5.8 The First Space Flight Test and Its Results
387
Fig. 5.32 X-ray photon counts of Crab pulsar observed by XPNAV-1 on November 20, 2016
Fig. 5.33 Energy spectrum of Crab pulsar observed by XPNAV-1 on November 20, 2016
greater than 10 keV in the photon flux statistic. Therefore, in the data processing for
the TSXS, only the X-ray photons within the energy spectrum range of 0.5−9 keV
can be used usually.
Using the six arc-segments observation data of the Crab pulsar, the periodic feature
of the Crab is searched in the frequency domain based on the method of Fast Fourier
Transform (FFT), and thus it is found that there is a strong signal radiation of the Crab
at the frequency 29.650879 Hz as shown in Fig. 5.34, whose corresponding period
is 33.726 ms. At the corresponding observation epoch, the international reference
387
Fig. 5.32 X-ray photon counts of Crab pulsar observed by XPNAV-1 on November 20, 2016
Fig. 5.33 Energy spectrum of Crab pulsar observed by XPNAV-1 on November 20, 2016
greater than 10 keV in the photon flux statistic. Therefore, in the data processing for
the TSXS, only the X-ray photons within the energy spectrum range of 0.5−9 keV
can be used usually.
Using the six arc-segments observation data of the Crab pulsar, the periodic feature
of the Crab is searched in the frequency domain based on the method of Fast Fourier
Transform (FFT), and thus it is found that there is a strong signal radiation of the Crab
at the frequency 29.650879 Hz as shown in Fig. 5.34, whose corresponding period
is 33.726 ms. At the corresponding observation epoch, the international reference