179 results about "Interferometric imaging" patented technology

The invention relates to the technical field of optics, in particular to a gas concentration regulation and control interference imaging system applied to shape righting of a nozzle handle, a shape righting tool and a nozzle are prepared, the shape righting tool is provided with a downward pressing mechanism, the downward pressing mechanism is provided with a downward pressing telescopic column for correcting the nozzle handle, and a displacement measurement interferometer system is assembled on the shape righting tool; the displacement measurement interferometer system is provided with a reflecting movable mirror and a beam splitter, and the reflecting movable mirror is mounted on the pressing telescopic column; the displacement measurement interferometer system further comprises an interference light path stroke difference fine tuning system. The interference light path stroke difference fine adjustment system comprises a glass container for containing sulfur hexafluoride, the end faces of the two ends of the glass container are flat and transparent, the glass container is arranged on a light path between the beam splitter and the reflective moving mirror, and the end faces of the two ends of the glass container are perpendicular to laser on the light path; the glass container is provided with an air supply port; the air supply port is connected to an air pump, and the air pump is connected with a sulfur hexafluoride air source. And the shape correcting position of the nozzle handle is accurately controlled.

The wafer detection system comprises a first PL channel, a second PL channel, a BF channel and a DF channel which are used for scanning a wafer to be detected at the same time, and the first PL channel and the second PL channel adopt light sources with the same wavelength for illumination and imaging. The BF channel and the DF channel adopt light sources with wavelengths different from those of the first PL channel and the second PL channel for illumination and imaging, a dichroscope assembly is used for integrating light paths, a differential interference imaging mode is adopted for imaging, PL is photoluminescence, BF is a bright field, and DF is a dark field. According to the invention, the BF channel, the DF channel and the PL channel are fused, two PL channels are used, four detection channels are provided, the detection efficiency is high, multiple channels are fused, and the wafer only needs to be scanned once to cope with different types of defects at the same time.

The invention relates to the technical field of large-aperture telescope construction, in particular to a large-aperture spliced telescope progressive generation method, which comprises the following steps of S1, constructing a local co-phase region at the edge of a large-aperture telescope by using spliced sub-mirrors through assistance of a small-aperture secondary mirror, and forming local co-phase imaging capability; s2, the step S1 is repeated, and equal-area local co-phase regions are constructed at the symmetrical positions of the edge of the large-aperture telescope; s3, constructing an interference imaging system through optical path difference adjustment, zero interference elimination and two symmetrical local co-phase regions; s4, repeating the steps S1 to S3, constructing more symmetrical and equal-area local co-phase regions at the edge of the large-aperture telescope, and constructing interference imaging in which the plurality of symmetrical local co-phase regions participate; and S5, constructing local co-phase regions in sequence from the edge to the center until the construction of the whole large-aperture telescope is completed.

This invention discloses a particle morphology recognition method based on YOLOv7 and interferometric imaging technology. The method uses an interferometric particle imaging system to obtain interferometric defocused images of a mixed particle field to create a dataset. The annotated interferometric defocused images are divided into training, validation, and test sets. The network is then improved by incorporating a collaborative attention module to enhance detection accuracy. Hyperparameters are adjusted, and training and testing are performed using the annotated dataset. After 200 epochs of training, the optimal weights are obtained, ultimately achieving mixed particle field morphology recognition. This method can achieve high-precision identification of particle morphology in mixed particle fields, providing technical support for acquiring cloud particle field information.

Provided herein are various enhancements for processing interference fringe data produced by optical interferometry and producing images from such interference fringe data. One example implementation includes a method comprising producing an interference fringe image by interfering multispectral optical signals of a scene supplied by optical collection devices. The method includes transforming the interference fringe image into a frequency domain representation comprising spectral channels corresponding to interfered combinations among the multispectral optical signals, determining pathlength errors of beam paths associated with the optical collection devices by concurrently processing the spectral channels of the frequency domain representation, and removing the pathlength errors in the frequency domain representation to produce a corrected frequency domain representation. The method also includes constructing a corrected image of the scene from visibility samples arising from the corrected frequency domain representation.

