Method and device of uplink access of satellite communication
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An access method and satellite communication technology, applied in the field of satellite communication uplink access, can solve the problems of affecting link accuracy, reducing communication efficiency, processing delay and increasing channel estimation error, etc., so as to improve communication efficiency and link autonomy. The effect of adaptive accuracy
Inactive Publication Date: 2015-11-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, in satellite communications, especially in low-orbit satellite communications, the application of the stop-equation protocol has a major disadvantage. Due to the time-varying nature of channel quality, each handshake signal needs to be recaptured, which not only reduces communication efficiency, but also brings The processing delay will also increase the error of channel estimation and affect the accuracy of link adaptation
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Embodiment 1
[0038] This embodiment describes the process of a small ground station T accessing and uploading data to a satellite S in bursts in a code division multiple access satellite communication system.
[0039] like figure 1 As shown, it is a schematic diagram of the four-way handshake process between the small station and the satellite, and the specific process is as follows:
[0040] 1. When the small station T has data to upload to the satellite S, it enters the uplink access request stage.
[0041] At this time, the small station T uses a specific spreading code, radio frequency point, symbol rate, transmission power, coding rate and coding method (the "specific" here refers to the satellite T, that is, the ground small station belonging to the communication system When the station sends an uplink access request to satellite T, it needs to use the same spreading code, radio frequency point, symbol rate, transmission power, coding rate and coding method), and sends an uplink req...
Embodiment 2
[0061] A satellite upload access device, such as Figure 6 As shown, it includes the upload request module located in the small station and the upload receive module located in the satellite, and the two communicate interactively with full-duplex radio waves;
[0062] The upload request module located in the small station includes a detection unit and a sending unit working in parallel, and the detection unit has a control function for the sending unit; the sending unit is used to continuously generate and send uplink access request frames, waiting frames and data frames , and the detection unit controls when to switch from the waiting frame to the data frame; the detection unit is used to detect the response frame and the receipt frame issued by the satellite, and when the response frame is detected, the sending unit is controlled to switch from the waiting frame to the data frame , when the data frame is detected, it is confirmed that the upload access is successfully comple...
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Abstract
The present invention relates to a method and device of uplink access of satellite communication, belonging to the field of technology of satellite communication. The method comprises: a request frame is sent by a way station; then waiting frames are continuously sent by the way station; the request frame is captured by a satellite, and spectrum sensing and multi-user identification are completed according to received signals; communication parameters are distributed to the way station according to the identification result, and are sent down through a response frame; at the same time, waiting frame signals are continuously received by the satellite, and sync bits of the frames are subjected to track, despreading and detection all the time; the response frame is detected by the way station and the content of the response frame is extracted so as to obtain parameters sent by the satellite; the sync bits of the frames are sent by the way station, and data frames are sent by the way station according to the parameters distributed by the satellite; when the sync bits of the frames are detected by the satellite, the data frames of the way station is received, tracked and despreaded according to the distributed parameters, contents of the data frames are extracted, and end marks are continuously detected; when end marks are detected, a receipt frame is distributed to the way station; and the process is finished after the receipt frame distributed by the satellite is received by the way station. Compared with the communication efficiency and link self-adaption accuracy of the prior art, communication efficiency and link self-adaption accuracy are effectively improved.
Description
technical field [0001] The invention relates to a satellite communication uplink access method, in particular to a burst uplink access method applied to a satellite by a ground terminal in a code division multiple access satellite communication system, and belongs to the technical field of satellite communication. Background technique [0002] The CDMA method has the advantages of strong anti-interference ability, good confidentiality, flexible and convenient multi-access connection, and is widely used in some satellite communication systems with small capacity, wide distribution and composed of multiple small stations. The process of transmitting data from the ground station to the satellite is called uplink. Due to the long transmission distance and large propagation delay of the satellite channel, the ground station is a small user terminal limited by power consumption and antenna aperture. The power of the transmitted signal cannot be very large, so most earth observatio...
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