Intermediate-frequency demodulator adapting to multi-code velocity and having multiple demodulation modes

An intermediate frequency demodulator and code rate technology, applied in the field of demodulators, can solve the problems of inability to adapt to multiple transmission code rates and demodulation methods, single performance of intermediate frequency demodulators, poor scalability, etc., to increase flexibility , Improving demodulation performance and reducing power consumption

Inactive Publication Date: 2008-04-02
NAT SPACE SCI CENT CAS
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of existing IF demodulators such as single performance, poor scalability, lack of flexibility, and inability to ada

Method used

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  • Intermediate-frequency demodulator adapting to multi-code velocity and having multiple demodulation modes
  • Intermediate-frequency demodulator adapting to multi-code velocity and having multiple demodulation modes

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Embodiment Construction

[0019] The IF demodulator of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] As shown in Figure 2, the IF demodulator of the present invention is composed of anti-aliasing filter 1, analog-to-digital converter 2, quadrature tuner 3, digital Costas (Costas) ring 4, clock and baseband signal processing circuit 5 , Composed of 6 single-chip microcomputers. Wherein, the anti-aliasing filter 1 is connected with the external intermediate frequency filter, the anti-aliasing filter 1, the analog-to-digital converter 2, the quadrature tuner 3, the digital Costas ring 4, the clock and the baseband signal processing The circuit 5 is electrically connected sequentially, and the single-chip microcomputer 6 is electrically connected to the quadrature tuner 3 and the digital Costas ring 4 respectively.

[0021] Since the signal is prone to aliasing during analog-to-digital (A / D) conversion, t...

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Abstract

The present invention discloses a intermediate frequency demodulator which is suitable for multicode speed and has a plurality of demodulating modes, including: orthogonal tuner, Costas loop, clock and baseband signal treatment circuit, anti-aliasing filter, analog-digital convertor and singlechip; The Costas loop is digital Costas loop; the anti-aliasing filter connects with the outer intermediate frequency filter wherein; the anti-aliasing filter, the analog-digital convertor, the orthogonal tuner, the Costas loop, the clock and the baseband signal treatment circuit connect with each other by electricity in order; the singlechip connects with the orthogonal tuner as well as the Costas loop. The present invention uses the digital orthogonal tuner and digital Costas loop and singlechip to replace analog orthogonal tuner, Costas loop, to implement demodulation of intermediate frequency signal of a plurality of code speed and modulating modes. Compared with the existing intermediate frequency demodulator, the present invention adds flexibility, improves demodulation performance, reduces volume and weight as well as power consumption.

Description

technical field [0001] The invention relates to a demodulator applied to wireless data communication, in particular to an intermediate frequency demodulator adapted to multi-code rates and having multiple demodulation modes applied in a wireless receiving system. Background technique [0002] The wireless data communication system is one of the important systems in the field of aerospace science, it completes the data communication function between various space vehicles and the ground. The ground detection and receiving system is used to detect the bit error performance of the data transmission transmitter used on the aircraft, so as to ensure that the data transmission transmitter is in a normal working state before the aircraft launches. The ground detection and receiving system is composed of antenna, high frequency amplifier, high frequency filter, mixer, intermediate frequency amplifier, intermediate frequency filter, intermediate frequency demodulator, baseband signal...

Claims

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Application Information

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IPC IPC(8): H04L27/14
Inventor 屈晨阳郭丽莉谢春坚陈晓敏孙辉先
Owner NAT SPACE SCI CENT CAS
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