KR20200084724A - Method and Apparatus of Multi-Target Positioning for Multistatic PCL System - Google Patents

Abstract

According to the present invention, provided is a multi-target positioning method in a multi-static PCL system, which may be performed by a target information estimating device. On the other hand, the multi-target positioning method comprises the processes of: selecting a reference broadcast band in accordance with a specific criterion and sorting the remaining broadcast bands in order to perform identical target matching; calculating an effective distance range and an effective Doppler range, and comparing effective distance ranges between receivers; and comparing the effective Doppler range and estimating a location of the target based on the bistatic distance information set with respect to a target index of the matching list. Target matching is composed of a simple comparison process, so that the time delay for matching the same target can be minimized.

Description

Method and Apparatus of Multi-Target Positioning for Multistatic PCL System}

The present invention relates to a method and apparatus for multiple target positioning for a multistatic PCL system.

To detect the location of the target using the time difference between the time when a third transmission signal directly arrives at the receiver and the time signal reflected by the target arrives at the receiver, such as FM (Frequency Modulation) and DMB (Digital Multimedia Broadcasting) broadcasting. Passive Coherent Location (PCL)-based passive location detection technology is emerging as a threat detection technology for electronic support (ES) equipment in the defense sector, especially Electronic Warfare (EW), as well as civilian sectors such as regional surveillance.

In particular, in a multi-static PCL-based passive position detection system using broadcast signals from multiple transmitters, three or more transmitters are required to estimate the 3D position of a target, and the broadcast signal emitted from each transmitter is directly received by the receiver. The target position is estimated by using bistatic range information, which is a distance difference between a signal path and a path reflected by the target and received. In this environment, in the case of multiple targets with a large number of targets, theoretically, the bistatic distance information of the number of targets for each source is estimated. Therefore, in order to accurately estimate the multiple targets, the same target matching process must be preceded by accurately matching bistatic distance information according to each target for each source.

On the other hand, in the multi-static PCL-based passive location detection technology, as the number of transmission sources used increases, the performance of location estimation improves, and as many transmission sources as possible are used to have accurate location detection performance. However, as the number of transmission sources used increases, there is a problem in that the number of cases in which bistatic distance information can be matched in the same target matching process increases exponentially.

Therefore, the existing method that considers the number of cases in which the bistatic distance information can be matched in the same target matching process has a problem in that its computation amount is greatly increased, which may interfere with system operation. Therefore, there is a need for the same target matching method having a small amount of computation.

Accordingly, it is an object of the present invention to provide a method and apparatus for multiple target positioning for a multistatic PCL system.

In addition, it is an object of the present invention to provide a method and apparatus for multi-target positioning for a multi-static PCL system using the same target matching method with a small amount of computation.

In the multi-static PCL system according to the present invention for solving the above problems, a method for estimating multiple target locations is provided, and the method can be performed by a target information estimating apparatus. Meanwhile, the multi-target location estimation method includes: selecting a reference broadcast band according to a specific criterion and sorting the remaining broadcast bands in order to perform the same target matching; Calculating an effective distance range and an effective Doppler range, and comparing the effective distance range between receivers; And comparing the effective Doppler range and estimating the position of the target based on the bistatic distance information set with respect to the target index of the matching list, wherein the target matching consists of a simple comparison process and delays time for matching the same target. Can be minimized.

According to an embodiment, after the process of estimating the position of the target, it is checked whether the number of target indices in the matching list matches the number of targets, and if the number of target indices is greater than the number of targets, the estimated target The process of resolving the ambiguity of the estimated position through the process of integrating or deleting the target within a specific distance by checking the position may be further included.

과 두 번째 방송대역의 첫 번째 표적에 대한 유효거리범위인

가 겹치는 범위 여부를 비교할 수 있다.According to an embodiment, in the process of comparing the effective distance range, the effective distance range for the first target of the first broadcast band that is the reference broadcast band

And the effective distance range for the first target of the second broadcast band

You can compare whether or not the overlapping ranges.

를 According to an embodiment, when the overlapping range exists, the first target T(1,1) of the first broadcast band and the first target T(2,1) of the second broadcast band are associated. And the effective range between the two targets,

To

에 의해 업데이트할 수 있다.

Can be updated by

에 포함되는지를 확인하고, 상기 최종 유효거리범위 범위에 포함되지 않는 표적 리스트를 매칭리스트에서 삭제할 수 있다.According to an embodiment, in the process of resolving the ambiguity of the estimated position, the distance between the estimated target position and the receiver is the final effective distance range derived in the process of comparing the effective distance range

Check whether it is included in, and the target list not included in the final effective range range can be deleted from the matching list.

