493 results about "Continuous-wave radar" patented technology

A system and method are provided to reduce the effect of an interfering signal in a radar return signal for a frequency modulated continuous wave (FMCW) radar. Once the interfering signal is detected, an extent of the interfering signal is determined and the data that was corrupted by the interfering signal is not included in the processing of the radar return signal. This allows the radar to detect a target in the presence of the interfering signal. The system and method can benefit any FMCW radar that is within the range of an interfering radar source (e.g. another FMCW radar, a police radar gun, a pulse radar, etc.) operating in the same frequency band as the FMCW radar. An alternative arrangement provides a system and method for determining the frequency of the interfering signal and then avoiding transmitting power in that portion of the frequency spectrum where the interfering signal is present.

A system, method and detection arrangement for investigation of a sample are described. A laser illumination arrangement generates (i) a source laser energy that is incident on a source to cause emission of subcentimeter radiation, at least a portion of which interacts with the sample to serve as a sample influenced radiation incident on a detector and (ii) a detector laser energy that is incident on the detector to produce an optical component of the detector laser energy offset with respect to a corresponding optical component of the source laser energy so that the collective energy at the detector generates an electrical output signal responsive to the sample influenced radiation. In another aspect, a detection arrangement is used with at least two continuous wave lasers for causing the detector body to respond in a way which produces a frequency down-converted signal from an incident electromagnetic radiation.

A system and method are provided to reduce an interfering signal in a radar return signal for a frequency modulated continuous wave (FMCW) radar. Once the interfering signal is detected, an extent of the interfering signal is determined and the interfering signal is removed from the radar return signal. This allows the radar to detect a target in the presence of the interfering signal. The system and method can benefit any FMCW radar that is within the range of an interfering radar source (e.g. another FMCW radar, a police radar gun, a pulse radar, etc.) operating in the same frequency band as the FMCW radar.

In the proposed low complexity technique a hierarchical approach is created. An initial FFT based detection and range estimation gives a coarse range estimate of a group of objects within the Rayleigh limit or with varying sizes resulting from widely varying reflection strengths. For each group of detected peaks, demodulate the input to near DC, filter out other peaks (or other object groups) and decimate the signal to reduce the data size. Then perform super-resolution methods on this limited data size. The resulting distance estimations provide distance relative to the coarse estimation from the FFT processing.

A bi-static continuous wave radar system and related methods for detecting incoming threats from ballistic projectiles includes a remote source of RF illumination, and a local receiver installed in one or more target aircraft. A first receiving channel acquires direct path illumination from the source and provides a reference signal, and a second receiving channel acquires a scatter signal reflected by a projectile. A processor coupled to each receiver corrects scatter signal Doppler offset induced by relative source motion, isolates narrowband Doppler signals to derive signatures characteristic of the projectile, and by executing appropriate algorithms, compares the derived signatures to modeled signatures stored in memory. If the comparison yields a substantial similarity, the processor outputs a warning signal sufficient to initiate defensive countermeasures.

The invention provides a millimeter wave frequency modulated continuous wave (FMCW) two-unit phased array distance and velocity measurement monolithic radar transceiver and belongs to the field of distance and velocity measurement radar transceivers. The millimeter wave FMCW two-unit phased array distance and velocity measurement monolithic radar transceiver is characterized by being formed by a FMCW transmitting module, a two-unit receiving module, a digital control module and a polarization generating module. The FMCW transmitting module is used for generating FMCW continuous-wave modulated signals, the continuous-wave modulated signals are sent out through an antenna after being amplified, the two-unit receiving module is used for processing signals reflected back from a target, the digital control module is used for controlling configurable amount in a system, sweep frequency cycle of FMCW modulation signals, sweep frequency bandwidth, signal transmitting power, gain of a receiving branch, bandwidth of a five-order Butterworth low-pass filter and phase shift value of a phase shifter can be configured, and the millimeter wave FMCW two-unit phased array distance and velocity measurement monolithic radar transceiver can be applied to detection of targets at close distance, far distance and different angles.

A wind turbine blade inspection system includes a frequency modulated continuous wave radar system configured to be movable with respect to a wind turbine blade while transmitting reference microwave signals and receiving reflected microwave signals and a processor configured for using a synthetic aperture analysis technique to obtain a focused image of at least a region of the wind turbine blade based on the reflected microwave signals.

