共查询到12条相似文献,搜索用时 93 毫秒
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研究了由具有不同角度量测精度的被动传感器组成的无源交叉定位系统中的最优交会角问题。在最小圆概率误差准则下得到了满足极值性条件的稳定点,讨论了最优交会角的充分条件。通过数学推导得出,在最小圆概率误差准则下最优交会角与传感器间的测角误差方差倍数k有关。当k≤0.5时不存在可行的最优交会角,且目标越接近误差较大的传感器时对应的圆概率误差越小;当k>0.5时,存在可行的最优交会角且其值随着k的增大而增大,当2部传感器的测角精度相等时达到最大值。 相似文献
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机载外辐射源雷达系统中,部署在飞机上的观测站传感器位置无法精确获知,观测站位置误差将严重影响目标定位精度。对此,该文提出一种观测站位置误差下多基外辐射源雷达3维定位代数解算法。该算法首先利用辅助变量将非线性双基距离和差(BRD)观测方程进行线性化,构造伪线性目标估计模型。然后将观测站位置量测噪声的统计特性融入定位算法,提出一种改进两步加权最小二乘(TS-WLS)算法实现观测站位置误差下外辐射源雷达目标定位。最后推导了克拉美罗下界(CRLB)和算法的理论误差。仿真结果显示,在适中的BRD量测误差和观测站位置误差下,所提算法的目标定位性能能够达到CRLB。
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Xueyuan Cao Juan Zhang Siwei Chen Russell John Varley Kai Pan 《Advanced functional materials》2020,30(35)
Graphene‐based aerogels have been widely studied for their high porosity, good compressibility, and electrical conductivity as piezoresistive sensors. However, the fabrication of graphene aerogel sensors with good mechanical properties and excellent sensing properties simultaneously remains a challenge. Therefore, in this study, a novel nanofiber reinforced graphene aerogel (aPANF/GA) which has a 3D interconnected hierarchical microstructure with surface‐treated PAN nanofiber as a support scaffold throughout the entire graphene network is designed. This 3D interconnected microporous aPANF/GA aerogel combines an excellent compressive stress of 43.50 kPa and a high piezoresistive sensitivity of 28.62 kPa?1 as well as a wide range (0–14 kPa) linear sensitivity. When aPANF/GA is used as a piezoresistive sensor, the compression resilience is excellent, the response time is fast at about 37 ms at 3 Pa, and the structural stability and sensing durability are good after 2600 cycles. Indeed, the current signal value is 91.57% of the initial signal value at 20% compressive strain. Furthermore, the assembled sensors can monitor the real time movement of throat, wrist pulse, fingers, wrist, and knee joints of the human body at good sensitivity. These excellent features enable potential applications in health detection. 相似文献