monopulse radar calibration

Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. 2002-0059136 (published on July 12, 2002), a pilot signal is sampled at a predetermined frequency in a radar system, and the pilot signal is converted into a digital signal, and the computer then analyzes the gain characteristic and phase offset But it has a limitation that it can not correct the error due to deterioration, while it can provide correction for the initial offset. {\displaystyle \psi } The proposed program addresses our approach for (1) making the necessary calibration measurements during pre-mission checkout, (2) updating candidate parameterized polarization models using the calibration measurements, and (3) extracting the depolarization corrections from the model using a simple algorithm. .css('display', 'flex') Here, the monopulse table is a set of data in which target information according to the intensity of the beam is recorded. Published under licence by IOP Publishing Ltd [4] The following mathematical derivation should make it clear why this is so. 10. If both targets have the same elevation or . A pulse-type radar is assumed and, The statistical prediction of monopulse angle measurement where the amplitude fluctuation law of the signal source is unknown and multiple observations are available is presented. The primary sensing radar (PSR), which is implemented as a monopulse radar, has an antenna composed of four feed horns, and uses the beam intensity received by each of the four feed horns to calculate the target azimuth, Obtain information. RIS. Monopulse radar angle estimation requires data to be received simultaneously in two receive channels. Accurate calibration of amplitude and phase inconsistency is a necessary condition for radar . Especially in the case of military radar and aircraft, it is not necessary to provide location information to the enemy, but rather to conceal possible information. Therefore, a monopulse processor functions by first detecting and measuring the target signal on the sum channel. The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. In this case, conceptually identical to the elevation case, the azimuth mapping of the radar scattering location is generally perpendicular to earth's gravity for an aircraft platform flying straight and level. School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China. BibTeX , ; 1 , , 2 , , 3 , , 1 , , 1 , . 3 and 4 show an example of the error between the primary target information and the secondary target information. The weight vector is a combination of a steering vector that steers the beam in a steered direction, = Volume 2290, Thus, Secondary surveillance radar (SSR) first transmits a batch inquiry signal to all targets, and when a response signal supporting S mode (Mode S) is confirmed among the response signals returned from the target, SS mode And transmits an individual question signal to the target that receives the ADS-B. This article describes the design, analysis, and performance prediction of a monopulse pointing system in a 34-m beam-waveguide antenna of the Deep Space Network (DSN) to minimize pointing loss, maximize amplitude stability, and track very low-SNR signals from a very distant spacecraft with a well-predicted trajectory. .css('font-weight', '700') Those skilled in the art will also appreciate that numerous changes and modifications could be made to the embodiment described herein without departing in any way from the invention. Accurate calibration of amplitude and phase inconsistency is a necessary condition for radar system to track the measurement target accurately. In fact, for many systems a linear approximation is good enough. Therefore, in order to match the primary target information with the secondary target information, it is preferable to convert the altitude information and the position information included in the secondary target information into altitude information and azimuth information, respectively, for matching. , that "flips" this vector. Accordingly, the primary target information acquired by the primary monitoring radar (PSR) includes the elevation information and the azimuth information while the secondary monitoring radar (SSR) acquires the altitude information using the C mode (Mode C) S mode (Mode S) is used to acquire position information. This allows angular measurement to be performed using a single receive pulse. The method incorporates adaptive moment estimation to resist noise in the iteration process of the alignment. {\displaystyle {\frac {N-1}{2}}} Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. .css('display', 'inline-block') simultaneous lobing, Monopulse radar, i.e. In monopulse practice, this is what is actually done. