A method for quickly determining threat target sets for space reconnaissance

Abstract

The present invention relates to a method for quickly determining a space reconnaissance threat target set, comprising: obtaining preset information of a current ground mission; based on the electromagnetic radiation characteristics of ground targets, electromagnetic silent protection, working frequency band, the relationship between the power density of ground target radiation and the sensitivity of electronic reconnaissance satellite receivers, resolution, and mission period, screening from satellite database reconnaissance to obtain a final screening result. The present invention determines a sensitive reconnaissance satellite target set (i.e., the final screening result) based on the intelligence information of the reconnaissance satellite combined with the ground mission information, solves the problems of calculation timeliness and calculation accuracy, and can accurately and effectively screen out reconnaissance satellites that pose a reconnaissance threat to the current ground action mission.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace reconnaissance and relates to a method for quickly determining a threat target set of aerospace reconnaissance. Background Art

[0002] Imaging reconnaissance satellites are mainly used to identify the deployment, situation and target characteristics of ground targets, providing a basis for command decisions. Imaging reconnaissance satellites are mainly divided into optical imaging and radar imaging, which detect and identify ground targets through high-resolution visible light photography and synthetic aperture side-looking radar imaging.

[0003] Electronic reconnaissance satellites are mainly used to detect the characteristic parameters and positions of various enemy radars, and to detect and eavesdrop on the signal parameters and information intelligence of enemy satellite communications, scatter communications, and ultra-short wave communications. The electronic reconnaissance satellite payload is mainly composed of radar signal receivers and radio signal receivers. The radar signal receiver ultimately outputs the position and performance parameters of the radar; the radio signal receiver outputs the position and size information of the enemy's forces, etc.

[0004] In aerospace reconnaissance calculations, the first thing to do is to determine the reconnaissance satellite target set. Currently, there are two main strategies: Strategy 1 is to manually input all known reconnaissance satellite target sets, and Strategy 2 is to manually input the key reconnaissance satellite target sets that are currently known. Using Strategy 1 will cause the entire solution calculation time to be too long and the safety period to be too short. It is very likely that there will be no safety period, which is a conservative strategy; the problem with using Strategy 2 is whether the key target set is complete and relevant to the actual task. When calculating for certain tasks, sensitive reconnaissance satellites may be omitted, which is a risky strategy.

[0005] Therefore, how to accurately and effectively determine the sensitive reconnaissance satellite target set has become an urgent problem to be solved. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a method for quickly determining a space reconnaissance threat target set. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] An embodiment of the present invention provides a method for quickly determining a space reconnaissance threat target set, and the method for quickly determining a space reconnaissance threat target set includes:

[0008] Step 1: Obtain preset information of the current ground mission, wherein the preset information includes mission period and target characteristic size;

[0009] Step 2: According to the needs of the current ground mission, based on the electromagnetic radiation characteristics of the ground target, electromagnetic silence protection, working frequency band, the relationship between the power density of the ground target radiation and the sensitivity of the electronic reconnaissance satellite receiver, resolution, and mission period, the final screening result is obtained from the reconnaissance satellite database, where the reconnaissance satellite database is a pre-established database including multiple reconnaissance satellite data.

[0010] In one embodiment of the present invention, the preset information also includes the electromagnetic radiation operating frequency band, peak power, antenna gain of the ground radiation source target, and whether electromagnetic silence protection measures are taken.

[0011] In one embodiment of the present invention, the calculation formula of the target characteristic size is:

[0012]

[0013] Among them, l is the target feature size, R is the diameter of the circular target, length is the length of the rectangular target, width is the width of the rectangular target, and A is the outer contour area of ​​the irregular target.

[0014] In one embodiment of the present invention, the reconnaissance satellite database includes satellite numbers, optimal resolutions of imaging reconnaissance satellites, and reconnaissance frequency bands of electronic reconnaissance satellites.