According to an embodiment, in the process of estimating the position of the target, based on the bistatic distance information set, the matching process in the lower branch is performed only when matching is made in the branch in the tree structure. By performing, it is possible to reduce the amount of computation.

According to an embodiment, in the process of estimating the position of the target, the level of the tree structure may be dynamically changed according to the increase or decrease of the number of transmission sources. At this time, if the number of transmission sources is 2N, the tree structure is set to the N level, and if the number of transmission sources is N and the number of interference sources is K, the tree structure is set to the (N+K) level, but the interference level is set. K can be dynamically adjusted accordingly.

Meanwhile, a multi-target positioning device is provided in a multi-static PCL system according to another aspect of the present invention. In order to perform the same target matching, the multi-target location estimation apparatus selects a reference broadcast band according to a specific criterion, sorts the remaining broadcast bands, calculates an effective distance range and an effective Doppler range, and compares an effective distance range between receivers. Target information estimating device configured to; And a position detecting device that compares the effective Doppler range and estimates the position of the target based on the bistatic distance information set with respect to the target index of the matching list, wherein the target matching consists of a simple comparison process for the same target matching. Time delay can be minimized.

Particularly, according to the present invention, in the same target matching step using the estimated bistatic distance, since the matching process in the lower branch is performed only when matching in the upper branch in the tree structure, the computation amount is greatly reduced. It has the advantage of being able to.

In addition, according to the present invention, there is an advantage that it is easy to implement because only the level of the tree structure can be dynamically changed according to the increase or decrease in the number of transmission sources.

In addition, the matching according to the present invention has the advantage that it is composed of a simple comparison process to minimize the time delay for matching the same target.

1 is a view showing a multi-static PCL system in a multi-target environment according to the present invention.
2 is a view showing the flow and apparatus of a multi-static PCL system according to the present invention.
3 is a view showing the flow of target position estimation of the multi-static PCL system according to the present invention.
4 is a view showing an example of a bistatic distance / bistatic Doppler distribution according to the present invention.
5 is a view showing an example of calculating the effective distance range according to the present invention.
6 is a view showing an example of performing an effective distance range comparison according to the present invention.

The above-described features and effects of the present invention will become more apparent through the following detailed description in connection with the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. Will be able to.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included.

In describing each drawing, similar reference numerals are used for similar components.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. The term and/or includes a combination of a plurality of related described items or any one of a plurality of related described items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains.

Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Should not.

The suffix modules, blocks, and parts for components used in the following description are given or mixed only considering the ease of writing the specification, and do not have a meaning or a role that is distinguished from each other.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described so that those skilled in the art can easily carry out. In the following description of embodiments of the present invention, when it is determined that detailed descriptions of related well-known functions or known configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

Hereinafter, a method and apparatus for multi-target positioning in the multi-static PCL system according to the present invention will be described in detail with reference to the drawings.

In this regard, FIG. 1 is a diagram showing a multi-static PCL system in a multi-target environment according to the present invention.

First, in the multi-static PCL location detection system considered in the present invention, as shown in FIG. 1, the receiver 1 is installed, and a broadcast signal transmitted from a third transmission source 2 such as a plurality of FMs and DMBs is a receiver. (1) The difference between the arrival time of the reference signal (4) received directly and the arrival time of the target reflection signal (5) reflected by the target (3) and received by the receiver (1) is estimated and converted into a distance. The location estimation is performed based on the bistatic range information.

On the other hand, Figure 2 is a view showing the flow and apparatus of a multi-static PCL system according to the present invention.

2, the broadcast signal receiving unit 110 of the signal receiving device 100, the signal separation unit 210 for each broadcast band of the target information estimating device 200, the reference signal / target reflection signal separation unit (220), bi-static distance / bi-static Doppler estimation unit 230, the target location estimation unit 310 of the location detection device 300, the target location tracking unit 320 and the result display unit in the display device 400 ( 410).

First, the receiver 1 receives a broadcast signal transmitted from each transmitting source 2 through the signal receiving device 100 composed of a plurality of antennas, etc., to the receiving unit 110, and according to the broadcasting bands of the target information estimating device 200 The signal separation unit 210 separates signals for each broadcast band of a frequency selected by the operator.