This invention relates to the field of optical imaging and detection technology, specifically providing a broadband snapshot-type polarization interferometry imaging detection system and method for breast tumors. A broadband light source illuminates a breast tumor tissue sample. The reflected signal light is collected and collimated by a pre-optical system, then sequentially passes through a first and a second ray shaping unit for two shearing and two polarization state transformations, resulting in two beams of linearly polarized light and two beams of circularly polarized light. These beams are imaged by an imaging lens to an area array detector to obtain a polarization interferogram, which is then demodulated to obtain all Stokes parameters of the breast tumor tissue sample. This invention achieves broadband snapshot imaging of breast tumors with all Stokes parameters without using an analyzer, doubling the light throughput compared to traditional polarization imaging instruments using analyzers. Furthermore, this invention has advantages such as compact structure, no moving parts, easy assembly and adjustment, and no need for image registration.

The invention relates to the technical field of film defect detection, and discloses a film defect detection system based on differential interference imaging technology, comprising: a frame provided with a transmission module for transmitting a film to be detected; the visual detection module is arranged in the rack and is used for carrying out defect detection on the thin film in the conveying process; the visual detection module comprises a differential interference visual detection unit, a lighting unit and an adjusting unit. According to the thin film defect detection system based on the differential interference imaging technology, the angles of the differential interference visual detection unit and the illumination unit can be synchronously adjusted, illumination treatment can be performed on a thin film in real time, and bending treatment can be performed on the thin film to be detected; further, defects on the surface of the thin film are deformed or displaced under the action of bending stress, and the defect exposure effect is enhanced; and real-time detection of the film in different bending states is carried out in cooperation with the differential interference visual detection unit.

The invention belongs to the technical field of photon integrated interference imaging, and particularly relates to a reconstructed image quality evaluation method based on a sparse reconstruction model. Comprising the following steps: S1, calculating frequency sampling points of each pairing baseline; s2, calculating the size of the reconstructed image; s3, adjusting the size of the original image; s4, generating a frequency domain mask based on the frequency sampling points of the paired baselines obtained in the step S1; s5, updating the frequency spectrum of the reconstructed image by using the frequency domain mask; s6, Fourier transform is carried out on the updated reconstructed image frequency spectrum, and a reconstructed image is obtained; s7, calculating a transverse gradient and a longitudinal gradient of the reconstructed image; s8, calculating a transverse gradient and a longitudinal gradient of the original image; s9, calculating a gradient root-mean-square error of the reconstructed image and the original image; and S10, evaluating the image quality of the reconstructed image based on the gradient root-mean-square error. The method provides powerful guidance for system design and reconstructed image quality.

The invention relates to a dot matrix auxiliary focusing digital holographic microscope system and a holographic reconstruction method, the system comprises a digital holographic microscopy light path part and a dot matrix auxiliary focusing light path part, the digital holographic microscopy light path part adopts polarization modulated narrow-band laser to irradiate an object sample to be measured to become object light; the reference light which is orthogonal with the polarization reflected by the reference mirror is subjected to interference imaging in the polarization camera, so that different phase shift acquisition of a single image is realized; the dot matrix auxiliary focusing light path part calculates the focus position of the object sample to be measured by using the definition of the image, and the optimal inverse diffraction distance required in the digital holographic reconstruction process can be directly obtained. Compared with the prior art, the method has the advantages that the automatic focusing efficiency of the digital holographic microscope is improved, the digital holographic three-dimensional surface reconstruction speed is greatly increased, and the reconstruction efficiency and real-time performance are improved on the premise that the reconstruction measurement precision is guaranteed.

The invention relates to the technical field of wafer detection, and discloses a multi-channel visual imaging device and a wafer defect detection system. The device comprises a light source assembly, a differential interference imaging assembly, a dark field imaging assembly, an inclined imaging assembly and a photoluminescence imaging assembly. The light source assembly is used for generating linearly polarized light; the differential interference imaging assembly is used for splitting the linearly polarized light and converging the linearly polarized light to a wafer to be detected, so that two light beams returned from the wafer to be detected interfere with each other and form a corresponding optical image; the dark field imaging assembly is used for collecting light beams deviated and scattered from the to-be-detected wafer and forming corresponding optical images; the inclined imaging assembly is used for irradiating the irradiation light beam to a to-be-detected wafer at a certain angle, collecting the light beam reflected from the to-be-detected wafer and forming a corresponding optical image; and the photoluminescence imaging assembly is used for filtering the light beams generating the fluorescence effect on the wafer to be detected, collecting the filtered light beams and forming a corresponding optical image. According to the embodiment of the invention, the integration level of the visual imaging device can be improved.