[0015] In one embodiment of the present invention, the reconnaissance satellite database also includes satellite names, receiver sensitivity, and perigee heights of the reconnaissance satellites.

[0016] In one embodiment of the present invention, step 2 comprises:

[0017] Step 2.1, judging whether the ground target has electromagnetic radiation characteristics, if it has electromagnetic radiation characteristics, jumping to step 2.2, if it does not have electromagnetic radiation characteristics, jumping to step 2.5;

[0018] Step 2.2, determining whether the ground target has been subjected to electromagnetic silence protection. If so, filtering out all electronic reconnaissance satellites in the reconnaissance satellite database to generate a first target set, and directly jumping to step 2.5; if not, jumping to step 2.3;

[0019] Step 2.3, determining whether the receiving frequency band ranges of all electronic reconnaissance satellites in the reconnaissance satellite database overlap with the working frequency band of the ground radiation source signal; if there is no overlap for a certain satellite, filtering out the electronic reconnaissance satellites that do not overlap in the reconnaissance satellite database; if there is an overlap for a certain satellite, retaining the electronic reconnaissance satellites that overlap in the reconnaissance satellite database to generate a second target set, and jumping to step 2.4;

[0020] Step 2.4: Determine the power density S radiated by the ground target dB and the sensitivity of the electronic reconnaissance satellite receiver P r If S dB >P r , then retain the electronic reconnaissance satellite in the second target set. If S dB <P r , then filter out the electronic reconnaissance satellite in the second target set to obtain a third target set;

[0021] Step 2.5, filtering out all reconnaissance satellites that do not meet the ground target resolution requirement in the first target set or the third target set to obtain a fourth target set;

[0022] Step 2.6, determine whether the mission period is the night of the local time. If so, filter out all visible light imaging satellites in the fourth target set to obtain the final screening result. If not, the fourth target set is the final screening result.

[0023] In one embodiment of the present invention, the judgment criteria for the ground target resolution requirement are:

[0024]

[0025] Among them, D is the optimal resolution of the reconnaissance satellite, and l is the target feature size.

[0026] In one embodiment of the present invention, the calculation formula of the power density is:

[0027] S dB =(P t +G-4π-R 2 ) dB =10logP t +G-10log(4π)-10log R 2

[0028] Among them, P t is the transmission power of the transmitter equipped with the ground radiation source, G is the antenna gain, and R is the perigee height of the electronic reconnaissance satellite.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The present invention combines the intelligence information of the reconnaissance satellite with the ground mission information, and according to the actual needs of the mission, comprehensively considers the electromagnetic radiation characteristics, electromagnetic silent protection, working frequency band, the relationship between the power density of ground target radiation and the sensitivity of the electronic reconnaissance satellite receiver, resolution, mission period and other factors, and finally determines the sensitive reconnaissance satellite target set (i.e., the final screening result), solves the problems of calculation timeliness and calculation accuracy, and can accurately and effectively screen out reconnaissance satellites that pose a reconnaissance threat to the current ground action mission.

[0031] (2) In order to solve the problem that the payload parameters of non-cooperative reconnaissance satellites are difficult to obtain, the present invention uses the main technical parameters of the reconnaissance satellite, such as the resolution of the imaging reconnaissance satellite and the reconnaissance frequency band of the electronic reconnaissance satellite, to reduce the difficulty of operation.

[0032] (3) The present invention solves the problems of long calculation time and too few safe periods caused by using the full target set in space reconnaissance, as well as the security risk problem of missing sensitive reconnaissance satellites when using a partial key target set.

