Efficient superspeed effective load data transmission system for remote sensing satellite

Abstract

The invention provides an efficient superspeed effective load data transmission system for a remote sensing satellite. The efficient superspeed effective load data transmission system comprises a variable bit rate coding module, a data modulation multiplexing module, a microwave signal transmitting module and a system control module; the system control module calculates an encoding rate of a low-density parity-check code, a modulation order of amplitude phase shift keying and a turntable angle of a bearing antenna according to the relative positions of a satellite and a ground station; the variable bit rate coding module finishes channel coding of effective load data, and constitutes a data transmission frame; the data modulation multiplexing module realizes amplitude phase shift keying modulation of the data transmission frame, and performs orthogonal frequency division multiplexing on a transmission code element signal on a plurality of sub channels, after that, the transmission code element signal becomes a data modulated carrier signal; and the microwave signal transmitting module converts the data modulated carrier signal into a data modulated radio frequency signal through frequency spectrum shifting, outputs a space electromagnetic wave of a certain power, and keeps an antennae beam to automatically track the ground station; and therefore, a transmission bit rate of a Gbps magnitude can be realized.

Description

technical field [0001] The invention relates to the technical field of near-earth remote sensing satellites, in particular to an efficient and ultra-high-speed payload data transmission system for remote sensing satellites. Background technique [0002] With the development of high-resolution images of remote sensing satellite payloads and comprehensive detection technology, the payload data transmission system from satellites to the ground is facing the demand for higher and higher code rates. The International Telecommunications Union (ITU) has allocated S-band 2200-2290MHz, X-band 8025-8400MHz and Ka-band 25.5-27GHz spectrum resources to remote sensing satellites for payload data transmission. The existing payload data transmission system uses a single carrier four Phase shift keying (QPSK) performs signal modulation, but the QPSK modulation order is 2, that is, a transmission symbol only contains 2 data bits, and the spectrum utilization rate is low; it has been applied ...

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Problems solved by technology

[0004] The object of the present invention is to solve the defect that the existing payload data transmission system cannot realize the transmission code rate of the Gbps order on the X-band 375MHz bandwidth allocated by the ITU, and then provide a kind of high-efficiency ultra-high speed for remote sensing satellites Payload data transmission system, efficiently realize ultra-high-speed transmission code rate of Gbps level

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