Method and system for measuring group delay of high-precision GNSS receiver of carrier phase

A technology of carrier phase and measurement method, applied in the field of satellite navigation

CN113253310AActive Publication Date: 2021-08-13NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-08-13

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Abstract

The invention discloses a carrier phase high-precision GNSS receiver group delay measurement method and system; the method comprises the steps: enabling a narrowband spread spectrum signal to pass through a to-be-measured group delay characteristic channel, and obtaining a code phase measurement value and a carrier phase measurement value after the narrowband spread spectrum signal is captured and tracked; then, approximating the group delay into a parabolic function by utilizing the characteristic that the group delay in a narrow-band signal passband changes gently, and traversing parabolic parameters and integer ambiguity; and finally, when the difference value between the group delay characteristic obtained by traversing the parabola parameter and the group delay characteristic obtained by traversing the combination of the integer ambiguity and the measured carrier phase is minimum, determining that the group delay characteristic corresponding to the parabola parameter is the actual group delay characteristic of the channel; meanwhile, the group delay measurement of any frequency resolution can be realized by changing the frequency range of the frequency division multiple access signal.
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Description

technical field

[0001] The invention relates to the technical field of satellite navigation, in particular to a carrier phase high-precision GNSS receiver group delay measurement method and system. Background technique

[0002] The GNSS receiver plays an important role in the GNSS system, and the characteristics of the receiver directly affect the quality of the received signal and the positioning result. Among them, the group delay characteristic has a great influence on the signal delay, and the accurate measurement of the group delay characteristic of the navigation channel plays an important role for the high-precision analog navigation channel. If the measurement accuracy of the traditional group delay measured by a vector network analyzer is increased, the resolution of the group delay measurement will be reduced, and there is a contradiction between measurement accuracy and resolution. Contents of the invention

[0003] The present invention aims to solve at least ...

Examples

Embodiment Construction

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0035] refer to figure 1 , a high-precision GNSS receiver group delay measurement method of carrier phase, the specific steps are as follows:

[0036] Assume that the given group delay measurement resolution is 0.1 MHz. First, a narrowband spread spectrum signal is generated, and the bandwidth of the narrowband signal is 0.5MHz. In order to ensure the consistency of signal generation time, we adopt the signal mode of frequency division multiple access, so the number of generated signal groups is 5 groups. The mth group of frequency d...