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武达亮, 吴谨, 刘劲, 宁晓琳, 康志伟. 复合测速X射线脉冲星导航方法[J]. 深空探测学报(中英文), 2021, 8(6): 632-640. DOI: 10.15982/j.issn.2096-9287.2021.20210114
引用本文: 武达亮, 吴谨, 刘劲, 宁晓琳, 康志伟. 复合测速X射线脉冲星导航方法[J]. 深空探测学报(中英文), 2021, 8(6): 632-640. DOI: 10.15982/j.issn.2096-9287.2021.20210114
WU Daliang, WU Jin, LIU Jin, NING Xiaolin, KANG Zhiwei. X-Ray Pulsar Navigation Based on Hybrid Velocimetry Method[J]. Journal of Deep Space Exploration, 2021, 8(6): 632-640. DOI: 10.15982/j.issn.2096-9287.2021.20210114
Citation: WU Daliang, WU Jin, LIU Jin, NING Xiaolin, KANG Zhiwei. X-Ray Pulsar Navigation Based on Hybrid Velocimetry Method[J]. Journal of Deep Space Exploration, 2021, 8(6): 632-640. DOI: 10.15982/j.issn.2096-9287.2021.20210114

复合测速X射线脉冲星导航方法

X-Ray Pulsar Navigation Based on Hybrid Velocimetry Method

  • 摘要: 为抑制由航天器速度引起的脉冲星信号多普勒效应,提出了基于直接/间接混合测速的X射线复合脉冲星导航方法。直接测速方法根据脉冲星畸变轮廓直接提供速度信息,提出了一种面向直接测速测距的畸变轮廓匹配估计方法。直接测速精度高,但仅适用于高流量脉冲星,即Crab脉冲星。间接测速方法通过建立速度与脉冲星到达时间之间的关系模型,由卡尔曼滤波器间接提供速度信息。低流量脉冲星畸变轮廓信噪比低,无法体现脉冲星畸变这一微弱特征。因此,间接测速方法适用于低流量脉冲星。在此基础上,利用直接测速与间接测速方法轮流对滤波器更新,卡尔曼滤波器提供高精度导航信息。仿真结果表明,与间接测速脉冲星导航相比,基于直接/间接混合测速的X射线脉冲星导航方法的精度提高了15%。

     

    Abstract: In order to suppress the Doppler effects in pulsar signals caused by spacecraft velocity, a novel method of X-ray pulsar navigation based on direct/indirect hybrid velocimetry was proposed. The direct velocimetry method provided velocity information directly according to the distorted pulsar profile. It had high accuracy, but was only suitable for high flux pulsar, namely Crab pulsar. A distorted profile matching estimation method for direct velocity and distance measurement was proposed. The indirect velocimetry method was to establish the relationship model between velocity and pulsar time-of-arrival, and provide velocity information by Kalman filter indirectly. The signal-to-noise ratio of low flux pulsar distortion profile was very low, which could not reflect the weak pulsar distortion. Therefore, the indirect velocimetry method was suitable for low flux pulsars. Based on this, the direct velocimetry method and the indirect one were used to update the Kalman filter in turn. And the Kalman filter was used to provide high-accuracy navigation information. Simulation results show that the accuracy of X-ray pulsar navigation method based on direct/indirect hybrid velocimetry is 15% higher than that of the indirect pulsar navigation.

     

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