External radiation source detection direct wave path error correction method, device, equipment, medium and program product

Abstract

The invention provides an external radiation source detection direct wave path error correction method, device and equipment, a medium and a program product, and the method comprises the steps: S1, constructing a relation between a known position information target and an unknown position information target according to a time difference measurement result; and S2, detecting a target with known position information, and positioning the target with the unknown position information by using the relationship between the target with the known position information and the target with the unknown position information. According to the method, correction of the direct wave path error is completed based on prior information, the problem that the positioning error is large when a non-intervisible external radiation source is used for external radiation source detection is solved, and the method enables the performance of a passive detection system based on the external radiation source to be more stable and the target positioning precision to be higher.

Description

Technical Field

[0001] The present invention relates to the field of passive detection based on external radiation sources, and in particular to a method, device, equipment, medium and program product for correcting direct wave path errors in detecting external radiation sources. Background Art

[0002] Passive detection technology based on external radiation sources is to receive the direct wave signal of the non-cooperative external radiation source and the scattered echo signal of the target from the external radiation source. The receiving station performs cross-correlation processing on the direct wave signal and the target echo signal to detect the parameters such as the target dual-base time delay and Doppler frequency shift, and then use the direction finding results to realize passive positioning and tracking of the target. The principle diagram of passive detection positioning based on external radiation sources is shown in the figure below. Figure 1 As shown, the external radiation source detection and positioning system uses a time difference ellipse and a lateral line to intersect to obtain the target position information.

[0003] The direct wave of the passive detection system based on external radiation source used in the actual environment must be impure, that is, the direct wave must contain other multipath signals. Although the traditional external radiation source detection and positioning method still has good detection and positioning processing results when facing the direct wave containing multipath signals in the actual environment. However, when the external radiation source and the receiving station are not in line of sight, such as Figure 2 As shown, there is no real direct path signal in the direct wave. At this time, strong multipath signals play a major role, and traditional detection and positioning methods will face new problems. Summary of the invention

[0004] When a passive detection system based on an external radiation source is used to locate a target in actual use, the distance from the external radiation source to the direct receiving antenna used in the external radiation source positioning solution is inconsistent with the actual propagation path of the electromagnetic wave from the external radiation source to the direct receiving antenna, which leads to the problem of system positioning error. In particular, when the direct receiving antenna and the external radiation source are not in line of sight, the propagation path distance of the electromagnetic wave from the external radiation source to the direct receiving antenna is difficult to be directly calculated by the position of the external radiation source and the position of the direct receiving antenna, and the strong multipath signal that plays a major role is difficult to determine and is closely related to the environment. At this time, the positioning error of the external radiation source system will deteriorate sharply, and the system needs to correct the direct wave path error, so as to keep the system positioning accuracy index from deteriorating. In view of this, the present invention provides a method, device, equipment, medium and program product for correcting the direct wave path error of external radiation source detection to improve the target positioning accuracy of the external radiation source detection system in actual use.

[0005] The present invention provides a method for correcting a direct wave path error in detecting an external radiation source, comprising:

[0006] S1, constructing the relationship between the target with known position information and the target with unknown position information based on the time difference measurement result;

[0007] S2, by detecting the known position information target and utilizing the relationship between the known position information target and the unknown position information target, the unknown position information target is located.

[0008] In some embodiments, the relationship between the known location information target and the unknown location information target is:

[0009] r 11 +r 12 =r 21 +r 22 -cτ 2 +cτ 3

[0010] Among them, r 11 is the distance from the external radiation source to the target with unknown position information, r 12 is the distance from the known location information target to the receiving station, r 21 is the distance from the external radiation source to the target with known position information, r 22 is the distance from the known location information target to the receiving station, c is the speed of light, τ 2 is the time difference of the target with known position information, τ 3 The time difference of the target with unknown location information.

[0011] In some embodiments, step S2 includes:

[0012] By detecting the target with known position information, the distance r from the external radiation source to the target with known position information is calculated. 21 And the distance r from the target to the receiving station with known location information 22 ; Joint time difference τ for targets with known position information 2 Measurement and time difference τ of unknown position information target 3 Measurement, using the relationship between the known position information target and the unknown position information target, calculate r 11 +r 12 ;

[0013] According to the calculation results, the unknown position information target is located at the receiving station and the external radiation source as the focus, and the distance is r 11 +r 12 The unknown position information target is located on the time difference ellipse, and then the direction finding line is crossed with the time difference ellipse to locate the target.

