A comprehensive recognition method and system for sea surface targets based on multiple information sources

Abstract

The present invention relates to a method and system for integrated surface target identification based on multiple information sources. The system determines the target type by sequentially determining whether the surface target has an associated AIS target, whether an SSR target is near the surface target, whether the surface target's electromagnetic signal is detected, and whether the surface target responds to an IFF query. The present invention utilizes a multi-information-source integrated approach to accurately determine the surface target type, improving radar operators' ability to identify surface targets.

Description

Technical Field

[0001] The present invention relates to the field of sea surface target recognition, and in particular to a sea surface target comprehensive recognition method and system based on multiple information sources. Background Art

[0002] High-resolution radars analyze the electromagnetic scattering characteristics of primary scattering sources, such as the ship's deck, side, and tower, to acquire a high-resolution range profile (HRRP) of the target. This profile reveals characteristics such as the target's size and structure along the radar's radial direction. However, HRRPs are difficult to acquire due to the ship's sway and imaging conditions, resulting in short imaging distances and a lack of data on the target's electromagnetic scattering characteristics.

[0003] SAR / ISAR (Synthetic Aperture Radar / Inverse Synthetic Aperture Radar) uses broadband signal transmission and synthetic aperture processing to obtain a two-dimensional (range and azimuth) structural feature map of a target. However, a lack of a target feature database makes manual identification difficult and limited in range.

[0004] Low-resolution narrowband radar can only detect the amplitude of radar echoes from surface targets, but not their electromagnetic scattering characteristics. The amplitude of radar echoes only reflects the target's RCS, but not its size or shape. Therefore, it can only classify ship targets as large, medium, or small, but still cannot identify the type of ship.

[0005] In summary, the existing methods of obtaining target information using radar all have the problem of low sea surface target recognition capability. Summary of the Invention

[0006] The purpose of the present invention is to provide a method and system for comprehensive recognition of sea surface targets based on multiple information sources, so as to improve the recognition ability of radar operators on sea surface targets.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A comprehensive sea surface target recognition method based on multiple information sources includes:

[0009] Acquire sea surface targets;

[0010] Determining whether the sea surface target has an associated AIS target to obtain a first determination result;

[0011] If the first judgment result is yes, searching the MMSI table according to the AIS target to determine the target type of the sea surface target;

[0012] If the first judgment result is no, determining whether there is an SSR target near the sea surface target to obtain a second judgment result;

[0013] If the second judgment result is yes, determining whether the SSR target lands on or flies around the sea surface target to obtain a third judgment result;

[0014] If the third judgment result is yes, the sea surface target is determined to be a sea surface military target, and the sea surface military target includes friendly sea surface military targets and non-friendly sea surface military targets;

[0015] If the second judgment result or the third judgment result is no, determining whether the electromagnetic signal of the sea surface target is detected to obtain a fourth judgment result;

[0016] If the fourth judgment result is yes, positioning the electromagnetic signal to obtain electromagnetic signal parameters, and determining the target type of the sea surface target according to the electromagnetic signal parameters;

[0017] If the fourth judgment result is no, determining whether the sea surface target responds to the IFF query to obtain a fifth judgment result;

[0018] If the fifth judgment result is yes, determining that the sea surface target is our sea surface military target;

[0019] If the fifth judgment result is no, the target type is determined according to the target activity pattern and movement elements.

[0020] Optionally, the target types include: friendly sea surface military targets, non-friendly sea surface military targets, moving sea civilian targets and fixed sea civilian targets.

[0021] Optionally, locating the electromagnetic signal to obtain electromagnetic signal parameters, and determining the target type of the sea surface target according to the electromagnetic signal parameters specifically includes:

[0022] Perform direction finding or positioning on the radar radiation signal detected by the electromagnetic signal receiving equipment to obtain electromagnetic signal parameters;

[0023] The radar model corresponding to the current parameters and the target type corresponding to the radar model are determined according to the electromagnetic signal parameters.

[0024] Optionally, determining the target type according to target activity patterns and motion elements specifically includes:

[0025] When the sea surface target is two or more ships traveling in formation, the current sea surface target is determined to be a non-friendly sea surface military target;

[0026] When the sea surface target is a single ship sailing at a speed less than 10 km / h, the current sea surface target is determined to be a civilian target moving at sea;

[0027] When the sea surface target is at a fixed position and has a speed of 0, the current sea surface target is determined to be a fixed civilian target at sea.

