162results about How to "High range resolution" patented technology

The invention discloses a method and a device for vehicle passive keyless entering, starting and locking based on ultra-wide band. The device comprises a vehicular key, a master controller, a door lock sensor, a starting / stopping button, a seat sensor and a vehicular body antenna array, wherein the door lock sensor, the starting / stopping button, the seat sensor and the vehicular body antenna array are all connected with the master controller through a vehicular body circuit. The method includes: using UWB (ultra-wide band) signals to precisely position the vehicular key, detecting the position of the vehicular key and the position information of personnel in the vehicle according to each trigger action of a driver, and using a joint judgment method to control operation of a vehicular door lock, a starting system and an alarming system. In addition, the vehicular key is capable of recording and storing information interested by the driver and vehicular dynamic information. Using the method and the device can better avoid accidents caused by misjudgment of the master controller or misoperation of personnel.

A semiconductor range-finding element and a solid-state imaging device, which can provide a smaller dark current and a removal of reset noise. With n-type buried charge-generation region, buried charge-transfer regions, buried charge read-out regions buried in a surface of p-type semiconductor layer, an insulating film covering these regions, transfer gate electrodes arranged on the insulating film for transferring the signal charges to the buried charge-transfer regions, read-out gate electrodes arranged on the insulating film for transferring the signal charges to the buried charge read-out regions, after receiving a light pulse by the buried charge-generation region, in the semiconductor layer just under the buried charge-generation region, an optical signal is converted into signal charges, and a distance from a target sample is determined by a distribution ratio of the signal charges accumulated in the buried charge-transfer regions.

The invention discloses an atmospheric detection laser radar based on a superconducting single-photon detector. Optical pulse emitted by a laser pulse generation unit points to a detected atmosphere through a transmitting telescope and a laser scanning unit, background noise of an atmospheric echo signal is filtered out by an optical preprocessing unit, an optical processing unit extracts atmospheric information, a superconducting single-photon detection unit detects the atmospheric echo signal, a data acquisition card collects the signal, and finally, a subsequent data inversion and display unit inverts and displays atmospheric parameter information. The atmospheric detection laser radar of the invention is different from the existing atmospheric detection laser radar in that the atmospheric detection laser radar of the invention uses a superconducting single-photon detector with low dark count, high quantum efficiency, wide wavelength response and low time jitter as a detection unit. By using the superconducting single-photon detector, the atmospheric detection laser radar has the advantages of high spatial resolution, high temporal resolution, large detection distance, high detection precision, and the like.

The invention relates to a meteorological radar system based on continuous wave system and a control method, wherein the system comprises an emission extension which is used to receive a linear frequency modulation continuous wave signal from an extension and obtain a continuous wave emission signal after amplification processing, and output the signal to an emission antenna module; a reception extension which is used to output the linear frequency modulation continuous wave signal to the emission, receive a meteorological echo signal from an antenna module, and output the signal to a digital processing extension after frequency conversion amplification processing; an emission antenna module, which is used to emit the continuous wave emission signal; a reception antenna module, which is used to receive the meteorological echo signal; and a digital processing extension, which is used to receive the signal from the extension and process it to obtain the meteorological data information and perform instruction control to the radar system state at the same time. According to the continuous wave system, the emission signal employs continuous wave signal, which has a higher distance resolution compared to a pulse system radar, therefore the meteorological radar system is especially suitable for refined meteorological detection.

The invention relates to a system utilizing CMMB (China mobile multimedia broadcasting) signals to detect a target and a method thereof. The system comprises a receiving antenna, an analog chassis with a signal simulating and receiving component, a CPCI (compact peripheral component interconnect) chassis with a signal acquisition and processing component, at least one disc array chassis with a signal storage component, a switchboard and a signal process for signal processing, which are connected in sequence. The analog reception adopts a scheme of secondary mixed frequency and fixed medium frequency; the data acquisition adopts a scheme of medium-frequency bandpass sampling and digital down-conversion; the data storage adopts a high-speed disc array; and the data processor is used for implementing such operations as signal reconstruction, channel correction, direct wave suppression, digital beam formation, inter-ambiguity function, peak detection, constant false alarm detection, positioning and tracking and the like, and final output of information of the target distance, speed and direction. The system has the following advantages of no need for frequency distribution, no electromagnetic pollution, high signal randomness, high signal interception performance, large signal bandwidth, high distance resolution, low research and maintenance cost, and high mobility.