[0014] The present invention also provides a device for correcting the path error of a direct wave detected by an external radiation source, comprising:

[0015] A first processing module, used for constructing a relationship between a target with known position information and a target with unknown position information according to a time difference measurement result;

[0016] The second processing module is used to detect the known position information target and use the relationship between the known position information target and the unknown position information target to locate the unknown position information target.

[0017] The present invention also provides an electronic device, comprising:

[0018] at least one processor; and a memory communicatively coupled to the at least one processor;

[0019] The memory stores instructions that can be executed by the at least one processor, and the at least one processor executes the above method by executing the instructions stored in the memory.

[0020] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store instructions, and when the instructions are executed, the above method is implemented.

[0021] The present invention also provides a computer program product, which, when called by a computer, enables the computer to execute the above method.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] The present invention completes the correction of direct wave path error based on prior information, solves the problem of large positioning error of external radiation source detection using non-line-of-sight external radiation sources, and makes the performance of passive detection systems based on external radiation sources more stable and the target positioning accuracy higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the positioning principle of the traditional method.

[0025] Figure 2 Schematic diagram of the scenario where there is no line of sight between the external radiation source and the receiving station.

[0026] Figure 3 Schematic diagram of the principle of a method for correcting direct wave path errors in detecting an external radiation source in an embodiment of the present invention.

[0027] Figure 4 Positioning result map for traditional methods.

[0028] Figure 5 This is a diagram showing the positioning results of the direct wave path error correction method for detecting an external radiation source in an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of the structure of an electronic pen in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] For each beat of data, the external radiation source detection and positioning processing uses a time difference ellipse and a direction finding line to intersect to obtain the target position information. Under ideal conditions, Figure 1 As shown, the time difference measurement results are as follows:

[0033] r1+r2-L=cτ (1)

[0034] Among them, τ is the time difference measured by the passive positioning system based on the external radiation source, cτ is the measured distance difference, c is the speed of light; r1 is the distance from the external radiation source to the target, r2 is the distance from the target to the receiving station, and L is the distance from the external radiation source to the receiving station, that is, the direct wave transmission distance. At this time, the target is located with the receiving station and the external radiation source transmitting station as the focus, and the distance sum of the time difference ellipse is:

[0035] r1+r2=cτ+L (2)

[0036] The target is then located by intersecting the direction-finding line with the time difference ellipse.

[0037] When the external radiation source and the receiving station are not in line of sight, the strong multipath transmission path is typically L1+L2. Figure 2 As shown, the time difference measurement results are as follows:

[0038] r1+r2-(L1+L2)=cτ 1 (3)

[0039] τ 1 is the time difference measured by the passive positioning system based on external radiation source, cτ 1 This is the measured distance difference. According to the traditional method, the distance sum of the time difference ellipse is:

[0040] r1+r2=cτ 1 +L (4)

[0041] Due to the lack of line of sight between the external radiation source and the receiving station, the time difference output τ measured by the system 1 It is no longer the ideal output τ, so the accuracy of external radiation source detection and positioning is greatly deteriorated.

[0042] In view of this, this embodiment provides a method for correcting a direct wave path error in detecting an external radiation source, comprising:

[0043] S1, constructing the relationship between the target with known position information and the target with unknown position information based on the time difference measurement result;

[0044] S2, by detecting the known position information target and utilizing the relationship between the known position information target and the unknown position information target, the unknown position information target is located.

[0045] like Figure 3 As shown in the figure, under the condition that the external radiation source and the receiving station are not in line of sight, for each beat of data, the transmission path of the strong multipath in the direct wave is a certain path. For different targets of the same beat data, this transmission path is the same. By using the detection of targets with known position information, such as the detection of civil aviation targets with publicly known position information, the time difference measurement results are as follows:

[0046] r 21 +r 22 -(L1+L2)=cτ 2 (5)

[0047] At this time, for the unknown position information target of the same beat data, the time difference measurement results are as follows:

[0048] r 11 +r 12 -(L1+L2)=cτ 3 (6)

[0049] Combining equation (5) and equation (6), we can get:

[0050] r 11 +r 12 =r 21 +r 22 -cτ 2 +cτ 3 (7)

[0051] From the above formula, we can know that by detecting the target with known position information, we can calculate the distance r from the external radiation source to the target with known position information: 21 , the distance r from the known location information target to the receiving station can be calculated 22 , combined with the time difference τ of the target with known position information 2 Measurement and time difference τ of unknown position information target 3 Measurement, r can be calculated11 +r 12 It can be seen that the unknown position information target is located at the receiving station and the external radiation source transmitting station as the focus, and the distance is r 11 +r 12 The target with unknown position information is located on the time difference ellipse of the direction finding line, and then the direction finding line intersects with the time difference ellipse to locate the target. At this time, by utilizing the prior information of the target detection with known position information, the error of the direct wave path of the external radiation source detection has been corrected by the algorithm. In special cases such as the lack of line of sight between the external radiation source and the receiving station, the detection and positioning of the external radiation source can still be completed.

