Active and passive information association method based on target motion direction and amplitude change rate
By using an information association method based on the target's motion direction and amplitude change rate, the problem of ambiguous information matching in joint detection by radar and electronic reconnaissance equipment is solved, and accurate target judgment and decision-making are achieved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- THE 724TH RESEARCH INSTITUTE OF CHINA STATE SHIPBUILDING CORP LTD
- Filing Date
- 2025-11-25
- Publication Date
- 2026-07-02
AI Technical Summary
When radar and electronic reconnaissance equipment are used for joint detection, if multiple radars detect target tracks within the beam range of the electronic reconnaissance equipment, the matching and correlation between the radar tracks and the electromagnetic spectrum information detected by the reconnaissance equipment are ambiguous, leading to inconvenience in target judgment and decision-making.
By extracting the target's motion direction from the radar track and the rate of change of signal amplitude detected by electronic reconnaissance equipment, the relationship between the track information and the reconnaissance equipment information is used to determine whether the two belong to the same target, thus eliminating data ambiguity and improving decision-making efficiency.
It achieves accurate matching and correlation of radar and electronic reconnaissance equipment information, eliminates data ambiguity, and improves the efficiency of target determination.
Smart Images
Figure CN2025137366_02072026_PF_FP_ABST
Abstract
Description
A method for associating active and passive information based on the direction and rate of change of target motion. Technical Field
[0001] This invention belongs to the field of joint detection technology of radar and electronic reconnaissance equipment, specifically a method for associating active and passive information based on the target's motion direction and amplitude change rate. Background Technology
[0002] Radar and electronic reconnaissance equipment are widely used in the field of information perception. They each have their own characteristics. Radar is used to acquire target motion parameters and Doppler information, while electronic reconnaissance equipment is used to acquire the target's electromagnetic spectrum information. The joint detection of radar and electronic reconnaissance can give full play to the advantages of the two types of sensors and improve the ability to detect and track targets.
[0003] The azimuth accuracy of radar is generally 0.3° (root mean square), while that of electronic reconnaissance equipment is generally 4°-5° (root mean square). Therefore, when there are multiple radars detecting target tracks within the beam range of electronic reconnaissance equipment, it is difficult to match and correlate the radar tracks with the electromagnetic spectrum information detected by reconnaissance, which brings inconvenience to the next step of target judgment and decision-making. Summary of the Invention
[0004] To address the above problems, this invention proposes a method for associating active and passive information based on the target's motion direction and amplitude change rate.
[0005] The technical solution to achieve the purpose of this invention is: a method for associating active and passive information based on the target motion direction and amplitude change rate, comprising:
[0006] Step 1: Receive radar message information and radiation source parameter message information in real time;
[0007] Step 2: Read radar track data according to the set period and extract target position parameter information;
[0008] Step 3: Extract the target's position parameters from the radiation source parameter data obtained from the electronic reconnaissance equipment, and divide the detection area into regions centered on the target's position parameters and with the electronic reconnaissance equipment's accuracy set as the boundary. Mark these regions as Region 1, and extract the radar track data falling within Region 1.
[0009] Step 4: Extract relative heading and relative speed information from the radar track data falling within area 1 one by one, and determine the radial velocity of the target relative to the detection radar based on the relative heading and relative speed information;
[0010] Step 5: Extract the rate of change of amplitude from the radiation source parameter data;
[0011] Step 6: Correlate the radar track with the radiation source information based on the target's radial velocity relative to the detection radar and the rate of change of signal amplitude. The azimuth and elevation parameter values in the correlated data are based on the azimuth and elevation values in the radar track parameters.
[0012] Step 7: Determine whether the radial velocity of the target relative to the detection radar and the rate of change of the signal amplitude meet the set conditions. If they do, determine the correspondence between the radiation source parameters and the radar track to form the associated target parameters. Otherwise, remove the association and return to step 2 to re-associate.
[0013] Step 8: Output the associated parameters.
[0014] Preferably, the radar message information includes: range, azimuth, elevation angle, relative speed, and relative heading information.
[0015] Preferably, the radiation source parameter message information includes: azimuth, elevation angle, relative speed, relative heading, signal amplitude change rate, frequency, and bandwidth information.
[0016] Preferably, the target location parameter information extracted in step 2 includes distance, azimuth, and elevation angle.
