KR20180125297A - Antenna radiation pattern measurement system using frequency modulated continuous wave and method thereof - Google Patents

Abstract

The present invention relates to a system for measuring an antenna radiation pattern corresponding to a chirp bandwidth by dividing line of sight (LOS) signals based on an analysis of a bit frequency and a Doppler frequency in a reverberation chamber, and an operation method thereof. The LOS signal and a non-LOS (NLOS) signal can be accurately divided by using the Doppler frequency and the bit frequency, and a radiation pattern in all frequencies within a bandwidth can be measured by measuring a chirp one time.

Description

TECHNICAL FIELD [0001] The present invention relates to an antenna radiation pattern measurement system using a frequency-modulated continuous wave,

The present invention relates to an antenna radiation pattern measurement system using a frequency-modulated continuous wave and a method of operating the same, and more particularly, to a method and apparatus for measuring an LOS (Line of Sight) signal based on Doppler frequency and bit frequency analysis in a reverberation chamber And an antenna radiation pattern corresponding to the chirp bandwidth. The present invention relates to a technique for measuring an antenna radiation pattern corresponding to a chirp bandwidth.

The initial electromagnetic wave reverberation room started as a research space for measuring electromagnetic interference. Since the inside of the electromagnetic wave reverberation chamber has a uniform and isotropic field and has a characteristic of Rayleigh distribution, it is possible to use a real NLOS (None Line of Sight) mobile communication environment in which fading occurs similar.

Because of this characteristic, we have recently conducted many studies related to antenna parameter measurement, considering that the antenna is in the actual fading environment in the laboratory. In addition, since the above-mentioned characteristics and the electromagnetic wave reverberation chamber are lower in price than the electromagnetic anechoic chamber (AC), a lot of research is underway to replace them.

However, since a general electromagnetic wave reverberation chamber has walls all of which are conductors, when a wave is inserted, the conductor is reflected by various paths to form a multipath environment. The signal coming through the receiving antenna inside the electromagnetic wave reverberation chamber comes in a signal passing through various paths, and there is a limit in that it is very difficult to distinguish the LOS (Line of Sight) signal from the NLOS signal in this environment.

In order to overcome these limitations, recently, a measurement method relating to a radiation pattern among antenna parameters is required.

Continuous wave (CW) and Doppler frequency were the main methods. In a multipath environment, different LOS and NLOS signals are distinguished from each other by using different Doppler frequencies based on signals received at certain angles to a moving receiving antenna.

However, this conventional method has a problem that it takes much time to measure one frequency as compared with the time measured in the anechoic chamber (AC).

In order to solve this problem, the present invention provides a method and apparatus for classifying an LOS signal and an NLOS signal using a Frequency Modulated Continuous Wave (FMCW) system and measuring an antenna radiation pattern from the separated LOS signal Technology.

The FMCW system generates a chirp of a frequency sweep in a corresponding band by using a direct digital synthesizer (DDS), sends the chirp through a transmitting antenna, and receives the chirp through a receiving antenna. Such an FMCW system has been required to measure an antenna radiation pattern corresponding to a sweep band width.

Korean Patent Publication No. 1020150049070 (published May 5, 2015), "FMCW radar using IQ demodulator and method of operation thereof" Korean Registered Patent No. 101110025 (registered on January 19, 2012), "FMCW radar signal processing method"

Previously, it was possible to measure the antenna parameter in the reverberation chamber, but there was a limit to the measurement part of the radiation pattern.

It is an object of the present invention to overcome the limitations of the existing methods to distinguish LOS signals in an electromagnetic wave reverberation chamber using an FMCW system and to measure antenna radiation patterns in a frequency band corresponding to a sweep band width And a method of operating the antenna radiation pattern measurement system using the frequency-modulated continuous wave.

It is also an object of the present invention to provide an antenna radiation pattern measurement system using frequency-modulated continuous waves capable of distinguishing LOS signals and NLOS signals based on Doppler frequency and bit frequency analysis in an electromagnetic wave reverberation room, And an operation method thereof.

It is also an object of the present invention to provide a method and apparatus for measuring a radiation pattern in an entire bandwidth using a chirp of an FMCW system and measuring the radiation pattern through a single measurement, An antenna radiation pattern measurement system and an operation method thereof.

