KR20040044608A - Phased array antenna capable of self-test and the self-test method of the antenna - Google Patents

Abstract

PURPOSE: A phased array antenna having a self-check function and a checking method thereof are provided to decide abnormal states of a phase shifter and a signal processor by using a transmission unit of a radar, a phased array antenna, and a signal processor. CONSTITUTION: A phased array antenna having a self-check function includes a phased array antenna and a self-check circuit. The phased array antenna includes a rotor, a power distributor, a plurality of phase shifters, a beam control computer, a plurality of antennas, and a plurality of termination loads. The rotor(11) is used for transmitting the transmission power of a radar system to the other system and transmitting a received signal to a reception unit of the radar system. The power distributor(12) is used for distributing the transmission power. The phase shifters(13) are used for controlling phases of output signals of the power distributor. The beam control computer(14) is used for outputting a control signal for controlling phases of the phase shifters. The antennas(15) are used for radiating the output signals of the phase shifters. The termination loads(16) are used for extinguishing the remaining signals. The self-check circuit(130) is used for deciding abnormal states of the phase shifters by calculating a phase value of a check signal.

Description

Self-checking phased array antenna and its inspection method {PHASED ARRAY ANTENNA CAPABLE OF SELF-TEST AND THE SELF-TEST METHOD OF THE ANTENNA}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar system, and more particularly, to a self-checking phased array antenna capable of self-checking whether a phase shifter and a receiving channel are normally operated in a radar using a phased array antenna and a method of checking the same.

In general, a radar system is a device capable of transmitting electromagnetic waves to an arbitrary object through an antenna having a large directivity, receiving a reflected wave from the object, and measuring the distance and direction to the object. It is used in various fields such as securing safety.

Recent radar-related technologies can be divided into antenna, transmitter and receiver, and signal processing.

In the antenna field, high-speed multi-target antenna technology, low-lobe antenna technology, digital beam forming (DBF) technology, adaptive array antenna technology, and conformal array antenna technology by electron scanning method Etc.

In the field of transmitter / receiver, there are high-definition and high-purity broadband transmission / reception technology, semiconductor transmission / reception module manufacturing technology using GaAs FET, MMIC manufacturing technology, etc. In the signal processing field, high-speed signal processing technology using semiconductor components, multi-dimensional Multi-domain signal processing technology.

In particular, when the antenna needs an antenna having high directivity, low side lobe level, fast beam scanning, and low power characteristics, a reflector antenna and a phased array antenna are mainly used.

The reflective antenna uses a magnetron as a high power generator and scans the beam through mechanical rotation.

On the other hand, instead of scanning the beam of the antenna by mechanical rotation, the phased array antenna scans the beam by electronically controlling the phase of the power supplied to the array element. Therefore, since the phased array antenna has an advantage of changing the shape and direction of the beam instantaneously, interest in the phased array antenna is increasing.

As shown in FIG. 1, the phased array antenna 10 as described above includes a rotator 11, a power divider 12, a phase shifter 13, a beam steering computer 14, and an antenna 15. ) And the termination load 16. Here, the phased array antenna of FIG. 1 is a one-dimensional phased array antenna. 1 is a block diagram schematically illustrating a configuration of a general one-dimensional phased array antenna.

The rotor 11 is configured to transmit the transmission power supplied from the transmitting unit 1 of the radar system to the power divider 12 and to transmit the received signal received from the power divider 12 to the receiving unit 2 of the radar system. .

The power divider 12 is configured to divide the transmission power into the plurality of powers when the transmission power is input from the rotor 11 and to transmit the power to each phase shifter 13.

A plurality of phase shifters 13 are provided, and according to a control signal input from the beam steering computer 14, the phase of the signal input through the power divider 12 is appropriately adjusted and output.

The beam steering computer 14 outputs a control signal so that each phase shifter 13 can adjust the phase according to the direction of the beam's direction.

The antenna 15 radiates (radiates) signals output from each phase shifter 13 into free space.

