Satellite positioning receiver long code signal acquisition test method

Abstract

The invention discloses a satellite positioning receiver long code signal capture test method and system. The method comprises the steps that a navigation signal simulation source sets a scene; the upper computer obtains the approximate position and almanac information and sends the approximate position and almanac information to the receiver; adjusting the adjustable attenuator, and determining a test signal level; the upper computer generates random time offset, sends the random time offset to the time service board and controls the time service board to carry out time service on the receiver; the upper computer sends a capture instruction to the receiver; the receiver carries out capture processing, calculates a time difference and returns the time difference to the upper computer; and the upper computer judges the time difference, judges whether capture succeeds or fails, and calculates the capture time at the same time. According to the invention, the capture module of the receiver can be directly tested, the capture sensitivity, the capture time and the dynamic adaptive capacity are further evaluated, and an effective basis is provided for design development and performance improvement of the satellite positioning receiver.

Description

technical field [0001] The invention relates to the field of satellite positioning and navigation, in particular to a method and system for capturing and testing long code signals of a satellite positioning receiver. Background technique [0002] The signals of the satellite navigation system are divided into short-code signals and long-code signals. The ranging code of the short-code signal generally adopts a periodic pseudo-code, while the ranging code of the long-code signal has no periodicity. The acquisition of the satellite signal is essentially the acquisition of its modulated ranging code, so the acquisition of the long code signal is the acquisition of its non-periodic ranging code. [0003] The acquisition performance of satellite positioning reception mainly includes acquisition sensitivity, acquisition time, and dynamic range. Acquisition sensitivity refers to the ability of the acquisition module to capture the signal level. Signal adaptability. The acquisitio...

AI Technical Summary

Problems solved by technology

The positioning of the receiver involves not only the capture of the signal, but also the observation and the message. The message is divided into two parts: decoding and analysis. Therefore, the method of evaluating the positioning cannot really express the performance of the capture

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