65 results about "Frequency agility" patented technology

The invention belongs to the technical field of multifunctional radomes, and particularly relates to a frequency-agile absorption and transmission integrated electromagnetic metasurface and radome, the frequency-agile absorption and transmission integrated electromagnetic metasurface comprises a plurality of basic units in periodic array distribution, and each basic unit comprises a wave transmission layer and a wave absorption layer which are oppositely arranged; the wave-transparent layer comprises a wave-transparent dielectric substrate, a wave-transparent metal foil layer I and a wave-transparent metal foil layer II, wherein the wave-transparent metal foil layer I and the wave-transparent metal foil layer II are arranged on the two sides of the wave-transparent dielectric substrate. The wave-transparent metal foil layer I comprises a plurality of metal spiral lines, the wave-transparent metal foil layer II comprises a metal foil, and the metal foil is provided with an annular gap and rectangular gaps distributed around the annular gap; the wave-absorbing layer comprises a wave-absorbing dielectric substrate, and a wave-absorbing metal foil layer I and a wave-absorbing metal foil layer II which are arranged on two sides of the wave-absorbing dielectric substrate; according to the invention, the wave-transparent communication and wave-absorbing isolation functions are realized at the same time, the wave-absorbing frequency band agility function is realized, and the wave-absorbing effect is better.

The invention discloses a frequency agility relativistic magnetron based on a dynamic seal axial tuning assembly, and belongs to the technical field of high-power microwave sources. Comprising an anode cylinder, N anode blades, a vacuum chamber shell, a magnetofluid sealing assembly, N / 2 fan-shaped insertion pieces and a tuning assembly, the vacuum chamber shell is coaxially arranged outside the anode cylinder, and an annular vacuum chamber is formed between the vacuum chamber shell and the anode cylinder; an inner sleeve of the magnetofluid sealing assembly is connected with the anode cylinder, and an outer sleeve is connected with the vacuum chamber shell; the tuning assembly is arranged in the vacuum chamber. According to the invention, the axial movement of the tuning assembly is realized through the matching relation of the anode cylinder, the tuning assembly and the vacuum chamber shell, so that the sizes of the coupling slot and the fan-shaped waveguide cavity are changed, and the resonant frequency of the resonant cavity formed by the fan-shaped resonant cavity, the coupling slot and the fan-shaped waveguide cavity is changed; and finally, real-time frequency agility of the device in a high-vacuum state is realized.

The invention discloses a frequency agility cognitive SAR (synthetic aperture radar) anti-interference strategy generation method based on action migration-demonstration learning, which is applied to the field of SAR anti-interference and mainly solves the problems of low anti-interference strategy generation speed and unstable initial performance of the existing SAR system in a complex interference environment. According to the method, modeling is carried out on an FASAR anti-interference confrontation scene, and an FASAR anti-interference strategy generation problem is converted into a Markov decision process (MDP) problem. The invention provides a two-stage reward shaping method to solve the sparse reward problem in the decision making process. According to the method, an ATLfD method is provided based on a transfer learning framework, FASAR in a target confrontation environment is pre-trained by using interference confrontation experience in a source environment, and learning of an optimal strategy in the target environment is guided by using an expert network trained in the source environment. According to the method, the anti-interference performance of the FASAR in the initial confrontation stage can be improved, and meanwhile the generation speed of the optimal anti-interference strategy is increased.

The invention discloses a frequency agility radar signal sorting and individual clustering method combining inter-pulse and intra-pulse characteristics. The method comprises the following steps: screening an original pulse stream to obtain a screened pulse stream; performing frequency domain filtering on the intermediate frequency data corresponding to each pulse after screening to obtain corresponding intermediate frequency filtering data, and performing down-conversion on the intermediate frequency filtering data of all the pulses after screening to the same frequency to obtain preprocessed intermediate frequency data of each pulse after screening; sorting all pulses corresponding to the preprocessed intermediate frequency data based on the pulse description word of each type of radar to obtain a cluster of the corresponding type of radar; based on an intra-pulse fingerprint feature extraction mode, extracting a fingerprint feature vector corresponding to each cluster after sorting; and clustering the fingerprint feature vectors based on an FCM clustering algorithm of a joint parameter optimization K value to obtain an individual clustering result of the radar of the corresponding model. According to the invention, more accurate radar individual clustering can be realized.

