KR102473498B1 - Apparatus and method for target detection of PCL system with single-channel reception - Google Patents

Abstract

The present invention provides a system and method for acquiring a reference signal from a received signal through channel equalization in a PCL system for target detection and constructing a single-channel receiving PCL system using the reference signal and detecting a target. A target detection method based on a single-channel receiving PCL system according to an embodiment of the present invention includes obtaining a reference signal by performing channel equalization based on the received signal received through the single-channel by a reference signal extractor; obtaining, by a target reflection signal extractor, a target reflection signal from the received signal based on the reference signal; and detecting the target based on the reference signal and the target reflection signal by a target detector. According to the embodiment of the present invention, the complexity of the receiver operated in the PCL system, in which the target detection performance and the position estimation performance depend on the receiver position, is easily moved, and maintenance is maintained because fewer receivers are used than general PCL system receivers. It has the advantage of easy maintenance.

Description

Apparatus and method for target detection of PCL system with single-channel reception}

The present invention relates to an apparatus and method for detecting a target in a single-channel receiving PCL system, and more particularly, to a method for detecting a target through channel equalization in a PCL (passive coherent location) system for target detection. An apparatus and method for detecting a target of a single-channel receiving PCL system in which a single-channel receiving PCL system is implemented by obtaining and using the same.

A PCL system for detecting a target generally operates a reference channel for acquiring a reference signal and a surveillance channel for acquiring a target echo signal reflected from the target. The PCL system detects a target by utilizing two receivers and two antennas to receive signals of two channels.

At this time, the method of detecting the target using the reference signal and the target reflection signal by the PCL system derives the cross-ambiguity function (CAF) of the reference signal and the target reflection signal, and the maximum value of the cross-ambiguity function of the two signals. It includes a process of estimating time-difference of arrival (TDOA) and frequency-difference of arrival (FDOA) from

As such, the PCL system for target detection operates a reference channel and a monitoring channel, respectively, and obtains a reference signal and a target reflection signal through the two channels, respectively. However, in the case of operating two channels, a reference channel and a monitoring channel, there is a problem in that the complexity of system implementation increases because a separate antenna and a receiving system for operating each channel of the PCL system must be built for each channel.

The present invention facilitates mobility by reducing the number of channels operated in the PCL system, where target detection performance and position estimation performance depend on the location of the receiver, and maintenance is easy because fewer receivers are used than receivers in a general two-channel PCL system. It is to provide a target detection device and method based on an easy single-channel receiving PCL system.

A target detection method based on a single-channel reception PCL system according to an embodiment of the present invention includes: A target detection method based on a single-channel reception PCL system for detecting a target using a PCL system based on a received signal received through a single-channel. obtaining, by a reference signal extractor, a reference signal by performing channel equalization based on the received signal received through the single-channel; obtaining, by a target reflection signal extractor, a target reflection signal from the received signal based on the reference signal; and detecting the target based on the reference signal and the target reflection signal by a target detector.

The obtaining of the reference signal may include: converting the received signal into a signal in the frequency domain; estimating a channel from the signal in the frequency domain using pilot information of the received signal; acquiring a reference signal in a frequency domain by performing channel equalization using channel information estimated using the pilot information; and obtaining a reference signal in the time domain by performing inverse frequency conversion on the reference signal in the frequency domain.

Estimating the channel may include calculating a channel value of a pilot position of the pilot information based on a ratio between a pilot signal and a received signal converted into a frequency domain.

The obtaining of the reference signal in the frequency domain may include obtaining the reference signal in the frequency domain based on the channel value of the pilot position.

The received signal may be a mixed signal of the reference signal, the clutter signal, and the target reflection signal. The obtaining of the target reflection signal may include obtaining the target reflection signal by removing the reference signal and the clutter signal from the received signal.

The detecting of the target may include: obtaining a cross ambiguity function using the reference signal and the target reflection signal by a cross ambiguity function generator; and detecting, by the target detector, the target using the cross ambiguity function.

According to an embodiment of the present invention, a computer-readable recording medium on which a program for executing the target detection method based on the single-channel reception PCL system is recorded is provided.

