Design of Digital Balance Loop in Gravity Gradiometer based on AD5791
The scale factor balance loop is the key part in the rotating accelerometer gra,ity gradiometer.The digitization of the balance loop can provide lower noise and higher reliability, and also reduce the size and the weight.The design with the high performance 20-bit digital-to-analog converter AD5791 is introduced in this paper.A floating-point 32-bit digital signal controller TMS320F28335 is used as the controller of a daisy-chain with four AD5791 converters.The hardware module diagram and the operation sequence of the digital balance loop are also provided.Their key parameters of AD5791, integral nonlinearity error, differential nonlinearity error, and low frequency noise, are measured and evaluated particularly.According to the results of testing, this device has the ability of 20-bit resolution and lppm accurate.By this design of digital balance loop based on AD5791, the consistency of the scale factors of accelerometer pairs can be tuned for six magnitudes theoretically, that is, from the initial order of 10-5 to the targeted order of 10-1 1.
AD5791 digital balance loop gravity gradiometer
Ding Hao Cai Tijing Su Tao
Department of Instrument Science and Engineering,Southeast University,Nanjing 210096,China
国际会议
哈尔滨
英文
414-416
2013-08-16（万方平台首次上网日期，不代表论文的发表时间）