A Method of Frequency Modulation Stepping Inverse Synthetic Aperture Imaging for Maneuvering Targets
A technology of inverse synthetic aperture and frequency modulation stepping, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve problems such as inability to image, distortion, and affect the accumulation of target energy, so as to improve imaging capabilities, The effect of eliminating errors
Active Publication Date: 2017-08-29
中机众联(北京)能源科技有限公司
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Problems solved by technology
The technical problems to be solved in the present invention include: 1) under the FM stepping radar system, range migration effect and Doppler migration effect will occur in the echo signal of the maneuvering target, causing the target energy to cross multiple range units and Doppler migration effects. Le unit, the range-Doppler imaging will be distorted, and it will also affect the energy accumulation of the target. In the case of low signal-to-noise ratio, there will be insufficient signal energy to make imaging impossible; 2) The traditional coherent accumulation technology scheme cannot It is a good balance between low signal-to-noise ratio and energy coherent accumulation in the case of target maneuvering movement
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The invention discloses a maneuvering object frequency modulation stepping retrosynthesis aperture imaging method, belonging to the radar signal processing and imaging technology field. The Maneuvering object frequency modulation stepping retrosynthesis aperture imaging method comprises steps of (1) obtaining a rough distance image after a radar echo is processed by de-slopping, (2) estimating a target movement parameter from a rough distance image signal FRAF transformation spectrogram, (3) utilizing parameter estimate values of various pulse trains to fit an accuracy value, (4) constructing a phase compensation function and compensating a rough distance image signal, (5) obtaining an object fine distance image in a slow time dimension FFT by the compensated rough distance image signal, (6) performing phase focusing on an object fine distance image signal, (7) performing turntable imaging to obtain an ISAR image. The maneuvering object frequency modulation stepping retrosynthesis aperture imaging method can stably estimate the target movement parameter under the low signal to noise ratio, can compensate the distance generated by the object motion and the doppler migration, realizes the accumulation of the phase and parameters, improves the imaging capability of the frequency modulation stepping radar on the maneuvering object under the low signal to noise ratio and has a popularization value.
Description
A Method of Frequency Modulation Stepping Inverse Synthetic Aperture Imaging for Maneuvering Targets technical field The invention relates to a frequency modulation stepping radar imaging method of a maneuvering target under low signal-to-noise ratio, and the method can be applied to the frequency modulation stepping radar to image the maneuvering target under low signal-to-noise ratio. Background technique The FM step signal is an easy-to-implement high-distance resolution signal. It transmits a series of narrow-band FM pulse signals with carrier frequency linear jumps. After performing two FFT operations on the echo pulses, the composite distance high-resolution signal can be obtained. Rate. This kind of signal combines the advantages of step frequency and linear frequency modulation pulse signal, and has been widely used, but there are not many analyzes of frequency modulation step radar in the existing literature. Pulse accumulation imaging is a common method for inv...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/90G01S13/9064
Inventor 罗文茂姜敏敏闫之烨
Owner 中机众联(北京)能源科技有限公司