18 results about "Pulse-Doppler radar" patented technology

The application discloses a kind of pulse Doppler radar weather cloud clutter automatic filtering methods, belong to radar data processing technical field.The method utilizes the statistical characteristics of weather cloud clutter on radar echo spectrum diagram, and the spatial position and motion characteristics of radar track in monitoring area, realizes the automatic identification and effective elimination of weather cloud clutter, reduces false track, and improves the detection performance of radar to "low, slow and small" target.

This invention discloses a method for compressing and transmitting pulse Doppler radar image signals, comprising the following steps: S1, acquiring pulse Doppler radar RD data and performing CFAR calculations on the RD data; S2, compressing the pulse Doppler radar RD data using the CFAR calculation results; S3, transmitting the compressed pulse Doppler radar RD data; S4, forming an image from a reconstructed RD map and map subframes using the pulse Doppler radar RD data. This invention can transmit the main information contained in the RD map with minimal loss of pulse Doppler radar RD map information using a smaller bandwidth.

The application discloses a multi-target detection method in a complex electromagnetic interference environment for a pulse Doppler radar, a joint reverse diffusion process is introduced to jointly update interference samples and amplitude samples, and thus the problems of target signals being covered or submerged by interference signals, rising of a detection false alarm rate, and difficulty in effectively separating interference from targets can be overcome; a denoising score matching criterion is introduced to train a neural network of an interference score function, so as to solve the problems of high interference intensity and complex structure in multi-target detection in a complex electromagnetic interference environment; and a sparse Bayesian learning method is introduced to adaptively model a sparse structure of multi-target echo signals. The application further provides a multi-target detection device in a complex electromagnetic interference environment. The method provided by the application can realize modeling and suppression of multiple types of interference, and simultaneously improve the detection probability of multiple low observable targets in the distance and Doppler dimension, the interference suppression capability, and the system robustness in a complex electromagnetic environment.

The invention relates to the related technical field of signal processing, in particular to a signal processing method and system for a radar life detector, and the method comprises the steps: collecting a radar detection signal, and configuring a parameter judgment reference; evaluating the analysis feasibility of the pulse Doppler radar signal, and determining a local detection sub-region under the echo signal intensity distribution mark; and adjusting the sampling frequency and the detection coverage of the signal processing unit, and generating a detection report. The technical problems that signals are processed at a fixed sampling frequency and a detection range, blind analysis is still performed when the effective analysis probability of the signals is low, local signals are easily ignored under a complex terrain, and the detection reliability is difficult to guarantee are solved, an effective analysis probability evaluation mechanism is introduced, only high-probability analyzable signals are deeply processed, local detection sub-regions are locked, and the detection reliability is ensured. The technical effects of synchronously adjusting the sampling frequency and the detection coverage range, eliminating a detection blind area under a complex terrain, performing registration correction on radar scanning surface data and discrete point data, and ensuring the detection reliability are achieved.

The invention belongs to the technical field of radar height measurement, and particularly discloses an inter-pulse phase modulation radar height measurement method based on range ambiguity. The method comprises the following steps: a transmitting branch of a pulse Doppler radar altimeter transmits a pulse signal; a receiving branch of the pulse Doppler radar altimeter receives the echo signal; obtaining an echo signal after the range gate is gated, and determining a demodulation code corresponding to the range gate; and carrying out decoding identification on the echo signal of the target distance received at the distance door according to the demodulation code. According to the scheme, the technical problem of fuzzy ranging of the pulse Doppler system radar altimeter is solved.

The invention discloses a medium pulse repetition frequency set selection method based on an ant colony optimization algorithm and a storage medium, an optimal selection problem of a medium pulse repetition frequency set is modeled as a combinatorial optimization problem, and by introducing the ant colony optimization algorithm, on the premise of satisfying distance and speed fuzzy elimination constraints, the optimal selection problem of the medium pulse repetition frequency set can be solved. And the blind area proportion in the radar measurement space is minimized. According to the method, the optimization efficiency of the medium pulse repetition frequency set can be effectively improved, the blind area of the distance-Doppler two-dimensional space is remarkably reduced, the convergence speed and the global optimization capability of the algorithm are improved, and the method has good practical value and popularization prospect and is suitable for improving the target detection performance of a pulse Doppler radar system.

This invention discloses a radar target detection method and system under plasma sheath coverage, mainly addressing the problem of poor target detection capability in existing technologies for plasma sheath-covered target scenarios. The implementation scheme is as follows: The received pulse Doppler radar signal is obtained and pulse compression processing is performed; a sliding window is set for the compressed echo signal, and a first threshold is calculated to determine the signals within the sliding window, obtaining detection signals that pass the first threshold; the likelihood ratio function of the detection signal is obtained, and the logarithm of the likelihood ratio function is taken to obtain a weighted statistic; the detection signal is subjected to noise normalization processing, and the normalized value is substituted into the weighted statistic to obtain a detection statistic, thus obtaining a false alarm probability function; a second threshold is determined based on the false alarm probability function, and it is compared with the detection statistic to obtain the target detection result. This invention can reduce the impact of radar echo noise interference, improve the radar detection signal-to-noise ratio, and can be used for radar detection and parameter estimation of targets covered by plasma sheaths.

