Moving target Doppler frequency shift obtaining method and device based on periodic continuation
A technology of Doppler frequency shift and moving target, which is applied in the field of electromagnetic scattering characteristic calculation, can solve the problems of difficult time-domain echo duration and difficult resolution of Doppler frequency shift, shorten the main lobe width and improve the Doppler frequency. The effect of resolution
Active Publication Date: 2021-06-29
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology
However, limited by computing resources, the time-domain echo duration calculated by the time-domain method is difficult to exceed 10 -9 s magnitude, the corresponding spectrum main lobe width is difficult to be lower than the GHz magnitude, and it is difficult to distinguish the Doppler frequency shift of the KHz magnitude
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Embodiment 1
[0037] Such as figure 1 As shown, a method for obtaining the Doppler frequency shift of a moving target based on cycle extension provided by an embodiment of the present invention may generally include:
[0038] Step S1, determining the segment to be extended of the time domain echo signal, and intercepting the segment to be extended from the time domain echo signal, specifically: according to the size of the simulation target and the distance between the incident wave source and the simulation target, Calculate the time t when the wave front of the echo signal at the far end of the target reaches the echo signal receiving surface 0 and the time t when the end edge of the echo signal at the near end of the target reaches the receiving surface of the echo signal 1 , and then intercept t in the target simulated time-domain echo signal 0 time to t 1 The echo signal at time is used as the segment to be extended;
[0039] Step S2, the cut-off time t of the segment to be extende...
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The invention relates to the field of electromagnetic scattering characteristic calculation of a moving target and particularly relates to a Doppler information acquisition technology of the moving target. The moving target Doppler frequency shift obtaining method based on periodic continuation comprises the following steps of intercepting an echo signal from a moment t0 when a wave front of a target far-end echo signal reaches a receiving surface to a moment t1 when a termination edge of a target near-end echo signal reaches a receiving surface in a target simulation time domain echo signal; moving forwards from t1 until the phase is consistent with the t0 moment, recording the current moment as t2, and deleting the part from t1 to t2 from the intercepted signal; calculating the number N of continuation cycles; sequentially connecting the N periods of time domain echo signals end to end to form a time domain continuation echo signal; and obtaining Doppler frequency shift of the moving target according to the time domain continuation echo signal. The moving target Doppler frequency shift obtaining device based on periodic continuation comprises an interception module, a deletion module, a periodic number calculation module, a splicing module and a Doppler frequency shift obtaining module.
Description
technical field [0001] The invention relates to the field of calculation of electromagnetic scattering characteristics of a moving target, in particular to the Doppler information acquisition technology of a moving target. Background technique [0002] When using the time-domain method to calculate the electromagnetic scattering characteristics of a moving target, it is necessary to calculate the time-domain echo of the target to obtain the Doppler information of the target. At present, the commonly used method is to use the truncated point frequency signal as the incident signal, and analyze the spectrum of the scattered signal to obtain the Doppler characteristics of the target. However, limited by computing resources, the time-domain echo duration calculated by the time-domain method is difficult to exceed 10 -9 s magnitude, the corresponding spectrum main lobe width is difficult to be lower than the GHz magnitude, and it is difficult to distinguish the Doppler frequency...
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Login to View More IPC IPC(8): G01S7/41
CPCG01S7/41Y02A90/10
Inventor邓浩川满良冯雪健
OwnerBEIJING INST OF ENVIRONMENTAL FEATURES