The Study Of Microwave Photonic Instantaneous Frequency Measurement

In recent years, electronic warfare has occupied a place in modern wars, and theinstantaneous frequency measurement is the premise of electronic warfare whichshould be given attention and research. Microwave photonic instantaneous frequencymeasurement can analysis the information of the enemy electromagnetic accurately,thus attain the goals of detection, defense, attack. As the rapidly development ofinformation technology, the traditional electronic frequency measurement technologycannot adapt to a rapidly changing environment gradually, because of the inherentelectronic bottleneck.Microwave photonics is a cross emerging discipline which is the combination ofmicrowave and photonics, because of the advantages of both microwave andphotonics, the system based on microwave photonics has many natural advantages:lager bandwidth, low loss, small volume, reconfigurable, resistance toelectromagnetic interference, etc.Firstly, we will introduce the theory and the specific classification of electronicwarfare, and introduce the advantages and applications of microwave photonics;finally we will introduce the development of microwave photonics frequencymeasurement technology. We will introduce the principle of the key devices which arethe applications in the measurement system, and all kinds of modulation mode will bedescribed. We will describe the stimulated Brillouin scattering effect, and measure theBrillouin frequency shift, the result is9.2GHz; and then a system will be built whichis to verify the compensation scheme based on two pumps.By the application of two pumps, the measurement range of the system isextended from2VBto4VB; the error is less than3MHz, and as a result, themeasurement resolution and error are39.93MHz and1.6MHz respectively when thetwo frequencies are input simultaneously. A measurement scheme based on intensity modulator is analyzed and stimulated,in7.5to14GHz and14to20GHz, the error is less than0.4GHz; and then a tunablemeasurement scheme based on chirp coefficient is introduced. From the range of10to25GHz, the movement of the measurement range is achieved, and the flexibility ofthe system is greatly increased.