Typical high-precision radar structure precision design and implementation method
A technology of precision design and implementation method, applied to radio wave measurement systems, instruments, etc., can solve the problems of reducing the implementation cost, low sidelobe level of radar, pointing accuracy, etc.
Pending Publication Date: 2022-03-11
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Problems solved by technology
At present, the scientific rationality of the allocation of structural accuracy indicators needs to be improved. It is necessary to sort out the corresponding relationship between structural accuracy indicators and telecommunication indicators, and analyze in detail the impact of each error influencing factor on structural accuracy, and provide a specific allocation plan in combination with typical radars to form antenna system pointing. The unified calculation method of precision makes the radar structure precision not only meet the requirements of use, but also reduce the ...
Structural accuracy measurement and calibration, structural accuracy measurement comprehensively utilizes double theodolite measurement system, total station measurement system and industrial photogrammetry system (or laser tracker), formulates geodetic scheme, can complete antenna system three-axis orthogonality Inspection, antenna array flatness inspection and other work. Structural accuracy calibration makes the electrical axis coincide with the mechanical axis through the transition of the optical axis, and realizes the calibration of the consistency between the electrical axis and the mechanical axis of the array.
 The present invention is a typical high-precision radar structural precision design and implementation method, the allocation of structural precision, antenna system pointing precision calculation, structural precision measurement and correction, to achieve high-precision radar structural precision and telecommunications indicators to match.
The invention relates to a typical high-precision radar structural precision design and implementation method, which comprises the following steps of structural precision error influence factor analysis, structural precision distribution, antenna system pointing precision error calculation and structural precision measurement and calibration. Different precision error influence factors of the structure are comprehensively analyzed and calculated, a technical implementation route of precision distribution, measurement and calibration of each structure is given, and the research difficulty and the high-precision assembly requirement of a radar system are reduced. By applying the method, the radar structure precision can be analyzed, distributed, calculated, measured and calibrated. And meanwhile, by customizing a radar parameterization structure precision design tool, the pointing precision of the antenna system can be calculated in real time according to each error influence factor, a theoretical basis is provided for reasonable matching of the structure precision and a telecommunication index, and the structure precision design is changed from empirical analysis to quantitative analysis.
Wave based measurement systems
Radar systemsElectrical and Electronics engineering +2
- Experimental program(1)
 The present invention is a typical high-precision radar structural precision design and implementation, the distribution of structural accuracy, antenna system points to accuracy computing, structural precision measurement, and amendment to achieve high-precision radar structural accuracy and telecommunications indicators.
 The method of this embodiment includes structural accuracy error affecting factors analysis, structural precision distribution, antenna system pointing accuracy error calculation, structural precision measurement and calibration. Through a typical high-precision radar structure accuracy design and implementation, the radar antenna, antenna transmission and the servo transmission mechanism are accurately computational, reasonable accuracy allocation, accuracy measurement, and implement the balance of structural accuracy and telecommunications accuracy. At the same time, according to each influencing factor, the point-to-pending accuracy and front-level plane of telecommunications requirements are displayed, which help to improve the scientific and clearness of structural precision index allocation. The technology architecture of the present invention figure 1 Disted, where:
 Analysis of factors of structural precision error, including array precision error, antenna seat axis accuracy error, and analysis of the factors of standard accuracy error. The array accuracy error is mainly caused by the following factors: array assembly error, array assembly error, load deformation error, temperature load deformation error. The antenna seat axis accuracy error mainly includes an unmatched error, the pitch shaft is not horizontally, and the mechanical axis is not vertically error in the pitch axis. The inner position of the inner shaft is caused by the following factors: the platform level, the bearing end hop, bearing With the installation accuracy of the turntable and the installation accuracy of the bearing and the base, the pitch shaft is not horizontally caused by the following factors: the antenna seat is deformed, the pitch bearing housing is high, the pitch bearing is jumped, the pitch bearing swell, etc .; mechanical axis pair The non-vertical error of the pitch axis is caused by the following factors: the antenna seat pitch shaft is not level, the antenna array structure is accurate, the antenna array plane is flat. The accuracy error of the electric shaft and mechanical axis is mainly comprised of a positioning assembly, the pitch standard error, wherein the orientation matrix error is caused by the following factors: the telescope is mounted on the blade and the array verticalness, optical axis and base platform Land (mounting surface) parallelism, optical resolution, etc .; pitch scales are caused by the following factors: the telescope is positioned with the array surface and the optical axis and the base platform parallelism, optical resolution, and the like.