An antenna radiation pattern measurement system according to an embodiment of the present invention is a frequency modulated continuous wave (FMCW) system for measuring an antenna radiation pattern, and includes a transmitter for transmitting a transmission signal varying with time, A reception antenna for receiving a reception signal reflected in the electromagnetic wave reverberation chamber in response to the transmission signal, a Doppler (IF) signal generated from an intermediate frequency (IF) signal generated by mixing the reception signal with a linear frequency- An arithmetic unit for extracting a Doppler frequency and a beat frequency, and a measurement unit for measuring an antenna radiation pattern by separating an LOS signal (Line of Sight Signal) based on the Doppler frequency and the bit frequency.

One of the transmission antenna and the reception antenna may continuously transmit and receive a signal using the linear frequency modulation signal (LFM signal) generated by a linear frequency modulation (LFM) signal generator.

The transmission antenna may convert the linear frequency modulated signal into a using frequency band using a frequency up converter, and transmit the converted transmission signal.

The reception antenna may receive the reception signal reflected in the electromagnetic wave reverberation chamber, and may frequency convert the reception signal into a band that can process the reception signal using a frequency down converter.

The operation unit may extract the beat frequency from the intermediate frequency (IF) signal generated by mixing the received signal frequency-converted into the processable band and the linear frequency modulated signal.

The operation unit converts the intermediate frequency signal (IF signal) into a signal in a frequency domain by Fast Fourier Transform (FFT), and changes the Doppler frequency (Doppler frequency) Can be extracted.

The measuring unit may acquire a wave delay time using the bit frequency, and may convert the wave delay time into a distance to separate the LOS signal and the NLOS (None Line of Sight) signal.

The measuring unit may perform Fast Fourier Transform (FFT) in the horizontal direction on the converted wave delay time to separate the LOS signal.

The measurement unit may measure an antenna radiation pattern in a frequency region corresponding to a chirp bandwidth from the separated LOS signal through a digital signal processing block (DSP).

An antenna radiation pattern measurement system according to an embodiment of the present invention is a frequency modulated continuous wave (FMCW) system for measuring an antenna radiation pattern, wherein an up chirp and a time down chirp), a reception antenna for receiving a reception signal reflected in an electromagnetic wave reverberation chamber corresponding to the transmission signal, and a reception antenna for receiving a chirp of the received signal, And measures the antenna radiation pattern for each frequency within the bandwith.

The measuring unit may extract a Doppler frequency by arranging convolutions of the received signal in a row and applying fast Fourier transform (FFT) to each column.

The measuring unit may measure the antenna radiation pattern for each frequency in the bandwith by applying fast Fourier transform to each column.

A method for measuring an antenna radiation pattern using a Frequency Modulated Continuous Wave (FMCW) system according to an embodiment of the present invention includes transmitting a transmission signal varying with time, Receiving a reception signal reflected in an electromagnetic wave reverberation chamber in correspondence with a transmission signal, a Doppler frequency (Doppler frequency) from an intermediate frequency (IF) signal generated by mixing the reception signal with a linear frequency modulation signal, ) And a beat frequency, and measuring an antenna radiation pattern by separating a LOS signal (Line of Sight Signal) based on the Doppler frequency and the bit frequency.

There is provided a method of measuring an antenna radiation pattern using a Frequency Modulated Continuous Wave (FMCW) system according to an embodiment of the present invention. The method includes measuring an up-chirp and a down- Receiving a reception signal reflected in an electromagnetic wave reverberation chamber corresponding to the transmission signal, and arranging chirp of the received signal in a line so as to form a band And measuring an antenna radiation pattern for each frequency within a bandwidth.

According to the embodiment of the present invention, the LOS signal can be distinguished in the electromagnetic wave reverberation chamber using the FMCW system, and the antenna radiation pattern in the frequency domain corresponding to the sweep band width can be measured.

Also, according to the embodiment of the present invention, it is possible to distinguish the LOS signal and the NLOS signal based on the Doppler frequency and the bit frequency analysis in the electromagnetic wave reverberation room, out of the conventional method using only the Doppler frequency.

