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Signal synchronization method of satellite-borne GNSS receiver based on orbital dynamics assistance

A signal synchronization and receiver technology, applied in the field of satellite autonomous navigation, can solve problems such as unsuccessful GNSS signal synchronization

Active Publication Date: 2018-12-21
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

However, the proposed method does not use prior information to assist bit synchronization / frame synchronization.
For GNSS signals of general strength, the time overhead of bit synchronization and frame synchronization is tens of seconds. For weak GNSS signals, the time overhead of bit synchronization and frame synchronization can reach several minutes, and may even fail to become a bottleneck for GNSS signal synchronization

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  • Signal synchronization method of satellite-borne GNSS receiver based on orbital dynamics assistance
  • Signal synchronization method of satellite-borne GNSS receiver based on orbital dynamics assistance
  • Signal synchronization method of satellite-borne GNSS receiver based on orbital dynamics assistance

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Embodiment Construction

[0072] The satellite-borne GNSS receiver signal synchronization method based on orbital dynamics assistance proposed by the present invention can carry out signal synchronization real-time assistance to the satellite-borne GNSS receiver, and the specific content of assistance includes:

[0073] 1. Satellite search assistance. Use the auxiliary GNSS visible star list information to set the search range, eliminate invisible satellites, and reduce the time spent on capturing invisible satellites; use the auxiliary receiving power to set the priority of the satellites to be searched, and give priority to satellites with stronger power. Enable the receiver to quickly capture high-quality signals and enhance GNSS availability;

[0074] 2. Signal capture assistance. Use the auxiliary Doppler and delay information to set the Doppler and code phase two-dimensional search range of the received signal to reduce the search area; use the auxiliary received power information to set the pre...

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Abstract

The invention discloses a signal synchronization method of a satellite-borne GNSS receiver based on orbital dynamics assistance. The signal synchronization method comprises the steps that (1) input data preparation for the GNSS receiver is performed; (2) the orbital dynamics recursion of a motion state of the GNSS receivers is performed; (3) an estimated value of the sending time of all signals arriving at the GNSS receiver at time t1 and the position and velocity of a corresponding GNSS satellite in an ECI system are calculated; (4) auxiliary information calculation is performed; and (5) signal synchronization assistance is performed. The signal synchronization method can greatly reduce the time required for GNSS signal synchronization, and then improves the overall navigation performanceof the satellite-borne GNSS receiver, the algorithm is simple and reliable, and the signal synchronization method is suitable for the satellite-borne GNSS receiver.

Description

technical field [0001] The invention relates to a satellite-borne GNSS receiver signal synchronization method based on orbital dynamics assistance, and belongs to the technical field of satellite autonomous navigation. Background technique [0002] Spaceborne GNSS has the advantages of high autonomy, high positioning accuracy, and small volume and power consumption. Different from ground application scenarios, spaceborne GNSS receivers face more challenging signal processing requirements. For low-orbit users and large elliptical orbit users, the Doppler search range of GNSS signals is tens of KHz, which is greater than 8KHz for ground applications; because the receiver flies around the earth at high speed, the visible GNSS satellites in its field of view change rapidly, and a single The average available time of GNSS satellites is much lower than that of ground scenarios; for users with large elliptical orbits, GNSS signals have a larger dynamic range of signal power due to...

Claims

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Application Information

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IPC IPC(8): G01S19/24G01S19/27
CPCG01S19/24G01S19/27
Inventor 张蓬蒙艳松张攀王登峰杨克元王延光
Owner XIAN INSTITUE OF SPACE RADIO TECH
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