A method of measuring drop point deviation

Abstract

The application discloses a kind of fall point deviation measurement methods, first using differential GPS to determine the coordinate of projectile theory fall point, and setting total station position on the side of theory fall point;With the pole to show north, using total station to measure the angle between the connecting line of three point positions and north, distance, which are at preset distance from theory fall point, on projectile theory fall direction and vertical direction;After flight test, erect total station at the same point, find the actual position of three point positions on ground according to the angle and distance measured before test respectively, and measure fall point deviation, longitudinal deviation and lateral deviation using steel tape.The application can accurately identify the direction of direction and vertical direction, so as to facilitate intuitive measurement of longitudinal deviation and lateral deviation using steel tape, and the measurement error is small, which greatly improves the test precision.

Description

Technical Field

[0001] The present invention relates to the technical field of conventional weapon equipment performance testing, and mainly relates to a landing point deviation measurement method. 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 the success or failure of the equipment.

[0003] Currently, impact point deviation is often calculated using GPS positioning. Prior to flight testing, satellite-based differential GPS is used to measure the coordinates of a theoretical point at the required distance, serving as the target point for long-range projectiles and rockets. After the flight test, the actual impact point coordinates are measured, specifically the coordinates of the deepest point in the crater. These are then compared with the theoretical impact point coordinates before the test to calculate the impact point deviation. Because long-range projectile flight paths are often located in uninhabited areas, and impact points are often located in deserts and Gobi deserts without base stations, single-station positioning is used. This allows for actual measurement accuracy of approximately 30cm horizontally and 50cm vertically, which meets 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 comparison tests or finalization tests of such ammunition, when the landing point deviation measurement accuracy is expected to reach less than 10cm, 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. This causes the theoretical landing point red flag or other markings of such projectiles to be destroyed, making it difficult to determine the exact location of the theoretical landing point, and the error when using a steel tape measure for measurement is large. 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 landing point deviation, which can accurately determine the theoretical landing point position of a projectile, solve the problem of quickly and accurately evaluating the results of a projectile flight test, 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 landing 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 and use a pole to mark the local north direction; determine the projectile's direction on the plane, and use the total station to measure the angles and distances between the lines connecting the total station position and the north direction: the projectile's theoretical landing point A, point B at a first preset distance upward from the theoretical landing point, and point C at a first preset distance vertically from the theoretical landing point, 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. 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 marked on the plane before the flight test for the three points A, B, and C, which are the first preset distance from the theoretical impact point of the missile body in the upward direction, and the first preset distance from the theoretical impact point of the missile body in the vertical direction.

[0011] Step 4: Based on the actual positions A1, B1, and C1 of the three points found on the ground, identify the two directions of the projectile's launch direction and the vertical launch direction. Then, directly measure the distance S between the actual projectile landing point and the theoretical projectile landing point. Measure the longitudinal deviation L of the actual projectile landing point along the determined projectile's launch direction and the theoretical projectile landing point, and the lateral deviation H along the determined vertical launch direction. Simultaneously, use a total station to measure the angle θ and the distance L4 between the line connecting the actual projectile landing point and the total station's position relative to the north direction.

[0012] Step 5: Convert the actual landing point coordinates of the projectile into plane coordinates based on the included angle θ and the distance L4. Calculate the distance S1 between the actual landing point and the theoretical landing point, the longitudinal deviation L1 between the actual landing point and the theoretical landing point in the projectile's direction, and the lateral deviation H1 between the actual landing point and the theoretical landing point in the vertical direction based on the plane coordinates of the theoretical landing point, the plane coordinates of the actual landing point, and the projectile's direction in the plane.

[0013] 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.

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

[0015] Furthermore, the first preset distance is 10 to 30 meters.

