【摘要】 介绍了混合模拟信号和噪声的情况下提取通信卫星数字信号的方法。由于信号频率、3d B带宽、信噪比和信号电平属于待测参数 ,因此需要程控频谱仪自适应地调整扫描带宽 ,以正确测量出数字信号的频率、3d B带宽和信噪比等特征。实践证明 ,该方法相对于人工读取频谱仪方法具有效率高、准确率高和实时性等优点。更多还原

【Abstract】 digital signals with different frequency, bandwidth and SNR(signal to noise ratio)from satellite information containing analog signals and noise,the spectrum analyzer must adaptively adjust its span to measure the unknown signals. It proposes a method to remotely control the spectrum analyzer to display only one digital signal in a frame for correctly measuring the digital signal’s frequency, 3dB bandwidth and SNR. Practice demonstrates the presented real-time method is more efficient and accurate than the manual method.更多还原