共查询到16条相似文献,搜索用时 109 毫秒
1.
二频机抖激光陀螺小范围温度漂移补偿模型的研究 总被引:2,自引:0,他引:2
从实验上研究了环境温度变化在10℃范围内二频机抖陀螺的零偏和温度的关系。通过大量高低温环境的重复性温度实验,利用逐步回归法建立了一种零偏温度补偿模型,并对该模型的补偿效果进行了实验测试。结果表明,在小范围内二频机抖陀螺的零偏和温度、温度梯度及温度速率有较好的线性关系和重复性,可以通过建立温度补偿模型来提高陀螺的精度,而且该模型完全满足工程上的实时补偿要求。 相似文献
2.
3.
4.
5.
机抖激光陀螺捷联惯导系统的温度补偿方法 总被引:1,自引:0,他引:1
分析了系统温度对机抖激光陀螺捷联惯性导航系统的影响因素,介绍了降低和补偿捷联系统温度误差的4种方法.通过重复性温度实验,利用逐步回归法分析了激光陀螺零偏与温度的关系:通过多项式拟合,分别得到了加速度计的零偏、标度因子和IF转换电路的温度补偿模型,并在捷联系统中得到应用.对其中的两种方法进行了实验研究和导航测试,并对两种方法的补偿效果进行了对比.结果表明:通过温度实验得到惯性器件的温度补偿模型对其温度误差进行实时补偿是捷联系统最理想的补偿方法.补偿后系统定位测试1 h的圆概率误差(CEP)优于0.3 n mile/h.达到国内先进水平. 相似文献
6.
7.
8.
消除抖动偏频激光陀螺动态闭锁误差的实验研究 总被引:11,自引:3,他引:8
向抖动中注入高斯概率密度的随机噪声 ,以消除抖动偏频激光陀螺的动态闭锁误差。设计了随机噪声发生器及注入方案 ,并在自行研制的机抖陀螺上进行实验。结果表明 :动态闭锁误差因该随机噪声的注入而消除。 相似文献
9.
《中国激光》2016,(10)
在机抖激光陀螺(DRLG)捷联惯导系统(SINS)中,陀螺的抖动偏频会引起伪圆锥运动。分析了伪圆锥运动对捷联惯导系统旋转矢量计算的影响,并推导了其表达式。通过数值计算,分析了影响伪圆锥误差的因素,提出了机抖激光陀螺抖动频差的匹配原则,以实现伪圆锥误差最小化。基于该匹配原则,面向工程实际问题提出了一种机抖激光陀螺抖频调谐技术。仿真分析和实验结果表明,选用一种主体抖动轮并按需选配调节构件,该技术可满足系统对陀螺抖动频差的匹配要求,同时不会对陀螺整体外形尺寸和抗振性能造成任何影响。与传统方案相比,进一步提升了机抖激光陀螺,尤其是小型化机抖激光陀螺的工程化水平,降低了生产成本。 相似文献
10.
温度是影响激光陀螺精度的主要因素之一,对温度引起的机抖激光陀螺漂移进行精确建模,对提高激光陀螺捷联惯导系统的精度具有十分重要的意义。介绍了机抖激光陀螺的温度特性,建立了基于改进人工鱼群算法(Improved Artificial Fish Swarm Algorithm,IAFSA)的机抖激光陀螺温度补偿模型,给出了IAFSA 建模的详细步骤和方法, 对传统的逐步回归方法和IAFSA 进行了比较。结果表明:IAFSA可以对温度引起的激光陀螺漂移进行精确建模,补偿后的激光陀螺零偏不稳定性达到0.001 85()/h,比传统的逐步回归方法建模精度提高了15.5%,得到的温度补偿模型可以对陀螺的零偏进行实时补偿,设计了两种典型的温度试验,获得了满意的补偿效果。 相似文献
11.
《Electron Devices, IEEE Transactions on》1971,18(8):557-562
Observations have been made of the relation between temperature and bias-induced frequency variations of CW X-band Gunn oscillators. The results indicate that a large part of the frequency modulation through the bias circuit at modulation frequencies below approximately 1 MHz can be caused by modulation of the device temperature. Other modulation processes also occur. 相似文献
12.
13.
探测器暗电流及其测量不确定度是影响短波红外偏振测量仪器测量精度的最重要因素。首先,结合红外探测器的工作原理,分析并建立了暗电流影响下的红外探测系统噪声模型。根据分析结果设计实验获得短波红外探测器G5853-21暗电流与温度和反向偏压关系。然后,以分孔径偏振探测系统为例,推导了斯托克斯参数误差模型和偏振度误差模型。最后,重点分析空间环境应用背景下,针对暗电流影响的改进措施,提出了探测器精确温控的暗电流影响改进方案,并给出了短波红外探测器工作温度指标要求。结果表明:通过对探测器进行精确的温度控制以降低暗电流数值,可以将包含暗电流测量不确定度和其他噪声引起的偏振度测量误差控制在0.42%(=0.3时)以内。 相似文献
14.
Lech Dobrzanski Wlodek Strupinski 《Quantum Electronics, IEEE Journal of》2007,43(2):188-195
The current-voltage (I-V) characteristics and low-frequency noise of the GaN p-i-n diodes were investigated in temperature range from 10 K to 300 K. We found that the reverse biased p-i-n diode made of GaN/AlGaN exhibits features of the space charge limited (SCL) current flow and its I-V characteristics can be approximated by the power law I~Vn relation. This phenomenon can be attributed to the presence of the multiple charge traps in the intrinsic region of device. It has been demonstrated that the direct tunneling from traps to bands may occur in diodes at forward and reverse bias with strong support of the Frenkel effect. The low frequency noise in our devices does not depend on temperature in both bias directions under cryogenic conditions. The observed low-frequency noise features support the hypothesis that excess tunneling current and recombination at grain boundaries are origins of the 1/f low-frequency noise in the diode at forward bias. The 1/f noise in the reverse bias regime can be described as a composition of many Lorentzian noise components that originate from traps, which have specific depth distribution 相似文献
15.
《Electron Devices, IEEE Transactions on》1967,14(9):522-525
The output power of a cavity-controlled Gunn oscillator has been measured at a frequency of 10 GHz, as a function of bias voltage over the temperature range 30°C to 120°C. The measurements were made using 500-ns pulses to avoid significant changes in-device temperature during a pulse, and at a duty cycle of 20:1 to maintain a low mean input power. The device was operated in a coaxial cavity made of invar, and temperature control effected by operating the cavity in an oven. It has been found that ranges of bias voltages exist over which power output and efficiency is extremely sensitive to temperature changes, and that, depending on the particular conditions, power output can either increase or decrease. The effect of increasing temperature has also been found to reduce the bias voltage required to obtain maximum power output and efficiency. 相似文献
16.
通过对光纤环进行应力分布测试和筛选,实现了改善光纤陀螺性能的目的。分析研究了由应力作用产生的光纤环非互易性对陀螺输出特性的影响,采用光纤应力分析仪对光纤环进行应力测试和筛选。并将经过光纤环在线测试和热应力测试筛选后的光纤环组装成陀螺进行零偏实验。实验结果表明:采用应力分析仪能够有效对光纤环进行应力测试和筛选,经过筛选后组装的光纤陀螺精度有了明显改善,全温范围内零偏稳定性可达0.08 ()/h。对后续高精度光纤陀螺研制有一定的借鉴意义。 相似文献