The termination load 16 is configured to exhaust the remaining signal radiated from each antenna 15 with heat.

The operation of the one-dimensional phased array antenna will be described with reference to FIGS. 1 and 2 as follows.

2 is an explanatory diagram for explaining a beam steering method of a general one-dimensional phased array antenna.

Referring to the process of transmitting a signal from the antenna, when the transmission power generated from the transmission unit 1 of the radar system is transmitted to the power divider through the rotator 11, the power divider 12 powers the transmit power into a plurality of signals Is distributed to each phase shifter 13.

Then, the phase shifter 13 properly adjusts the phase of the signal transmitted to each antenna 15 according to the beam direction to be directed in the vertical direction under the control of the beam steering computer 14, and outputs the result to the antenna 15. Each antenna 15 radiates a signal transmitted from each phase shifter 13 into free space. On the contrary, in the reception process, the signal reflected from the object is input to the receiver 2 through the antenna 15, the phase shifter 13, the power divider 12 and the rotator 11, and the reflected signal is processed.

At this time, since the electromagnetic wave radiated by each antenna has a different phase according to the radiated antenna, the direction of the beam is determined according to the phase set in the phase shifter in space. Looking at this in more detail, if the phase of the signal transmitted to each antenna as shown in Figure 2 in each phase shifter, the electromagnetic wave signal radiated from each antenna will generate a time difference in phase, By Huygen's Principle, the antenna beam is directed at a specific angle. Here, the principle of Huygens describes the principle of how to obtain the shape of the wave as a picture. "If a given wavefront is given, the wavefront of the next instant is generated when each point on the given wavefront becomes an independent wave source. A plane that is in common contact with a secondary spherical wave becomes a new wavefront. "

In such a phased array antenna, a phase shifter plays a very important role. If one or more of the phase shifters fails or malfunctions, the beamwidth of the antenna is widened or the side lobe is increased, thereby degrading the performance of the radar system. .

Therefore, it is possible to determine whether the phase shifter is in normal operation. This can be determined by directly disconnecting the phase shifter from the antenna to measure the normal operation or by measuring the electric field of the antenna surface in the transmission state of the antenna. However, when it is judged that there is an abnormality of the phase shifter, the operation of the radar system must be stopped for a long time, a part of the antenna must be removed, and various measurement equipments must be used, and thus a lot of time is consumed. There is a problem.

Accordingly, an object of the present invention is to solve the above problems, and by using a transmitter, a phased array antenna, a receiver, and a signal processor of the radar itself without separating the phase shifter from the antenna, By determining whether there is an abnormality, it saves time, provides convenience to the measurer, and actively copes with failures.

1 is a block diagram schematically showing the configuration of a typical one-dimensional phased array antenna

2 is an explanatory diagram for explaining a beam steering method of a general one-dimensional phased array antenna

3 is a block diagram schematically illustrating a configuration of a phased array antenna capable of self-check according to the first embodiment of the present invention.

4 is a block diagram schematically illustrating a configuration of a phased array antenna capable of self-check according to a second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: transmitting unit of radar system 11: rotating machine

12 power divider 13 phase shifter

14 beam steering computer 15 antenna

16: terminal load 110, 210: power divider

120, 220: switching unit 130, 230: self-check control unit

140, 240: power combiner 150, 250: signal processor

Features of the present invention for achieving the above object,

A power splitter that transmits the transmission power supplied from the transmission unit of the radar system to the other side and transmits the received reception signal to the reception channel of the radar system, and a power divider that divides the transmission power into a plurality of powers when the transmission power is input from the rotor. And a plurality of phase shifters for properly adjusting and outputting a phase of a signal input through the power divider according to a control signal input from the outside, and allowing the phase shifters to adjust phases according to a direction in which beams are directed. A beam steering computer for outputting a control signal, a plurality of antennas for copying signals output from each of the phase shifters into free space, and a plurality of end loads for exhausting the signals remaining from each of the antennas with heat; A phased array antenna;

Separating the check signal supplied from the transmitting unit of the radar system into a plurality of signals and input to any desired phase shifter to calculate the phase value and magnitude of the check signal input through this to determine whether the phase shifter is abnormal It is characterized by including a self-check circuit.