Thereafter, the reference signal/target reflection signal separation unit 220 separates the reference signal 4 and the target reflection signal 5 through signal processing processes such as beamforming for each broadcasting band, and cross-correlate the two signals (cross- Through the signal processing process such as Correlation, the bistatic distance information and the bistatic doppler information for each broadcasting band are estimated by the bistatic distance/bistatic Doppler estimator 230. Subsequently, in the target location estimator 310 of the location detecting device 300, the bistatic distance and the bistatic Doppler information for the same target are matched for each broadcast band, and each target 3 is based on the matched bistatic distance information. ). When the location estimation is completed, the estimated target location information is performed by the target location tracking unit 320 through a signal processing process such as a tracking filter, and finally, the movement path of multiple targets is displayed on the display device 400. Results are shown to the operator through the display unit 410.

On the other hand, after the signal separation in the signal separation unit 210 for each broadcast band, the reference signal / target reflection signal separation and bi in the reference signal / target reflection signal separation unit 220 and the bistatic distance / bistatic Doppler estimation unit 230 The process of estimating the static distance/biased Doppler can be processed in parallel for each broadcasting band. Similarly, after the position estimation for the target in the target position estimation unit 310, the position tracking in the target position tracking unit 320 can be processed in parallel for each target.

On the other hand, Figure 3 is a view showing the flow of the target location estimation of the multi-static PCL system according to the present invention.

3 conceptually illustrates a flowchart of the target location estimator 310 according to the present invention. First, it is determined whether it is necessary to perform the same target matching (311). The same target matching process may be performed when there is no matching history or when the number of targets detected during system operation is changed and the number of bistatic distance/bistatic Doppler information pairs for each broadcast band is changed.

개로 동일하다고 가정하고, 방송대역의 개수는

개로 가정할 수 있다.For ease of explanation of the present invention, the number of bistatic distance/bistatic Doppler information pairs estimated by the target information estimating apparatus 200, that is, the number of targets is determined for each broadcast band.

Assuming that they are the same, the number of broadcasting bands is

Can be assumed to be a dog.

On the other hand, Figure 4 is a view showing an example of a bistatic distance / bistatic Doppler distribution according to the present invention. 5 is a diagram showing an example of calculating an effective distance range according to the present invention.

, 표적의 개수가 3개

인 경우의 표적정보추정장치(200)에서 추정된 바이스태틱 거리/바이스태틱 도플러 분포의 일례를 보여준다.4, the number of broadcast bands is four

, The number of targets is 3

Shows an example of the bistatic distance / bistatic Doppler distribution estimated by the target information estimator 200 in the case of.

First, when it is determined that the same target matching is necessary, to perform the same target matching, a reference broadcasting band is selected according to a specific criterion, and the remaining broadcasting bands are aligned (312).

Thereafter, a process of calculating an effective distance range and an effective Doppler range (313) is performed. The effective distance range is the range of the distance that the target can be located relative to the receiver. By using the characteristics of the ellipse, which is a set of positions where the receiver and its transmitting source are two focal points and the bistatic distance is constant, It is calculated for each static distance information.

[Equation 1]

은

번째 방송대역의

번째 표적의 유효거리범위,

은

번째 방송대역의

번째 표적의 바이스태틱 거리,

은 수신기와 송신원 사이의 거리, 그리고

는 시스템의 바이스태틱 거리 추정 오차를 나타낸다. 도 5는 유효거리범위 산출의 일례를 보여준다.here,

silver

Of the first broadcasting band

Effective range of the target,

silver

Of the first broadcasting band

The target's bistatic distance,

Is the distance between the receiver and the source, and

Indicates the system's bistatic distance estimation error. 5 shows an example of calculating the effective distance range.

The effective Doppler range is the maximum difference value of all the broadcast bands of the bistatic Doppler for the same target. It considers the distance between the receiver and the transmitter, the minimum/maximum distance to the target, and the minimum/maximum moving speed of the target. It is calculated as follows.

[Equation 2]

은 유효도플러범위,

는 운용자가 고려하는 환경에서 도출될 수 있는 바이스태틱 도플러의 범위이다.here,

Is the effective Doppler range,

Is a range of bistatic Dopplers that can be derived from the environment considered by the operator.

