KR101295756B1 - A system of analyzing radar using digital spectrum and a method thereof - Google Patents

Abstract

PURPOSE: A radar analysis system and method using a digital spectrum are provided to easily check the abnormality of equipment in a remote location. CONSTITUTION: A radar analysis system comprises a digital control assembly (110) and a transceiver (120). The digital control assembly generates a digital signal according to a control signal which is inputted from a signal processing unit (210) and converts the digital signal into a radio frequency (RF) signal and outputs it. The digital control assembly checks a normal operation of the radar analysis system. The digital control assembly comprises a field programmable gate array (FPGA) (110-3). The FPGA checks the abnormality of the digital control assembly or the transceiver by analyzing a spectrum of a signal which is transferred from the transceiver. The transceiver transmits the RF signal in which the digital control assembly outputs to an antenna (220) and selectively delivers a signal generated in the digital control assembly or a test signal generator (212) to the digital control assembly according to the control of the signal processing unit. [Reference numerals] (100) Analysis system; (110) Digital control assembly; (110-1) Light signal transceiving module; (110-6) Clock processing module; (120) Transceiver; (120-1) Transmitting assembly; (120-10) H receiving assembly; (120-11) V receiving assembly; (120-12) Frequency synthesis assembly; (120-3) Coupler; (120-5) Distributor; (120-8) H receiving front assembly; (120-9) V receiving front assembly; (210) Signal processing unit; (220) Antenna

Description

Radar analysis system and analysis method using digital spectrum {A SYSTEM OF ANALYZING RADAR USING DIGITAL SPECTRUM AND A METHOD THEREOF}

The present invention relates to a radar analysis system and analysis method using a digital spectrum, and more particularly, to analyze a digital spectrum by looping back a signal transmitted through an antenna in a radar system or inputting a signal transmitted from a separate signal generator. The present invention relates to a radar analysis system and analysis method using a digital spectrum to determine whether the radar system is operating normally.

The radar system is a device for identifying an aircraft, a cloud, or an animal. The radar system transmits an RF signal through an antenna to measure the state of the object, and analyzes the RF signal reflected from the object, and locates the object. Know your speed, direction of travel, and more.

The radar system includes a device for generating a digital signal, a device for converting a digital signal into an RF signal, and a device for adjusting the output of the RF signal and transmitting the same through an antenna.

Individual devices include devices that perform functions such as signal conversion, output conversion, and signal synthesis. Each device must be operating normally for the radar system to properly identify an object.

In order to analyze whether each device operates normally in a radar system, techniques for comparing signal output and quality by bypassing a signal transmitted through an antenna and a signal transmitted to the antenna with a loop-back path have been disclosed. .

1 is a block diagram showing the structure of a noise measurement system according to an embodiment of the prior art.

1 shows an improved noise measurement system 1 for measuring the noise added to the carrier signal 39 by the test unit 3. The test unit 3 comprises an input 4 for receiving the low noise carrier signal 39 transmitted from the noise measurement system 1 via the output port 7. The test unit 3 modulates, amplifies or adjusts the carrier signal 3 and outputs a UUT signal 35 from one output port 5. The UUT signal 35 is received by the measurement test system output port 6 where it is sent through a variable amplifier 15 having one input port 17 and one output port 19. After being sent through the variable amplifier 15, the UUT signal 35 is received by the mixer 21 via the first mixer input 23.

The noise measurement system 1 comprises a variable low noise source 9 which generates a low noise carrier signal 39 provided to a test unit. The low noise source also provides a second low noise signal 37 having the same frequency as in the carrier signal 39, which is provided through the output port 13. A second low noise signal 37 is then sent to the variable phase shifter 29 via one input port 31, where its phase is adjusted and output through the output port 33. After the phase is adjusted by the variable mover 29, a second low noise signal 37 is sent to the mixer 21 through the input port 25.

