38 results about "Quadratic phase" patented technology

The invention relates to a single-channel moving target refocusing method and device based on a bunching mode, and the method comprises the steps: detecting a ground moving scene through a terahertz video radar, obtaining a single-channel echo signal, generating a two-dimensional image of the ground moving scene, and extracting a target image of a moving target from the two-dimensional image; the method comprises the following steps of: performing azimuth inverse Fourier transform on a target image to obtain a one-dimensional range image, performing secondary phase compensation by using an image displacement algorithm, and performing range envelope alignment on a compensated signal by using an adjacent cross-correlation algorithm of linear interpolation to correct a nonlinear error term so as to obtain a moving target refocusing image after the nonlinear error term is corrected. And the two-dimensional image is filled with the image to obtain a complete image. By adopting the method, the problem of image defocusing caused by micro-distance migration can be effectively solved.

The invention discloses a far-field imaging system, a metasurface grating and an imaging terminal, and relates to the technical field of image generation. Dynamic environment compensation and imaging quality optimization are realized through cooperation of multiple modules of the system: the environment temperature is read in real time, the refractive index of the metasurface grating is corrected according to a pre-stored mapping relation, and a target wavefront function is constructed and dispersed to obtain an initial phase distribution matrix; dividing a focusing area in combination with a user sight line, and compensating and regulating a phase distribution matrix by voltage gradient; based on the divided buffer and background regions, a multi-region sampling rate is configured to generate a mask, and the collection efficiency of the key region is improved; monitoring far-field information change in real time, and selecting an interpolation or total variation strategy to update the image; by means of image definition feedback, a secondary phase correction term is superposed to optimize a phase distribution matrix; the problems of traditional far-field imaging in the aspects of environment adaptation, dynamic focusing, data acquisition and imaging quality are solved, and the method is suitable for augmented reality glasses and the like.

The invention relates to the technical field of holography, in particular to a color hologram generation method based on an approximate secondary phase mask. The method comprises the following steps: constructing an approximate secondary phase; extracting an optimized approximate secondary phase mask from a spatial domain or a frequency domain according to the approximate secondary phase; and decomposing a target image into RGB three-channel amplitudes, and combining the optimized approximate secondary phase mask with the three-channel amplitudes to obtain a color hologram. According to the method, the calculation efficiency can be improved, a hybrid optimization strategy is provided, a high-quality initial phase is quickly generated through an approximate secondary phase mask, the phase distribution is refined by combining limited GS iteration (10-30 times), the single frame generation time is compressed to be within 5 seconds, the efficiency is improved by more than 50% compared with that of a traditional GS algorithm, high-frequency noise is inhibited through regular phase distribution, and the calculation efficiency is improved. The phase uniformity is improved in combination with double-domain optimization, so that the PSNR value of the reconstructed image exceeds 28dB, the SSIM value exceeds 0.9, and the noise power is reduced by more than 30% compared with a random phase method.

The present application relates to a kind of Hartmann wavefront measurement dynamic range extension method based on quadratic phase control, belong to wavefront measurement technical field.For the problem that the measurable slope interval is limited in the limited detection displacement range in traditional Hartmann wavefront measurement, at least the sub-aperture phase distribution containing reference focusing phase and quadratic phase term is constructed in super surface phase control, and the displacement of each sub-aperture corresponding light spot on the detection surface and the local average slope of the sub-aperture satisfy the preset monotone reversible nonlinear mapping relationship in design working interval by combining theoretical modeling, numerical optimization and / or experimental calibration.The present application can reconstruct the slope-displacement encoding rule of traditional Hartmann under the premise of keeping local average slope reversible and wavefront reconstructable, extend the encodable slope range in given displacement range, so as to improve the dynamic range of Hartmann wavefront measurement, especially suitable for the measurement scene of strong non-uniform, large dynamic range wavefront.

The invention discloses a large-view-field polarization detection super lens based on an instrument matrix, and relates to the technical field of micro-nano optics and polarization detection. Comprising four sub-lens structures. A secondary phase distribution and global optimal phase screening strategy is adopted in the structural design, and a calibration method based on an instrument matrix is provided. According to the structure, different polarization components are spatially separated and focused, and polarization response of a system at different incident angles is accurately calibrated by using an instrument matrix, so that polarization detection in a large view field range of 120 degrees is realized. The invention has the characteristics of super compactness and high precision, and can be used for designing polarization detection, polarization imaging and the like in a large view field range.