The utility model discloses a low power consumption multichannel transmit-receive frequency agility device, which comprises a fast hopping frequency source unit, an up-conversion channel unit, a down-conversion channel unit and a control and power supply unit, and a frequency source assembly comprises a one-to-two power divider A, a first phase-locked loop branch, a second phase-locked loop branch, a one-out-of-two switch, a one-to-two power divider B and a frequency multiplier. The first phase-locked loop branch and the second phase-locked loop branch are respectively connected between the one-to-two power divider A and the one-out-of-two switch, the one-out-of-two switch is connected with the one-to-two power divider B, the rear end of the one-to-two power divider B is provided with a first output branch and a second output branch, and the frequency multiplier is arranged in the second output branch; the up-conversion channel unit and the down-conversion channel unit are respectively connected with the frequency source assembly. Two phase-locked loop circuits are configured for a channel to form a set of architecture in which a local oscillator signal 1 and a local oscillator signal 2 share a frequency source, so that the use of phase-locked loops is reduced, and the power consumption and the heat consumption are reduced.

The invention specifically relates to a radar intelligent anti-interference method combining an attention mechanism and an A2C algorithm, and the method comprises the steps: constructing a Markov decision process MDP model corresponding to a radar, a target and a jammer, and defining a state space, an action space and a multi-target reward function corresponding to the MDP model; performing feature extraction on the state data by using a preprocessing layer based on a self-attention mechanism to obtain corresponding state features; wherein the state data comprises interference signal frequency information; determining a frequency agility strategy corresponding to the state characteristic by using an actor network; controlling the radar to execute a frequency agility strategy so as to acquire updated state data; the updated state data and the frequency agility strategy are input into a commentator network, and the time difference deviation of the action value function in the current state is obtained; and performing gradient updating on the actor network by using the time difference deviation, and updating network parameters of the actor network by using the updated gradient so as to generate a frequency agility strategy by using the actor network with the updated network parameters.

A laser system (1) comprises an in-phase quadrature-phase optical modulator (4) to generate a two-tone, single-sideband, suppressed-carrier optical signal by modulation of an input laser beam, and a fibre Bragg grating (6) to receive and filter the two-tone, single-sideband, suppressed-carrier optical signal output by the in-phase quadrature phase optical modulator (4). The passband of the fibre Bragg grating (6) excludes harmonics of the frequencies of the two tones in the two-tone, single-sideband, suppressed-carrier optical signal output by the in-phase quadrature-phase optical modulator (4). Thus, the system (1) is frequency-agile and produces highly-phase-coherent light beams.

The present invention relates to a DAC-based pulse radar multi-waveform signal generation method, which belongs to the field of signal processing. The method can flexibly set various signal parameters, adopts a fully digital method to design and generate pulse radar signals in various relatively complex environmental scenarios, and realizes the generation of various pulse radar signal waveforms in the application environment, including frequency modulation (conventional frequency modulation, frequency diversity, frequency agility), frequency repetition rate (PRI) modulation (conventional, staggered, jitter, sliding, jumping), and intra-pulse modulation (intra-pulse single tone, linear frequency modulation, nonlinear frequency modulation, phase encoding, frequency encoding, and hybrid encoding). The method can simultaneously combine various pulse radar waveforms, dynamically adjust according to the DAC working data bit width, and generate corresponding signals according to the signal waveform output mode. The method has obvious advantages in the simulation generation of pulse radar signals in electromagnetic environments.