The invention relates to a life detection radar device, in particular to an ultra-wide bandwidth microwave chaos life detection radar device for detecting human body life feature information and distance information. The ultra-wide bandwidth microwave chaos life detection radar device can be used for disaster rescue and comprises a first signal generator, a first power splitter, a frequency mixer, a power amplifier, an ultra-wide bandwidth emitting antenna, an ultra-wide bandwidth receiving antenna, a low noise amplifier, an I / Q demodulator, a second signal generator, a second power splitter, a voltage-controlled phase shifter, an adjustable attenuator, a solid state microwave sensor, a third signal generator, a phase-locked amplifier and a signal collecting and processing module. The life feature information and the position information of trapped persons can be rapidly and accurately detected.

The invention discloses an indoor human body posture recognition method based on weighted combined distance time frequency transformation, and the method comprises the steps: firstly carrying out the MTI filtering of indoor human body posture data recorded by a UWB (ultra wide band) radar, extracting the data comprising the body posture, and selecting an effective distance gate; secondly obtaining a combined distance time frequency distribution map through the weighted combined distance time frequency transformation, and extracting the feature parameters of a body envelope in the map; thirdly determining the mapping relation between different postures and the feature parameters through a machine learning algorithm; finally determining the class of body posture according to the obtained mapping relation. The method is effective and feasible, is reliable in performance, and can accurately recognize different indoor body postures.

The embodiment of the invention relates to the technical field of laser detection, and discloses a laser radar, a control method thereof and an automatic driving device. The laser radar comprises a first transceiving module for transmitting first exiting laser and receiving first reflected laser; a first scanning module for deflecting the first exiting laser and for receiving the first reflected laser, deflecting the first reflected laser and emitting the deflected laser to the first transceiving module; a beam expanding module for expanding and collimating the first exiting laser passing through the first scanning module and emitting the first exiting laser to a first detection area, and for converging the received first reflected laser in a beam shrinking manner and emitting the first reflected laser to the first scanning module; a second transceiving module for transmitting second exiting laser and receiving second reflected laser; and a second scanning module for enabling the second exiting laser to emit to a second detection area, and for receiving the second reflected laser, deflecting the second reflected laser and emitting the second reflected laser to the second transceiving module. Through the mode disclosed by the embodiment of the invention, the ranging capability of the laser radar is improved.

The invention discloses a microwave differential gain-based coherent Doppler wind lidar. According to the technical scheme of the invention, a balanced detector is connected with a bandpass filter, so that invalid signals, away from the Doppler frequency shift, are filtered and eliminated. A pre-amplifier is adopted to amplify an electrical signal outputted by the detector. Meanwhile, a power divider is adopted to divide amplified electrical signal into a monitoring channel and a detection signal. The detection signal is filtered by a pre-emphasis filter. The frequency-domain change of the detection signal is converted to the intensity change of the signal. Through the comparison with the monitoring channel and the transmittance curve of the pre-emphasis filter, the Doppler shift information is obtained. The interference of invalid echo signals is reduced. By adopting the pre-emphasis filter, echo signals are subjected to frequency discrimination, so that the computation amount of signal processing is reduced. The sensitivity and the signal-to-noise ratio of the system are improved. The coherent Doppler wind lidar is higher in resolution distance.

A micro manipulator for electrode movement, a driving method thereof, and a brain signal measuring device using the same are provided. The micro manipulator has a guide member having a rectangular hollow hole therein, first and second piezo-electric clamp bodies installed perpendicular to the movement direction of the electrode between the inner opposite sides in the hollow hole of the guide member such that respective both ends thereof are selectively fixed to or separated from the inner sides of the hollow hole depending upon whether of the application of electric power thereto, a drive piezo-electric body whose both ends are connected to the opposite faces, respectively, of the first and second clamp piezo-electric bodies to selectively expand or contract in parallel with the movement direction of the electrode depending upon whether of the application of electric power thereto, and an electrode holder holding therein the electrode and installed on the first or second clamp piezo-electric body in parallel with the expansion or contraction direction of the drive piezo-electric body.

