【摘要】：針對(duì)X射線脈沖星信號(hào)累積輪廓位相測(cè)量誤差大的問(wèn)題,提出了一種直接位相測(cè)量的頻域加權(quán)方法。首先,直接對(duì)X射線探測(cè)器捕獲和采樣形成的光子序列進(jìn)行頻域變換得到幅度譜,分別提取幅度譜各個(gè)成分的相位,再用幅度對(duì)相位變量加權(quán)平均,得到位相測(cè)量結(jié)果;進(jìn)一步采取分段加權(quán)的策略,解決序列過(guò)長(zhǎng)引起的內(nèi)存溢出問(wèn)題;最后對(duì)所提出方法的計(jì)算復(fù)雜度進(jìn)行了理論分析。仿真結(jié)果表明:在觀測(cè)時(shí)長(zhǎng)和采樣間隔相同的條件下,與平均法相比,加權(quán)法的測(cè)相精度提高了10%以上;與最大似然(ML)和非線性最小均方誤差(NLS)法相比,加權(quán)法的比相精度提升了1倍以上,計(jì)算速度處于ML法和NLS法之間;分段情況下性能會(huì)隨著分段數(shù)增加有所改善。
[Abstract]:Aiming at the problem of large error in the phase measurement of the cumulative profile of X-ray pulsars, a frequency domain weighting method for direct phase measurement is proposed. Firstly, the amplitude spectrum is obtained by the frequency domain transformation of the photon sequence captured and sampled by the X-ray detector, and the phase measurement results are obtained by weighted average of the phase variables by the amplitudes of each component of the spectrum. Furthermore, the strategy of piecewise weighting is adopted to solve the problem of memory overflow caused by long sequence. Finally, the computational complexity of the proposed method is analyzed theoretically. The simulation results show that under the condition of the same observation time and sampling interval, the phase measurement accuracy of the weighted method is improved by more than 10% compared with the average method, and compared with the maximum likelihood (ML) and the nonlinear minimum mean square error (NLS) method. The phase contrast accuracy of the weighted method is more than twice as high as that of the ML method and the NLS method, and the performance of the weighted method is improved with the increase of the number of segments.
【作者單位】： 西安電子科技大學(xué)空間科學(xué)與技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61172138,61401340)
【分類號(hào)】：P128.4
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本文編號(hào)：2218909