Also, according to the embodiment of the present invention, it is possible to shorten the measurement time by measuring the antenna radiation pattern over the entire bandwidth by one measurement using the chirp of the FMCW system.

1 is a block diagram illustrating a configuration of an antenna radiation pattern measurement system according to an embodiment of the present invention.
FIGS. 2A and 2B illustrate an electromagnetic wave reverberation chamber structure and an example of a measurement environment according to an embodiment of the present invention.
FIG. 3 illustrates an example in which Doppler frequencies in different directions are generated according to an embodiment of the present invention.
FIGS. 4A and 4B show an example of a signal shifted by another distance in the same direction, and an example of a process of separating the two signals according to an embodiment of the present invention.
FIG. 5 is a graph showing a result of a radiation pattern measured by separating an LOS signal according to an embodiment of the present invention.
6 is a block diagram illustrating a configuration of an antenna radiation pattern measurement system according to an embodiment of the present invention.
FIG. 7 illustrates an example of plotting a radiation pattern for each frequency in a bandwith according to an embodiment of the present invention.
8 is a graph showing a result of a radiation pattern measured for each frequency in a bandwith according to an embodiment of the present invention.
9 is a flowchart illustrating an antenna radiation pattern measurement method according to an embodiment of the present invention.
10 is a flowchart illustrating a method of measuring an antenna radiation pattern according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. In addition, the same reference numerals shown in the drawings denote the same members.

Also, terminologies used herein are terms used to properly represent preferred embodiments of the present invention, which may vary depending on the viewer, the intention of the operator, or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

1 is a block diagram illustrating a configuration of an antenna radiation pattern measurement system according to an embodiment of the present invention.

1, an antenna radiation pattern measurement system according to an embodiment of the present invention generates an intermediate frequency signal from a received signal reflected in an electromagnetic wave reverberation chamber, extracts a Doppler frequency and a bit frequency, And the antenna radiation pattern is measured.

Accordingly, the antenna radiation pattern measurement system 100 according to an embodiment of the present invention includes a transmission antenna 110, a reception antenna 120, an operation unit 130, and a measurement unit 140.

At this time, the antenna radiation pattern measurement system 100 according to an exemplary embodiment of the present invention may be a frequency modulated continuous wave (FMCW) system for measuring an antenna radiation pattern.

The transmit antenna 110 may emit a time-varying frequency modulation (FM) signal using a linear frequency modulation (LFM) signal generator 150 and the receive antenna 120 may receive a time- And can receive a reflected signal.

More specifically, the transmitting antenna 110 transmits a pair of FMCW waveform transmission signals composed of an up chirp and a down chirp, and the receiving antenna 120 transmits an electromagnetic wave And receives the reception signal reflected in the reverberation chamber.

For example, the transmit antenna 110 and the receive antenna 120 can transmit and receive signals continuously using a linear frequency modulated signal (LFM signal) generated by the LFM signal generator 150.

The transmission antenna 110 can convert a linear frequency modulated signal into a using frequency band using a frequency up converter (111), and transmit the converted transmission signal.

The reception antenna 120 receives a reception signal reflected in the electromagnetic wave reverberation chamber by a transmission signal output from the transmission antenna 110 and outputs the reception signal to a band capable of processing a reception signal using a down- Frequency conversion can be performed.

For example, the receiving antenna 120 receives a large number of signals reflected within the electromagnetic wave reverberation chamber. Thereafter, the frequency down converter 121 may be used to perform frequency conversion into a band capable of processing a high frequency received signal.

The operation unit 130 extracts a Doppler frequency and a beat frequency from an IF signal generated by mixing a reception signal and a linear frequency modulated signal.

For example, the operation unit 130 may receive an intermediate frequency signal generated by mixing a received signal frequency-converted into a band that can be processed by a mixer and a linear frequency-modulated signal.

The mixer mixes a reception signal received from the reception antenna 120 and a linear frequency modulation signal (LFM signal) generated by the LFM signal generator 150 to generate an intermediate frequency signal And output it.

According to the embodiment, the mixer mixes the reception signal received at the reception antenna 120 with a signal generated by the LFM signal generator 150, that is, an I signal having a 0 degree phase or a Q signal having a 90 degree phase And the I and Q reception signals can be generated as a result of the mixing.