This application relates to a method, device, and apparatus for estimating parameters of ground moving targets based on shadows. The method constructs a geometric model for imaging moving targets using terahertz video SAR (terahertz SAR) in a spotlight mode, and based on this geometric model, obtains a mathematical model of the moving target's echo. After representing the echo signal obtained by detecting a ground moving scene using the terahertz video SAR using this mathematical model, the method estimates the target's range velocity by the relative offset between the target image and the shadow in azimuth, estimates the target's azimuth velocity by frequency broadening between the target image and the shadow in azimuth, and estimates the target's range acceleration by compensating for the quadratic phase and modulating the quadratic phase frequency. This method enables accurate target parameter estimation.

This invention proposes a low-noise holographic 3D display method based on a fractional Fourier transform algorithm. The method includes the following steps: First, setting the signal and noise intervals of the recorded object to obtain a preprocessed image RD(X,Y); Second, superimposing the image RD(X,Y) with a quadratic phase generator to produce a corresponding complex amplitude distribution D0(X,Y) on the object plane; then, performing a fractional Fourier transform based on the complex amplitude distribution D0(X,Y) on the object plane to obtain a complex amplitude distribution D1(X,Y) on the holographic plane; extracting the phase information of D1(X,Y) and... The complex amplitude distribution D2(X,Y) of the object plane is obtained through fractional-order inverse Fourier transform. A double constraint of amplitude and second-order phase is applied to the signal interval of D2(X,Y) to obtain the complex amplitude distribution D3(X,Y) of the object plane, completing the first iteration. The complex amplitude distribution D3(X,Y) is then used to replace D0(X,Y) to start the next loop, continuing until the phase converges to the optimal solution. In the third step, the phase distribution of the optimal solution is extracted to generate a pure phase hologram. By superimposing pure phase holograms of different depths, the final pure phase hologram of the 3D object is obtained. Low-noise holographic 3D display is achieved by illuminating the pure phase hologram of the 3D object with coherent light.

The invention discloses a single-coil multi-layer parallel magnetic resonance imaging method based on multiple excitation in a low field, and the method comprises the steps: achieving the multi-layer parallel excitation through a multi-band pulse, and carrying out the 0-pi phase modulation of the multi-band pulse; constructing a fast spin echo sequence of secondary phase modulation; performing imaging by using the fast spin echo sequence subjected to secondary phase modulation; and reconstruction is carried out through an odd-even echo classification method, and a scanning result graph is obtained. Aiming at the common problem of low signal to noise ratio of low-field magnetic resonance imaging in practical application, based on hardware characteristics of a single coil of low-field magnetic resonance equipment and actual requirements of repeated scanning, a series of SMS related technologies such as an FSE fast spin echo sequence, Hadamard pulse coding, multi-band pulse and secondary phase modulation are combined; and the signal-to-noise ratio of the low-field FSE sequence is effectively improved.

The present invention discloses a double-layer metasurface wide-angle imaging lens with quadratic phase modulation and monochromatic aberration elimination. The double-layer wide-angle imaging lens comprises: a substrate L1, a nano-cylinder array structure layer M1 arranged on the upper surface of L1, and a nano-cylinder array structure layer M2 on the lower surface. M1 is established according to the binary optical surface 2 formula of ZEMAX and has the function of correcting spherical aberration; M2 is modulated by the quadratic phase formula and can eliminate the coma generated after the angled light source is incident and focused. When the imaging lens is working, the angled light source is incident from the dielectric cylinder array structure layer on the top surface of the substrate, passes through L1 and M2, and focuses the light onto the sensor. The present invention uses a nano-cylinder array structure layer, which can be used to focus incident light at a large angle, and can minimize the volume and weight of the system, thereby improving the practical application effect of the imaging lens.

The invention provides a performance evaluation method and device for non-line-of-sight free space quantum key distribution, and belongs to the technical field of quantum communication and free space optical communication, and the method comprises the steps: constructing a three-dimensional light beam propagation model which comprises light beam drift, light beam broadening and light spot distortion caused by light beam diffraction and atmospheric turbulence; the method comprises the following steps: generating random turbulent flow phase distribution based on a sparse spectrum phase screen method, carrying out numerical simulation on a laser transmission process in combination with a step-by-step propagation algorithm, obtaining a transmissivity sample sequence in which geometric mismatch loss and a turbulent flow fading coupling effect are jointly considered under linear phase shift and secondary phase shift design, and further constructing end-to-end transmissivity probability distribution; and performing weighted evaluation on the key rate of the discrete variable and continuous variable quantum key distribution protocol by using the transmissivity probability distribution to avoid channel fluctuation distortion. The method is suitable for parameters of different turbulence intensities, wavelengths, receiving apertures and channel lengths, and can provide a basis for design and optimization of a non-line-of-sight quantum communication link.

