KR20230029432A - Method of selecting transmission source for detection of target location and transmission source selection device performing method - Google Patents

Abstract

According to an embodiment of the present invention, a transmission source selecting method for detecting a plurality of targets performed by a system for receiving an RF signal including an antenna, comprises the steps of: obtaining, by an antenna, a reference signal directly received from a plurality of transmission sources and a reflected signal received after being transmitted from the transmission sources and reflected to a plurality of targets; selecting one or more first transmission sources in which a first azimuth, which is an estimated azimuth of each of the transmission sources and a second azimuth, which is an actual azimuth of each of the transmission sources is within a predetermined range, from the transmission sources, on the basis of the received reference signal and reflected signal; and selecting one or more third transmission sources as a candidate transmission source for detecting the targets, from the first transmission sources, on the basis of an interference signal of a second transmission source different from any one of the first transmission sources with respect to a reference signal of the first transmission sources. Therefore, a target can be accurately detected.

Description

Source selection method for target detection and transmission source selection device performing the method

The present invention relates to a method for selecting an optimal transmitter for target detection using a transmitter signal and a signal reflected on a target, and a transmitter selection device for performing the method.

A multistatic PCL (passive coherent location) system is a reference signal that directly receives signals emitted from a plurality of third-party transmission sources such as FM radio broadcasting, terrestrial digital multimedia broadcasting (DMB) broadcasting, and digital TV broadcasting, and reflects them from a moving target. Obtain bistatic distance and bistatic speed information by estimating the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) of the received target reflection signal, and link it with a specific target It is a system for detecting the position of a target.

In order for the multistatic PCL system to effectively detect a target, a transmitter with excellent quality of signals reaching the multistatic PCL system must be selected. As the signal strength increases, the detection range of the multistatic PCL system expands. Therefore, the conventional multistatic PCL system selects transmitters in the order of highest received signal strength, excluding transmitters using the same frequency and selecting multiple transmitters for the same transmitter. Since it is disadvantageous in terms of geometric arrangement, it is possible to select a transmitter in a manner in which multiple transmitters are not selected in the same transmitter.

In an actual operating environment, interference on the line of sight (LOS) of a signal according to the position of a third transmitting source and the multi-static PCL system, interference by surrounding clutter, interference by other transmitting sources using the same frequency, and multi-static There is a problem that various environmental factors exist, such as reference signal interference from a high-power transmission source located in a short distance from the PCL system and effective bandwidth change according to the real-time sound source change of the transmission source.

Therefore, there is a need for a method for efficiently selecting an optimal transmission source by analyzing signal quality more accurately and precisely in various aspects.

An object of the present invention is to provide a method and apparatus for classifying the quality of a transmitter signal for target detection and selecting an optimal transmitter through step-by-step analysis.

However, the problem to be solved by the present invention is not limited to those mentioned above, and another problem to be solved that is not mentioned can be clearly understood by those skilled in the art from the description below. will be.

According to an embodiment of the present invention, a method for selecting a transmitter for detecting a plurality of targets performed by a system for receiving an RF signal including an antenna includes reference signals directly received from a plurality of transmitters and the plurality of transmitters. obtaining a reflected signal transmitted from the target and reflected on the plurality of targets; Based on the received reference signal and the reflected signal, among the plurality of transmitting sources, an orientation difference between a first bearing, which is an estimated bearing of each of the plurality of transmitting sources, and a second bearing, which is an actual bearing of each of the plurality of transmitting sources, is determined by a predetermined value. selecting at least one first transmitting source within a range; Detects the plurality of targets by detecting a third transmission source among the at least one first transmission source based on an interference signal for the reference signal of the first transmission source transmitted by a second transmission source different from any one of the first transmission sources It may include selecting as a candidate transmitter for the.

The first orientation is an orientation obtained by estimating the orientation of the transmission source using the received reference signal and the reflected signal using a reception orientation calculation algorithm, and the second orientation is the orientation of the plurality of transmission sources and the system for receiving the RF signal. It may be a bearing obtained by geometrically calculating an actual bearing of the target using a determined positional relationship. The second transmission source is located in an area other than the first bearing of the first transmission source, the strength of the reference signal of the second transmission source is greater than or equal to a predetermined signal strength, and the frequency of the reference signal of the second transmission source is 1 may be the same as the sender.

measuring a time difference of arrival (TDOA) or frequency difference of arrival (FDOA) according to time for each of the plurality of transmitting sources, based on the received reference signal and the reflected signal; determining whether signal quality continuity is satisfied based on TDOA or FDOA of the plurality of transmission sources; The method may further include selecting a candidate transmitter for detecting the plurality of targets in consideration of whether or not the signal quality persistence is satisfied.