That is, the mixer mixes the reception signal received from the reception antenna 120 and the I signal having the 0-degree phase generated by the LFM signal generator 150 to generate an I reception signal, It is possible to generate a Q reception signal by mixing a reception signal received by the reception antenna 120 and a Q signal having a phase of 90 degrees generated by the LFM signal generator 150. [

The operation unit 130 receives an intermediate frequency signal IF signal from the mixer according to the moving direction of the receiving antenna 120 using an IQ demodulator and outputs the IF signal to the baseband I / The signal can be extracted.

The IQ demodulator (IQ demodulator) can receive the IF band and finally extract the baseband I / Q signal.

1, the mixer is located between an operation unit 130 and a frequency down-converter 121 for receiving signals from the LFM signal generator 150 and the frequency down-converter 121, .

Then, the operation unit 130 may extract a beat frequency indicating a movement distance of the wave from the I / Q signal according to the intermediate frequency signal.

The bit frequency represents a frequency of a wave oscillating at a difference of two frequencies when overlapping vibrations of two frequencies whose frequencies are close to each other.

The operation unit 130 converts the intermediate frequency signal into a signal in a frequency domain by Fast Fourier Transform (FFT), and extracts a change in a Doppler frequency using a signal in the converted frequency domain .

The measurement unit 140 separates the LOS signal (Line of Sight Signal) from the Doppler frequency and the bit frequency to measure the antenna radiation pattern.

For example, the measuring unit 140 obtains a wave delay time using a bit frequency and applies Fast Fourier Transform (FFT) in the horizontal direction to the wave delay time to convert the distance , It is possible to separate the LOS signal and the NLOS (None Line of Sight) signal.

The measuring unit 140 measures an antenna radiation pattern in a frequency region corresponding to a chirp bandwidth from the LOS signal separated through a digital signal processing (DSP) .

The measuring unit 140 may measure an antenna radiation pattern by performing signal processing (e.g., FFT) on the I / Q signal extracted from the calculating unit 130. [

FIGS. 2A and 2B illustrate an electromagnetic wave reverberation chamber structure and an example of a measurement environment according to an embodiment of the present invention.

More specifically, FIG. 2A shows an example of a structure in an electromagnetic wave reverberation chamber in which a transmitting antenna and a receiving antenna are located, according to an embodiment of the present invention. FIG. The measurement environment is shown as an image.

Referring to FIGS. 2A and 2B, a transmitting antenna and a receiving antenna are disposed in an electromagnetic wave reverberation chamber, and a receiving antenna moves in a direction of LOS (Line of Sight) with a transmitting antenna.

For example, the receiving antenna may receive a signal reflected from a target or target in the electromagnetic reverberation chamber while rotating at an interval of 1 degree from 0 degrees to 180 degrees. It is also assumed that the receiving antenna in Figs. 2A and 2B is rotated at a speed of 0.2 m / s.

Also, the Z stirrer (Zstirrer) applies rotation of the receiving antenna.

FIG. 3 illustrates an example in which Doppler frequencies in different directions are generated according to an embodiment of the present invention.

More specifically, FIG. 3 shows an example of a principle in which Doppler frequencies in different directions between the LOS signal and the NLOS (None Line of Sight) signal occur according to an embodiment of the present invention.

In addition, FIG. 3 is a view for explaining the principle of measuring the Doppler frequency between the LOS signal and the NLOS signal, assuming that the receiving antenna rotates at a speed of 0.2 m / s as in FIGS. 2A and 2B.

)는 수신 안테나의 이동 속도(V)에 따라서 하기의 [수식 1]에 의해 값이 결정된다.Referring to FIG. 3, the Doppler frequency of the LOS signal (

) Is determined by the following formula 1 according to the moving speed V of the receiving antenna.

[Equation 1]

는 특성 주파수(Characteristic Frequency)를 의미하고, c는

를 나타낸다.here,

Denotes a characteristic frequency, and c denotes a characteristic frequency

.

