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Compensation for the Difference Between Phase Shifts in the RF Blocks of Goniometric GLONASS Receivers

Keywords:

I.V. Korogodin, A.M. Bykreev


Nonidentity of phase-frequency characteristics of RF blocks of the different antennas causes additional error of relative phase measurements in the goniometric receiver GLONASS. A set of software and hardware to compensate for these errors are designed. It is proposed to include in the goniometric receiver switching devices that produce cyclic switching of radio frequency units by command of the CPU. Steady-state phase differences of signals at the outputs of the ADC in various positions of switches allow you to adjust the second measuring phase differences. Appropriate compensation algorithm is offered. The simulation shows the characteristics of loss in accuracy at 10% relative to the ideal case of identical RF blocks. The proposed set of software and hardware was implemented in goniometric receiver GLONASS. Efficiency is proved. The residual error of the second phase difference is about a quarter of a millimeter.
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