8results about How to "Improve angle measurement accuracy" patented technology

The invention relates to radar angle measurement, in particular to an anti-multipath radar angle measurement system and method based on comprehensive angle measurement, and the method comprises the steps: an angle measurement fusion module generates multi-source pitch angle candidate data through sum-difference angle measurement and sum-sum angle measurement; the track batch optimization module is used for performing batch processing on the multi-source pitch angle candidate data of the multiple trace points in a track batch stage, selecting an optimal pitch angle and updating the three-dimensional coordinates of each trace point; the track association optimization module is used for calculating the Euclidean distance between the three-dimensional coordinate corresponding to the multi-source pitch angle candidate data of each trace point and the historical track in the track tracking stage, selecting the optimal pitch angle and updating the three-dimensional coordinate of each trace point; the flight path smoothing processing module is used for smoothing the flight path height sequence and outputting the smoothed flight path height sequence so as to reduce noise interference and improve height estimation stability; the technical scheme provided by the invention can effectively overcome the defects that multipath interference is difficult to suppress effectively, the angle measurement precision is low and the track starting stability is poor.

The invention discloses an ineffective potential suppression structure for a small inductosyn, and belongs to the technical field of inductosyn. The invention aims at the application requirements of high precision and small size of the inductosyn. A stator effective conductor of the inductosyn is arranged on the front surface of the stator substrate and is arranged along the whole circumference of the stator substrate; a stator substrate and a rotor substrate of the inductosyn are made of ferromagnetic materials. Stator ineffective conductors of the inductosyn are arranged on the back face of a stator substrate and are arranged along the whole circumference. The stator non-effective conductor and the stator effective conductor are connected through dense via holes; a stator effective conductor and a rotor conductor of the inductosyn are arranged in a radial alignment manner. According to the stator design scheme based on the double-layer metal-based MCPCB, the ferromagnetic material is used for improving the signal strength and shielding the ineffective potential, the precision and the signal-to-noise ratio are improved, meanwhile, the radial and axial space occupation is reduced, and the application requirement of the induction synchronizer in a small precise servo system is met.

This invention discloses a passive RFID tilt detection method based on a transceiver separation architecture, comprising the following steps: acquiring a continuous wave radio frequency signal from an RF exciter; collecting a mixed signal containing a passive tag reflected wave and an RF exciter leakage wave, and simultaneously acquiring a self-interference reference signal; performing self-interference cancellation processing on the mixed signal based on the self-interference reference signal, and extracting the tag backscattered signal; when a dual-tag array is used, measuring the phase of the passive tag array separately and calculating the phase difference, calculating the initial tilt angle of the target object, and obtaining the final tilt angle after correction; when a single passive tag is used, extracting the phase data of the single passive tag and performing linear interpolation, and substituting the interpolated real-time phase into a linear model to calculate the tilt angle. This invention can effectively eliminate transceiver self-interference and automatically offset the influence of distance changes on angle measurement accuracy, significantly improving the robustness and accuracy of object tilt detection.

The application particularly relates to a kind of distributed radiation source warning equipment angle measurement fusion processing methods, comprising: obtaining the interrupt number sent by each distributed warning equipment, alarm report;According to the time information, radiation source detection data are screened to alarm report, to obtain the multiple alarm reports belonging to the same radiation source, and for direction finding fusion processing;According to the signal amplitude parameter of radiation source in alarm report, the multiple alarm reports belonging to the same radiation source are screened, to obtain first alarm report, second alarm report;According to first alarm report, second alarm target report determines the position relationship of corresponding distributed warning equipment, and based on position relationship, the alarm direction of radiation source is direction finding fusion processing to determine the target direction information of radiation source.This method divides angle measurement algorithm into two steps, reduces the distributed warning pressure, also reduces fusion processing pressure.

The application provides a radar system, a self-calibration method and a vehicle, and relates to the technical field of radars.The radar system comprises: a plurality of radar chips connected in cascade, each radar chip comprising at least one receiving channel; a calibration transmitting module arranged in at least one of the plurality of radar chips, used for generating a calibration signal in a calibration mode of the radar system; a coupling network connected between the internal calibration transmitting module and each receiving channel of the plurality of radar chips, used for distributing the calibration signal to each receiving channel; and a signal processing module used for determining compensation data of each receiving channel according to amplitude differences and / or phase differences between received signals of the receiving channels in the calibration mode, the compensation data being used for compensating signals received by each receiving channel in a working mode of the radar system.Thus, the consistency of radio frequency amplitude and phase can be improved, and the detection performance and stability of the radar system can be improved.

The application discloses a millimeter wave radar-based super-resolution angle estimation method, which comprises the following steps: obtaining multi-element sampling data by receiving echo signals of a transmitting antenna by a receiving antenna; adding a Hanning window in a distance dimension and a speed dimension respectively; performing multi-channel non-coherent accumulation to improve signal-to-noise ratio; performing two-dimensional CFAR detection on the two-dimensional matrix data after non-coherent accumulation, performing CA-CFAR detection in the distance dimension and OS-CFAR detection in the speed dimension respectively, and obtaining matrix data containing a target; resolving and aggregating target points in a point trace condensation mode, so as to form a unique target point trace, and saving distance unit information and speed unit information of the target; and estimating a target azimuth by using an improved forward-backward Root-MUSIC algorithm on the multi-element data after compensation. The method considers that the forward-backward direction only uses the covariance matrix on the main diagonal line, and the application has a significant improvement in angle resolution and angle measurement accuracy.

The application discloses a virtual array-based antenna direction finding method, device and equipment. When performing a direction finding task of a target antenna for the first time, a moving track of the target antenna can be determined according to a direction finding requirement, and a plurality of physical sampling positions can be selected uniformly on the track M The three-dimensional coordinates of the physical sampling positions are recorded. Then the physical sampling positions are equivalent to virtual array antenna elements, and a virtual array antenna is formed according to the track arrangement. A narrowband signal source is received on the virtual array to convert into a complex signal matrix, and a DBF angle estimation is performed on the virtual array antenna based on the complex signal matrix to obtain a preliminary DOA estimation angle, so as to construct adjacent and difference beams based on the estimation angle. The estimation deviation is solved by using the adjacent beams, and the preliminary estimation angle is corrected to obtain a final accurate angle estimation result. The application can improve the DOA estimation precision without increasing the hardware cost and system complexity.

The application discloses a radar single-pulse angle discrimination curve fitting method based on cost sensitivity weighting, which comprises the following steps: 1, measuring sum-difference beam patterns of multiple wave positions in a microwave darkroom or an ideal field environment, and extracting original measurement values of angle discrimination curves in an angle range of interest; 2, constructing a measurement value combination for joint fitting of the angle discrimination function of multiple wave positions; 3, constructing a polynomial fitting optimization problem based on a least square criterion; 4, designing a cost sensitivity function and related parameters according to actual application requirements, and further correcting the cost function; 5, calculating intermediate variables and solving fitting coefficients; and 6, in a radar actual working project, on-line single-pulse angle measurement is completed based on the angle discrimination function obtained through fitting. Through simple parameter setting, the fitting accuracy of targets near the beam pointing direction and targets far away from the beam pointing direction can be flexibly adjusted according to actual application requirements.