[0028] A comprehensive sea surface target recognition system based on multiple information sources includes:

[0029] Sea surface target acquisition module, used to acquire sea surface targets;

[0030] A first judgment module is used to judge whether the sea surface target has an associated AIS target and obtain a first judgment result;

[0031] a first target type determination module, configured to, when the first judgment result is yes, search the MMSI table according to the AIS target to determine the target type of the sea surface target;

[0032] A second judgment module is configured to, when the first judgment result is no, determine whether there is an SSR target near the sea surface target to obtain a second judgment result;

[0033] A third judgment module is configured to, when the second judgment result is yes, determine whether the SSR target has landed on or flown around the sea surface target, to obtain a third judgment result;

[0034] A sea surface military target determination module, configured to determine, when the third judgment result is yes, that the current sea surface target is a sea surface military target;

[0035] a fourth judgment module, configured to, when the second judgment result or the third judgment result is no, determine whether the electromagnetic signal of the sea surface target is detected, and obtain a fourth judgment result;

[0036] a second target type determination module, configured to, when the fourth judgment result is yes, locate the electromagnetic signal to obtain electromagnetic signal parameters, and determine the target type of the sea surface target according to the electromagnetic signal parameters;

[0037] a fifth judgment module, configured to, when the fourth judgment result is negative, judge whether the sea surface target responds to the IFF query, and obtain a fifth judgment result;

[0038] Our sea surface military target determination module, used for determining that the sea surface target is our sea surface military target when the fifth judgment result is yes;

[0039] The third target type determination module is used to determine the target type according to the target activity law and movement elements when the fifth judgment result is no.

[0040] Optionally, the target types include: friendly sea surface military targets, non-friendly sea surface military targets, moving sea civilian targets and fixed sea civilian targets.

[0041] Optionally, the second target type determination module specifically includes:

[0042] An electromagnetic signal parameter determination unit is used to perform direction finding or positioning on the radar radiation signal detected by the electromagnetic signal detection device to obtain electromagnetic signal parameters;

[0043] The target type determination unit is used to determine the radar model corresponding to the current parameters and the target type corresponding to the radar model according to the electromagnetic signal parameters.

[0044] Optionally, the third target type determination module specifically includes:

[0045] A non-friendly sea surface military target determination unit is used to determine that the current sea surface target is a non-friendly sea surface military target when the sea surface target is two or more ships traveling in formation;

[0046] A maritime moving civilian target determination unit is used to determine that the current sea surface target is a maritime moving civilian target when the sea surface target is a single ship sailing at a speed less than 10 km / h;

[0047] The maritime fixed civilian target determination unit is used to determine that the current sea surface target is a maritime fixed civilian target when the sea surface target is fixed in position and has a speed of 0.

[0048] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0049] The present invention provides a comprehensive sea surface target identification method based on multiple information sources. The target type is determined by sequentially judging whether there is an associated AIS target for the sea surface target, whether there is an SSR target near the sea surface target, whether the electromagnetic signal of the sea surface target is detected, and whether the sea surface target responds to an IFF query. The present invention uses a comprehensive method of multiple information sources to accurately determine the type of the sea surface target and improve the radar operator's ability to identify the sea surface target. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 This is a flow chart of the comprehensive sea surface target recognition method based on multiple information sources of the present invention;

[0052] Figure 2 Schematic diagram of radar radiation signal of the present invention;

[0053] Figure 3 The present invention uses an IFF query diagram;

[0054] Figure 4 This is a structural diagram of the sea surface target comprehensive identification system based on multiple information sources of the present invention. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0056] The purpose of the present invention is to provide a method and system for comprehensive recognition of sea surface targets based on multiple information sources, so as to improve the recognition ability of radar operators on sea surface targets.

[0057] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] As can be seen from the background technology, the existing technology has the following problems:

[0059] (1) Low-resolution narrow-band radar can only obtain the amplitude of the radar echo of the sea surface target and classify the sea surface targets into large, medium and small, but it is still unable to identify the type of target.

[0060] (2) Radar has a long detection range and a wide monitoring area, so radar operators need to process and identify a large number of sea targets. Currently, sea target identification relies entirely on the radar operator's own accumulated experience, which has low recognition efficiency and accuracy.

