Airborne microwave active and passive soil humidity detector

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...

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

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