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Rapid ultra-resolution radar imaging method based on post random modulation

A random modulation, super-resolution technology, applied in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc., can solve the problem of inability to effectively improve the quality of detection data, inability to achieve long distances, and inability to break through the resolution of radar imaging To achieve the effect of guaranteeing the improvement, ensuring the quality of the received signal, and enhancing the characteristics of the signal

Active Publication Date: 2017-05-17
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] Of the above two imaging methods, the coherent radar imaging method cannot break through the limitation of the radar aperture on the radar imaging resolution. In the process of using the relative motion between the radar and the target, the relative motion needs to be accurately controlled
The non-coherent radar imaging method cannot effectively improve the quality of detection data, so that it is impossible to realize super-resolution radar imaging under long-distance and low signal-to-noise ratio conditions

Method used

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  • Rapid ultra-resolution radar imaging method based on post random modulation
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  • Rapid ultra-resolution radar imaging method based on post random modulation

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Embodiment

[0062] The application scenarios of fast super-resolution radar imaging method based on post-random modulation are as follows: figure 2 As shown, the transmitter used is a single-base radar, and the number of elements of the receiving radar array is 11, arranged linearly, the target distance is about 1000 meters, the center frequency of the transmitted signal is 10GHz, the bandwidth of the signal configuration is fixed at 1GHz, and the detection target is Small UAV (with corner reflector); target speed 100 m / s; detection data signal-to-noise ratio 0dB.

[0063] The correlation optimization results of the receiving array pattern after post-modulation are as follows: image 3 As shown, as the number of optimizations increases, its correlation will increase slightly; under the target characteristics verified by the listed embodiments, the radar imaging results of over ten times are realized, such as Figure 4 As shown, its imaging effect is close to the ideal state.

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Abstract

The invention discloses a rapid ultra-resolution radar imaging method based on post random modulation. The method includes the following steps: step 11, conducting coherent detection on an object by using a broadband signal, using a radar array to receive data, increasing the signal-to-noise ratio of the received data by using the method matching a transmitted signal; Step 12, determining the substantial size and position of the object, based on the size and position of the object, conducting post random modulation on the deployment of a receiving gain space which receives the radar array, and using the optimization method to optimize the effects of post random modulation; and step 13, constituting the detection data after the post random modulation to a linear equation group, using the optimization method to resolve the linear equation group and obtaining the result of the ultra-resolution imaging of the object. According to the invention, the method can conduct rapid ultra-resolution radar imaging on the object under low signal-to-noise ratio condition, and obtains an imaging resolution to be beyond the limit of diffraction.

Description

【Technical field】 [0001] The invention relates to the field of radar imaging, in particular to a fast super-resolution radar imaging method based on post-random modulation. 【Background technique】 [0002] The existing radar imaging methods are to transmit the detection signal first, and then receive the scattered echo of the target, through the radiation characteristics of the radar transmitting array or receiving array, or based on the frequency change of the target echo, or by using the space-time two-dimensional random radiation signal to interact with the target echo. The coherence between the wave signals reconstructs the distribution of the scattering coefficient of the target. In radar imaging systems, the transmitted signals are known as prior knowledge. [0003] The existing radar imaging methods are mainly divided into two categories. One is the coherent radar imaging method. The transmission and reception of this method are coherent. By comprehensively using the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89G01S7/41
CPCG01S7/415G01S7/418G01S13/89
Inventor 朱士涛董晓丽贺雨晨张明施宏宇张安学徐卓
Owner XI AN JIAOTONG UNIV
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