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Communication method for guiding landing assisting of helicopter based on grading fountain codes

A communication method and helicopter technology, applied in the field of electronic information, can solve the problem of low communication reliability, achieve the effect of improving the success rate of decoding and reducing the bit error rate

Active Publication Date: 2015-07-29
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a communication method based on hierarchical fountain codes to guide helicopters to assist in landing, which solves the problem of low communication reliability when existing helicopters assist in landing in unstable channel environments

Method used

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  • Communication method for guiding landing assisting of helicopter based on grading fountain codes
  • Communication method for guiding landing assisting of helicopter based on grading fountain codes
  • Communication method for guiding landing assisting of helicopter based on grading fountain codes

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Embodiment Construction

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] According to the distribution of important parameters that determine the encoding and decoding efficiency of fountain codes, the ratio of encoded packets with a degree of 1 to the total encoded packets is adjusted to improve the decoding success rate of LT codes and reduce the number of decoding restarts. Divide the coding level into level 0, level 1 and level 2, and the division basis is as follows:

[0053] For the data frame with data length k=256bit, select the LT code with robust solitary wave distribution, the decoding overhead is 0.2, apply the BP (Belief Propagation) decoding algorithm, and each time the coded packet is generated, the coded packet with a degree of 1 occupies When the ratio is different, the LT code decoding bit error rate BER (Bit Error Rate) and the encoding and decoding time are as follows: figure 1 and fi...

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Abstract

The invention discloses a communication method for guiding landing assisting of a helicopter based on grading fountain codes. The communication method specifically comprises the following steps of 1, after a ground guide person selects a proper landing airport, firstly, fixing four beacons at four corners of a landing mark H, starting the four beacons, and waiting the helicopter; 2, enabling the helicopter to carry a receiving end, and searching an ultraviolet signal which is broadcast and sent by a sending end; 3, enabling a pilot to complete the aligning of the helicopter and the beacons according to the display of the received light intensity indication lamp array; 4, enabling the pilot to finely adjust the gesture of the helicopter in real time according to the information displayed on a liquid crystal screen, so as to complete the safety landing of the helicopter. The communication method has the advantages that by combining the communication strategies for landing assisting of the helicopters with ULC-LT (unequal leveling code - Luby transform) codes in different stages, the decoding success rate of the takeoff and landing assisting communication is improved, the false bit rate is reduced, the reliable communication under the condition of high channel packet loss rate is guaranteed, and the searching, positioning and landing efficiency and safety of the helicopter are improved.

Description

technical field [0001] The invention belongs to the technical field of electronic information, and in particular relates to a communication method for guiding a helicopter to assist landing based on hierarchical fountain codes. Background technique [0002] Existing helicopter landing aid systems generally use visible cursors and semaphores, and more often ground guides communicate with pilots by radio, relying on the pilot's personal skills to land. However, visible light is easily affected by weather factors such as natural light, heavy rain, and heavy smog; the use of radio and semaphore requires ground guides and flag bearers to send on-site information to the pilots in real time, so that the ground guides are "tied" to the temporary landing field and cannot play their role. The greater effect makes the human resources that are already in short supply in emergency situations not fully utilized, reducing the efficiency of disaster relief. Wireless ultraviolet assisted ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D45/04
Inventor 赵太飞刘雪王玉陈伦斌
Owner XIAN UNIV OF TECH
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