An apparatus for detecting a target based on a single-channel receiving PCL system according to an embodiment of the present invention is configured to detect a target using a PCL system based on a received signal received through a single-channel. A detection device comprising: a reference signal extractor configured to obtain a reference signal by performing channel equalization based on the received signal received through the single-channel; a target reflection signal extractor configured to obtain a target reflection signal from the received signal based on the reference signal; and a target detector configured to detect the target based on the reference signal and the target reflection signal.

The reference signal extractor: converts the received signal into a signal in the frequency domain; estimating a channel from a signal in the frequency domain using pilot information of the received signal; obtaining a reference signal in a frequency domain by performing channel equalization using channel information estimated using the pilot information; And it may be configured to obtain a reference signal in the time domain by performing inverse frequency conversion on the reference signal in the frequency domain.

The reference signal extractor: calculates a channel value of a pilot position of the pilot information based on a ratio between a pilot signal and a received signal converted into a frequency domain; And based on the channel value of the pilot position, it may be configured to obtain a reference signal in the frequency domain.

The target reflection signal extractor may be configured to obtain the target reflection signal by removing the reference signal and the clutter signal from the received signal.

The target detection device based on a single-channel reception PCL system according to an embodiment of the present invention may further include a cross ambiguity function generator configured to obtain a cross ambiguity function using the reference signal and the target reflection signal. The target detector may be configured to detect the target using the cross ambiguity function.

According to the embodiment of the present invention, mobility is facilitated by reducing the number of channels operated in the PCL system, in which target detection performance and position estimation performance depend on the location of the receiver, and a smaller number of receivers than receivers of a general two-channel PCL system. Since it is used, it has an effect of easy maintenance.

1 is a block diagram of a target detection device based on a single-channel reception PCL system according to an embodiment of the present invention.
2 is an exemplary pilot arrangement diagram of an Advanced Television Systems Committee (ATSC) 3.0 system used for domestic ultra-high-definition (UHD) broadcasting.
3 is a flowchart of a target detection method based on a single-channel receiving PCL system according to an embodiment of the present invention.
4 is a flowchart showing step S20 of FIG. 3 in detail.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

In the present specification, when a part 'includes' a certain component, it means that it may further include other components without excluding other components unless otherwise stated. '~ group, ~ unit' used in this specification is a unit that processes at least one function or operation, and may mean, for example, software, FPGA, or hardware component. The functions provided by '~group, ~bu' may be performed separately by a plurality of components or may be integrated with other additional components. '~group, ~unit' in this specification is not necessarily limited to software or hardware, and may be configured to be in an addressable storage medium or configured to be reproduced by one or more processors. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention is based on a single-channel reception PCL system that operates only a single channel of a surveillance channel without operating a reference channel to reduce system complexity that occurs when two channels are operated in a PCL (passive coherent location) system for target detection. A target detection device and method are provided.

Since the reference signal is included in the received signal obtained from the monitoring channel, in the embodiment of the present invention, the received signal is channel-equalized to extract and use the reference signal, so that the single-channel receiving PCL system does not operate a separate reference channel. Based on this, target detection is possible.

According to an embodiment of the present invention, a target reflection signal can be obtained by removing a direct path signal and a clutter signal from a signal received in a monitoring channel using a reference signal extracted from a received signal received through a single channel. have.

In the case of the PCL system, since the detection performance of the target reflection signal depends on the arrangement of the receiver, it is necessary to manufacture for easy mobility. It can be implemented to be lightweight and easy to move.

According to an embodiment of the present invention, a reference signal can be obtained by performing channel equalization with estimated channel information using a commercial signal such as digital broadcasting or Wi-Fi as a signal source. When using a digital signal, channel estimation is possible through pilot information.

1 is a block diagram of a target detection device based on a single-channel reception PCL system according to an embodiment of the present invention. An apparatus for detecting a target based on a single-channel reception PCL system according to an embodiment of the present invention may detect a target using a PCL system based on a received signal received through a single-channel.

Referring to FIG. 1, an apparatus for detecting a target based on a single-channel receiving PCL system according to an embodiment of the present invention includes a single-channel receiver 10, a received signal storage unit 20, a reference signal extractor 30, and a target reflection signal extractor. (40), a cross ambiguity generator (50), and a target detector (60).