[0033] Other aspects and features of the present invention will become apparent from the following detailed description with reference to the accompanying drawings. It should be understood, however, that the drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention, as reference should be made to the appended claims. It should also be understood that, unless otherwise indicated, the drawings are not necessarily drawn to scale and are intended merely to conceptually illustrate the structures and processes described herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a flow chart of a method for rapidly determining a space reconnaissance threat target set provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of an electromagnetic wave frequency band provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0037] Embodiment 1

[0038] In order to solve the problem that it is difficult to determine the effective reconnaissance satellite target set in aerospace reconnaissance, the present invention determines the sensitive reconnaissance satellite target set (i.e. the final screening result) based on the intelligence information of the reconnaissance satellite combined with the ground mission information and the actual needs of the mission, and solves the problems of calculation timeliness and calculation accuracy. Figure 1 and Figure 2 , Figure 1A schematic diagram of a flow chart of a method for rapidly determining a space reconnaissance threat target set provided by an embodiment of the present invention, Figure 2 A flowchart of another method for quickly determining a space reconnaissance threat target set provided by an embodiment of the present invention is provided. The present invention provides a method for quickly determining a space reconnaissance threat target set. The method for quickly determining a space reconnaissance threat target set includes steps 1 to 3, wherein:

[0039] Step 1: Obtain preset information of the current ground mission, the preset information includes the mission period and target characteristic size, the target is a ground target, for example, the target is radar equipment, communication equipment, etc.

[0040] Specifically, the calculation formula of the target feature size is:

[0041]

[0042] Among them, l is the target feature size, R is the diameter of the circular target, length is the length of the rectangular target, width is the width of the rectangular target, and A is the outer contour area of ​​the irregular target.

[0043] Furthermore, the preset information also includes the electromagnetic radiation operating frequency band, peak power, antenna gain of the ground radiation source target and whether electromagnetic silent protection measures are taken.

[0044] In addition, it is necessary to pre-establish a reconnaissance satellite database, which is a pre-established database including multiple reconnaissance satellite data. The reconnaissance satellite database includes satellite numbers, optimal resolutions of imaging reconnaissance satellites, reconnaissance frequency bands of electronic reconnaissance satellites, satellite names, receiver sensitivity, and perigee heights of reconnaissance satellites. It should be noted that the information in the reconnaissance satellite database is obtained through open source intelligence, that is, information obtained from public network information resources and publicly available comprehensive application big data resources.

[0045] Step 2: According to the needs of the current ground mission, based on the electromagnetic radiation characteristics of ground targets, electromagnetic silent protection, operating frequency band, the relationship between the power density of ground target radiation and the sensitivity of electronic reconnaissance satellite receivers, resolution, and mission period, the final screening results are obtained from the reconnaissance satellite database.

[0046] In a specific embodiment, step 2 may specifically include steps 2.1 to 2.6, wherein:

[0047] Step 2.1: Determine whether the ground target has electromagnetic radiation characteristics. If it does, jump to step 2.2; if it does not, jump to step 2.5.

[0048] Among them, the method for judging the electromagnetic radiation characteristics is based on whether the ground target radiates electromagnetic waves outward. If it radiates, it has electromagnetic radiation characteristics; if it does not radiate, it does not have electromagnetic radiation characteristics. For example, radar and communication equipment are devices with electromagnetic radiation characteristics.

[0049] Step 2.2: Determine whether the ground target has been subjected to electromagnetic silence protection. If so, filter out all electronic reconnaissance satellites in the reconnaissance satellite database to generate the first target set and directly jump to step 2.5. If not, jump to step 2.3.

[0050] Among them, electromagnetic silence protection completely shuts down electromagnetic radiation, and the ground target no longer has electromagnetic radiation characteristics.

