Researching and optimizing key technology of HDR analog signal chain in the satellite communications

Shuai Zhang1; Shilei Sun1; Yongqiang Cui2; Dexiang Deng2

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Researching and optimizing key technology of HDR analog signal chain in the satellite communications

机译：卫星通信HDR模拟信号链的研究与优化关键技术

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—Due to the low dynamic range of the analog front end, low respond speed, bad flatness of the Amplitude-frequency characteristics and the poor noise suppression capability of the signal conditioning in the analog signal chain of the traditional digital down converter (DDC) system, an improved analog signal chain scheme used in high data rate receiver (HDR) of the satellite communication system has been put forward. This scheme has 55dB dynamic range, high respond speed and good noise suppression capability. Moreover, it has been realized on the platform of the ground terminal HDR for demodulator system. 720MHz and 1.2GHz intermediate frequency conversion is an important component of the satellite ground monitoring X-band data channel receiver system. The scheme consists of a band-pass filter module, a digital control variable gain amplifier (VGA), a low noise amplifier (LNA), a radio or intermediate frequency gain block and an ADC which has 1.7GHz input bandwidth. It realizes sampling and conditioning of the 720MHz and 1.2GHz intermediate frequency signal and automatic gain control (AGC). Experimental results show that the scheme has the characteristics: automatic and fast gain control, wide dynamic range and good amplitude-frequency characteristics of the gain points in the pass-band, low power consumption and good noise suppression capability.

机译：- 在模拟前端的低动态范围内，低响应速度，幅度频率特性的差，噪声抑制能力差的传统数字卸下转换器（DDC）系统的模拟信号链中的信号调节差，已经提出了一种在卫星通信系统的高数据速率接收器（HDR）中使用的改进模拟信号链方案。该方案具有55dB动态范围，高响应速度和良好的噪声抑制功能。此外，它已经在接地端子HDR的平台上实现了解调器系统的平台。 720MHz和1.2GHz中频转换是卫星接地监控X波段数据通道接收机系统的重要组成部分。该方案包括带通滤波器模块，数字控制可变增益放大器（VGA），低噪声放大器（LNA），无线电或中频增益块以及具有1.7GHz输入带宽的ADC。它实现了720MHz和1.2GHz中频信号和自动增益控制（AGC）的采样和调节。实验结果表明，该方案具有特点：自动快速增益控制，宽动态范围和良好的幅度频率特性，增益点，低功耗和良好的噪声抑制能力。

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《Journal of Computers》 |2014年第5期|共7页
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Shuai Zhang1; Shilei Sun1; Yongqiang Cui2; Dexiang Deng2;
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Researching and optimizing key technology of HDR analog signal chain in the satellite communications

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