analyzing signal strengths to determine whether strengths of reference signals transmitted from the plurality of transmitters are greater than or equal to a predetermined value; The method may further include selecting a candidate transmitting source for detecting the plurality of targets by further considering the signal strength.

determining whether the selected number of candidate transmission sources for target detection is greater than or equal to a predetermined number; if the number of candidate transmitters for target detection is greater than or equal to a predetermined number, prioritizing the candidate transmitters; and maintaining the candidate transmitters up to a predetermined number in order of highest priority.

determining whether the selected number of candidate transmission sources for target detection is greater than or equal to a predetermined number; if the number of candidate transmitters for target detection is less than a predetermined number, determining a priority among at least one fourth transmitter different from the candidate transmitter selected from among the plurality of transmitters; and adding as candidate transmitters for target detection by a difference between the number of candidate transmitters for target detection from the predetermined number in order of highest priority among the fourth transmitters.

The priority is determined by assigning a positive first weight to the third transmission source in which a difference in orientation between the first and second orientations is within a predetermined range, and satisfying the signal quality persistence. A predetermined second weight value, which is a positive value, is assigned to a transmitter, and a predetermined third weight value, which is a positive value, is assigned to a transmitter whose signal strength of the plurality of transmitters is equal to or greater than a predetermined value, and the first to second weight values are assigned to each transmitter. The sum of the third weights may be a rank in which the transmitters are arranged in an order of high.

When the purpose of detecting the target is changed after the point at which the transmitter for detecting the location of the target is selected, the antenna transmits the reference signal directly received from the plurality of transmitters and the plurality of transmitters, obtaining a received reflected signal after being reflected on a target of the; Based on the received reference signal and the reflected signal, among the plurality of transmitting sources, an orientation difference between a first bearing, which is an estimated bearing of each of the plurality of transmitting sources, and a second bearing, which is an actual bearing of each of the plurality of transmitting sources, is determined by a predetermined value. selecting at least one first transmitting source within a range; Among the at least one first transmission source, at least one third transmission source is selected as the plurality of targets based on an interference signal of a second transmission source different from any one of the first transmission sources and the reference signal of the first transmission source. The step of selecting a candidate transmitter for detection may be performed again.

The purpose may include a case where the location of the plurality of targets is changed or a location of a specific target among the plurality of targets is detected.

In a method for selecting a transmitter for detecting a plurality of targets in a system for receiving an RF signal including an antenna according to another embodiment of the present invention, the antenna is configured to transmit reference signals transmitted from a plurality of transmitters and from the plurality of transmitters. receiving a reflected signal transmitted and reflected on the target; measuring a time difference of arrival (TDOA) or frequency difference of arrival (FDOA) according to time for each of the plurality of transmitting sources, based on the received reference signal and the reflected signal; determining whether signal quality continuity is satisfied based on TDOA or FDOA of the plurality of transmitters; The method may include selecting at least one transmitting source that satisfies the signal quality persistence as a candidate transmitting source for detecting the plurality of targets.

Determining whether the signal quality continuity is satisfied may include determining whether TDOA or FDOA of the plurality of transmitting sources is periodically measured; prioritizing the plurality of transmitters in an order in which the number of measured TDOAs or FDOAs of the plurality of transmitters is greater; The method may include arranging the transmitters in the order of highest priority among the plurality of transmitters and determining that signal quality continuity is satisfied by a predetermined number of transmitters in ascending order.

An apparatus for selecting a transmitter according to another embodiment of the present invention includes an antenna for obtaining a reference signal directly received from a plurality of transmitters and a reflected signal transmitted from the plurality of transmitters and reflected by the plurality of targets; Based on the received reference signal and the reflected signal, among the plurality of transmitting sources, an orientation difference between a first bearing, which is an estimated bearing of each of the plurality of transmitting sources, and a second bearing, which is an actual bearing of each of the plurality of transmitting sources, is determined by a predetermined value. At least one first transmission source within a range is selected, and among the at least one first transmission source, a second transmission source different from any one of the first transmission sources is based on an interference signal with respect to the reference signal of the first transmission source. , a processor for selecting at least one third transmitting source as a candidate transmitting source for detecting the plurality of targets.

According to an embodiment of the present invention, a transmitter for target detection is selected based on the signal integrity of the transmitter, the signal strength of the transmitter, and the persistence of signal quality of the transmitter, so that the transmitter whose signal is continuously detected is selected and the target is detected. can be accurately detected.

