Airborne microwave active and passive soil humidity detector

A soil moisture, active and passive technology, applied in the direction of using microwaves to test moisture content, etc., can solve the problems of low time resolution, low spatial resolution, and the inability to meet the requirements of obtaining high-precision and high-resolution soil moisture alone, so as to reduce the The effect of time-of-flight and increased detection width

Active Publication Date: 2020-01-24
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003]Active microwave remote sensing has many advantages in soil moisture estimation, but there are some problems such as low time resolution, less research on vegetation areas and low accuracy
The algorithm of passive microwave remote sensing used to monitor the soil moisture content on the land surface is relatively mature, and its biggest application limitation lies in the low spatial resolution
Neither radar nor radiometer alone can meet the requirement of obtaining high-precision and high-resolution soil moisture

Method used

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  • Airborne microwave active and passive soil humidity detector
  • Airborne microwave active and passive soil humidity detector
  • Airborne microwave active and passive soil humidity detector

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Embodiment Construction

[0019] The airborne microwave active and passive soil moisture detector provided by the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific instructions are given. operation process, but the scope of protection of the present invention is not limited to the following embodiments, those skilled in the art can modify and embellish it within the scope of not changing the spirit and content of the present invention.

[0020] Please refer to figure 1 , the airborne microwave active and passive soil moisture detector includes: active antenna 1, dual-channel TR component 5, exciter and front power supply 4, frequency synthesis transceiver 3, calibration delay device 2, load computer 12, ground test equipment 13. Passive antenna 6, L-band bandpass filter 7, passive receiver 8, noise source 9, p...

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Abstract

The invention discloses an airborne microwave active and passive soil humidity detector. After a ground radiation signal is received by a passive antenna, active emission is inhibited by an L-band bandpass filter, the passive receiver realizes low-noise radio frequency amplification and low-frequency amplification after detection integral, an output voltage value is collected by a preprocessor andpower supply combination and then sent to a load computer, and finally the ground radiation signal is stored and processed by ground test equipment; a chirp signal generated by a frequency synthesizer transceiver is amplified by a dual-channel TR component and then fed to the active antenna, a transmitted signal is received by the active antenna after being reflected through the ground, and the transmitted signal is received and amplified by the dual-channel TR component and the frequency synthesizer transceiver and then collected by the load computer and sent to ground test equipment for data storage. According to the airborne microwave active and passive soil humidity detector, synchronous detection of active radar and a passive radiometer for soil humidity can be realized, active and passive real-time calibration is carried out in an observation period, active and passive data are fused, and the observation requirements of high precision and high resolution of soil humidity are met.

Description

technical field [0001] The invention relates to a soil moisture detector in the field of microwave remote sensing technology, in particular to an airborne microwave active and passive soil moisture detector. Background technique [0002] The airborne microwave active and passive soil moisture detector is a combination of active and passive microwave remote sensors, which is a microwave instrument used to measure soil moisture on the aircraft platform. Airborne microwave active and passive soil moisture detectors can observe soil moisture all day and all weather. Soil moisture is the key to driving the three major circulation systems of water, carbon and energy in the world. High-precision and high-resolution soil moisture products are the key to realizing The core of comprehensive monitoring of terrestrial surface water and soil water, providing data support for water cycle monitoring, early warning of floods and droughts, agriculture and forestry monitoring, and disaster pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 孙彦龙栾英宏徐红新赵锋姚崇斌冯剑锋刘瑞李丹赵永涛
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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