)는 입사하는 방향에 따라서 하기의 [수식 2]에 의해 값이 결정된다.However, the Doppler frequency of the LOS signal is determined by [Equation 1], but the Doppler frequency of the NLOS signal

) Is determined by the following equation (2) according to the incident direction.

[Equation 2]

)는 LOS 신호의 도플러 주파수(

)에 비해 항상 더 작음을 알 수 있다. 그러므로, 본 발명의 일실시예에 따른 안테나 방사패턴 측정 시스템은 LOS 신호와 NLOS 신호를 구분하는 것이 가능하다. From this, the Doppler frequency of the NLOS signal (

) Is the Doppler frequency of the LOS signal (

) Is always smaller. Therefore, the antenna radiation pattern measurement system according to the embodiment of the present invention can distinguish the LOS signal and the NLOS signal.

FIGS. 4A and 4B show an example of a signal shifted by another distance in the same direction, and an example of a process of separating the two signals according to an embodiment of the present invention.

More specifically, FIG. 4A shows an example of two signals (LOS signal 1 and LOS signal 2) shifted by different distances in the same direction according to an embodiment of the present invention, and FIG. 4B shows an example of an embodiment And separating a desired signal received in the LOS direction from an undesired signal by using a beat frequency according to Equation (1).

In general, an existing method for measuring a radiation pattern generates a Doppler frequency of a reception signal received by a moving (moving) reception antenna, and generates a Doppler frequency of a reception signal based on a difference The LOS signal and the NLOS signal are separated using the Doppler frequency of the value.

However, there is a limitation that the conventional method can not distinguish between the NLOS signal and the LOS signal incident from the same direction. Even though these two signals have the same direction and the same Doppler frequency, they can be distinguished through the beat frequency because the travel distance of the wave is different. The use of bit frequencies makes detailed analysis possible.

Referring to FIG. 4A, an example in which a signal reflected by a plurality of times in the electromagnetic wave reverberation chamber is incident in the LOS direction is shown. In FIG. 4A, the radiation pattern should be measured only by the signal of the LOS signal 1. In the conventional method, the LOS signal 1 and the LOS signal 2 are not distinguished from each other, and the LOS signal 2 from the LOS direction is also measured.

In order to overcome the limitation of the conventional method, the antenna radiation pattern measurement system according to an embodiment of the present invention uses a beat frequency to distinguish the LOS signal 2.

Referring to FIG. 4B, a process of separating a desired signal (LOS signal 1 or LOS signal 2) received in the LOS direction using a beat frequency in a chirp from an undesired signal (a signal other than a desired signal) .

More specifically, the antenna radiation pattern measurement system according to an embodiment of the present invention can separate signals using Equation (3) below.

[Equation 3]

를 나타낸다. 또한, Ts는 스윕 타임(Sweep Time)을 의미하고, BW는 밴드위스(Band Width)를 의미하며,

는 비트 주파수(Beat Frequency)를 의미한다.Here, c is

. In addition, Ts denotes a sweep time, BW denotes a band width,

Means a beat frequency.

)을 알 수 있고, 상기 파동 딜레이 타임을 거리(distance)로 변환하여 두 신호(LOS 신호1 및 LOS 신호2)를 분리할 수 있다. For example, an antenna radiation pattern measurement system according to an embodiment of the present invention uses a beat frequency to calculate a wave delay time,

), And it is possible to separate the two signals (LOS signal 1 and LOS signal 2) by converting the wave delay time into a distance.

At this time, the antenna radiation pattern measurement system according to an embodiment of the present invention can calculate the result by applying Fast Fourier Transform (FFT) in the horizontal direction to the received data to obtain a separated signal .

Accordingly, the antenna radiation pattern measurement system according to an embodiment of the present invention can discriminate and separate the accurate LOS signals according to the distances using the bit frequency.

FIG. 5 is a graph showing a result of a radiation pattern measured by separating an LOS signal according to an embodiment of the present invention.

More specifically, FIG. 5 shows a result graph of a radiation pattern measured from a separated LOS signal using Doppler frequency and bit frequency through an antenna radiation pattern measurement system according to an embodiment of the present invention.

Referring to FIG. 5, a result graph of the radiation pattern measured by the Reverberation Chamber (RC) and a graph of the radiation pattern measured by the Anechoic Chamber (AC) can be confirmed.