과 두 번째 방송대역의 첫 번째 표적에 대한 유효거리범위인

가 겹치는 범위 여부를 비교한다. 이 때, 겹치는 범위가 존재하면 첫 번째 방송대역의 첫 번째 표적인 T(1,1)과 두 번째 방송대역의 첫 번째 표적인 T(2,1)을 연관(association)시키고 두 표적 간의 유효거리범위,

를 다음과 같이 겹치는 범위로 업데이트한다.Thereafter, a process of comparing the calculated effective distance range (314) is performed. First, the effective distance range for the first target of the first broadcast band, which is the reference broadcast band,

And the effective distance range for the first target of the second broadcast band

Compare whether or not the overlapping range. At this time, if there is an overlapping range, the first target T(1,1) of the first broadcast band and the first target T(2,1) of the second broadcast band are associated and the effective distance between the two targets range,

Update to the overlapping range as follows.

[Equation 3]

On the other hand, if there is no overlapping range, T(1,1) and T(2,1) are not associated, so comparison with all effective distance ranges for the remaining broadcast bands is not performed. There is no need to perform a comparison on numbers. Thereafter, the effective distance range comparison for all targets of the remaining broadcast bands is sequentially performed, and the related cases are updated to the final range, and the target indexes of the related cases for all broadcast bands are recorded in the matching list.

On the other hand, Figure 6 is a view showing an example of performing an effective distance range comparison according to the present invention. That is, FIG. 6 shows an example of comparing the effective distance range based on T(1,1).

The ‘X’ in FIG. 6 indicates that there is no overlapping range, so that it is not related, and if it is not related at the upper branch of the tree, the comparison of the lower branch is not performed, so that the computation amount can be greatly reduced. 6, when T(1,1) is a reference, six cases have successfully matched in the effective distance range comparison 314, and the target index according to the order of the broadcast band is (1). ,1,1,1), (1,1,1,2), (1,1,1,3), (1,3,1,1), (1,3,1,2), (1 ,3,1,3). Thereafter, the same process is sequentially performed for the remaining targets T(1,2) and T(1,3) of the reference broadcast band.

보다 작으면 연관되었다고 판단하여 매칭리스트에 남겨두고,

보다 크면 연관되지 않았다고 판단하여 해당 표적 인덱스를 매칭리스트에서 삭제한다.When the process of comparing the effective distance range 314 is completed, the process of comparing the effective Doppler range 315 for all target indices recorded in the matching list is performed. The effective Doppler range is the difference between the maximum value and the minimum value of the bistatic Doppler values of the target for each broadcasting band included in the target index.

If it is smaller, it is judged as related and left in the matching list,

If it is larger, it is determined that it is not related, and the target index is deleted from the matching list.

가 되며, 각 방송대역의 송신원 위치와 바이스태틱 거리값을 이용하여 해당 표적의 위치를 추정하게 된다.After the effective Doppler range comparison (315), a target location estimation (316) is performed based on the bistatic distance information set for all target indices in the matching list. For example, if the target index is (1,2,2,3), the bistatic distance information set is

The target location is estimated by using the source location and the bistatic distance value of each broadcast band.

에 포함되는지를 확인하는 추정위치 유효거리범위 비교(317) 과정을 수행하여, 해당 유효거리범위 범위에 포함되지 않는 표적 리스트를 매칭리스트에서 삭제한다. 일례로, 위치추정에 사용된 바이스태틱 거리 정보 세트가

이면, 이를 기반으로 추정된 위치와 수신기 간의 거리를 계산하여

의 범위에 포함되는지 확인한다.When the process of estimating the location of the matching list 316 is completed, the estimated distance and the distance between the receivers are the final effective distance ranges derived in the comparison of the effective distance range 314

To perform the process of comparing the estimated distance effective distance range 317 to determine whether it is included in, the target list not included in the effective distance range is deleted from the matching list. As an example, a set of bistatic distance information used in location estimation

If it is, the distance between the estimated position and the receiver is calculated based on this

Check if it is included in the scope of.

After the process of comparing the estimated distance effective distance range (317), if the number of target indices and the number of targets in the matching list are identical, and if the number of target indices is greater than the number of targets, the estimated position of the target is checked and within a certain distance. The ambiguity of the estimated position is resolved (318) through the process of integrating or deleting the target.

On the other hand, in the target position estimation method according to the present invention, when the number of target indexes and the number of targets in the matching list match in the effective distance range comparison (314) process or the effective Doppler range comparison (315) process, the The target location estimation 316 is performed based on the static distance information set, and subsequent processes may be omitted.