Here, the self-check circuit,

A power divider for separating and outputting a check signal input from the outside into a plurality of signals;

A switching unit provided in each line of the power distributor and switched according to a control signal input from the outside and having a plurality of switches to supply the check signal output from the power distributor to the other end;

A self-check controller for generating and outputting a control signal to control the switching of the switching unit;

A power combiner installed between the antenna and the termination load and configured to introduce a check signal supplied from the switching unit into the antenna;

Outputs a control signal to the beam steering computer, the self-check controller and the transmitter of the radar system, and outputs a control signal through a specific switch connected to the switching unit, the antenna connected thereto, and a specific channel connected to the phase shifter connected thereto. After calculating the phase value and magnitude of the check signal input through the rotor and storing it sequentially, when the storage is completed, the phase of the measured signal is changed by the phase difference changed by the phase shifter through the stored value of the specific channel. And a signal processor for determining whether the phase shifter is abnormal by checking the phase shifter of each other channel again.

Here also the self-check circuit,

A power divider for separating and outputting a check signal input from the outside into a plurality of signals;

A switching unit provided in each line of the power distributor and switched according to a control signal input from the outside and having a plurality of switches to supply the check signal output from the power distributor to the other end;

A self-check controller for generating and outputting a control signal to control the switching of the switching unit;

A power combiner installed between the phase shifter and the antenna and introducing a check signal supplied from the switching unit to the phase shifter;

Outputs a control signal to the beam steering computer to vary the phase of the phase shifter to be checked, and in this state, the phase of the other phase shifter is adjusted based on the phase shifter whose phase value is varied so that the radar is operated. At the time of changing the direction of the radar beam during the operation of the radar system, the control unit outputs a control signal to the transmitter of the radar system and the self-checking controller to switch on the switching unit connected to the phase shifter to be checked and thereby the power divider. And a signal processor which determines whether there is an abnormality of the phase processor by sequentially calculating whether the measured value is changed by the phase difference changed by the phase shifter by calculating the phase value and magnitude of the check signal input through the rotor. It includes.

Here again the check signal,

A signal of the same frequency as the transmission power supplied from the transmission unit of the radar system,

It is supplied from the transmitter of the radar system.

Here again the power splitter,

It consists of a microstrip or strip structure.

Another feature of the invention,

A rotor for transmitting the transmission power supplied from the transmitter of the radar system to the other side, and transmitting the received signal to the receiver of the radar system; A plurality of phase shifters for properly adjusting and outputting a phase of a signal input through the power divider according to a control signal input from an outside, and controlling the phase shifters to adjust phases according to a direction in which beams are directed A beam steering computer for outputting a signal, a plurality of antennas for copying the signals output from each of the phase shifters into free space, and a plurality of end loads for exhausting the remaining signals from each of the antennas with heat; In the inspection method of a phased array antenna,

Adjusting the phase of any phase shifter at the start of the radar system or by stopping the operation of the radar system and checking itself;

Outputting a check signal that is a signal of the same frequency as the transmission power at the transmitting unit of the radar system only to the antenna connected to the arbitrary phase shifter when the phase of the arbitrary phase shifter is adjusted;

Calculating and storing a phase value and a magnitude of a check signal input through the antenna, an arbitrary phase shifter and a receiver;

Comprising the phase of the arbitrary phase shifter when the storage is completed, calculating the phase value and magnitude of the check signal and storing it;

Determining whether the phase of the measured signal is changed by the phase difference that is changed by the arbitrary phase shifter through the stored values when all of the measured values of the arbitrary phase shifter are completed;

If it is determined whether any phase shifter is abnormal, it is characterized in that the step of sequentially determining whether or not all the phase shifter is abnormal.

