Method for screening unqualified parts of position marker by using high and low temperature test in advance

Abstract

The invention relates to a method for screening unqualified parts of a position marker by using high and low temperature tests in advance, and belongs to the technical field of position marker inspection. Comprising the following steps: testing six temperature sections including normal temperature, cooling, low-temperature whole section, heating, high-temperature whole section and normal temperature after high and low temperature according to a bit marker checking method, ensuring that the test is passed, otherwise, checking and replacing unqualified parts, according to a method for detecting the reliability of the position marker motor under various stress conditions, carrying out position marker follow-up tests; through the two steps, the possibility of retesting the position marker due to faults of unqualified parts including a gyroscope is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the field of position markers, and in particular relates to a method for screening unqualified parts of position markers by using high and low temperature tests in advance, in particular to a gyroscope. Background Art

[0002] The position marker is equipped with antennas / other sensors and is widely used. Due to the harsh working environment, a large number of tests are required. If a problem occurs in any link of the test, it is required to find the problem and restart the test at that link after the problem is solved.

[0003] The other parts of the re-test are still tolerable, but the temperature cycle part consumes more resources and is very costly to re-test. Among the components that make up the position marker, the gyroscope is most likely to have problems within the temperature range, requiring the test to be re-tested.

[0004] At the same time, no useful information was found in the relevant literature. Summary of the invention

[0005] The technical problems to be solved by the present invention are:

[0006] In order to avoid the shortcomings of the prior art, the present invention provides a method for screening unqualified parts of a position marker by using high and low temperature tests in advance.

[0007] Since the gyro temperature range is not enough, a position marker high and low temperature test should be arranged before starting the shock, vibration and temperature cycle tests. This can screen out such unqualified components or gyros, successfully pass the subsequent tests, and avoid the waste caused by redoing the test. The method steps are as follows:

[0008] A method for screening unqualified parts of a position marker by using a high and low temperature test in advance, characterized in that the steps are as follows:

[0009] Step 1: According to the calibration device inspection method, conduct 6 temperature section tests, including normal temperature, cooling, low temperature full section, heating, high temperature full section, and normal temperature after high and low temperature, to ensure that the test is passed. Otherwise, check and replace unqualified parts, the most likely of which is the gyro part, and then go to the first step;

[0010] Step 2: Perform subsequent tests on the position marker according to the method for testing the reliability of the position marker motor under various stress conditions;

[0011] The above two steps effectively reduce the possibility of the position marker having to be retested due to failure of unqualified components including the gyroscope.

[0012] A further technical solution of the present invention: the method for verifying the position marker described in step 1 comprises:

[0013] Step 11: After the position marker is powered on, set up the storage file in the control interface to record the subsequent position marker inspection control process. The file name contains the test condition information and positions the two axes at their respective center angles.

[0014] Step 12: Perform steady-speed scanning of the two axes according to the method of detecting whether the position marker is oscillating during steady-speed tracking, and check and eliminate the hidden danger of oscillation;

[0015] Step 13: Set the movement direction to positive, position the current axis and the other axis at 0°, set the speed to 0° / S, perform a 0° / S steady-speed tracking scan for 1 minute on both axes, measure the zero drift generated during this time, and then reposition to 0°;

[0016] Step 14: The current axis and the other axis respectively perform the process of positioning the positive symmetric angle, 0°, the negative symmetric angle, and 0° in sequence, and record the positioning accuracy and time during the process;

[0017] Step 15: After the test is completed, the data file is stored.