[0061] To address the above issues, AIS equipment can receive AIS information transmitted by surface vessels, which includes a unique identification code, the MMSI code. Each MMSI code is associated with information such as the vessel type, call sign, name, and nationality. Therefore, the target can be identified using the MMSI code. SSR (Secondary Radar) can obtain the identification code (also known as the 3A code) of an aerial target through active interrogation. Radar targets integrated with SSR information are aerial targets. Some large ships may carry carrier-based aircraft, which may take off to perform missions or training. Electromagnetic signal detection equipment can detect electromagnetic radiation signals from surface targets and locate or find the direction of the radar signal source. IFF (Identification Friend or Foe) equipment can transmit an interrogation signal to the target, and respond if it is a friendly target. The present invention provides a comprehensive sea surface target identification method based on multiple information sources. The target type is determined by sequentially judging whether there is an associated AIS target for the sea surface target, whether there is an SSR target near the sea surface target, whether the electromagnetic signal of the sea surface target is detected, and whether the sea surface target responds to an IFF query. The present invention uses a comprehensive method of multiple information sources to accurately determine the type of the sea surface target and improve the radar operator's ability to identify the sea surface target. Figure 1 This is a flow chart of the method for comprehensive recognition of sea surface targets based on multiple information sources of the present invention. Figure 1 As shown, a comprehensive sea surface target recognition method based on multiple information sources includes:

[0062] Step 101: Acquire sea surface targets.

[0063] Step 102: Determine whether the sea surface target has an associated AIS target, and obtain a first determination result.

[0064] Step 103: If the first judgment result is yes, the MMSI table is searched based on the AIS target to determine the target type of the surface target. The target types include: surface military targets and surface civilian targets. Specifically, surface military targets include friendly surface military targets and non-friendly surface military targets.

[0065] If the sea surface target has an AIS device turned on, the AIS device also receives the AIS information of the target and obtains the MMSI code. By searching the MMSI code database, the type, nationality, name, and other information of the radar target integrated with the AIS information are obtained. If the MMSI code of the target is not obtained or the MMSI code is not in the MMSI code database, or the target has not turned on its AIS device, step 104 is executed.

[0066] Step 104: If the first judgment result is no, determine whether there is an SSR target near the sea surface target to obtain a second judgment result.

[0067] Step 105: If the second judgment result is yes, determine whether the SSR target lands on or flies around the sea surface target to obtain a third judgment result.

[0068] Step 106: If the third judgment result is yes, determine that the sea surface target is a sea surface military target.

[0069] If there is an SSR target with a 3A code near a certain sea surface target, and the target is flown around or landed on, then the target is a sea surface military target with a carrier-based aircraft landing platform. If there is no SSA target with a 3A code near the target, then step 107 is executed.

[0070] Step 107: If the second judgment result or the third judgment result is no, determine whether the electromagnetic signal of the sea surface target is detected to obtain a fourth judgment result.

[0071] Step 108: If the fourth judgment result is yes, positioning the electromagnetic signal to obtain electromagnetic signal parameters, and determining the target type of the sea surface target based on the electromagnetic signal parameters, specifically including:

[0072] Step 1081: performing direction finding or positioning on the radar radiation signal detected by the electromagnetic signal receiving device to obtain electromagnetic signal parameters.

[0073] Step 1082: Determine the radar model corresponding to the current parameters and the target type corresponding to the radar model based on the electromagnetic signal parameters.

[0074] like Figure 2 As shown, the target 01 is near the radar radiation signal location point (dot) and is located on the direction finding line (M1). Therefore, the type of the target 01 is most likely the target type corresponding to the radar radiation signal. If no target radar radiation signal is detected, step 109 is executed.

[0075] Step 109: If the fourth judgment result is no, determine whether the sea surface target responds to the IFF query to obtain a fifth judgment result.

[0076] Step 110: If the fifth judgment result is yes, it is determined that the sea surface target is our sea surface military target.

[0077] Use IFF to conduct friend-or-foe identification query on the target. If the target responds, it is a friendly sea surface military target. If it does not respond, it is a non-friendly sea surface military target, a mobile sea civilian target, or a fixed sea civilian target. Figure 3As shown, IFF is used to query the targets 01, 02, and 03 in the S sea area multiple times. The targets 02 and 03 respond "ours", so the targets 02 and 03 are our sea surface military targets, while the targets 01 never respond. Therefore, the targets 01 are one of the sea surface targets selected from non-our sea surface military targets, mobile sea civilian targets, and fixed sea civilian targets. The target attributes cannot be determined, and step 111 is executed.