1 conceptually illustrates a PCL system and a surrounding environment according to an embodiment of the present invention.
2 is a block diagram conceptually illustrating the functions of a PCL system.
3 is a block diagram conceptually illustrating functions of a target position predictor according to an embodiment of the present invention.
4 is a graph for confirming the continuity of signal quality according to another embodiment of the present invention.
FIG. 5 is a block diagram illustrating an apparatus for selecting a transmitter for a PCL system according to an embodiment of the present invention in terms of hardware.
6 (a) and (b) are flowcharts illustrating a method for selecting a transmitter in a PCL system according to an embodiment of the present invention.

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.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the embodiment of the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

1 conceptually illustrates a multistatic PCL system according to an embodiment of the present invention.

Referring to FIG. 1, a system for receiving an RF signal for detecting a target may be a multi-static PCL system 1000. The multistatic PCL system 1000 includes a reference signal radiated from M transmission sources 200-1, ... , 200-M and directly received by the multistatic PCL system 1000, and M transmission sources 200-1, . .. ,200-M) is reflected on the moving target 100, and K targets 100-1, ... ,100- K) can detect the location.

2 is a block diagram conceptually illustrating functions of a multistatic PCL system according to an embodiment of the present invention. The multi-static PCL system 1000 may include a target location prediction unit 1100, a signal integrity analysis unit 1400, a signal strength analysis unit 1500, a signal quality continuity analysis unit 1600, and a transmission source selection unit 1700. The target position predictor 1100 may include a signal receiver 1100, a signal processor 1130, and a position detector 1150.

3 is a block diagram conceptually illustrating functions of a target position predictor according to an embodiment of the present invention.

1, 2 and 3, according to an embodiment of the present invention, the target position predictor 1100 may include a signal receiver 1100, a signal processor 1130, and a location detector 1150. can The target position predictor 1100 receives signals from transmitters 200-1, ..., 200-M and targets 100-1, ..., 100-K, and receives signals from the target based on the received signals. position can be predicted.

The signal receiver 1110 may include an array antenna 1112 and a signal measurer 1114. The array antenna 1112 includes N antennas, signals transmitted from M transmitting sources 200-1, ... , 200-M and K targets 100-1, ... , 100-K The signal reflected from the can be received. For example, the array antenna 1112 is installed at regular intervals to receive radio frequency (RF) signals transmitted from the M transmission sources 200-1, ..., 200-M. can include

The signal measurer 1110 may include M signal measurers 1114-1, ..., 1114-M for measuring signals received from the array antennas 1112 by distributing them for each channel.

First, the signal measurer 1114 receives N RF signals received from the array antenna. Subsequently, the signal measurer 1114 performs band-pass filtering in order to remove signal components other than the prescribed frequency band from the wireless broadcast service received from the M transmission sources 200-1, ..., 200-M, and , can be amplified with a low-noise amplifier.

Thereafter, the signal measurer 1114 performs a series of processes such as frequency conversion and analog-digital converter (ADC) calculation to generate N I/Q signals for each transmitting source 200-1, ... , 200-M. can create

The signal processor 1130 may include M signal processors 1130-1, ??, and 1130-M, and the signal processor 1130 may distribute and process electronic information collected from the signal measurer 1114. there is.

The M signal processors 1130-1, ... , 1130-M receive I/Q signals from each of the M signal measurers 1114-1, ... , 1114-M, and receive digital beamforming-based Separation of reference signal and target reflection signal, removal of clutter signal and reference signal interference, coherent signal processing for target detection, and bistatic distance and bistatic speed from the detected target It is possible to perform a plurality of signal processing processes, such as measuring target information including.

The location detection unit 1150 may include a same target information matcher 1152 and a position/velocity predictor 1154.

Subsequently, the identical target information matcher 1152 of the location detection unit 1150 receives the target information detected from the signal processing unit 1130 and matches the received target information to each identical target. Thereafter, the position/velocity predictor 1154 may detect the position of the target by receiving target information matched for each same target.

The signal integrity analyzer 1400 may analyze the integrity of the received signal in two steps: determining whether a difference between the estimated bearing and the actual bearing of the transmitting source is within an error range and determining whether an interference signal exists.

In more detail, the signal integrity analyzer 1400 analyzes signal distortion for each channel to determine whether the difference between the estimated azimuth and the actual azimuth of the M transmitting sources 200-1, ..., 200-M is within an error range. do. The signal integrity analyzer 1400 receives the I/Q data for each channel measured by the signal receiver 1110 and estimates the received direction of the signal for M channels.

