A digital non-integer tracking loop for satellite positioning and navigation receiving system

A technology of receiving system and tracking loop, which is applied in the field of tracking loop, can solve the problems of using high sampling rate, etc., and achieve the effect of fine time resolution
CN103983989BActive Publication Date: 2016-05-18δ»˜ε―…ι£ž
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
δ»˜ε―…ι£ž
Publication Date
2016-05-18

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Abstract

The invention relates to a digital non-integer tracking loop for a satellite positioning and navigation receiving system. According to the scheme, phase offset between a received signal and a local duplication code can be divided into integer offset and decimal offset, fraction type interpolation is carried out on the received medium frequency wireless signal through a filter of a Farrow structure, and then a carrier component in the signal is removed. If one integer offset exists, the local duplication code shifts smoothly according to the integer offset. The correlation operation is carried out between an early duplicate of the local duplication code and the interpolated received signal and between a later duplicate of the local duplication code and the interpolated received signal. By interpolation on the received signal, extremely fine time definition can be achieved, and a low sampling rate is kept.
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Description

technical field

[0001] The invention relates to a satellite positioning and navigation receiver system, in particular to a tracking loop in a GPS system. The present invention also supports other satellite positioning and navigation receiver systems such as Galileo or Beidou, or multi-mode satellite positioning receivers. Background technique

[0002] Satellite positioning navigation systems use multiple satellites to send precise navigation signals that enable a receiver to determine its current position and velocity through triangulation. The receiver estimates the transit time of the signal from the satellite to the receiver, and then calculates the position of the satellites and their distance from the receiver.

[0003] GPS is a full-featured global positioning navigation system developed by the US Department of Defense. Each satellite can simultaneously transmit signals on the frequency points of L1 (1575.72MHz) and L2 (1227.6MHz). The L1 signal carries navigation i...

Claims

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