로 정해져 이를 기반으로 표적의 위치추정을 수행할 수 있다.On the other hand, in the target location estimation method according to the present invention, when the number of targets is different for each broadcasting band, after performing the selection of the reference broadcasting band and performing the broadcasting band alignment 312 process, the remaining detailed processes are performed with similar or identical concepts to perform a matching list. You can write In this case, the target index in the matching list may not have targets for all broadcast bands. For example, if the target index is (1,1,2,N/A), the target for the fourth broadcast band is not associated, and the bistatic distance information set is

Based on this, it is possible to perform target location estimation.

On the other hand, when it is determined that the target location estimation method according to the present invention does not need the same target matching (311), the target location estimation 316 is performed based on the bistatic distance information set for all target indices in the latest matching list. can do.

On the other hand, the target location estimation method according to the present invention may be repeatedly performed whenever the signal of the target is received by the signal receiving device 100.

On the other hand, in the target location estimation method according to the present invention, the order of each detailed process within the target location estimation process 310 may be changed or omitted depending on the system operating environment or the environment of the target to be considered.

In the above, the multi-target positioning method in the multi-static PCL system according to the present invention has been described. Based on this, it will be described with respect to the differential technical features in the multi-target location estimation method in the multi-static PCL system according to the present invention and the configuration and operation for implementing these features.

First, referring to FIGS. 3 to 6, in the multi-static PCL system, the multi-target location estimation method selects a reference broadcast band according to a specific criterion and sorts the remaining broadcast bands in order to perform the same target matching (312) And calculating an effective distance range and an effective Doppler range (313) and comparing the effective distance range between receivers (314). In addition, the multi-target location estimation method, the effective Doppler range comparison (315), the target index of the matching list may further include a process of estimating the location of the target based on the bistatic distance information set (316). have.

On the other hand, after the process of estimating the position of the target (316), it is checked whether the number of target indexes in the matching list matches the number of targets, and if the number of target indexes is greater than the number of targets, the estimated target position By confirming 317, a process 318 of resolving the ambiguity of the estimated position may be performed through a process of integrating or deleting a target within a specific distance.

과 두 번째 방송대역의 첫 번째 표적에 대한 유효거리범위인

가 겹치는 범위 여부를 비교할 수 있다. 이때, 상기 겹치는 범위가 존재하면 상기 첫 번째 방송대역의 첫 번째 표적인 T(1,1)과 상기 두 번째 방송대역의 첫 번째 표적인 T(2,1)을 연관(association)시키고 두 표적 간의 유효거리범위,

를 수학식 3에 의해 업데이트할 수 있다.Meanwhile, in the process of comparing the effective distance range (314), the effective distance range for the first target of the first broadcast band, which is the reference broadcast band, is

And the effective distance range for the first target of the second broadcast band

You can compare whether or not the overlapping ranges. At this time, if the overlapping range exists, the first target T(1,1) of the first broadcast band and the first target T(2,1) of the second broadcast band are associated, and between the two targets. Effective distance range,

Can be updated by Equation 3.

에 포함되는지를 확인할 수 있다. 이에 따라, 상기 최종 유효거리범위 범위에 포함되지 않는 표적 리스트를 매칭리스트에서 삭제할 수 있다.On the other hand, in the process of solving the ambiguity of the estimated position (318), the distance between the estimated target position and the receiver is the final effective distance range derived from the effective distance range comparison process

You can check whether it is included in. Accordingly, a target list not included in the final effective range range may be deleted from the matching list.

On the other hand, in the process of estimating the position of the target (316), based on the bistatic distance information set, the matching process in the lower branch is performed only when matching is made in the branch in the tree structure. By doing so, it is possible to reduce the calculation amount. In this regard, referring to FIG. 6, n and m represent effective ranges of the m-th target of the n-th broadcast band, respectively. Therefore, the number of broadcast bands may be set to be less than or equal to the number of targets within a range that does not increase the target location estimation complexity.

On the other hand, in the process of estimating the position of the target (316), the level of the tree structure may be dynamically changed according to the increase or decrease of the number of transmission sources. Specifically, if the number of transmission sources is 2N, the tree structure may be set to N level.

On the other hand, in the process 316 of estimating the position of the target, the level of the tree structure may be dynamically changed according to the number of transmitting sources and the increase and decrease of the interference sources. Specifically, if the number of transmission sources is N and the number of interference sources is K, the tree structure may be set to (N+K) level. In addition, there is an advantage that the level of the tree structure can be dynamically changed by dynamically adjusting K according to the interference level. Here, the interference source may be any signal source other than the transmission source, and may be a jammer. In addition, the interference source may include an object that can be incorrectly detected as a target, such as a clutter.

