Doppler spectrum shaping method and system based on interpulse modulation
A technology of Doppler spectrum and Doppler spectrum, which is applied in the field of radar signal processing, can solve problems such as difficulty in practical application and lower image quality, and achieve the effect of improving anti-jamming performance
Inactive Publication Date: 2014-10-22
TSINGHUA UNIV
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Problems solved by technology
At present, most of the research focuses on frequency-division orthogonal waveforms, and the same-frequency code-division orthogonal waveforms are difficult to be practical because the cross-correlation is not zero in practice, and cross-correlation noise will be generated during long-term coherent accumulation, which will reduce image quality.
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[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0029] In the description of the present invention, it should be understood that the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated The number of technical characteristics. Thus, a feature defined as "first", "second" and "third" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise ...
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The invention provides a Doppler frequency spectrum shaping method and system based on interpulse modulation. The method comprises the following steps: generating a transmission pulse through a waveform generator and determining a Doppler frequency spectrum shaping function of the transmission pulse; performing interpulse modulation on the transmission pulse according to the Doppler frequency spectrum shaping function to generate a modulation pulse; receiving the modulation pulse (echo signals) and performing digital sampling; and performing interpulse fast Fourier transform on the modulation pulse obtained by sampling so as to obtain a shaping Doppler frequency spectrum. According to the method of an embodiment, the radar anti-jamming performance can be improved by shaping the transmission pulse Doppler frequency spectrum, and a novel technical approach is provided for orthogonal waveform separation of a multi-transmitting and multi-receiving radar system.
Description
technical field [0001] The invention relates to the field of radar signal processing, in particular to a Doppler spectrum shaping method and system based on pulse-to-pulse modulation. Background technique [0002] Radar has excellent characteristics such as all-day, all-weather, and penetrability, and has a wide range of applications in civil and military fields such as navigation, remote sensing, surveying and mapping, reconnaissance, warning, and fire control. But on the one hand, with the complexity of the electromagnetic environment, especially the application of spoofing jamming, higher requirements are put forward for the radar anti-jamming performance; Synthetic Aperture Radar (Multiple Input Multiple Output Synthetic Aperture Radar, referred to as MIMO-SAR) systems, etc., are facing new problems that put forward an urgent need for signal processing methods. [0003] For this reason, many effective methods have been proposed in the field of radar to mine and utilize ...
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IPC IPC(8): G01S7/36G01S7/28
Inventor 孟藏珍许稼彭应宁彭石宝郭锐王力宝
Owner TSINGHUA UNIV