The results of the radiation patterns measured in the electromagnetic reverberation chamber (RC) and the electromagnetic anechoic chamber (AC) are as follows. The results of the radiation patterns measured in the electromagnetic reverberation chamber (RC) It can be confirmed that the result is almost similar to the result of the radiation pattern.

Accordingly, it can be seen that the antenna radiation pattern measurement system according to an embodiment of the present invention measures the antenna radiation pattern with higher accuracy in the electromagnetic wave reverberation chamber.

6 is a block diagram illustrating a configuration of an antenna radiation pattern measurement system according to an embodiment of the present invention.

Referring to FIG. 6, an antenna radiation pattern measurement system according to an embodiment of the present invention measures the antenna radiation pattern for each frequency in the bandwis by arranging the received signals reflected in the electromagnetic wave reverberation chamber in a line.

Accordingly, the antenna radiation pattern measurement system 600 according to the embodiment of the present invention includes a transmission antenna 610, a reception antenna 620, and a measurement unit 630.

The antenna radiation pattern measurement system 600 according to the embodiment of the present invention may be a frequency modulated continuous wave (FMCW) system for measuring an antenna radiation pattern.

The transmit antenna 610 may emit a time-varying frequency modulation (FM) signal using a linear frequency modulation (LFM) signal generator 640, and the receive antenna 620 may receive And can receive a reflected signal.

More specifically, the transmission antenna 610 transmits a transmission signal of a pair of FMCW waveforms composed of an up chirp and a down chirp, and the reception antenna 620 transmits an electromagnetic wave And receives the reception signal reflected in the reverberation chamber.

For example, the transmit antenna 610 and the receive antenna 620 can continuously transmit and receive signals using a linear frequency modulated signal (LFM signal) generated by the LFM signal generator 640.

The transmission antenna 610 can convert a linear frequency modulated signal into a used frequency band using a frequency up converter 611, and transmit the converted transmission signal.

The reception antenna 620 receives a reception signal reflected in the electromagnetic wave reverberation chamber by a transmission signal output from the transmission antenna 610 and outputs the reception signal to a band capable of processing a reception signal using a down- Frequency conversion can be performed.

For example, the receiving antenna 620 receives a large number of signals reflected within the electromagnetic wave reverberation chamber. Thereafter, the frequency down converter 621 may be used to perform frequency conversion into a band capable of processing a high frequency received signal.

The measuring unit 630 arranges the chirps of the received signals in a line and measures the antenna radiation pattern for each frequency in the bandwith.

For example, the measuring unit 630 arranges the chirps of received signals in a row, extracts a Doppler frequency by applying Fast Fourier Transform (FFT) to each column, The antenna radiation pattern can be measured for each frequency in the bandwith.

Accordingly, the antenna radiation pattern measurement system 600 according to the embodiment of the present invention measures the antenna radiation pattern over a bandwith by one measurement using the received chirp of the FMCW system, Can be shortened.

According to the embodiment, the measuring unit 630 may include the configuration of the calculating unit 130 of the antenna radiation pattern measurement system 100 according to an embodiment of the present invention shown in FIG.

FIG. 7 illustrates an example of plotting a radiation pattern for each frequency in a bandwith according to an embodiment of the present invention.

More specifically, FIG. 7 plots a radiation pattern for each frequency within a band width (BW) with a single measurement through an antenna radiation pattern measurement system according to an embodiment of the present invention. .

Referring to FIG. 7, the antenna radiation pattern measurement system according to the embodiment of the present invention applies Fast Fourier Transform (FFT) to data arranged from the lowest frequency f ₀ to the corresponding band width BW And a radiation pattern can be plotted for each frequency.

8 is a graph showing a result of a radiation pattern measured for each frequency in a bandwith according to an embodiment of the present invention.

More specifically, FIG. 8 shows a result graph of a radiation pattern measured for each of three frequencies within a bandwidth (BW) by a single measurement through an antenna radiation pattern measurement system according to an embodiment of the present invention.

The three frequencies are 24.0064 GHz, 24.0227 GHz and 24.0487 GHz in the Reverberation Chamber (RC), and the target frequency is 24.6 GHz in the Anechoic Chamber (AC).

