Microwave stare correlated imaging device capable of performing random frequency hopping based on different code speeds

A technology of correlative imaging and microwave staring, which is applied in the directions of measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve the problems of angular resolution limitation, limited application, long revisit period, etc., and achieve high resolution , the effect of reducing redundancy

Active Publication Date: 2014-04-23
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Although synthetic aperture radar (SAR) has high azimuth resolution, its revisit period is long, and it has inevitable inherent disadvantages in scenarios that require long-term (quasi) continu

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  • Microwave stare correlated imaging device capable of performing random frequency hopping based on different code speeds
  • Microwave stare correlated imaging device capable of performing random frequency hopping based on different code speeds
  • Microwave stare correlated imaging device capable of performing random frequency hopping based on different code speeds

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Embodiment Construction

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] The first prerequisite for realizing high-resolution microwave staring correlative imaging is to form an ideal space-time two-dimensional random microwave radiation field in the target area. There are non-correlation features between the radiation fields at the position, and non-correlation features between the radiation fields in the target area at different times. In engineering, under the conditions of limited array size, limited bandwidt...

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Abstract

The invention discloses a microwave stare correlated imaging device capable of performing random frequency hopping based on different code speeds. A random radiation unit is used for generating and transmitting a microwave pulse signal according to control information transmitted by a main control unit, the microwave pulse signal forms a microwave radiation field having time-space two-dimensional random features in a target area, the scatter echo of an observation target in the target area is received by a receiving unit, and a correlated imaging device is used for correlating the scatter echo with a microwave radiation field to obtain an inversion image observation target; the microwave pulse signal transmitted by each radiation antenna is the same in the pulse period and the pulse repeating frequency, each microwave pulse signal comprises a plurality of random frequency hopping sub-pulses, a frequency point is selected randomly in a bandwidth range, microwave pulse signals transmitted by different radiation antennas are different in random frequency hopping sub-pulse frequency hopping code speed, and frequency hopping patterns are orthogonal. An ideal time-space two-dimensional random radiation field which is required by microwave stare correlated imaging is realized on the aspect of engineering under the conditions of low code speed transmission, low-speed acquisition and lower bandwidth.

Description

technical field [0001] The invention relates to the technical field of radar imaging, in particular to a microwave staring associated imaging device based on random frequency hopping at different code rates. Background technique [0002] Radar Imaging technology is a leap in the history of radar development. It expands the original detection (Detection) and ranging (Ranging) functions of radar. Panoramic radar imagery. Although synthetic aperture radar (SAR) has high azimuth resolution, its revisit period is long, and it has inevitable inherent disadvantages in scenarios that require long-term (quasi) continuous staring observation and imaging; traditional real aperture radar For staring imaging, its angular resolution is limited by the aperture of the actual antenna array, which limits its practical application. [0003] For microwave staring correlation imaging, an ideal space-time two-dimensional random radiation field is a prerequisite for realizing the above-mentioned...

Claims

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Application Information

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IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 郭圆月王东进田超何学智
Owner UNIV OF SCI & TECH OF CHINA
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