35results about How to "Good anti-interference characteristics" patented technology

The invention discloses a generating and compression method for multi-frequency-scan radar signals. The generating method for the multi-frequency-scan radar signals is provided based on the idea that power density of signals on a time frequency domain is reduced as mush as possible. A single frequency scan signal circumferential displacement and stacking method is utilized to generate time frequency simultaneous multiplex frequency scan signals, the multi-frequency-scan signals are generated, and frequency-scan signals are multiplexed simultaneously in time and frequency in one single pulse time period. The multi-frequency-scan signals of frequency multiplexing are utilized to conduct matched filtering, subsection accumulation is then conducted to obtain distance resolution in negative proportion with bandwidth and signal to noise ratio of a single compressed frequency-scan signal under same energy condition, and secondary compression of the multi-frequency-scan signals is achieved. The signals generated by the methods have high spectrum efficiency and low intercepted probability, and distance resolution and detection distance of the radar are guaranteed.

The invention relates to the research field of the road traffic safety, which discloses an integrative monitoring system of the automobilism action of a driver. The integrative monitoring system comprises a CAN bus, a server, a microwave radar distance measurement module, an infrared laser scanning module, a braking pedal stroke measurement module, a steering wheel turn angle test module, a vehicle motion state measurement module, a driveway identification module, a driver eye motion measurement module and an environmental monitoring module, wherein the server is hung and connected on the CANbus, and the driver eye motion measurement module and the environmental monitoring module are respectively accessed into the server by network lines.

A beacon layout and image processing method based on UAV pose calculation. Firstly, the machine vision-guided landing of UAV is designed. According to the built visual imaging system, the image sensitivity is ensured and the field of view distortion is analyzed. Under certain conditions, combined with the possible poses during the landing process, design the beacon structure and layout method required for the vision-guided landing. Then, according to the designed vision-guided system, for different cooperative beacon configurations, three measures are proposed. The index of algorithm applicability is used to evaluate and screen the pose calculation algorithm. Finally, the ground cooperation beacon used is infrared LED. The imaging effect of infrared LED is more stable, the imaging distance is longer, and the imaging accuracy is higher. This method is simple and easy to implement, has low requirements on the configuration of the landing site, is more convenient and faster to extract features from near-infrared images, expands the scope of application of the vision system, and can detect and identify all-weather and all-weather; Machine attitude information.

The invention proposes an intensity grading system and method based on partial discharge of electrical equipment. The system of the invention includes multiple optical signal transmission units, multiple signal conditioning units, multiple data acquisition cards and data terminals. The method of the present invention utilizes the switchgear to establish a three-dimensional coordinate system, and the length, width and height of the switchgear coincide with the axes of the three-dimensional coordinate system respectively; the collimating mirror probes in a plurality of optical signal transmission units are divided into multiple groups, and placed symmetrically ; through the corresponding optical signal transmission unit, signal conditioning unit and data acquisition card to collect the real-time voltage digital signal converted from partial discharge radiation ultraviolet light and transmit it to the data terminal; the data terminal counts the number of pulses of the real-time voltage digital signal and performs weighting For calculation, the high-voltage partial discharge source is placed inside the switch cabinet and multiple levels of discharge power are set to construct a pulse array matrix, and the intensity classification of partial discharge is established through the pulse array matrix and multiple levels of discharge power.

The invention discloses a DLP signal receiving system suitable for laser radar and an adaptive adjustment method thereof. A laser transmitter emits a laser signal through a laser scanning mirror to form a laser scanning area, and a DLP signal receiver controls the laser scanning area. Scanning points for signal acquisition, the DLP signal receiver includes a plurality of DLP micromirrors arranged in an array, and the laser reflection signal of each scanning point is tracked by more than one corresponding DLP micromirror in the array of DLP micromirrors and receiving; the laser transmitter is integrated with the DLP signal receiver, or the laser transmitter is adjacent to the DLP signal receiver; the DLP micromirrors arranged in an array are used to track and receive the laser radar synchronously The laser reflection signal in the scanning area controls the deflection of the DLP micromirror array to synchronize with the lidar scanning, and selectively projects the area imaged by the scanning target reflection signal to the photoelectric sensor, thereby improving the signal of receiving the laser reflection signal in the scanning area of ​​the lidar Noise ratio, while achieving better anti-interference characteristics.