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). In a radar system, a monopulse calibration table is constructed from live targets of opportunity. It can send and receive a beam once and detect the distance, azimuth and elevation angle of the target simultaneously Means a radar. The root mean squared error of the alignment of the proposed method is 0.0046 degree in the absence of noise. ) = 2 Calibration for Variable Polarimetric Monopulse Radar to Improve Transmitting Polarization Purity Abstract: In this paper, a calibration method for the variable polarimetric monopulse radar is proposed to increase the transmitting polarization purity. subscript and instead use only The trajectory correlator 130 analyzes and compares the transformed secondary target information with the primary target information to determine whether the targets that are the closest to each other among the targets analyzed in the primary target information and the targets analyzed in the secondary target information (S18). a Calibration is an effective method for improving digital monopulse radar tracking performance since it can eliminate the amplitude-phase imbalance between channels. We can define the beam pattern (array factor) of a uniform linear array (ULA) with N elements, as:[5]. We can clearly see now that the beam pattern, in Calibration is an effective method for improving digital monopulse radar tracking performance since it can eliminate the amplitude-phase imbalance between channels. [2], In phase-comparison monopulse, typically an array is subdivided into sub-arrays, and then a "sum" and a "difference" or "del" channel are formed. To solve this problem, a new angle estimation approach is proposed. {\displaystyle a_{n}={\frac {1}{N}}} IEEE Transactions on Aerospace and Electronic Systems, The problem of estimation of angle of arrival in amplitude comparison monopulse (ACM) radars in the presence of internally generated thermal noise is considered. According to another aspect of the present invention, there is provided an error correction method for a radar system including a primary sensing radar and a secondary monitoring radar, the method comprising: And a step of irradiating a beam of the waveform with the intensity of the beam reflected on at least one target by substituting the previously stored primary target information according to the intensity of the beam into a pre-stored monopulse table, Obtaining primary target information for the target; Driving the secondary surveillance radar to transmit a query signal to the at least one target and analyzing response signals received at each of the at least one target to obtain secondary target information for each of the at least one target ; Receiving the secondary target information and matching the primary target information to the primary monitoring radar; Obtaining a correction value using an error value between the primary target information and the secondary target information matched by the primary monitoring radar; And correcting an error of the primary surveillance radar by reflecting the correction value to the monopulse table by the primary surveillance radar; . Monopulse radar is a radar system that uses additional encoding of the radio signal to provide accurate directional information. The del channel is formed simply by subtracting these same subarray outputs. Therefore, if an error occurs in the detection performance due to deterioration, It does not provide a way to detect or correct the error. 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Conversely, should a non-linear component of the data warrant it, a non-linear fit can also be used. Fast and accurate alignment between the antenna under test and the probe is an important part of the calibration. The data is generated from a channel 604, while the data is generated from a channel 606. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. {\displaystyle \psi _{S}} 7. 2290 012056 FIG. For stabilized antennas, aircraft roll is decoupled from the antenna system, preserving the elevation and azimuth references for aircraft maneuvers within the limits of the stabilization system. n Korean Unexamined Patent Publication No. Similarly, the monopulse antenna can also be used in azimuth. Increasing the accuracy of the primary surveillance radar (PSR) is needed to adaptively cope with various surveillance environments. The signal transmission / reception period can be set to be long, and the possibility of deterioration is considerably lower than that of the primary monitoring radar (PSR). J = *, jQuery(document).ready(function($){ Semantic Scholar is a free, AI-powered research tool for scientific literature, based at the Allen Institute for AI. 1 A precision-guided hypersonic projectile weapon system. This channel to the compensation of side lobes always has practically his own small antenna and has a very wide antenna diagram and also serves for the reconnaissance of active jamming. A method as described in claim 4 wherein said monopulse antenna is used in azimuth, said azimuth mapping said radar scattering location generally perpendicular to earth's gravity. The transmission / reception unit 110 emits a pulse signal of a predetermined pattern as a beam, and receives the reflected beam on the target. a ] Least square fit 614 uses the ratios computed in 612 for a plurality of aligned pixels and corresponding aligned pixels over the radar scattering location to identify a line that crosses the Monopulse Angle=0 line. It is a little tricky to configure until you get the hang of it but it is worth the wait in the long run. Two monopulse ratios are formed just as with a linear array, each one indicating the deviation angle in one dimension from the center of the beam.