Presented herein is a frequency-agile transmitter for transmitting either a low or a high frequency signal. The transmitter comprises a low frequency mixing stage for combining at least two input signals encoding input data, the at least two input signals being further combined with a local oscillator signal when transmitting the low frequency signal. The transmitter also includes a transmit element for receiving output from the low frequency mixing stage. The transmit element includes a signal controller for selectively sending the output from the low frequency mixing stage to one of a low frequency transmission path, to transmit the low frequency signal, and a high frequency mixing stage, wherein the high frequency mixing stage up-converts the output from the low frequency mixing stage with a local oscillator signal when transmitting the high frequency signal along the high frequency transmission path.

The invention discloses a wide-area radar system combining satellite-borne mechanical scanning and phase scanning. The wide-area radar system is composed of a central processing unit, a servo controller, an active phased-array antenna and a scanning mechanism. The servo controller is mounted on the platform cabin, is rigidly connected and does not rotate; the central processing unit and the active phased-array antenna are installed on the load cabin, the load cabin is connected with the platform cabin through the scanning mechanism, and the servo controller controls the whole load cabin to rotate around the center of the load cabin. According to the method, a brand new satellite-borne wide-area radar system architecture is constructed, mechanical scanning and electric scanning characteristics are combined, flexible control of beam broadening, tracking staring, wide-area searching, frequency agility, power control and the like of a radar system is supported, and the method has an application mode integrating detection, tracking, imaging and recognition.

The application discloses a networking radar jamming and mutual jamming elimination method based on decentralized Q learning, first, according to the phased array radar signal processing flow, a target echo signal, a jamming signal and a mutual jamming signal model are established, second, the conditions of radar jamming and mutual jamming are analyzed, a multi-radar frequency domain resource scheduling optimization model based on the SIJNR criterion is established, then each radar is regarded as an intelligent agent, the multi-radar cooperative anti-jamming and anti-mutual jamming process is constructed into a generalized Markov decision process, and the frequency domain resource scheduling optimization model is converted into a value function optimization model, finally, the DQJIE algorithm is used to solve the problem, and the frequency agility strategy of each radar is obtained. The method constructs the multi-radar cooperative anti-jamming and anti-mutual jamming process into a generalized Markov decision process, effectively suppresses the mutual jamming in the system while resisting the frequency sweeping jamming, and effectively improves the networking radar detection performance.

The invention discloses a linear frequency modulation signal circuit based on a DDS (Direct Digital Synthesizer), and aims to solve the problems that a traditional frequency agility circuit adopts a single-path DDS circuit to output signals, and the frequency agility rate is limited by the performance of the DDS and is generally in a microsecond level. The switch is adopted to control output and switching of the two DDS circuits, when one DDS circuit is outputting a frequency agility signal, the other DDS circuit completes number setting operation, therefore, when the output signal needs to be switched, the working DDS circuit can be immediately closed, the other DDS circuit which completes number setting is switched on, the frequency agility rate is determined by the switching frequency of the switch, and the frequency agility rate of the DDS circuit is determined by the switching frequency of the switch. And the frequency agility rate is increased to 20ns.

The invention discloses an interference signal suppression method and device based on an inter-pulse carrier frequency agility short pulse signal, a computer readable storage medium and computer equipment, relates to the technical field of communication, and mainly aims to solve the problem that an existing agility system radar is still poor in anti-interference capability in a complex electromagnetic environment and poor in interference performance. And the requirement of effectively detecting a detection target in a strong confrontation environment cannot be met. Comprising the steps that after radar equipment transmits an inter-pulse carrier frequency agile short pulse signal and receives an echo signal, a baseband echo matrix is acquired, and an interference judgment threshold value is determined based on the baseband echo matrix; when the variance of the distance unit of the baseband echo matrix is greater than the interference judgment threshold, determining that the distance unit contains an interference signal; and performing zero setting operation on the distance unit to obtain an echo signal after interference suppression.

