580 results about "Frequency shift" patented technology

The invention provides an intelligent optical cable performance prediction method and system for a data center, and relates to the technical field of data center performance analys.The intelligent optical cable performance prediction method comprises the steps that firstly, an optical cable microstructure disturbance quantization model is constructed, and an optical cable is divided into a plurality of virtual quantization units in the longitudinal direction; each unit packages a real-time stress-strain state parameter and a response sensitivity coefficient of the basic structure unit, inputting a Brillouin scattering spectrum frequency shift data flow collected in real time into the model for disturbance source analysis, generating a physical excitation decomposition sequence, driving a virtual quantization unit to perform state evolution iterative operation according to the physical excitation decomposition sequence, and obtaining a Brillouin scattering spectrum frequency shift data flow model; a stress-strain state evolution track set is obtained, a time-space correlation network of optical cable link disturbance propagation is constructed according to the stress-strain state evolution track set, network flow characteristic analysis is conducted on the time-space correlation network, an early warning node set is extracted, the future evolution trend of the early warning node set is calculated, and serialized optical cable performance abnormity early warning information is generated. The optical cable performance abnormity can be predicted in advance, and stable operation of the data center optical cable is guaranteed.

The invention relates to the technical field of communication, and discloses a network communication chip signal interference suppression processing method. The method comprises the following steps: acquiring a local oscillator phase jitter sequence in real time through an on-chip phase noise monitoring unit; estimating Doppler frequency shift and channel coherence time based on the sequence; dynamically adjusting the closed-loop bandwidth of the phase-locked loop; and generating a phase compensation signal, and performing time-varying channel minimum mean square error equalization in combination with a received baseband signal to eliminate inter-symbol interference. The system integrates a phase noise monitoring function module, a channel parameter estimation function module, a phase-locked loop bandwidth regulation function module, a phase compensation generation function module and an interference joint elimination function module. By means of dynamic bandwidth reconstruction and high-precision phase compensation, the bit error rate under high-speed movement is remarkably reduced, the 5G millimeter wave communication standard requirement is met, and the method has the advantages of being achieved on a whole chip, low in delay and high in robustness.

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

A wireless communication device includes RF input to receive RF signals in a range of DC to 300 GHz. The wireless communication device includes RF front-end that includes plurality of band filters to apply band-specific filtering operation to the received RF signals to obtain filtered RF signals. A local oscillator generates tunable local oscillator frequencies above a threshold frequency. The wireless communication device includes circuitry to execute a frequency shifting operation in one or more frequency conversion stages in which one or more tuned local oscillator frequencies above the threshold frequency are injected at the circuitry to push image frequencies above the threshold frequency and shift the filtered RF signals to predefined intermediate frequencies. The filtered RF signals are digitized and a processor concurrently processes the digitized down-converted signals across predefined intermediate frequencies, based on configuration of MLO parameters and performs a real-time or near real-time enhanced spectrum monitoring operations.

The present application relates to the field of wireless communications. Provided are a Doppler frequency shift compensation method and apparatus, and a device and a storage medium. The method comprises: acquiring ephemeris information of a satellite; on the basis of the ephemeris information and a first frequency shift value which is estimated using a beam position center, compensating for a synchronization signal block (SSB) within a beam position, and sending a pre-compensated SSB to a terminal; and then, on the basis of a second frequency shift value, which has been updated via interpolation, compensating for an uplink signal and a downlink signal within the beam position, and sending a pre-compensated downlink signal to the terminal. A terminal can perform Doppler frequency shift compensation without relying on GNSS location information, thereby reducing the cost and usage power consumption of the terminal, decreasing the number of times that the terminal performs frequency sweeping in an initial access stage, and shortening the latency for the terminal to access a cell.

The invention relates to the technical field of industrial process intelligent analysis, in particular to a method and system for monitoring the regeneration process of make-up water resin, and the method comprises the steps of monitoring backwashing, water filling, layering and regeneration processes through images and sensing signals, judging a reaction endpoint, calculating the optimal regeneration duration and outputting a monitoring result. The expansion height and layering texture features of a resin bed are captured through machine vision, the physical form is accurately fed back to avoid resin loss and guarantee the layering effect, the gas-liquid phase change moment is sensitively captured through the frequency shift characteristic of vibration frequency, the filling degree of a tank medium is guaranteed, and the contact efficiency is improved. According to the method, the concentration trend and the conductivity variance are analyzed in combination with least square regression, the chemical equilibrium endpoint of the ion exchange reaction is intelligently recognized, the optimal operation duration is calculated by applying nonparametric trend inspection, data driving in the regeneration process is achieved, and the agent consumption and the time cost are remarkably reduced on the premise that the effluent quality is guaranteed.