The invention relates to an apparatus for remote monitoring physiological parameters, comprising: a radar transmitter for transmitting radio frequency signal towards a human body; and a radar receiver for receiving frequency signals reflected from a human body. An accelerometer is adapted to be placed on a human body, and a signal processor, which is configured for extracting and processing physiological parameters of the at least one human body from the inputted signals of the receiver and accelerometer. A specific embodiment of the apparatus relates to a radar and a wireless communication channel controller for receiving data from patients. Patients have accelerometers attached to their bodies and the patients can be without motion or move freely within a room. For each patient, the device determines breathing and pulse rate; cardiac performance and the patient identification by automatically setting up a match between the determined parameters and each patient's ID.

The invention discloses a time division ground-based MIMO landslide radar imaging method based on IFFT and mix-match pursuit, and aims to solve the problems that an existing mountain landslide monitoring field imaging method is high in data processing complexity and uses too many antennas; aiming at a multi-target imaging pseudo shadow point problem, the method introduces the mix-match pursuit algorithm, thus greatly improving the imaging quality; the method comprises the following steps: building an equivalent random sparse transmit-receive array; building an echo signal acquisition model; range direction compression treatment; azimuth compression treatment; finishing two dimension object high resolution imaging. The advantages are that the method can reduce the array quantity, can reducehardware cost, can reduce the data processing complexity, and can improve the range and azimuth resolutions.

The invention discloses an ultralow sidelobe synthetic aperture radar imaging method based on a complete complementary sequence. The ultralow sidelobe synthetic aperture radar imaging method includes steps of 1, dividing echo data based on signal waveforms of the complete complementary sequence into echo data which are obtained by means of utilizing two complementary sequences as radar transmitting signals independently; 2, compressing range pulses based on matched filtering; 3, performing azimuth Fourier transformation; 4, correcting range migratory motion; 5, performing azimuth data high-frequency zero fill; 6, shifting and adding the data after zero rill; and 7, performing azimuth compressing to obtain a final image. The ultralow sidelobe synthetic aperture radar imaging method has theadvantages that radar signal waveforms are easy to be generated, pulse compressing is easy to be realized, azimuth ultralow sidelobe is realized, and azimuth resolution and image quality are high.

The invention provides a liquid crystal phased array-based laser radar system, and relates to the technical field of laser phase control. By the liquid crystal phased array-based laser radar system, the problem that incident light and emergent light are separated by a light splitter in an existing light path and the light intensity loss can be caused by introduction of the light splitter so that the application of a beam deflection system is limited are solved. The liquid crystal phased array-based laser radar system comprises a central processing unit, a laser emission system and an echo receiving system, wherein the laser emission system comprises a laser A and an emission light path, the emission light path comprises a beam expansion collimation system A, a refined deflection system, aone fourth wave plate and a rough deflection system, the refined deflection system comprises a one second wave plate, a liquid crystal spatial light modulator (LCSLM) and a DSP controller, the rough deflection system comprises a liquid crystal polarization rotator, a liquid crystal spatial light modulator (LCPG) and a polarization grating controller, and the echo receiving system comprises a fieldprogrammable gate array (FPGA), an MPPC and a receiving light path. An oblique incidence mode is employed, an included angle between light irradiating the liquid crystal spatial light modulator and emergent light is increased, the light path is simplified, the system volume is reduced, the light intensity loss caused by the light splitter is also reduced, and the application range of the liquid crystal spatial light modulator is expanded.