Another feature of the invention,

A rotor for transmitting the transmission power supplied from the transmitter of the radar system to the other side, and transmitting the received signal to the receiver of the radar system; A plurality of phase shifters for properly adjusting and outputting a phase of a signal input through the power divider according to a control signal input from an outside, and controlling the phase shifters to adjust phases according to a direction in which beams are directed A beam steering computer for outputting a signal, a plurality of antennas for copying the signals output from each of the phase shifters into free space, and a plurality of end loads for exhausting the remaining signals from each of the antennas with heat; In the inspection method of a phased array antenna,

At the phase change time of the phase shifter in the radar starting state, the phase of any phase shifter is set as a phase for self-check, and the phases of the remaining phase shifters are calculated and set based on this phase to transmit and receive Performing radar functions while

When the transmission and reception are completed and the next phase state setting time is reached, maintaining the phase value of the arbitrary phase shifter in the current state, calculating and setting the phases of the remaining phase shifters based on this phase;

Outputting a check signal which is a signal having the same frequency as the transmission power at the transmitter of the radar system when the setting is completed;

Calculating and storing a phase value and a magnitude of a check signal input through the arbitrary phase shifter and the receiver;

When the saving is completed, at any phase change time of the next phase shifter, the phase of any phase shifter is set to another phase value for self-check, and the phases of the remaining phase shifters are calculated and set based on this phase. Performing radar functions while receiving;

When the transmission and reception are completed and the next phase state setting time is reached, maintaining the phase value of the arbitrary phase shifter in the current state, calculating and setting the phases of the remaining phase shifters based on this phase;

Outputting a check signal which is a signal having the same frequency as the transmission power at the transmitter of the radar system when the setting is completed;

Calculating and storing a phase value and a magnitude of a check signal input through the arbitrary phase shifter;

When the saving is completed, the phase value of any phase shifter and the magnitude of the random phase shifter are sequentially changed at the phase state change time of each next phase shifter as described above. After the storage is completed, analyzing the stored measured value to determine whether there is an abnormal phase shift in the measured value as much as the phase changed in the arbitrary phase shifter to determine whether there is an abnormal phase shifter,

If it is determined that any phase shifter is abnormal, it is determined that all phase shifters are normal by repeating sequentially for all phase shifters at each phase state setting time of the phase shifter which is periodically returned as described above. Characterized in that made.

Hereinafter, a configuration of a phased array antenna capable of self-check according to embodiments of the present invention will be described in detail with reference to FIGS. 1, 3, and 4. In FIG. 3 and FIG. 4, the same part as the phased array antenna shown in FIG. 1 is attached | subjected with the same code | symbol as FIG. 1, and the description is abbreviate | omitted.

First Embodiment

3 is a block diagram schematically illustrating a configuration of a phased array antenna capable of self-check according to the first embodiment of the present invention.

Referring to FIG. 3, the self-check circuit 100 of the phased array antenna 10 according to the first embodiment of the present invention includes a power divider 110, a switching unit 120, a self-check controller 130, , A power combiner 140 and a signal processor 150.

The power divider 110 separates and outputs a check signal input from the transmitter 1 of the radar system into a plurality of signals. Here, the check signal is a signal having a frequency equal to the transmission power supplied from the transmission unit 1 of the radar system, that is, the transmission frequency. Here, the power divider 110 is also preferably manufactured simply in a microstrip or strip structure because the power of the check signal is small.

The switching unit 120 includes a plurality of switches installed in each line of the power divider 110 and switched according to a control signal input from the outside to control the flow of the check signal output from the power divider 110.

The self-check controller 130 controls the switches of the switching unit 120 according to the self-check sequence. Here, the antenna 15 radiates electromagnetic waves in the self-check, but is a traveling wave antenna that serves to transmit the check signal to the phase shifter 13.

The power coupler 140 is installed between the antenna 15 and the termination load 16 and is a directional coupler that introduces a check signal supplied from the switching unit 120 into the antenna 15.