The invention discloses a chirp interval modulation backscatter communication method and a chirp interval modulation backscatter communication system based on variable-length scrambling codes, which mainly solve the problems of high power consumption of backscatter labels and high system deployment cost in the prior art. According to the scheme, a sending end sends an environment LoRa signal; the backscattering label modulates information to be sent to an environment LoRa signal in a time interval modulation mode, and modulates a variable-length scrambling code to an anchor symbol; a receiving end performs frequency shift compensation on the backscattering signal by adopting a frequency shift compensation method, demodulates the backscattering signal by combining a sliding window with a variable-length scrambling code, intercepts a backscattering signal sample through the sliding window, and performs de-spreading and fast Fourier transform (FFT) on the signal in the window; the position of an anchor symbol is determined by detecting the maximum value of an FFT peak value, information sent by the backscattering label is recovered from the position of the anchor symbol, and data demodulation is completed. On the premise of keeping demodulation reliability, the power consumption of the tag is effectively reduced, the deployment cost of a backscatter communication system is reduced, and the method can be used for ultra-low power consumption Internet of Things communication.

An audio authentication and identity verification system and method that encodes dynamic cryptographic information across the audible and inaudible spectrum (0 Hz→30 kHz, scalable to 124 kHz). A rolling acoustic signature simultaneously embeds identity, time, date, and GPS location using a hybrid of frequency shift keying (FSK), phase shift keying (PSK), Morse style pulse duration modulation, and time domain multiplexing. To guarantee post-event privacy and integrity, the system further incorporates a dual custody audio architecture in which every authenticated recording is split into complementary bit interleaved segments stored separately, and the decryption key is fragmented via Shamir 3-of-5 secret sharing—preventing unilateral access or tampering. The system establishes a tamper proof, real time, and offline capable authentication layer that functions in air, through conventional microphones, and via dedicated emitter hardware.

The invention provides a laser frequency stabilization device and method based on optical frequency shift, and relates to the field of laser frequency stabilization, and the device comprises a first slave laser, a first frequency stabilization system, a second slave laser, a second frequency stabilization system, a master laser, an acousto-optic modulation module, and a phase-locked frequency stabilization device. The first slave laser is used for emitting first laser of a first wavelength; the main laser is used for emitting third laser with a second wavelength; the first frequency stabilization system is used for locking the first laser according to the first laser to obtain first frequency-stabilized laser; the second slave laser is used for emitting second laser with the first wavelength; the second frequency stabilization system is used for locking the second laser to obtain second frequency-stabilized laser; the acousto-optic modulation module is arranged between the first slave laser and a light path of the phase-locked frequency stabilization equipment; and the phase-locking frequency stabilization equipment is used for receiving the first frequency stabilized laser and the second frequency stabilized laser and carrying out frequency locking on the third laser according to the first frequency stabilized laser and the second frequency stabilized laser. According to the invention, the modulation transfer spectrum and the optical frequency shift can be combined to complete frequency locking of the laser.

A single-station positioning method based on Doppler frequency shifts and time difference information, and a system and an electronic device. The method comprises: acquiring an actual period of a pilot signal sent by an unmanned aerial vehicle (S1); on the basis of the actual period of the pilot signal sent by the unmanned aerial vehicle, determining two adjacent target signals sent by the unmanned aerial vehicle in a target area, and acquiring actual center frequencies of target signal information, an actual time difference of arrival between the two target signals at a receiving base station, actual angles of arrival, and actual Doppler frequency shifts of the unmanned aerial vehicle (S2); importing an actual range of the target area, the actual period of the pilot signal, the actual center frequencies of the target signals, the actual time difference and the actual angles of arrival into variables in a preset theoretical Doppler frequency shift model, so as to obtain a theoretical Doppler frequency shift value table, wherein the table comprises different theoretical Doppler frequency shift values corresponding to different distances from the unmanned aerial vehicle to the receiving base station (S3); performing error metric calculation processing on the actual Doppler frequency shifts and each theoretical Doppler frequency shift value, so as to obtain a theoretical Doppler frequency shift value corresponding to the minimum error metric (S4); and on the basis of the theoretical Doppler frequency shift value corresponding to the minimum error metric, determining the positions at which the unmanned aerial vehicle sends the target signals (S5). The method can ensure the accuracy of single-station positioning in a complex scenario.