For example, if the number of interference sources is K, but only K1 generates interference above a threshold, the tree structure can be reduced to the (N+K1) level. In addition, when the number of interference sources determined to cause interference above the second threshold by the receiver is determined to be K2, there is an advantage that the tree structure can be dynamically changed to the (N+K2) level. At this time, the determination of whether to cause interference above the second threshold to the receiver may be determined based on the radiation pattern and the interference pattern of the interference source, the radiation pattern and the position and direction of the receiver.

In the above, the multi-target positioning method and apparatus in the multi-static PCL system according to the present invention have been described. In this regard, the technical effects of the multi-target location estimation method and apparatus in the multi-static PCL system according to the present invention are as follows.

In a multi-static PCL-based passive location detection system using broadcast signals from multiple sources, target information matching for the same target is essential to perform location detection for multiple targets. The multi-expression location estimation method and apparatus according to the present invention configured as described above is based on the estimated target information, bistatic range and bistatic doppler information, for each broadcast band for the same target. The static distance information is matched, and in the final step, the location estimation result of the matching candidate list is matched to the desired number of targets using the value.

Particularly, according to the present invention, in the same target matching step using the estimated bistatic distance, since the matching process in the lower branch is performed only when matching in the upper branch in the tree structure, the computation amount is greatly reduced. It has the advantage of being able to.

In addition, according to the present invention, there is an advantage that it is easy to implement because only the level of the tree structure can be dynamically changed according to the increase or decrease in the number of transmission sources.

In addition, the matching according to the present invention has the advantage that it is composed of a simple comparison process to minimize the time delay for matching the same target.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included.

According to the software implementation, design and parameter optimization for each component as well as the procedures and functions described herein may be implemented as separate software modules. Software code can be implemented in a software application written in an appropriate programming language. The software code is stored in a memory and can be executed by a controller or processor.

1: Receiver
2: Sender
3: Target
4: Reference signal
5： Target reflection signal
100： Signal receiving device
200： Target information estimation device
300： Position estimation device
400： Exhibition device
110： Broadcast signal receiver
210: Signal separation unit for each broadcasting band
220: Reference signal / target reflection signal separation
230： Bi-static distance / Bi-static Doppler estimation unit
310： Target location estimation
320： Target location tracking
410： Result display
311: Judgment of the need for identical target matching
312: Selection of standard broadcasting bands / sorting of broadcasting bands
313: Effective distance range / effective Doppler range calculation
314： Effective distance range comparison
315: Effective Doppler range comparison
316： Matching list location estimation
317: Estimated position effective distance range comparison
318: Estimated position ambiguity resolution

Claims (7)

In a multi-target location estimation method in a multistatic PCL system, the method is performed by a target information estimation device, the method comprising:
Selecting a reference broadcast band according to a specific criterion and sorting the remaining broadcast bands to perform the same target matching; And
Calculating an effective distance range and an effective Doppler range, and comparing the effective distance range between receivers; And
And comparing the effective Doppler range and estimating the position of the target based on the bistatic distance information set with respect to the target index of the matching list. According to claim 1,
After the process of estimating the position of the target,
Check whether the number of target indexes and the number of targets in the matching list match, and if the number of target indexes is greater than the number of targets,
The method further comprising resolving the ambiguity of the estimated position through the process of integrating or deleting the target within a specific distance by checking the estimated target position. According to claim 1,
In the process of comparing the effective distance range,
The effective distance range for the first target of the first broadcast band, which is the reference broadcast band,

And the effective distance range for the first target of the second broadcast band

Multi-target positioning method, characterized in that to compare whether the overlapping range. According to claim 3,
If the overlapping range exists, the first target T(1,1) of the first broadcast band and the first target T(2,1) of the second broadcast band are associated and the effective distance between the two targets range,

To

Multi-target positioning method, characterized in that updated by. According to claim 2,
In the process of solving the ambiguity of the estimated position,
The estimated target position and the distance between the receiver is the final effective distance range derived in the process of comparing the effective distance range

Make sure it is included in,
A method for estimating multiple target locations, characterized in that the target list not included in the final effective range range is deleted from the matching list. According to claim 1,
In the process of estimating the position of the target,
Based on the bistatic distance information set, multi-target location estimation, characterized in that by performing a matching process in the lower branch only when matching in the upper branch (Branch) in the tree (Tree) structure, reducing the amount of computation Way. The method of claim 6,
In the process of estimating the position of the target,
A method of multi-target location estimation, characterized in that the level of the tree structure is dynamically changed according to the increase or decrease of the number of transmission sources.

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