be shortened.

Next, a simultaneous equation operation is performed on the plurality of encoding matrices to calculate the gain and phase of each path of the plurality of transmission/reception modules for each group (S120). To this end, it is possible to classify a synthesized signal that has passed through the transmission/reception modules 110 from the plurality of encoding matrices and calculates the gain and phase of each of the plurality of transmission/reception modules 110 . That is, it is possible to calculate the gain and phase of each of the plurality of transmission/reception modules 110 (or the transmission/reception path including the transmission/reception module 110 ) by expressing the encoding matrices as a simultaneous equation.

On the other hand, after calculating the gain and phase of each of the plurality of transmission/reception modules 110 (or the transmission/reception path including the transmission/reception module 110 ), the calculated gains are compared with a preset target gain to calculate the difference in gain and comparing each calculated phase with a preset target phase to calculate a phase difference. Accordingly, it is possible to determine to what extent the performance of which transmission/reception module 110 (or the transmission/reception path including the transmission/reception module 110) is degraded.

Then, the calculated gain difference and phase difference information may be stored. Accordingly, when generating an image with the signal transmitted from the transmission/reception modules 110 on the ground, the corrector 150 includes a plurality of transmission/reception modules 110 (or a transmission/reception path including the transmission/reception module 110), respectively. An image generated by reflecting at least one of a gain difference and a phase difference of . Accordingly, a high-quality image can be obtained.

As such, by examining the transmission/reception module 110 provided in the satellite synthesis aperture radar 100 , the performance of the transmission/reception module 110 can be quickly checked. Therefore, even if the performance of the transceiver module 110 is deteriorated, it is possible to easily respond to the image generated by the signal transmitted by the transceiver module 110 . Accordingly, it is possible to stably operate the satellite synthetic aperture radar 100 .

As such, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention, and various combinations between the embodiments are possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims to be described below as well as the claims and equivalents.

100: satellite synthetic aperture radar 110: transceiver module
120: inspection device 121: matrix generator
122: calculator 130: check signal generator
140: comparator 150: compensator

Claims (15)

As an inspection device for inspecting the performance of a plurality of transmission and reception modules provided in the satellite synthetic aperture radar,
a matrix generator for dividing a plurality of transmission/reception modules into a plurality of groups, and generating a plurality of encoding matrices for encoding output signals output from the plurality of transmission/reception modules for each group according to a test signal input to the plurality of transmission/reception modules; and
and a calculator for calculating a gain and a phase of each path of the plurality of transmission/reception modules for each group by performing a simultaneous equation operation on the plurality of encoding matrices received from the matrix generator. The method according to claim 1,
The matrix generator is
A plurality of encoding matrices including a first encoding matrix for encoding some output signals output from the plurality of transmission/reception modules, and a second encoding matrix for encoding other portions of output signals output from the plurality of transmission/reception modules inspection device that generates 3. The method according to claim 2,
The first coding matrix has ^{a size of 2 n} ×2 ⁿ (n is a natural number), and the second coding matrix has a size of 2 ^m ×2 ^m (m is a natural number smaller than n). 4. The method according to claim 3,
The size of the first coding matrix satisfies the following relation (1).
Relation (1): 2 ⁿ < T < 2 ⁿ⁺¹
(where T is the number of transmission/reception modules provided in the satellite synthesis aperture radar) 5. The method according to claim 4,
The size of the second coding matrix satisfies any one of the following Relational Expressions (2) and (3).
Relation (2): 2 ^m < T-2 ⁿ < 2 ^m+1
Relation (3): 2 ^m-1 < T-2 ⁿ ≤ 2 ^m a plurality of transceiver modules;
The inspection device of any one of claims 1 to 5 for inspecting the performance of the plurality of transmission/reception modules; and
A satellite synthesis aperture radar comprising a; an inspection signal generator for generating an inspection signal input to each of the plurality of transmission/reception modules so that an output signal is output from the plurality of transmission/reception modules. 7. The method of claim 6,
a comparator for comparing a gain of each of the plurality of transmission/reception modules with a preset target gain, and comparing a phase of each of the plurality of transmission/reception modules with a preset target phase; and
An image generated as a signal transmitted by the plurality of transmission/reception modules according to at least one of a difference between a gain of each of the plurality of transmission/reception modules and the target gain, and a difference between a phase of each of the plurality of transmission/reception modules and the target phase A compensator for compensating for; satellite synthesis aperture radar comprising more. As an inspection method for inspecting the performance of a plurality of transmission and reception modules provided in the artificial satellite synthetic aperture radar,
dividing a plurality of transmission/reception modules into a plurality of groups, and generating a plurality of encoding matrices for encoding output signals output from the plurality of transmission/reception modules according to the test signals input to the plurality of transmission/reception modules for each group; and
and calculating a gain and a phase of each path of the plurality of transmission/reception modules for each group by performing a simultaneous equation operation on the plurality of encoding matrices. 9. The method of claim 8,
The process of generating the plurality of coding matrices comprises:
A plurality of encoding matrices including a first encoding matrix for encoding some output signals output from the plurality of transmission/reception modules, and a second encoding matrix for encoding other portions of output signals output from the plurality of transmission/reception modules An inspection method comprising the process of generating 10. The method of claim 9,
In the process of generating the first coding matrix and the second coding matrix,
The first coding matrix has ^{a size of 2 n} ×2 ⁿ (n is a natural number), and the second coding matrix has a size of 2 ^m ×2 ^m (m is a natural number smaller than n). 11. The method of claim 10,
In the process of generating the first coding matrix,
The size of the first coding matrix satisfies the following relation (1).
Relation (1): 2 ⁿ < T < 2 ⁿ⁺¹
(where T is the number of transmission/reception modules provided in the satellite synthesis aperture radar) 12. The method of claim 11,
In the process of generating the second coding matrix,
The size of the second encoding matrix satisfies any one of the following Relational Expressions (2) and (3).
Relation (2): 2 ^m < T-2 ⁿ < 2 ^m+1
Relation (3): 2 ^m-1 < T-2 ⁿ ≤ 2 ^m 9. The method of claim 8,
Before the process of generating the plurality of coding matrices,
generating a test signal; and
and inputting the test signal to the plurality of transmission/reception modules, and outputting output signals from the plurality of transmission/reception modules. 9. The method of claim 8,
After the process of calculating the gain and phase of each of the plurality of transmission and reception modules,
The inspection method further comprising the step of calculating a gain difference by comparing the gains of each of the plurality of transmission/reception modules with a preset target gain, and calculating the phase difference by comparing the phases of each of the plurality of transmission/reception modules with a preset target phase . 15. The method according to any one of claims 8 to 14,
The coding matrix includes a Hadamard matrix.

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