Test method for high-precision dynamic measurement radar range resolution of small ship

Abstract

The invention discloses a test method for high-precision dynamic measurement of radar range resolution of a small ship, and belongs to the field of radar test. Comprising the steps that high-precision positioning equipment with timestamps is arranged at the position where a radar is located; two small ships are deployed near a proper distance from the radar, and each ship is provided with a metal rod to increase the RCS; each ship is provided with a high-precision positioning device with a timestamp, and a radar system is provided with a timing system device; the connecting line of the two ships passes through the position of the radar, namely the two ships are located in the same direction of the radar; the two ships approach or leave the radar at the same time in the radial direction of the radar, and the distance interval between the two ships is reduced. The radar detects two ships and records information such as tracking data and discovery conditions of two targets; according to the time that the echoes of the two ships can be distinguished, the distance truth values of the two ships relative to the radar are calculated respectively, and the distance truth value difference is the radar distance resolution. The method is high in operability, and can solve the problem that the radar range resolution index test is difficult.

Description

Technical Field

[0001] The invention belongs to the field of radar performance testing and verification. Background Art

[0002] Radar range resolution refers to the minimum distinguishable distance between two targets at different distances at the same angle. It is an important indicator of radar, and its test verification method needs to be scientific and highly operable. Since tests related to sea surface targets are restricted by sea conditions, administrative management and other factors, and are very costly, high requirements are placed on the scientificity and operability of its test methods.

[0003] The current test method often uses ship A to be fixed, ship B to be located on the line connecting ship A to the tested radar, and ship B to slowly approach ship A. When the echoes of ship A and ship B are observed to be tangent on the radar display, the distance between the two ships is the distance resolution of the radar. If the radar moving target signal processing is not turned on, ship A is in a fixed state, and there are many sea clutters, it is very difficult to observe the echo of fixed ship A on the radar display, and it is often difficult to find the echo of ship A; if the radar moving target signal processing is turned on, ship A is in a fixed state, the echo of ship A will be processed, and the echo of ship A cannot be displayed on the display. The above method is difficult to determine the echo tangent time and position information. The current test method is difficult to test the distance resolution index in a real environment. Summary of the invention

[0004] Aiming at the problem that radar range resolution is difficult to test in a real environment, the present invention proposes a test method for high-precision dynamic measurement of radar range resolution of a small vessel.

[0005] In order to achieve the above technical purpose, the technical solution of the present invention is as follows:

[0006] Step 1: The reflective characteristics of the ship target should be small.

[0007] Step 2: The target platform for the radar range resolution test is a small ship on the sea surface. The target ship should be in a sailing state during the test.

[0008] Step 3: This test is based on the navigation status of the target ship on the sea surface. It is a dynamic test. High-precision time synchronization equipment is used to synchronize the radar detection data of the two ships with the real time position data to determine the test data;

[0009] Step 4: The test result of the range resolution is the difference between the true distances of the two ship targets and the radar location.

[0010] Furthermore, step 1 also includes: the length of the vessel is less than 10m, the width is less than 3m, and the material is wood or fiberglass.

[0011] Furthermore, the step 2 also includes: the ship is in a sailing state; the distance between the target and the test object is within a range of 1 / 3 to 2 / 3 of the maximum effective range L of the radar.

[0012] Furthermore, the step 3 also includes: a dynamic distance resolution test of the detected target, by synchronizing the timestamp of the radar's own time synchronization device with the timestamp of the time synchronization device arranged on the ship, to ensure that the radar measurement data is synchronized with the actual position and time of the detected target.

[0013] Furthermore, step 4 includes: placing a positioning device on each of the two ships; the line connecting the two ships passes through the location of the radar, that is, the two ships are located in the same direction of the radar; the two ships simultaneously approach or move away from the radar in the radial direction of the radar, thereby reducing the distance interval between the two ships. According to the time when the echoes of the two ships are distinguishable, the true value difference of the distance between the two ship targets and the location of the radar is calculated by synchronizing the radar detection data and the positioning device data.

[0014] Compared with the existing testing methods, the present invention has the following advantages:

[0015] The conventional radar range resolution test method is optimized. The two small ships are in motion, and the moving target echo is easy to distinguish from the irrelevant clutter on the radar display and control interface; and the moving target echo will not be removed by the passive target signal processing algorithm, so it is easy to find it on the radar display and control interface; it is easy to judge the distinguishable time and position information of the two ship echoes, which can scientifically and effectively solve the problem of the difficulty in actual experimental testing of radar range resolution indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the small dynamic ship radar range resolution test scenario. DETAILED DESCRIPTION

[0017] The testing technical solution of the present invention will be described in detail below with reference to the accompanying drawings and formulas.

[0018] The test method of the present invention is preferably carried out under the following test conditions:

[0019] a) The length of the vessel is less than 10m and the width is less than 3m; the material is fiberglass or wood.

[0020] b) The timing accuracy of the time system equipment shall not exceed 40ms;

[0021] c) The positioning error of high-precision positioning equipment shall not exceed 0.3m, and the timing accuracy shall not exceed 40ms;

[0022] d) The radar has visibility over the target vessel’s navigation area;

[0023] e) The sea conditions in the test area meet the requirements for safe navigation.

[0024] The present invention preferably adopts the following test steps:

[0025] a) Two ships A and B are arranged, and a metal rod or other reflector that meets the requirements is fixed on the bow of each ship. Small ships are anchored within a range of 1 / 3 to 2 / 3 times the maximum radar detection range L.