At this time, the signal integrity analyzer 1400 may estimate the reception direction of the signal using a reception direction calculation algorithm such as multiple signal classification (MUSIC) or estimation of signal parameters via rotational invariance technique (ESPRIT).

과 송신원과 PCL 시스템(1000)의 위치를 기반으로 기하학적으로 계산된 표적의 실제 방위값

를 비교하여 후보 송신원을 선정한다. Subsequently, the signal integrity analyzer 1400 performs a representative azimuth value of the transmitting source estimated based on the received signal for each channel.

and the actual azimuth value of the target geometrically calculated based on the location of the transmitter and the PCL system 1000

is compared to select a candidate transmitter.

와 실제 방위각

의 차이가 특정 오차범위인 e_th이내를 만족하는 지 여부를 확인한다.First, the representative azimuth value estimated for each channel as shown in Equation 1 below

and actual azimuth

Check whether the difference in satisfies within a specific error range, e _th .

Here, e _th may be determined by the user based on an allowable range such as interference on a visible distance between transmission and reception and interference from surrounding clutter. The signal integrity analyzer 1400 may select at least one transmitting source that satisfies an error range among a plurality of transmitting sources as a first transmitting source.

이외에 다른 방위에서 간섭신호가 존재하는지를 판단한다.Next, the signal integrity analyzer 1400 determines the presence of an interference signal with respect to the signal of one of the first transmitters, the representative azimuth value of the target estimated for each transmitter in the selected candidate list.

In addition, it is determined whether an interference signal exists in another orientation.

이외의 방위를 가지며, 즉, 제 1 송신원 중 하나의 송신원의 추정된 위치와는 상이한 위치에 존재하며, 신호의 크기가 소정의 크기 이상이고 표적의 방위 추정에 사용된 상기 제 1 송신원과 동일 주파수를 사용하는 제 2 송신원에 대한 간섭 신호가 존재하는 제 1 송신원을 표적 위치 탐지를 위한 송신원에서 제외할 수 있다. 또한, 신호무결성 분석부(1400)는 제외된 송신원을 미선정 송신원 리스트에 저장할 수 있다.The signal integrity analyzer 1400 is a representative azimuth estimated for one of the first transmitting sources.

has a direction other than that of the first transmission source, that is, is present at a location different from the estimated location of one of the first transmission sources, has a signal magnitude greater than a predetermined magnitude, and has the same frequency as the first transmission source used for estimating the target's azimuth. A first transmission source having an interference signal for a second transmission source using ? may be excluded from transmission sources for target location detection. In addition, the signal integrity analyzer 1400 may store the excluded transmitters in the non-selected transmitter list.

Thus, the multi-static PCL system 1000 according to an embodiment of the present invention can select a transmission source suitable for target position detection with less interference signal.

The signal strength analysis unit 1500 measures the signal strength of each of the M transmission sources 200-1, ..., 200-M, and selects a transmission source suitable for the multi-static PCL system 1000 to detect a target in the area of interest. can be selected

First, the intensity P _D of the reference signal received by the multistatic PCL system 1000 may be expressed as Equation 2 below.

는 송신원 신호의 파장, R₀는 송수신기간 거리 및 L은 멀티스태틱 PCL 시스템(1000)의 시스템 손실을 나타낼 수 있다. Here, P _T is the transmit power of the transmitter, G _T is the antenna gain of the transmitter, _GR is the antenna gain of the multistatic PCL system 1000,

Is the wavelength of the source signal, R ₀ is the distance between the transmitter and receiver, and L may represent the system loss of the multistatic PCL system 1000.

Subsequently, the intensity P _S of the target reflection signal reaching the multistatic PCL system 1000 after the signal transmitted from the transmitter is reflected by the target may be expressed as Equation 3 below.

Here, S ₀ may represent a radar cross section (RCS) of a target, R ₁ may represent a distance between a transmitter and a target, and R ₂ may represent a distance between the target and the multistatic PCL system 1000 .

At this time, the signal strength analyzer 1500 may calculate the minimum received signal strength capable of detecting a target located in the region of interest using Equations 2 and 3 as shown in Equation 4 below.

Here, P _Rmin represents the strength of the minimum detectable target reflection signal according to the target reflection signal detection capability of the multistatic PCL system 1000, R ₁ represents the distance between the target located in the region of interest and the transmitter, and R ₂ is It represents the distance between the target and the multistatic PCL (1000), and S ₀ may represent the target RCS.

The signal strength analysis unit 1500 measures the received signal strength for each transmitting source, determines whether the measured strength of the reference signal of the transmitting source satisfies Equation 4, and sets the transmitting source satisfying Equation 4 as the transmitting source for detecting the location of the target. can be selected Also, the signal strength analyzer 1400 may store transmitters that do not satisfy Equation 4 in the unselected transmitter list.