[0018] A further technical solution of the present invention: the method for detecting whether the steady-speed tracking of the position marker is oscillating comprises:

[0019] (1) Place both the azimuth and pitch axes at their negative extreme positions in the direction of the 10% symmetric angle range of their symmetry centers. The azimuth axis steady-speed tracking speed is selected from one of the levels that is increased step by step from the minimum speed to the maximum speed. The frequency is set to the value corresponding to 90% of the motion range evenly divided by the azimuth axis symmetry center at this speed. For a certain speed and frequency selected for the azimuth axis, the pitch axis steady-speed tracking speed is also increased step by step from the minimum speed to the maximum speed. The frequency corresponding to the selected pitch speed is also set to the value corresponding to 90% of the motion range evenly divided by the symmetry center of the pitch axis at this speed. The speed combination of each level of steady-speed tracking of azimuth and pitch shall move at least 3 cycles per axis to complete the steady-speed tracking motion combination of all speed levels of the two axes;

[0020] (2) Position the current axis at the negative limit angle and the other axis at the center of motion;

[0021] (3) Set the speed to 1° / S, and the current axis completes a continuous forward tracking scan at a steady speed of 1° / S from the negative limit angle to the positive limit angle. After completion, the current axis is positioned at the center angle, and the other axis is positioned at the negative limit angle. Then, the axis completes a continuous forward tracking scan at a steady speed of 1° / S from the negative limit angle to the positive limit angle.

[0022] (4) Position the other axis at the negative limit angle and the current axis at the center of motion;

[0023] (5) The speed is set to the maximum speed, and the other axial direction completes continuous positive maximum steady-speed tracking and scanning from the negative limit angle to the positive limit angle. After completion, the other axial direction is positioned at the center angle, and the current axial direction is positioned at the negative limit angle. Then, the axial direction completes continuous positive maximum steady-speed tracking and scanning from the negative limit angle to the positive limit angle.

[0024] (6) Set the movement direction to the reverse direction, position the current axis at the positive limit angle, and position the other axis at the center of movement;

[0025] (7) The current axial direction completes continuous negative maximum steady-speed tracking and scanning from the positive limit angle to the negative limit angle. After completion, the current axial direction is positioned at the center angle, and the other axial direction is positioned at the positive limit angle. Then, the axial direction completes continuous negative maximum steady-speed tracking and scanning from the positive limit angle to the negative limit angle.

[0026] (8) Position the other axial direction at the positive limit angle, and position the current axial direction at the center of motion;

[0027] (9) Set the speed to 1° / S, and the other axis completes a continuous negative 1° / S steady-speed tracking scan from the positive limit angle to the negative limit angle. After completion, the other axis is positioned at the center angle, and the current axis is positioned at the positive limit angle. Then, the axis completes a continuous negative 1° / S steady-speed tracking scan from the positive limit angle to the negative limit angle.

[0028] A further technical solution of the present invention: the method for testing the reliability of the position marker motor under various stress conditions comprises the following steps:

[0029] Step 21: Conduct vibration and impact tests to simulate the normal flight conditions of the position marker, and power on and test the position marker function according to the position marker inspection method to ensure normal operation;

[0030] Step 22: Conduct temperature shock cycle test, simulate the aerial working condition of the position marker in the cooling, low temperature full stage, heating, and high temperature full stage, and power on to detect whether the position marker functions normally according to the position marker inspection method. This method can detect whether there is ice inside the motor that cannot be controlled. For the products that have been detected, the designer should find a way to solve the problem, continue to conduct and pass the temperature shock cycle test; for the products with normal functions, determine the gyro zero position as the optimal state in the low temperature stable stage and the high temperature stable stage according to the method of calibrating (compensating) the position marker gyro zero position through normal temperature, temperature cycle and high and low temperature test;

[0031] Step 23: In the subsequent high and low temperature tests, the power-on test is carried out according to the position marker inspection method in the cooling stage, the low temperature full stage, the heating stage, and the high temperature full stage to ensure that the motor of the position marker is not frozen and cannot be controlled, and the function is normal; for products with normal functions, the gyro zero position is determined to be the optimal state in the low temperature stable stage and the high temperature stable stage according to the method of calibrating (compensating) the position marker gyro zero position through normal temperature, temperature cycle, and high and low temperature tests;

[0032] Step 24: When the position marker returns to normal temperature on the second day after the high and low temperature test, test the position marker again according to the position marker inspection method to ensure normal function.