Referring to FIG. 8, a graph is obtained by measuring radiation patterns of the lowest frequency, the intermediate frequency, and the highest frequency using the data arranged from the lowest frequency to the corresponding band width (BW) shown in FIG. 7 .

Accordingly, it can be seen that the antenna radiation pattern measurement system according to the embodiment of the present invention measures the antenna radiation pattern with higher accuracy in the electromagnetic wave reverberation chamber.

9 is a flowchart illustrating an antenna radiation pattern measurement method according to an embodiment of the present invention.

The method shown in FIG. 9 can be performed by the antenna radiation pattern measurement system according to an embodiment of the present invention shown in FIG.

In step 910, a transmission signal that varies with time is transmitted.

For example, in step 910, a transmission signal of a pair of FMCW waveforms composed of an up chirp and a down chirp using a transmission antenna in a frequency modulated continuous wave (FMCW) It may be a step of sending out.

In step 920, a reception signal reflected in the electromagnetic wave reverberation chamber corresponding to the transmission signal is received.

Step 920 may be a step of receiving a received signal using a receiving antenna in a frequency modulated continuous wave (FMCW) system.

For example, the transmit antenna may emit a time-varying frequency modulation (FM) signal using a linear frequency modulation (LFM) signal generator, and the receive antenna may receive a signal reflected from the target or target can do.

In addition, the transmission antenna and the reception antenna can continuously transmit and receive signals using a linear frequency modulation signal (LFM signal) generated by the LFM signal generator.

In step 930, a Doppler frequency and a beat frequency are extracted from an IF (Intermediate Frequency) signal generated by mixing the reception signal and the linear frequency-modulated signal.

For example, step 930 may be a step of extracting a beat frequency representing a travel distance of a wave from the intermediate frequency signal.

Step 930 is a step of converting the intermediate frequency signal into a signal in a frequency domain by Fast Fourier Transform (FFT) and extracting a change in a Doppler frequency using a signal in the converted frequency domain .

In step 940, the LOS signal (Line of Sight Signal) is separated from the Doppler frequency and the bit frequency to measure the antenna radiation pattern.

For example, in step 940, a wave delay time is acquired using a bit frequency, and a Fast Fourier Transform (FFT) is applied to the wave delay time in the horizontal direction to convert the distance into LOS Signal and a None Line of Sight (NLOS) signal.

Thereafter, in step 940, an antenna radiation pattern in a frequency domain corresponding to a chirp bandwidth can be measured from the LOS signal separated through a digital signal processing (DSP) process.

10 is a flowchart illustrating a method of measuring an antenna radiation pattern according to an embodiment of the present invention.

The method shown in FIG. 10 can be performed by the antenna radiation pattern measurement system according to the embodiment of the present invention shown in FIG.

In step 1010, a transmission signal of a pair of FMCW waveforms composed of up chirp and time down chirp is transmitted.

Step 1010 may be a step of transmitting a transmission signal using a transmission antenna in a frequency modulated continuous wave (FMCW) system.

In step 1020, a reception signal reflected in the electromagnetic wave reverberation chamber is received corresponding to the transmission signal.

Step 1020 may include receiving a received signal using a receive antenna in a frequency modulated continuous wave (FMCW) system.

For example, the transmit antenna may emit a time-varying frequency modulation (FM) signal using a linear frequency modulation (LFM) signal generator, and the receive antenna may receive a signal reflected from the target or target can do.

In addition, the transmission antenna and the reception antenna can continuously transmit and receive signals using a linear frequency modulation signal (LFM signal) generated by the LFM signal generator.

In step 1030, chirps of the received signals are arranged in a line to measure the antenna radiation pattern for each frequency in the bandwith.