The invention belongs to the technical field of interference direction finding, and relates to a broadband high-precision quadratic correlation interferometer direction finding method based on an FPGA. The method comprises the following steps: carrying out first phase correlation calculation by adopting an FPGA parallel calculation mode; performing second phase correlation calculation; performing quadric surface fitting on a curved surface formed by extending in the horizontal direction and the pitching direction; traversing all sample angles, calculating a matrix coefficient required by quadric surface fitting and an inverse matrix of a matrix, and storing a result in a BRAM (Block Random Access Memory) of the FPGA; solving a quadric surface coefficient to obtain a surface equation; and calculating a final horizontal angle and a final pitch angle according to the extreme points of the curved surface equation. According to the invention, quadratic fitting of the curved surface is realized in the FPGA based on a result storage mode, so that the direction finding precision of the correlation interferometer is improved; the phase correlation calculation and resource overhead of the direction finding of the primary correlation interferometer are obviously reduced, and the bandwidth performance and the real-time performance of direction finding are ensured while the direction finding precision is effectively improved.

The present invention relates to a time delay estimation method based on quadratic correlation optimal weighting. By constructing an array signal based on the quadratic correlation function and a steering vector based on frequency and time delay, an optimal weight vector is obtained using a constrained optimization method. The optimal weight vector is used to perform optimal weighting on the time delay search to obtain the time delay difference between any two signals. The time delay estimation method combining quadratic correlation and optimal weight vector beamforming time delay estimation of the present invention improves the time delay estimation accuracy under low signal-to-noise ratio conditions; quadratic correlation can effectively suppress noise, and the optimal weight vector time delay estimation can greatly improve the time delay estimation accuracy without upsampling. The combination of the two points can effectively improve the time delay estimation accuracy under low signal-to-noise ratio conditions.

The invention provides a satellite-borne SAR (Synthetic Aperture Radar) real-time imaging method based on an embedded GPU (Graphics Processing Unit), which comprises the following steps of: dividing obtained echo data into a plurality of sub-aperture signals in an azimuth direction through main equipment, and distributing the sub-aperture signals to different node equipment; each node device performs Doppler center compensation on the received sub-aperture signals to obtain a plurality of compensated sub-aperture signals, and performs range unit migration correction and range pulse compression processing on each compensated sub-aperture signal to obtain a plurality of sub-aperture signals subjected to range direction processing; the hyperbolic phase in each sub-aperture signal after range processing is replaced by a standard quadratic phase function through a phase conversion function to obtain a plurality of replaced sub-aperture signals, azimuth inverse Fourier transform is carried out on the sub-aperture signals, and a result is sent to the main device; and the main device performs coherent splicing on the images to obtain full-aperture image data, so that a non-aliasing full-aperture image is obtained, the single-machine processing pressure can be reduced, and the real-time performance is improved.

The application discloses a GEO SAR time-varying ionosphere error compensation method based on maximum contrast self-focusing, and belongs to the technical field of GEO SAR (Geosynchronous Earth Orbit Synthetic Aperture Radar). The method selects distance line signals from a GEO SAR image, the distance line signals are the signals with the same distance time in the azimuth direction, the average power of each distance line signal in the image is calculated, a part of the distance line signals are selected, then the contrast of the SAR image is used to iteratively estimate the quadratic phase error coefficient, the cubic phase error coefficient is iteratively estimated based on the quadratic phase error coefficient, and finally the obtained quadratic and cubic phase error coefficients are used for phase compensation of the original SAR image, so that the SAR image affected by the time-varying ionosphere is accurately compensated. Experiments prove that the contrast of the compensated SAR image is improved by the method, and the compensated image is good, and is close to the image not affected by the time-varying ionosphere.

