基于异步光取样的频率空间压缩法瞬时测频方法

瞬时测频技术是一项重要的电子技术。首次提出了一种基于异步光取样的频率空间压缩法瞬时测频方法。测量带宽可以从直流到40GHz,实验结果表明,响应曲线基本保持平坦响应,测频精度超过0.5MHz,可同时测量多个载波信号频率,在0.2μs或者更短时间内就可以完成一次测频。数值模拟表明,抗噪声性能可达-13dB以上,可以提取掩藏在100倍功率人为干扰中的有用信号频率。

Instantaneous frequency measurement based on frequency space compression and asynchronous optical sampling

Instantaneous frequency measurement(IFM) is one of the most important technologies in electronic war today.An IFM method based on optical asynchronous sampling and frequency space compression is proposed. This new IFM method's bandwidth is broader than 40GHz,while response curve can keep flat with in its bandwidth. And the precision of this new IFM method is more than 0.1MHz. When the signal to noise rate (SNR) is less than-13dB,the system still can measure the signal's frequency. The IFM can measure more than 4 kinds of frequency in the wireless signal at one time. When the interfering signal's power is more than 100 times of useful signal's,this new method still can measure the useful signal's frequency.The measurement can be finished in lees than 0.2μs.