The invention discloses a multi-life monitoring system based on FMCW (frequency modulated continuous wave) wideband radar. The multi-life monitoring system comprises a transmitting unit, a receiving unit, a signal processing unit and a wireless signal transmitting unit; an FMCW signal is transmitted from the FMCW wideband radar to no less than one human object by virtue of the transmitting unit; a reflected echo signal is received by virtue of the receiving unit; the echo signal, which carries vital sign signals, is processed by virtue of the signal processing unit; the vital sign signals are demodulated and separated from the echo signal; and the vital sign signals are transmitted to a computer terminal by virtue of the wireless signal transmitting unit, so that respiration and heartbeat signals of detected persons are monitored under the condition of avoiding contact with the bodies of the detected persons. With the implementation of the multi-life monitoring system disclosed by the invention, under the circumstance of avoiding the contact of any electrodes and sensors with patients, the respiration and heart rates of the plurality of patients can be simultaneously monitored by a long time at a relatively long distance, so that the detected persons can feel more easily and comfortably; the multi-life monitoring system can be widely applied to clinical dynamic monitoring and sleep quality monitoring of patients with severe burn and the like; and meanwhile, the multi-life monitoring system can be also applied to researches in the field of psychology.

Disclosed herein is a frequency modulated continuous wave (FMCW) radar device, including: a continuous wave (CW) signal generator configured to generate a transmit (Tx) CW signal; a radio frequency (RF) transmitter configured to transmit the generated Tx CW signal as an RF signal through a Tx antenna; an RF receiver configured to receive a CW signal which is reflected and returned from a forward object after the Tx CW signal is transmitted; a target detector configured to extract speed and angle using a frequency difference between the Tx CW signal and the reflected CW signal, and detect an approaching target; and a detection controller configured to control the RF transmitter to transmit the Tx CW signal as a signal having a triangular waveform in a time-frequency graph and to additionally transmit the Tx CW signal as a signal having a crossbar waveform at a predetermined frequency for a predetermined time, and extract speed and angle from the reflected CW signal having a crossbar waveform so as to detect the approaching target, when the sign of the target speed extracted from the reflected CW signal having a triangular waveform is negative (−).

The present invention relates to system for detecting obstacles (13, 55, 56, 57) on the ground (15) onboard a carrier (1). The detection system comprises at least two continuous-wave radars (2, 3, 4). The radars (2, 3, 4) are linked to a system (15) for utilizing the detection data arising from the radars (2, 3, 4). The detection system performs localization of an obstacle (13, 55, 56, 57): along a radial axis (12) between a radar (2, 3, 4) and the obstacle (13, 55, 56, 57), by calculating the distance between the radar (2, 3, 4) and the obstacle (13, 55, 56, 57); along a vertical axis (14) with respect to a radar (2, 3, 4), by calculating the elevation of the obstacle (13, 55, 56, 57) using monopulse deviation-measurement processing; The detection system performs localization of an obstacles along a horizontal axis (18) transverse with respect to a sighting axis (11) of a radar (2, 3, 4), by calculating the azimuthal position of the obstacle (13, 55, 56, 57). The invention applies notably in respect of the detection of obstacles on the ground so as to avoid any collision between a taxiing aircraft and these obstacles.

The invention provides a continuous wave radar feed-through nulling system and a continuous wave radar feed-through nulling method. The system comprises an antenna device, a transmitting channel, a receiving channel and a signal processor, wherein the antenna device consists of a transmitting antenna and a receiving antenna; the transmitting channel consists of a filter and amplifier module, an up-conversion module and a power amplifier; the receiving channel consists of a low-noise amplifier, a down-conversion module, a filter and amplifier module and a quadrature dDemodulation module; and the signal processor comprises an analog signal conditioning unit circuit and a digital signal processing unit circuit. In the invention, through the sampling of an orthogonally demodulated signal and the real-time self-adaptive nulling of the signal, feed-through signals are prohibited and the measurement accuracy of the system is improved. Meanwhile, the video nulling system provided by the invention also has the characteristics that: the scheme is simple; the implementation is easy; and the like.

A laser device for treating skin is provided which includes a handholdable housing; a continuous wave laser member arranged within the housing emitting an output beam; a user activated output switch system including a power activating button for arming the device and a power setting button to fire a single first pulse of output beam and after a pause in succession a second pulse of output beam, the second pulse being automatically programmed to fire after the first pulse and pause; and a lens array for receiving the output beam and transmitting the beam through a prism splitting the beam into multiple beamlets, each beamlet targeting a specific spot on the skin, and wherein beamlets from the first and second pulses successively strike the specific spot reinforcing energy applied to the specific spot.

The invention relates to an automobile anticollision radar system based on frequency-modulated continuous wave (FMCW) and belongs to the technical field of automobile protection. The system can measure the distance and velocity of a target and effectively avoid car crashes. The system comprises the following components: a radar sensor, a filter, an automatic gain control amplifier, an analog-to-digital converter, a digital signal processor and a corresponding early-warning device. The radar sensor collects signals including leaked modulation, intermediate-frequency and high-frequency signals; the filter filters off the leaked modulation waves and high-frequency component; in the digital signal processor, the spectral analysis is performed by means of FFT and the frequency measurement results are converted into distance information and velocity information; and different warning modes are adopted according to the measurement results. The maximum acceptance range of the system can reach 150 m, the distance discrimination is 1 m, the velocity discrimination is 1 m / s, and the working environment is -40 DEG C to -80 DEG C.

