一种提高卫通变频器本振泄露抑制结构

Abstract

本实用新型涉及射频通信技术领域，尤其公开了一种提高卫通变频器本振泄露抑制结构，包括依次串联电性连接的第一滤波模块、第一信号调整模块、混频模块、第二信号调整模块以及第二滤波模块；所述第一滤波模块用于对输入的中频信号进行带通滤波，滤除干扰信号，第一信号调整模块用于调节第一滤波模块过滤后的信号功率使其处于预设范围，所述混频模块用于将所述第一信号调整模块输出的信号与本地振荡信号进行混频，实现频率转换后输出混频信号，第二信号调整模块用于调节混频模块输出的混频信号功率使其处于预设范围，第二滤波模块用于对第二信号调整模块调节后的信号再次带通滤波，以滤除本振泄露信号后输出满足本振泄露抑制要求的发射射频信号。

Claims

1. A structure for improving local oscillator leakage suppression in a Weitong frequency converter, characterized in that: The system includes a first filter module (1), a first signal adjustment module (2), a mixer module (3), a second signal adjustment module (4), and a second filter module (5) connected in series and electrically. The first filter module (1) is used to perform bandpass filtering on the input intermediate frequency signal to filter out interference signals. The first signal adjustment module (2) is used to adjust the power of the signal filtered by the first filter module (1) to make it within a preset range. The mixer module (3) is used to mix the signal output by the first signal adjustment module (2) with the local oscillator signal to achieve frequency conversion and output a mixed signal. The second signal adjustment module (4) is used to adjust the power of the mixed signal output by the mixer module (3) to make it within a preset range. The second filter module (5) is used to perform bandpass filtering on the signal adjusted by the second signal adjustment module (4) again to filter out the local oscillator leakage signal and output a transmit radio frequency signal that meets the local oscillator leakage suppression requirements.

2. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The first signal adjustment module (2) includes a first amplification module (6) connected in series with the first filtering module (1), a first digital attenuation module (7) connected in series with the first amplification module (6), and a second amplification module (8) connected in series with the first digital attenuation module (7). The first amplification module (6) is used to perform initial power amplification on the filtered intermediate frequency signal to compensate for signal loss during transmission and filtering. The first digital attenuation module (7) is used to perform precise digital attenuation adjustment on the amplified signal to adjust the signal power to a preset range in order to optimize the signal power level and reduce nonlinear distortion in the subsequent mixing process. The second amplification module (8) is used to perform secondary power amplification on the attenuated signal so that the signal power reaches the input level required by the mixing module (3).

3. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The second signal adjustment module (4) includes a second digital attenuation module (9) connected in series with the mixing module (3) and a third amplification module (11) connected in series with the second digital attenuation module (9). The second digital attenuation module (9) attenuates and adjusts the signal after it has been processed by the mixing module (3) to control the signal power. The third amplification module (11) amplifies the signal after it has been attenuated by the second digital attenuation module (9) so that the signal power reaches the input level required by the second filtering module (5).

4. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The suppression structure also includes a fourth amplification module (12), which is connected in series with the output of the second filter module (5). The fourth amplification module (12) is used to perform final power amplification on the signal processed by the second filter module (5) so that the signal power reaches the target power level that meets the transmission requirements.

5. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The suppression structure also includes a signal monitoring module, which is electrically connected to the input terminal of the first filtering module (1), the output terminal of the mixing module (3), and the output terminal of the second filtering module (5).

6. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 5, wherein: The signal monitoring module includes a local oscillator leakage detection unit. The local oscillator leakage detection unit identifies the amplitude of the local oscillator frequency component in the output radio frequency signal through spectrum analysis and compares it with a preset threshold. When the local oscillator leakage amplitude exceeds the threshold, an adjustment command is generated to the second digital attenuation module (9) to dynamically increase the attenuation amount to suppress local oscillator leakage.

7. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The mixer module (3) is provided with a metal shield, and the inner wall of the metal shield is plated with a high permeability alloy layer with a thickness of 0.1-0.3mm to suppress the spatial radiation leakage of the local oscillator signal.

8. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The suppression structure also includes a temperature compensation module, which is electrically connected to each module. The temperature compensation module monitors the ambient temperature and the operating temperature of each module in real time, and dynamically adjusts the operating parameters of each module according to temperature changes.

9. The structure for suppressing leakage of a local oscillator of a satellite telephone frequency converter according to claim 1, characterized in that: The first filtering module (1) and the second filtering module (5) are bandpass filters.

10. The structure for suppressing leakage of a local oscillator of a satellite communication frequency converter according to claim 1, characterized in that: The suppression structure also includes a fault diagnosis and early warning module; the fault diagnosis and early warning module is electrically connected to each module, monitors the working status and parameters of the module in real time, and issues an early warning signal in a timely manner when a fault or abnormal parameter is detected in the module.

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