The signal processor 150 analyzes the radar signal and extracts target information, and controls the beam steering computer 14, the self-check controller 130, the phase shifter 13, and the transceiver of the radar system. Control all parts related to self-inspection. The signal processor 150 is a device including a signal processor and a controller in a general radar system.

Hereinafter, the operation of the self-checking phased array antenna according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 3.

First, at start-up of the radar system or when the radar system is stopped and in the self-checking state, the signal processor 150 outputs a control signal to the beam steering computer 14 to adjust the phase of the first phase shifter of the phase shifters 13. do. For example, set the first phase shifter to 0 °.

At the same time, the signal processor 150 outputs a control signal to the self-check controller 130 so that only the switch connected to the first phase shifter of the switching unit 120 is turned on by the self-check controller 130, and the transmitter of the radar system The control signal is output to (1) so that the check signal is output from the control signal.

The check signal is then distributed through the power divider 110 and input to the power combiner 140 through the first switch of the switching unit 120. The power combiner 140 transmits a check signal to the first of the antennas 15, and the transmitted signal is input to the first phase shifter through the first antenna, which in turn is the power divider 12 and the rotator 11. It is input to the signal processor 150 via. At this time, since the check signal passes through both the power divider 12, the power divider 110, the antenna 15, and the power combiner 140, the power loss of the check signal is large, but generally the reception sensitivity of the radar system is very high. Since it is low, the check signal input to the signal processor 150 may be sufficiently sensed by the signal processor 150.

On the other hand, the signal processor 150 receiving the signal calculates and stores the phase value and magnitude of the check signal, and when the storing is completed, the beam steering computer 14, the self check controller 130, and the transmitter of the radar system are again stored. Output the control signal to (1) and calculate and store the phase value and magnitude of the check signal while sequentially changing the phase of the first phase shifter (for example, 20 °, 40 °, 60 °… 360 °). After that, it is possible to determine whether the phase shifter 13 is abnormal by checking whether the phase of the signal measured by the signal processor 150 is changed by the phase difference changed by the phase shifter 13 through the stored value. Such a method may be sequentially applied to all phase shifters 13 to determine whether the phase shifters 13 are abnormal.

Second Embodiment

4 is a block diagram schematically illustrating a configuration of a phased array antenna capable of self-check according to a second embodiment of the present invention.

Referring to FIG. 4, the self-check circuit 200 of the phased array antenna 10 according to the second embodiment of the present invention includes a power divider 210, a switching unit 220, a self-check controller 230, , A power combiner 240 and a signal processor 250.

The power divider 210 separates and outputs a check signal input from the transmitter 1 of the radar system into a plurality of signals. Here, the check signal is a signal having a frequency equal to the transmission power supplied from the transmission unit 1 of the radar system, that is, the transmission frequency. Here also, the power divider 210 is preferably manufactured simply in a microstrip or strip structure because the power of the check signal is small.

The switching unit 220 includes a plurality of switches installed in each line of the power divider 210 and switched according to a control signal input from the outside to control the flow of the check signal output from the power divider 210.

The self check controller 230 controls the switches of the switching unit 220 according to the self check sequence. Here, the antenna 15 radiates electromagnetic waves in the self-check, but is a traveling wave antenna that serves to transmit the check signal to the phase shifter 13.

The power combiner 240 is installed between the phase shifter 13 and the antenna 15 and is a directional coupler that introduces a check signal supplied from the switching unit 220 into the phase shifter 13.

The signal processor 250 analyzes the radar signal and extracts target information, and controls the beam steering computer 14, the self-check controller 230, the phase shifter 13, and the transceiver of the radar system. Control all parts related to self-inspection. The signal processor 250 is a device including a signal processor and a controller in a general radar system.

Hereinafter, the operation of the self-check circuit of the phased array antenna according to the second embodiment of the present invention will be described in detail with reference to FIGS. 1 and 4.