The signal quality continuity analyzer 1600 may analyze whether signal quality continuity is satisfied for each transmission source using the TDOA/FDOA result estimated by performing coherent processing in the signal processor 1130.

The result of target detection through coherent processing can be expressed as a TDOA/FDOA value, and when the signal quality persistence analyzer 1600 continuously detects and maintains the TDOA/FDOA value for targets within the detection range, the transmitting source It can be judged that the continuity of the signal quality of is excellent.

In addition, the signal quality continuity analyzer 1600 may determine that the higher the number of detected TDOA/FDOA values, the higher the possibility that the corresponding transmitter can detect multiple targets. Accordingly, the signal quality continuity analyzer 1600 may first select a transmitter having a large number of detected TDOA/FDOA values as a transmitter for target location detection. The signal quality continuity analyzer 1600 may determine that signal quality continuity is satisfied as much as a predetermined number set by the user among the transmitters arranged in priority order. The standard for satisfying signal quality continuity can be set by the user according to the operating environment.

In addition, the signal quality continuity analyzer 1600 may store, as a result of the signal quality continuity analysis, a transmitter that does not satisfy a predetermined criterion in an unselected transmitter list.

4 is a graph for confirming the continuity of signal quality for each transmission source under a specific condition according to an embodiment of the present invention.

Referring further to (a) of FIG. 4, in the case of 104.1 MHz, the TDOA value is continuously detected as 200 μs or less between 150 and 180 seconds, but the TDOA value is not continuously detected in other time zones. . Meanwhile, further referring to (b) of FIG. 4 , in the case of the TDOA estimation result of 101.5 MHz, it can be confirmed that the TDOA value is continuously detected at 500 μs or less. In addition, when comparing the number of detected TDOAs, it can be seen that more TDOAs are detected in the TDOA estimation result of 101.5 MHz than the number of TDOAs detected in the TDOA estimation result of the 104.1 MHz channel. Accordingly, the signal quality continuity analyzer 1600 may first select a transmitter of the 101.5 MHz channel according to the signal quality continuity analysis.

Referring back to FIG. 2 , the transmission source selection unit 1700 determines the location of the target selected by the signal integrity analysis unit 1400, the signal strength analysis unit 1500, and the signal quality continuity analysis unit 1600. A sender can be selected.

More specifically, the transmission source selection unit 1700 may select a final transmission source according to the maximum number L of transmission sources that the multistatic PCL system 1000 will use in advance. First, the transmitter selector 1700 assigns a positive first weight to a transmitter that satisfies signal integrity, and assigns a positive second weight to a transmitter that satisfies a certain signal strength and signal quality. A third weight having a positive value may be assigned to a transmitter satisfying persistence. The first to third weights may be previously set by a user according to an environment for target detection.

Then, for each transmitting source, the transmitting sources may be arranged in an order in which the sum of the first to third weights is high, and the priority of the transmitting sources for final selection of the transmitting sources may be determined according to the arranged order. The weight may be arbitrarily set by the user according to the user's operating environment.

In addition, according to an embodiment of the present invention, the transmitter selection unit 1700 selects a transmitter that is not selected by the signal integrity analyzer 1400, the signal strength analyzer 1500, and the signal quality continuity analyzer 1600 as an unselected transmitter. Can be managed as a list. Subsequently, the sender selector 1700 may determine a weight value according to an analysis result for each sender in the unselected sender list, and determine a priority among the unselected senders. For priority among unselected transmitters, the transmitter selector 1700 assigns a positive first weight to an unselected transmitter that satisfies signal integrity, and a second weight with a positive value to an unselected transmitter that satisfies a certain signal strength. And a third weight having a positive value may be assigned to an unselected transmitting source that satisfies signal quality persistence. The first to third weights may be previously set by a user according to an environment for target detection.

Next, for each unselected transmitter, the unselected transmitter may be arranged in an order in which the sum of the first to third weights is higher, and the priority of the unselected transmitter for final selection of the transmitter may be determined according to the arranged order. The weight may be arbitrarily set by the user according to the user's operating environment.

When the number of candidate senders is less than the maximum number L of senders, the sender selection unit 1700 may select an additional sender from the unselected sender list and select a final sender.

FIG. 5 is a block diagram illustrating an apparatus for selecting a transmitter for a multistatic PCL system according to an embodiment of the present invention in terms of hardware.

The multistatic PCL system 1000 may include a storage device 1810, a processor 1820, a receiving device 1830, an input interface device 1840, and an output interface device 1850.