The invention relates to the technical field of precision measurement and instrument testing, in particular to a test error analysis method based on a high-precision acoustic phased array Doppler log, and aims to solve the problems that a traditional Doppler log mostly adopts a black box model driven by pure data, explicit modeling of a sound wave propagation and array receiving physical mechanism is lacked, and the test error analysis accuracy is poor. The problems that the generalization ability is weak under errors such as channel amplitude-phase mismatch and emission nonlinearity, real Doppler frequency shift is difficult to accurately extract, and the credibility of speed estimation cannot be quantified, so that output in a complex underwater environment is unreliable are solved. Physical priori such as an acoustic wave equation, a Doppler effect and array manifold is embedded into a neural network, physical consistent modeling and efficient reasoning of multi-channel echoes are achieved, an uncertainty quantification mechanism based on the evidence theory is further introduced, and the reliability and the likelihood of velocity estimation are dynamically evaluated, so that the reliability and the reliability of velocity estimation are improved. And the robustness and interpretability of the system in a complex underwater environment are effectively improved.

The invention discloses a satellite Internet of Things uplink signal detection method and a satellite Internet of Things uplink signal detection system, which integrate traditional signal processing and advanced spiking neural network technologies, realize high-precision frame synchronization by performing two-dimensional cross-correlation matching in a time-frequency domain, and perform low-power-consumption and high-robustness symbol judgment by using an event-driven spiking neural network. Compared with a traditional method based on FFT or matched filtering, the method has higher adaptability and detection performance in a satellite Internet of Things scene with large Doppler frequency shift, low signal-to-noise ratio and dense users.

The invention discloses a Doppler frequency shift compensation method, a Doppler frequency shift compensation device and electronic equipment. The method comprises: a user equipment receiving a first message issued by a satellite, the first message carrying a first compensation value corresponding to a Doppler frequency shift between the satellite and the user equipment, and the first compensation value being used for pre-compensating a downlink signal sent by the satellite; in response to the first message, determining the distance between the user equipment and the beam center position of the satellite; and under the condition that the distance is greater than a preset threshold value, performing post-compensation on the frequency deviation of the received downlink signal according to the first compensation value. According to the invention, the technical problem that the accuracy of satellite compensation and the power consumption of terminal compensation cannot be effectively balanced in a Doppler frequency offset compensation scheme adopted by the related technology by adopting a sending end compensation or receiving end compensation mode is solved.

The invention provides an inclined shaft gas-liquid slug flow ultrasonic flow velocity monitoring and calculating method and system, and the system comprises an ultrasonic flow velocity monitoring probe array module, a signal collection and preprocessing module, and a data processing and calculating module. The method comprises the following steps: performing variational mode decomposition on a signal, separating characteristic components of different flow structures in slug flow, realizing real-time discrimination of a liquid slug and a liquid film section and accurate capture of liquid phase apparent velocity, and accurately calculating gas phase apparent velocity through a unified mechanism model. Through the multi-angle same-direction array design, the measurement deviation caused by non-uniform cross section flow velocity distribution of the inclined shaft is overcome; the composite signal in the slug flow is effectively separated through variational mode decomposition, and the frequency shift extraction precision is improved; the innovative real-time flow state discrimination method based on the signal-to-noise ratio realizes the self-adaption of the measurement model to the flow structure, and significantly improves the measurement accuracy under the complex intermittent flow.

The invention relates to the technical field of satellite communication, and discloses an efficient encoding and decoding and distribution transmission method for satellite image data, which comprises the following steps of: acquiring satellite epoch parameters, estimating a downlink channel capacity sequence, decomposing the image data into a basic feature code stream and a background residual code stream, and distributing a transmission priority, and mapping the basic feature code stream to the most significant bit of the modulation symbol, mapping the background residual code stream to the least significant bit of the modulation symbol, and implementing nonlinear displacement stretching on the coordinate of the constellation point where the modulation symbol is located according to the carrier frequency shift change rate. A core semantic bit phase tolerance boundary is expanded by compressing a background data judgment space, high-fidelity transmission of key image features in a severe phase distortion environment is ensured, and the information transparent transmission capacity in a high-dynamic link is improved.