The single-channel receiver 10 may receive a reception signal in which a reference signal, a clutter signal, and a target reflection signal are mixed through a single-channel including only a monitoring channel and not a reference channel. The received signal storage unit 20 may store the received signal received through the single-channel by the single-channel receiver 10 .

The received signal stored in the received signal storage unit 20 may be transferred to the reference signal extractor 30 for extraction of the reference signal. Also, the received signal stored in the received signal storage unit 20 may be transferred to the target ambiguity function generator 40 to generate a target ambiguity function from the received signal using a reference signal.

The reference signal extractor 30 receives the received signal received through the single-channel by the single-channel receiver 10 and stored in the received signal storage unit 20 from the received signal storage unit 20, and transmits the transferred received signal. Based on the channel equalization, a reference signal for target detection may be obtained.

2 is an exemplary pilot arrangement diagram of an Advanced Television Systems Committee (ATSC) 3.0 system used for domestic UHD broadcasting. 1 and 2, the reference signal extractor 30 may include a channel estimator 32 for estimating a channel using pilot information and a channel equalizer 34 for performing channel equalization through channel estimation. can

The channel estimator 32 converts the received signal stored in the received signal storage unit 20 into a signal in the frequency domain by a frequency converter (not shown) to obtain a reference signal, and uses pilot information of the received signal to obtain a frequency domain. A channel of a received signal can be estimated from signals in the area.

The channel equalizer 34 obtains a reference signal in the frequency domain by performing channel equalization by applying a channel equalization algorithm using the channel information estimated using the pilot information by the channel estimator 32, and obtains a reference signal in the frequency domain. A reference signal in the time domain may be obtained by performing inverse frequency conversion of the signal by an inverse converter (not shown).

At this time, the reference signal extractor 30 calculates the channel value of the pilot position of the pilot information based on the ratio between the received signal converted to the frequency domain and the pilot signal, and based on the channel value of the pilot position, the reference signal in the frequency domain. signal can be obtained. This will be described later with reference to Equations 2 and 3 below.

The target reflection signal extractor 40 removes the reference signal and the clutter signal included in the received signal from the received signal stored in the received signal storage unit 20 based on the reference signal obtained by the reference signal extractor 30. , it is possible to obtain a target reflection signal for target detection without using a separate reference channel.

The cross ambiguity function generator 50 uses the reference signal obtained from the received signal by the reference signal extractor 30 and the target reflection signal obtained by the target reflection signal extractor 40 based on the reference signal and the received signal. A cross-ambiguity function can be obtained.

The target detector 60 may detect the target in real time by using the cross ambiguity function obtained by the cross ambiguity function generator 50 based on the reference signal and the target reflection signal.

In the case of a conventional PCL receiver, a reference signal and a target reflection signal are obtained from two channels, respectively, a reference channel and a monitoring channel to detect a target. However, in a PCL system where mobility is important, it is necessary to reduce the weight of the receiver.

In the case of digital broadcasting and Wi-Fi systems, channel estimation is possible through pilot signals, and if channel equalization is performed using the estimated channel information, the signal received through the monitoring channel without operating a separate reference channel A reference signal of the PCL system can be obtained.

If the target is detected by operating the PCL system as a single channel, the complexity of the PCL system is reduced because there is no need to operate the reference channel, and the mobility of the target detection device based on the PCL system can be improved.

That is, the complexity of the receiver operated in the PCL system, where target detection performance and position estimation performance depend on the receiver position, is easy to move, and maintenance is easy because fewer receivers are used than general PCL system receivers. have.

3 is a flowchart of a target detection method based on a single-channel receiving PCL system according to an embodiment of the present invention. The target detection method based on a single-channel reception PCL system according to an embodiment of the present invention may detect a target using a PCL system based on a received signal received through a single-channel.

Referring to FIGS. 1 and 3 , the single-channel receiver 10 may receive a received signal in which a reference signal, a clutter signal, and a target reflection signal are mixed through a single channel. When the received signal is received by the single-channel receiver 10, the received signal storage unit 20 may store the received signal received through the single-channel by the single-channel receiver 10 (S10).

The reference signal extractor 30 performs channel equalization based on the received signal received through the single-channel by the single-channel receiver 10 and stored in the received signal storage 20, and detects the target without using the reference channel. A reference signal for may be obtained (S20).