The present invention discloses a coherent laser radar system of high-resolution measurement of a remote object. The system comprises a narrow linewidth seed light source, a double parallel phase modulator, a radio frequency signal source, a fiber beam splitter, an acoustic optical modulator, a collimator, a polarized light beam splitter, a quarter-wave plate, an optical antenna, a 2*2 fiber optic combiner, a balance detector and a signal processing module. The coherent laser radar system of high-resolution measurement of remote object can perform high-resolution measurement of the distance and the speed of the remote object. The coherent laser radar system of high-resolution measurement of remote object is high in detection sensitivity, high in distance resolution, high in speed resolution, has a laser all-fiber structure and the output line polarization high peak power laser, and has a wide application prospect in the national defense and civil detection fields.

The invention discloses an ultra wide band microwave photon long-distance range radar device based on chaos laser. The ultra wide band microwave photon long-distance range radar device based on chaos laser is characterized in that an ultra wide band chaos signal is used as a radar detection signal; the radar detection signal is transmitted via a long single mode fiber, is converted into a corresponding electric signal at a long-distance antenna terminal and is transmitted via an ultra wide band antenna; a detection signal is received by the ultra wide band antenna of the same model after being reflected when meeting a space target part; the laser is subjected to linear modulation, the signal is converted into a corresponding optical signal and is then transmitted via the single mode fiber to return to a center station; data processing is carried out in the data processing center to obtain and display target distance information; and therefore, the space precise positioning of the long-distance target is realized. The ultra wide band microwave photon long-distance range radar device based on the chaos laser is used for monitoring the military radar, the radar system on the mountain top and the island with severe environment and the industrial areas with severe or dangerous environment in real time.

The invention relates to a device for measuring a material surface by using a blast furnace based on an MIMO radar. The device is a set of system composed of an MIMO radar, antenna arrays, an antenna protection casing, a cooling blowing unit and the like. Three-dimensional information of a whole bacterial surface in the blast furnace is obtained by using sparse array high resolution characteristics of the MIMO radar and a near field high resolution imaging algorithm, costs of electronic control scanning array imaging radars are decreased greatly simultaneously, and on-line dynamic monitoring capacity of three-dimensional material surfaces under bad conditions of industrial sites is provided by a dust and high temperature resistance technology.

The invention discloses a continuous wave radar through-wall detection system comprising a radar head device and a plurality of display devices. The system is characterized in that a millimeter-wave transceiver module, a transmitting antenna and a receiving antenna are arranged on the radar head device. The millimeter-wave transceiver module includes a transmitting part and a receiving part; the transmitting part contains a sweeping frequency source, a coupler, and a power amplifier, wherein the sweeping frequency source, the coupler, and the power amplifier are successively connected; and the receiving part includes a low-noise amplifier, an image rejection mixer, a band rejection filter, an intermediate-frequency matching filter and a hand-operated gain control circuit. And the display devices receive images and data from the radar head device by a wireless transmission module. According to the invention, because of multiple display devices, a target can be detected by the user at different positions. The detection radar with the millimeter-wave frequency-modulation continuous wave system can meet requirements of high-resolution imaging and target identification of through-wall detection; and a saturated phenomenon during short-distance target detection by the radar can be avoided.

The invention provides a method for measuring ocean wave parameters based on sea coherent radar, and relates to a method for measuring ocean wave parameters. The invention aims to solve the problem that the obtained parameter precision is low based on the large calculation complexity of non coherent radar. The method comprises the following steps of: step 1, reconstructing a sea surface wave height field by using the radial velocity of the wave; step 2, performing sub-image selection and standardization on the reconstructed sea surface wave height field sequence; step 3, performing a three-dimensional Fourier transform on the reconstructed sea surface wave height field sub-image sequence to obtain a three-dimensional wave spectrum; step 4, high-pass filtering the three-dimensional wave spectrum to remove noise; step 5, bandpass filtering a three-dimensional wave power spectrum after the noise is removed, again removing the noise, and obtaining a three-dimensional wave spectrum relatedto the ocean wave; step 6, performing frequency dimension integration on the obtained the three-dimensional sea wave spectrum related to the sea waves to obtain a two-dimensional wave direction spectrum; and step 7, obtain the wave parameters according to the two-dimensional wave direction spectrum. The method is used for the field of measuring the sea coherent radar.