[0033] A further technical solution of the present invention: The method for calibrating (compensating) the zero position of the gyro of the position marker through normal temperature, temperature cycle and high and low temperature tests comprises:

[0034] 1) Calibrate the zero position of the gyro of the position marker under normal temperature environment. In order to balance the zero drift (zero drift) of the position marker under temperature cycle, high and low temperature conditions in the whole temperature range, do not calibrate the gyro zero position to no drift at all, but allow it to float within the index range of ± (10 ~ 20)%;

[0035] 2) In the low temperature stage of the first cycle of the temperature cycle, record the low temperature gyro zero drift data after the temperature is stable, and in the high temperature stage, record the high temperature gyro zero drift data after the temperature is stable. At the same time, combine the low temperature and high temperature gyro zero drift data to check whether the zero drift under high temperature and low temperature conditions can achieve the effect of balanced distribution in the indicator error band and the optimal effect at room temperature. If it is not achieved, correct the calibration result of the gyro zero under room temperature conditions, and record the modified high temperature gyro zero drift data. If it is achieved, go directly to the next step;

[0036] 3) In the low temperature stage of the second cycle of the temperature cycle, after the temperature is stable, record the low temperature gyro zero drift data to check whether the expected equilibrium state under low temperature conditions is achieved. If there is a deviation, fine-tune the calibration result corrected in step 2) according to the polarity of the deviation, and record the modified low temperature gyro zero drift data. In the high temperature stage, after the temperature is stable, record the high temperature gyro zero drift data, and continue to check whether the expected equilibrium state under high temperature conditions is achieved. If there is a deviation, fine-tune the calibration result corrected in the low temperature stage of this cycle according to the polarity of the deviation, and record the modified high temperature gyro zero drift data;

[0037] 4) After the correction and fine-tuning of the two cycles of temperature cycle, in the subsequent cycles until the completion, record the gyro zero drift data in the cooling, low temperature, heating and high temperature stages respectively to check whether they meet the requirements of step 2);

[0038] 5) In the subsequent high and low temperature tests, save the gyro zero drift data of the corresponding temperature sections of cooling, low temperature, heating, and high temperature. When deviation occurs, fine-tune the previous calibration results according to the method introduced in step 3) to achieve the required effect of step 2);

[0039] 6) After the product returns to normal temperature, test and record the normal temperature gyro zero drift data, check to ensure that it meets the optimal normal temperature requirements, and complete the position marker gyro zero position calibration (compensation).

[0040] The beneficial effects of the present invention are:

[0041] The present invention provides a method for screening unqualified parts of a position marker by using high and low temperature tests in advance, which can achieve the following benefits in reducing the possibility of retesting the position marker:

[0042] 1. Simple, easy and efficient;

[0043] 2. Make full use of the unit's equipment resources;

[0044] 3. Achieve maximum cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0046] Figure 1 The present invention discloses a flow chart of a method for screening unqualified parts of a position marker, especially a gyroscope, by using high and low temperature tests in advance.

[0047] Figure 2 A flowchart of a method for screening unqualified components of a position marker, especially a gyroscope, by using high and low temperature tests in advance is disclosed. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Example:

[0050] Schematic diagram of the embodiment of the present invention is shown in Figure 2 .

[0051] In order to avoid retesting due to unqualified gyro temperature range, a high and low temperature test is specially arranged in advance to screen out unqualified gyro and successfully pass the subsequent test. The method steps are as follows:

[0052] First, according to the calibration device inspection method, conduct 6 temperature section tests, including normal temperature, -40℃ cooling, -40℃ full section, 60℃ heating, 60℃ full section, high and low temperature and normal temperature, to ensure that the test is passed. Otherwise, check and replace unqualified components, the most likely of which is the gyro component, and then go to the first step;

[0053] Second, follow-up tests of the position marker are carried out according to the method of verifying the reliability of the position marker motor under various stress conditions.

[0054] The above two steps can effectively reduce the possibility of the position marker having to repeat the test due to gyro failure.

