scholarly journals Vibration compensation method based on instantaneous ranging model for triangular FMCW ladar signal

2021 ◽  
Author(s):  
Rongrong Wang ◽  
Bing Wang ◽  
maosheng xiang ◽  
Chuang Li ◽  
Shuai Wang
Keyword(s):  
Compensation Method ◽  
Vibration Compensation ◽  
Ranging Model

A Vibration Compensation Method for Absolute Gravimeters

2016 ◽  
Author(s):  
Guan Wang ◽  
Hua Hu ◽  
Kang Wu ◽  
Lijun Wang
Keyword(s):  
Transfer Function ◽  
Laser Interferometer ◽  
Compensation Method ◽  
Gravity Measurement ◽  
Absolute Gravity ◽  
Absolute Gravimeter ◽  
Broadband Seismometer ◽  
Vibration Isolators ◽  
Vibration Compensation ◽  
Absolute Gravity Measurement

The laser interferometer is used to track the falling object in a freefall absolute gravimeter, which could be disturbed by the vibration from the ground. Thus, the vibration compensation method is often used to reduce the influence of the vibration. Typically, a sensor (broadband seismometer) is used to record the vibration. But the measured ‘vibration’ Nm(t) does not equal the motion of the reference corner cube N(t). Because there exists a transfer function G(s) making Nm(s) = G(s)N(s). Traditionally, G(s) is assumed to be equal to the transfer function of the sensor, which can be achieved with the help of other equipment. But the assumption is not reasonable and the process of calculating the transfer function is complicated. A novel vibration compensation method without any other equipment is proposed in this paper. In this method, G(s) is simplified to estimate N(t) using N′(t) = ANm(t − τ), which is used for compensation. The gain A and delay τ can be obtained by analysis of the data acquired by the absolute gravimeter. The experiments are conducted with the homemade absolute gravimeter T-1 and repeated for 75 times. The standard deviation of the uncompensated results is 3276 μGal (1 μGal = 1 × 10−8 m/s2), while that of the compensated results is 167 μGal. The compensation method not only achieves a reduction by nearly a factor of 20, but also can be simply used without any other equipment. The results indicate that the method basically meets the demands of absolute gravimeters. In the future, it may be applied to dynamic absolute gravity measurement and take the place of vibration isolators.

Research on Satellite Platform Vibration Compensation Method Based on Liquid Crystal Steering System

2012 ◽  
Vol 455-456 ◽  
pp. 1627-1632
Author(s):  
Xiang Zhi Li ◽  
Cheng Shan Han ◽  
Ming Wen ◽  
Qing Lei Zhao ◽  
Xiao Nan Jiang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Steering System ◽  
Compensation Method ◽  
Satellite Platform ◽  
Vibration Compensation

scholarly journals Vibration Compensation for a Vehicle-mounted Atom Gravimeter

2021 ◽  
Author(s):  
Jie Guo ◽  
Siqian Ma ◽  
Chao Zhou ◽  
Jixun Liu ◽  
Bin Wang ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Phase Fluctuation ◽  
Static Condition ◽  
Compensation Method ◽  
Suppression Factor ◽  
Moving Vehicle ◽  
Before And After ◽  
Order Of Magnitude ◽  
Vibration Compensation ◽  
Vibration Noise

The performance of the absolute atom gravimeters used on moving platforms, such as vehicles, ships and aircrafts, is strongly affected by the vibration noise. To suppress its influence, we summarize a vibration compensation method utilizing data measured by a classical accelerometer. The measurements with the accelerometer show that the vibration noise in the vehicle can be 2 order of magnitude greater than that in the lab during daytime, and can induce an interferometric phase fluctuation with a standard deviation of 16.70π. With the compensation method, our vehicle-mounted atom gravimeter can work normally in these harsh conditions. Comparing the Allan standard deviations before and after the vibration noise correction, we find a suppression factor of 22.74 can be achieved in static condition with an interrogation time of T = 20 ms, resulting a sensitivity of 1.35 mGal/Hz1/2, and a standard deviation of 0.5 mGal with an average time of 10 s. We also demonstrate the first test of an atom gravimeter in a moving vehicle, in which a suppression factor of 50.85 and a sensitivity of 60.88 mGal/Hz1/2 were realized with T = 5 ms.

Current Reduction Method for Dual Active Bridge Converter in Non-linear Dead-time Compensation Method

2020 ◽  
Vol 140 (3) ◽  
pp. 175-183
Author(s):  
Kengo Kawauchi ◽  
Hayato Higa ◽  
Hiroki Watanabe ◽  
Keisuke Kusaka ◽  
Jun-ichi Itoh
Keyword(s):  
Reduction Method ◽  
Dead Time ◽  
Compensation Method ◽  
Dual Active Bridge ◽  
Non Linear ◽  
Dead Time Compensation ◽  
Current Reduction
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