4 is a flowchart showing step S20 of FIG. 3 in detail. 1 to 4, the channel estimator 32 converts the received signal stored in the received signal storage unit 20 into a signal in the frequency domain to obtain a reference signal (eg, fast Fourier transform (FFT); Fast Fourier Transform)) can be performed (S22).

The channel estimator 32 may estimate the channel of the received signal from the received signal converted to the frequency domain using the pilot information of the received signal as shown in FIG. 2 (S24). Since a method of estimating a signal channel using pilot information is known, a detailed description thereof will be omitted so as not to obscure the subject matter of the present invention.

The channel equalizer 34 may obtain a reference signal in the frequency domain by performing channel equalization by applying a channel equalization algorithm using channel information estimated using pilot information by the channel estimator 32 (S26). .

The channel equalizer 34 may obtain a reference signal in the time domain by performing inverse frequency transform (eg, Inverse Fast Fourier Transform (IFFT)) on the reference signal in the frequency domain.

At this time, the reference signal extractor 30 calculates the channel value of the pilot position of the pilot information based on the ratio between the received signal converted to the frequency domain and the pilot signal, and based on the channel value of the pilot position, the reference signal in the frequency domain. signal can be obtained. A more detailed description of this will be described later with reference to Equations 2 and 3.

The target reflection signal extractor 40 removes the reference signal and the clutter signal included in the received signal from the received signal stored in the received signal storage unit 20 based on the reference signal obtained by the reference signal extractor 30 to target the target signal. A target reflection signal for detection may be acquired (S30).

The cross ambiguity function generator 50 is a reference signal obtained through channel equalization of the received signal by the reference signal extractor 30 and the target reflection obtained by using the received signal and the reference signal by the target reflection signal extractor 40. A cross ambiguity function can be obtained using a signal.

The target detector 60 may detect the target in real time by using the cross ambiguity function obtained by the cross ambiguity function generator 50 based on the reference signal and the target reflection signal. Hereinafter, embodiments of the present invention will be described in more detail. The received signal can be expressed as Equation 1.

[Equation 1]

은 수신 신호,

은 단일 채널 수신기(10)로 들어오는 기준 신호의 세기,

는 단일 채널 수신기(10)로 들어오는 클러터 신호의 개수,

는 단일 채널 수신기(10)로 들어오는

번째 클러터 신호의 세기,

는 단일 채널 수신기(10)로 들어오는 표적 반사 신호의 세기,

는 표적 반사 신호의 도플러 주파수,

은 단일 채널 수신기(10)에서의 잡음을 의미한다.here,

is the received signal,

is the strength of the reference signal coming into the single channel receiver 10,

Is the number of clutter signals coming into the single channel receiver 10,

is incoming to the single channel receiver 10

The strength of the th clutter signal,

Is the intensity of the target reflection signal coming into the single channel receiver 10,

is the Doppler frequency of the target reflection signal,

Means the noise in the single channel receiver 10.

The received signal received by the single channel receiver 10 is the same as the signal received through the monitoring channel of the existing PCL system, and can be used as an input signal of the cross ambiguity function. After that, in order to acquire the reference signal, channel estimation may be performed using the signal received by the single channel receiver 10 .

Channel estimation can be performed by using a digital broadcasting signal, Wi-Fi, and long term evolution (LTE) mobile communication signal using channel estimation as a pilot signal as a signal source. As an example, FIG. 2 is an example of a pilot arrangement of an ATSC 3.0 system, which is an American broadcasting standard used for domestic UHD broadcasting.

을 고속 푸리에 변환(FFT; fast Fourier transform)하여 주파수 대역의 신호

를 얻을 수 있다. 파일럿 위치의 채널 값

는 아래의 수학식 2로 나타낼 수 있다.In FIG. 2, the colored portion is a pilot signal, and a predetermined signal is inserted in the transmission process so that the single channel receiver 10 can estimate the channel. For channel estimation, the reference signal extractor 30 uses the received signal

A signal in the frequency band by fast Fourier transform (FFT)

can be obtained. Channel value at pilot position

Can be represented by Equation 2 below.

