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Apparatus and method for signal processing of pico-satellite transmitter

A signal processing and transmitter technology, which is applied in the field of signal processing of pico satellite transmitters, can solve the problems of unfavorable transponder miniaturization, long structural link, large area, etc., and achieve the reduction of a spectrum transfer process, good output characteristics, and simplified area effect

Active Publication Date: 2017-12-01
ZHEJIANG UNIV
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Problems solved by technology

[0006] However, the chain of this structure is relatively long, and two phase-locked loops are required to generate the intermediate frequency local oscillator and the radio frequency local oscillator. , and power consumption have certain disadvantages, which is not conducive to the miniaturization of transponders

Method used

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  • Apparatus and method for signal processing of pico-satellite transmitter
  • Apparatus and method for signal processing of pico-satellite transmitter
  • Apparatus and method for signal processing of pico-satellite transmitter

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Embodiment Construction

[0026] Such as image 3 As shown, a device for pico-satellite transmitter signal processing includes sequentially connected digital-to-analog converters, a first intermediate frequency filter 1, a first intermediate frequency amplifier 2, a second intermediate frequency filter 3, and a second intermediate frequency amplifier 4 , mixer 5, first radio frequency filter 7, first radio frequency amplifier 8, second radio frequency filter 9, second radio frequency amplifier 10, third radio frequency filter 11 and power amplifier 12, and access mixer 5 frequency synthesizer 6.

[0027] The digital-to-analog converter adopts the AD9760 chip, and the maximum sampling frequency is 125MHz, which is responsible for converting the digital baseband signal into an analog signal. The sampling frequency of the digital-to-analog converter is f s , the signal center frequency is f s / 4, select the image signal 7f output by the digital-to-analog converter s / 4, with a center frequency of 7f ...

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Abstract

The invention discloses a method for processing signals of pico-satellite transmitters, which includes the following steps: digital baseband signals are converted into analog signals, image signals in the analog signals are then extracted, filtered and amplified, so that processed image signals are obtained, the processed image signals are mixed with radio frequency local oscillation, so that mixed signals are obtained, and finally, the mixed signals are filtered and amplified, so that radio frequency signals are obtained. The invention also discloses a device for processing signals of pico-satellite transmitters. The invention adopts a primary up-conversion structure to replace the secondary up-conversion structure of the conventional transmitter, dispensing with a first-stage medium-frequency local oscillator and a first-stage mixer on the link, consequently, the area of the circuit is reduced, the power consumption and complexity of the circuit are decreased, the primary spectrum shifting process is reduced, and under the premise of guaranteeing the good output characteristics of a digital-to-analog converter, the invention can effectively enhance the performance and stability of the whole transmission link.

Description

technical field [0001] The invention relates to the field of signal processing of pico-satellite transmitters, in particular to a device and method for signal processing of pico-satellite transmitters. Background technique [0002] Pico-satellites and nano-satellites belong to micro-satellites. This concept was first proposed by the American Aerospace Corporation in 1993, which brought a fundamental change in the design of small satellites. Nano-satellites and pico-satellites are satellites of a new concept based on micro-electromechanical systems (MEMS) technology and ASIMs composed of several MEMS. to below 1kg. Nano-satellites and pico-satellites mainly realize satellite networking through a decentralized constellation structure, realize information sharing during the work process, and can complete many tasks including large-scale spatial mapping, stereoscopic imaging, and distributed aerial news measurement. The characteristics of nano-satellites and pico-satellites ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04B1/06
CPCY02D30/70
Inventor 张朝杰娄延年李建宇金仲和金小军
Owner ZHEJIANG UNIV
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