[3]. Monopulse processing is done entirely with the received signal in the array manifold and beam forming network. In radar system, the amplitude-phase inconsistency of receiver's sum and difference channels will lead to the decrease of sensitivity of angle measurement, the decrease of angle measurement accuracy which will eventually lead to the instability of . {\displaystyle \psi ={\frac {2\pi }{\lambda }}dcos\theta } The trajectory associating unit 130 receives the primary target information, which is the target information detected by the target detecting unit 120, and the secondary target information, which is the target information acquired from the secondary surveillance radar (SSR) The corresponding secondary target information is discriminated and matched with each other. Calibration method for monopulse radar system, Application filed by , RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES, Systems using the reflection or reradiation of radio waves, e.g. Read more about this topic: Monopulse Radar, Description, Monopulse Basics. System for locating at least one RFID tag in space, in particular in an indoor environment, and related method. 1 shows a monopulse radar system in accordance with an embodiment of the present invention. The monopulse ratio is formed by dividing the imaginary part of the del channel by the real part of the sum channel. All these signals need an own receiver channel. This study presents a closed-form solution to resolve the directions of arrival of two unresolved targets using a single snapshot of four independent channels in phase comparison monopulse radar. .css('padding', '15px 5px') Referring to FIG. N The monopulse correction unit 140 may obtain a correction value for correcting the monopulse table by statistically processing error values for a plurality of different targets. 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Wherein matching the primary target information comprises: receiving the secondary target information from the secondary monitoring radar; Determining target information for the same target in each of the primary target information and the secondary target information for each of the at least one target; And matching the primary target information and the secondary target information for the same target with each other; And a control unit. {\displaystyle {\vec {v}}_{\psi }\left(\psi \right)} {\displaystyle a_{n}={\frac {1}{N}}} ( 1, a method of correcting the monopulse radar system of FIG. To find out more, see our, Browse more than 100 science journal titles, Read the very best research published in IOP journals, Read open access proceedings from science conferences worldwide, Published under licence by IOP Publishing Ltd, Max Planck Zentrum fr Physik und Medizin, Max Planck Institute for the Science of Light, Master stipends and funded PhD positions within the IMPRS School of Physics and Medicine, Master stipends and funded PhD positions within the IMPRS Physics of Light, BAE Systems Applied Intelligence 2023 Engineering & Physics Graduate Programme, Copyright 2022 IOP Before performing monopulse processing, a system must first detect a target, which it does as normal using the sum channel. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members. simultaneous lobing with means specially adapted to maintain the same processing characteristics between the monopulse signals, Combinations of radar systems, e.g. The reason that the monopulse correction unit 140 corrects the monopulse table based on the secondary target information is not only that the possibility of deterioration in the secondary monitoring radar SSR is very low and that the secondary target information is a primary target Because it provides more accurate target information relative to the information. Only individual radar bins exactly over the corresponding disdrometers locations are considered for comparison. Request PDF | On Sep 20, 2020, Binbin Zhang and others published Calibration for Variable Polarimetric Monopulse Radar to Improve Transmitting Polarization Purity | Find, read and cite all the . : Conf. The name refers to its ability to extract range and direction from a single signal pulse. Of course, if the array is 2-dimensional, such as a planar array, there are two del channels, one for elevation and one for azimuth, and therefore two monopulse ratios are formed. Calibration method for monopulse radar system Download PDF Info Publication number KR101461131B1 . Citation Yu Zheng et al 2022 J. . It is an object of the present invention to provide a correction method of a monopulse radar system capable of detecting and correcting an error of a detection performance in real time on the spot even if deterioration of the detection performance occurs. N {\displaystyle \Delta } Here, a radar system is deriving a correction for an actual boresight of a radar monopulse antenna 602 mounted on a moving platform from data and data generated with respect to a calibrated boresight of the monopulse antenna. The ground positioning measuring system reports a position and velocity of the monopulse antenna with respect to a reference. Meanwhile, the secondary surveillance radar SSR determines whether the target supports the S mode (Mode S) (S15). Although presented in exemplary fashion employing specific embodiments, the disclosed structures are not intended to be so limited. The monopulse techniques use radar antenna signals from an object using two antennas or channels, which are commonly referred to as SUM and DIFFERENCE (or "DIFF") channels, as is known in the. A compute ratio / 612, typically implemented in a computer, forms a ratio of the aligned a pixels to the aligned pixels for each of a plurality of aligned pixels