The invention discloses a multi-target detection method for a pulse Doppler radar in a complex electromagnetic interference environment, and the method introduces a joint back diffusion process to carry out the joint updating of an interference sample and an amplitude sample, and can solve problems that a target signal is covered or submerged by an interference signal, the detection false alarm rate is increased, and the interference and a target are difficult to be effectively separated. A denoising score matching criterion is introduced to train a neural network of an interference score function so as to solve the problems of high interference intensity and complex structure during multi-target detection in a complex electromagnetic interference environment. A sparse Bayesian learning method is introduced to adaptively model a sparse structure of a multi-target echo signal. The invention further provides a multi-target detection device in the complex electromagnetic interference environment. According to the method provided by the invention, modeling and suppression of various types of interference can be realized, and meanwhile, the detection probability and the interference suppression capability of a plurality of low observable targets in distance and Doppler dimensions and the system robustness in a complex electromagnetic environment are improved.

The application discloses a pulse Doppler radar seeker signal processing method and system, and relates to the technical field of signal processing.The method comprises the following steps: acquiring a radar detection environment, constructing a thermal map by analyzing an environmental interference frequency band, performing wave frequency processing constraint on a detection fundamental wave, and generating a fundamental frequency electromagnetic detection wave; deploying a parallel detection mode, performing parallel emission and echo reception of the fundamental frequency electromagnetic detection wave under a time sequence, performing main lobe interference filtering and multi-dimensional tensor decomposition on a received echo signal group, and determining a target signal group; and importing the target signal group into a signal processor, performing parallel processing of static dimensions and dynamic dimensions and result fitting, and outputting a radar detection result.The application solves the technical problems of insufficient anti-interference performance of a radar seeker in a complex strong interference environment and low target detection precision in the prior art, and achieves the technical effects of improving target recognition capability and anti-interference performance, improving radar detection accuracy and reliability.

The present application relates to a kind of airborne pulse Doppler radar system signal level simulation method, the method is established radar system three-dimensional scene by STK software, then through SystemVue software builds airborne pulse Doppler radar signal level simulation model, simultaneously by simulation scene interface model and STK software connection, read the parameter information in the parameter configuration file report of the detected aircraft target in Access association, after running machine simulation model, obtain the visualized graphic simulation result of the speed and distance of the detected aircraft target of each level processing process of airborne pulse Doppler radar signal and the detection simulation result of airborne pulse Doppler radar.The present application can make the design, application, verification of airborne pulse Doppler radar system more close to actual use scene, and greatly improve the fidelity and practicality of airborne pulse Doppler radar system simulation, provide a platform for system to carry out actual confrontation environment digital verification.

The invention discloses a coherent suppression interference signal generation method based on optical time stretching. The method relates to the technical field of optical communication, the technical field of microwaves and the technical field of electronic countermeasures. The method comprises a mode-locked laser MLL, a dual-drive Mach-Zehnder modulator DDMZM, an arbitrary waveform generator AWG, a vector signal generator VSG, an erbium-doped fiber amplifier EDFA, a dispersion compensation fiber DCF and a photoelectric detector PD. An MLL and a DDMZM are adopted to copy a radar signal and a phase step signal in a frequency domain, controllable delay inequality is applied to the copied signal by utilizing the time stretching capability of a DCF, a coherent suppression interference signal is generated through PD beat frequency, coherent suppression interference can be carried out on a synthetic aperture radar (SAR), an inverse synthetic aperture radar (ISAR), a pulse Doppler radar and a continuous wave radar, and the method has the advantages of being simple in structure, convenient to operate and high in practicability. The requirements for transmitting power and parameter reconnaissance are reduced, the limitation of frequency bands and bandwidths of a traditional electronic interference system is overcome, and the future development trend of an electronic countermeasure system is met.

The application discloses a high-speed target detection method for pulse Doppler radar, and is characterized in that the method comprises the following steps: step 1, obtaining echo signals to obtain initial data; step 2, resampling the initial data in a slow time dimension to obtain resampled data; step 3, compensating the resampled data through a velocity ambiguity number matching filter to obtain corresponding corrected data; step 4, performing linear transformation processing on the corrected data to obtain target data; step 5, detecting the target data to construct an effective target parameter set; and step 6, repeating the above steps to output a final effective target parameter set. The application further provides a high-speed target detection device. The method provided by the application can solve the problems of cross-range cells and velocity ambiguity of super-high-speed targets in multi-target detection in a complex scene, thereby realizing high-precision estimation and detection of the distance and velocity of super-high-speed multi-targets.