 Structural precision allocation, in the antenna system points to accurate error distribution, the structure mainly includes the surface precision error, the axial precision error and the standard accuracy error. According to the analysis of factors affecting the structural accuracy error, calculation of each influencing factor error value, allocation formation of the array plane degree index, the three axial precision indicators of the antenna holder, the electrical axis and the mechanical axis in orientation.
 Antenna system points to accurate error calculation, and the pointing accuracy error includes static errors and dynamic errors, where static error includes random error and fixed error. Random error influencing factors include thermal noise, inconsistency, phase phase, etc. When calculating an antenna system pointing accuracy, the antenna block has a degree angle error and pitch angle error caused by an antenna system in an antenna system pointing to accuracy static errors, an infrastructure basis, and even windmakes, and the pitch angle error resulting from antenna system pointing accuracy dynamic error. The electrical axis and the mechanical axis are in the orientation and pitch to obtain an antenna system pointing to the accuracy index error, and the above error summates the root (referred to as average square root), and finally calculate the antenna system pointing to the total error of the accuracy. Among them, the mechanical axis accuracy error of antenna system is calculated in real time according to each error affecting the factors in accordance with each error. Antenna system mechanical axis accuracy error affects the default of the recommended value, and can perform structural modular assembly according to different antenna systems, and the parameterization input is implemented corresponding to each influencing factors, and the mechanical axis accuracy calculation results provide visualization interactive environment.
 Structural precision measurement and calibration, structural accuracy measurement Comprehensive utilization of double-coil measurement system, total station measurement system and industrial photogrammetry system (or laser tracker), a large land measurement scheme can be completed, and the antenna system three-axis regular assault detection, antenna Front plane detection and other work. The structural precision is calibrated by the optical axis transition to coincide with the mechanical axis to achieve a calibration of the array electrical axis and mechanical axis.
 Taking the pitch-azimuth high-precision radar antenna system as an example, the specific embodiments are as follows:
 1. Analysis of factors affecting structural precision error
 The positional accuracy between the array surface antenna unit affects the radar electrical performance index, and the mean square error of each radiation unit position is within the Δ flat. The analysis of the influencing factors of the antenna array accuracy is as follows:
 (1) Front assembly error:
 In the same active sub-array, the location error of the unit:
 In the same sub-array, the location error of the unit:
 In the antenna array, the location error of the unit:
 Taking each of the position error resulting square root and front assembly error Δ 1.
 (2) front assembly error:
 Assembly error Δ 2.
 (3) deformation under load error:
 Weight load deformation error Δ 3.
 (4) heat deflection temperature error:
 Temperature load deformation error Δ 4.
 Effects of various factors on the antenna base shaft axis error accuracy error independent and not interrelated factors, as follows:
 (1) is not perpendicular to the azimuth axis error
 Axis is not perpendicular orientation error of the turret error shaking leveling error sum azimuth axis. Azimuth bearing raceway i.e. the reaction of a horizontal plane azimuth accuracy shaft, which main factors: the level of the platform, jump bearing end, the bearing mounting accuracy and mounting accuracy of the bearing and the turntable and the base, and the like.
 a) the level of the platform to generate an error
 The greatest impact on the platform level degree azimuth shaft accuracy, but once the platform leveling is complete, without considering the impact of the foundation deformation under the platform level degree in general does not change. After the system error levelness leveling platform manually generated can be controlled in γ 1.
 b) bearing end jump generated random error
 Bearing end jump to a, then the error is caused by:
 gamma 2 = A × 2.06 × 10 5 / L
 Wherein, L-- azimuth bearing raceway diameter.
 c) the bearing and the mounting accuracy of the system error generated turntable
 Parallelism of the turntable is mounted on a bearing plane is b, then the error is caused by:
 gamma 3 = B × 2.06 × 10 5 / L
 d) the bearing mounting accuracy of the system error and the base generated
 Error bearing seat mounting antenna mounting plane and the lower plane parallelism is c, then the cause is:
 gamma 4 = C × 2.06 × 10 5 / L
 (2) the error is not horizontal pitch axis
 The pitch axis is not horizontal pitch axis fluctuation error is an error with the pitch axis tilt error sum. In front elevation antenna during the rotation, the influence of the antenna base pitch axis orientation perpendicular to the axis of the main factors are: antenna base modification, a pitch bearing support unequal height, the pitch bearing diameter jump, the pitch bearing clearance and the like.
 a) an antenna system error caused by deformation of the receptacle
 Deformation height directly changes the antenna base of the antenna front ends of the fulcrum, the simulation analysis, the front ends support point load deformation caused due to the pitch axis error δ 1.