The application provides a user positioning method and device for low-orbit satellite communication and satellite network equipment, relates to the technical field of satellite communication, and the device comprises a receiving unit configured to receive a transmission delay and a Doppler frequency shift reported by a terminal device; a first processing unit configured to control the satellite network equipment to perform the following first operation: calculating a first included angle from the terminal device to a subsatellite point via a satellite according to the transmission delay and an orbital height of the satellite; calculating a second included angle from the subsatellite point to the terminal device in a satellite moving direction via the subsatellite point from a satellite overhead angle according to the first included angle, the Doppler frequency shift, a carrier frequency and a satellite moving speed; and determining position information of the terminal device according to the first included angle and the second included angle. The application can automatically estimate the position information of the terminal device without the terminal device reporting the position information, ensure the service continuity of a communication architecture depending on the terminal device information, and protect the user privacy and safety.

In the field of ultrastable laser technology, tuning an ultrastable laser maintains its performance indicators without increasing additional lock noise and out-of-loop drift. [Solution] One acoustic-optic modulator and one electro-optic modulator are introduced separately, and the laser device, frequency shift unit, PDH frequency stabilization control unit, and ultra-stable cavity are integrated. [Effects] By changing the frequency of the acousto-optic modulator, high-precision tuning of the ultra-stable laser can be achieved. By changing the frequency of the electro-optic modulator, wide-range tuning of the ultra-stable laser can be achieved, enabling wide-range, high-precision, and dead-zone-free frequency tuning.

The invention discloses a radio frequency identification method and device. The method comprises the following steps: an RFID reader sends a first signal to an RFID tag; the RFID reader receives a second signal sent by the RFID tag through at least three receiving antennas; and the RFID reader determines the position of the RFID tag based on the second signals received by the at least three receiving antennas. Wherein the second signal comprises a plurality of sub-signals, each sub-signal in the plurality of sub-signals is a frequency shift signal of the first signal, and the center frequencies of the plurality of sub-signals are different. The RFID tag is positioned based on the second signals received by the at least three receiving antennas, additional equipment such as a mobile robot is not needed, the positioning scheme is simple, and the cost is lower. The second signal comprises a plurality of frequency shift signals with different center frequencies, on one hand, same-frequency interference can be avoided, on the other hand, a plurality of sub-signals can be synthesized into a broadband signal, the bandwidth of the signal for positioning is larger, and the positioning precision is improved.

A system for determining at least one biomechanical property of a reproductive cellular structure includes a radiation source for generating illuminating radiation, at least one optic for directing the illuminating radiation onto at least a portion of the reproductive cellular structure, a detector for detecting at least a portion of radiation scattered from the reproductive cellular structure, a spectrometer for generating a frequency spectrum of the detected scattered radiation, and an analyzer. The analyzer is configured to identify at least one Brillouin frequency shift in the frequency spectrum for the at least a portion of the reproductive cellular structure, and determine viability of the reproductive cellular structure based on the at least one Brillouin frequency shift.

Blood glucose level measurement includes a light source configured to irradiate light to a subject; a monochrome part configured to separate wavelength components of the light that is reflected and scattered from the subject; a light receiver configured to receive the light transmitted via the monochrome part and to generate electrical signals based on the received light; and a processor configured to extract information on the blood glucose level of the subject based on a frequency shift of the light due to the Raman effect.

This invention discloses a near-field heat flux control device and its control method, relating to the field of near-field thermal radiation control technology. The device includes a first radiator, a second radiator, and an intermediate control layer. The intermediate control layer, disposed between the two radiators, is composed of a narrow bandgap semiconductor material. Its carrier concentration changes smoothly with temperature, and its dielectric response characteristics continuously change with temperature, driving a frequency shift in the plasma frequency. The temperature of the intermediate control layer can be adjusted to amplify or suppress the heat flux. By using a narrow bandgap semiconductor and utilizing the temperature change of carrier concentration to drive a continuous blue shift in the plasma frequency, a spectral sweep effect is induced between the two radiators. This differs from the lattice abrupt change mechanism of phase change materials. Under an idealized temperature-shifting material model, the theoretical heat flux amplification factor of the device can reach over 100. When InSb is used as the intermediate control layer and simulations are performed based on its actual material parameters, the device maintains stable amplification performance over a continuous temperature range of approximately 40K.