The variable phase shifter 29 adjusts the phase of the second low noise signal 37 to have a phase difference of 90 degrees with the UUT signal 35 when received by the mixer 11. In addition, the variable amplifier 15 can be adjusted to amplify the UUT signal 35 so as to have an amplitude that matches the amplitude of the second low noise signal 37 when received by the mixer 21. The mixer 21 combines the UUT signal 35 and the second low noise signal 37 so that the signals can have a phase difference of 90 degrees. Assuming that there is negligible noise in the variable amplifier 15, the variable low noise source 9, the variable phase shifter 29 and the mixer 21, the output signal referred to as the test signal of the test unit 3 Indicates noise This measurement test signal 41 is then routed through the input 45 and output 47 of the low noise matched amplifier 43.

The low noise matching amplifier 43 amplifies the amplitude of the measurement test signal 41 so that any noise in the test signal can be more easily measured. The low noise match amplifier 43 also acts as a buffer, optimally between the analog-to-digital converter 49 receiving the measurement test signal 41 after the impedance is routed through the mixer 21 and the low noise match amplifier 43. To be maintained.

The analog-to-digital converter 49 has one input port 51 to receive the measurement test signal 41.

After being received by the analog-to-digital converter 49, the measurement test signal 41 is converted into a digital format in an elective manner and then output through the output port 53. Measurement test signal 41, now in digital format, is sent to processor 55 through input port 57. The processor 55 performs various evaluations of the measurement test signal 41 and sends the signal unchanged through the input port 59 to the spectrum analyzer 61 having the input port 63.

In the prior art, there is no information on how to process the signal sent to the spectrum analyzer 61, and since the signal generated in the test unit 3 is used as the signal to be analyzed, the actual radar system is in operation. There was a problem that can be different from the generated signal.

KR 10-2002-0044109 A

The present invention for solving the above-mentioned problem is an apparatus existing in the transmission and reception path of the signal by looping back and analyzing any one of the signal transmitted from the radar system, the CW signal generated from the FPGA, the signal generated from the test signal generator An object of the present invention is to provide a radar analysis system and analysis method using a digital spectrum that can check whether there is a problem.

In addition, an object of the present invention is to provide a radar analysis system and analysis method using a digital spectrum to move the signal to the frequency to be analyzed by using a frequency synthesizer to enable the signal analysis in the loop back signal. .

The present invention devised to solve the above problems is a system for analyzing the state of the radar system for measuring the target object, generating a digital signal in accordance with the control signal input from the signal processing unit 210, and the digital signal A digital control assembly (110) converting and outputting an analog RF signal and determining whether the radar system is operating normally; The RF signal output from the digital control assembly 110 is transmitted to the antenna 220, and according to the control of the signal processor 210, the digital control assembly 110 or TSG (Test Signal Generator, test signal generator); And a transmitter / receiver 120 for selectively transmitting a signal generated from the digital control assembly 110 to the digital control assembly 110. The digital control assembly 110 generates the digital signal and transmits the signal from the transceiver 120. Characterized by analyzing the spectrum of the signal to be characterized in that it comprises an FPGA (110-3) for checking the abnormality of the digital control assembly 110 and the transceiver 120.

The FPGA 110-3 may convert a digital IF signal converted by an analog to digital converter (ADC) 110-5 into a horizontal baseband signal including an in-phase signal and a quadrature-phase signal. First and second mixers 110-3a and 110-3b respectively converting the vertical baseband signals; A first CIC filter 110-3d and a second CIC filter 110- separating the wideband signals output from the first mixer 110-3a and the second mixer 110-3b into signals of a specific band to be subjected to spectrum analysis. 3e); A first RBW filter (110-3f) and a second RBW filter (110-3g) which leave only the signal waveform of a specific frequency region to be subjected to the spectrum analysis and remove the rest; And a VBW filter (110-3i) for visually and smoothly converting the signal passing through the first RBW filter (110-3f) and the second RBW filter (110-3g).