[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 projected upward; and the point C is a point on the plane located vertically above the theoretical landing point and projected 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, thereby facilitating intuitive measurement of the longitudinal deviation and the lateral deviation using a steel tape measure, with a small measurement error, thereby greatly improving 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 landing point deviation, comprising:

[0024] Step 1: Before the flight test, use satellite differential GPS to measure the coordinates of the projectile's theoretical impact point and the coordinates of the total station's position and convert them into plane coordinates. The plane coordinates of the projectile's theoretical impact point are labeled (X1, Y1), and the plane coordinates of the total station's position are labeled (X2, Y2). For ease of calculation, (X2, Y2) can be set to (0, 0). In this embodiment of the present invention, the total station is placed 100 meters to the side of the projectile's theoretical impact point.

[0025] Step 2: Set up the total station at 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 the point on the plane located behind the theoretical landing point in the upward direction of the projectile; point C is the point on the plane located above the theoretical landing point in the vertical direction.

[0026] exist Figure 1 In the example, the angle and distance between the line connecting 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. After marking the local north direction, the actual positions A1, B1, and C1 of the three points on the ground are found according to the angles and distances of points A, B, and C marked on the plane before the flight test: the theoretical landing point A of the projectile, point B 20 meters away from the theoretical landing point of the projectile in the upward direction, and point C 20 meters away from the theoretical landing point of the projectile in the vertical direction. 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 the crater.

[0028] Step 4. According to the actual positions A1, B1, and C1 of the three points found on the ground, mark the two directions of the projectile's shooting direction and the vertical shooting direction. 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's shooting direction and the theoretical landing point of the projectile and the lateral deviation H in the determined vertical shooting direction. At the same time, 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.

[0029] Step 5: Convert the coordinates of the actual landing point of the projectile into plane coordinates (X3, Y3) based on the angle θ and the distance L4. Calculate the distance S1 between the actual landing point of the projectile and the theoretical landing point, the longitudinal deviation L1 between the actual landing point of the projectile and the theoretical landing point in the projectile's direction, and the lateral deviation H1 between the actual landing point of the projectile and the theoretical landing point in the vertical direction based on the plane coordinates (X1, Y1) of the theoretical landing point of the projectile, the plane coordinates (X3, Y3) of the actual landing point of the projectile, and the projectile's direction in 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 total station has an angle measurement accuracy of 1′ and a distance measurement accuracy of 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 various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for measuring landing 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 and use a pole to mark the local north direction; determine the projectile's direction on the plane, and use the total station to measure the angles and distances between the lines connecting the total station position and the north direction: the projectile's theoretical landing point A, point B at a first preset distance upward from the theoretical landing point, and point C at a first preset distance vertically from the theoretical landing point, 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. 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 marked on the plane before the flight test for the three points A, B, and C, which are the first preset distance from the theoretical impact point of the missile body in the upward direction, and the first preset distance from the theoretical impact point of the missile body in the vertical direction. Step 4: Based on the actual positions A1, B1, and C1 of the three points found on the ground, identify the two directions of the projectile's launch direction and the vertical launch direction. Then, directly measure the distance S between the actual projectile landing point and the theoretical projectile landing point. Measure the longitudinal deviation L of the actual projectile landing point along the determined projectile's launch direction and the theoretical projectile landing point, and the lateral deviation H along the determined vertical launch direction. Simultaneously, use a total station to measure the angle θ and the distance L4 between the line connecting the actual projectile landing point and the total station's position relative to the north direction. Step 5: Convert the actual landing point coordinates of the projectile into plane coordinates based on the included angle θ and the distance L4. Calculate the distance S1 between the actual landing point and the theoretical landing point, the longitudinal deviation L1 between the actual landing point and the theoretical landing point in the projectile's direction, and the lateral deviation H1 between the actual landing point and the theoretical landing point in the vertical direction based on the plane coordinates of the theoretical landing point, the plane coordinates of the actual landing point, and the projectile's direction in the plane. 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.

2. The method for measuring 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 landing point deviation according to claim 1, wherein: The first preset distance is 10 to 30 meters.

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

5. The method for measuring 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 is projected upward; and the point C is a point on the plane that is located above the theoretical landing point and is projected vertically 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 to 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.

Images