[Equation 2]

는 파일럿 신호이며,

개의 심볼 개수를 사용한 경우

은 OFDM(orthogonal frequency division multiplexing) 심볼 인덱스를 나타내며,

개의 부반송파 수를 사용한 경우

는 OFDM 주파수 인덱스를 나타낸다.here

is the pilot signal,

When using the number of symbols

Represents an orthogonal frequency division multiplexing (OFDM) symbol index,

When using the number of subcarriers

represents an OFDM frequency index.

After estimating channel information at pilot positions, channel estimation values can be obtained at all indices by using interpolation to obtain channel information at non-pilot positions. This channel estimation value may be used in a subsequent channel equalization process.

는 아래의 수학식 3과 같이 나타낼 수 있다.Channel equalization is a signal processing technique for removing or reducing clutter information and channel distortion interference caused by multi-path. Since a transmission signal can be restored through channel equalization, a reference signal of a reference channel can be obtained using the restored signal in the PCL system. Frequency domain signal of reference signal estimated through channel equalization

Can be expressed as in Equation 3 below.

[Equation 3]

신호를 역주파수 변환(IFFT; Inverse FFT) 처리하여 시간 영역의 신호로 변경함으로써, 시간 영역의 기준 신호

을 획득할 수 있다. 획득한 기준 신호를 이용하여 표적 반사 신호를 획득하기 위하여 수학식 1에 존재하는 기준 신호 및 클러터 신호를 제거하여야 한다. PCL 시스템에서 표적 반사 신호 획득에 사용되는 알고리즘으로는 ECA(extensive cancellation algorithm)가 있으며, 아래의 수학식 4로 나타낼 수 있다.obtained after

By converting the signal into a time domain signal by inverse FFT (IFFT) processing, the reference signal in the time domain

can be obtained. In order to obtain a target reflection signal using the acquired reference signal, the reference signal and clutter signal present in Equation 1 must be removed. An algorithm used to obtain a target reflection signal in the PCL system includes an extensive cancellation algorithm (ECA), which can be expressed by Equation 4 below.

[Equation 4]

은 다중 경로 신호를 제거하기 위해 설정하는 상수이며,

은

번째 경로의 기준 신호를 제거하기 위한 필터 상수이다. 여기서

는 기준 신호와 표적 반사 신호를 이용하여 아래의 수학식 5로 나타낼 수 있다.here

is a constant set to remove the multipath signal,

silver

It is a filter constant for removing the reference signal of the th path. here

Can be expressed by Equation 5 below using a reference signal and a target reflection signal.

[Equation 5]

는

개의 수집 샘플 개수의 수신 신호

벡터를 나타내며,

은 기준 신호

를 열로 가지며, 0부터

까지 지연된 기준 신호의

행렬을 나타낸 것이다. 이를 이용하여 수학식 4의 결과로 표적 반사 신호를 획득할 수 있다.here

Is

Received signal of the number of collected samples

represents a vector,

silver reference signal

as a column, from 0

of the reference signal delayed up to

represents a row. Using this, a target reflection signal can be obtained as a result of Equation 4.

과 표적 반사 신호

을 아래의 수학식 6에 대입하여 최종적으로 단일-채널 수신 PCL 시스템의 교차 모호함수를 산출할 수 있으며, 교차 모호함수를 기반으로 표적 검출기(60)를 적용하여 최종적으로 표적을 추출할 수 있다.The reference signal obtained in this way

and target reflection signal

The cross ambiguity function of the single-channel reception PCL system can be finally calculated by substituting E into Equation 6 below, and the target can be finally extracted by applying the target detector 60 based on the cross ambiguity function.

[Equation 6]

는 교차 모호함수,

는 기준 신호,

는 표적 반사 신호, n은 시간인덱스,

는 도달지연시간(TDOA; time-difference of arrival),

는 도달주파수차(FDOA; frequency-difference of arrival), N 은 수집 샘플 개수이다.In Equation 6,

is the cross ambiguity,

is the reference signal,

is the target reflection signal, n is the time index,

is the time-difference of arrival (TDOA),

is the frequency-difference of arrival (FDOA), and N is the number of collected samples.

에 표적 검출기(60)를 적용하여 표적을 검출할 수 있다. 또한, 연속적인 탐지 결과를 기반으로 표적의 위치를 추정 및 추적하여 PCL 수신기의 실시간 표적 탐지 목적을 달성할 수 있다.When the cross ambiguity function is calculated, the square of the magnitude of the cross ambiguity function

The target detector 60 may be applied to detect the target. In addition, the purpose of real-time target detection of the PCL receiver can be achieved by estimating and tracking the position of the target based on continuous detection results.