[0078] Step 111: If the fifth judgment result is negative, the target type is determined based on the target activity pattern and motion elements, specifically including:

[0079] When the sea surface target is two or more ships traveling in formation, the current sea surface target is determined to be a non-friendly sea surface military target;

[0080] When the sea surface target is a single ship sailing at a speed less than 10 km / h, the current sea surface target is determined to be a civilian target moving at sea, such as a fishing boat;

[0081] When the sea surface target is at a fixed position and has a speed of 0, it is determined that the current sea surface target is a fixed civilian target at sea, such as an offshore drilling platform.

[0082] Figure 4 This is a structural diagram of the sea surface target comprehensive identification system based on multiple information sources of the present invention. Figure 4 As shown, the present invention also provides a comprehensive sea surface target recognition system based on multiple information sources, the system comprising:

[0083] The sea surface target acquisition module 201 is used to acquire sea surface targets.

[0084] The first judgment module 202 is configured to judge whether the sea surface target has an associated AIS target, and obtain a first judgment result.

[0085] The first target type determination module 203 is configured to, when the first judgment result is yes, search the MMSI table based on the AIS target to determine the target type of the surface target. Target types include: surface military targets and surface civilian targets. Specifically, surface military targets include friendly surface military targets and non-friendly surface military targets.

[0086] The second judgment module 204 is configured to, when the first judgment result is no, determine whether there is an SSR target near the sea surface target to obtain a second judgment result.

[0087] The third judgment module 205 is used to judge whether the SSR target lands on or flies around the sea surface target when the second judgment result is yes, to obtain a third judgment result.

[0088] The sea surface military target determination module 206 is configured to determine that the current sea surface target is a sea surface military target when the third judgment result is yes.

[0089] The fourth judgment module 207 is configured to determine whether the electromagnetic signal of the sea surface target is detected when the second judgment result or the third judgment result is no, to obtain a fourth judgment result.

[0090] The second target type determination module 208 is configured to, when the fourth judgment result is yes, locate the electromagnetic signal to obtain electromagnetic signal parameters, and determine the target type of the sea surface target based on the electromagnetic signal parameters. The target types include: sea surface military targets and merchant ships.

[0091] The fifth judgment module 209 is configured to, when the fourth judgment result is negative, judge whether the sea surface target responds to the IFF query, and obtain a fifth judgment result.

[0092] The friendly sea surface military target determination module 210 is used to determine that the sea surface target is a friendly sea surface military target when the fifth judgment result is yes.

[0093] The third target type determination module 211 is configured to determine the target type according to target activity patterns and motion elements when the fifth judgment result is no.

[0094] The target type second determination module 208 specifically includes:

[0095] The electromagnetic signal parameter determination unit is used to perform direction finding or positioning on the radar radiation signal detected by the electromagnetic signal detection equipment to obtain the electromagnetic signal parameters.

[0096] The target type determination unit is used to determine the radar model corresponding to the current parameters and the target type corresponding to the radar model according to the electromagnetic signal parameters.

[0097] The target type third determination module 211 specifically includes:

[0098] The non-friendly sea surface military target determination unit is used to determine that the current sea surface target is a non-friendly sea surface military target when the sea surface target is two or more ships traveling in formation.

[0099] The maritime moving civilian target determination unit is used to determine that the current sea surface target is a maritime moving civilian target, such as a fishing boat, when the sea surface target is a single ship sailing at a speed less than 10km / h.

[0100] The maritime fixed civilian target determination unit is used to determine that the current sea surface target is a maritime fixed civilian target, such as an offshore drilling platform, when the sea surface target is fixed in position and has a speed of 0.

[0101] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0102] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A comprehensive sea surface target recognition method based on multiple information sources, characterized in that: include: Acquire sea surface targets; Determining whether the sea surface target has an associated AIS target to obtain a first determination result; If the first judgment result is yes, searching the MMSI table according to the AIS target to determine the target type of the sea surface target; If the first judgment result is no, determining whether there is an SSR target near the sea surface target to obtain a second judgment result; If the second judgment result is yes, determining whether the SSR target lands on or flies around the sea surface target to obtain a third judgment result; If the third judgment result is yes, determining that the sea surface target is a sea surface military target; If the second judgment result or the third judgment result is no, determining whether the electromagnetic signal of the sea surface target is detected to obtain a fourth judgment result; If the fourth judgment result is yes, positioning the electromagnetic signal to obtain electromagnetic signal parameters, and determining the target type of the sea surface target according to the electromagnetic signal parameters; If the fourth judgment result is no, determining whether the sea surface target responds to the IFF query to obtain a fifth judgment result; If the fifth judgment result is yes, determining that the sea surface target is our sea surface military target; If the fifth judgment result is no, the target type is determined according to the target activity pattern and movement elements.