[0052] from Figure 4 From the positioning results of the traditional method, it can be seen that under the ideal condition without direct wave path error, the time difference measurement ellipse is shown as the black ellipse. Combined with the crossing of the direction finding line, the positioning result under ideal conditions is (-314.9km 307.4km); due to the lack of line of sight between the external radiation source and the receiving station, the time difference measurement ellipse without correcting the direct wave path error by the traditional method is shown as the green ellipse. Combined with the crossing of the direction finding line, the positioning result is (-251.0km 275.5km), and the positioning error reaches 71.42km.

[0053] from Figure 5 The improved positioning result shows that, after the method proposed by the present invention, the time difference measurement ellipse is shown as the red ellipse, and the positioning result combined with the direction finding cross is (-312.0km 306.0km), and the positioning error is 3.22km. Figure 4 , Figure 5 The method proposed in the present invention effectively corrects the direct wave path error under the condition that the external radiation source and the receiving station have no line of sight. The positioning accuracy of the method of the present invention is significantly improved compared with the traditional method.

[0054] Based on the same inventive concept, this embodiment also provides a device for correcting a direct wave path error in detecting an external radiation source, comprising:

[0055] A first processing module, used for constructing a relationship between a target with known position information and a target with unknown position information according to a time difference measurement result;

[0056] The second processing module is used to detect the known position information target and use the relationship between the known position information target and the unknown position information target to locate the unknown position information target.

[0057] The specific processing of each of the above functional units can refer to the description of the method in the above embodiment, which will not be repeated here.

[0058] Based on the same technical concept, the embodiment of the present application also provides an electronic device, which can implement the method flow of the error correction method for detecting direct waves from external radiation sources provided in the above embodiment of the present application. In one embodiment, the electronic device can be a server, or a terminal device or other electronic device. Figure 6 As shown, the electronic device may include:

[0059] At least one processor, and a memory connected to the at least one processor. The specific connection medium between the processor and the memory is not limited in the embodiment of the present application. Figure 6 The example in this article is that the processor and memory are connected through a bus. Figure 6 The connections between other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into address bus, data bus, control bus, etc. Figure 6 In the diagram, only one thick line is used, but this does not mean that there is only one bus or only one type of bus. Alternatively, a processor can also be called a controller, and there is no limitation on the name.

[0060] In an embodiment of the present application, the memory stores instructions that can be executed by at least one processor, and the at least one processor can execute the above-mentioned method for correcting the path error of a direct wave detected by an external radiation source by executing the instructions stored in the memory. The processor can implement Figure 6 The functions of each module in the device shown.

[0061] Among them, the processor is the control center of the device, which can use various interfaces and lines to connect the various parts of the entire control device, and monitor the device as a whole by running or executing instructions stored in the memory and calling data stored in the memory, various functions of the device and processing data.

[0062] In an optional design, the processor may include one or more processing units, and the processor may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the modem processor may not be integrated into the processor. In some embodiments, the processor and the memory may be implemented on the same chip, and in some embodiments, they may also be implemented separately on separate chips.

[0063] The processor may be a general-purpose processor, such as a CPU, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of a method for correcting a direct wave path error in detecting an external radiation source disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0064] As a non-volatile computer-readable storage medium, the memory can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The memory can include at least one type of storage medium, for example, it can include flash memory, hard disk, multimedia card, card-type memory, random access memory (Random Access s Memory, RAM), static random access memory (Static Random Access Memory, SRAM), programmable read-only memory (Programmable Read Only Memory, PROM), read-only memory (Read Only Memory, ROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), magnetic storage, disk, optical disk, etc. The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application can also be a circuit or any other device that can realize a storage function, for storing program instructions and / or data.

[0065] By designing and programming the processor, the code corresponding to the method for correcting the path error of a direct wave detected by an external radiation source introduced in the above embodiment can be fixed into the chip, so that the chip can perform the steps of the method for correcting the path error of a direct wave detected by an external radiation source in the above embodiment when running. How to design and program the processor is a technology well known to those skilled in the art and will not be described in detail here.