According to the target detection method based on a single-channel receiving PCL system according to an embodiment of the present invention as described above, there is no need to detect a target by acquiring a reference signal and a target reflection signal from two channels, respectively, a reference channel and a monitoring channel. It is possible to detect a target by operating the PCL system with a single channel, and since there is no need to operate a reference channel, not only the complexity of the PCL system is reduced, but also the mobility of the target detection device based on the PCL system can be improved.

Therefore, according to the embodiment of the present invention, the complexity of the receiver operated in the PCL system is reduced to facilitate portability, and maintenance is easy because fewer receivers are used than general PCL system receivers.

A target detection method based on a single-channel receiving PCL system according to an embodiment of the present invention enables channel estimation through a pilot signal in the case of digital broadcasting and Wi-Fi systems, and performs channel equalization using the estimated channel information. It is possible to obtain the reference signal of the PCL system from the signal received through the monitoring channel.

A target detection method based on a single-channel receiving PCL system according to an embodiment of the present invention detects targets such as ships, airplanes, drones, etc., and uses portable wireless terminals equipped with wireless communication systems such as LTE or Wi-Fi systems. It can be used to detect the same target, but the target to be detected is not limited thereto.

The embodiments described above may be implemented as hardware components, software components, and/or a combination of hardware components and software components. For example, the devices, methods and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate (FPGA) array), programmable logic units (PLUs), microprocessors, or any other device capable of executing and responding to instructions.

A processing device may run an operating system and one or more software applications running on the operating system. A processing device may also access, store, manipulate, process, and generate data in response to execution of software. For convenience of understanding, there are cases in which one processing device is used, but those skilled in the art know that a processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It will be understood that it can include

For example, a processing device may include a plurality of processors or a processor and a controller. Also, other processing configurations are possible, such as a parallel processor. Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. You can command the device.

Software and/or data may be any tangible machine, component, physical device, virtual equipment, computer storage medium or device, intended to be interpreted by or provide instructions or data to a processing device. , or may be permanently or temporarily embodied in a transmitted signal wave. Software may be distributed on networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer readable media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. Computer readable media may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CDROMs and DVDs, and ROMs, RAMs, and flash memories. hardware devices specially configured to store and execute program instructions, such as; Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. 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.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved. Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

10: single channel receiver
20: reception signal storage unit
30: reference signal extractor
32: channel estimator
34: channel equalizer
40: target reflection signal extractor
50: cross ambiguity generator
60: target detector

Claims (12)