[0017] Preferably, the period for reading radar track data in step 2 is set to 200ms.
[0018] Preferably, step 3 uses three times the accuracy of electronic reconnaissance equipment as the boundary.
[0019] Preferably, the specific formula for determining the radial velocity of the target relative to the detection radar based on the relative heading and relative speed information is: V Rα (n)=|V R (n)|×cos(θ T )
[0020] In the formula, V Rα (n) represents the radial velocity of the target relative to the detection radar, V R (n) represents the relative speed, θ T This refers to the relative heading.
[0021] Preferably, the specific rules for associating radar tracks with radiation source information based on the target's radial velocity relative to the detection radar and the rate of change of signal amplitude are as follows:
[0022] V Rα (n)>ε v The corresponding trajectory and ΔA(m)>ε A Associate the corresponding radiation source information;
[0023] V Rα (n)<-ε vThe corresponding trajectory and ΔA(m) <-ε A Associate the corresponding radiation source information;
[0024] |V Rα (n)|≤ε v The corresponding trajectory and |ΔA(m)|≤ε A The corresponding radiation source information is correlated, where V Rα (n) represents the radial velocity of the target relative to the detection radar, ε v ε is the radial velocity threshold. A ΔA(m) is the amplitude change rate threshold, and ΔA(m) is the signal amplitude change rate.
[0025] Preferably, the determination method in step 7 is as follows:
[0026] Determine whether the radial velocity of the target relative to the detection radar and the sign of the rate of change of the signal amplitude have not changed within the set period. If they have not changed, determine the correspondence between the radiation source parameters and the radar track to form the associated target parameters. Otherwise, remove the association and return to step 2 to re-associate.
[0027] Compared with existing technologies, the significant advantages of this invention are as follows: In the case of joint radar and electronic reconnaissance detection, where multiple radar-detected target tracks exist within the beam range of the electronic reconnaissance equipment, there is an ambiguity in the matching and correlation of radar tracks and electromagnetic spectrum information detected by reconnaissance. This invention proposes an algorithm that uses target motion information extracted from track information and signal amplitude change rate information from the information detected by the reconnaissance equipment for correlation. The algorithm extracts the relationship between the target motion direction in the radar track and the signal amplitude change rate in the electronic reconnaissance equipment, determines the correlation between the two, confirms parameters belonging to the same target, and then correlates the detection and perception information of the two sensors on the same equipment, eliminating data ambiguity and improving decision efficiency. Attached Figure Description
[0028] Figure 1 is a flowchart of a method for associating active and passive information based on the target motion direction and amplitude change rate.
[0029] Figure 2 shows the distribution of radar target tracks.
[0030] Figure 3 is a schematic diagram of radar detection targets within the radiation range of the electronic reconnaissance beam.
[0031] Figure 4 is a schematic diagram of matching targets that form an association. Detailed Implementation
[0032] The invention will be further explained below with reference to the accompanying drawings.
[0033] A method for associating active and passive information based on the target motion direction and amplitude change rate is proposed. Within the shared detection area of radar and electronic reconnaissance, the target motion direction is extracted from the radar-detected track information and decomposed into radial and tangential directions relative to the reconnaissance equipment. From the information detected by the electronic reconnaissance equipment, the received signal amplitude is extracted and the signal amplitude change rate is analyzed. The relationship between the target motion direction in the radar track and the signal amplitude change rate in the electronic reconnaissance equipment is correlated; targets with the same amplitude change rate are identified as the same target. Information belonging to the same target is correlated to determine target parameters, laying the foundation for subsequent measures against UAVs. As shown in Figure 1, the specific steps of the method are as follows:
[0034] S1: Receive radar message information and radiation source parameter message information in real time. The radar message information includes at least the following parameters: range, azimuth, elevation angle, relative speed, and relative heading. The radiation source parameter message information includes at least the following parameters: azimuth, elevation angle, relative speed, relative heading, signal amplitude change rate, frequency, and bandwidth.
[0035] S2: Read radar track data according to the set period and extract target position parameters: range, azimuth, and elevation. In this step, radar track data is read from radar message information according to the set period to extract target position parameters.
[0036] In some embodiments, the set period is 200ms.