The transceiver 120 is connected to the output of the two contactor coupler (120-3) and the TSG (212) on the left, respectively, the first contact is connected to the input terminal of the distributor (120-5) 120-4; The two contacts on the right side are respectively connected to the output terminals of the antenna 220 and the distributor 120-5, and the contacts on the left side are connected to the H receiving front end assembly 120-8 to transfer the horizontal signal. (120-6); The two contacts on the right side are connected to the output terminals of the antenna 220 and the distributor 120-5, respectively, and the contacts on the left side are connected to the V receiving front end assembly 120-9 to transfer the vertical signal. (120-7);

According to another exemplary embodiment of the present invention, a method for analyzing a state of a radar system for measuring a target is used. In order to analyze a state of the radar system, a signal generated from the digital control assembly 110 is used or TSG ( A first step in which the signal processing unit 210 determines whether to use a signal generated from 212; A second step of bypassing a signal generated from the digital control assembly 110 or a signal generated from the TSG 212 through a loopback path inside the transceiver 120 to the digital control assembly 110; And a third step of the FPGA 110-3 analyzing the spectrum of the signal transmitted from the transceiver 120 to confirm whether the digital control assembly 110 and the transceiver 120 are abnormal.

In the third step, the first IF 110-3a and the second mixer 110-3b included in the FPGA 110-3 are converted into digital IFs by an analog to digital converter 110-5. A step 3-1 converting the signal into a horizontal baseband signal and a vertical baseband signal each including an in-phase signal and a quadrature-phase signal; A specific band in which the first CIC filter 110-3d and the second CIC filter 110-3e are the spectrum analysis targets for the wideband signals output from the first mixer 110-3a and the second mixer 110-3b. Step 3-2 to separate the signal of; Steps 3-3, in which the first RBW filter 110-3f and the second RBW filter 110-3g remove only the signal waveforms of the specific frequency region to be subjected to the spectrum analysis and remove the rest; And (3-4) the VBW filter 110-3i visually and smoothly converting the signal passing through the first RBW filter 110-3f and the second RBW filter 110-3g.

According to the present invention, it is possible to easily check whether there is an abnormality of the equipment of the radar system at a remote location, and it is possible to analyze the spectrum of the signal input and output through the transceiver, and to perform a spurious signal in or out of the use band of the actual radar transceiver equipment. There is an effect that can be analyzed.

1 is a block diagram showing the structure of a noise measurement system according to an embodiment of the prior art.
Figure 2 is a block diagram showing the configuration and connection of the analysis system according to an embodiment of the present invention.
Figure 3 is a block diagram showing the internal structure and the connection state of the FPGA.
Figure 4 is a flow chart showing the process of the radar analysis method using the analysis system of the present invention.
5 is a graph showing a waveform of an IF signal transmitted from a transceiver.
6 is a graph showing waveforms of IF signals converted to digital signals.
7 is a graph showing a waveform of a baseband signal including an I signal and a Q signal.
8 is a graph showing waveforms of narrowband signals separated from baseband signals.
9 is a graph showing waveforms of spectral signals separated in more detail by an RBW filter.
Fig. 10 is a graph showing waveforms of spectral signals with increased smoothness by VBW filters.

Hereinafter, a "radar analysis system and analysis method using a digital spectrum" according to an embodiment of the present invention will be described.

Figure 2 is a block diagram showing the configuration and connection state of the analysis system according to an embodiment of the present invention, Figure 3 is a block diagram showing the internal structure and connection state of the FPGA.

The "radar analysis system using a digital spectrum" (hereinafter referred to as an "analysis system") of the present invention generates a signal output through the antenna 220 in the radar system, the presence and movement of the detected object from the received signal It is connected to the signal processor 210 for grasping information. The analysis system 100 is connected to the signal processor 210 with an optical cable to output a radar signal under the control of the signal processor 210, and analyzes the signal reflected by the antenna 220 to be input to the analysis system 100. Check for abnormalities in the devices included in the system.

The signal processor 210 analyzes the measurement data included in the RF signal received and transmitted by the antenna 220 to determine the weather state or the position of the moving object in a specific region, and analyzes the measured data of the detected object as an image signal. Convert to and provide

The digital control assembly 110 included in the analysis system 100 generates an RF signal according to a control signal input from the signal processor 210 and transmits the RF signal to the transceiver 120. The transceiver 120 transmits a transmission signal to be radiated to an object to be monitored through the antenna 220 or receives a received signal reflected from the object to be transmitted to the digital control assembly 110.

