Carrier phase cycle slip inhibition method based on phase error amplitude-limiting processing

Abstract

The invention provides a carrier phase cycle slip inhibition method based on phase error amplitude-limiting processing. According to main factors causing carrier phase cycle slip, a carrier wave tracking loop easily produces phase jump when a tracking loop produces dramatical phase jitter or concentrated emergence of the same phase deviations of multiple symbols in a short time. According to the factors causing the phase cycle slip, phase errors output by a phase discriminator can be processed in the carrier wave tracking loop. Large phase jitter and the phase deviations of the same continuous symbols can be avoided by conducting amplitude limiting on instantaneous phase discrimination errors and accumulation values of phase discrimination errors, and accordingly the occurrence probability of the phase cycle slip of the loop is can be reduced. Compared with a traditional carrier wave tracking method, the occurrence probability of the phase cycle slip of the carrier wave tracking loop can be reduced by 67% under the condition that the dynamic conditions of the loop are not considered, and the occurrence probability of the phase cycle slip of the carrier wave tracking loop can be reduced by 38% under the condition that the Doppler frequency of input signals is constant.

Description

technical field [0001] The invention belongs to the technical field of navigation, and in particular relates to a carrier phase cycle-slip suppressing method based on phase error limiting processing, which can be used in satellite navigation signal receivers or other types of spread spectrum receivers. Background technique [0002] In high-precision receivers, carrier phase measurements are often used for positioning. Carrier phase cycle slip is one of the important factors affecting the tracking accuracy of carrier phase measurements. For a general high-precision receiver, the measurement accuracy of the carrier phase can reach the centimeter or even millimeter level. However, one cycle of the carrier phase cycle can cause a deviation of about 20cm in the measured value of the carrier phase. In order to reduce the influence of the carrier phase cycle slip on the carrier phase measurement value, it is necessary to deal with the phase cycle slip in the carrier phase measurem...

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Problems solved by technology

[0003] The influence of cycle slips on carrier phase measurement can be reduced by detecting and repairing cycle slips on carrier phase measurement values, but this method is easily affected by receiver dynamics and satellite and receiver clock errors, and when the number of cycle slips is small or When cycle skips occur frequently, the processing effect is not ideal

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