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Probe signal processing method and device for high and low orbit SAR constellation

A probe signal and signal technology, which is applied in the field of probe signal processing of high and low orbit SAR constellations, can solve the problems of complex SAR imaging geometric model, uncontrollable, difficult dual-star transmission delay, etc., and achieve low-cost and high-precision measurement of the distance between double stars Effect

Active Publication Date: 2022-05-24
CHINA ACADEMY OF SPACE TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The introduction of the forwarding mode leads to the binary star transmission delay that is difficult to calculate accurately in the observation geometric model, making the SAR imaging geometric model complex and uncontrollable

Method used

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  • Probe signal processing method and device for high and low orbit SAR constellation
  • Probe signal processing method and device for high and low orbit SAR constellation
  • Probe signal processing method and device for high and low orbit SAR constellation

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Embodiment Construction

[0075] Embodiment of the present application for analog transponder high - low orbit SAR constellation probe signal processing method, specifically comprising the following processing content:

[0076] Content 1: Connect the inter-satellite link antenna port to a low-band band-pass filter to receive the transmitted signal of a geostationary orbit satellite and isolate the high-band forwarding signal.

[0077] Content 2: The automatic gain operational amplifier is connected after the band-pass filter, and the received signal is appropriately amplified to form a probe signal.

[0078]Content three: the probe signal is connected to the adder, mixed with the object echo signal, and connected to the mixer for conventional up-regulation forwarding.

[0079] Figure 1 Schematic diagram of the probe signal module design for analog transponder high and low orbit SAR constellations provided for the present application embodiment, e.g., Figure 1 As shown, the number 1 represents a geostation...

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Abstract

This application discloses a probe signal processing method and device for high and low orbit SAR constellations. The method includes: connecting the inter-satellite link antenna port to a low-frequency band-pass filter, receiving transmission signals from geostationary satellites, and isolating Transmit the signal in the high frequency band; the signal processed by the low frequency band pass filter is connected to the automatic gain operational amplifier, and the signal processed by the low frequency band pass filter is amplified to form a probe signal; the probe signal is connected to the adder After being mixed with the ground object echo signal, it is connected to the mixer, and the frequency is modulated by the mixer and then forwarded by the geostationary satellite. Due to the double difference between the probe signal delay and the echo compensation delay, the probe signal interference exists obliquely in the two-dimensional echo, so the final imaging result will not be affected after the signal is removed.

Description

Technical field [0001] Embodiments of the present application relate to a probe signal processing technology for high and low orbit synthetic aperture radar constellations, in particular to a probe signal processing method and apparatus for high and low orbit SAR constellations. Background [0002] Synthetic Aperture Radar (SAR) is an important part of space-based remote sensing, which actively transmits microwave signals and receives scattered echoes from ground targets, resulting in high-resolution images of the ground through imaging processing. Relying on the active penetration characteristics of microwaves, it can penetrate the occlusion of clouds and rain, ignore the sunlight conditions, and observe the earth all day and all day. In recent years, with the development of science and technology and social progress, space-based radar systems have been widely used in all aspects of military and civilian use, and have played an important role in marine monitoring, disaster preve...

Claims

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Application Information

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