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A receiver of helicopter multi-user satellite communication system

A technology of satellite communication system and helicopter, which is applied in the field of satellite communication, can solve the problems of receiving mutual interference, difficult to eliminate, and reduce the communication rate of the helicopter satellite communication system, so as to improve the system capacity and reduce the effect of multiple access interference

Active Publication Date: 2018-04-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the signal deletion method does not deliberately consider the influence of the rotor, but enhances the anti-deletion capability by reducing the code rate (thereby reducing the impact on the signal caused by the occlusion of the wing), and uses the decoding method at the uplink receiving end However, the defect of this method is that the communication rate of the helicopter satellite communication system is reduced at the same time; the gap avoidance method detects the operation of the rotor or feeds back the internal information of the helicopter, and then predicts the time period that is not blocked by the rotor. Finally, the communication signal is sent in the gap without rotor cover, and the communication signal is not sent during the time period of rotor cover, which can effectively save the transmission power and improve the transmission efficiency
However, in multi-user uplink communication, the information of multiple users will have different gap communication time due to different rotor speeds, and they will interfere with each other when receiving and it is difficult to eliminate

Method used

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  • A receiver of helicopter multi-user satellite communication system
  • A receiver of helicopter multi-user satellite communication system
  • A receiver of helicopter multi-user satellite communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] As shown in FIG. 2 , it is the transmitter of the helicopter satellite communication related to the embodiment of the present invention. The transmitter is located on the helicopter, and the helicopter transmits communication signals to the satellite through the above transmitter.

[0056] In Fig. 2, 11 is the coder that uses channel coding to carry out coding operation to the sent information; 12 is the user information bit after coding is interleaved, then carries out modulation operation, obtains the interleaving modulation module of the information symbol sequence after modulation; 13 For the shielding of the satellite signal received by the helicopter according to the helicopter rotor, the gap prediction function block (prediction module, wherein the purpose of this patent application It is to avoid the occlusion of the signal sent by the helicopter to the satellite, and the prediction module predicts by detecting the occlusion of the signal sent by the satellite to...

Embodiment 2

[0061] The transmitter of this embodiment is located on the helicopter, and the receiver is located on the satellite. In order to overcome the interference problem caused by simultaneous communication between multiple users and satellites at present, this embodiment also improves the existing receiver on the satellite.

[0062] The structure of the above-mentioned improved receiver located on the satellite is as follows: image 3 shown.

[0063] image 3 Among them, 21 is to use the pilot frequency of each user to perform sliding correlation operation, and then determine the received information segment and arrival time of each user according to the peak value of the correlation peak, and obtain the random Synchronization and channel estimation device of phase and amplitude information; 25 is to calculate the estimated value of the symbol of each user's estimated result of the encoded codeword at time t (the estimated value is the mean value and variance), and then according...

Embodiment 3

[0077] The present invention proposes a multi-user satellite communication system based on helicopter rotor occlusion avoidance. A helicopter satellite communication uplink system is set, and three users send information at the same time, and the satellite receiver receives and demodulates the information of the three users at the same time.

[0078] For each user's transmitter, there is an encoder 11, an interleaved modulation module 12, a prediction module 13 and a grouping module 14, wherein:

[0079] The encoding module 11 uses channel coding to encode the transmitted information, and then transmits the encoded user information to the interleaving modulation module 12 .

[0080] The interleaving modulation module 12 interleaves the received coded user information according to the set interleaving length L, and then performs a modulation operation to obtain a modulated information symbol sequence, which is sent to the grouping module.

[0081] The prediction module 13 predi...

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Abstract

The invention relates to a transmitter and receiver of a helicopter multi-user satellite communication system, and belongs to the technical field of satellite communication. The transmitter and the receiver are mainly applied to an uplink of the helicopter multi-user satellite communication system and are used for carrying out high-efficiency transmission and synchronous reception of multi-user information under an intermittent channel shielded by a helicopter rotor. According to the transmitter, the number of transmittable symbols in each communication period is determined according to the duration of a communication available period obtained by a gap prediction module; to-be-transmitted data is grouped according to the corresponding number; pilots are added; and then signals which are sent segment by segment are formed. According to the receiver, arrival time of each user information segment is obtained by carrying out correlation on the pilots; a user mutual interference state is determined; the feature of the multi-address interference borne by each user is estimated through use of an interference reconstruction module; the multi-address interference eliminated, thereby obtaining estimation of each symbol sent by the user; estimation values are sent to the interference reconstruction module, thereby forming iteration detection; and detection results are output after certain iteration times.

Description

technical field [0001] The present invention relates to a multi-user satellite communication system based on helicopter rotor occlusion avoidance, the multi-user satellite communication system belongs to the technical field of satellite communication, in particular a transmitter and receiver of a helicopter multi-user satellite communication system. Background technique [0002] Helicopter communication needs to rely on the helicopter satellite communication system, but due to the limited installation position of the transmitting antenna on the helicopter, for example, many satellite communication antennas can only be installed under the rotor of the helicopter, such installation position will lead to the transmission between the helicopter and the satellite communication system The signal was blocked by the obstruction of the helicopter rotor. Therefore, in helicopter satellite communication, the influence caused by rotor occlusion needs to be considered. [0003] In order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04B1/10H04B7/185H04L1/00H04L25/03
CPCH04B1/0483H04B1/10H04B7/1851H04L1/0071H04L25/03305
Inventor 倪祖耀任印鹏匡麟玲吴胜陆建华
Owner TSINGHUA UNIV
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