The invention relates to the technical field of railway vehicles, and provides a sound absorption device and a railway vehicle. In the sound absorption device, a surrounding plate structure and a flexible film in sealed connection form a closed cavity, at least one through hole is formed in the flexible film, hollow pipes and the through holes are arranged in a one-to-one correspondence mode, one ends of the hollow pipes are inserted into the corresponding through holes, and the other ends of the hollow pipes penetrate through a sound absorption structure and extend to an interval space between the sound absorption structure and a cavity bottom. And a coupling resonance sound absorption system of the flexible film, the hollow pipe, the interval space and the closed cavity is formed. According to the sound absorption device, the sound resistance and the sound quality are improved through the hollow pipe, the resonance frequency is made to move to the low frequency in cooperation with dual coupling resonance of the flexible film and the hollow pipe and dual coupling resonance of the hollow pipe and the cavity, and low-and-medium-frequency noise of 100-500 Hz is efficiently absorbed; the two types of coupling resonance cooperate to broaden the sound absorption frequency band, and the sound absorption structure is attached to the flexible film to enhance the sound energy dissipation efficiency. Efficient low-frequency sound absorption can be achieved without increasing the size, the requirements for light weight and thinness of railway vehicles are met, and the noise control effect is improved.

This invention relates to an optical frequency domain reflectance distributed magnetic field sensing method based on image denoising, comprising the following steps: acquiring and processing Rayleigh scattering signals under no magnetic field and with magnetic field conditions using an OFDR system; performing Fast Fourier Transform on the reference signal under no magnetic field and the measurement signal under magnetic field conditions to obtain the distance domain signals at various positions of the corresponding optical fiber under the two magnetic field conditions; performing windowing and zero-padding operations; obtaining the local reference Rayleigh scattering spectrum and the local measurement Rayleigh scattering spectrum, and removing the DC component; performing cross-correlation calculation, arranging the grouped normalized cross-correlation results along the corresponding positions of the optical fiber to obtain the three-dimensional cross-correlation map at various positions of the optical fiber, and then projecting it onto a two-dimensional plane to obtain the original two-dimensional cross-correlation intensity map, and cutting it into blocks; denoising a certain block as the original block to obtain the integral image; obtaining the final denoised two-dimensional cross-correlation intensity map; and obtaining the frequency shift distribution of the magnetic field intensity spectrum.

The invention discloses an optical fiber excess length state detection method, device and equipment of a submarine cable and a storage medium, and belongs to the technical field of electric power detection, and the method is suitable for the submarine cable comprising an external non-stress cable section and a submarine stress cable section. The method specifically comprises the following steps: detecting stress Brillouin frequency shift of a target detection position on a seabed stress cable section and non-stress Brillouin frequency shift of a plurality of preset detection positions on an external non-stress cable section in real time; calculating a temperature compensation frequency shift value based on the non-stress Brillouin frequency shift of each preset detection position; performing temperature compensation on the stressed Brillouin frequency shift on the basis of the temperature compensation frequency shift value, and calculating to obtain a pure stress frequency shift of the stressed section; the pure induced frequency shift of the stress section is compared with a critical frequency shift threshold value and a linear frequency shift threshold value, and a frequency shift comparison result is obtained; and determining the optical fiber excess length state of the submarine cable according to the frequency shift comparison result. Therefore, by implementing the method, the problem of low submarine cable state detection accuracy in the prior art can be solved.

A signal processing device and a signal transceiver device are provided. The signal processing device includes a first amplifier, two first choppers, a second chopper, and a third chopper. The first amplifier is configured to generate a second signal from a first signal. The two first choppers are embedded between an input and an output of the first amplifier and are configured to perform a first frequency shift and a first frequency shift back, respectively. The second chopper is coupled to the input of the first amplifier and is configured to perform a second frequency shift. The third chopper is coupled to the output of the first amplifier and is configured to perform a second frequency shift back. The first frequency and the second frequency are different.