The application provides a multi-station frequency agile radar anti-interference and synergistic method, through two short baseline pulse interval frequency agile radars receiving echo signals and carrying out mixing processing and pulse compression; interference pulses of an echo data matrix are removed and the remaining pulses are combined to obtain a new echo data matrix; a distance-speed two-dimensional redundant dictionary matrix corresponding to the new echo data matrix and matched with target information is constructed in combination with transmission parameters; then a compressed sensing model is constructed and a reconstruction result of an original signal is obtained by solving.The application selects two pulse interval frequency agile radars to work synergistically, which can effectively improve signal processing gain, has strong electronic countermeasure capability, good target detection capability and excellent electromagnetic compatibility; by utilizing the characteristic that only some pulses of echo of the pulse interval frequency agile radar may be interfered, the interfered pulses are directly removed in the echo data matrix, and complex matrix operation is not involved, so that the calculation complexity is low and the running speed is fast.

A radio frequency (RF) communications system may include a first RF node that transmits data, including a new frequency of operation, and a sequence of pilot symbols spread with a complex spreading code sequence. A second RF node may receive an incoming signal from the first RF node and perform despreading for N sample offset delays to generate N despreading sequences for the sequence of pilot symbols. The second RF node may perform a cross-correlation to select a desired despreading sequence from the N despreading sequences, determine a phase offset and timing offset, process the incoming signal based upon the desired despreading sequence, phase offset and timing offset, and switch to the new frequency of operation.

The present invention discloses a microwave signal generation method and microwave signal source based on an optoelectronic oscillation loop. The method comprises: adjusting an intensity modulation unit to enable the optoelectronic oscillation loop to operate in a multimode oscillation state; injecting a linear frequency modulation signal or a step-frequency agility signal into the optoelectronic oscillation loop in the multimode oscillation mode, performing de-skewing processing on the loop oscillation signal, and obtaining frequency and phase information of the loop oscillation signal; and controlling a phase delay control unit after processing by a detection and feedback system so that each discrete frequency component of the linear frequency modulation signal or the step-frequency agility signal coincides with the oscillation mode of the optoelectronic oscillation loop. The technical solution provided by the present invention can simultaneously generate a linear frequency modulation signal or a step-frequency agility signal with large bandwidth, low phase noise, and high coherence in both the electrical and optical domains.

The present invention discloses a dual-band pulse compression coding frequency agility anti-interference method and system, relating to the field of radar anti-interference. The method comprises the following steps: Step 1: transmitting a mixed coded signal of the X-band and Ku-band under the triggering of a synchronization signal; Step 2: receiving an echo signal of the mixed coded signal and down-converting the echo signal to an intermediate frequency to obtain an intermediate frequency echo signal; Step 3: sequentially performing pulse compression and signal accumulation processing on the intermediate frequency echo signal to obtain a target signal. The present invention detects targets by transmitting a mixed coded signal of the X-band and Ku-band. When the signal of one frequency band is suppressed by noise interference, the signal of the other frequency band can still operate normally, thereby improving the anti-interference capability of the radar system.

The invention discloses an intelligent frequency agility method and system based on frequency spectrum cognition and deep learning, and the method comprises the steps: generating a plurality of baseband linear frequency modulation signals with different center frequencies, and obtaining a broadband radio frequency linear frequency modulation signal set; inputting the signals into a digital phased array receiving channel at the same time to obtain a multi-path baseband data set; according to the real-time total delay of the receiving channel, performing integral multiple clock period delay on each signal data in the baseband data set to obtain a delay linear frequency modulation signal set; according to the multi-path baseband data set and the delay linear frequency modulation signal set, determining a peak position of each datum in the correlation peak data set through a peak search algorithm model, and further calculating a phase difference set; and removing a first-order linear component and a direct-current component in the phase difference set by adopting a dechirp algorithm to obtain a phase nonlinear set of the digital phased array receiving channel. According to the invention, nonlinear, efficient, accurate and low-cost measurement of the phase of the digital phased array receiving channel can be realized.