The invention relates to the technical field of automatic optical detection, and discloses a product appearance defect identification method and system based on multi-modal imaging, and the method comprises the steps: obtaining interference imaging, polarization imaging and scattering imaging data sequences at multiple moments, extracting an instantaneous phase and an instantaneous frequency at each moment by utilizing Hilbert transform, and generating a time sequence phase-frequency characteristic image set; processing interference fringe data at each moment based on a phase unwrapping algorithm, and outputting a time sequence phase evolution matrix; learning an interlayer phase propagation rule by using a space-time diagram convolutional network, and generating hierarchical defect evolution representation; and predicting a spatio-temporal evolution trajectory of the defect through four-dimensional gradient calculation, and outputting a four-dimensional morphological parameter and a development trend of the defect. Through a deep coupling mechanism of a multi-scale phase evolution kernel function and a space-time diagram network, the limitation that spatial distribution and time evolution of phase information cannot be processed at the same time in a traditional method is overcome.

The present invention belongs to a parasitic image correction method. In order to solve the current method of using a dimming film to block the parasitic image to reduce the influence of the parasitic image on the imaging quality, which will reduce the energy utilization rate, and it is difficult to meet the technical problem of high energy and high signal-to-noise ratio requirements when using a large-aperture spatiotemporal joint interference imaging spectrometer to obtain target information, a parasitic image correction method for a large-aperture spatiotemporal joint modulation interference imaging spectrometer is provided. Through the energy position relationship between a laser point and its corresponding parasitic image, the reflection center, reflection coefficient and parasitic image range of the interference imaging spectrometer can be accurately determined, so that the interference imaging spectrometer can accurately locate the parasitic image of its image. Then, the parasitic image correction can be completed by removing the corresponding parasitic image in the image, which provides a new idea for the parasitic image correction of the interference imaging spectrometer.

The present invention discloses an X-ray grating imaging method based on a bidirectional staggered absorption grating. The present invention belongs to the technical field of X-ray phase contrast imaging. A bidirectional staggered absorption grating is used to arrange an X-ray grating interference imaging device, and an X-ray two-dimensional intensity image is obtained; the X-ray two-dimensional intensity image is extracted by combining the nine-square grid neighbor term approximation method with the Fourier analysis method, and three images of X-ray absorption contrast, differential phase contrast and dark field contrast are extracted; the contrast image is processed by an image post-processing algorithm based on pixel value similarity to improve the image quality. The present invention does not require moving the grating, and a variety of contrast images can be obtained under one exposure, which greatly reduces the imaging time, reduces the imaging dose, and improves the imaging efficiency and stability of the system. In addition, the method of the present invention has little effect on the spatial resolution, can reduce the structural stripes caused by the staggered grating in the contrast image, and can maximize the image quality.

The application relates to an online monitoring device and method for microelectrodes, and belongs to the technical field of special machining.The online monitoring device is composed of a coaxial holographic imaging module, an LED backlight imaging module, a motion control module, an image acquisition card, a laser power controller and an LED brightness controller.The LED backlight imaging module is used for positioning the microelectrode image; the coaxial holographic imaging module is used for holographic interference imaging of the microelectrode; based on a holographic reconstruction algorithm, electrode profile information is obtained, and the electrode loss degree is judged.The coaxial holographic imaging module and the LED backlight imaging module switch the positions of the reflecting mirrors through the motion control module to realize control of different imaging modes; the collected images are input into a PC through the image acquisition card, image algorithm analysis is carried out, and the microelectrode loss degree is judged.The application realizes online monitoring of the microelectrode loss.

The present invention relates to an interference spectral imaging restoration method and system based on degradation simulation, and belongs to the technical field of remote sensing image processing. In the degradation modeling calibration, the degradation elements in the interference imaging are divided into trend items and noise, and the degradation process is modeled into three stages: instrument degradation, photosensitivity degradation, and signal-independent degradation. The interference imaging degradation model and the corresponding model calibration method are used to extract the degradation characteristics and model parameters of each stage for a specific instrument, generate corresponding calibration results, and use them to generate highly realistic interference data. In the restoration process, a multi-stage restoration algorithm framework is constructed to process the trend items, transformation calculations and other elements and noise in the degradation process separately. At the same time, a multi-stage simulation data set generation method is designed, which can generate a high-fidelity simulation interference pattern data set dedicated to training the entire algorithm from the spectral data set according to the calibration results. The present invention achieves more efficient and better-effective interference imaging restoration.

