Clutter skeleton map-based moving target indicator (MTI) filter filtering method
A moving target display and filter technology, which is applied in the field of signal processing, can solve the problems that the clutter cannot be completely eliminated, the filter notch is not aligned with the clutter center frequency, etc., so as to avoid inaccurate frequency estimation and good clutter Suppression effect, effect with less computation
Active Publication Date: 2017-10-17
XIDIAN UNIV
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[0005] Whether it is the traditional MTI technology or the optimally designed MTI filter, it is necessary to perform frequency measurement processing on radar echo data in engineering implementation; in the engineering implementation of FPGA-based clutter suppression, frequency measurement will not only occupy a large amount of logic in FPGA Resources and storage resources, when the frequency estimation is inaccurate, it will also cause the designed filter notch to be misaligned with the center frequency of the clutter and cannot completely cancel the clutter
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[0038] refer to figure 1 , is a flow chart of a filtering method for displaying a moving target based on a clutter profile of the present invention; the filtering method for displaying a moving target based on a clutter profile includes the following steps:
[0039] Step 1, determine the radar, pulse Doppler radar is used in this embodiment; then the detection range of the radar is divided to obtain M"×N" target resolution units and M'×N' clutter units, each target The resolution unit is represented by the target distance size ΔR and the target azimuth size Δθ, ΔR=Cτ / 2, C represents the speed of light, τ represents the pulse width of the radar transmitted signal, and one pulse repetition period T rThe antenna rotation angle corresponding to the radar azimuth is the azimuth size Δθ; each clutter unit uses the clutter distance size ΔR c and clutter azimuth size Δa, ΔR c =M'·ΔR, Δa=N'Δθ; M">M', N">N', M", N", M', N' are respectively positive integers greater than 0.
[0040] I...
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The present invention discloses a clutter skeleton map-based MTI filter filtering method. The thinking of the clutter skeleton map-based MTI filter filtering method comprises determining a radar, dividing the detection range of the radar, obtaining M " * N " target resolution units and M' * N' clutter units, recording the M " * N " target resolution units as a target resolution unit matrix of M " * N " dimensions, and recording the M' * N' clutter units as a clutter unit matrix of M'* N' dimensions; representing na as the na-th antenna scanning period, defining that na belongs to a set {0,1, ...Y}, and orderly calculating a complete clutter map at the na-th antenna scanning period and a clutter skeleton map at the na-th antenna scanning period; and further obtaining a final clutter skeleton map; calculating the sea clutter maximum Doppler frequency shift, determining a Doppler interval, and obtaining D Doppler channels and the central frequency of each Doppler channel; and then calculating the weight coefficients of P K-order MTI filters, determining a radar input pulse, and further obtaining the final output results of the K-order MTI filters, wherein the final output results of the K-order MTI filters are the filtering results of the MTI filters based on the clutter skeleton map.
Description
technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a moving target display filter filtering method based on a clutter contour map, which is a sea clutter suppression technology, is suitable for target detection and tracking, and is convenient for engineering realization. Background technique [0002] Clutter suppression technology is an important means for radar to detect targets in the background of clutter. At present, there are many measures for clutter suppression. Among them, the frequency domain utilizes the difference of Doppler information between clutter and target echo. Suppressing clutter is the most commonly used method in radar signal processing, which is called moving target display MTI or moving target detection MTD technology. In order to solve the problem of blind speed, the common method is to use the staggered repetition frequency. At this time, MTI technology can only be selected; in engi...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 陈伯孝刘玉杨明磊
Owner XIDIAN UNIV