The optical signal transmission / reception module 110-1 included in the digital control assembly 110 is connected to the signal processing unit 210 through an optical path, and is detected through a control signal and an antenna 220 related to the operation of the radar system. Send and receive measurement data for.

The CPU 110-2 controls the operation of the components included in the digital control assembly 110 and the signal conversion process in each process.

The field programmable gate array (FPGA) 110-3 outputs a transmission signal to be emitted to the target object according to the control signal of the signal processor 210, and analyzes the spectrum of the loopback signal input from the transceiver 120 to radar. It checks whether the components of the system are operating normally. In addition, the FPGA 110-3 may generate and output a CW (Continuous Wave) signal that is a reference for spectrum analysis.

A digital to analog converter (DAC) 110-4 converts a digital signal generated from the FPGA 110-3 into an intermediate frequency (IF) signal and transmits the digital signal to the transceiver 120. In addition, an analog to digital converter (ADC) 110-5 converts an analog IF signal into a digital signal and delivers the digital signal to the FPGA 110-3.

The RF signal generated by the digital control assembly 110 is transmitted to the antenna 220 via the transmission assembly 120-1 and the high output amplifier (SSPA 120-2). The transmission signal (RF signal) whose output is amplified by the SSPA 120-2 is radiated through the antenna 220 and transmitted to a target object such as a target object.

The frequency synthesis assembly 120-12 outputs a local oscillation signal. A thermostat controlled crystal oscillator (OCXO) or the like may be included in the frequency synthesis assembly 120-12 to output the local oscillation signal. The local oscillation signal output by the frequency synthesis assembly 120-12 is transmitted to the clock processing module 110-6 to be used for generating synchronization information.

A coupler 120-3 is installed between the SSPA 120-2 and the antenna 220. The coupler 120-3 branches a portion of the signal transmitted to the antenna 220 to bypass the signal in the loopback path. Guide them to do so.

The signal branched from the coupler 120-3 is transmitted to the distributor 120-5 via the first switch 120-4. The TSG (Test Signal Generator) 212 is connected to the first switch 120-4. The two contacts on the left side of the first switch 120-4 are connected to the output terminals of the coupler 120-3 and the TSG 212, respectively, and the contacts on the right side are connected to the input terminals of the distributor 120-5. By switching operation of the first switch 120-4, the distributor 120-5 is selectively connected to the coupler 120-3 or the TSG 212 to generate the radar transmission signal or the TSG generated by the FPGA 110-3. The test signal generated by 212 is transmitted to the distributor 120-5.

The divider 120-5 separates the horizontal RF signal and the vertical RF signal from the input signal and outputs the split RF signal.

The H receiving shear assembly 120-8 and the V receiving shear assembly 120-9 receive the horizontal RF signal and the vertical RF signal input from the antenna 220, respectively, and amplify the output. The amplified RF signal is transmitted to the H receiving assembly 120-10 and the V receiving assembly 120-11, respectively. The H receiving assembly 120-10 and the V receiving assembly 120-11 are the frequency synthesis assembly 120. The IF signal is output by down-converting the horizontal RF signal and the vertical RF signal using the local oscillation signal input from -12).

In the case of meteorological radar, a large target object (cloud, etc.) is measured, so the horizontal signal and the vertical signal are separated and analyzed, but military and marine radars have relatively small size such as airplanes, missiles, and ships. Since the detector is monitored, the horizontal and vertical signals are not distinguished and analyzed. Therefore, if the weather radar is not divided into the H receiving assembly (120-10) and the V receiving assembly (120-11), the combined 'receiving assembly' is used to output the IF signal.

Hereinafter, the term 'receive shear assembly' or 'receive assembly' used in the description of the present invention refers to the H-receiver shear assembly 120-8 and the V-receiver shear assembly 120-9 and the H-receive assembly 120-10. Means a module combining the V receiving assembly 120-11, respectively.

The converted IF signals output by the reception assemblies 120-10 and 120-11 are converted into digital signals by the ADC 110-5 and transmitted to the FPGA 110-3.