 b) the system error is not generated pitch contour of the bearing housing
 The antenna pedestal assembly process chock measured angle of inclination and the height difference, after finishing and polishing, left to stand without a controllable high H, the error is caused by:
 δ 2 = H × 2.06 × 10 5 / L '
 Wherein, L '- supported pitch span.
 c) the bearing diameter jump generated random error
 Runout bearing inner ring is d, the error is caused by:
 δ 3 = D × 2 × 2.06 × 10 5 / L '
 d) random errors resulting bearing clearance
 Auxiliary bearing radial clearance e, the error is caused by:
 δ 4 = E × 2.06 × 10 5 / 2L '.
 No vertical error (3) of the mechanical axis of the pitch axis
 Mechanical axis is not perpendicular to the pitch axis error by the antenna base portion and the two front antenna, where the antenna base is not horizontal pitch axis error δ 2 Around carrier formulations through an antenna height of the seat assembly process control. Parallelism of front and wavefront horizontal pitch axis in a vertical direction, i.e. the pitch axis and the unit mounting surface parallelism k 1 , Guaranteed by machining; dynamic flatness of wavefront errors under load k 2 Causing the mechanical front plane normal to the axis of the array is parallel to a negligible error.
 Electric axis to the mechanical axis comprises an azimuth accuracy of the calibration of the correction accuracy, the accuracy of calibration of the pitch, each of the factors as follows:
 (1) Calibration accuracy azimuth
 An azimuth error correction factors comprises: a telescope mounted perpendicular to the plane of the front surface of the front surface, the optical axis of the base platform with the bottom surface (mounting surface) of parallelism, the optical resolution and the like.
 a) telescope mounting system error wavefront and a plane perpendicular to the front surface of the resulting
 Verticality is f, then the error is caused by:
 zet 11 = Arctan (f / 400)
 b) the optical axis of the base platform bottom surface (mounting surface) Parallelism
 Parallelism is ζ 12.
 c) Optical resolution
 Optical resolution of the telescope itself ζ 13. Microscope using partition accurate to 0.1 mils, i.e. 21.6 ", the 0.1 mil or estimation CCD electronic control empirically reading error ζ 13 Inside, so that the optical resolution may be ζ 13 Calculate.
 d) Optical Calibration Error
 Calibration antenna tower from about the center plane D, calibration of a horn antenna and tower mounted a plate cursor, the cursor plate board width requirements:
 Di 光 ≥ (D × n) / 1000
 Wherein, n-- of each small grid points within the program range measurement by a minimum 0.1 mil.
 The cursor to the center of the antenna horn plate from the center of the X and Y axis are equal to the front telescope wavefront horizontal and vertical mechanical axis of the antenna distance, the distance error in the m, bringing the photoelectric Calibration error:
 zet 14 = (1000 × m) /D×0.06°
 (2) Calibration accuracy pitch
 Calibration factors pitch error comprising: positioning the telescope array plane perpendicular to the plane of the front surface and the optical axis parallel to the side of the base platform, optical resolution and the like.
 Systematic error a) positioning the telescope to the front surface of the plane perpendicular to the plane of the array generated
 Verticality is f, then the error is caused by:
 zet 21 = Arctan (f / 400)
 b) with an optical axis parallel to the side of the base platform
 Parallelism is ζ 22.
 c) Optical resolution
 Optical resolution ζ 23.
 d) Optical Calibration Error
 Optical Calibration error:
 zet 24 = (1000 × m) /D×0.06°
 2. Accuracy dispensing structure
 Factors influencing the structure of the antenna angle measurement accuracy mainly comprises front surface accuracy, precision shafting static error antenna base, fixed base and load deformation and dynamic error correction standard error of four parts. Each includes a static error accuracy error and dynamic error, wherein the error by a fixed and static error (systematic error) and random error components. After the above-described structural factors affecting the accuracy of error analysis, the accuracy of dispensing a block diagram showing the structure see figure 2 , Each structural precision index distribution shown in Table 1 to Table 6.
