33 results about "Radar system design" patented technology

The invention relates to a phased array radar digital simulation system, and belongs to the technical field of radar system simulation. According to the phased array radar digital simulation system, a system framework is divided into a main sub system and three auxiliary sub systems, wherein the main sub system is a radar workbench simulation sub system and the three auxiliary sub systems are a simulation scene control sub system, a radar main control computer sub system and a radar analysis and evaluation sub system. The functions of the radar workbench simulation sub system are perfected by adding a control word interpreting module, a coordinate conversion module, a flight path intersection model and a loopback word delivering module, and therefore the real-time closed loop simulation of the whole phased array radar system can be carried out. The phased array radar digital simulation system has the advantages of being good in generality, good in instantaneity and capable of achieving the closed loop simulation, and can be applied to the design of modern phased array radar systems.

The invention discloses a microwave correlated imaging simulation method based on an analysis surface element. The method comprises the steps: firstly constructing a target 3D model scene, obtaining the space information of a corresponding target scene according to observation parameters, calculating a single-scattering coefficient and a multi-scattering coefficient of the target scene, and obtaining the scattering coefficient distribution of the observation scene; secondly calculating an echo signal of the target scene according to a radiation field of a random antenna wave beam in an imaging plane; finally carrying out the correlating of the radiation field and the echo signal, and obtaining a simulation image result. The method achieves a quick simulation process in correlation imaging under the condition of the random radiation field, gives a solution for distributed scene correlation imaging high-efficiency simulation, can deepen the understanding of the imaging mechanism and scattering mechanism in a whole correlated imaging link, provides support for the design and index argument of the design of a correlated imaging radar system, also can be used for subsequent correlated imaging evaluation and image interpretation, and is high in practical value.

The invention provides a GB-SAR deformation monitoring method based on triple stepping. According to radar system design, GB-SAR based on triple stepping is utilized for deformation measurement; for first stepping, stepped frequency continuous wave (SFCW) signals are employed to synthesize large signal bandwidth, isolation is improved through transceiver antenna separation; for second stepping, a radar device is mounted on a linear guide rail and does stepping motion in a stop-go-stop mode, orientation resolution is improved through relatively large aperture synthesis, signals are emitted and received by the radar device in stop periods, so a phase error caused by signal transceiving in motion periods is avoided; for third stepping, radar device antennas do stepping motion sequentially along the orientation, a relatively wide monitoring area is covered, and data at different antenna positions are spliced and are used for imaging processing. Imaging processing on acquired data is carried out based on echo signal characteristics of the GB-SAR system, compensation for an instantaneous slant range difference between pulses is not necessary, computational complexity is relatively low, and timeliness requirement of the GB-SAR system can be satisfied.

A radar system, a medical diagnostic or therapeutic device and a method are disclosed for operating a radar system. An embodiment of the radar system includes an antenna arrangement embodied to be flat including individually actuatable transmit units for the transmission of radar signals and individually readable receive units for the receipt of radar signals. The transmit units and the receive units each include at least one antenna. Because the transmit units can be individually actuated and the receive units can be individually read out, the information content which can be obtained even without a strong spatial orientation of the radar beam, is increased. According to an embodiment of the invention, the radar system is designed to assign a radar signal received by a receive unit to the transmit unit which transmitted the radar signal received.

Signal compensation systems and methods compensate an estimated range profile from a plurality of detected signal returns from a true range profile, wherein the signal returns correspond to an emitted stepped frequency pulse-train. An exemplary embodiment utilizes knowledge of the radar system design to identify locations, predict power levels, and suppress the contributions of stepped-frequency range sidelobes (ambiguous peaks) in the estimated range profile, resulting in a cleaner and more accurate radar display.