A method for the linearization of frequency modulated continuous wave (FMCW) radar devices having non-linear, ramp-shaped, modulated transmitter frequency progression x(t). With this invention, a correction phase term for compensation of the phase error in the reception signal q(t) is calculated on the receiver side in this device.

This invention relates to one complete phase time displacement different frequency spectrum correction method, which measures the signal frequency rate, phase bit, range value parameters with high accuracy to make phase meter, frequency meter and spectrum analyzer, laser distant devices. The invention adopts technique key by use of whole phase FFT frequency spectrum analyze method for two existent lag relationship frequency spectrum to correct the analyze results by time displacement difference method and two time phase spectrum analyze results.

A far field radio frequency identification (RFID) tagging and tracking system employing a plurality of continuous wave (CW), unmodulated signals selected from frequencies including a predetermined frequency band, includes a RFID interrogator generating a group of CW unmodulated signals corresponding to a RFID tag and receiving a tag identification (ID) signal sequence uniquely identifying the RFID tag, while the RFID tag includes a power source supplying power to the RFID tag but not including a microprocessor. A corresponding RFID tag and method for operating both the tag and the system are also described.

The invention discloses a small FMCW-based (frequency modulated continuous wave) SAR (synthetic aperture radar) imaging system by using an FPGA (field programmable gate array) to mainly overcome the disadvantages of large volume, heavy weight and high power consumption of the traditional SAR imaging system. The small FMCW-based SAR imaging system comprises a radar front end, an acquisition preprocessing unit, a signal processing unit and a receiving host, wherein the acquisition preprocessing unit comprises an instruction communication module, an A / D (analogue / digital) acquisition module, an FPGA control and calculation module and a data sending interface; the signal processing unit comprises a data receiving interface, an FPGA control module, a DSP (digital signal processor) calculation module and a data sending interface; the acquisition preprocessing unit and the FPGA of the signal processing unit are used for receiving back waves and inertial navigation parameters of the radar front end, feeding back the regulation instruction to the radar front end to perform distance pulse pressure, transmitting data to a DSP, receiving the calculation results of the DSP and transmitting thecalculation results of the DSP to the receiving host for display. According to the small FMCW-based SAR imaging system, one picture can be imaged in real time in one second under the airborne condition, the small FMCW-based SAR imaging system has the advantages of small size, light weight, small power consumption and good reliability and can be applied to the fields of radars, guided missile, remote sensing, etc.

The invention relates to an automobile active anti-collision radar based on pseudorandom code and linear frequency modulated continuous wave, belonging to the field of automobile radar, comprising a pseudorandom code and linear frequency modulated control signal generator, a pseudorandom code and linear frequency modulated continuous wave emitter, a sending antenna, a receiving antenna, a low-noise amplification mixed frequency receiving channel, a linear frequency modulated signal processing and pseudorandom code multi-path parallel correlation processor, a parallel data processor and an executing terminal. The pseudorandom code is used for modulating the phase of radar carrier wave and performing linear frequency modulation to the radar carrier wave so as to form a double-modulation emitting signal. Two systems are combined, so that the inhibition ability of interference echo is improved; the false alarm caused by false targets is removed; different codes of different automobile radars are achieved; the interference caused by the automobile radar is removed; the detection ability of the active anti-collision radar is improved; the false alarm rate is improved; and the inhibitionability under complex road condition is good.

The invention discloses a multi-target displacement high-accuracy measurement method and system based on microwave radar. The frequency measurement technology of frequency modulation continuous wave radar and the phase measurement technology of single-frequency continuous wave interferometer radar are fused together through the specific system structural design, and multi-target recognition and high-accuracy displacement measurement are achieved at the same time according to frequency estimation and phase measurement respectively. The FMCW radar and the CW radar are fused together, so that the advantage of multi-target recognition of the FMCW radar and the advantage of high-accuracy measurement of the CW radar are achieved at the same time; compared with FMCW / CW radar in a software configuration mode, mode switches are not needed for measurement, waveform modulation and other additional operation with special requirements are not needed, and multi-target displacement high-accuracy measurement can be finished in real time at the same time.

The invention discloses a non-contact life sign monitoring system. Continuous wave radar is mainly adopted to detect a life sign signal of a human body. According to the system, firstly continuous wave of a fixed frequency is emitted to a to-be-detected life body by a radar signal emission unit, secondly multiple paths of generated orthogonal life sign signals are collected by an analog receiving unit, then a digital down-conversion unit is used for extracting a useful signal in high and medium frequency signals, the signal is divided into multiple paths by orthogonal demodulation, finally information of multiple paths of baseband signals is extracted through a digital signal processing unit, each path of life sign signal is separated by using an adaptive filter, and frequency extraction of the signal is performed by using fourier transform. The system is convenient to use and accurate in measurement, and has good anti-interference capacity; high-precision life sign data can be acquired without touching the life body during use, so convenience is brought to related personnel to accurately and continuously master the life sign situation of a tested person in real time.