[0051] Step 2.3, determine whether there is an intersection between the receiving frequency band range of all electronic reconnaissance satellites in the reconnaissance satellite database (i.e., the reconnaissance frequency band range) and the working frequency band of the ground radiation source signal. If there is no intersection for a certain satellite, filter out the electronic reconnaissance satellites that do not have an intersection in the reconnaissance satellite database. If there is an intersection for a certain satellite, retain the electronic reconnaissance satellites that have an intersection in the reconnaissance satellite database to generate a second target set, and jump to step 2.4;

[0052] Step 2.4: Determine the power density S radiated by the ground target dB and the sensitivity of the electronic reconnaissance satellite receiver P r If S dB >P r , then keep the electronic reconnaissance satellite in the second target set. If S dB <P r , then filter out the electronic reconnaissance satellite in the second target set to obtain the third target set. That is:

[0053] S dB >P r :Retain the electronic reconnaissance satellite

[0054] S dB <P r :Filter the electronic reconnaissance satellite

[0055] Among them, P r is the sensitivity of the electronic reconnaissance satellite receiver, S dB is the power density radiated by the ground target. If there are multiple radiation source targets on the ground, the maximum radiation power density among the multiple targets is taken as the basis for judgment.

[0056] In this embodiment, the power density S of the ground radiation source target transmitter reaching the space electronic reconnaissance satellite receiver is dB The calculation formula is:

[0057] S dB =(P t +G-4π-R 2 ) dB =10logP t +G-10log(4π)-10logR 2

[0058] Where P t is the transmitting power of the transmitter equipped with the ground radiation source, in W, G is the antenna gain, in dB, and R is the perigee height of the electronic reconnaissance satellite, in m.

[0059] Step 2.5: Filter out all reconnaissance satellites in the first target set or the third target set that do not meet the ground target resolution requirements to obtain the fourth target set. That is, filter out all reconnaissance satellites in the first target set or the third target set that do not meet the target discovery requirements according to the following formula:

[0060]

[0061] Among them, D is the optimal resolution of the reconnaissance satellite, and l is the target feature size.

[0062] That is to say, it is determined whether the optimal resolution of the reconnaissance satellite in the first target set or the third target set is less than or equal to the target characteristic size. If so, the reconnaissance satellite is retained; if not, the reconnaissance satellite is filtered out.

[0063] Step 2.6, determine whether the mission period is the night of local time. If so, filter out all visible light imaging satellites in the fourth target set to generate the fifth target set, the calculation is completed, and the fifth target set is used as the final screening result. If not (that is, it is daytime or includes the daytime period), the fourth target set is the final screening result, and the final screening result is the reconnaissance satellite that poses a reconnaissance threat to the mission.

[0064] Preferably, night is from 22:00 to 6:00 the next day at local time, and the rest of the time is daytime.

[0065] By utilizing the method for determining a sensitive reconnaissance satellite target set for space reconnaissance satellites of the present invention, reconnaissance satellites that pose a reconnaissance threat to the current ground action mission can be accurately and effectively screened out.

[0066] In view of the problem that the payload parameters of non-cooperative reconnaissance satellites are difficult to obtain, the present invention uses the main technical parameters of the reconnaissance satellite, such as the resolution of the imaging reconnaissance satellite and the reconnaissance frequency band of the electronic reconnaissance satellite, to reduce the difficulty of operation.

[0067] The present invention solves the problems of long calculation time and too few safety periods caused by using the full target set in aerospace reconnaissance, and the safety risk problem of missing sensitive reconnaissance satellites when using part of the key target set.

[0068] Embodiment 2

[0069] The present invention relates to a method for quickly determining a space reconnaissance threat target set. The present invention mainly comprises the following steps: first, reconnaissance satellite intelligence information and mission information are input; second, the target set is screened based on the imaging reconnaissance satellite resolution, the electronic reconnaissance satellite reconnaissance frequency band and the ground target characteristics, and finally the effective target set is determined.

[0070] Based on the first embodiment, the embodiment of the present invention further provides a method for determining a sensitive reconnaissance satellite target set, and the specific implementation steps are as follows:

[0071] S1: Input reconnaissance satellite intelligence information and relevant information of this mission.

[0072] S11, establish a reconnaissance satellite database, input eight types of information including satellite name of the reconnaissance satellite, satellite number, optimal resolution of the imaging reconnaissance satellite, reconnaissance frequency band of the electronic reconnaissance satellite, receiver sensitivity and perigee height of the reconnaissance satellite, as shown in Table 1.