A method of simulating radar ground and / or sea clutter for a pulse doppler radar. The method comprises providing a terrain model comprising discrete flat ground patches each having a reflectivity, are

The invention belongs to the field of airborne pulse Doppler radar signal processing, and particularly relates to a multi-carrier frequency MIMO system radar-based velocity ambiguity solving method, which comprises the following steps of: performing velocity expansion on targets with equal range gates, calculating the expansion velocity of the current carrier frequency, then calculating the difference value between the expansion velocities, and calculating the velocity ambiguity of each target; sorting the difference values according to a target sequence; setting a speed threshold condition, comparing each difference value with the speed threshold condition according to the sorting sequence, judging whether a difference value meeting the speed threshold condition exists or not, and if yes, determining that ambiguity resolution succeeds; and if not, comparing the expansion speed of each target of the next carrier frequency until a difference value meeting a speed threshold condition is obtained. And if the target does not flicker on the multiple carrier frequencies and is in the detection clear area, only two carrier frequencies of one PRF are needed to complete speed ambiguity resolution, so that compared with conventional ambiguity resolution processing which at least needs three PRF frames, the processing efficiency is greatly improved, and the scanning speed of the radar is further improved.

A self-concealing jamming method for pulse Doppler radar, S1. Measure the radar parameters, generate a jamming signal; S2. A series of accurate modulation jamming signals are formed near the real target echo through distance modulation, speed modulation, amplitude modulation; the present application perceives the environment threat target, aims at the PD system radar, destroys the constant false alarm signal detection mechanism of the radar by accurately controlling the frequency domain and time domain characteristics of the jamming signal, so that the radar cannot detect the target at all, delays the radar to discover the target, or gives the target indication information wrongly, and the signal environment received by the radar is completely normal, the operator of the radar cannot detect the existence of the jamming, and a novel self-concealing jamming effect is achieved.

The invention discloses a time-frequency phase composite modulation communication interference integrated waveform processing method based on intermittent sampling, a generated communication interference integrated signal can generate interference on an enemy, so that deception interference is realized, and the interference effect on a pulse Doppler radar is improved; on the other hand, the communication-interference integrated signal can be transmitted to the receiving end to realize communication between the transmitting end and the receiving end, so that the communication function is expanded on the basis of interference, the communication function and the interference function share resources in aspects of hardware, frequency spectrum, power and the like, the communication distance and the anti-interference tolerance can be improved, the efficiency is improved, and the cost is reduced; based on an intermittent sampling and forwarding interference technology, interference signal parameters are adjusted in three dimensions of time, frequency and phase, communication information is embedded, communication interference integration is realized, the interference effect is improved, and covert communication is carried out by using interference shielding. The method is widely applied to the technical field of communication interference integration.

FIELD: radar.SUBSTANCE: invention can be used in pulse-Doppler (PD) radar stations (RS) of ground or surface basing to solve the problem of selecting a group of moving air objects under narrow-band passive interference (PI), primarily against a background of intense reflections from the underlying earth or water surface, local objects and slow-moving meteorological formations. The claimed method involves forming an adaptive threshold level of a radar detector in a high pulse repetition frequency mode of a probing signal. To do this, a probing signal is generated, emitted, an echo signal is received, and its optimal processing is carried out by heterodyning the echo signals and integrating the obtained results. The interference power is measured in the analysed range resolution elements and a threshold level is formed as the average value of these measurements. In addition, a probing linear frequency-modulated (LFM) signal is formed, and with optimal processing of echo signals, they are demodulated by multiplying them with a heterodyne signal of the same modulation as the probing signal, converting the quasi-continuous signal into a continuous one and its Fourier transform.EFFECT: improving the quality of detection of targets with small components of radial velocities in PD RS under PI.1 cl, 5 dwg

This invention relates to the field of pulse Doppler radar design technology and discloses a method for designing anti-clutter waveform parameters for pulse Doppler radar, comprising the following steps: S1, determining the minimum pulse repetition frequency without velocity ambiguity; S2, calculating the range ambiguity-free correlation parameters; S3, analyzing clutter spectrum characteristics; S4, calculating the signal-to-clutter ratio; S5, determining the usable interval; S6, determining the conversion gate range; S7, calculating the target effective range segment; S8, calculating the anti-clutter waveform parameters. Compared with the prior art, this invention, by pre-estimating the positions of mainlobe clutter and elevation line clutter caused by the ground / sea surface during radar look-down, avoids the target echo overlapping with the high-energy clutter region after spectral folding during waveform parameter design, thereby improving the target detection probability when the waveform parameters cannot meet the condition of no velocity ambiguity.