A time needed until measurement values are obtained in a two-frequency continuous wave radar systems is reduced. A target object detection system (1) that emits to target objects transmission signals (22), as transmission waves (23), whose frequencies have been modulated successively into a plurality of stepped frequencies, and receives echoes (24) of the transmission waves (23) reflected from the target objects, thereby to calculate relative velocities of the target objects by frequency-analyzing reception signals (25) obtained from the received echoes (24). The target object detection system (1) includes: a frequency modulation means (2) that executes a plurality of times frequency-modulation processes to successively modulate the transmission signals (22) into those of the stepped frequencies, within a minimum measurement time in which a desired velocity resolution is achieved; and a frequency-analysis means (6) that frequency-analyzes throughout the plurality of frequency-modulation processes the reception signals (25) obtained by receiving the echoes (24) of the transmission signals (22) modulated into those of an identical stepped frequency in the plurality of frequency-modulation processes iterated by the frequency-modulation means (2).

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 discloses an SAR (synthetic aperture radar) real-time imaging method based on a frequency modulated continuous wave, and the problem that a conventional method cannot process the real-time echo data of the frequency modulated continuous wave is mainly solved. The SAR real-time imaging method comprises the following realization steps of: carrying out previous wave filtration on initial data; carrying out Doppler center estimation, walking correction and Doppler center translation on the data subjected to the previous wave filtration; carrying out inverse fast Fourier transform (IFFT) on the data subjected to the center translation along a distance direction; carrying out Doppler frequency modulation rate estimation on the data subjected to the IFFT to obtain a frequency modulation rate value; calculating the motion error parameter of a loader according to the frequency modulation rate value; carrying out motion compensation on the data subjected to the previous wave filtration according to the motion error parameter; carrying out the walking correction, the Doppler center translation and bending correction on the data subjected to the motion compensation; carrying outthe frequency modulation rate estimation on the data subjected to the bending correction; and carrying out focusing and imaging on the data along an azimuth direction according to the obtained frequency modulation rate value to obtain an SAR image. The SAR real-time imaging method has the advantage that the SAR imaging resolution is high, and can be applied to the processing of the real-time echodata of the frequency modulated continuous wave.

The invention discloses a fully-coherent continuous-wave Doppler radar and a distance measurement and velocity measurement method thereof. According to the fully-coherent continuous-wave Doppler radar and the distance measurement and speed measurement method thereof, difference-frequency complex signals obtained by mixing echo signals and transmitted signals are acquired; according to the modulation characteristics of distance difference-Doppler frequency and target distance-velocity, a distance-dimension FFT and azimuth-dimension MTD-combined two-dimensional joint detection method is adopted to independently obtain fuzziness-free radial velocity information based on a plurality of coherent high-repetition frequency modulation signals; Doppler information introduced by velocity is removed from the frequency-domain information in the distance dimension, so that the influence of distance-velocity coupling can be eliminated, and therefore, accurate distance information can be obtained. The fully-coherent continuous-wave Doppler radar and the distance measurement and velocity measurement method thereof of the invention have coherent radar velocity measurement function and a continuous-wave radar distance blind zone-free distance measurement function and can satisfy requirements for distance blind zone-free and simultaneous distance measurement and velocity measurement, real-time performance, miniaturization and low power consumption.

The present disclosure relates to a radar device and technique for detecting the presence of objects located in the near-field of a frequency modulated, continuous wave (FMCW) radar device. The technique includes transmitting and receiving a frequency modulated signal, generating an intermediate frequency signal based on the transmitted and received signals, and analyzing the frequency content of the intermediate frequency signal. The frequency content of the intermediate signal is analyzed without filtering out a carrier signal.

The invention discloses a method and a system for performing moving-target identification by using a frequency-modulated continuous-wave radar. The method comprises the following steps of: acquiring difference frequency and modulation signals according to a radar signal at the current moment; acquiring distance information according to the difference frequency signal, wherein the distance information comprises a plurality of distance points and an amplitude value corresponding to each distance point; acquiring a Doppler frequency at the current moment according to the modulation signal; judging whether a moving target exists according to the Doppler frequency at the current moment; averagely processing background data to acquire background distance information; acquiring modified distance information by comparing the distance information at the current moment and the background distance information at the current moment; acquiring a moving target identification result by comparing the modified distance information and a threshold; and updating the background data by virtue of the distance information at the current moment when the moving target does not exist. According to the method and the system, the probability of mistaken reports can be reduced, and the accuracy of target identification is effectively improved.