The present invention relates to a multi-scale compressive sensing progressive encoding method with priority of interest region, comprising the following steps: performing ROI detection on an original image; performing WBCT decomposition on the detected ROI, transition zone and background respectively and performing multi-scale compressive sensing measurement, Then ROI-priority encoding is performed on each measured value obtained; if no ROI is detected, WBCT decomposition is performed on the original image and multi-scale compressed sensing measurement is performed, and then progressive encoding is performed. The present invention uses multi-scale compressed sensing technology for image compression, which facilitates the realization of image progressive encoding; the use of compressed sensing measurement also makes the method have excellent anti-interference characteristics; under the same compression ratio, multi-scale compressed sensing can achieve more Preserve image texture, edge and other information.

The invention provides a method for detecting underwater weak and small targets, which relates to the field of signal processing, uses the feature layer information fusion method to map the feature quantity into the same high-dimensional space, realizes classification, and detects through the classification results. The invention uses chaos theory Accurately describe and realize the feature extraction of the target signal and nonlinear components in the environmental noise, effectively avoid the interference of random components in the environmental noise, use the chaotic features in the signal for signal detection, which can significantly reduce the minimum detection signal-to-noise ratio and improve the detection probability. The random resonance method converts random noise energy into signal energy, improves the detection ability of weak targets, and can also highlight the nonlinear components contained in the signal. The classification method of the fusion center can eliminate false alarms and missed detections in a single node. etc. are separated from the correct detection results to further increase the detection probability and improve the effectiveness and reliability of weak and small target detection at sea.

The invention relates to a digital three-component wave speed probe which comprises a shell, a sensor core, an electromagnetic mechanism and an elastic arm, wherein the elastic arm is matched with the electromagnetic mechanism and is connected with the shell, and the sensor core and the electromagnetic mechanism are arranged in the shell. The invention is also characterized in that a circuit module is also arranged in the shell; the circuit module comprises a power supply circuit, a central processing controller, a signal acquisition circuit and a digital signal transmission circuit; the signal acquisition circuit and the digital signal transmission circuit are respectively connected with the central processing controller; the signal acquisition circuit comprises a signal acquisition interface; the digital signal transmission circuit is provided with a signal transmission interface and a communication port connected with the central processing controller; the signal acquisition circuit comprises an acquisition channel for acquiring vibration signals; and a signal modulating circuit transmits the vibration signals which are converted into digital signals to a signal receiving end of a ground instrument.

The invention provides a miniaturized multiservice wireless mobile ad hoc network system. A physical layer comprises a DSSS module and an OFDM module, wherein the OFDM module provides an OFDM protocol for transmitting service data information with a higher rate requirement, the DSSS module provides a DSSS protocol for transmitting network maintenance and control information of each node and service data information with a lower rate requirement. A link layer employs a TDMA mode to segment time into periodic frames and then segments the frames into DSSS fixation time slot portions, DSSS dynamic time slot portions and OFDM dynamic time slot portions. A network layer provides a multipath route protocol for transmitting all information, employs an active route mode to maintain one-hop neighbor nodes and employs an on-demand route mode to maintain neighbor nodes of more than one hop. The wireless mobile ad hoc network system can simultaneously satisfy a miniaturization transmission requirement and a multiservice transmission requirement.

The present invention relates to a tag antenna that solves the problem of densely placed interference, which includes: the antenna body is in a rectangular shape, and the first hollow part includes: a first sub-hollowout part, a second sub-hollowout part and a third sub-hollowout part, the first sub-hollowout part Both the first sub-hollowout and the third sub-hollowout are parallel to the wide side of the antenna body, the second sub-hollowout is parallel to the long side of the antenna body, and the tail end of the first sub-hollowout is connected to a tail end of the second sub-hollowout. connection, the tail end of the third sub-hollow part is connected to the other end of the second sub-hollow part; Both the hollowed-out part and the sixth sub-hollowed-out part are parallel to the wide side of the antenna body, the fifth sub-hollowed-out part is parallel to the long side of the antenna body, and the tail end of the fourth sub-hollowed-out part is connected to a tail end of the fifth sub-hollowed-out part, The tail end of the sixth sub-hollow part is connected with the other tail end of the fifth sub-hollow part.

The invention discloses a speed tracking control method for achieving a stable flight of an airship according to a given speed. The method comprises the steps of generating a forward flight velocity measurement and speed error signal; forming an error-based nonlinear gain entry; measuring a vertical velocity, a pitch angle and a pitch angle rate and building an adaptive term; designing an airship speed tracking control law; approximately simulating the characteristics of an airship pitching channel according to a mathematic model built by the differential equation of the airship pitching channel; and observing data of various states of the airship and drawing a picture by continuously adjusting control parameters, observing a data curve of a transverse flight speed of the airship and analyzing a response effect of constant-speed tracking control, thereby finally determining a group of airship control parameters, and enabling the speed tracking control of the airship to have satisfied dynamic response performance and steady-state response performance.