Morse signal self-adaptive recognition method based on backtracking

A recognition method and backtracking method technology, applied in the field of Morse signal recognition, can solve the problems of dot-dash value change, poor self-adaptive ability, change, etc., to reduce the intermediate process, strong self-adaptive ability, code word recognition rate high effect

Inactive Publication Date: 2013-11-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of manual sending, there are differences in keystrokes affected by physiology or psychology, and the dot and dash values ​​often change, and the longer the time, the greater the difference from the reference point. Not only manual, but also related electronic equipment due to signal Interference also has the problem that the dot-dash value will change
In this way, the method based on the reference point calculation often has poor adaptive ability, which leads to a decrease in the codeword recognition rate.
[0006] Of course, in order to adapt to the change of the reference point, there are also a series of complex methods to find the effective reference point, but these methods often rely on a large amount of data and must wait, so it is not suitable for real-time feedback decoding information. Applications in embedded devices, and for embedded devices, there is often the problem of small memory and unable to cache a large amount of data

Method used

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  • Morse signal self-adaptive recognition method based on backtracking
  • Morse signal self-adaptive recognition method based on backtracking
  • Morse signal self-adaptive recognition method based on backtracking

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Experimental program
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Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the main process of the Morse signal adaptive identification method based on the backtracking method of the present invention is:

[0042]Step 1. Establish a Morse signal receiving buffer: First, a Morse signal receiving buffer must be established in the memory (RAM) to store the received Morse signal. out principle.

[0043] The signal receiving buffer is established to match the speed inconsistency between the signal sending by the signal sending device and the signal decoding by the signal receiving device. The signal receiving buffer is a queue, which conforms to the first-in-first-out principle of the queue. This method establishes a signal buffer pointer in the signal receiving buffer to indicate the signal to be fetched during the execution of the method. The buffer pointer starts counting from 0, that is, 0 points to the first signal of the queue. In this method, fetching the next signal is realized by moving the buffer pointer. ...

Embodiment 2

[0066] In practical application, the signal receiver and the sender agree on a short code, and set the ratio error range between dots and dots, strokes and strokes to be between 0.7 and 1.5, and the ratio error range between strokes and dots to be between 2.2 and 4.5. When the receiving buffer receives the signal string, the square wave quantization value is "201 -112 49 -310 55". Take out m first 1 "201" and assume that the signal is a point, corresponding to the left node (the first node) of the second layer in the short code tree, take the next signal m 2 "49", its ratio is 4.1, beyond the point-to-point ratio error range, the matching fails, backtracking. Assume again that m 1 "201" is a stroke, corresponding to m 1 The right child node (the second node in the second layer in the short code tree), which is related to m 2 The ratio of "49" is 4.1, which is in line with the scale range of dots, m 2 is a point, corresponding to m 1 The left child node of (the third node...

Embodiment 3

[0068] In practical application, the signal receiver and the sender agree on a short code, and set the ratio error range between dots and dots, strokes and strokes to be between 0.7 and 1.5, and the ratio error range between strokes and dots to be between 2.2 and 4.5. When the receiving buffer receives the square wave quantization value of the signal string is "58 -65 175 -210 60". Take out m first 1 "58" and assume that the signal is a point, corresponding to the left node (the first node) of the second layer in the short code tree, take the next signal m 2 "175", its absolute value ratio is 0.33, in line with the dot-dash ratio, m 2 "175" is a stroke, corresponding to m 1 Right child node (2nd node of layer 2). This node already has a stored value of "1", has no child nodes, and the encoded value of the signal string is "1". "58 -65 175 -210" will be removed from the buffer, and the pointer will return to 0, pointing to "60".

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Abstract

The invention relates to Morse signal recognition and belongs to the field of communication technology. The invention provides a Morse signal self-adaptive recognition method based on backtracking to solve the problem that the reference point calculation mode in the prior art is not suitable for embedded equipment. The method comprises a first step of establishing a Morse signal reception buffer; a second step of constructing an encoding tree; a third step of setting operating parameters; a fourth step of by setting mating pointer of the signal reception buffer to 0, pointing to a first signal of the reception buffer, and assuming the signal to be a point; a fifth step of matching in the encoding tree according to encoding rules; and a sixth step of handling each case according to matching results. The Morse signal self-adaptive recognition method based on backtracking is advantageous in that firstly, independent of reference point calculation, the recognition method is based on the encoding rules and therefore has a strong self-adaptive capability and a high code word recognition rate; secondly through combination of signal recognition and decoding, and signal recognition by decoding, an intermediate process is reduced, execution efficiency is improved and response speed is faster; and thirdly, the recognition method is applicable to embedded equipment having a small memory and the execution efficiency is very high.

Description

technical field [0001] The invention relates to the identification of Morse signals and belongs to the technical field of communication. Background technique [0002] The Morse signal is transmitted by a stable and non-modulating, intermittent radio signal. The communication equipment is very simple and can be used in high-noise, low-signal environments. It is still widely used in the field of communication, especially in meteorology, Agriculture, military and other fields still play an important role. [0003] When artificial telegrams are sent, the Morse signal is composed of "dots", "dashes" and various "intervals" based on the length of the keys of adjacent signals. The combination of dots, dashes and interval lengths represents different numbers and symbols. The Morse telegraph signal is sampled and processed by the signal acquisition module to obtain a series of square wave signals, and the square wave signal is quantized to obtain a number corresponding to the key-pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L15/24
Inventor 刘明蔡廷友方娇莉尹业华
Owner KUNMING UNIV OF SCI & TECH
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