The invention relates to an interference imaging device for phase feedback compensation quasi-real-time calibration, and belongs to the technical field of interference imaging. The calibration device comprises an X / Y direction light path, a controller and a linear displacement table. The X-direction light path structure and the Y-direction light path structure are the same, and each of the X-direction light path structure and the Y-direction light path structure comprises two parallel coupling lenses, an interference assembly and a photoelectric detection assembly which are sequentially arranged in the light incidence direction; the linear displacement table is cross-shaped; four paths of coupling lenses of the X-direction light path and the Y-direction light path are fixed through a linear displacement table and are uniformly arranged around the central point of the cross-shaped linear displacement table; the interference assembly receives the light beams output by the two parallel coupling lenses, performs phase modulation on the light beams, enables the two light beams to perform interference, and outputs an interference light signal to the photoelectric detection assembly; the photoelectric detection assembly converts the interference optical signal into an interference electric signal; the controller is used for sending a control signal to the interference assembly to control phase modulation of the interference assembly and receiving an interference electric signal output by the photoelectric detection assembly.

A composite material gas cylinder layering defect displacement prediction method based on deep learning and laser shearing speckle interference comprises the following steps: constructing a training data set combining simulation data and experimental data, generating the simulation data based on a shearing speckle interference imaging principle, and combining the experimental data acquired by an experiment to predict the layering defect displacement of a composite material gas cylinder. Constructing a mixed data set containing a wrapped phase diagram and an out-of-plane displacement diagram; constructing a deep convolutional neural network fused with an attention mechanism, and extracting displacement features from high-frequency stripes: starting from an input layer, sequentially connecting an encoder path, a bottleneck layer, a decoder path and an output layer; constructing a composite loss function and training the network, and constructing a composite loss function comprising a pixel-level error constraint and a gradient consistency constraint; and utilizing the trained deep learning neural network to predict out-of-plane displacement response at the layering defect of the gas cylinder. According to the method, the problems of image distortion, data missing and the like caused by a traditional phase unwrapping algorithm are effectively solved, and the out-of-plane displacement field can be accurately, smoothly and continuously reconstructed.

The invention relates to the technical field of optical interference imaging, in particular to a high-resolution image fusion method based on a one-dimensional sparse aperture rotating pupil. Comprising the following steps: inputting a target image, imaging the target image by adopting a one-dimensional sparse aperture rotation pupil, and obtaining one image when the target image is rotated to an angle; performing non-subsampled contourlet transform to obtain a low-frequency image and a high-frequency image corresponding to each image; performing equal-weight superposition and normalization on the plurality of low-frequency images and the plurality of high-frequency images; repeating the steps to construct a data set; establishing a double-branch residual fusion network; through a residual learning strategy, high-frequency branch detail information is extracted, and global linear transformation is carried out on the low-frequency image; and fusing the residual image of the high-frequency branch and the adjusted low-frequency image, and outputting a final high-resolution image. The method has the advantages that effective information is accurately extracted, a data set required by training is simplified, full-spectrum coverage is obtained through fewer sub-apertures, and an imaging effect equivalent to a larger aperture is achieved.

The invention discloses a digital differential interference imaging method, and belongs to the technical field of optical imaging and microscopic imaging. The method comprises the steps that bright field illumination is used, a first image and a second image are collected at defocus positions which are vertically symmetrical on a sample focal plane respectively, and the defocus distance is larger than the physical depth of field of an objective lens; and carrying out pixel-level gray value subtraction on the two images to obtain a digital differential phase image. Digital image processing is adopted to replace optical shearing and interference of a traditional DIC, a polarized optical element and a special DIC prism are not needed, the system cost and complexity are remarkably reduced, the system can be compatible with non-standard optical material sample containers such as a plastic culture dish, and the directional shadow problem of the traditional DIC is solved. Meanwhile, by providing two specific implementation modes, namely accurate positioning acquisition and automatic focusing fusion acquisition, the imaging efficiency and the system robustness are further improved on the basis of ensuring the high contrast and the pseudo three-dimensional relief imaging effect.

The application discloses a spaceborne near-space horizontal two-dimensional wind field interferometer based on a ring-shaped field of view and a full-link simulation method, the imaging instrument comprises an optical system, a detector and a data processing unit, the optical system comprises, in sequence along an optical path, a front cone mirror, a field of view diaphragm, a collimating lens group, a Fabry-Perot interferometer, a narrow-band filter assembly and an imaging lens; and the application improves the time-space resolution of instrument detection.