[0073] Table 1 Satellite intelligence information

[0074]

[0075]

[0076] S12: Input the information related to this mission, including mission period, target characteristic size, electromagnetic radiation operating frequency band of ground radiation source target, peak power, antenna gain and whether electromagnetic silent protection measures are taken. For example, the information of a ground mission is as follows:

[0077] The mission period is from 8:00 on January 18, 2021 to 16:00 on January 18, 2021. The ground target is a radar equipment. The radar equipment is 10m long and 2.5m wide. The radar operating frequency band is L band, the peak power is 100KW, the antenna gain is -25dB, and electromagnetic silent protection is not implemented. The transit time of the reconnaissance satellite is calculated. The mission-related information input is shown in Table 2:

[0078] Table 2 Ground mission information

[0079]

[0080] The target in the task is a rectangular target, so based on the calculation formula of the target characteristic size, the target characteristic size is calculated as:

[0081]

[0082] S2: Based on step S1, screen out threatening reconnaissance satellites.

[0083] S21: Determine whether the ground target has electromagnetic radiation characteristics. In this mission, it does, so jump to the next step.

[0084] S22: Electromagnetic silent screening. The ground targets in this mission will not be subject to electromagnetic silent protection, so jump to the next step.

[0085] S23: Electromagnetic frequency band screening. The ground radiation source frequency band of this mission is L band. Figure 2 , it is determined that the frequency band of the radiation source is 1G-2G. After comparing it with the reconnaissance frequency band of the electronic reconnaissance satellite in the reconnaissance satellite database, it is found that there is no overlap with the frequency band of satellite 9. The target is filtered out and the second target set is generated as [001, 002, 003, 004, 006, 007].

[0086] S24: Signal strength screening. The peak power of this mission is 100KW, and the antenna gain is -25dB. The power density of the signal transmitted by the ground radiation source target transmitter and reaching the space electronic reconnaissance satellite receiver is calculated according to the following formula:

[0087] S=P t G / 4πR 2

[0088] Convert the above equation to dB form:

[0089] S dB =(P t +G-4π-R 2 ) dB =10logP t +G-10log(4π)-10logR 2

[0090] Therefore, based on the above formula, the power density of the ground radiation source signal arriving at the electronic reconnaissance satellite 006 is calculated as:

[0091] S dB =10log(100000)+(-25)-10log(4π)-10log(200000 2 )=-92

[0092] Because -92<-70, the 006 satellite is filtered out.

[0093] The power density of the ground radiation source signal arriving at the electronic reconnaissance satellite 007 is further calculated as:

[0094] S dB =10log(100000)+(-25)-10log(4π)-10log(250000 2 )=-94

[0095] Because -94>-100, the satellite is retained.

[0096] Therefore, the third target set is generated as [001, 002, 003, 004, 007].

[0097] S25: Resolution screening: The optimal resolution of imaging reconnaissance satellites 001, 002, 003, and 004 is determined by the following formula to determine the relationship between the optimal resolution and the characteristic size of the ground target:

[0098]

[0099] The optimal resolution of satellite 001 is 0.1m, 0.1*4=0.4<5, so satellite 001 is retained.

[0100] The optimal resolution of satellite 002 is 0.5m, 0.5*4=2<5, so satellite 002 is retained.

[0101] The optimal resolution of satellite 003 is 2m, 2*4=8>5, so this satellite is filtered out.

[0102] The optimal resolution of satellite 004 is 5m, 5*4=20>5, so this satellite is filtered out.

[0103] Therefore, the fourth target set is generated as [001, 002, 007].

[0104] S26: Task period screening. The task time is local time daytime, so the fourth target set is the final screening result.

[0105] That is, the effective reconnaissance satellite targets screened out are: Satellite 1, Satellite 2 and Satellite 7.