The second switch 120-6 and the third switch 120-7 are connected between the distributor 120-5 and the receiving shear assemblies 120-8, 120, and 9.

The two contacts on the right side of the second switch 120-6 are connected to the output terminals of the antenna 220 and the distributor 120-5, respectively, and the contacts on the left side are connected to the H receiving shear assembly 120-8. . The two contacts on the right side of the third switch 120-7 are connected to the output terminals of the antenna 220 and the distributor 120-5, respectively, and the contacts on the left side are connected to the V receiver front end assembly 120-9. do. By the switching operation of the second switch 120-6 and the third switch 120-7, the H receiving shear assembly 120-8 and the V receiving shear assembly 120-9 are respectively an antenna 220 or a distributor ( 120-5) to selectively receive a signal from the antenna 220 or the distributor 120-5.

The first switch 120-4, the second switch 120-6, and the third switch 120-7 perform a switching operation under the control of the signal processing unit 210 or the CPU 110-2 to transmit the transmission signal. The loopback routing of transmissions and signals takes place alternately.

On the other hand, the FPGA (110-3) is to move the frequency of the digital signal from the ADC (110-5) in accordance with the reference signal, and to reduce the bandwidth to easily separate the spectrum of the signal.

Digital spectrum analysis replaces the analog components of the Swept spectrum analyzer with digital components. The core technology of digital spectrum analysis is DDC (Digital Down Conversion).

The DDC described in the present invention refers to a block for digitally processing an IF signal, and this DDC technique is a mixer and a low-pass filter (LPF) in the digital domain after analog / digital conversion of the IF signal. Use to change to baseband signal. The LPF is designed with an efficient serial connection structure and also performs the function of the Decimation Filter, which gradually reduces the sampling rate.

3 illustrates components of the FPGA 110-3, which are Cascaded Integrator-Comb (CIC) filters 110-3d and 110-3e and Resolution BandWidth (RBW) filters 110-3f and 110-3g. Performs the staged function of the lowpass filter.

The first mixer 110-3a and the second mixer 110-3b are sampled and input signals generated from the digital format IF signals (horizontal signals and vertical signals) and DDS (Digital Sine Synthesizer; 110-3c). The mixture is converted into a baseband signal (composed of a horizontal baseband signal and a vertical baseband signal) including an I (In-phase) signal and a Q (Quadrature-phase) signal.

The first CIC filter 110-3d and the second CIC filter 110-3e, which function as the first stage of the LPF, are simple filters that can be implemented by an adder without the need for a multiplier. Useful for separating

The first RBW filter 110-3f and the second RBW filter 110-3g in the next stage are filters that further narrowly narrow the narrowband signal filtered through the CIC filters 110-3d and 110-3e. Filter by dividing the band of. The shape of the output spectrum and the measurement time depend on the RBW.

The power measuring unit 110-3h measures the output of the narrowband signal passing through the RBW filters 110-3f and 110-3g, and outputs the outputs of the I and Q signals, which are elements of the complex signal, respectively. Can be obtained by adding the squares. In the present invention, the power measuring unit 110-3h measures the output of a signal belonging to a bandwidth of approximately 30 Hz.

The VBW (Video BandWidth) filter 110-3i visually corrects the spectrum of the signal passing through the LPF so that the waveform is more smoothly expressed.

On the other hand, Figure 4 is a flow chart showing the process of the radar analysis method using the analysis system of the present invention. Referring to Figures 1 to 4 will be described step by step the operation of the analysis system 100 of the present invention.

The signal processing unit 210 or the CPU 110-2 radiates a transmission signal through the antenna 220 of the radar system, and when a specific event occurs in the process of determining the position of the object to be detected, the radar system The start of signal analysis is determined to determine whether it is operating normally.

According to the control of the signal processor 210, it is determined whether the digital control assembly 110 analyzes using the generated signal or whether the signal generated from the TSG 212 is used (S102).

Three switches included in the transceiver 120 are switched in an appropriate manner according to the decision of the signal processor 210 to determine the input path of the signal.