Step 1030 arranges the convolutions of the received signals in a row, extracts a Doppler frequency by applying Fast Fourier Transform (FFT) to each column, and calculates an antenna radiation pattern for each frequency in the bandwith Measuring step.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA) A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CDROMs and DVDs, magnetic optical media such as floppy disks, magnetooptical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100, 600: antenna radiation pattern measurement system

Claims (14)

In a frequency modulated continuous wave (FMCW) system for measuring an antenna radiation pattern,
A transmission antenna for transmitting a transmission signal varying with time;
A reception antenna for receiving a reception signal reflected in an electromagnetic wave reverberation chamber corresponding to the transmission signal;
A calculator for extracting a Doppler frequency and a beat frequency from an IF signal generated by mixing the reception signal and the linear frequency modulated signal; And
A measurement unit for separating an LOS signal (Line of Sight Signal) based on the Doppler frequency and the bit frequency and measuring an antenna radiation pattern;
The antenna radiation pattern measurement system comprising: The method according to claim 1,
Wherein one of the transmit antenna and the receive antenna
An antenna radiation pattern measurement system for continuously transmitting and receiving signals using the linear frequency modulated signal (LFM signal) generated by a linear frequency modulation (LFM) signal generator. 3. The method of claim 2,
The transmit antenna
An antenna radiation pattern measurement system for converting the linear frequency-modulated signal into a use frequency band using a frequency up-converter and transmitting the converted transmission signal. 3. The method of claim 2,
The receiving antenna
An antenna radiation pattern measurement system for receiving the received signal reflected in an electromagnetic wave reverberation chamber and frequency-converting the received signal to a processable band using a frequency down converter. 5. The method of claim 4,
The operation unit
And extracts the beat frequency from the intermediate frequency (IF) signal generated by mixing the received signal frequency-converted into the processable band and the linear frequency modulated signal. 6. The method of claim 5,
The operation unit
Converts the intermediate frequency signal (IF signal) into a signal in a frequency domain by Fast Fourier Transform (FFT), and extracts a change in the Doppler frequency using the signal in the converted frequency domain Antenna radiation pattern measurement system. 6. The method of claim 5,
The measuring unit
Acquiring a wave delay time using the bit frequency, and converting the wave delay time into a distance to separate the LOS signal and a NLOS (None Line of Sight) signal. 8. The method of claim 7,
The measuring unit
And performing Fast Fourier Transform (FFT) in the transverse direction on the converted wave delay time to separate the LOS signal. 9. The method of claim 8,
The measuring unit
An antenna radiation pattern measurement system for measuring an antenna radiation pattern in a frequency region corresponding to a chirp bandwidth from a separated LOS signal through a digital signal processing block (DSP). In a frequency modulated continuous wave (FMCW) system for measuring an antenna radiation pattern,
A transmission antenna for transmitting a transmission signal of a pair of FMCW waveforms composed of an up chirp and a down chirp;
A reception antenna for receiving a reception signal reflected in an electromagnetic wave reverberation chamber corresponding to the transmission signal; And
A measurement unit for arranging chirps of the received signals in a row and measuring an antenna radiation pattern for each frequency within a bandwidth,
The antenna radiation pattern measurement system comprising: 11. The method of claim 10,
The measuring unit
And a Doppler frequency is extracted by arranging the convolutions of the received signals in a row and applying fast Fourier transform (FFT) to each column. 12. The method of claim 11,
The measuring unit
Wherein the fast Fourier transform is applied to each column to measure the antenna radiation pattern for each frequency in the bandwith. A method of measuring an antenna radiation pattern using a Frequency Modulated Continuous Wave (FMCW) system,
Transmitting a transmission signal varying with time;
Receiving a reception signal reflected in an electromagnetic wave reverberation chamber corresponding to the transmission signal;
Extracting a Doppler frequency and a beat frequency from an IF (Intermediate Frequency) signal generated by mixing the reception signal and the linear frequency-modulated signal; And
Separating an LOS signal (Line of Sight Signal) based on the Doppler frequency and the bit frequency and measuring an antenna radiation pattern
Wherein the antenna radiation pattern measurement method comprises the steps of: A method of measuring an antenna radiation pattern using a Frequency Modulated Continuous Wave (FMCW) system,
Transmitting a transmission signal of a pair of FMCW waveforms composed of an up chirp and a down chirp;
Receiving a reception signal reflected in an electromagnetic wave reverberation chamber corresponding to the transmission signal; And
Arranging chirps of the received signals in a row to measure an antenna radiation pattern for each frequency within a bandwidth
Wherein the antenna radiation pattern measurement method comprises the steps of:

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