Abstract:Aiming at the problem of multi-variable comprehensive measurement, a multi-physical quantity group effect idea is proposed, which represents multi-variable measurement results in a multi-dimensional vector space with the samecommon time base, and shows the coupling, correlation, causality, and time sequence among them. It also explains tThe status, function and value of the delay time difference between channels in data acquisition system are explained., and introduces tThe method of using the delay time difference between channels to quantitatively evaluate the synchronization difference of different channels is introduced, and the time base compensation and correction of multi-channel synchronous acquisition is presented. Finally, the synchronization interface of data acquisition is extended to the measurement terminals of the sensor of in each channel.

Abstract:The chip scale atomic clock is a small, low-power, high-precision time and frequency device. Combining the chip scale atomic clock and the micro inertial measurement unit with the receiver of the global navigation satellite system, a micro positioning navigation and timing unit is formed, which can be widely used in the fields of national economy, military fields and national security. In this paper, the research progress of the chip scale atomic clock at home and aboard is introduced firstly. The difficulties and the key technologies in the preparationdevelopment of the chip scale atomic clock are also expatiated, including micro atomic vapor cell preparation technology, micro electro mechanical system integration technology and chip scale optical frequency comb technology. Finally, the development trend of the chip scale atomic clock is forecastedprospected.

Abstract:The quality of the flow field has an important effect on the performance test of the engine in the indoor test bed, and the high-quality flow field is the basis of accurate correction of the additional aerodynamic resistance in the indoor test bed. This paper compared and analyzed the difference of parameter requirements of aerodynamic flow field in the indoor test bed at home and abroad, analyzed the influence of inlet and exhaust structure of indoor test bed on flow field quality, and proposed the flow field quality evaluation parameter system with the uniformity of airflow velocity in test shop, injection ratio and total pressure distortion of inlet port as the key parameters. At the same time, some suggestions for improving the quality of flow field in domestic indoor test stand are put forward.

Abstract:Aiming at the quantitative judgment of synchronous sampling of sinusoidal signals and the quantitative evaluation of synchronization error in asynchronous sampling, an evaluation and judgment method based on four-parameter fitting is proposed, which can avoid the point counting error of 1 that affects the resolution during synchronization judgment. On this basis, the quantitative evaluation of synchronization error is defined and realized. In the actual sine wave, square wave, and triangular wave acquisition and measurement experiments, the correctness and feasibility of the method are verified. After using single-frequency digital filter processing, it can be extended and applied to the synchronous acquisition of non-sinusoidal periodic signals. The method described in this paper can be used in the quantitative evaluation of synchronization characteristics of acquisition and measurement systems with high synchronization requirements, and can also be used in quasi-synchronous sampling and measurement to quantitatively give synchronization deviations for compensation and correction of measurement errors.

Abstract:In order to eliminate the negative influence of positioning errors of industrial robots on measurement results in 3D robotic scanners, a multiocular vision measurement system is set up to locate the 3D scanning probe. In the multiocular vision measurement system, due to the large change in the distance between the camera and the marker, the reprojection error of the marker is difficult to evaluate the spatial positioning error. In addition, due to the influence of the camera calibration accuracy, the correction of the 3D coordinate by the bundle adjustment is not obvious. The bundle adjustment method is improved in this paper to improve the 3D reconstruction accuracy of the system. The image scale is introduced into the error equation of the traditional bundle adjustment method. The optimization of overall parameters is implemented in two steps based on the new error equation. Firstly, the intrinsic and extrinsic parameters of the camera are corrected, then the 3D coordinates of the measured point are corrected. The experimental results show that, in the measurement experiment of the length of the Creaform scale bar, the deviation between the measurement result and the reference value is less than 0.300 mm, and the standard deviation is not bigger than 0.110 mm, which fulfill the application requirements of the 3D robotic scanner.

Abstract:In this paper, the real-time acquisition of angle encoding signal based on RTX is studied with inertial testing equipment as the object of application. In the design of inertial testing equipment control system, the design of angle encoder signal real-time acquisition is the key to realize the high-precision control of angular position and angular rate of inertial test equipment. Different from the method of poor openness and complex circuit based on hardware real-time acquisition, this paper carries out real-time acquisition based on RTX+Windows system platform. The hardware scheme and interface driver of real-time acquisition of angle encoder signal based on RTX are designed to realize the real-time acquisition of angular position of inertial testing equipment. The method is successfully applied to the real-time acquisition of the angular position of the turntable, and meets the real-time control requirements of the turntable.

Abstract:Laser target simulator is widely used in the test of laser guidance system. The simulated orientation of laser signal source can be deviated from the design index greatly in the long-term use, and the laser guidance system should be calibrated and tested on site. Firstly, the principle of laser target simulator is analyzed in detail, and then the design scheme of laser target simulator calibration device is expounded respectively from the aspects of hardware and software design. The test results indicate that the parameters of laser signal simulation light source such as azimuth, emission angle and signal power can be accurately measured and verified by the device and the performance indexes meet the use requirements.

Abstract:The pressure generator is counted used as a measurement standard instrument by metrological verification departments for high accuracy level, easy operation and automatic verification. It has measurement and control functions, which is superior to digital pressure gauges. The measurement function is the function of digital pressure standard devices, while the control function is unique to pressure generators. A new method to improve the control function is proposed in this paper based on the research on principles of the control function, and the requirements of the verification regulations are further interpreted further combined with the verification software and data, which has certain reference value for better verification work.

Abstract:A kind of centroid measurement system based on mass reaction method is designed for the weapons systems in the developing, testing and manufacturing. This paper introduces the measurement principle, describes the structure composition and measurement method of the system, and analyzes the measurement data and its traceability. The results show that high accuracy of the center of gravity (CG) location can be delivered by using it.

Abstract:Composite calibration technology is the core technology of high-precision inertial device calibration used in weapon equipment type project, which can simulate the "real" use environment of inertial device in laboratory. In this paper, aiming at the problem of accelerometer compound calibration under the condition of centrifugal vibration, starting from the problem of dynamic imbalance existing in the system, athe centrifugal vibration compound model is established, and the acceleration under the arm mounting and vertical mounting is discussed, and the uncertainty analysis of the whole calibration system is given. Finally, the experimental verification based on the centrifugal vibration composite calibration device proves that the calibration device and calibration method can simulate the real calibration environment and improve the calibration accuracy.

Abstract:High-precision calibration ofCalibrating multi-parameter testing equipment plays an important role in improving the performance of inertial devices in practical conditions. By introducing latest developments of calibration standards for multi-parameter testing equipment, the shortcoming of isolated calibration thatwhich caused by the difference between the isolated calibration environment and the composite condition produced by the multi-parameter testing equipment is analyzed. To solve the problem and improve the capability of calibrating multi-parameter testing equipment, key points including smart transfer standard, synchronous measurement and dynamic calibration of multiple asynchronous variables, and designation of testing equipment are it is suggested to develop transmission standards suitable for multi-parameter composite environment, carry out research on synchronous acquisition and dynamic calibration technology of multi-channel asynchronous data, and carry out research on metrological design of multi-parameter test equipment to form a metrological technology system supporting multi-parameter test.