Each of the components 1810, 1820, 1830, 1840, and 1850 included in the multistatic PCL system 1000 are connected by a data bus 1860 to communicate with each other.

The storage device 1810 may include at least one of a memory or a volatile storage medium and a non-volatile storage medium. For example, the storage device 1810 may include at least one of a read only memory (ROM) and a random access memory (RAM).

The storage device 1810 may store a program executed by the processor 1820 to be described later.

The processor 1820 may include a central processing unit (CPU), a graphics processing unit (GPU), a micro controller unit (MCU), or a dedicated processor on which methods according to embodiments of the present invention are performed. can mean

Referring further to FIG. 2 , as described above, the processor 1820 includes a signal receiving unit 1100, a signal processing unit 1130, a location detection unit 1150, It can perform functions of signal integrity analysis unit 1400, signal strength analysis unit 1500, signal quality continuity analysis unit 1600, and source selection unit 1700, each of which is a memory in the form of at least one module. stored in and executed by the processor.

Further referring to FIG. 3 , the receiving device 1830 may include an array antenna 1112 and may directly receive signals from a plurality of transmission sources or receive signals reflected from a plurality of targets.

In addition, the receiving device 1830 may include a signal measurer 1114 and convert RF signals received from a plurality of transmission sources and RF signals received after being reflected by a plurality of targets into digital signals.

The input interface device 1840 may receive at least one control signal from a user. For example, the input interface device 1840 may receive an input signal to reset a transmitter for target detection, and may receive weights for signal integrity, signal strength, and signal quality persistence in advance according to the user's target detection purpose. there is. The input weight for each stage may be stored in the storage device 1810 .

The output interface device 1850 may output and visualize at least one piece of information related to transmission source selection by the operation of the processor 1820 .

In the above, the multistatic PCL system 1000 according to an embodiment of the present invention has been described. Hereinafter, an operating method of the multistatic PCL system executed by a processor operation in the multistatic PCL system 1000 according to another embodiment of the present invention will be described.

6 (a) and (b) are flowcharts illustrating a method for selecting a transmitter in a PCL system according to an embodiment of the present invention.

Referring to FIGS. 1, 5 and 6 (a), first, the receiving device 1830 transmits reference signals emitted from M transmitting sources 200-1, ..., 200-M and M transmitting sources 200 -1, ..., 200-M) may receive a target reflection signal reflected by the moving target 100 (S1010). The receiving device 1830 may convert the received reference signal and target reflection signal into I/Q data (S1020).

Next, the processor 1820 analyzes signal integrity including the following two steps using the converted I/Q data to select a transmitter candidate to be used for target location detection (S1100).

In order to analyze the signal integrity, as a first step, the processor 1820 uses the I/Q data to estimate the direction of the transmitting source and the predetermined PCL system 1000 and M transmitting sources 200-1, ..., 200-M), it is determined whether the difference in the actual orientation of the transmitting source calculated through the geometrical positional relationship is within a predetermined error range (S1110).

Subsequently, if the orientation difference is within a predetermined error range (YES in S1110), the processor 1830, in a second step, determines the interference signal received at the same frequency and having a predetermined magnitude or more in addition to the estimated bearing of the transmitting source estimated in the first step. It is determined whether there is (S1120).

The processor 1830 may select a transmitting source for target location detection as a transmitting source that satisfies signal integrity if there is no interference signal of a predetermined level or higher in the second step (No in S1120).

That is, in the signal integrity analysis step (S1100), the processor 1820 can accurately detect the location of the target and select a transmitting source that is less affected by other interference signals as a transmitting source for detecting the location of the target.

As a signal strength analysis step, the processor 1820 analyzes the signal strength received from the transmitter and determines whether it is greater than or equal to a predetermined level (S1200). This is because the target located in the region of interest can be detected only when the received signal has a certain strength.

In addition, the processor 1820 performs coherent processing on the received I/Q signal and determines how often and how many times the FDOA and TDOA of the transmitting source are detected as a step of analyzing whether the signal quality of the transmitting source is satisfied or not. It is possible to determine whether quality continuity is satisfied (S1300).

In each step of analyzing signal integrity, signal strength, and signal quality continuity, the processor 1820 classifies transmitting sources that do not satisfy the conditions as unselected transmitting sources and generates an unselected transmitting source list (S1410), It is possible to calculate the priority of unselected transmitters by weighting them (S1420). Subsequently, the storage device 1810 may store priorities of unselected and unselected transmitters, and when the number of transmitters for detecting the position of a target, which will be described later, is less than a predetermined number (No in S1440), the stored unselected transmitters and unselected transmitters It can be selected as the final transmitter for target position detection using priority.