A kind of shore-to-ship receiving high frequency ground wave radar group target distance domain resolution method, including the construction of shore-to-ship receiving HFSWR group target echo geometric model;From the time domain echo signal of shore-to-ship receiving sub-target, derive motion compensation factor and distance scaling factor;According to the radial velocity and radial acceleration estimated by minimum entropy criterion, establish the motion compensation factor expressed in phase;The estimated rotational angular velocity is obtained by using the quadratic coefficient estimation method based on the quadratic phase cancellation to estimate the quadratic coefficient;The motion compensation factor is used to motion compensation group target time domain echo signal to obtain the Doppler spectrum after removing ambiguity;The estimated rotational angular velocity is brought into the radial distance scaling factor, and the Doppler spectrum after removing ambiguity is converted from Doppler frequency to radial distance domain by the radial distance scaling factor, to realize the resolution of group target in distance domain.The present application solves the problem that HFSWR is difficult to distinguish group target, and improves the resolution ability of shore-to-ship receiving HFSWR group target in distance domain.

The present invention relates to the field of optical imaging technology, and specifically to a method for correcting chromatic aberration of a tomographic microscope, comprising the following steps: S1: adding a quadratic phase grating, a blazed grating, a reflector, and a tube lens to the imaging optical path of the microscope; wherein the blazed grating includes multiple parts corresponding to the diffraction orders of the quadratic phase grating; S2: placing the sample to be observed at the object-side focal plane of the microscope objective, and placing the quadratic phase grating at the image-side focal plane of the microscope objective; S3: incident light first passes through the microscope objective and then sequentially enters the quadratic phase grating, the blazed grating, the reflector, and the tube lens, and finally forms an image on a CCD detector; the light wave at the quadratic phase grating is split into three diffracted light waves and projected onto the upper, middle, and lower portions of the blazed grating, respectively, to achieve chromatic aberration correction through dispersion subtraction. The present invention has a simple structure, low manufacturing cost, good chromatic aberration correction effect, and high light wave projection energy.

The present invention relates to a three-point ranging method based on secondary denoising time-delay matching. By constructing an array signal based on a secondary correlation function and a steering vector based on frequency and time-delay, time-delay search is performed in a preset manner to obtain the time-delay difference between any one of the three array elements and the other two array elements, thereby obtaining the distance to the target. The beneficial effect of the present invention is that in the case of low signal-to-noise ratio, the secondary correlation function can effectively suppress noise, and the beamforming time-delay estimation can greatly improve the time-delay estimation accuracy without upsampling, thus improving the ranging accuracy.

The present disclosure relates to electronic devices with a quadratic phase generation circuit. An electronic device can include wireless circuitry. The wireless circuitry can include a quadratic phase generator for an outputting a full interpolated constant amplitude zero autocorrelation (CAZAC) sequence for a transmit path. The quadratic phase generator can include a numerically controlled oscillator, a switch controlled based on a value output from the numerically controlled oscillator, a first integrator stage, and a second integrator stage connected in series with the first integrator stage. The numerically controlled oscillator can receive a chirp count and a word length as inputs. The switch can be configured to switchably feed back one of two input values as a function of the chirp count and the word length to the first integrator stage. The quadratic phase generator can output a full bandwidth chirp or a reduced bandwidth chirp. Bandwidth reduction can be achieved by scaling the two input values of the switch.

The present invention discloses a far-field imaging system, a metasurface grating and an imaging terminal, and relates to the field of image generation technology. The system uses multiple modules to collaboratively realize dynamic environmental compensation and imaging quality optimization: the ambient temperature is read in real time, the refractive index of the metasurface grating is corrected according to a pre-stored mapping relationship, and a target wavefront function is constructed and discretized to obtain an initial phase distribution matrix; the focus area is divided in combination with the user's line of sight, and the phase distribution matrix is regulated by voltage gradient compensation; based on this, the buffer and background areas are divided, and a multi-area sampling rate is configured to generate a mask to improve the acquisition efficiency of key areas; far-field information changes are monitored in real time, and an interpolation or total variation strategy is selected to update the image; with the help of image clarity feedback, a quadratic phase correction term is superimposed to optimize the phase distribution matrix. The present invention solves the problems of traditional far-field imaging in environmental adaptation, dynamic focusing, data acquisition and imaging quality, and is suitable for augmented reality glasses, etc.