This invention discloses a deep-ultraviolet nanosecond-gated Raman and LIBS detection system and method for suspended soil particulate matter nutrients, belonging to the field of optical and smart agriculture sensor technology. The system includes: a laser ejection sampling unit for in-situ soil ablation to generate aerosols; an optical tweezers unit for capturing and suspending individual soil particles; a deep-ultraviolet laser excitation unit for emitting nanosecond dual-pulse lasers to excite the same particle to generate Raman and LIBS signals; a spatial heterodyne spectral interferometry imaging unit for slitless, high-throughput coaxial signal collection and the formation of interference fringes; and a timing control unit for time-division multiplexing detection of Raman and LIBS signals through nanosecond gating. This invention eliminates matrix effects and achieves highly sensitive in-situ, non-destructive, and synergistic detection of atomic and molecular information in single soil particles. Furthermore, Raman and LIBS are used to distinguish the organic content and total composition of nitrogen, phosphorus, and potassium, enabling precise quantification of soil nutrients.

This invention relates to the field of safety monitoring and disaster early warning technology for deep underground engineering, and discloses an intelligent rockburst dynamic risk prediction method integrating real-time microseismic data. This method first constructs a high-precision medium model reflecting the real-time stress and attenuation characteristics of the rock mass based on background noise interferometric imaging and the adjoint state method inversion. Then, it reconstructs a four-dimensional energy density field, defines and calculates the waveguide locking index to accurately screen key energy localization regions. Subsequently, it extracts the energy residual sequence of the key regions, calculates the lag first-order autocorrelation coefficient and time-domain variance, and uses the critical slowing theory to determine the precursors of system dynamic instability and trigger graded early warnings. This invention corrects imaging biases caused by energy dissipation through physics-driven medium parameter inversion, and combined with data-driven nonlinear dynamic analysis, achieves accurate spatiotemporal positioning of the rockburst incubation core area and early identification of disaster risks.

This invention relates to the field of remote sensing satellite orbit control technology, and discloses a satellite autonomous pipeline control method based on differential interferometric SAR imaging missions. The method includes: acquiring initial satellite orbit parameters; employing a multi-objective optimization algorithm for orbit optimization under a high-order gravity field; sampling and constructing a reference orbit point set; calculating orbit control deviations based on the actual orbit and the reference orbit; generating orbit control triggering rules and avoidance strategies through ground system simulation; executing orbit control strategy generation and control onboard system; and evaluating orbit control effectiveness and the evolution trend of orbit control deviations through the ground system. Existing technologies mainly rely on ground command injection, making it difficult for satellites to achieve efficient autonomous orbit control when performing heavy-orbit differential interferometric SAR imaging missions, and hindering the decoupling of orbit control and imaging tasks. This invention improves the efficiency and autonomy of orbit control, the execution efficiency of imaging missions, and the safety of on-orbit operation by constructing a closed-loop control system encompassing satellite-ground collaboration, strategy formulation, command execution, and effect evaluation.

The present application relates to the field of spectral imaging, and especially to a ridge stepped Fabry-Perot interferometric imaging spectrometer, comprising a scanning mirror, a telescope objective, a Fabry-Perot array interference system and a detection system, the scanning mirror is located on the object focal plane of the telescope objective, and performs lateral push scanning on a target light field; the telescope objective adopts an image far field optical path structure, and is used for collecting the target light field and imaging the target light field in an FP resonant cavity of the Fabry-Perot array interference system; the Fabry-Perot array interference system is located on the image focal plane of the telescope objective, and comprises parallel plates and a ridge stepped mirror, the step height of the ridge stepped mirror is in a decreasing distribution from the middle to both sides; the detection system is located in the exit direction of the Fabry-Perot array interference system, and is used for imaging the interference light field modulated by the Fabry-Perot array interference system to obtain an interference image array. The present application has the advantages of small volume, light weight, compact structure, static state, stability, reliability and the like.