The invention relates to a laser radar system, belongs to the field of laser radar and laser ranging, and aims to overcome the defects of weak signal, high frequency and complex background noise in a complex environment in the prior art. The laser radar system comprises an optical signal transmitting unit, an optical signal receiving and processing unit, a distance measurement processing unit and a main control processing unit; the main control unit is used for generating a laser trigger pulse signal to the optical signal transmitting unit; the optical signal receiving and processing unit comprises an optical receiver, a trans-impedance amplifier, a primary signal amplifier, a secondary adjustable gain amplifier and an adjustable threshold comparator which are connected in sequence; and the main control processing unit can adjust the power supply voltage of the optical receiver, the amplification gain of the secondary adjustable gain amplifier and the threshold voltage of the adjustable threshold comparator according to the output result of the secondary adjustable gain amplifier. The invention further comprises an optical signal receiving and processing device and an optical signal receiving and processing method. One application of the invention is a laser radar system design.

The invention discloses a radar vibration detection sensitivity calculation method. According to the method, first of all, based on micro vibration target echo signals, a micro vibration phase lead-out vibration detection model is established; secondly, according to the micro vibration phase lead-out vibration detection model, in accordance with average power PS of distance pulse pressure peak signals S when a target is stationary under a noise-free condition and average power PN of a thermal noise component N in slow time echoes composed of distance unit peak points where the vibration target is disposed, thermal noise equivalent average vibration amplitude NEA0 is obtained; based on the micro vibration phase lead-out vibration detection model, according to average power P phi of phase noise, phase noise equivalent average amplitude PEA0 is obtained; and finally, on the basis of NEA0 and PEA0, based on the condition that an output signal-to-noise ration SNRo is greater than and equal to a minimum detectable signal-to-noise ratio SNRmin, sensitivity Smin of vibration detection of a system is obtained. The method can guide design of a vibration detection radar system and evaluate the effect of vibration detection performance of a vibration detection radar.

The invention relates to a distributed all-coherent sparse linear array radar system optimization array method, and aims to solve the problem that the performance of an antenna pattern is deteriorateddue to the fact that an existing sparse array optimization method cannot meet the array optimization requirement of a distributed all-coherent sparse linear array radar. The method comprises the following steps of: on the basis of considering the design and signal processing requirements of a distributed all-coherent radar system, calculating the maximum array aperture, the number requirement ofunit radar array elements and the directional diagram optimization angle of the distributed all-coherent sparse linear array radar system; then, carrying out sparse array optimization for a specific optimization angle domain; and then, screening discrete interference angles for a non-optimization angle area, forming nulls at interference positions by utilizing adaptive beamforming to inhibit interference, and finally outputting an optimized array directional diagram of the distributed all-coherent sparse linear array radar system.

The invention discloses a radar scheme design method based on machine learning, and the method comprises the steps: carrying out the feature extraction of each type of radar scheme performance indexesand corresponding subsystem type indexes through employing a scheme sample, enabling a scheme to be abstracted into sequence data, and carrying out the data preprocessing operation; secondly, training a machine learning model by utilizing the scheme feature sequence, taking a radar overall system performance index in sample data as model input, taking a radar subsystem type index as model output,obtaining an internal node connection weight of the model, and obtaining a network model of scheme feature design; and finally inputting the index parameter characteristics of the to-be-designed scheme into a training module, and finally outputting the type parameters of each subsystem of the radar scheme to complete the radar module-level scheme design work. The invention provides a novel radarscheme design method which can overcome the defects that a traditional radar system is complex in design process and uneven in design level, is low in implementation cost and high in efficiency, and can provide effective reference for radar designers.

The invention relates to systems used for tsunami detection and warning. Systems and techniques are described for tsunami detection and warning using coastal radar systems designed primarily for the real-time mapping of ocean surface currents. These radar systems are configured to detect an approaching tsunami in the system's ''near field'', i.e., the near-shore region over which the radar system observes the sea surface.

The invention discloses a marine active phased array radar, and belongs to the field of radar system design. The marine active phased array radar mainly comprises a radar host and a servo turntable, wherein the radar host mainly comprises an active phased array antenna, a radio frequency processing unit, a digital intermediate frequency unit, a digital processing unit and a power supply unit. The active phased array radar provided by the invention can effectively discover and track far and near distance targets on the sea surface.

