Measurement Of AoA And Broadband Lower-IF RF Receiver Based On Microwave Photonics

Photonic measurement based on microwave of the Angle of arrival can improve the bandwidth,power consumption,volume and electromagnetic influence of electronic technology.Broadband lower-IF RF receiver based on microwave photonic mixer can receive signals with large bandwidth and wide frequency range,which is hopeful to break the bandwidth bottleneck of electrical receivers.According to the development needs of radio system and the advantages of microwave photonics,this paper studies the measurement of arrival Angle and wideband low IF receiving technology by microwave photonics.The specific researches are as follows:1.In this chapter,we describe the origin and development of microwave photonics,and briefly describe the history and research trend of measuring of Angle of Arrival and wideband low IF receiving technology.At the same time,the classical microwave Ao A measuring and wideband lower IF frequency receiving schemes published by universities and research institutions at home and abroad in recent years are summarized and analyzed.2.In this chapter,based on the simple link of microwave photonics,we give a detailed introduction to the key devices used in different modules,which mainly introduces the principle and theoretical derivation of the classical core modulator,then analyzes the principle and error source of the classical phase interferometer system in electrical measurement of Angle of Arrival.3.In the microwave photonic measurement system,it is very imporant to measure the Angle of arrival and the Doppler frequency shift of microwave signals.Based on the phase detection scheme of phase interferometer,a simple microwave photonic system which can simultaneously measure the Ao A and DFS of RF signals is proposed.The optical carrier is divided into two branches,the upper and lower channels respectively use DDMZM modulator and PM modulator to mark the echo signal and the reference signal,the positive first order sideband of both are filtered by optical filter.Then the low-frequency signal after mixing in the electrical domain is processed.the proposed scheme is simulated and verified.When the Ao A measurement range is 0?70.81°,the measurement error is <±0.45 °.4.Analog receiver is faced with the demand of receiving and processing wideband signals.Based on microwave photonics and Kramer-Kronig detection method,a simple low cost and low complexity low IF receiver that can receive wideband RF signals is proposed,In the process of simulation verification,By comparing the EVM before and after KK detection,we verify the performance of the proposed wideband IF signal receiver EVM is measured as a function of different IF frequencies,input local oscillator power and input RF power.When the frequency is close to half of the signal bandwidth,the EVM of the useful signal can be increased by more than 10.12% with KK detection.5.Photonic integrated circuits have significant advantages in terms of system loss,cost and reliability by combining components with connecting tiny components on a single substrate.Based on the development of integrated photonics,the author uses the photonic integration simulation software to verify the integration feasibility of the microwave photonic system proposed in Chapter 3 and Chapter 4.