[0055] The method of high and low temperature verification of the position marker includes:

[0056] (1) After the position marker is powered on, a storage file is set in the control interface to record the subsequent position marker inspection control process. The file name contains the test condition information and the two axes are positioned at the center angles of 0° and 0° respectively;

[0057] (2) Perform steady-speed scanning of the two axes according to the method of detecting whether the position marker is oscillating during steady-speed tracking, and check and eliminate the hidden danger of oscillation; specifically:

[0058] (2a) The azimuth and elevation axes are placed at their negative extreme positions, deviating from their symmetry centers by about 10% of the symmetry angle range. The azimuth axis steady-speed tracking speed is selected to be increased from the minimum speed of 0.1° / S to one of the maximum speeds of 5° / S, and the frequency is set to the value corresponding to 90% of the motion range evenly divided by the azimuth axis symmetry center at this speed. For a certain speed and frequency selected for the azimuth axis, the pitch axis steady-speed tracking speed is also increased from the minimum speed of 0.1° / S to the maximum speed of 5° / S, and the frequency corresponding to the selected pitch speed is also set to the value corresponding to 90% of the motion range evenly divided by the symmetry center of the pitch axis at this speed. The speed combination of each level of steady-speed tracking of azimuth and pitch shall be performed for at least 3 cycles for each axis to complete the steady-speed tracking motion combination of all speed levels of the two axes;

[0059] (2b) Position the azimuth axis at the negative limit angle of -24° and the elevation axis at the center of motion 0°;

[0060] (2c) The speed is set to 1° / S, and the azimuth axis completes a continuous positive tracking scan at a steady speed of 1° / S from the negative limit angle to the positive limit angle. After completion, the azimuth axis is positioned at a center angle of 0°, and the pitch axis is positioned at a negative limit angle of -18°. Then, the pitch axis completes a continuous positive tracking scan at a steady speed of 1° / S from the negative limit angle to the positive limit angle.

[0061] (2d) Position the elevation axis at the negative limit angle of -18° and the azimuth axis at the center of motion 0°;

[0062] (2e) The speed is set to the maximum speed of 5° / S, and the pitch axis completes continuous positive maximum steady-speed tracking and scanning from the negative limit angle to the positive limit angle. After completion, the pitch axis is positioned at the center angle of 0°, and the azimuth axis is positioned at the negative limit angle of -24°. Then, the azimuth axis completes continuous positive maximum steady-speed tracking and scanning from the negative limit angle to the positive limit angle.

[0063] (2f) Set the movement direction to the reverse direction, position the azimuth axis at the positive limit angle of 24°, and position the elevation axis at the movement center position of 0°;

[0064] (2g) The azimuth axis completes continuous negative maximum steady-speed tracking scan from the positive limit angle to the negative limit angle. After completion, the azimuth axis is positioned at the center angle of 0°, and the elevation axis is positioned at the positive limit angle of 18°. The elevation axis then completes continuous negative maximum steady-speed tracking scan from the positive limit angle to the negative limit angle.

[0065] (2h) Position the elevation axis at the positive limit angle of 18° and the azimuth axis at the center of motion of 0°;

[0066] (2i) The speed is set to 1° / S. The pitch axis completes a continuous negative 1° / S steady-speed tracking scan from the positive limit angle to the negative limit angle. After completion, the other axis is positioned at the center angle of 0°, and the azimuth axis is positioned at the positive limit angle of 24°. Then, the azimuth axis completes a continuous negative 1° / S steady-speed tracking scan from the positive limit angle to the negative limit angle.

[0067] (3) Set the movement direction to the positive direction, set the azimuth and pitch to 0°, set the speed to 0° / S, perform a 0° / S steady-speed tracking scan on both axes for 1 minute, measure the zero drift generated during this time, and then reposition to 0°;

[0068] (4) The azimuth and elevation axes are positioned at 10°, 0°, -10°, and 0°, respectively, and the positioning accuracy and time are recorded;

[0069] (5) The test is completed and the data file is stored.