The processor 1820 may generate a list of candidate transmitters for detecting a location of a target for transmitters satisfying signal integrity, signal strength, and signal quality continuity (Yes in S1300) and store them in the storage device 1810 (S1430).

Subsequently, the processor 1820 may determine whether the number of candidate transmitters stored in the storage device 1810 is greater than the maximum number L of transmitters available for target location detection (S1440).

If the number of sender candidates stored in the storage device 1810 is greater than the maximum number L of senders (Yes in S1440), the processor 1820 performs a weighting factor set by the user in each step of analyzing signal integrity, signal strength, and signal quality persistence. , it is possible to calculate the priority of the candidate transmission source (S1450).

If the number of candidate senders stored in the storage device 1810 is not greater than the maximum number of senders L (No in S1440), the processor 1820 determines the maximum number of senders according to the priorities of unselected senders and unselected senders stored in the storage device 1810. According to the number L of transmitters, additional transmitters for target position detection may be selected (S1460).

If the number of transmitters for target location detection is filled up to the maximum number L of transmitters, the selected transmitter may be selected as the final transmitter for target location detection (S1470).

At a point in time after the transmitter is selected, the processor 1820 determines the positioning contribution of the selected final transmitter when the environment or purpose for target position detection is changed, and, if necessary, changes the transmitter for target position detection. can In addition, the processor 1820 may periodically re-select a transmitter according to a purpose, such as when a user's area of interest for target position detection changes or when a specific area is intensively detected.

In the selection method according to the embodiment of the present invention, some steps are omitted or, if necessary, the multi-static PCL system 1000 is generally used according to the operator's operating method, purpose, performance of the multi-static PCL system 1000, and operating environment. It is possible to select a sender by adding a step used to select a sender.

Combinations of each block of the block diagram and each step of the flowchart accompanying the present invention may be performed by computer program instructions. Since these computer program instructions may be loaded into an encoding processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, the instructions executed by the encoding processor of the computer or other programmable data processing equipment are each block or block diagram of the block diagram. Each step in the flow chart creates means for performing the functions described. These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the function described in each block of the block diagram or each step of the flow chart. The computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. It is also possible that the instructions performing the processing equipment provide steps for executing the functions described in each block of the block diagram and each step of the flowchart.

Additionally, each block or each step may represent a module, segment or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative embodiments it is possible for the functions recited in blocks or steps to occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may sometimes be performed in reverse order depending on their function.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential qualities of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: target
200: sender
1000: PCL system
1100: target position prediction unit
1110: signal receiving unit
1130: signal processing unit
1150: location detection unit
1400: signal integrity analysis unit
1500: signal strength analysis unit
1600: signal quality continuity analysis unit
1700: transmission source selection unit

Claims (13)

