Configurable long code capturing method and device and receiver

Abstract

The invention discloses a configurable long code capturing method and device and a receiver. The method comprises the following steps of: configuring a long code phase reference channel and initializing the long code phase reference channel; setting the initial time of the long code phase reference channel according to a satellite captured by the system for the first time, and maintaining the longcode phase reference channel by using a system clock; sending a pulse signal to the long code phase reference channel maintained by the system clock or an original tracking channel of a to-be-captured satellite according to the capture mode of the to-be-captured satellite, and latching the arrival time of the pulse signal; determining an adjustment value corresponding to the to-be-captured satellite based on a parameter adjustment table so as to adjust the arrival time to a satellite signal emission time ahead of the to-be-captured satellite according to the adjustment value, and taking the adjusted arrival time as a long code initial phase of the to-be-captured satellite; and starting capture according to the long code initial phase and capture parameters. The communication delay is reduced, and the initial phase setting precision is improved. In practical application, the first positioning time and the loss-of-lock recapture time of a long code system can be effectively shortened.

Description

technical field [0001] The invention belongs to the technical field of positioning, navigation and control, and more specifically relates to a configurable long code acquisition method, device and receiver. Background technique [0002] In the field of satellite navigation, there are many research results on CA code acquisition. One of the important reasons is that the CA code has a short cycle and a clear initial phase, and can calculate the correlation value of one or even several cycles at a time. However, the long code has a long cycle, and it is very difficult to directly capture it. It requires huge computing resources, and it is almost impossible to realize the project. [0003] An important parameter in long code acquisition is time uncertainty (usually set to ±1s), this parameter is aimed at the system of time maintenance hardware function, when long code acquisition, set the initial phase of long code according to the system maintenance time, and in Capture within...

AI Technical Summary

Problems solved by technology

[0004] In the traditional long code acquisition process, there are reasons such as unscientific acquisition of the local time of the receiver, unreasonable setting of the initial time of long code acquisition (that is, the initial phase of the long code) and no time maintenance circuit, etc., resulting in long code acquisition time or Catch problems with poor success rate

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