RU2011137798A - REFERENCE WORKPLACE FOR ABSOLUTE PRECISION CALIBRATION OF DELAY OF OVER LETTER FREQUENCIES IN THE GLONASS SIGNAL RECEIVER - Google Patents

Abstract

The reference workstation for absolute precision calibration of the delay of the envelopes of the letter frequencies in the GLONASS signal receivers, including a source of test signals, a calibrated receiver and a personal computer for processing calibration results, characterized in that as a source of test signals, a synthesizer of a grid of test frequencies f, phase-modulated by ± 90 ° with the GLONASS pseudo-random sequence code (PSP), ψ phase incursions sequentially measured by the potassium carrier tracking system (CCH) are introduced into the PC of the receiver at the interval Δt, subtract from them the phase incursions υ measured at the same intervals Δt, a hardware copy of the CCH of the calibrated receiver, divide these differences by Δt and obtain the phase-frequency characteristics φ 2πf-1, carry out measurements of the GWD itself according to the formula τ = 1 / 2π (φ-φ) / Δf, summarize these delays and obtain the spectral density of delays, or partial delays τ, partial delays are averaged with the spectrum of the SRP, sequentially shifting the center frequency of the spectrum f, nearest to the j-th stage-by the formula τ = Σp / Σp.

Claims (1)

A reference workstation for absolute precision calibration of the delay of the envelopes of the letter frequencies in GLONASS signal receivers, including a source of test signals, a calibrated receiver and a personal computer for processing calibration results, characterized in that a phase modulated frequency synthesizer f _i , phase modulated, is used as a source of test signals ± 90 ° by the GLONASS pseudo-random sequence code (PSP), phase incursions ψ _i , sequentially measured by the carrier tracking system (CCH), are introduced into the PC of the calibrated receiver on the interval Δt, subtract from them the phase incursions υ _i measured at the same intervals Δt, a hardware copy of the CCH of the calibrated receiver, divide these differences by Δt and obtain the phase-frequency characteristics φ _i for frequencies f _i calculate the delays directly caused by the non-linearity of the phase-frequency characteristic by the formula τ _ni = φ _i / 2πf _i -1, the _{GWD itself is} measured according to the formula τ _gi = 1 / 2π (φ _{i + 1} -φ _i ) / Δf, these delays are summarized and the spectral density of the delays, or partial delays τ _0i , partial delays are averaged with the spectrum of the SRP, sequentially shifting the center battening frequency spectrum to f _i, closest to the j-th stage-by the formula _{τ j = Σp ij τij / Σp} ij.