[0026] b) A high-precision positioning device is arranged at the location of the radar. Test ships A and B are each equipped with a high-precision positioning device, and the arrangement position is as close to the reflector as possible; if it is not possible to get close, ensure that the line connecting the high-precision positioning device and the reflector is parallel to the hull;

[0027] c) The radar equipment is equipped with a high-precision time synchronization device, and the time synchronization error between the time synchronization device and the high-precision positioning device on the ship does not exceed 20ms;

[0028] d) The line connecting ships A and B passes through the location of the radar, that is, the two ships are located in the same direction of the radar; the navigation angle meets the requirement of completely radial to the radar. The starting distance between the two ships is the radar range resolution index. The two ships move away from the radar at the same starting speed in the radial direction of the radar. The ship closer to the radar gradually increases its speed, reducing the distance between the two ships.

[0029] e) The radar equipment starts to search for ship A and ship B. The tracking data (with time stamp) and the discovery information of the two ship target echoes are recorded.

[0030] f) High-precision positioning equipment stores the time and position information of radar and ships in real time. The radar equipment stores the tracking data of the ship (with time stamp) and the discovery of two targets in real time. Observe the time when the radar display and control record the echo of the two ship targets can be distinguished. According to the position information of the radar and the ship at the time when the target echo can be distinguished, the true value difference of the distance between the two ship targets and the radar can be calculated. The minimum value of the true value difference of the distance at multiple times is the radar distance resolution.

[0031] Data processing methods

[0032] The radar range resolution is calculated according to the following formula:

[0033] d=||CA|-|CB||

[0034] C(x, y): The actual radar coordinates of the test object

[0035] A(x, y): The coordinates of ship A when it is just resolved as 2 targets

[0036] B(x, y): The coordinates of ship B when it is just resolved as 2 targets

[0037] d: Radar range resolution

[0038] Example:

[0039] Select two wooden boats with a length of 6m and a width of 2m. Select a stainless steel metal pole with a height of 1.5m and a diameter of 8cm. Select two high-precision positioning devices with a time synchronization accuracy of 30ms and a positioning error of 0.5m. Select a high-precision time synchronization device, and the time synchronization error between the time synchronization device and the high-precision positioning device is 30ms.

[0040] A stainless steel metal rod is fixed on the bow of each ship. A high-precision positioning device is arranged on the bow of each ship, and the high-precision positioning device is placed at the bottom of the metal rod. A high-precision time synchronization device is arranged at the radar equipment.

[0041] Each ship conducts the test under natural conditions where the ship can sail safely, ensuring that the ship's navigation area is within the radar's line of sight. The line connecting the two ships passes through the location of the radar, that is, the two ships are located in the same direction of the radar; the navigation area of ​​the two ships is within the range of 1 / 3 to 2 / 3 of the maximum effective range L of the radar detection, and they sail from 1 / 3 of the maximum effective range L to 2 / 3 of the maximum effective range L. The navigation angle meets the requirement of full radial direction for the radar. The starting distance between the two ships is the radar range resolution index. The two ships move away from the radar at the same starting speed in the radial direction of the radar at the same time. The ship closer to the radar gradually increases its speed to reduce the distance interval between the two ships. The radar starts to detect the two ships and records the tracking data (with time stamp) and resolvable time of the target echoes of the two ships.

[0042] According to the above formula, calculate the true distance value of the two ship targets relative to the radar at 8 resolvable moments, and take the minimum value of the true distance value at 8 moments, which is the radar distance resolution. Fill in the results in Table 1.

[0043] Table 1 Radar range resolution test record Date: Location:

[0044]

[0045] Note: The minimum value of 8 test data is the distance resolution test result.

Claims

1. A test method for high-precision dynamic measurement of radar range resolution of small vessels, characterized by: Step 1: The reflection characteristics of the ship target are small; Step 2: The target platform for the radar range resolution test is a small ship on the sea surface. The target ship should be in a sailing state during the test. Step 3: The test is based on the navigation status of the target ship on the sea surface, which is a dynamic test. The time synchronization equipment is used to synchronize the radar detection data of the two ships with the real time position data to determine the test data; Step 4: The test result of the range resolution is the difference between the true distances of the two ship targets and the radar location.

2. The test method for high-precision dynamic measurement of radar range resolution of small vessels according to claim 1 is characterized by: The step 1 also includes: the length of the vessel is less than 10m, the width is less than 3m, and the material is wood or fiberglass.

3. The test method for high-precision dynamic measurement of radar range resolution of small vessels according to claim 1 is characterized by: The step 2 also includes: the ship is in a sailing state; the distance between the target and the test object is within a range of 1 / 3 to 2 / 3 of the maximum range L of the radar.

4. The test method for high-precision dynamic measurement of radar range resolution of small vessels according to claim 1 is characterized by: The step 3 also includes: a dynamic distance resolution test of the detected target, by synchronizing the time stamp of the radar's own time system equipment with the time stamp of the time system equipment arranged on the ship, to ensure that the radar measurement data is synchronized with the real position and time of the detected target.

5. The test method for high-precision dynamic measurement of radar range resolution of small vessels according to claim 1 is characterized by: A positioning device is placed on each of the two ships; the line connecting the two ships passes through the location of the radar, that is, the two ships are located in the same direction of the radar; the two ships approach or move away from the radar at the same time in the radial direction of the radar, reducing the distance between the two ships; according to the moment when the echoes of the two ships are distinguishable, the true value difference of the distance between the two ship targets and the radar is calculated through the synchronization of radar detection data and positioning device data.

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