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Synthetic-aperture-radiometer-based distributed digital interferometer system

An interference system and synthetic aperture technology, applied in the directions of utilizing re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problems of large structure and high computational complexity, optimize system structure and simplify system design , to avoid the effect of redesign

Active Publication Date: 2017-04-05
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problem of high computational complexity and huge structure caused by the integrated design of the existing digital interference system. The present invention provides a distributed digital interference system based on a synthetic aperture radiometer. Using this system, the digital correlation unit is modularized, and each module is flexibly distributed in the system structure, so as to realize the interference correlation calculation of each channel in the radiometer receiver in a distributed manner

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Embodiment 1

[0039] This embodiment provides a 30-channel-scale interferometric system solution, each channel having a sampling rate of 5Gb / s. The distributed digital interference system is divided into 5 sub-array modules and 10 inter-array modules, each sub-array module is assigned 6 channels, and the sub-array modules complete the calculation of data autocorrelation within 6 channels and data cross-correlation between channels . The inter-array module completes the channel data cross-correlation calculation between two sub-array modules.

[0040] The block diagram of the subarray module structure is as follows: Figure 4 As shown, because the sampling rate in this embodiment reaches 5Gb / s, an ultra-high-speed ADC is required to complete data acquisition. In this embodiment, the sub-array module includes: an A / D converter and an interference correlation calculation module; the digital sampling in the sub-array module is completed by e2v's EV8AQ160 chip. EV8AQ160 has the characteristic...

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Abstract

The invention provides a synthetic-aperture-radiometer-based distributed digital interferometer system. The system comprises a plurality of sub array modules, a plurality of inter-array modules, and a digital distribution aggregation hub module. According to the distributed digital interferometer system, all channels in a radiometer receiver are distributed to all sub array modules according to the set number; all the sub array modules carry out digital collection of distributed data in all channels and complete data autocorrelation in channels and data cross-correlation calculation between channels; the digital distribution aggregation hub module distributes the digital signals collected by the sub array modules combined in pairs to all the inter-array modules and receives data correlation calculation results of the sub array modules and the inter-array modules; and the inter-array modules complete data cross-correlation calculation of channels in pairs between the sub array modules. Using the system provided by the invention, the massive interference correlation calculation can be split into multiple groups of intra-sub-array correlation and inter-array correlation calculation, so that the system design is simplified and the system structure is optimized.

Description

technical field [0001] The invention relates to the field of synthetic aperture radiometers, in particular to a distributed digital interference system based on synthetic aperture radiometers. Background technique [0002] Microwave remote sensing is to use a certain sensor to receive microwave signals emitted or reflected by various geographical objects, identify and analyze the target object, and extract the information required by the target object. Microwave remote sensing started later than visible light and infrared remote sensing. Compared with visible light and infrared remote sensing, microwave equipment can work around the clock. Visible light remote sensing can only work during the day, while infrared remote sensing can work at night, but it cannot penetrate clouds and fog. The microwave radiometer is a passive microwave remote sensing device. The microwave radiometer is mainly used for monitoring small and medium-scale weather phenomena, such as storms, lightnin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 陆浩刘浩
Owner NAT SPACE SCI CENT CAS
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