A transmitter selection method for detecting a plurality of targets performed by a system for receiving an RF signal including an antenna, the method comprising:
obtaining, by the antenna, a reference signal directly received from a plurality of transmitting sources and a reflected signal transmitted from the plurality of transmitting sources and reflected to the plurality of targets;
Based on the received reference signal and the reflected signal, among the plurality of transmitting sources, an orientation difference between a first bearing, which is an estimated bearing of each of the plurality of transmitting sources, and a second bearing, which is an actual bearing of each of the plurality of transmitting sources, is determined by a predetermined value. selecting at least one first transmitting source within a range; and
Based on an interference signal with respect to the reference signal of the first transmission source transmitted by a second transmission source different from any one of the first transmission sources, a third transmission source among the at least one first transmission source is used to detect the plurality of targets. Including the step of selecting a candidate transmitter for
How to select a sender. According to claim 1,
The first bearing is a bearing obtained by estimating the bearing of the transmission source using a received reference signal and a received reflected signal using a receiving bearing calculation algorithm;
The second bearing is a bearing obtained by geometrically calculating an actual bearing of the target using a predetermined positional relationship between the plurality of transmitting sources and a system receiving the RF signal.
How to select a sender. According to claim 2,
The second transmission source is located in an area other than the first bearing of the first transmission source, the strength of the reference signal of the second transmission source is greater than or equal to a predetermined signal strength, and the frequency of the reference signal of the second transmission source is 1 same as sender
How to select a sender. According to claim 1,
measuring a time difference of arrival (TDOA) or frequency difference of arrival (FDOA) according to time for each of the plurality of transmitting sources, based on the received reference signal and the reflected signal;
determining whether signal quality continuity is satisfied based on TDOA or FDOA of the plurality of transmission sources; and
Further comprising the step of selecting a candidate transmitter for detecting the plurality of targets in consideration of whether the signal quality continuity is satisfied
How to select a sender. According to claim 4,
analyzing signal strengths to determine whether strengths of reference signals transmitted from the plurality of transmitters are greater than or equal to a predetermined value; and
Further comprising the step of selecting a candidate transmitter for detecting the plurality of targets by further considering the signal strength
How to select a sender. According to claim 5,
determining whether the selected number of candidate transmission sources for target detection is greater than or equal to a predetermined number;
if the number of candidate transmitters for target detection is greater than or equal to a predetermined number, prioritizing the candidate transmitters; and
Maintaining the candidate transmitters up to a predetermined number in order of highest priority.
How to select a sender. According to claim 5,
determining whether the selected number of candidate transmission sources for target detection is greater than or equal to a predetermined number;
if the number of candidate transmitters for target detection is less than a predetermined number, determining a priority among at least one fourth transmitter different from the candidate transmitter selected from among the plurality of transmitters; and
Adding candidate transmitters for target detection by a difference in the number of candidate transmitters for target detection from the predetermined number in order of highest priority among the fourth transmitters.
How to select a sender. According to claim 6 or 7,
The priority is,
A predetermined first weight, which is a positive value, is assigned to the third transmitting source in which the difference in orientation between the first and second orientations is within a predetermined range, and a positive value is applied to at least one transmitting source that satisfies the signal quality persistence. A preset second weight is assigned, and a positive third weight is assigned to a transmitter whose signal strength of the plurality of transmitters is greater than or equal to a predetermined value, and the sum of the first to third weights for each transmitter is obtained. The rank in which the senders are arranged in ascending order
How to select a sender. According to claim 1,
If the purpose of detecting the target is changed after the point at which the source for detecting the position of the target is selected,
obtaining, by the antenna, a reference signal directly received from the plurality of transmission sources and a reflected signal transmitted from the plurality of transmission sources and reflected by the plurality of targets;
Based on the received reference signal and the reflected signal, among the plurality of transmitting sources, an orientation difference between a first bearing, which is an estimated bearing of each of the plurality of transmitting sources, and a second bearing, which is an actual bearing of each of the plurality of transmitting sources, is determined by a predetermined value. selecting at least one first transmitting source within a range; and
Among the at least one first transmission source, at least one third transmission source is selected as the plurality of targets based on an interference signal of a second transmission source different from any one of the first transmission sources and the reference signal of the first transmission source. Re-performing the step of selecting a candidate sender for detection,
How to select a sender. According to claim 9,
The purpose is
Including the case where the position of the plurality of targets is changed or the position of a specific target among the plurality of targets is detected
How to select a sender. A transmitter selection method for detecting a plurality of targets in a system for receiving an RF signal including an antenna, comprising:
receiving, by the antenna, a reference signal transmitted from a plurality of transmission sources and a reflected signal transmitted from the plurality of transmission sources and reflected on the target;
measuring a time difference of arrival (TDOA) or frequency difference of arrival (FDOA) according to time for each of the plurality of transmitting sources, based on the received reference signal and the reflected signal;
determining whether signal quality continuity is satisfied based on TDOA or FDOA of the plurality of transmission sources; and
Selecting at least one transmitting source that satisfies the signal quality persistence as a candidate transmitting source for detecting the plurality of targets.
How to select a sender. According to claim 11,
The step of determining whether the signal quality continuity is satisfied,
determining whether TDOA or FDOA of the plurality of transmitters is periodically measured;
prioritizing the plurality of transmitters in an order in which the number of measured TDOAs or FDOAs of the plurality of transmitters is greater; and
Arranging in the order of highest priority among the plurality of transmitters and determining that signal quality continuity is satisfied by a predetermined number of transmitters in ascending order
How to select a sender. an antenna for obtaining a reference signal directly received from a plurality of transmission sources and a reflected signal transmitted from the plurality of transmission sources and received after being reflected on a plurality of targets; and
Based on the received reference signal and the reflected signal, among the plurality of transmitting sources, an orientation difference between a first bearing, which is an estimated bearing of each of the plurality of transmitting sources, and a second bearing, which is an actual bearing of each of the plurality of transmitting sources, is determined by a predetermined value. At least one first transmission source within a range is selected, and among the at least one first transmission source, a second transmission source different from any one of the first transmission sources is based on an interference signal with respect to the reference signal of the first transmission source. Including a processor for selecting at least one third transmitting source as a candidate transmitting source for detecting the plurality of targets,
Sender selection device.

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