The invention discloses a folding clutter suppression method based on a frequency agility radar, and the method comprises the steps: setting the pulse number of a frequency agility pulse sequence, a frequency hopping interval and a frequency hopping coefficient of each frequency agility pulse signal, and transmitting a plurality of frequency agility pulse signals; calculating the carrier frequency of the echo signal received by the frequency agility radar according to the frequency hopping interval and the frequency hopping coefficient; filtering the echo signal by using a frequency domain filter corresponding to the echo signal carrier frequency, and outputting the filtered echo signal; respectively performing impulse response and convolution processing on the time domain and the frequency domain of the filtered echo signal by using a matched filter, and outputting the echo signal after matched filtering; and sparse reconstruction is carried out on observation signals in the sparse reconstruction model by using an orthogonal matching pursuit algorithm or an alternating direction multiplier method to obtain sparse vectors, so that target signal energy is enhanced, non-matching interference components are suppressed, significant enhancement of weak and small targets is realized, and folding clutters and noise are suppressed.

A system and method for testing coherent and frequency agility characteristics of a radar echo simulation device, the system comprising: a local oscillator signal generation module for generating a frequency agile local oscillator signal; a signal transmission module for generating a modulated transmit baseband signal; upconverting the modulated signal and transmitting to the device under test, outputting the phase and frequency of the transmit baseband signal to a phase difference calculation module and a frequency difference calculation module; a signal reception module for receiving a signal returned by the device under test, downconverting the received signal based on the frequency agile local oscillator signal to obtain a receive baseband signal, outputting the phase and frequency of the receive baseband signal to the phase difference calculation module and the frequency difference calculation module; a phase difference calculation module for calculating the phase difference between the receive baseband signal and the transmit baseband signal; a frequency difference calculation module for calculating the frequency difference between the receive baseband signal and the transmit baseband signal; a testing module for determining the coherent characteristic and the frequency agility characteristic of the device under test based on a plurality of sets of phase difference values and a plurality of sets of frequency difference values, respectively.

To provide frequency agile transmitter and receiver.SOLUTION: A frequency-agile transmitter for transmitting either low or high frequency signals is disclosed. The transmitter includes a low-frequency mixing stage for combining at least two input signals encoding input data, the at least two input signals further combined with a local oscillator signal when transmitting a low-frequency signal. The transmitter also includes a transmit element for receiving output from the low-frequency mixing stage. The transmit element includes a signal controller for selectively transmitting the output from the low-frequency mixing stage to one of a low-frequency transmit path for transmitting the low-frequency signal and a high-frequency mixing stage, the high-frequency mixing stage upconverting the output from the low-frequency mixing stage with the local oscillator signal when transmitting a high-frequency signal along the high-frequency transmit path. The transmitting element also includes at least one antenna for outputting one of the low-frequency signal and the high-frequency signal.

The invention belongs to the field of radar signal processing, discloses a method for acquiring a one-dimensional range profile of a high-speed moving target by sub-pulse linear frequency modulation emission and inter-pulse frequency agility radar, and realizes frequency agility waveform echo high-speed target detection and correction based on sparse representation. In the prior art, distance and Doppler parameter estimation of target echoes can be generally realized by adopting sparse representation and sparse processing, and orthogonal matching pursuit (OMP) is one of common solution algorithms. The carrier frequency of a frequency agility radar jumps randomly between pulses, and the acquisition of a one-dimensional range profile of a high-speed moving target not only needs to correct inter-pulse range migration, but also needs to compensate intra-pulse range-Doppler coupling generated by the change of the carrier frequency. According to the method, firstly, compensation of intra-pulse distance-Doppler coupling is carried out, then distance migration correction is carried out on each frequency agility pulse based on a KeyStone method, sparse processing is carried out on a corrected echo signal by adopting an orthogonal matching pursuit algorithm, and a high-resolution one-dimensional distance image of a target is obtained. Experimental results show that the one-dimensional range profile processing method for performing inter-pulse range migration correction through the KeyStone algorithm is beneficial to target detection in high-speed motion.