The first and second embodiments of the present invention propose a self-checking method of a phased array antenna which is mainly performed at power-on in a radar system or in a state in which the radar system is temporarily stopped for self-checking of the antenna. It is also possible to carry out a self-check while the radar system is in operation. The following describes the self-check method during operation of the radar system.

First, in a radar system using a phased array antenna, the phase state of the phase shifter is periodically changed to change the angle of the beam, and it takes a certain time (about 100 ms) to change the phase state of the phase shifter.

Also, in the phased array antenna, the phase state of the phase shifters is important because the relative values between the phase shifters are important. Therefore, any one phase shifter among all the phase shifters is assigned an arbitrary value and based on the phase of the phase shifter. It is possible to determine the phase of another phase shifter. For example, if there are 20 phase shifters, and the 5th phase shifter, which is an arbitrary phase shifter, is set to 0 °, which is an arbitrary phase, in order to copy the beam in a state that is bent 30 ° to the left of the radar, the fourth phase is referred to The displacement of the phase shifter is -30 °, the third phase shifter is -60 °, whereas the sixth phase shifter is 30 ° and the seventh phase shifter 60 °.

Using this principle, an on-line self-check of the radar system can be performed.

First, at the time of changing the phase state of the phase shifter 13, the signal processor 250 controls the beam steering computer 14 to zero the phase of the first phase shifter of the phase shifter 13 for self-check. By setting ° as the phase, the beam steering computer 14 calculates and sets the phases of the remaining phase shifters 13 based on this phase. After the set time of the phase shifter 13, the radar function is performed while transmitting and receiving.

When the next phase state setting time comes, the signal processor 250 controls the beam steering computer 14 to maintain the phase value of the first phase shifter in the current state (0 °), and the beam steering computer 14 The phases of the remaining phase shifters 13 are calculated and set based on the phases. At the same time, by outputting a control signal to the self-check control unit 230, only the switch connected to the first phase shifter of the switching unit 220 in the self-check control unit 230 (on), and controlled by the transmitter 1 of the radar system The signal is output so that the check signal is output therefrom.

This check signal is then distributed through the power divider 210 and input to the power combiner 240 through the first switch. The power combiner 240 transmits the check signal to the first phase shifter, and the transmitted signal is input to the signal processor 250 via the power divider 12 and the rotor 11 again.

The signal processor 250 calculates and stores a phase value and a magnitude of the input check signal.

At the end of the phase shifter setup period, the radar will resume its normal radar function.

And at the time of changing the phase state of the next phase shifter, the signal processor 250 controls the beam steering computer 14 to check the phase of the first phase shifter for another phase value (eg 10 °) for self-checking. In this case, the beam steering computer 14 calculates and sets the phases of the remaining phase shifters based on this phase.

When the next phase shifter setting time comes, the signal processor 250 controls the beam steering computer 14 to maintain the phase value of the first phase shifter in the current state (10 °), and the beam steering computer 14 Calculate and set the phases of the remaining phase shifters based on this phase. At the same time, by outputting a control signal to the self-check control unit 230, only the switch connected to the first phase shifter of the switching unit in the self-check control unit 230 (on), and outputs the control signal to the transmitter 1 of the radar system From this, a check signal is output.

Then, the check signal is input to the signal processor 250 through the above process, and the signal processor 250 receiving the signal calculates and stores the phase value and magnitude of the check signal.

The signal processor 250 sequentially repeats the above steps every time the phase state of the phase shifter 13 is set, measures and stores all phase states of the first phase shifter, and analyzes the stored measured values. It is possible to determine whether there is an abnormality in the fifth phase shifter by checking whether there is the same amount of phase change in the measured value as much as the phase shifted in the phase shifter. Similarly, the above process is repeated every time the phase shifter phase state setting time is periodically returned. By sequentially repeating the n th phase shifters, it is possible to determine whether all phase shifters are normal.

Since the radar transceiver and signal processor are used for inspection of the antenna side including the phase shifter, there is no need to separate a part of the antenna or use other measurement equipment, and to input a signal to the antenna or phase shifter to receive a reception channel. By measuring the phase through the signal processor, it is possible to determine whether there is a problem in the entire path from the antenna side, the reception channel side, and the signal processing side at once.