[0070] The method for testing the reliability of the position marker motor under a given temperature stress includes:

[0071] First, conduct vibration and impact tests to simulate the normal flight conditions of the position marker, and power on and test the position marker function according to the position marker inspection method to ensure normal operation;

[0072] Second, conduct a -40-60℃ temperature shock cycle test, simulate the working conditions of the position marker in the air in the cooling, low-temperature full stage, heating, and high-temperature full stage, and power on to test the position marker function according to the position marker inspection method, and detect whether there is ice inside the motor that cannot be controlled. For the products that are detected, the designer should find a way to solve the problem and continue to pass the temperature shock cycle test; for products with normal functions, determine the gyro zero position as the optimal state in the low-temperature stable stage and the high-temperature stable stage according to the method of calibrating (compensating) the position marker gyro zero position through normal temperature, temperature cycle, and high and low temperature tests;

[0073] Third, in the subsequent -40~60℃ high and low temperature test, the position marker shall be powered on and tested according to the method of position marker inspection in the cooling stage, the whole low temperature stage, the heating stage, and the whole high temperature stage to ensure that the motor of the position marker is not frozen and cannot be controlled, and the function is normal; for products with normal function, the gyro zero position shall be determined to be the optimal state in the low temperature stable stage and the high temperature stable stage according to the method of calibrating (compensating) the position marker gyro zero position through normal temperature, temperature cycle and high and low temperature tests;

[0074] Fourth, when the position marker returns to normal temperature on the second day after the high and low temperature test, test the position marker according to the position marker inspection method to ensure normal function.

[0075] The above four steps ensure the reliability of the position marker motor under various stress conditions.

[0076] Among them, the method of calibrating (compensating) the zero position of the gyro of the position marker through normal temperature, temperature cycle and high and low temperature tests includes:

[0077] (1) Calibrate the zero position of the gyro of the position marker under normal temperature environment. In order to balance the zero position drift (zero drift) of the position marker under temperature cycle, high and low temperature conditions and distribute it evenly in the whole temperature range, do not calibrate the gyro zero position to no drift at all, but allow it to float within the index range of ±20%;

[0078] (2) Record the low-temperature gyro zero drift data after the temperature stabilizes in the low-temperature stage of the first cycle of the temperature cycle at -50 to 60°C, and record the high-temperature gyro zero drift data after the temperature stabilizes in the high-temperature stage. At the same time, combine the low-temperature gyro zero drift data and the high-temperature gyro zero drift data to check whether the zero drift under high and low temperature conditions achieves the effect of balanced distribution in the indicator error band and the optimal effect at room temperature. If it is not achieved, correct the calibration result of the gyro zero under room temperature conditions, and record the modified high-temperature gyro zero drift data. If it is achieved, go directly to the next step;

[0079] (3) After the temperature stabilizes at the low temperature stage of the second cycle of the temperature cycle, record the low temperature gyro zero drift data to check whether the expected equilibrium state under low temperature conditions is achieved. If there is a deviation, fine-tune the calibration result corrected in step (2) according to the polarity of the deviation, and record the modified low temperature gyro zero drift data. After the temperature stabilizes at the high temperature stage, record the high temperature gyro zero drift data to continue to check whether the expected equilibrium state under high temperature conditions is achieved. If there is a deviation, fine-tune the calibration result corrected in the low temperature stage of this cycle according to the polarity of the deviation, and record the modified high temperature gyro zero drift data;

[0080] (4) After two cycles of correction and fine-tuning, in the subsequent cycles until the completion, record the gyro zero drift data at the cooling, low temperature, heating, and high temperature stages to check whether they meet the requirements of step (2);

[0081] (5) During the -50 to 60°C high and low temperature test, save the gyro zero drift data for the corresponding temperature ranges of cooling, low temperature, heating, and high temperature. When deviation occurs, fine-tune the previous calibration results according to the method described in step (3) to achieve the required effect of step (2);

[0082] (6) After the product returns to normal temperature, test and record the normal temperature gyro zero drift data to ensure that it meets the optimal normal temperature requirements and complete the gyro zero position calibration (compensation) of the position marker.

