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A method for identifying pulse modulation codes

An identification method and pulse modulation technology, applied in modulation type identification, modulated carrier system, digital transmission system, etc., can solve the problem of incomplete public information, and achieve the goal of simple identification method, easy operation, and wide application prospects Effect

Inactive Publication Date: 2020-03-20
中国人民解放军63889部队 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Judging from the public literature, there are relatively few research results on code recognition and analysis technology, and the public information is not comprehensive. Therefore, the technology in this field urgently needs the attention and research of scholars.

Method used

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  • A method for identifying pulse modulation codes
  • A method for identifying pulse modulation codes
  • A method for identifying pulse modulation codes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Assuming that the first pulse arrival time of the acquisition record is time 0, its pulse time-of-arrival (TOA) sequence is shown in the PCM coded signal pulse timing table in Table 5:

[0098] table 5

[0099] Pulse sequence number 1 2 3 4 TOA(ms) 0 150 200 300 Pulse sequence number 5 6 7 8 TOA(ms) 350 500 550 650

[0100] According to the above pulse timing table, the corresponding pulse intervals can be obtained as follows: 150ms, 50ms, 100ms, 50ms, 150ms, 50ms, 100ms. It can be seen that the encoding period is 350ms, and one encoding period contains 4 pulses, and the pulse interval △T i They are: 150ms, 50ms, 100ms, 50ms, among which the smallest pulse interval △T min is 50ms, the identification process of the coded signal is as follows:

[0101] Calculate the codeword identification value corresponding to the pulse interval, and determine the basic codeword unit: the minimum pulse interval ΔT min and the correspondin...

Embodiment 2

[0111] Assuming that the first pulse arrival time of the acquisition record is time 0, its pulse time-of-arrival (TOA) sequence is shown in the PCM coded signal pulse timing table in Table 6:

[0112] Table 6

[0113] Pulse sequence number 1 2 3 4 TOA(ms) 0 300 700 1000 Pulse sequence number 5 6 7 8 TOA(ms) 1400 1700 2100 2400

[0114] According to the above pulse timing table, the corresponding pulse intervals are: 300ms, 400ms, 300ms, 400ms, 300ms, 400ms, 300ms. The repetitive pulse interval of the coded signal includes 300ms and 400ms arranged in sequence, so the coded period can be known 700ms, one encoding cycle contains 2 pulses, the pulse interval △T i Respectively: 300ms, 400ms, the smallest pulse interval △T min is 300ms, the identification process of the coded signal is as follows:

[0115] Calculate the codeword identification value corresponding to the pulse interval, and determine the basic codeword unit: the minimum...

Embodiment 3

[0123] Assuming that the first pulse arrival time of the acquisition record is time 0, its pulse time-of-arrival (TOA) sequence is shown in the PCM coded signal pulse timing table in Table 7:

[0124] Table 7

[0125] Pulse sequence number 1 2 3 4 TOA(ms) 0 300 800 1100 Pulse sequence number 5 6 7 8 TOA(ms) 1600 1900 2400 2700

[0126] According to the above pulse timing table, the corresponding pulse intervals can be obtained as follows: 300ms, 500ms, 300ms, 500ms, 300ms, 500ms, 300ms. The repetitive pulse interval of the coded signal includes 300ms and 500ms arranged in sequence, so the coded period can be known 800ms, one encoding cycle contains 2 pulses, the pulse interval △T i Respectively: 300ms, 500ms, the smallest pulse interval △T min is 300ms, the identification process of the coded signal is as follows:

[0127] Calculate the codeword identification value corresponding to the pulse interval, and determine the basic cod...

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Abstract

The invention discloses a pulse modulation code identification method. The method comprises the following steps: determining the coding cycle and all pulse intervals in one coding cycle according to the pulse sequence information of an acquired PCM coding signal, calculating the code word identification values corresponding to all the pulse intervals according to the minimum pulse interval in the coding cycle and the corresponding pulse intervals, and determining a basic code word unit; determining the code words corresponding to the code word identification values of the pulse intervals according to the identification corresponding relationship between code word identification values and code words; and arranging the code words corresponding to all the pulse intervals in the coding cycle in order to get an identified PCM coding signal. According to the pulse modulation code identification method of the invention, the coding cycle of a signal can be obtained and a PCM coding signal can be identified as long as the pulse sequence information of the PCM coding signal is known. The identification method is simple and easy to operate, needs less information, can be used to identify a coding signal quickly and accurately, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of pulse modulation codes, and in particular relates to a pulse modulation code identification method. Background technique [0002] Pulse Code Modulation (PCM) is a coding method that samples, quantizes and codes continuously changing analog signals, and converts analog voice signals into digital signals. The encoding process encodes the sampled and quantized signal into a binary code group output, and this binary code group is the pulse modulation code. [0003] The pulse modulation code has the characteristics of simple coding, difficult identification, strong anti-interference ability, etc., and is widely used in signal coding. In the field of communication countermeasures, due to the comprehensive digitalization of modern communication and the widespread use of coding technology, it seems more and more difficult to identify signals through traditional manual monitoring methods. In order to obtain more effective ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B14/02H04B14/04H04L27/00
CPCH04B14/026H04B14/04H04L27/0012
Inventor 王金峰樊彩霞楚振锋王德飞孟智勇胡维星张海庄
Owner 中国人民解放军63889部队