The invention provides a low-power-consumption small satellite radar searching and tracking method for a space target. A C wave band is selected as a radar working frequency band. The phased array radar is used for firstly searching an airspace target, distance information of the target is obtained through distance compression, short-time Fourier transform and constant false alarm rate detection, and then angle measurement is carried out on the target by using sum and difference beams. And when the distance and angle information of the target is obtained, the target is tracked. Based on the design of the miniaturized phased array radar system, a signal processing method for target searching and tracking, and distance measurement and angle measurement error analysis, it is obtained that the miniaturized phased array radar can search a 40-degree * 40-degree three-dimensional space target within the range of 25 km, the distance measurement precision of 0.4 m and the angle measurement precision of 0.03 degree are achieved, and therefore, the large-range searching and tracking application requirements of the space target are met.

A long-range FMCW radar with a narrow beam width is realized with a self-developed technology, which is not only used for traffic flow detection, but also for detecting target presence, measuring static target distance and collecting environmental object distribution images, and achieving low-cost and high-performance comprehensive goals. The radar is composed of a microwave front end, an intermediate frequency analog circuit module, and a digital signal processor, and uses a stepped linear frequency modulation continuous wave system. The microwave front end comprises a transmitting antenna and a receiving antenna that have blade beams, and a microwave transmitting and receiving circuit with a power amplifier. In design schemes of the antenna, the receiving and transmitting circuit, an intermediate frequency analog circuit and a radar system, a number of independently created technologies are used, comprising the design of an antenna with minimized discontinuities, the design of a non-equal splitter and a high impedance mixer circuit, an excellent stepped linear modulation signal generator, a new radar time base synchronization method, the optimal bandwidth design for a radar channel filter. A theoretical argument in accordance with the physical sources is given for the stepped linear frequency modulated radar technology, which guarantees a reliable basis for the given design.

The invention belongs to the technical field of electromagnetic property application, and particularly relates to a broadband fast multifunctional signal generation assembly. The broadband fast multifunctional signal generation assembly comprises a frequency multiplication/power division module, a DDS (Direct Digital Synthesis) module and a frequency mixing module, wherein the frequency multiplication/power division module is used for performing frequency multiplication on a reference signal to obtain a clock signal and a local oscillator signal; the clock signal is transmitted to the DDS module; the local oscillator signal is transmitted to the frequency mixing module; an upper computer controls the DDS module to generate a baseband signal with variable bandwidth and wave form; the baseband signal is transmitted to the frequency mixing module; the frequency mixing module is used for performing frequency mixing on the local oscillator signal from the frequency multiplication/power division module and the baseband signal from the DDS module and then outputting. According to the broadband fast multifunctional signal generation assembly, the technical problem that the conventional signal generation equipment can only generate a signal of a specific form is solved. The assembly can output a time sequence control signal, a multifunctional frequency synthesizing function of a radar system can be realized after the assembly is connected with the radar system, and the measuring radar system design is obviously simplified.

The invention belongs to the field of radar system design, and particularly relates to a synthetic aperture radar coherent pulse signal generation method. The method comprises the following steps: step 1, waveform parameters of radar signals in an imaging mode are obtained, the waveform parameters of the radar signals are sent to a signal generation unit, and the signal generation unit receives and stores the waveform parameters of the radar signals; step 2, the signal generation unit detects the frame pulse signal of the timer in real time, and after the frame pulse signal is detected, the signal generation unit generates a PRF signal according to the waveform parameter of the radar signal and the frame pulse signal; and step 3, the signal generation unit generates a coherent pulse signal according to the waveform parameters of the PRF signal and the radar signal, sends the coherent pulse signal to the emission unit, amplifies the coherent pulse signal, and then radiates the coherent pulse signal through an antenna. The stability of the radar imaging function can be greatly improved, the image obtained after radar imaging is good in focusing and free of ghosting, and the radar image quality can be effectively improved.

The invention discloses a multi-channel wide dynamic data adaptive synthesis and health diagnosis method which is mainly applied to radar system data sampling with high dynamic range requirements. In order to realize a high dynamic range and ensure sensitivity, a method of simultaneously sampling by a plurality of channels with different gains and then synthesizing multi-channel data into one channel is generally adopted in the design of a radar system. According to the invention, through methods of adaptive gain correction, inflection point identification based on intermediate frequency sampling, optimal working range and hysteresis comparison channel selection, automatic fault discrimination and removal and the like, high efficiency and reliability of multi-channel data synthesis are ensured.