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Large-modulation index satellite-borne digital frequency modulating receiver

A modulation index and receiver technology, applied in FM carrier systems, radio transmission systems, electrical components, etc., can solve the problems of reducing the reliability of the whole machine, complex circuit structure, large temperature drift and DC drift, etc. Effect

Active Publication Date: 2014-05-28
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, its circuit debugging is difficult, poor stability, large temperature drift and DC drift
The circuit needs to adopt more compensation measures, which makes the circuit structure complex, reduces the reliability of the whole machine, and is difficult to meet the long life and high reliability requirements of communication satellites

Method used

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  • Large-modulation index satellite-borne digital frequency modulating receiver
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  • Large-modulation index satellite-borne digital frequency modulating receiver

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Embodiment Construction

[0016] Aiming at the characteristics of large modulation index and multi-Puller frequency shift in the uplink frequency modulation mode of the satellite measurement and control channel, the invention designs a space-borne digital frequency modulation receiver. By using the modulation tracking loop and carrier tracking loop in the radio frequency part, the large modulation index and large Doppler frequency shift FM microwave signal is converted into a small modulation index and small Doppler frequency shift intermediate frequency signal, and the small modulation index intermediate frequency signal is regenerated The intermediate frequency digital frequency discriminator based on the CORDIC algorithm is used to realize signal demodulation, so as to achieve the purpose of digitizing the satellite-borne digital FM receiver.

[0017] 1. System design

[0018] In order to maintain the consistency with the external interface of the current space-borne C-band FM receiver, the typical ...

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Abstract

The invention relates to a large-modulation index satellite-borne digital frequency modulating receiver which comprises a low-noise amplifier, a first down frequency converter, an intermediate frequency amplifier, a second down frequency converter, a first frequency multiplier, a second frequency multiplier, an automatic gain controller, a voltage-controlled oscillator and an intermediate frequency digital processing module. In the invention, the intermediate frequency digital processing module is adopted instead of the traditional phase discriminator, the digital demodulation of a signal is realized by adopting the intermediate frequency discriminator based on a CORDIC (Coordinated Rotation Digital Computer) algorithm, and thus various problems brought by a stimulating circuit are solved fundamentally. The receiver disclosed by the invention has the advantages of simple structure and high reliability and can meet the requirements of long service life and high reliability of a communication satellite.

Description

technical field [0001] The invention relates to a space-borne FM receiver. Background technique [0002] High-orbit communication satellites generally complete their measurement and control functions based on the internationally accepted C-band measurement and control network. As the basic satellite channel of measurement and control signals, the working system of the satellite-borne C-band receiver is frequency modulation (FM) system. That is, the uplink ranging signal and the remote control subcarrier signal modulate the frequency of the uplink 6GHz carrier signal, and the working system of the spaceborne C-band transmitter is a phase modulation (PM) system, that is, the downlink ranging signal and the telemetry subcarrier signal modulate the phase of the downlink 4GHz signal. For the uplink signal, the receiver needs to complete the demodulation of the uplink remote control subcarrier signal and the ranging signal, and send the demodulated remote control subcarrier signa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/14H04B7/185
Inventor 李威安卫钰李明峰
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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