The invention discloses a coding aperture correlation holographic imaging method based on a single exposure point extended hologram, and relates to the field of computational optical imaging. According to the method, a conventional coding phase mask and a secondary phase are respectively modulated by using opposite linear phases to obtain an intensity image for simultaneously recording an object and an object hologram, then the intensity image is segmented to obtain the object and the object hologram, and finally the object and the object hologram are subjected to deconvolution to obtain a point expansion hologram for reconstruction. According to the method provided by the invention, the point expansion hologram can be obtained through single exposure, and the reconstruction quality of the interference-free coded aperture-related holography can be remarkably improved.

The invention discloses a stable image bias self-focusing method and device for a video SAR (Synthetic Aperture Radar), and the method comprises the steps: carrying out the inter-frame drift error modeling of an echo signal collected by the video SAR, and obtaining an echo signal containing a slope distance error and each frame of echo signal containing a phase error; forming a first signal sub-segment and a second signal sub-segment according to the echo signal containing the slope distance error; constructing an objective function according to the correlation between the first signal sub-segment and the second signal sub-segment; performing global optimization search based on the target function to obtain an optimal secondary phase error coefficient; constructing a motion error function of each frame of echo signal according to the optimal quadratic phase error coefficient; and performing inter-frame drift error compensation and defocusing phase compensation on each frame of echo signal containing the phase error according to the motion error function of each frame of echo signal to obtain each frame of compensated echo signal, and forming a video SAR image sequence. According to the invention, compensation of the inter-frame drift error of the video SAR image can be realized.

This application relates to a moving target refocusing method and device based on a single channel in a spotlight mode. This method generates a two-dimensional image of the ground motion scene based on a single-channel echo signal obtained by detecting the ground motion scene using a terahertz video radar. The target image of the moving target is extracted from this image. An inverse Fourier transform of the target image is performed in azimuth to obtain a one-dimensional range image. Quadratic phase compensation is performed using an image shift algorithm. The compensated signal is then aligned in range using a linear interpolation cross-correlation algorithm to correct for nonlinear error terms. This results in a refocused image of the moving target after the nonlinear error terms have been corrected, and this image is then patched back into the two-dimensional image to obtain a complete image. This method can effectively address the problem of image defocus caused by small range migrations.

The invention discloses a clutter Doppler sharpening method under range ambiguity of space-based double-station detection. The clutter Doppler sharpening method comprises the following steps: determining a squint angle change range in a beam detection area according to system parameters of a space-based double-station radar; dividing a beam detection area into a strong space-variant area and a weak space-variant area based on the squint angle variation range; constructing a partition compensation function for the strong space-variant region and the weak space-variant region to compensate the distance linear walking of the clutter signal to obtain a compensated clutter signal; fitting based on the compensated clutter signal to obtain a clutter equivalent energy center; and constructing a secondary phase compensation function by using the clutter equivalent energy center, and performing secondary phase compensation on the compensated clutter signal through the secondary phase compensation function. According to the clutter Doppler sharpening method, the compensation precision is high, compensation failure is avoided, and clutter energy diffusion caused by distance ambiguity component secondary phase compensation deviation can be avoided.

The invention discloses an ultra-high-speed target imaging method and system based on double-step frequency phase cancellation. According to the method, the characteristic that two groups of stepping frequency signals with different repetition periods can be converted to a frequency domain on a slow time axis is utilized, and the stepping frequency signals are combined with a phase cancellation operator constructed by the frequency domain, so that a primary phase term and a secondary phase term caused by motion can be eliminated on the premise of keeping system parameters consistent; meanwhile, sampling envelope walking under the high-speed condition can be effectively restrained, so that stable correction is still achieved under the high-speed scene, the energy focusing capacity is improved, and the high-performance imaging method based on the frequency domain phase cancellation technology is obtained. According to the method, range image offset, image waveform divergence and sampling envelope walking can be effectively inhibited under the condition of ultra-high-speed motion, the speed application range of double-pulse-group stepping frequency imaging is expanded, and the target imaging focusing performance and the positioning precision are improved.

The present invention belongs to the field of lasers and discloses an on-chip tunable femtosecond light source based on an integrated electro-optical frequency comb. The light source comprises an intensity modulator (9), a first phase modulator (10) and a second phase modulator (11) which are integrated on the same chip and connected in sequence. Three radio frequency drive signals provide radio frequency drive signals to the intensity modulator, the first phase modulator and the second phase modulator respectively. The intensity modulator modulates the intensity of a wavelength-tunable continuous optical signal to generate a flat-top optical pulse sequence. The first phase modulator and the second phase modulator are used to perform quadratic phase modulation on the flat-top optical pulse sequence to generate a broadband electro-optical frequency comb. A dispersive optical fiber is used to perform pulse compression on the electro-optical frequency comb to generate femtosecond optical pulses. Compared with existing femtosecond pulse light source generation systems, the present invention has the advantages of simple structure, high integration, tunable pulse width and repetition frequency, and low cost.

