Beam scanning optically controlled phased array radar based on optical switch
An optically controlled phased array and beam scanning technology, applied in the field of microwave photonics, can solve problems such as beam offset and large volume, and achieve the effect of scanning angle control and fast switching
Active Publication Date: 2021-01-08
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology
In addition, the radio frequency electronic beamforming network is huge in size, and the phase of the radio frequency signal controlled by the phase shifter is prone to beam offset, and the instantaneous bandwidth of the signal is limited by the aperture transit time. To resist anti-radiation missile attacks and solve the problem of multi-target imaging, phased array radar must use broadband signals with large instantaneous bandwidth
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[0021] see figure 1 As shown, the present invention provides a beam scanning optically controlled phased array radar based on an optical switch, including:
[0022] A multi-wavelength laser 1. The wavelength of each optical carrier in the multi-wavelength laser 1 can be independently controlled. According to the requirements, each output terminal of the multi-wavelength laser 1 is selected and set so that the interval between adjacent wavelengths is kept at 0.1 nm. The frequency is 1545nm, the amplitude and phase of each optical carrier output are consistent, and each optical carrier is continuous light in time;
[0023] A wavelength switching unit 2, the input end of which is connected to the output end of the multi-wavelength laser 1, the switching time of the wavelength switching unit 2 is less than 10 ns, according to the output wavelength interval of the multi-wavelength laser 1, an optical switch program is written to make multiple optical carriers Separation is realize...
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Abstract
An optical switch-based beam-scanning optically-controlled phased array radar comprises: a multi-wavelength laser; a wavelength switching unit, an input end of which is connected with an output end of the multi-wavelength laser; an optical amplifier, an input end of which is connected with an output end of the wavelength switching unit; an optical fiber, one end of which is connected with an output end of the optical amplifier; a modulator having an input end connected to the other end of the optical fiber and modulating a radar signal; a beam splitter, an input end of which is connected to an output end of the modulator; a single mode optical fiber array, one end of which is connected with an output end of the beam splitter; a dispersion optical fiber array, each end of which is connected to one end of the corresponding single mode optical fiber array; an amplitude controller array, an input end of each amplitude controller array being connected with the corresponding dispersion optical fiber array; a phase shifter array, each input end of which is connected with each output end of the amplitude controller array; and a photodetector, each input end of which is connected to each output end of the phase shifter array.
Description
technical field [0001] The invention belongs to the technical field of microwave photonics, in particular to a beam scanning optically controlled phased array radar based on an optical switch, which can realize rapid wavelength switching. Background technique [0002] The beam forming angle of the optically controlled phased array radar is determined by the wavelength of the light. Therefore, the scanning rate of the angle depends on the speed of wavelength switching. With the development and progress of phased array radar in the military, fast scanning rate has become an increasingly important requirement. [0003] Many optically controlled phased array beamforming schemes have been proposed at home and abroad. However, these schemes have many disadvantages. First, the beam switching time of phased array radar is limited by the wavelength switching time of the laser. Usually, the frequency-sweeping laser is composed of a fast tunable The optical filter is composed of a bro...
Claims
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IPC IPC(8): G01S17/88
CPCG01S17/88
Inventor 朱馨怡李明石暖暖祝宁华
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI