Method for measuring drop point deviation

Abstract

The invention discloses a drop point deviation measurement method, which comprises the following steps of: firstly, determining coordinates of a theoretical drop point of a projectile body by using a differential GPS (Global Positioning System), and setting a total station standing position on the side of the theoretical drop point; using a total station to measure the included angle and the distance between the north direction and the connecting line of the theoretical drop point, three point positions, which are away from the theoretical drop point by a preset distance in the projectile body shooting direction and the vertical shooting direction, and the station position of the total station, wherein the included angle and the distance are formed by the theoretical drop point, the projectile body shooting direction and the vertical shooting direction; a total station is erected at the same point after a flight test, the actual positions of the three points on the ground are found out according to the included angle and the distance measured before the test, and a steel tape is used for measuring the drop point deviation, the longitudinal deviation and the transverse deviation. According to the invention, the shooting direction and the vertical shooting direction can be accurately identified, so that a steel tape can be conveniently used for intuitively measuring the longitudinal deviation and the transverse deviation, the measurement error is small, and the test precision is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of conventional weapon equipment performance testing, and mainly to a method for measuring a drop point deviation. Background Art

[0002] The landing point deviation is an important indicator of long-range precision-guided ammunition. The accuracy of the result directly affects the test results of the missile flight, and is related to the development progress and even success of the equipment.

[0003] At present, the point of impact deviation is mostly measured by GPS positioning, that is, before the flight test, the theoretical point coordinates are measured at the required distance using the satellite station differential GPS as the target point for the long-range missile strike. After the flight test, the actual point of impact coordinates are measured, specifically the coordinates of the deepest point in the crater are measured, and the point of impact deviation is calculated by comparing with the theoretical point of impact coordinates before the test. Since the target path of long-range missiles and arrows is mostly located in uninhabited areas, and the impact points are mostly located in areas without base stations such as deserts and Gobi hinterlands, single-station positioning is used. The actual precision measurement accuracy can reach about 30cm for horizontal position and about 50cm for vertical position, which can meet the requirements for most tests.

[0004] For long-range projectiles and arrows, the landing point deviation index is within 10m or even within 5m. When conducting such ammunition comparison tests or finalization tests, the landing point deviation measurement accuracy is expected to be less than 10cm, and it is generally required to use a steel tape measure for measurement. However, due to the large size of long-range projectiles and arrows, the diameter of the crater after landing is often greater than 10m, and the theoretical landing point red flag or other signs of such projectiles and arrows are destroyed, making it difficult to determine the exact position of the theoretical landing point, and the error is large when using a steel tape measure for measurement. At the same time, the landing point deviation often needs to be decomposed into the longitudinal deviation along the shooting direction and the lateral deviation perpendicular to the shooting direction. When using a steel tape measure to measure the landing point deviation, it is impossible to accurately find the shooting direction and the vertical shooting direction. Summary of the invention

[0005] The purpose of the present invention is to provide a method for measuring the drop point deviation, which can accurately determine the theoretical drop point position of a projectile, solve the problem of rapid and accurate evaluation of the projectile flight test results, and improve the test efficiency.

[0006] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0007] A method for measuring a drop point deviation, comprising:

[0008] Step 1: Before the flight test of the missile, the coordinates of the theoretical landing point of the missile and the coordinates of the total station are measured using the satellite station differential GPS and converted into plane coordinates;

[0009] Step 2, set up the total station at the total station position, use a benchmark to mark the local north direction; determine the direction of the projectile on the plane, use the total station to measure the angle and distance between the three points A, B at the first preset distance from the theoretical landing point, and C at the first preset distance from the theoretical landing point and the total station position, and mark them on the plane. After the measurement is completed, withdraw the total station;

[0010] Step 3, after the flight test of the missile body is completed, the total station is re-installed on the total station station, and after marking the local north direction, the actual positions A1, B1, and C1 of the three points A, B, and C on the ground are found according to the angles and distances of the three points marked on the plane before the flight test, namely, the theoretical landing point A of the missile body, the point B of the missile body upwardly at the first preset distance from the theoretical landing point of the missile body, and the point C of the missile body vertically at the first preset distance from the theoretical landing point of the missile body;

[0011] Step 4, according to the actual positions A1, B1, C1 of the three points found on the ground, mark the two directions of the projectile shooting direction and the vertical shooting direction, and then directly measure the distance S between the actual landing point of the projectile and the theoretical landing point of the projectile, measure the longitudinal deviation L of the actual landing point of the projectile along the determined projectile shooting direction and the theoretical landing point of the projectile and the lateral deviation H on the determined vertical shooting direction, and use a total station to measure the angle θ and the distance L4 of the line connecting the actual landing point of the projectile and the total station position relative to the north direction;

[0012] Step 5, converting the coordinates of the actual landing point of the projectile into plane coordinates according to the angle θ and the distance L4, and calculating the distance S1 between the actual landing point of the projectile and the theoretical landing point of the projectile, the longitudinal deviation L1 of the actual landing point of the projectile in the projectile shooting direction and the lateral deviation H1 of the actual landing point of the projectile in the vertical shooting direction and the theoretical landing point of the projectile on the plane according to the plane coordinates of the theoretical landing point of the projectile in the plane, the plane coordinates of the actual landing point of the projectile and the shooting direction of the projectile in the plane;

[0013] Use S1 and S, L and L1, H1 and H to compare respectively to check whether the measurement is correct; when the differences between S1 and S, L and L1, H1 and H are all within the corresponding preset ranges, the deviation measurement is considered correct.

[0014] Furthermore, the plane coordinates of the total station are set to (0,0).

[0015] Furthermore, the first preset distance is 10-30 m.

[0016] Furthermore, the total station is arranged at 100m to the side of the theoretical landing point of the projectile.

[0017] Furthermore, the point B is a point on the plane located behind the theoretical landing point and shooting upward; the point C is a point on the plane located above the theoretical landing point and shooting vertically upward.

[0018] A terminal measurement device comprises a processor, a memory and a computer program stored in the memory; when the processor executes the computer program, the landing point deviation measurement method is implemented.

[0019] A computer-readable storage medium stores a computer program; when the computer program is executed by a processor, the landing point deviation measurement method is implemented.

[0020] Compared with the prior art, the present invention has the following technical features:

[0021] The invention can accurately mark the projection direction and the vertical projection direction, so that it is convenient to use a steel tape measure to intuitively measure the longitudinal deviation and the lateral deviation, and the measurement error is small, which greatly improves the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the principle of the present invention. DETAILED DESCRIPTION

[0023] See attached Figure 1 The present invention provides a method for measuring a drop point deviation, comprising:

[0024] Step 1: Before the flight test of the missile, the coordinates of the theoretical landing point of the missile and the coordinates of the total station are measured by using the satellite differential GPS and converted into plane coordinates. The plane coordinates of the theoretical landing point of the missile are marked as (X1, Y1), and the plane coordinates of the total station are marked as (X2, Y2); for the convenience of calculation, (X2, Y2) can be set to (0, 0). In the embodiment of the present invention, the total station is arranged at 100m to the side of the theoretical landing point of the missile.

[0025] Step 2, set up the total station on the total station position, and use a benchmark to mark the local north direction; determine the direction of the projectile on the plane, and use the total station to measure the angles and distances between the lines connecting the three points, namely, the theoretical landing point A of the projectile, point B 20m away from the theoretical landing point in the upward direction (longitudinal direction of the projectile), and point C 20m away from the theoretical landing point in the vertical direction (lateral direction of the projectile) and the total station position relative to the north direction, and mark them on the plane. After completing the measurement, withdraw the total station; wherein, point B is a point on the plane located in the upward direction of the projectile behind the theoretical landing point; point C is a point on the plane located vertically above the theoretical landing point.

[0026] exist Figure 1 In the example, the angle and distance between the theoretical impact point of the projectile and the total station position relative to the north direction are recorded as γ and L3 respectively; the angle and distance between the line connecting the point 20m away from the theoretical impact point of the projectile in the upward direction and the total station position relative to the north direction are recorded as α and L1 respectively; the angle and distance between the line connecting the point 20m away from the theoretical impact point of the projectile in the vertical direction and the total station position relative to the north direction are recorded as β and L2 respectively.

[0027] Step 3, after the flight test of the projectile is completed, the total station is re-installed on the total station position, and after marking the local north direction, the actual positions A1, B1, and C1 of the three points on the ground, namely, the theoretical landing point A of the projectile on the plane, the point B 20m away from the theoretical landing point of the projectile upward, and the point C 20m away from the theoretical landing point of the projectile in the vertical direction, are found according to the angles and distances of the points A, B, and C marked on the plane before the flight test; since the relationship between the coordinates projected onto the plane in step 1 is known, the exact positions of the three points can be quickly found even if the three points are destroyed by craters.

[0028] Step 4, according to the actual positions A1, B1, C1 of the three points found on the ground, mark the two directions of the projectile shooting direction and the vertical shooting direction, and then use a steel tape measure to directly measure the distance S between the actual landing point of the projectile and the theoretical landing point of the projectile, measure the longitudinal deviation L of the actual landing point of the projectile along the determined projectile shooting direction and the theoretical landing point of the projectile and the lateral deviation H in the determined vertical shooting direction, and use a total station to measure the angle θ and distance L4 of the line connecting the actual landing point of the projectile and the total station position relative to the north direction.

[0029] Step 5, according to the angle θ and the distance L4, the coordinates of the actual landing point of the projectile are converted into plane coordinates marked as (X3, Y3), and according to the plane coordinates (X1, Y1) of the theoretical landing point of the projectile in the plane, the plane coordinates (X3, Y3) of the actual landing point of the projectile and the shooting direction of the projectile in the plane, the distance S1 between the actual landing point of the projectile and the theoretical landing point of the projectile, the longitudinal deviation L1 of the actual landing point of the projectile in the shooting direction of the projectile and the theoretical landing point of the projectile, and the lateral deviation H1 between the vertical shooting direction and the theoretical landing point of the projectile are calculated on the plane;

[0030] Use S1 and S, L and L1, H1 and H to compare and check whether the measurement is correct; when the differences between S1 and S, L and L1, H1 and H are all within the corresponding preset ranges, the deviation measurement is considered correct; otherwise, it is considered incorrect and should be remeasured.

[0031] Because this method only uses satellite differential GPS to measure the coordinates of four points in almost the same time period before the flight test, the system error is small. The angle measurement accuracy of the total station is 1′ and the distance measurement accuracy is 1mm. Therefore, the landing point deviation accuracy measured by this method can be guaranteed to be within 2cm, greatly improving the test accuracy.

[0032] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for measuring a drop point deviation, characterized in that: include: Step 1: Before the flight test of the missile, the coordinates of the theoretical landing point of the missile and the coordinates of the total station are measured using the satellite station differential GPS and converted into plane coordinates; Step 2, set up the total station at the total station position, use a benchmark to mark the local north direction; determine the direction of the projectile on the plane, use the total station to measure the angle and distance between the three points A, B at the first preset distance from the theoretical landing point, and C at the first preset distance from the theoretical landing point and the total station position, and mark them on the plane. After the measurement is completed, withdraw the total station; Step 3, after the flight test of the missile body is completed, the total station is re-installed on the total station station, and after marking the local north direction, the actual positions A1, B1, and C1 of the three points A, B, and C on the ground are found according to the angles and distances of the three points marked on the plane before the flight test, namely, the theoretical landing point A of the missile body, the point B of the missile body upwardly at the first preset distance from the theoretical landing point of the missile body, and the point C of the missile body vertically at the first preset distance from the theoretical landing point of the missile body; Step 4, according to the actual positions A1, B1, C1 of the three points found on the ground, mark the two directions of the projectile shooting direction and the vertical shooting direction, and then directly measure the distance S between the actual landing point of the projectile and the theoretical landing point of the projectile, measure the longitudinal deviation L of the actual landing point of the projectile along the determined projectile shooting direction and the theoretical landing point of the projectile and the lateral deviation H on the determined vertical shooting direction, and use a total station to measure the angle θ and the distance L4 of the line connecting the actual landing point of the projectile and the total station position relative to the north direction; Step 5, converting the coordinates of the actual landing point of the projectile into plane coordinates according to the angle θ and the distance L4, and calculating the distance S1 between the actual landing point of the projectile and the theoretical landing point of the projectile, the longitudinal deviation L1 of the actual landing point of the projectile in the projectile shooting direction and the lateral deviation H1 of the actual landing point of the projectile in the vertical shooting direction and the theoretical landing point of the projectile on the plane according to the plane coordinates of the theoretical landing point of the projectile in the plane, the plane coordinates of the actual landing point of the projectile and the shooting direction of the projectile in the plane; Use S1 and S, L and L1, H1 and H to compare respectively to check whether the measurement is correct; when the differences between S1 and S, L and L1, H1 and H are all within the corresponding preset ranges, the deviation measurement is considered correct.

2. The method for measuring the landing point deviation according to claim 1, characterized in that: The plane coordinates of the total station are set to (0,0).

3. The method for measuring the landing point deviation according to claim 1, characterized in that: The first preset distance is 10-30m.

4. The method for measuring the landing point deviation according to claim 1, characterized in that: The total station is arranged at 100m to the side of the theoretical landing point of the projectile.

5. The method for measuring the landing point deviation according to claim 1, characterized in that: The point B is a point on the plane that is located behind the theoretical landing point and the projectile is projected upward; the point C is a point on the plane that is located above the theoretical landing point and vertically projected upward.

6. A terminal measurement device, comprising a processor, a memory and a computer program stored in the memory; characterized in that: When the processor executes the computer program, it implements the landing point deviation measurement method according to any one of claims 1-5.

7. A computer-readable storage medium, wherein a computer program is stored in the medium; when the computer program is executed by a processor, the landing point deviation measurement method according to any one of claims 1 to 5 is implemented.

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