The invention discloses a radar system for detecting a small target on the sea, and relates to the field of radar equipment. The system comprises a frequency synthesizer, a transmitter, a receiver, asignal processor, a display control combination, an antenna, and a servo device. The objective of the invention lies in providing a navigation radar of a solid coherent system. The radar employs a powerful signal processing means for a large-time-width bandwidth product chirp signal, so the radar is long in detection distance, is high in distance resolution and is strong in clutter inhibition capability. The radar also employs a combined pulse form of wide, medium and narrow pulses in the same pulse repetition period for achieving the simultaneous measurement of a full-range target with a small detection distance blind area.

The invention discloses a digital audio broadcasting passive radar system target detection system and method. The system comprises a signal receiving unit, a signal processing unit and a terminal display unit. The signal receiving unit comprises an antenna module, an analog receiver and a digital receiver and is used for receiving and acquiring a FM frequency-band digital audio broadcasting CDR signal operating in an analog-digital hybrid mode or a pure digital mode. The signal processing unit comprises an analog-to-digital separation module, a CDR processing module, an FM processing module and an analog-digital fusion module, and is used for realizing target detection and fusion in the analog-digital hybrid mode or the pure digital mode. The terminal display unit is used for displaying a synchronization peak, reference signal reconstruction quality, a clutter suppression effect, and a target information fusion result. The system and method are applicable to the CDR analog-digital hybrid mode or the pure digital mode, have wide coverage, high distance resolution, and good low-level coverage performance, and have an effective detection and analysis capability for moving objects.

This disclosure provides an underwater detection device, which includes a first generator for generating a first transmission signal, a second generator for generating a second transmission signal having a longer pulse width than that of the first transmission signal, an output unit for outputting the transmission signals generated by the first and second generators to a transducer for transmitting underwater ultrasonic waves based on the first and second transmission signals, respectively, receiving the reflection waves caused by the ultrasonic waves, respectively, and converting the reflection waves into a first reception signal and a second reception signal, respectively, an underwater detector for detecting at least one of a presence of a target object and a water bottom depth based on the first reception signal, and a bottom sediment discriminator for discriminating a water bottom sediment type based on the second reception signal.

A signal generating method for a radar system includes generating a first chirp signal and a second chirp signal having a first time delay relative to the first chirp signal; and combining the first chirp signal and the second chirp signal to determine a frequency modulated signal, wherein the first chirp signal and the second chirp signal are N-step linear stepped frequency modulated continuous waves having the same frequency modulation bandwidth, such that the frequency modulated signal includes i steps of the first chirp signal in a first duration, an interleaved combination of N−i steps of the first chirp signal and N−i steps of the second chirp signal in a second duration, and i steps of the second chirp signal in a third duration.

One laser radar which is used for the measuring the wind field as a pilot balloon is microwave modulating. including the system of the pulse laser and extending-string mirror; the receiving system including the telescope , optical fiber, narrow-cut filter; the frequently system is made up of the light-sensitive detector and the telescope; the data handling system is composed of the analog digital transmitting setting, the computer, the software modulation of amplitude of nanosecond pulse the laser radar, the Doppler shift of the scattering of the air molecule and the gas-solid is achieved by the microwave frequency. Compared with the measuring wind laser radar, the invention keep the good points of the directivity of the laser radar room, the high standard of the distinguishing ability .the intimation of the sending wave-length, is adapt to the different requirements of the aircraft and military. Pulse modulation improves the signal to mask radio greatly. The sending of laser radar and the frequency of technical methods own the advantage of both the laser radar and microwave radar, countering the balance of the disadvantage of the present technology, the invention means a lot to the development of laser radar and the popularization of it in our country.

An in-vehicle pulse wave radar device is required to detect an object in a wide range of several tens of centimeters to several tens of meters and therefore the receiving circuit requires an amplification circuit having a wide dynamic range covering the receiving pulse waves of both a large signal level and a small signal level. The pulse wave radar device according to the invention controls the amplification degree of the receiving circuit downward at the time of measuring an object at a short distance immediately after transmission of the transmitting pulse wave and upward with time for measuring an object at a long distance by increasing the amplification degree of the receiving circuit progressively with the elapse of time after transmission of the transmitting pulse wave.