When using a transmission signal (a signal radiated to the detector) or a CW signal generated in the FPGA 110-3, the left contact of the first switch 120-4 is connected to the output terminal of the coupler 120-3. . If the signal generated by the TSG 212 is used, the left contact of the first switch 120-4 will be switched to be connected to the output terminal of the TSG 212.

The right contact point of the second switch 120-6 and the third switch 120-7 is normally connected to the antenna 220 during normal radar system operation. The switch is switched to form a loopback path for signal analysis. Are respectively connected to the output terminals of 120-5. Therefore, the signal generated from the FPGA 110-3 is transmitted to the transmission assembly 120-1, the SSPA 120-2, the coupler 120-3, the first switch 120-4, the divider 120-5, Passed through the second switch (120-6) and the third switch (120-7) is input to the receiving shear assembly (120-8, 120-9). This signal is converted into an IF signal and delivered to the ADC 110-5 via the receiving assemblies 120-10 and 120-11.

5 is a graph showing waveforms of IF signals transmitted from a transceiver.

The ADC 110-5 converts the received IF signal into a digital signal and inputs it to the FPGA 110-3. (S106) FIG. 6 is a graph showing the waveform of an IF signal converted into a digital signal. The waveform of the signal from the output terminal of -5) is shown.

The digital IF signal is converted into a horizontal baseband signal and a vertical baseband signal while passing through the first mixer 110-3a and the second mixer 110-3b while the horizontal signal and the vertical signal are separated. FIG. 7 is a graph showing a waveform of a baseband signal including an I signal and a Q signal, and shows a waveform of a signal coming from the output terminals of the first mixer 110-3a and the second mixer 110-3b.

The signals input to the first CIC filter 110-3d and the second CIC filter 110-3e are wideband signals, from which signals of a specific band to be subjected to spectrum analysis are separated. (S110) FIG. 8 shows a baseband signal. A graph showing the waveform of the narrowband signal separated from the graph shows the waveform of the signal coming from the output terminals of the first CIC filter 110-3d and the second CIC filter 110-3e.

Narrow-band signals input to the first RBW filter 110-3f and the second RBW filter 110-3g remain only the signal waveform of a specific frequency domain to be subjected to spectrum analysis, and the rest are removed. (S112) FIG. 9 shows the RBW filter. This is a graph showing the waveforms of the spectral signals separated in more detail by using the waveforms of the signals from the output stages of the first RBW filter 110-3f and the second RBW filter 110-3g.

The signals output from the first RBW filter 110-3f and the second RBW filter 110-3g are transmitted to the power measuring unit 110-3h to measure characteristics including the output of the signal (S114) and the VBW filter ( 110-3i) to convert visually and smoothly. 10 is a graph showing waveforms of spectral signals with increased smoothness by the VBW filter.

By analyzing the spectrum of the finally converted signal as shown in Figure 10 can be measured the power (power), gain (gain), spurious (spurious), etc. of the signal to be compared to the signal transmitted through the radar system Additionally, functions such as Sensitivity Time Control (STC), Auto Gain Control (AGC), and Auto Level Control (ALC) can also be confirmed using the analysis system 100 of the present invention.

The characteristics of the CW signal generated in the FPGA (110-3) is maintained constant, the signal transmitted through the antenna 220 and the signal received through the loopback path is transformed while passing through each module in the operation of the actual equipment In this state, it is possible to check whether there is an error in the devices belonging to the transceiver 120 by applying gains already known on the transmit / receive path.

In addition, whether there is an abnormality in the characteristics and specifications of the analyzed signal can be confirmed through its own graphical user interface (GUI), and by using the optical interface to the signal processing unit 210 can be remotely confirmed whether there is an abnormality.