The invention discloses a radar composite interference time sequence parameter intelligent extraction method based on frequency agility, and relates to the technical field of radars, the radar composite interference time sequence parameter intelligent extraction method based on frequency agility employs an interference separation network fusing convolution enhancement and a Transform attention mechanism to carry out separation processing on radar echo signals, and the radar composite interference time sequence parameter intelligent extraction method based on frequency agility is obtained. The interference separation network strengthens the local feature extraction capability by means of convolution operation, and introduces a cross-scale attention mechanism to capture the global correlation of interference signals, thereby achieving the precise separation of a multi-component composite ISRJ signal, and obtaining a plurality of separated ISRJ component signals. On the basis, through dynamic threshold detection, by means of a robustness measurement algorithm based on pulse detection and clustering optimization, according to time domain characteristics of the ISRJ component signals, accurate measurement of interference parameters such as slice width, forwarding width and forwarding times of the ISRJ component signals is achieved.

The invention provides an anti-severe environment wireless sensing system for a spacecraft. A multi-mode energy collection subsystem is used for collecting heat energy from a spacecraft structure in a high-temperature pneumatic heating environment and converting the heat energy into electric energy; the high-temperature energy storage subsystem is used for storing continuous low-power and transient high-power electric energy and providing transient high-power support for frequency agile communication and acoustic standby communication during sudden communication; the plasma self-adaptive frequency agility communication system is used for realizing self-adaptive wireless radio frequency communication in a plasma sheath layer; the acoustic standby communication subsystem is used for providing an independent structure guided wave acoustic communication channel when all radio frequency bands are shielded by plasma; the multi-parameter sensing subsystem is used for realizing measurement and data preprocessing of multiple physical quantities such as temperature, pressure and acceleration in a high-temperature environment; and the functionally graded material packaging structure is used for buffering thermal expansion mismatch under the conditions of high temperature and strong thermal cycle and integrally packaging the subsystems.

The invention discloses an ultra-wideband frequency agility assembly and a signal synthesis method thereof, and relates to the technical field of communication, the ultra-wideband frequency agility assembly adopts a three-stage cavity longitudinal integrated architecture and sequentially comprises a down-conversion and control power supply assembly 101, a fast frequency hopping frequency synthesizer assembly 102 and an up-conversion assembly 103 from top to bottom, the down-conversion and control power supply assembly 101 and the up-conversion assembly 103 are respectively fixed on the fast frequency hopping frequency synthesizer assembly 102 through fastening screws 106. The device is extremely high in assembly integration level, has the functions of frequency conversion, rapid frequency hopping, power supply control and the like, simultaneously adopts a plurality of single-point frequency signals and the comb spectrum generator for frequency mixing to obtain required local oscillation signals, realizes the function of rapid frequency hopping through a low-cost chip, is excellent in generated signal phase noise, avoids complex program control, and is suitable for large-scale popularization and application. And a reasonable stacking structure is adopted to directly conduct heat to a mounting surface, so that an additional heat dissipation device is saved, and the size is reduced.

The invention relates to a pulse radar multi-waveform signal generation method based on a DAC (Digital-to-Analog Converter), which belongs to the field of signal processing, can flexibly set each parameter of a signal, adopts an all-digital method to design and generate multiple pulse radar signals in a relatively complex environment scene, realizes the generation of multiple pulse radar signal waveforms in an application environment, and improves the signal processing efficiency. Comprising frequency modulation (conventional frequency modulation, frequency diversity and frequency agility), repetition frequency (PRI) modulation (conventional, stagger, jitter, slip and jump) and intra-pulse modulation (intra-pulse single tone, linear frequency modulation, non-linear frequency modulation, phase encoding, frequency encoding and hybrid encoding), various pulse radar waveforms can be combined at the same time, and dynamic adjustment can be performed according to the bit width of DAC working data. Corresponding signals can be generated through adjustment according to a signal waveform output mode, and the method has obvious advantages in simulation generation of electromagnetic environment pulse radar signals.

