70results about How to "Improve characterization accuracy" patented technology

The invention discloses an obstacle trajectory prediction method and device, and the method comprises the steps: outputting a prediction trajectory of a target obstacle under each intention type through a trajectory prediction model according to the collected environment information, the historical trajectory of the target obstacle and all predetermined reference trajectories; the method can improve the depicting precision of the movement tendency of the obstacle under complex conditions, and guides the unmanned vehicle to better avoid the obstacle.

A digital circuit operating frequency characterizer provides a combination of frequency and duty cycle characterization. The digital circuit operating frequency characterizer includes a programmable frequency generator, a programmable edge variator, a test engine, and a control circuit. The programmable frequency generator provides one or more output signals, and the programmable edge variator is coupled to one or more outputs of the programmable frequency generator for adjusting duty cycle. The test engine uses the outputs from the programmable edge variator and / or programmable frequency generator to apply a defined test signal sequence to a circuit under test and produce a status output after evaluating the outputs received from the circuit under test. The control circuit is connected to the control inputs of the programmable frequency generator, programmable edge variator, and the status output of the test engine. The control circuit synchronizes their operations and performs the combination of frequency and duty cycle characterization.

This specification discloses a trajectory prediction method and device for an obstacle. According to the collected environmental information, the historical trajectory of the target obstacle, and each predetermined reference trajectory, through the trajectory prediction model, the target obstacle can be output The predicted trajectory under each intention type and the predicted probability of the target obstacle moving on each predicted trajectory can improve the accuracy of describing the movement tendency of obstacles in complex situations, thereby guiding the unmanned vehicle to better avoid obstacles.

The invention relates to a testing system and method for the mechanical efficiency of a gearbox on a vehicle. Four wheels of a testing vehicle are each connected with a TPMS, and each TPMS is connected with a TPMS receiver; a first K-type thermocouple is connected with a hub data acquisition instrument; a second K-type thermocouple is connected with a transmission interface of the testing vehicle,and a signal is transmitted to the hub data acquisition instrument. A current sensor and a voltage sensor are connected with a power generator; the TPMS receivers, the hub data acquisition instrument, the current sensor and the voltage sensor are all in signal connection with a controller. The whole-vehicle gearbox mechanical-efficiency testing on a hub test bed has the advantages of convenient operation, controllable loading, reliable testing results and provision of the third party data collection. The mechanical efficiency study uses the whole gearbox as an object, the characterization accuracy is high, the test reliability is improved, and the system and method has important guiding significance for the development of gearboxes.

The invention discloses an ultrasonic RF (radio frequency) time sequence-based tissue characterization method, which comprises the following steps of 1, feature extraction: performing operations as shown as follows on each tissue sample to obtain corresponding feature vectors; 2, tissue recognition, wherein the step1 comprises the following steps: 1-1, scanning tissues to acquire multiple frames of ultrasonic echo RF signals of the tissues; 1-2, demodulating a certain ultrasonic echo RF signal and displaying a B-mode graph; 1-3, selecting an ROI (region of interest) of which the size is M*N from the B-mode graph; 1-4, taking previous L RF signals from each point in the ROI to construct M*N ultrasonic RF time sequences of which the length is L; 1-5, extracting fractal features, frequency domain features and time domain features of the ultrasonic RF time sequences to obtain the feature vectors of each tissue samples. According to the ultrasonic RF time sequence-based tissue characterization method disclosed by the invention, the features from three angles: fractal, frequency domain and time domain, are extracted based on the ultrasonic RF time sequences, and the tissues are recognized by using a classifier; the ultrasonic RF time sequence-based tissue characterization method can be widely applied to the field of ultrasonic medical detection and ultrasonic tissue characterization, and the like.

The invention discloses a portable grating ruler main ruler engraving device and an engraving method thereof. The portable grating ruler main ruler engraving device comprises a first electromagnet, a supporting rod, a precise injection pump, an X-axis linear guide rail, a Y-axis linear guide rail, a control system, a high-voltage direct current power source, a rotary disc, an extensible system and a second electromagnet; the X-axis linear guide rail is installed right above the first electromagnet; the rotary disc is fixed under the X-axis linear guide rail; the Y-axis linear guide rail, the extensible system and the second electromagnet are sequentially arranged below the rotary disc from top to bottom; the first electromagnet is provided with a straight groove; the precise injection pump is installed on the Y-axis linear guide rail; an injection needle is arranged below the precise injection pump; polymer solution is installed inside the precise injection pump; a positive electrode of the high-voltage direct current power source is connected with the injection needle; a negative electrode is connected with the ground. The portable grating ruler main ruler engraving device is large in engraving area, high in engraving accuracy, skillful in design, simple in structure, small in size, capable of being detached and assembled, convenient to carry and move and widely applied to the field of engraving of a grating ruler.