There is described a system for determining a modal property of a quantum state. The system generally has a quantum light source generating an optical pulse having a given frequency, a pulse time duration and a quantum state with a modal property; a local pulse generator having: a laser source generating a local optical signal having a frequency associated to the given frequency; an optical modulator modulating the local optical signal; and an arbitrary wave generator supplying electrical waveforms to the optical modulator for said modulating, said modulating including forming local optical pulses from the local optical signal, the local optical pulses being distributed within the pulse time duration; and a homodyne detector optically coupled to the quantum light source and to the local pulse generator for performing two-time correlation measurements being indicative of the modal property of the quantum state of the given optical pulse.

The present invention relates to the field of optical microcavity sensing technology, and particularly to a method for recovering the output spectral distortion caused by fast linear frequency modulation continuous wave; by introducing a spectral recovery algorithm with phase compensation, any distorted readout spectrum can be restored to its steady-state spectrum. Thanks to the long photon lifetime and photon localization characteristics, optical microcavities have become a promising high-performance sensing tool. By proposing that the ringing effect originates from the quadratic phase of the interference between the light emitted from the microcavity and the input / output of the waveguide, this quadratic phase depends on the chirp rate of the input linear frequency modulation continuous wave and is independent of the type of microcavity. After compensating for the introduced phase, any steady-state spectrum can be restored from the distorted readout spectrum, bridging the gap between the transient ringing spectrum and the steady-state spectrum, and opening up a new path for high-speed sensing, optical communication, and advanced integrated chip technology.

An apparatus, system, and method for a hologram recording system include a recording medium, a light source, and optical elements. The recording medium is configured to record a hologram. At least one light source is configured to provide a writing beam. The optical elements are positioned in a light path of the writing beam and are configured to condition the writing beam to record the hologram at least partially in the volume. The optical elements may include at least one toric optical element and a mirror. The toric optical element may be configured to subtract a quadratic phase from a wavefront of the writing beam, and the mirror may be configured to subtract a linear phase from the wavefront of the writing beam.

The invention provides an ISAC sequence generation method, device and equipment and a readable storage medium, and relates to the technical field of communication, and the method comprises the steps: determining a signal sequence length of target precision based on the combined demands of communication and perception performance indexes in an ISAC scene; determining a first positive integer and a second positive integer based on the signal sequence length; constructing a secondary phase sequence in a negative index form; calculating a fuzzy function to obtain a target fuzzy function; and carrying out structural characteristic test on the target fuzzy function, and if a preset characteristic requirement is met, determining that the secondary phase sequence is an ISAC signal sequence. According to the method, a secondary phase sequence in a negative exponential form is constructed through specific integer combination, and then a target ambiguity function with concentrated main peaks and suppressed side lobes is realized through point-by-point minimization optimization of the ambiguity function. According to the method, the resolution performance and the non-interference characteristic of signals in the ISAC system can be effectively improved, it is ensured that the generated sequence meets high-precision perception, meanwhile, the communication reliability is considered, and good engineering applicability and robustness are achieved.

The application discloses an unmanned aerial vehicle ISAR imaging method based on improved PGCPF parameter estimation, and relates to the technical field of inverse synthetic aperture radar imaging. The method comprises the following steps: performing distance compression, slant compensation and translational compensation on received echo signals to obtain processed data; performing reconstruction on the processed data through a weighted PGCPF optimization algorithm based on differential evolution to obtain reconstructed signals; and finally performing two-dimensional ISAR imaging on the reconstructed signals. The application introduces a weight factor in a PGCPF estimation multi-component linear frequency modulated (LFM) signal method, improves the accuracy of estimated quadratic phase term and linear phase term coefficients, reduces error accumulation in subsequent estimation, and optimizes parameter selection in the estimation process through a differential evolution algorithm. The application takes the ISAR image entropy as an evaluation function, finds the best parameter combination, and obtains the optimal echo signal. The reconstructed echo signal of the estimated multi-component linear frequency modulated signal can effectively improve the imaging effect of a rotor unmanned aerial vehicle in non-stationary motion and improve the imaging quality.