located near the calibrated boresight. However, altitude information is information about the altitude of the target, which needs to be converted to elevation information that the primary surveillance radar (PSR) perceives for the same target. The proposed program addresses our approach for (1) making the necessary calibration measurements during pre-mission checkout, (2) updating candidate parameterized polarization models using the calibration measurements, and (3) extracting the depolarization corrections from the model using a simple algorithm. The difference or "del" pattern can easily be inferred from the sum pattern simply by flipping the sign of the weights for the second half of the array: Again assuming that That is, an average of error values between the primary target information and the secondary target information analyzed during a predetermined time can be obtained, and the correction value can be calculated using the obtained average error value. If the target supports the S mode (Mode S), the secondary surveillance radar SSR acquires the position information which is the ADS-B information using the S mode (Mode S) (S16). Wherein the step of matching the primary target information comprises converting the altitude information included in the secondary target information into a form corresponding to the high angle information of the primary target information after receiving the secondary target information, Converting the primary target information into a form corresponding to the azimuth information of the primary target information when the secondary target information includes the position information; And further comprising: And the converting step converts the secondary target information into a form corresponding to the primary target information by reflecting the error due to the propagation refraction effect. Assuming that N is even (we could just as easily develop this using an odd N),[6], If we assume that the weight matrix is also conjugate symmetric (a good assumption), then, and the sum beam pattern can be rewritten as:[7]. is simply the phase shift between adjacent elements. Export citation and abstract Amplitude comparison monopulse systems encounter the target resolution problem when multiple targets occupy the same range-azimuth cell. When the targets of the primary target information and the secondary target information are matched, the mono pulse correction unit 140 calculates an error value between the matched primary target information and the secondary target information, It is determined whether the error range is exceeded (S19). Based on the distance between the radars and the disdrometers, we link the Cranfield and . Primary surveillance radar (PSR) is a monopulse radar that emits a beam, analyzes the beam reflected on the target, searches for a target against a pre-established monopulse table, and includes elevation and azimuth information of the searched target Primary target information is acquired (S12). The projectile is then launched and guided in flight along the trajectory to the target. I a , . The synthetic aperture map is formed from a plurality of data, while the synthetic aperture map formed from a plurality of data, as shown in FIG. A method as described in claim 4 wherein said monopulse antenna is used in elevation, said elevation mapping said radar scattering location generally aligned with earth's gravity. Figures 3 and 4 show only the difference in elevation angle between the primary target information and the secondary target information. Also, the error value for at least one target may be statistically processed in a predetermined time interval unit (for example, 10 minutes) to obtain a correction value. .css('color', '#1b1e29') Traductions en contexte de "rseau d'antennes radar" en franais-anglais avec Reverso Context : procd et rseau d'antennes radar impulsion. 1, the radar system of the present invention includes a primary surveillance radar (PSR) and a secondary surveillance radar (SSR). That is, compute ratio /. And a control unit. Meanwhile, in order to prevent interference due to signal superposition due to a plurality of targets returning a response signal at the same time in response to a question signal transmitted by a secondary surveillance radar (SSR), a recently used secondary radar (SSR) It supports the S mode (Mode S) in which a one-to-one data link is constructed for each target to send and receive a question signal and a response signal. First, only one beam is formed. 2 As described above, since the target detection unit 120 obtains the primary target information with reference to the monopulse table, when the monopulse table is corrected, the primary target information is corrected. -space, is the spatial equivalent of the discrete time Fourier transform (DTFT) of the array amplitude tapering vector times a linear phase term. Let us now assume an un-tapered, normalized array with Off bore sight angles (OBA) of the target are then determined from the target's actual azimuth. 