[0106] In the description of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristic data points described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristic data points described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0108] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for quickly determining a space reconnaissance threat target set, characterized in that: The method for quickly determining a space reconnaissance threat target set comprises: Step 1: Obtain preset information of the current ground mission, wherein the preset information includes mission period and target characteristic size; Step 2: According to the needs of the current ground mission, based on the electromagnetic radiation characteristics of the ground target, electromagnetic silence protection, working frequency band, the relationship between the power density of the ground target radiation and the sensitivity of the electronic reconnaissance satellite receiver, resolution, and mission period, the final screening result is screened from the reconnaissance satellite database, where the reconnaissance satellite database is a pre-established database including multiple reconnaissance satellite data; The step 2 comprises: Step 2.1, judging whether the ground target has electromagnetic radiation characteristics, if it has electromagnetic radiation characteristics, jumping to step 2.2, if it does not have electromagnetic radiation characteristics, jumping to step 2.5; Step 2.2, determining whether the ground target has been subjected to electromagnetic silence protection. If so, filtering out all electronic reconnaissance satellites in the reconnaissance satellite database to generate a first target set, and directly jumping to step 2.5; if not, jumping to step 2.3; Step 2.3, determining whether the receiving frequency band ranges of all electronic reconnaissance satellites in the reconnaissance satellite database overlap with the working frequency band of the ground radiation source signal; if there is no overlap for a certain satellite, filtering out the electronic reconnaissance satellites that do not overlap in the reconnaissance satellite database; if there is an overlap for a certain satellite, retaining the electronic reconnaissance satellites that overlap in the reconnaissance satellite database to generate a second target set, and jumping to step 2.4; Step 2.4: Determine the power density S radiated by the ground target dB and the sensitivity of the electronic reconnaissance satellite receiver P r If S dB >P r , then retain the electronic reconnaissance satellite in the second target set. If S dB <P r , then filter out the electronic reconnaissance satellite in the second target set to obtain a third target set; Step 2.5, filtering out all reconnaissance satellites that do not meet the ground target resolution requirement in the first target set or the third target set to obtain a fourth target set; Step 2.6, determine whether the mission period is the night of the local time. If so, filter out all visible light imaging satellites in the fourth target set to obtain the final screening result. If not, the fourth target set is the final screening result.

2. The method for rapidly determining a space reconnaissance threat target set according to claim 1, characterized in that: The preset information also includes the electromagnetic radiation operating frequency band, peak power, antenna gain of the ground radiation source target and whether electromagnetic silence protection measures are taken.

3. The method for rapidly determining a space reconnaissance threat target set according to claim 1, characterized in that: The calculation formula of the target characteristic size is: Among them, l is the target feature size, R is the diameter of the circular target, length is the length of the rectangular target, width is the width of the rectangular target, and A is the outer contour area of ​​the irregular target.

4. The method for rapidly determining a space reconnaissance threat target set according to claim 1, characterized in that: The reconnaissance satellite database includes satellite numbers, optimal resolutions of imaging reconnaissance satellites, and reconnaissance frequency bands of electronic reconnaissance satellites.

5. The method for rapidly determining a space reconnaissance threat target set according to claim 4, characterized in that: The reconnaissance satellite database also includes satellite names, receiver sensitivity, and perigee heights of the reconnaissance satellites.

6. The method for rapidly determining a space reconnaissance threat target set according to claim 1, characterized in that: The judgment criteria for the ground target resolution requirement are: Among them, D is the optimal resolution of the reconnaissance satellite, and l is the target feature size.

7. The method for rapidly determining a space reconnaissance threat target set according to claim 1, characterized in that: The calculation formula of the power density is: S dB =(P t +G-4π-R 2 ) dB =10logP t +G-10log(4π)-10logR 2 Among them, P t is the transmission power of the transmitter equipped with the ground radiation source, G is the antenna gain, and R is the perigee height of the electronic reconnaissance satellite.

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