In addition, since one channel is formed by using a switch, the signal flows through the antenna and the phase shifter passage, and thus, the phase value measured by the signal processor can be immediately known which phase shifter is affected. The phase and magnitude of the check signal can be compared with previously measured values to determine whether there are any abnormalities in the antenna side or other components on the receiving channel side besides the phase shifter of the channel.

In addition, the antenna side including the phase shifter, the receiving channel side, and the signal processing side can be grasped even during operation of the radar system, so that the radar system can be quickly coped with.

As described above, according to the self-checking circuit of the phased array antenna according to the present invention, the phase shifter and the phased array antenna are connected by using the transmitter of the radar itself, the phased array antenna, and the signal processor without removing the phase shifter from the antenna. By making it possible to determine whether there is an abnormality, it saves time, provides convenience to the measurer, and can actively cope with a failure.

Claims (7)

A rotor for transmitting the transmission power supplied from the transmitter of the radar system to the other side, and transmitting the received signal to the receiver of the radar system; A plurality of phase shifters for properly adjusting and outputting a phase of a signal input through the power divider according to a control signal input from an outside, and controlling the phase shifters to adjust phases according to a direction in which beams are directed A beam steering computer for outputting a signal, a plurality of antennas for copying the signals output from each of the phase shifters into free space, and a plurality of end loads for exhausting the remaining signals from each of the antennas with heat; A phased array antenna; Separating the check signal supplied from the transmitting unit of the radar system into a plurality of signals and input to any desired phase shifter to calculate the phase value and magnitude of the check signal input through this to determine whether the phase shifter is abnormal Self-checking phased array antenna comprising a self-check circuit. The method of claim 1, The self inspection circuit, A power divider for separating and outputting a check signal input from the outside into a plurality of signals; A switching unit provided in each line of the power distributor and switched according to a control signal input from the outside and having a plurality of switches to supply the check signal output from the power distributor to the other end; A self-check controller for generating and outputting a control signal to control the switching of the switching unit; A power combiner installed between the antenna and the termination load and configured to introduce a check signal supplied from the switching unit into the antenna; Outputs a control signal to the beam steering computer, the self-check controller and the transmitter of the radar system, and outputs a control signal through a specific switch connected to the switching unit, the antenna connected thereto, and a specific channel connected to the phase shifter connected thereto. After calculating the phase value and magnitude of the check signal input through the rotor and storing it sequentially, when the storage is completed, the phase of the measured signal is changed by the phase difference changed by the phase shifter through the stored value of the specific channel. And a signal processor for checking whether the phase shifter is abnormal by checking the phase shifter of each other channel again. The method of claim 1, The self inspection circuit, A power divider for separating and outputting a check signal input from the outside into a plurality of signals; A switching unit provided in each line of the power distributor and switched according to a control signal input from the outside and having a plurality of switches to supply the check signal output from the power distributor to the other end; A self-check controller for generating and outputting a control signal to control the switching of the switching unit; A power combiner installed between the phase shifter and the antenna and introducing a check signal supplied from the switching unit to the phase shifter; Outputs a control signal to the beam steering computer to vary the phase of the phase shifter to be checked, and in this state, the phase of the other phase shifter is adjusted based on the phase shifter whose phase value is varied so that the radar is operated. At the time of changing the direction of the radar beam during the operation of the radar system, the control unit outputs a control signal to the transmitter of the radar system and the self-checking controller to switch on the switching unit connected to the phase shifter to be checked and thereby the power divider. And a signal processor which determines whether there is an abnormality of the phase processor by sequentially calculating whether the measured value is changed by the phase difference changed by the phase shifter by calculating the phase value and magnitude of the check signal input through the rotor. Self-point, characterized in that it comprises a The phased array antenna as possible. The method of claim 2 or 3, The check signal, A signal of the same frequency as the transmission