Apparatus of generating microwave phase coding signals in an optical manner

Abstract

The invention discloses an apparatus of generating microwave phase coding signals in an optical manner, and relates to the microwave technology field and the optical communication technology field. The apparatus is mainly applied to generating pulse compression signals in pulse compression radar. By means of the frequency shift characteristics of two parallel Mach-Zehnder modulators, the optical wavelength modulated by coding signals and the optical wavelength after a frequency shift are coupled to each other and then are detected through a photoelectric detector, in this way, phase coding microwave signals can be generated. The apparatus can produce binary, quaternary or multi-nary phase coding microwave signals. The generated phase coding microwave signals are wide in frequency adjustable scope, and have a great time-bandwidth product. A conventional phase coding microwave signal generation mode in the electric field is restricted by the bottleneck of the rate and the bandwidth of an electronic device, and the cost of generation of high frequency signals is extremely high or high frequency signals cannot be produced, the time-bandwidth product is limited, the reconstructiblity and the frequency adjustability of a system are poor, etc. The apparatus of the invention helps to overcome the above problems.

Description

technical field [0001] The invention relates to the field of microwave technology and the field of optical communication technology, in particular to a device for optically generating microwave phase encoding signals. Background technique [0002] With the rapid development of radar technology, the requirements for radar operating range, resolution capability and measurement accuracy are getting higher and higher. The resolution theory of radar shows that: on the premise of ensuring a certain signal-to-noise ratio and achieving the best processing, the ranging accuracy and distance resolution mainly depend on the spectral structure of the signal, which requires the signal to have a large bandwidth; the speed measurement accuracy and speed resolution Depending on the temporal structure of the signal, it requires the signal to have a large duration. Therefore, in order to make the radar system have a long range and have high range and speed measurement accuracy and good dista...

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Problems solved by technology

The above methods can only generate binary phase encoding signals. In order to generate multi-ary phase encoding signals, an arbitrary waveform generation system based on photoelectric oscillators is proposed. This method can generate frequency-adjustable binary and quaternary phase encoding signals. , but the frequency adjustable range of this scheme is limited by the phase-shifted fiber Bragg grating used in the system, and since the system frequency tuning is realized by changing the wavelength of the optical signal, its long-term working stability is limited by the wavelength stability of the light source

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