[0037] S3: Extract the target's position parameters from the radiation source parameter data obtained from the electronic reconnaissance equipment, including azimuth and elevation parameters. Draw a detection area centered on the azimuth and elevation parameters of the radiation source, with a boundary of 3 times the accuracy of the electronic reconnaissance equipment, and mark it as area 1. Extract the radar track data falling within area 1.
[0038] In this step, the radiation source parameter data is the radiation source parameter message information.
[0039] S4: Extract relative heading and relative speed information from the radar track data falling in area 1 one by one, and determine the radial velocity of the target within area 1 relative to the detection radar based on the relative heading and relative speed information.
[0040] Specifically, in the radar track data of region 1, relative heading and relative information are extracted one by one from the radar track data. Based on the relative heading and relative speed information, the radial velocity V of the target relative to the detection radar is extracted. Rα (n), where n is the number of tracks falling within the region Φ(i), and the relative speed is denoted as V. R (n), with the relative heading denoted as θ T .
[0041] The radial velocity of the target relative to the detection radar is specifically: V Rα (n)=|V R (n)|×cos(θ T )
[0042] In practical applications, the radial velocity can be used to determine the target's displacement or flight status, for example:
[0043] When |V Rα (n)|≤ε v When the target is determined to have no displacement in the radial direction;
[0044] When |V Rα (n)|>ε v When this occurs, it is determined that the target has displacement in the radial direction;
[0045] When V Rα (n)>ε v At that time, determine that the target is flying towards the station;
[0046] When V Rα (n)<-ε v At that time, it was determined that the target was flying behind the station.
[0047] Where, ε v =0.3m / s;
[0048] S5: Radiation source parameter data within the Φ(i) region, extracting the signal amplitude change rate ΔA(m) from the radiation source parameter data, where m is the number of radiation source parameters falling within the Φ(i) region;
[0049] S6: Correlate the radar track with radiation source information based on the target's radial velocity relative to the detection radar and the rate of change of signal amplitude.
[0050] V Rα (n)>ε v The corresponding trajectory and ΔA(m)>ε A Associate the corresponding radiation source information;
[0051] V Rα (n)<-ε v The corresponding trajectory and ΔA(m) < -ε A Associate the corresponding radiation source information;
[0052] |V Rα (n)|≤ε v The corresponding trajectory and |ΔA(m)|≤ε A Associate the corresponding radiation source information;
[0053] Where, ε A =0.5mV / s;
[0054] S7: Based on the antenna period, V Rα If the signs of the two correlation parameters Δn and ΔA(m) remain unchanged for three consecutive cycles, the correspondence between the radiation source parameters and the radar track is determined, forming the correlated target parameters, including: range, azimuth, elevation angle, relative speed, relative heading, and frequency. Otherwise, the correlation is terminated and re-correlated.
[0055] S8: Output related parameters.
[0056] During the continuous reception of radar message information and radiation source parameter message information, steps S2 to S8 are executed in the set periodic sequence.
[0057] Example
[0058] In this embodiment, the collected radar target tracks are shown in Table 1, and the corresponding distribution map is shown in Figure 2.
[0059] Table 1
[0060] The data collected from electronic reconnaissance is shown in Table 2:
[0061] Table 2
[0062] The accuracy of electronic reconnaissance is 3° in azimuth and 3° in elevation. Now we need radar detection data and electronic reconnaissance data.
[0063] Area 1 is the area bounded by the azimuth range (23.5, 41.5) and the elevation range (1.3, 19.3);
[0064] The radar target tracks falling within the area 1 are shown in Table 3. A detailed schematic diagram is shown in Figure 3. The red circles (i.e., the small circles in the figure) represent the target track azimuth and distance distribution points, and the blue circles (i.e., the circles indicated by the arrows in the figure, which are teardrop-shaped circles) represent the matching areas.
[0065] Table 3
[0066] Radial velocity calculation:
[0067] According to V Rα (n)=|V R (n)|×cos(θ T )
[0068] Calculate the radial velocity of the target falling within region 1, as shown in Table 4.
[0069] Table 4
[0070] VRα The track corresponding to (n) > εv and ΔA(m) > ε A Associate the corresponding radiation source information;
[0071] The target amplitude change rate obtained by electronic reconnaissance is 1.2 mv / s. According to the matching method in step 6, the second track can be matched with this data. The results after association are shown in Table 5.
