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High-Low Orbit SAR Satellite Joint Observation System Based on Analog Transmit Mode

A forwarding mode and observation system technology, applied in the field of remote sensing, can solve problems such as difficulties in efficient imaging processing of two-dimensional space-time variation characteristics, inability to obtain images, and no substantial improvement in the application efficiency of SAR images, etc., to achieve easy high-frequency revisiting ability, high-frequency revisit ability, and the effect of facilitating large-scale networking

Active Publication Date: 2021-06-11
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

However, the relative motion of the GEO-SAR satellite and the earth is relatively slow, and its Doppler accumulation time is extremely long, resulting in strong defocusing of slightly moving objects, making it impossible to obtain clear images; brought great difficulty
Therefore, although GEO-SAR improves the revisit and gaze capabilities, it does not substantially improve the application performance of SAR images

Method used

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  • High-Low Orbit SAR Satellite Joint Observation System Based on Analog Transmit Mode
  • High-Low Orbit SAR Satellite Joint Observation System Based on Analog Transmit Mode

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Embodiment Construction

[0023] The high-low orbit SAR satellite joint observation system based on the analog forwarding mode includes the following contents:

[0024] Content 1: Geostationary Satellite Payload Composition

[0025] Geostationary orbit satellite payloads include broadband chirp generator, high power X-band transmitter, massive X-band phased array antenna, small Ka-band receive antenna, Ka-band down-mixer, X-band receiver, high-speed AD Sampling and memory.

[0026] Content 2: Composition of low-orbit analog forwarding satellite payload

[0027] The low-orbit analog transponder satellite payload includes a mesoscale X-band receiving antenna, a Ka-band analog up-mixer, a low-power Ka-band transmitter, and a small Ka-band transmitting antenna. Because low-orbit satellites use analog conversion systems as payloads, large-scale power supply equipment, high-power signal transmitters, high-speed AD sampling and storage systems, etc. are eliminated. Compared with traditional SAR satellites, ...

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Abstract

A high-low orbit SAR satellite joint observation system based on analog forwarding mode belongs to the field of remote sensing technology. The invention utilizes geostationary orbit satellites to irradiate the observation area, and low-orbit satellites to receive ground object echoes and forward them to high-orbit satellites to realize fast Doppler accumulation. Low-orbit satellites only achieve analog forwarding capabilities, and do not have high-power transmitters, large-scale solar panels, and high-speed AD sampling / storage equipment, which can greatly reduce manufacturing costs and facilitate multi-satellite network reception. Through the establishment of a geostationary orbit launch-low-orbit network forwarding-geostationary orbit satellite receiving system, low-cost, high-time microwave imaging observations have been realized, and the application capabilities of SAR in remote sensing science have been greatly expanded.

Description

technical field [0001] The invention relates to a high-low orbit SAR satellite joint observation system based on an analog forwarding mode, and belongs to the technical field of remote sensing. Background technique [0002] Synthetic Aperture Radar (SAR) is an important part of space-based remote sensing. It actively transmits microwave signals and receives scattered echoes from ground targets, and obtains high-resolution images of the ground through imaging processing. Relying on the active penetration characteristics of microwaves, it can penetrate the shielding of clouds and rain, ignore the conditions of sunlight, and observe the earth all day and all weather. In recent years, with the development of science and technology and social progress, space-based radar systems have been widely used in various aspects of military and civilian use, and have played an important role in marine monitoring, disaster prevention and reduction, vegetation census, scientific archaeology, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9058
Inventor 肖鹏刘波
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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