In addition, by using the TSG 212 or by adding a gain control function on the transmission path, there is an effect that can be used for calibration of the reception path of the transceiver 120.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, As will be understood by those skilled in the art. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

100: analysis system 110: digital control assembly
110-1: Optical signal transmission module 110-2: CPU
110-3: FPGA 110-4: DAC
110-5: ADC 110-6: Clock Processing Module
120: transceiver 120-1: transmission assembly
120-2: SSPA 120-3: Coupler
120-4: first switch 120-5: distributor
120-6: second switch 120-7: third switch
120-8: H-receiver shear assembly 120-9: V-receiver shear assembly
120-10: H receiving assembly 120-11: V receiving assembly
120-12: frequency synthesis assembly 210: signal processing unit
212: TSG 220: antenna

Claims (5)

A system that analyzes the state of a radar system measuring an object,
A digital control assembly (110) generating a digital signal according to a control signal input from the signal processing unit (210), converting the digital signal into an analog RF signal, and outputting the digital signal, and determining whether the radar system is operating normally;
The RF signal output from the digital control assembly 110 is transmitted to the antenna 220, and according to the control of the signal processor 210, the digital control assembly 110 or TSG (Test Signal Generator, test signal generator); It includes a transceiver 120 for selectively transmitting a signal generated in the) to the digital control assembly 110,
The digital control assembly 110 is
Generating the digital signal, and analyzing the spectrum of the signal transmitted from the transceiver 120 includes an FPGA (110-3) for checking the abnormality of the digital control assembly 110 and the transceiver 120. ,
The transceiver 120 is
The two contacts on the left side are respectively connected to the output terminal of the coupler 120-3 and the TSG 212, and the contacts on the right side of the first switch 120-4 are connected to the input terminal of the distributor 120-5;
The two contacts on the right side are respectively connected to the output terminals of the antenna 220 and the distributor 120-5, and the contacts on the left side are connected to the H receiving front end assembly 120-8 to transfer the horizontal signal. (120-6);
The two contacts on the right side are connected to the output terminals of the antenna 220 and the distributor 120-5, respectively, and the contacts on the left side are connected to the V receiving front end assembly 120-9 to transfer the vertical signal. Radar analysis system using a digital spectrum, characterized in that it comprises a (120-7). The method of claim 1,
The FPGA 110-3
Converting the digital IF signal converted by the ADC (Analog to Digital converter; 110-5) into a horizontal baseband signal and a vertical baseband signal including an I (In-phase) signal and a Q (Quadrature-phase) signal, respectively. A first mixer 110-3a and a second mixer 110-3b;
A first CIC filter 110-3d and a second CIC filter 110- separating the wideband signals output from the first mixer 110-3a and the second mixer 110-3b into signals of a specific band to be subjected to spectrum analysis. 3e);
A first RBW filter (110-3f) and a second RBW filter (110-3g) which leave only the signal waveform of a specific frequency region to be subjected to the spectrum analysis and remove the rest;
And a VBW filter (110-3i) for visually and smoothly converting a signal passing through the first RBW filter (110-3f) and the second RBW filter (110-3g). delete A method of analyzing the state of a radar system measuring an object,
A first step of the signal processor 210 determining whether to use a signal generated from the digital control assembly 110 or a signal generated from the TSG 212 to analyze the state of the radar system;
A second step of bypassing a signal generated from the digital control assembly 110 or a signal generated from the TSG 212 through a loopback path inside the transceiver 120 to the digital control assembly 110;
And a third step of the FPGA 110-3 analyzing the spectrum of the signal transmitted from the transceiver 120 to confirm whether the digital control assembly 110 and the transceiver 120 are abnormal.
The third step is
The first mixer 110-3a and the second mixer 110-3b included in the FPGA 110-3 convert the digital IF signal converted by the ADC (Analog to Digital converter; 110-5) into I (In step 3-1 converting the horizontal baseband signal and the vertical baseband signal including a -phase) signal and a quadrature-phase (Q) signal, respectively;
A specific band in which the first CIC filter 110-3d and the second CIC filter 110-3e are the spectrum analysis targets for the wideband signals output from the first mixer 110-3a and the second mixer 110-3b. Step 3-2 to separate the signal of;
Steps 3-3, in which the first RBW filter 110-3f and the second RBW filter 110-3g remove only the signal waveforms of the specific frequency region to be subjected to the spectrum analysis and remove the rest;
And a step 3-4 in which the VBW filter 110-3i visually and smoothly converts the signal passing through the first RBW filter 110-3f and the second RBW filter 110-3g. Radar analysis method using the. delete

Images