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Improved Dick radiometer for detecting stealth plane

An improved radiometer technology, which is applied in the field of microwave remote sensing and precision measurement, can solve the problems of limited sensitivity improvement of radiometers, achieve the effects of shortening physical size, reducing loss, and preventing noise outside the bandwidth

Inactive Publication Date: 2018-11-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this method does not solve the problem of signal loss structurally, so the improvement of the sensitivity of the radiometer is limited

Method used

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  • Improved Dick radiometer for detecting stealth plane
  • Improved Dick radiometer for detecting stealth plane
  • Improved Dick radiometer for detecting stealth plane

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Embodiment Construction

[0016] The detection of stealth aircraft with a radiometer is the detection of weak signals, and the sensitivity directly determines the detection performance of the radiometer. Compared with the full-power radiometer, the Dick radiometer overcomes the influence of the system gain change on the signal input and improves the sensitivity, but in practical applications, the receiving channel will add a bandwidth filter to match the antenna signal, so that the signal in the receiving channel will be There is insertion loss.

[0017] combine figure 1 , the present invention proposes an improved Dicke radiometer that can be used to detect stealth aircraft, including an antenna, a first low-noise amplifier, a second low-noise amplifier, a third low-noise amplifier, a comparison load as a noise source, and a matched filter , Dick switch, square law detector, synchronous detector, square wave generator, switch driver and output circuit, where:

[0018] The antenna and the first low-n...

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Abstract

The invention discloses an improved Dick radiometer for detecting a stealth plane. The improved Dick radiometer includes an antenna, a first low noise amplifier, a second low noise amplifier, a thirdlow noise amplifier, a comparative load, a matched filter, a Dick switch , a square law detector, a synchronous detector, a square wave generator, a switch actuator and an output circuit. To overcomethe defect that a bandwidth filter in the conventional radiometers loses an antenna signal, the bandwidth filter is removed; and in order to prevent the signal from being overwhelmed by noise due to the interference of the Dick switch, the matched filter is added in a reference channel, the structure of the Dick radiometer is optimized and improved so as to improve the sensitivity.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and precision measurement, in particular to an improved Dicke radiometer which can be used to detect stealth aircraft. Background technique [0002] With the rapid development of stealth technology, it has greatly affected the strategic balance. The tactical raid capability of stealth aircraft has forced all countries to explore and discover new anti-stealth technologies. In the cold sky background, the stealth aircraft will become an obvious thermal target because of its own thermal radiation and reflection to the high-temperature background of the ground, and it is easy to be detected by a high-sensitivity microwave radiometer. Therefore, using a microwave radiometer to detect stealth aircraft has It has become an important supplement in many anti-stealth systems. [0003] Compared with the full-power radiometer, the Dick radiometer adds a switch in the design, which can make t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12G01V3/17G01V8/00G01V8/10
CPCG01V3/12G01V3/17G01V8/005G01V8/10
Inventor 肖泽龙王文涛王静许建中吴礼李旺韦清玉
Owner NANJING UNIV OF SCI & TECH
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