Signal transmission time delay detection method, system and device

A transmission delay and signal transmission technology, applied in the field of low-orbit satellite communication, can solve difficult signal transmission delay detection and other problems
CN113259192AActive Publication Date: 2021-08-13BEIJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
BEIJING UNIV OF POSTS & TELECOMM
Publication Date
2021-08-13

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Abstract

The embodiment of the invention provides a signal transmission time delay detection method, system and device, and relates to the technical field of low-orbit satellite communication, and the method comprises the steps: receiving a leading signal transmitted by a user terminal through a satellite; performing cross-correlation on the preamble signal and the ZC root sequence to obtain a first PDP, and obtaining a first peak position of the ZC sequence of each sub-sequence; carrying out cross-correlation on the preamble signal and the conjugate ZC root sequence to obtain a second PDP, and obtaining a second peak position of the conjugate ZC sequence of each sub-sequence; calculating an average value of the first peak position and the second peak position corresponding to each sub-sequence, and taking the average value as a target peak position corresponding to each sub-sequence; and according to each target peak position, the difference between the target peak positions and the sequence length of the ZC sequence, detecting the transmission delay of the preamble signal. When the scheme provided by the embodiment is used for detecting the signal transmission time delay, the problem that the signal transmission time delay is difficult to detect can be solved.
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Description

technical field

[0001] The invention relates to the technical field of low-orbit satellite communication, in particular to a detection method, system and device for signal transmission time delay. Background technique

[0002] The satellite communication system includes satellites and gateway stations. User terminals can exchange data with gateway stations through satellites. User terminals establish network connections with gateway stations by sending preamble signals to gateway stations. In order to ensure that signals sent by different user terminals from the same cell do not interfere with each other during uplink transmission, the gateway station requires that the signals sent by different user terminals arrive at the gateway station to be basically aligned. However, different user terminals are located in different locations. The transmission delay of the signal sent by the user terminal far from the satellite is greater than the transmission delay of the signal genera...

Claims

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