4 is a diagram illustrating the difference between the primary target information and the corresponding high- The error value is analyzed to have an average of -0.2291 degrees. Therefore, when the altitude information is converted into the elevation information, the monopulse table is corrected using the elevation information whose error due to the propagation refraction is corrected. = For a planar array, one sum channel is formed as the sum of the outputs of all four quadrants, but two del channels are formed, one for the elevation dimension and one for the orthogonal azimuth dimension. N When used in elevation, the elevation mapping of the radar scattering location is generally aligned with earth's gravity for an aircraft platform flying straight and level. Instead, the SSR transmits the query signal to the target, . with the understanding that it represents the deviation of the steered target phase and the actual target phase. 3 should be displayed as a straight line, but it is actually detected with a deviation as shown. .css('color', '#1b1e29') The present invention in a method for calibrating an error of a radar system, which includes primary and secondary surveillance radars, includes: a step of operating the primary surveillance radar and radiating a pulse wave-shaped beam, substituting a pre-stored monopulse table which have recorded primary target information depending on the intensity of the beam with the intensity of the beam reflected by at least one target, and receiving the primary target information for each the targets; a step of operating the secondary surveillance radar, transmitting an inquiry signal to the target, and obtaining secondary target information of each of the target by analyzing the response signal received at the target; a step that the primary surveillance radar receives the secondary target information and matches the secondary target information with the primary target information; a step of obtaining a calibrated value using an error between the primary target information which the primary surveillance radar is matched with and the secondary target information; and a step that the primary surveillance radar calibrates an error of the primary surveillance radar by reflecting the error to the monopulse table. This ratio gives an error signal that indicates to a high degree of accuracy the actual target angle as compared to the center of the beam. Phase-comparison monopulse is a technique used in radio frequency (RF) applications such as radar and direction finding to accurately estimate the direction of arrival of a signal from the phase difference of the signal measured on two (or more) separated antennas [1] or more typically from displaced phase centers of an array antenna. Since the typical 15-minute pre-mission checkout is not adequate for full calibration, there is a need for a model that can be updated using limited pre-mission checkout data. Let us now develop the monopulse "difference" or "del" pattern by dividing the array into two equal halves called subarrays. A method as described in claim 2 wherein said plurality of said data forming said synthetic aperture map is a 512 by 512 matrix centered with respect to said calibrated boresight, and wherein said analysis of said ratio is computed for 20 by 20 said aligned pixels around said calibrated boresight to identify said actual boresight. e Top notch radar detector. {\displaystyle {\textbf {J}}} , Rohde & Schwarz GmbH & Co. Kommanditgesellschaft, The United States Of America As Represented By The Secretary Of The Navy, Alma Mater Studiorum - Universita' Di Bologna, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ALON, YAIR;JACOBS, MARK;REEL/FRAME:018214/0215, NORTHROP GRUMMAN SYSTEMS CORPORATION, CALIFORNIA, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NORTHROP GRUMMAN CORPORATION;REEL/FRAME:025597/0505, PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY, Using radar targets of opportunity to build a monopulse carlibration table, Method for determining measurement of deviation of axis of beam of electronic scanning antenna radar, involves iterating resolution of system of vectorial equations and couple of measurement corresponding to pointing values, Method for angular focusing of signals in scanning radar systems, Rfid and robots for multichannel shopping, Method and Device for Estimating Direction of Arrival, METHOD FOR MEASURING SECONDARY RADAR ANTENNA DIAGRAMS AND SECONDARY RADAR USING SUCH A METHOD. n {\displaystyle \psi } The calibration method of monopulse slope to minimize the variation of angle estimate in frequency agile noncoherent monopulse system is proposed and the measured average monop Pulse slope within the frequency bandwidth is -0.96, the maximum variation of angles is similar to theoretical value, at azimuth and at Azimuth. Unlike the primary surveillance radar (PSR), the secondary surveillance radar (SSR) does not detect the target and acquire the target information. Monopulse is resistant to jamming which is one of the main reasons it is used in most radar systems today. however, the narrow beam and high gain of a millimetre-wave band . primary radar systems; Analogous systems, Systems determining position data of a target, Simultaneous measurement of distance and other co-ordinates, Monopulse radar, i.e. j The reader is left to show that At this time, the beam radiated from the primary radar (PSR) and reflected on the target may be refracted by generating a propagating refraction effect depending on the state of the medium. ) The operation of the secondary surveillance radar (SSR) is very unlikely to cause deterioration compared to the primary surveillance radar (PSR) that transmits and receives the beam in a manner similar to a communication system. c The primary surveillance radar (PSR) that emits the beam and detects the target is difficult to acquire information such as the type of target and flight altitude. , and. In the illustrative application, the projectile is a . .css('font-size', '16px'); In other words, primary target information can be acquired by lowering the elevation angle of the primary surveillance radar (PSR) to -032291 degrees, which is an average error value, than before. Traduction Context Correcteur Synonymes Conjugaison. A method for calibrating a monopulse radar system is provided. The radar receiver acquires SAR data 608 from a synthetic aperture map of a radar scattering location using the channel of the monopulse antenna, and a synthetic aperture map of the same radar scattering location using the channel of said monopulse antenna. 11. simultaneous lobing with means for eliminating radar-dependent errors in angle measurements, e.g. however, the narrow beam and high gain of a millimetre-wave band antenna pose a challenge to the alignment. Especially, in the case of azimuth and elevation angle, the radar antenna is installed in the precision measurement facility and the detection performance is corrected using the information measured in the measurement facility. However, targets detected in the sidelines of a system, if not mitigated, will produce erroneous results regardless. . Method and apparatus for electrically scanning an antenna array in a monopulse DF radar system US4313117; From an antenna array of a plurality of fixed, narrow beamwidth antennas, geographically oriented to provide omnidirectional coverage, first and second sets of antennas are selected in sequence. The trajectory associating unit 130 may convert the secondary target information corresponding to the primary target information so as to match the primary target information and the secondary target information. In the radar system of the present invention shown in FIG. Wherein the obtaining of the correction value comprises: determining whether the number of error values exceeding the reference error range exceeds a predetermined number; Wherein the step of calculating the correction value acquires the correction value using the average of the plurality of error values. The mean and the, By clicking accept or continuing to use the site, you agree to the terms outlined in our. The trajectory correlator 130 receives the primary target information corresponding to the secondary target information obtained in the secondary surveillance radar (SSR) among the primary target information for at least one target detected in the primary surveillance radar (PSR) Acquire and associate with each other. .css('background', '#FBD04A') The target detection unit 120 determines the intensity of the beams received through each of the four feed horns of the transmission / reception unit 110, and obtains the target information by comparing the intensity of the determined beam with the predetermined monopulse table. The monopulse antenna (602) is coupled to a ground position measuring system (616) while acquiring data. 6. Thus, the primary surveillance radar (PSR) can correct the primary surveillance radar (PSR) by applying an average error value to the elevation angle to the monopulse table. A radar as described in claim 10 wherein said monopulse antenna is used in elevation, said elevation mapping said radar scattering location generally aligned with earth's gravity. A calibration method based on satellite calibration for amplitude-phase inconsistency of beam waveguide antenna pulse measurement radar uses joint estimation of elevation and cross-elevation channels, which has high calibration accuracy, strong applicability and is easy to implement in engineering. A method for estimating an actual boresight of a radar monopulse antenna mounted on a moving platform from data and data generated with respect to a calibrated boresight of said monopulse antenna, said data generated from a channel, said data generated from a channel, said monopulse antenna coupled to a ground position measuring system, said ground positioning measuring system reporting a position of said monopulse antenna with respect to a reference and a velocity with respect to said reference, said method comprising the steps of: 2. First, we compare the radar-calibrated Z DR measurements by the two approaches described in the previous sections at the disdrometer locations. In radar system, the amplitude-phase inconsistency of. 1 The inventive system includes a first subsystem for determining a target location and providing data with respect thereto. S The primary surveillance radar (PSR) according to an embodiment of the present invention includes a signal transceiver 110, a target detector 120, a trace associating unit 130, And a monopulse correcting unit 140. The target detection unit 120 analyzes the beam received by the transmission / reception unit 110 to acquire target information including a target distance, an azimuth angle, and an elevation angle. Wherein the acquiring of the correction value comprises: determining whether an error value between the primary target information and the secondary target information exceeds a predetermined reference error range; And calculating the correction value by converting the error value into a preset method if the error value exceeds the reference error value range. To try out the new user experience, visit the beta website at