[0072] Table 5
[0073] The target results after association are shown in Figure 4. The red circles (i.e., the small circles in the figure) are the target track bearing and distance distribution points, the blue circles represent the matching area (i.e., the closed circle in the figure that looks like a water droplet), and the red circles marked with blue asterisks (i.e., the small circles in the figure with * inside) are the target tracks matched by radar reconnaissance.
Claims
1. A method for associating active and passive information based on the target's motion direction and amplitude change rate, characterized in that, include: Step 1: Receive radar message information and radiation source parameter message information in real time; Step 2: Read radar track data according to the set period and extract target position parameter information; Step 3: Extract the target's position parameters from the radiation source parameter data obtained from the electronic reconnaissance equipment, and divide the detection area into regions centered on the target's position parameters and with the electronic reconnaissance equipment's accuracy set as the boundary. Mark these regions as Region 1, and extract the radar track data falling within Region 1. Step 4: Extract relative heading and relative speed information from the radar track data falling within area 1 one by one, and determine the radial velocity of the target relative to the detection radar based on the relative heading and relative speed information; Step 5: Extract the rate of change of amplitude from the radiation source parameter data; Step 6: Correlate the radar track with the radiation source information based on the target's radial velocity relative to the detection radar and the rate of change of signal amplitude. The azimuth and elevation parameter values in the correlated data are based on the azimuth and elevation values in the radar track parameters. Step 7: Determine whether the radial velocity of the target relative to the detection radar and the rate of change of the signal amplitude meet the set conditions. If they do, determine the correspondence between the radiation source parameters and the radar track to form the associated target parameters. Otherwise, remove the association and return to step 2 to re-associate. Step 8: Output the associated data.
2. The active and passive information association method based on the target motion direction and amplitude change rate as described in claim 1, characterized in that, The radar message information includes: range, azimuth, elevation angle, relative speed, and relative heading information.
3. The active and passive information association method based on the target motion direction and amplitude change rate as described in claim 1, characterized in that, The radiation source parameter message information includes: azimuth, elevation angle, signal amplitude change rate, frequency, and bandwidth information.
4. The active and passive information association method based on the target motion direction and amplitude change rate as described in claim 1, characterized in that, The target location parameters extracted in step 2 include distance, azimuth, and elevation.
5. The active and passive information association method based on the target motion direction and amplitude change rate according to claim 1, characterized in that, In step 2, the period for reading radar track data is set to 200ms.
6. The active and passive information association method based on the target motion direction and amplitude change rate according to claim 1, characterized in that, In step 3, the accuracy is set at 3 times that of electronic reconnaissance equipment.
7. The active and passive information association method based on the target motion direction and amplitude change rate as described in claim 1, characterized in that, The specific formula for determining the radial velocity of a target relative to the detection radar based on relative heading and relative speed information is: V Rα (n)=|V R (n)|×cos(θ T ), In the formula, V Rα (n) represents the radial velocity of the target relative to the detection radar, V R (n) represents the relative speed, θ T This refers to the relative heading.
8. The active and passive information association method based on the target motion direction and amplitude change rate according to claim 1, characterized in that, The specific rules for associating radar tracks with radiation source information based on the target's radial velocity relative to the detection radar and the rate of change of signal amplitude are as follows: V Rα (n)>ε v The corresponding trajectory and ΔA(m)>ε A Associate the corresponding radiation source information; V Rα (n)<-ε v The corresponding trajectory and ΔA(m) < -ε A Associate the corresponding radiation source information; |V Rα (n)|≤ε v The corresponding trajectory and |ΔA(m)|<-ε A The corresponding radiation source information is correlated, where V Rα (n) represents the radial velocity of the target relative to the detection radar, ε v ε is the radial velocity threshold. A ΔA(m) is the amplitude change rate threshold, and ΔA(m) is the signal amplitude change rate.
9. The active and passive information association method based on the target motion direction and amplitude change rate according to claim 1, characterized in that, The specific method for determining this in step 7 is as follows: Determine whether the radial velocity of the target relative to the detection radar and the sign of the rate of change of the signal amplitude have not changed within the set period. If they have not changed, determine the correspondence between the radiation source parameters and the radar track to form the associated target parameters. Otherwise, remove the association and return to step 2 to re-associate.