Method and device for measuring zero-crossing offset of navigation signal phase detection curve

Abstract

The invention discloses a method for measuring the zero-crossing point offset of a navigation signal phase detection curve, which includes the following steps: acquiring navigation signal data; calculating the zero-crossing point offset of an acquisition signal phase detection curve; calculating the zero-crossing point offset of a reference signal phase detection curve; calculating the differencebetween the zero-crossing point offset of the acquisition signal phase detection curve and the zero-crossing point offset of the reference signal phase detection curve under the same correlator interval to obtain the zero-crossing point offset of a navigation signal phase detection curve. By deducting the zero-crossing offset of the reference signal phase detection curve, the influence of pseudo codes and data between components on offset calculation is reduced, the obtained zero-crossing point offsets of phase detection curves of acquisition signals in different time periods are highly consistent, and the measurement accuracy is high. The method is suitable for calculating and analyzing the zero-crossing point offset of a phase detection curve caused by navigation load distortion. An effective means is provided for the optimized design, delivery, test and fast assessment of navigation load.

Description

technical field [0001] The invention relates to the field of navigation signal measurement, in particular to a method and equipment for measuring the zero-crossing point offset of a phase detection curve of a navigation signal. Background technique [0002] At present, there are two main methods for measuring the zero-crossing point offset of the phase detection curve of the navigation signal: [0003] The first is to make measurements with a navigation monitoring receiver, which requires the monitoring receiver to be capable of measuring at multiple fixed correlator intervals. The influence of modulation data, authorization code and other factors can be eliminated by monitoring receiver measurement. However, due to the limitation of hardware implementation conditions, the correlator interval is relatively large and cannot be set arbitrarily, which makes the monitoring receiver not sensitive enough to the subtle features of the signal. For the BOC modulation signal widely s...

AI Technical Summary

Problems solved by technology

At present, Beidou, GPS, and Galileo navigation systems all broadcast multiple navigation signals on one frequency point. There are intermodulation signals in the process of synthesizing multiple navigation signals, and there are aperiodic authorization codes and aperiodic authorization codes in the pseudo codes of the synthesized signals. Data modulation, when using this synthetic signal for analysis, the analysis results are easily affected by intermodulation components, authorization codes and data modulation, resulting in large fluctuations or even opposite results

In the process of signal acquisition by the oscilloscope, although the sampling rate of the oscilloscope is high, the storage depth of the oscilloscope is small, and it is difficult to track and demodulate the data acquisition. There is an aperiodic authorization part in the received signal component, and the S curve corresponding to the authorization code signal component cannot be analyzed. Zero crossing offset

At the same time, in the offline analysis method of collecting data, it is necessary to first generate the phase detection curve according to the correlation function, and then search for the zero-crossing point offset of the phase detection curve. The algorithm is relatively complicated and the calculation time is long

Images