Millimeter-grade micro-motion measuring method based on synthetic broadband pulse Doppler radar
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A technology of Doppler radar and measurement method, applied in the field of millimeter-level micro-motion measurement, can solve problems such as low accuracy
Active Publication Date: 2015-11-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0012] The existing micro-motion parameter estimation methods usually combine time-frequency analysis with Hough transform or inverse Radon transform to estimate the parameters of the micro-motion curve in the image domain, and its accuracy depends on the resolution of the time-frequency image. Therefore, its accuracy lower
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Embodiment 1
[0103] The system block diagram of this example is as follows figure 2 shown.
[0104] In this example, the parameters are set as follows:
[0105] Transmit signal sub-pulse duration T p =0.1μs, sub-pulse repetition period T r =1.6μs, synthetic bandwidth B=320MHz, number of frequency step steps N=64, frequency step interval Δf=5MHz.
[0106] The target is a hollow steel ball with a diameter of 5 cm and a small ball inside. Use the catapult to eject the steel ball into the space as a moving target, measure the motion of the steel ball and extract the micro-motion, the specific results are as follows.
[0107] As the steel ball moves away from the radar, the signal-to-noise ratio of the echo gradually decreases to 25dB. image 3 , Figure 4 The fitting results of envelope ranging and the fitting error of envelope ranging are given respectively. It can be seen that the ranging error increases with the decrease of signal-to-noise ratio.
[0108] Since the distance estimati...
Embodiment 2
[0113] In this example, the landing process of the aircraft is observed, and the parameters of the recorded signal are set as follows:
[0114] The transmitted signal is a 64-bit differential mapped m-code frequency step signal, with a chip width of 0.1us, a pulse width of 6.4μs, a pulse repetition period of 64μs, a single pulse bandwidth of 10MHz, a composite bandwidth of 320MHz, a number of pulses of 64, and a frequency step interval of 5MHz . One frame data time is 4096μs.
[0115] Since the aircraft is a complex target, its scattering points occupy multiple range units, and the range migration correction is performed on the echo. The corrected high-resolution one-dimensional range image sequence is as follows Figure 11 shown. From the ISAR imaging results of the aircraft, the distance unit where the nose is located is judged, and the phase of the distance unit where the nose is located is extracted. The time-varying curve is as follows: Figure 12 As shown by the middl...
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Abstract
The invention discloses a millimeter-grade micro-motion measuring method based on a synthetic broadband pulse Doppler radar. By employing the phase-deduction velocity and range measurement technology, the target movement is precisely measured, and an iteration motion parameter combined estimation method is employed to measure the target millimeter-grade micro-motion and extract target motion parameters precisely; compared with a conventional narrowband micro-motion measuring method, the millimeter-grade micro-motion measuring method is a phase-grade high-precision micro-motion measuring method, the range-measuring precision is the millimeter grade, the velocity-measuring precision is centimeter / second grade, and the requirement of high-precision range and velocity measurement of the radar for micro-motion extraction is satisfied; high resolution ability for the distance is provided, scattering points of a complex target can be separated, and distance and motion information of different scattering points of the target can be simultaneously obtained; the broadband PD processing method can realize echo coherent accumulation and effectively suppress static and low-speed clutters; and with the combination of track filtering information, the broadband enveloping range / velocity measurement precision can be improved, and the requirement of the signal to noise ratio by correct phase unwrapping is reduced.
Description
technical field [0001] The invention relates to the field of micro-motion measurement, in particular to a millimeter-level micro-motion measurement method based on synthetic broadband pulse Doppler radar. Background technique [0002] Micro-motion refers to the movement of the target or the components of the target other than the main body translation, such as the rotation of the helicopter rotor, the rotation of the jet engine blades, the heartbeat of the human body and the movement of the chest during breathing. The micro-motion state of the target can reflect the fine features of the target, which is an important basis for target recognition. [0003] Synthetic broadband pulse Doppler (PD) radar has the characteristics of instantaneous narrowband and synthetic broadband. Compared with broadband linear frequency modulation signals, it has the advantages of low AD sampling rate, long-term accumulation, amplitude-phase distortion compensation, and anti-interference. [000...
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