A target detection method based on a single-channel receiving PCL system for detecting a target using the PCL system based on a received signal received through a single-channel, comprising:
obtaining, by a reference signal extractor, a reference signal by performing channel equalization based on the received signal received through the single-channel;
obtaining, by a target reflection signal extractor, a target reflection signal from the received signal based on the reference signal; and
detecting the target based on the reference signal and the target reflection signal by a target detector;
The step of obtaining the reference signal is:
converting the received signal into a signal in the frequency domain;
estimating a channel from the signal in the frequency domain using pilot information of the received signal;
acquiring a reference signal in a frequency domain by performing channel equalization using channel information estimated using the pilot information; and
Inverse frequency-converting the reference signal in the frequency domain to obtain a reference signal in the time domain;
The single-channel is a channel for receiving, through a single receiver, a signal including the reference signal and the target reflection signal in a frequency band of a signal used in the PCL system, target detection method based on a single-channel receiving PCL system. delete According to claim 1,
The step of estimating the channel comprises calculating a channel value of a pilot position of the pilot information based on a ratio between a received signal converted to a frequency domain and a pilot signal, a target detection method based on a single-channel received PCL system. . According to claim 3,
Wherein the step of acquiring a reference signal in the frequency domain comprises acquiring a reference signal in the frequency domain based on the channel value of the pilot position. A target detection method based on a single-channel receiving PCL system for detecting a target using the PCL system based on a received signal received through a single-channel, comprising:
obtaining, by a reference signal extractor, a reference signal by performing channel equalization based on the received signal received through the single-channel;
obtaining, by a target reflection signal extractor, a target reflection signal from the received signal based on the reference signal; and
detecting the target based on the reference signal and the target reflection signal by a target detector;
The received signal is a mixed signal of the reference signal, the clutter signal, and the target reflection signal,
The obtaining of the target reflection signal includes obtaining the target reflection signal by removing the reference signal and the clutter signal from the received signal;
The single-channel is a channel for receiving, through a single receiver, a signal including the reference signal and the target reflection signal in a frequency band of a signal used in the PCL system, target detection method based on a single-channel receiving PCL system. A target detection method based on a single-channel receiving PCL system for detecting a target using the PCL system based on a received signal received through a single-channel, comprising:
obtaining, by a reference signal extractor, a reference signal by performing channel equalization based on the received signal received through the single-channel;
obtaining, by a target reflection signal extractor, a target reflection signal from the received signal based on the reference signal; and
detecting the target based on the reference signal and the target reflection signal by a target detector;
Detecting the target comprises:
obtaining a cross ambiguity function using the reference signal and the target reflection signal by a cross ambiguity function generator; and
Detecting, by the target detector, the target using the cross ambiguity function;
The single-channel is a channel for receiving, through a single receiver, a signal including the reference signal and the target reflection signal in a frequency band of a signal used in the PCL system, target detection method based on a single-channel receiving PCL system. A computer-readable recording medium in which a program for executing the target detection method based on a single-channel reception PCL system according to any one of claims 1, 3 to 6 is recorded. A target detection device based on a single-channel receiving PCL system configured to detect a target using the PCL system based on a received signal received through a single-channel, comprising:
a reference signal extractor configured to obtain a reference signal by performing channel equalization based on the received signal received through the single-channel;
a target reflection signal extractor configured to obtain a target reflection signal from the received signal based on the reference signal; and
A target detector configured to detect the target based on the reference signal and the target reflection signal;
The reference signal extractor:
converting the received signal into a signal in the frequency domain;
estimating a channel from a signal in the frequency domain using pilot information of the received signal;
obtaining a reference signal in a frequency domain by performing channel equalization using channel information estimated using the pilot information; and
Inverse frequency-convert the reference signal in the frequency domain to obtain a reference signal in the time domain;
The single-channel is a channel for receiving a signal including the reference signal and the target reflection signal in a frequency band of a signal used in the PCL system through a single receiver, single-channel receiving PCL system based target detection device. delete According to claim 8,
The reference signal extractor:
calculating a channel value of a pilot position of the pilot information based on a ratio between a pilot signal and a received signal converted into a frequency domain; and
and acquires a reference signal in the frequency domain based on the channel value of the pilot position. A target detection device based on a single-channel receiving PCL system configured to detect a target using the PCL system based on a received signal received through a single-channel, comprising:
a reference signal extractor configured to obtain a reference signal by performing channel equalization based on the received signal received through the single-channel;
a target reflection signal extractor configured to obtain a target reflection signal from the received signal based on the reference signal; and
A target detector configured to detect the target based on the reference signal and the target reflection signal;
The received signal is a mixed signal of the reference signal, the clutter signal, and the target reflection signal,
the target reflection signal extractor is configured to obtain the target reflection signal by removing the reference signal and the clutter signal from the received signal;
The single-channel is a channel for receiving a signal including the reference signal and the target reflection signal in a frequency band of a signal used in the PCL system through a single receiver, single-channel receiving PCL system based target detection device. A target detection device based on a single-channel receiving PCL system configured to detect a target using the PCL system based on a received signal received through a single-channel, comprising:
a reference signal extractor configured to obtain a reference signal by performing channel equalization based on the received signal received through the single-channel;
a target reflection signal extractor configured to obtain a target reflection signal from the received signal based on the reference signal;
a target detector configured to detect the target based on the reference signal and the target reflection signal; and
A cross ambiguity function generator configured to obtain a cross ambiguity function using the reference signal and the target reflection signal;
the target detector is configured to detect the target using the cross ambiguity function;
The single-channel is a channel for receiving a signal including the reference signal and the target reflection signal in a frequency band of a signal used in the PCL system through a single receiver, single-channel receiving PCL system based target detection device.

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