[0083] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A method for screening unqualified parts of a position marker by using high and low temperature tests in advance, characterized in that: Here are the steps: Step 1: According to the calibration device inspection method, conduct 6 temperature section tests, including normal temperature, cooling, low temperature full section, heating, high temperature full section, and normal temperature after high and low temperature, to ensure that the test is passed. Otherwise, check and replace unqualified parts, the most likely of which is the gyro part, and then go to the first step; Step 2: Perform subsequent tests on the position marker according to the method for testing the reliability of the position marker motor under various stress conditions; The above two steps effectively reduce the possibility of the position marker having to be retested due to failure of unqualified components including the gyroscope.

2. The method for screening gyroscopes by using high and low temperature tests according to claim 1, characterized in that: The method for verifying the position marker includes: Step 11: After the position marker is powered on, set up the storage file in the control interface to record the subsequent position marker inspection control process. The file name contains the test condition information and positions the two axes at their respective center angles. Step 12: Perform steady-speed scanning of the two axes according to the method of detecting whether the position marker is oscillating during steady-speed tracking, and check and eliminate the hidden danger of oscillation; Step 13: Set the movement direction to positive, position the current axis and the other axis at 0°, set the speed to 0° / S, perform a 0° / S steady-speed tracking scan for 1 minute on both axes, measure the zero drift generated during this time, and then reposition to 0°; Step 14: The current axis and the other axis respectively perform the process of positioning the positive symmetric angle, 0°, the negative symmetric angle, and 0° in sequence, and record the positioning accuracy and time during the process; Step 15: The test is completed and the data file is stored.

3. The method for screening gyroscopes by using high and low temperature tests according to claim 2, characterized in that: The method for detecting whether the steady-speed tracking of the position marker is oscillating comprises: (1) Place both the azimuth and pitch axes at their negative extreme positions in the direction of the 10% symmetric angle range of their symmetry centers. The azimuth axis steady-speed tracking speed is selected from one of the levels that is increased step by step from the minimum speed to the maximum speed. The frequency is set to the value corresponding to 90% of the motion range evenly divided by the azimuth axis symmetry center at this speed. For a certain speed and frequency selected for the azimuth axis, the pitch axis steady-speed tracking speed is also increased step by step from the minimum speed to the maximum speed. The frequency corresponding to the selected pitch speed is also set to the value corresponding to 90% of the motion range evenly divided by the symmetry center of the pitch axis at this speed. The speed combination of each level of steady-speed tracking of azimuth and pitch shall move at least 3 cycles per axis to complete the steady-speed tracking motion combination of all speed levels of the two axes; (2) Position the current axis at the negative limit angle and the other axis at the center of motion; (3) Set the speed to 1° / S, and the current axis completes a continuous forward tracking scan at a steady speed of 1° / S from the negative limit angle to the positive limit angle. After completion, the current axis is positioned at the center angle, and the other axis is positioned at the negative limit angle. Then, the axis completes a continuous forward tracking scan at a steady speed of 1° / S from the negative limit angle to the positive limit angle. (4) Position the other axis at the negative limit angle and the current axis at the center of motion; (5) The speed is set to the maximum speed, and the other axial direction completes continuous positive maximum steady-speed tracking and scanning from the negative limit angle to the positive limit angle. After completion, the other axial direction is positioned at the center angle, and the current axial direction is positioned at the negative limit angle. Then, the axial direction completes continuous positive maximum steady-speed tracking and scanning from the negative limit angle to the positive limit angle. (6) Set the movement direction to the reverse direction, position the current axis at the positive limit angle, and position the other axis at the center of movement; (7) The current axial direction completes continuous negative maximum steady-speed tracking and scanning from the positive limit angle to the negative limit angle. After completion, the current axial direction is positioned at the center angle, and the other axial direction is positioned at the positive limit angle. Then, the axial direction completes continuous negative maximum steady-speed tracking and scanning from the positive limit angle to the negative limit angle. (8) Position the other axial direction at the positive limit angle, and position the current axial direction at the center of motion; (9) Set the speed to 1° / S, and the other axis completes a continuous negative 1° / S steady-speed tracking scan from the positive limit angle to the negative limit angle. After completion, the other axis is positioned at the center angle, and the current axis is positioned at the positive limit angle. Then, the axis completes a continuous negative 1° / S steady-speed tracking scan from the positive limit angle to the negative limit angle.

