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

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...

AI Technical Summary

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 adapt to various transmission code rates and demodulation methods, thereby providing a high-performance, low-cost, and fast IF demodulator adapting to changes in different communication systems

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