2. The method for comprehensive recognition of sea surface targets based on multiple information sources according to claim 1, characterized in that: The target types include: our sea surface military targets, non-our sea surface military targets, moving civilian targets at sea and fixed civilian targets at sea.

3. The method for comprehensive recognition of sea surface targets based on multiple information sources according to claim 1, characterized in that: Positioning the electromagnetic signal to obtain electromagnetic signal parameters, and determining the target type of the sea surface target according to the electromagnetic signal parameters specifically includes: Perform direction finding or positioning on the radar radiation signal detected by the electromagnetic signal receiving equipment to obtain electromagnetic signal parameters; The radar model corresponding to the current parameters and the target type corresponding to the radar model are determined according to the electromagnetic signal parameters.

4. The method for comprehensive recognition of sea surface targets based on multiple information sources according to claim 1, characterized in that: Determining the target type based on the target activity pattern and motion elements specifically includes: When the sea surface target is two or more ships traveling in formation, the current sea surface target is determined to be a non-friendly sea surface military target; When the sea surface target is a single ship sailing at a speed less than 10 km / h, the current sea surface target is determined to be a civilian target moving at sea; When the sea surface target is at a fixed position and has a speed of 0, the current sea surface target is determined to be a fixed civilian target at sea.

5. A comprehensive sea surface target recognition system based on multiple information sources, characterized in that: include: Sea surface target acquisition module, used to acquire sea surface targets; A first judgment module is used to judge whether the sea surface target has an associated AIS target and obtain a first judgment result; a first target type determination module, configured to, when the first judgment result is yes, search the MMSI table according to the AIS target to determine the target type of the sea surface target; A second judgment module is configured to, when the first judgment result is no, determine whether there is an SSR target near the sea surface target to obtain a second judgment result; A third judgment module is configured to, when the second judgment result is yes, determine whether the SSR target has landed on or flown around the sea surface target, to obtain a third judgment result; A sea surface military target determination module, configured to determine, when the third judgment result is yes, that the current sea surface target is a sea surface military target; a fourth judgment module, configured to, when the second judgment result or the third judgment result is no, determine whether the electromagnetic signal of the sea surface target is detected, and obtain a fourth judgment result; a second target type determination module, configured to, when the fourth judgment result is yes, locate the electromagnetic signal to obtain electromagnetic signal parameters, and determine the target type of the sea surface target according to the electromagnetic signal parameters; a fifth judgment module, configured to, when the fourth judgment result is negative, judge whether the sea surface target responds to the IFF query, and obtain a fifth judgment result; Our sea surface military target determination module, used for determining that the sea surface target is our sea surface military target when the fifth judgment result is yes; The third target type determination module is used to determine the target type according to the target activity law and movement elements when the fifth judgment result is no.

6. The multi-information source-based integrated sea surface target recognition system according to claim 5, characterized in that: The target types include: our sea surface military targets, non-our sea surface military targets, moving civilian targets at sea and fixed civilian targets at sea.

7. The multi-information source-based integrated sea surface target recognition system according to claim 5, characterized in that: The second target type determination module specifically includes: An electromagnetic signal parameter determination unit is used to perform direction finding or positioning on the radar radiation signal detected by the electromagnetic signal detection device to obtain electromagnetic signal parameters; The target type determination unit is used to determine the radar model corresponding to the current parameters and the target type corresponding to the radar model according to the electromagnetic signal parameters.

8. The multi-information source-based integrated sea surface target recognition system according to claim 5, characterized in that: The target type third determination module specifically includes: A non-friendly sea surface military target determination unit is used to determine that the current sea surface target is a non-friendly sea surface military target when the sea surface target is two or more ships traveling in formation; A maritime moving civilian target determination unit is used to determine that the current sea surface target is a maritime moving civilian target when the sea surface target is a single ship sailing at a speed less than 10 km / h; The maritime fixed civilian target determination unit is used to determine that the current sea surface target is a maritime fixed civilian target when the sea surface target is fixed in position and has a speed of 0.

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