[0066] Based on the same inventive concept, an embodiment of the present application also provides a storage medium, which stores computer instructions. When the computer instructions are executed on a computer, the computer executes a method for correcting the direct wave path error of an external radiation source detection discussed above.

[0067] In some optional embodiments, the present application also provides various aspects of a method for correcting the path error of a direct wave detected by an external radiation source, which can also be implemented in the form of a program product, which includes a program code. When the program product is run on an apparatus, the program code is used to enable the control device to execute the steps of a method for correcting the path error of a direct wave detected by an external radiation source according to various exemplary embodiments of the present application described above in this specification.

[0068] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of a unit described above can be further divided into multiple units to be embodied. In addition, although the operation of the method of the present application is described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step for execution, and / or one step can be decomposed into multiple steps for execution.

[0069] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0070] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a server, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] Program code for performing the operations of the present application may be written using any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0072] Where a remote computing device is involved, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for correcting direct wave path errors in detecting external radiation sources, characterized in that: include: S1, constructing the relationship between the target with known position information and the target with unknown position information based on the time difference measurement result; S2, by detecting the known position information target and utilizing the relationship between the known position information target and the unknown position information target, the unknown position information target is located.

2. The method for correcting direct wave path errors in external radiation source detection according to claim 1, characterized in that: The relationship between the known location information target and the unknown location information target is: r 11 +r 12 =r 21 +r 22 -cτ 2 +cτ 3 Among them, r 11 is the distance from the external radiation source to the target with unknown position information, r 12 is the distance from the known location information target to the receiving station, r 21 is the distance from the external radiation source to the target with known position information, r 22 is the distance from the known location information target to the receiving station, c is the speed of light, τ 2 is the time difference of the target with known position information, τ 3 The time difference of the target with unknown location information.

3. The method for correcting direct wave path errors in external radiation source detection according to claim 2, characterized in that: Step S2 includes: By detecting the target with known position information, the distance r from the external radiation source to the target with known position information is calculated. 21 And the distance r from the target to the receiving station with known location information 22 ; Joint time difference τ for targets with known position information 2 Measurement and time difference τ of unknown position information target 3 Measurement, using the relationship between the known position information target and the unknown position information target, calculate r 11 +r 12 ; According to the calculation results, the unknown position information target is located at the receiving station and the external radiation source as the focus, and the distance is r 11 +r 12 The unknown position information target is located on the time difference ellipse, and then the direction finding line is crossed with the time difference ellipse to locate the target.

4. A device for correcting direct wave path errors in detecting external radiation sources, characterized in that: include: A first processing module, used for constructing a relationship between a target with known position information and a target with unknown position information according to a time difference measurement result; The second processing module is used to detect the known position information target and use the relationship between the known position information target and the unknown position information target to locate the unknown position information target.

5. The device for correcting direct wave path errors in detecting external radiation sources according to claim 4, characterized in that: The relationship between the known location information target and the unknown location information target is: r 11 +r 12 =r 21 +r 22 -cτ 2 +cτ 3 Among them, r 11 is the distance from the external radiation source to the target with unknown position information, r 12 is the distance from the known location information target to the receiving station, r 21 is the distance from the external radiation source to the target with known position information, r 22 is the distance from the known location information target to the receiving station, c is the speed of light, τ 2 is the time difference of the target with known position information, τ 3 The time difference of the target with unknown location information.

6. The device for correcting direct wave path errors in detecting external radiation sources according to claim 5, characterized in that: The second processing module is specifically used for: By detecting the target with known position information, the distance r from the external radiation source to the target with known position information is calculated. 21 And the distance r from the target to the receiving station with known location information 22 ; Joint time difference τ for targets with known position information 2 Measurement and time difference τ of unknown position information target 3 Measurement, using the relationship between the known position information target and the unknown position information target, calculate r 11 +r 12 ; According to the calculation results, the unknown position information target is located at the receiving station and the external radiation source as the focus, and the distance is r 11 +r 12 The unknown position information target is located on the time difference ellipse, and then the direction finding line is crossed with the time difference ellipse to locate the target.

7. An electronic device, characterized in that: include: at least one processor; and a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the at least one processor executes the method as described in any one of claims 1 to 3 by executing the instructions stored in the memory.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store instructions, and when the instructions are executed, the method according to any one of claims 1 to 3 is implemented.

9. A computer program product, characterized in that When the computer program product is called by a computer, the computer executes the method according to any one of claims 1 to 3.

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