Methods for determining the angular orientation of objects using interferometric measurements of different-frequency signals reflected by corner reflectors of satellite systems are considered. Determining the angular orientation of objects is one of the most common ways to expand the functionality of the consumer equipment of satellite radio navigation systems. The proposed method provides the determination of the angular orientation of a distant object based on the results of the analysis of the frequency spectrum of the reflected signal. The method is implemented using corner reflectors consisting of mutually orthogonal plane-parallel plates of different optical thicknesses. Each face (plane-parallel plate) of the corner reflector forms a unique frequency spectrum of the reflected signal. The desired value of the angular orientation is determined based on the analysis of the frequency spectrum of the recorded reflected signal and the criterion of maximum similarity of the spectrum of a certain orientation of the corner reflector faces. With normal incidence of the probing beam on a plane-parallel plate of a corner reflector, only one frequency is present in the spectrum of the recorded signal. The appearance of only one frequency, determined by the optical thickness of the reflecting plate, serves as a criterion for the orthogonal orientation of the corner reflector and the distant object, respectively.
The paper proposes a method of radio frequency conversion of optical spectrum using an electro-optical modulator of moving mirror Fourier spectrometer, which allows to obtain high resolution with small movement of moving mirror Fourier spectrometer. The results of experimental measurements are presented.
It is theoretically proved the possibility of spectral selection of optical signal using the Michelson interferometer, one of the mirrors of which moves, providing the time variation of the path difference of one of beams of the interferometer according to a sawtooth law. It is shown that even a small displacement of the movable mirror (on the order a wavelength), at a predetermined controlled speed, due to the selective amplification of the received total power of the signal allows to detect the spectral density of optical radiation of a specified wavelength and to expand spectral range of the measurements, consistently changing, while maintaining the linearity of the offset mirrors, the speed of its movement. The limit value of the resolving power of the spectrometer is calculated, which in the optical range is 103 - 104 Hz, and is associated with the value of the time constant of the amplifier.
It is theoretically proved the possibility of spectral selection of optical signal using the Michelson interferometer, one of the mirrors of which moves, providing the time variation of the path difference of one of beams of the interferometer according to a sawtooth law. It is shown that even a small displacement of the movable mirror (on the order a wavelength), at a predetermined controlled speed, due to the selective amplification of the received total power of the signal allows to detect the spectral density of optical radiation of a specified wavelength and to expand spectral range of the measurements, consistently changing, while maintaining the linearity of the offset mirrors, the speed of its movement. The limit value of the resolving power of the spectrometer is calculated, which in the optical range is 103 - 104 Hz, and is associated with the value of the time constant of the amplifier.
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