The present invention belongs to the field of photon integrated interference imaging technology, and in particular, relates to a method for evaluating the reconstructed image quality of a photon integrated interference imaging system. The method comprises: S1: calculating the discrete modulation transfer function of the photon integrated interference imaging system according to the parameters of the photon integrated interference imaging system; S2: acquiring the original image using the photon integrated interference imaging system to obtain a reconstructed image; S3: performing multi-resolution decomposition of the original image and the reconstructed image in turn using a Gaussian pyramid to obtain an original image group and a reconstructed image group; S4: calculating the mutual information of the images with the same resolution contained in the original image group and the reconstructed image group; S5: evaluating the image quality of the photon integrated interference imaging system according to the calculation results of step S1 and step S4. The present invention objectively evaluates the reconstructed image quality of the photon integrated interference imaging system based on two measurements, spatial domain and frequency domain, to make up for the lack of evaluation in a single dimension.

The invention discloses a sea surface height inspection equipment layout method based on an interference imaging altimeter, which belongs to the technical field of altimeter inspection, is used for sea surface height inspection equipment layout, and comprises the following steps: obtaining position data of a Glider buoy and temperature-salinity-depth data of a profile observed by the Glider buoy, putting the Glider buoy and a GNSS buoy in the same area at the same time before a satellite passes, and putting the GNSS buoy in the same area at the same time; the synchronous observation of the GNSS and the Glider buoy is realized; and carrying out position positioning when the Glider buoy descends and ascends to outcrop, carrying out matching with a grid position in a swath range observed by a satellite, and carrying out sea surface height inversion according to temperature-salinity-depth data of a section obtained through observation of the Glider buoy. The method adapts to data characteristics of different resolutions of the interference imaging altimeter, sea surface height synchronous observation of satellite data with different spatial resolutions under satellite transit is realized, and calibration inspection of the altimeter satellite is accurately completed.

Systems and methods for static and dynamic calibration may also be used to provide alignment of a measurement beam from an interference imaging (CI) measurement system with respect to a processing beam from a material processing system. In these systems and methods, the calibration measurement output may be obtained from the CI measurement system and / or an auxiliary sensor. Future measurements performed by the CI measurement system may be modified at least partially based on the calibration measurement output.

The present invention relates to the field of photon integrated interference imaging technology, and in particular to a sparse image reconstruction method based on non-uniform Fourier transform. It includes: S1: calculating the frequency sampling point coordinates of the photon integrated interference imaging system according to the baseline configuration and baseline pairing method of the photon integrated interference imaging system: S2: calculating the size of the reconstructed image; S3: constructing a non-uniform Fourier transform matrix for calculating the reconstructed image; S4: calculating the reconstructed image according to the non-uniform Fourier transform matrix; S5: rearranging the reconstructed image from a one-dimensional column matrix to a two-dimensional column matrix according to the size of the reconstructed image to obtain the final reconstructed image. The present invention can accurately describe the sampling frequency of the photon integrated interference imaging system and effectively improve the quality of image reconstruction.

The invention relates to the technical field of photon integrated interference imaging, in particular to a sparse image reconstruction method based on non-uniform Fourier transform. Comprising the following steps: S1, calculating frequency sampling point coordinates of the photon integrated interference imaging system according to baseline configuration and a baseline pairing mode of the photon integrated interference imaging system; S2, calculating the size of a reconstructed image; s3, constructing a non-uniform Fourier transform matrix used for calculating the reconstructed image; s4, calculating a reconstructed image according to the non-uniform Fourier transform matrix; and S5, rearranging the reconstructed image from the one-dimensional column matrix to the two-dimensional column matrix according to the size of the reconstructed image to obtain a final reconstructed image. According to the method, the sampling frequency of the photon integrated interference imaging system can be accurately described, and the quality of image reconstruction is effectively improved.

The invention belongs to the field of airborne interference imaging altimeter error correction, and particularly relates to a platform and baseline error correction method based on an airborne interference imaging altimeter, which comprises the following steps of: acquiring a height measurement data sequence X1 continuously acquired along a flight path; preprocessing the X1 to obtain a preprocessed data matrix X2; performing empirical orthogonal function decomposition on the X2 along the rail direction, and extracting a spatial mode, a time coefficient and a characteristic value; determining a main characteristic mode according to a variance contribution rate corresponding to the characteristic value; identifying and separating a platform error component, a baseline error component and a real height signal component by combining distribution characteristics of a space mode and a time coefficient; and reconstructing a real height signal based on a separation result to realize comprehensive correction of a platform error and a baseline error. According to the method, the platform error and the baseline error which are different from real signals in space-time characteristics are effectively separated through EOF decomposition, and the height measurement precision of the airborne interference imaging altimeter is remarkably improved.