 Table 1 Structure Array precision dispensing face
 Front Precision Error Distribution (MM) Error type Processing assembly error Δ 1
 Table 2-axis orientation degree of precision geodetic vertical distribution
 Table 3 degree pitch axis of the dispensing accuracy of the vertical azimuth axis
 Table 4 squareness precision dispensing mechanical axis of the pitch axis
 Table 5 Calibration accuracy azimuth distribution
 Table 6 Accuracy distribution pitch Calibration
 The antenna system pointing accuracy error calculation
 Antenna pointing accuracy error antenna base including precision shafting static error, the fixed base and load deformation and dynamic error correction standard error of three parts. When calculating the axial antenna base accuracy error, the error is integrated into each of the three factors axis error, and then by a summary of three axis error mean square root. According to the calculation, is not perpendicular to the azimuth axis error gamma] to the earth, the pitch axis is not perpendicular to the azimuth error δ axis is not perpendicular to the mechanical axis of the pitch axis error k, values taken by the non-orthogonal three-axis side and the roots (referred to as RMS ). Antenna system according to the calculated static angle measurement error caused by accuracy error, subsequent infrastructure uneven settlement, temperature, wind load, etc. even dynamic errors also affect the accuracy of the angle measurement error. Due to the dynamic error on the accuracy of the azimuth shaft shafting also affect the accuracy of the pitch error, the influence is not independent, it can not find the dynamic error and root square shaft with other factors resulting accuracy error shaft. In this case the need for a separate monitoring device for recording and computing the dynamic error caused by the azimuth error ΔE 动 And pitch angle errors ΔA 动 , And then three axis error and root with the demand side.
 Combined with precision bearing shaft Alignment Precision ζ 1 Pitch Calibration accuracy ζ 2 , Respectively to obtain the azimuth, elevation angle measurement error. The antenna system azimuth and elevation angle measurement errors were always:
 Calculated based on the antenna system pointing accuracy error process, such as by image 3 The antenna system accuracy error of the mechanical axis of the tool shown aided design, calculated in real time and shows the mechanical axis of the antenna system according to the precision error of respective error factors. Antenna system mechanical axis accuracy error affects the default of the recommended value, and can perform structural modular assembly according to different antenna systems, and the parameterization input is implemented corresponding to each influencing factors, and the mechanical axis accuracy calculation results provide visualization interactive environment.
 4. The accuracy of measurement and calibration structure
 Theodolite systems and dual utilization industrial photogrammetry system (or a laser tracker), the development of geodetic embodiment, detection may be accomplished axis orthogonal antenna array surface gravity deformation detecting antenna system and so on.
 (1) perpendicular to the axis of orientation
 In addition to the geodetic methods, levels of calibration antenna base tape may be employed as the electronic horizon or level of engagement was measured.
 (2) perpendicular to the pitch axis and the azimuth axis detection
 The method may be obtained geodetic azimuth axis L 1 And the pitch axis L 2 Analyzed spatial angle, azimuth axis and the spatial distance can be obtained as [tau] is the pitch axis, the pitch axis perpendicular to the axis of the azimuth error δ. In addition to the geodetic methods, antenna base assembly and testing process also measurable pitch axis perpendicular to the azimuth axis error, wherein the high class in the v-axis, the spindle head in the rotational angle θ.
 (3) mechanical axis perpendicular to the axis of the pitch
 The geodetic methods can be obtained pitch axis L 2 And the front surface normal L 3 Analyze the spatial angle between the mechanical axis and the pitch axis to obtain the vertical error to be k. In addition to the mechanical axis parallel to the optical axis, the vertical axis mechanical error and the pitch axis may be calibrated by a transition axis and the pitch axis by fitting satisfied.
 (4) the antenna plane of wavefront detection
 Planar surface of the antenna array detection antenna is required front elevation from 0 ° to 90 °, in the process according to the measured interval sequentially 15 °. Finally, front-fit plane according to the coordinate points measured for each state to obtain a plane front of different pitch angle of the antenna.
 (5) electrical measurement axis and mechanical axis consistency
 Electrical axis of the antenna should coincide with the mechanical axis of the antenna, but if the electrical axis perpendicular to the mechanical axis can not be detected directly, it is generally mounted with the surface of the optical telescope in the array of pitch rotation. First optical axis of the telescope to be adjusted parallel to the mechanical axis, then the same electric axis with the optical axis is adjusted, so that the electrical axis coincides with the mechanical axis on the optical axis from the transition effect.
 Many specific details are set forth in the above description to fully understand the present invention. However, the above description is merely preferred embodiments of the present invention, and the present invention can be implemented in many different fails thereof, and thus the present invention is not limited by the specific implementation disclosed above. Any of the technical solutions and techniques of the present invention may be utilized by those skilled in the art without departing from the scope of the invention. example. Any simple modification, equivalent change, and modification of the above embodiments are still within the scope of the technical solutions of the present invention, according to the technical solutions of the present invention, in accordance with the technical solution of the present invention.
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