The invention provides a signal source and a test system, and belongs to the technical field of signal processing, the signal source comprises a phase-locked loop and a controller connected with the phase-locked loop, the controller is used for obtaining a first test parameter, and the first test parameter comprises a target output frequency; determining a target locking voltage corresponding to the target output frequency based on the mapping data table; adjusting an output voltage of a resistance voltage dividing network in the phase-locked loop to be a target locking voltage; the working state of the phase-locked loop is modified from a closed-loop state to an open-loop state, so that the resistance potential-divider network outputs voltage to a loop filter in the phase-locked loop; and modifying the working state of the phase-locked loop from an open-loop state to a closed-loop state, so that a phase discriminator in the phase-locked loop outputs voltage to a loop filter. The resistance potential-divider network is used for outputting voltage to the loop filter, the frequency can be rapidly adjusted to be close to the target output frequency, when the phase-locked loop is in a closed loop state, the frequency is rapidly locked to the target output frequency, and frequency agility is achieved.

The application relates to a long-time accumulation and parameter estimation method under a frequency agile radar system, which comprises the following steps: radar echo signal down-conversion and pulse compression; search parameter interval and search interval initialization; non-uniform frequency domain generalized Radon Fourier transform is adopted to complete distance correction, Doppler phase compensation and hopping phase elimination under specific search parameters, and coherent accumulation is completed; search parameters are traversed, constant false alarm detection is carried out after signal energy is projected to the search parameter domain, if there is a target, the target motion parameters are determined according to the position of the energy peak, and the target motion track is output. The application effectively improves the echo signal-to-noise ratio of a complex maneuvering target and has target detection capability under a strong noise background.

The present invention discloses a method for a frequency agile radar to resist multiple interferences based on the Bandit Algorithm. Aiming at the dynamic and non-stationary electromagnetic spectrum, a frequency agile radar is combined with the Bandit Algorithm, which has been discussed in the field of reinforcement learning for a long time, to effectively avoid the interference coverage band and autonomously select the transmit pulse carrier frequency, so as to adaptively adjust the transmit signal frequency point of the agile radar, with the ability to adaptively resist main lobe interference and better cope with anti-main lobe interference; it improves the radar's ability to resist multiple interferences in a multi-interference environment and makes up for the problem of the weak anti-interference ability of the radar when facing a flexible and changeable interference cluster.

The invention particularly relates to an in-pulse agile waveform design method based on an SA-2opt parallel optimization algorithm, which comprises the following steps of: optimizing an in-pulse frequency-frequency modulation agile waveform based on the SA-2opt parallel optimization algorithm by taking a minimum self-correlation side lobe peak value as a target function, and firstly, preliminarily obtaining a frequency and frequency modulation coding sequence by adopting a simulated annealing (SA) algorithm; local search is carried out on the frequency modulation rate code by using a 2-opt algorithm, multiple groups of the processes are carried out in parallel, and a sequence with the lowest side lobe is selected as a final frequency and frequency modulation rate code. According to the method disclosed by the invention, the distance sidelobe with relatively high frequency coding waveform in the traditional pulse is inhibited, and the waveform complexity is improved, so that the probability that radar signals are intercepted is reduced; the orthogonality between the sub-pulses is improved by adopting a frequency-modulation frequency joint coding method, the mutual shielding characteristic between the sub-pulses is enhanced, and the method can be applied to suppression of intermittent sampling and forwarding interference.