power supplied from the transmission unit of the radar system, Self-checking phased array antenna which is supplied from the transmitter of the radar system. The method of claim 2 or 3, The power splitter, Self-checking phased array antenna comprising a microstrip or strip structure. A rotor for transmitting the transmission power supplied from the transmitter of the radar system to the other side, and transmitting the received signal to the receiver of the radar system; A plurality of phase shifters for properly adjusting and outputting a phase of a signal input through the power divider according to a control signal input from an outside, and controlling the phase shifters to adjust phases according to a direction in which beams are directed A beam steering computer for outputting a signal, a plurality of antennas for copying the signals output from each of the phase shifters into free space, and a plurality of end loads for exhausting the remaining signals from each of the antennas with heat; In the inspection method of a phased array antenna, Adjusting the phase of any phase shifter at the start of the radar system or by stopping the operation of the radar system and checking itself; Outputting a check signal that is a signal of the same frequency as the transmission power at the transmitting unit of the radar system only to the antenna connected to the arbitrary phase shifter when the phase of the arbitrary phase shifter is adjusted; Calculating and storing a phase value and a magnitude of a check signal input through the antenna, an arbitrary phase shifter and a receiver; Comprising the phase of the arbitrary phase shifter when the storage is completed, calculating the phase value and magnitude of the check signal and storing it; Determining whether the phase of the measured signal is changed by the phase difference that is changed by the arbitrary phase shifter through the stored values when all of the measured values of the arbitrary phase shifter are completed; If it is determined that any phase shifter is abnormal, the step of determining whether or not all phase shifter is abnormal, the method of the self-checking phased array antenna, characterized in that consisting of. A rotor for transmitting the transmission power supplied from the transmitter of the radar system to the other side, and transmitting the received signal to the receiver of the radar system; A plurality of phase shifters for properly adjusting and outputting a phase of a signal input through the power divider according to a control signal input from an outside, and controlling the phase shifters to adjust phases according to a direction in which beams are directed A beam steering computer for outputting a signal, a plurality of antennas for copying the signals output from each of the phase shifters into free space, and a plurality of end loads for exhausting the remaining signals from each of the antennas with heat; In the inspection method of a phased array antenna, At the phase change time of the phase shifter in the radar starting state, the phase of any phase shifter is set as a phase for self-check, and the phases of the remaining phase shifters are calculated and set based on this phase to transmit and receive Performing radar functions while When the transmission and reception are completed and the next phase state setting time is reached, maintaining the phase value of the arbitrary phase shifter in the current state, calculating and setting the phases of the remaining phase shifters based on this phase; Outputting a check signal which is a signal having the same frequency as the transmission power at the transmitter of the radar system when the setting is completed; Calculating and storing a phase value and a magnitude of a check signal input through the arbitrary phase shifter and the receiver; When the saving is completed, at any phase change time of the next phase shifter, the phase of any phase shifter is set to another phase value for self-check, and the phases of the remaining phase shifters are calculated and set based on this phase. Performing radar functions while receiving; When the transmission and reception are completed and the next phase state setting time is reached, maintaining the phase value of the arbitrary phase shifter in the current state, calculating and setting the phases of the remaining phase shifters based on this phase; Outputting a check signal which is a signal having the same frequency as the transmission power at the transmitter of the radar system when the setting is completed; Calculating and storing a phase value and a magnitude of a check signal input through the arbitrary phase shifter; When the saving is completed, the phase value of any phase shifter and the magnitude of the random phase shifter are sequentially changed at the phase state change time of each next phase shifter as described above. After the storage is completed, analyzing the stored measured value to determine whether there is an abnormal phase shift in the measured value as much as the phase changed in the arbitrary phase shifter to determine whether there is an abnormal phase shifter, If it is determined that any phase shifter is abnormal, it is determined that all phase shifters are normal by repeating sequentially for all phase shifters at each phase state setting time of the phase shifter which is periodically returned as described above. A method of inspecting a self-checking phased array antenna, characterized in that made.