The application provides a method for homogenizing the polarizability of an atomic sensor based on a singular point super surface, which can effectively improve the spatial uniformity of the pumping light intensity in a micro-nano nuclear magnetic resonance gyroscope, thereby enhancing the uniformity of the atomic polarizability along the propagation direction and improving the average value, so as to reduce the light frequency shift error. While realizing the reflection enhancement of the pumping light, the reflected light has the opposite rotation direction and propagation direction compared with the incident light, and the pumping effect on the alkali metal atoms in the gas chamber is equivalent. Compared with the traditional scheme and the reflection mirror enhancement scheme, the application can significantly improve the detection sensitivity and signal-to-noise ratio of the sensor while keeping the element miniaturized.

This invention discloses a wireless, passive, and visualized cerebrospinal fluid drainage tube flow monitoring sensor, system, and fabrication method, belonging to the field of biomedical sensing and microelectromechanical systems (MEMS) technology. It includes a flexible substrate, an interdigital capacitor-open resonant ring structure disposed on the substrate surface, and a microchannel pressure conversion structure bonded to it; the microchannel corresponds vertically to the position of the interdigital capacitor. The pressure generated by the cerebrospinal fluid flow drives the displacement of the liquid metal, modulating the equivalent dielectric constant of the interdigital capacitor and causing a resonant frequency shift. The frequency drift is wirelessly read by an external device, and the flow rate is calculated using an algorithm, achieving passive wireless continuous monitoring. This invention, employing the aforementioned sensor, system, and fabrication method, solves the problems of high infection risk, low accuracy, and inability to continuously monitor existing drainage monitoring methods that rely on manual observation or wired sensors. It has the advantages of high sensitivity, flexible integration, and good safety.

The invention discloses a device and a method for testing frequency domain characteristics of a high-speed optoelectronic device. The device comprises a laser, a sawtooth wave generator, a signal source, an acousto-optic modulator, an electro-optic intensity modulator, a low-frequency photoelectric detector, a frequency spectrograph and a computer. An electro-optic intensity modulator is driven through a sawtooth wave modulation technology, and frequency-shifted and non-frequency-shifted optical carriers and frequency-shifted and non-frequency-shifted radio frequency optical sidebands are synchronously generated in an optical path in combination with radio frequency signal modulation. And after the signal is subjected to beat frequency processing by the photoelectric detector, the power of the frequency shift signal in different working states is measured by the frequency spectrograph, so that the frequency domain characteristic parameters of the photoelectric device to be measured are obtained. The method is based on sawtooth wave modulation and an amplitude comparison method, frequency domain response characteristics of a single / dual-drive electro-optic intensity modulator, dual-parallel electro-optic intensity modulation and a photoelectric detector can be accurately represented, the test method is simple, and dependence on a high-frequency test instrument is effectively reduced.

By utilizing soliton self-frequency shift modulation, the formation of multiple pulsed light beams is suppressed, while the occurrence of ASE (Autonomous Emission Reduction) is suppressed, and the modulated pulsed light beam is reliably amplified. [Solution] The pulsed light generation device 100 comprises an oscillator 1 that oscillates pulsed light L, a fiber amplifier 2 located downstream of the oscillator 1 in the optical path of the pulsed light L, a soliton shift fiber 5 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, a branching section 8 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, and a short-wavelength fiber amplifier 11 located downstream of the soliton shift fiber 5 and the branching section 8 in the optical path of the pulsed light L.

This invention discloses a method for correcting positioning errors of missile-borne SAR, specifically relating to the field of satellite positioning technology. It is used to solve the problem of unstable positioning error correction caused by the non-rigid deformation between the antenna phase center and the inertial navigation unit not entering the continuous solution chain during high-dynamic flight. By synchronously acquiring satellite positioning observation residuals and raw acceleration data, an acceleration gradient sequence is generated. In the first update cycle, the reference non-rigid deformation vector is extracted and a model degradation command is generated. In the second update cycle, the dynamic spatial offset of the antenna phase center is extrapolated, and then a Doppler frequency shift compensation sequence is generated by projecting along the instantaneous line-of-sight direction of the synthetic aperture radar and fed forward into the radar processor.