4. The method for screening gyroscopes by using high and low temperature tests according to claim 1, characterized in that: The method for testing the reliability of the position marker motor under various stress conditions comprises the following steps: Step 21: Conduct vibration and impact tests to simulate the normal flight conditions of the position marker, and power on and test the position marker function according to the position marker inspection method to ensure normal operation; Step 22: Conduct temperature shock cycle test, simulate the aerial working condition of the position marker in the cooling, low temperature full stage, heating, and high temperature full stage, and power on to detect whether the position marker functions normally according to the position marker inspection method. This method can detect whether there is ice inside the motor that cannot be controlled. For the products that have been detected, the designer should find a way to solve the problem, continue to conduct and pass the temperature shock cycle test; for the products with normal functions, determine the gyro zero position as the optimal state in the low temperature stable stage and the high temperature stable stage according to the method of calibrating (compensating) the position marker gyro zero position through normal temperature, temperature cycle and high and low temperature test; Step 23: In the subsequent high and low temperature tests, the power-on test is carried out according to the position marker inspection method in the cooling stage, the low temperature full stage, the heating stage, and the high temperature full stage to ensure that the motor of the position marker is not frozen and cannot be controlled, and the function is normal; for products with normal functions, the gyro zero position is determined to be the optimal state in the low temperature stable stage and the high temperature stable stage according to the method of calibrating (compensating) the position marker gyro zero position through normal temperature, temperature cycle, and high and low temperature tests; Step 24: When the position marker returns to normal temperature on the second day after the high and low temperature test, test the position marker again according to the position marker inspection method to ensure normal function.

5. The method for screening gyroscopes by using high and low temperature tests according to claim 4, characterized in that: The method for calibrating (compensating) the zero position of the gyro of the position marker through normal temperature, temperature cycle and high and low temperature tests includes: 1) Calibrate the zero position of the gyro of the position marker under normal temperature environment. In order to balance the zero drift (zero drift) of the position marker under temperature cycle, high and low temperature conditions in the whole temperature range, do not calibrate the gyro zero position to no drift at all, but allow it to float within the index range of ± (10 ~ 20)%; 2) In the low temperature stage of the first cycle of the temperature cycle, record the low temperature gyro zero drift data after the temperature is stable, and in the high temperature stage, record the high temperature gyro zero drift data after the temperature is stable. At the same time, combine the low temperature and high temperature gyro zero drift data to check whether the zero drift under high temperature and low temperature conditions can achieve the effect of balanced distribution in the indicator error band and the optimal effect at room temperature. If it is not achieved, correct the calibration result of the gyro zero under room temperature conditions, and record the modified high temperature gyro zero drift data. If it is achieved, go directly to the next step; 3) In the low temperature stage of the second cycle of the temperature cycle, after the temperature is stable, record the low temperature gyro zero drift data to check whether the expected equilibrium state under low temperature conditions is achieved. If there is a deviation, fine-tune the calibration result corrected in step 2) according to the polarity of the deviation, and record the modified low temperature gyro zero drift data. In the high temperature stage, after the temperature is stable, record the high temperature gyro zero drift data, and continue to check whether the expected equilibrium state under high temperature conditions is achieved. If there is a deviation, fine-tune the calibration result corrected in the low temperature stage of this cycle according to the polarity of the deviation, and record the modified high temperature gyro zero drift data; 4) After the correction and fine-tuning of the two cycles of temperature cycle, in the subsequent cycles until the completion, record the gyro zero drift data in the cooling, low temperature, heating and high temperature stages respectively to check whether they meet the requirements of step 2); 5) In the subsequent high and low temperature tests, save the gyro zero drift data of the corresponding temperature sections of cooling, low temperature, heating, and high temperature. When deviation occurs, fine-tune the previous calibration results according to the method introduced in step 3) to achieve the required effect of step 2); 6) After the product returns to normal temperature, test and record the normal temperature gyro zero drift data, check to ensure that it meets the optimal normal temperature requirements, and complete the position marker gyro zero position calibration (compensation).

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