Method for adjusting wave form of Manchester code

A waveform adjustment and positive signal technology, which is applied in the field of Manchester code waveform adjustment, can solve the problems of non-production, complex message format, etc., and achieve the effect of facilitating sampling and decoding and improving decoding reliability

Inactive Publication Date: 2010-08-04
ZHEJIANG UNIV
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Problems solved by technology

However, the dedicated chips of the 1553B protocol processors currently used in China are all purchased from foreign manufacturers. Although there are related researches in China, there is still no technology for producing such dedicated chips. One solution uses FPGA to implement the protocol through an external transformer output. Between the protocol processor and the transformer, a dual-channel transceiver is used to shorten the transition edge time and provide driving current. However, due to its analog characteristics, the dual-channel transceiver produces a waveform that deviates from the midpoint of the zero-crossing transition before decoding. A waveform adjustment method is needed to convert it into a Manchester pattern with a zero-crossing transition at the mid-point of the bit time for subsequent sample decoding
[0003] The message format used by 1553B is relatively complicated, but the basic message composition unit is word, which is composed of 1 synchronization header, 16 data bits and 1 parity bit

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  • Method for adjusting wave form of Manchester code
  • Method for adjusting wave form of Manchester code

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Embodiment Construction

[0014] Reference figure 1 In the figure, the input signal Vin is the Manchester code. The Manchester code passes through the positive signal RXP and the negative signal RXN generated by the dual-channel transceiver. The output waveform of the dual-channel transceiver can be seen. Although the transition edge time is shortened, the output waveform has been distorted. , The code pattern is not equal when converted to high and low bits. In the figure, tDR represents the delay time from the input zero crossing point to the rising edge of the positive signal RXP and negative signal RXN after conversion. tRG represents the Manchester code generated by the dual-channel transceiver The time between the positive signal pulse and the negative signal pulse.

[0015] See the waveform timing of waveform adjustment figure 2 , The specific process of waveform adjustment is: Step ①, respectively sample the positive signal RXP and negative signal RXN generated by the Manchester code through the ...

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Abstract

The invention discloses a method for adjusting the wave form of a Manchester code. The method comprises the following steps: respectively sampling a positive signal and a negative signal which are generated by the Manchester code through a two-channel transceiver; setting a positive synchronous signal and a negative synchronous signal which respectively lag behind the positive signal and the negative signal; detecting the hopping edges of the positive signal and the negative signal so as to generate a monitoring signal for monitoring whether information is over or not; and carrying out wave form adjustment according to the hopping edge of a corresponding signal detected by the monitoring signal. The method for adjusting the wave form of the Manchester code can convert the wave form of zero passage hop deviating the bit time middle point generated by the two-channel transceiver into the Manchester code form of the zero passage hop at the bit time middle point, thereby facilitating follow-up sampling and decoding, and improving the reliability of decoding.

Description

Technical field [0001] The invention relates to a waveform adjustment method, in particular to a Manchester code waveform adjustment method. Background technique [0002] In recent years, the continuous development of science and technology has led to the continuous development and improvement of avionics integrated systems. As a high-reliability and real-time communication bus, 1553B is widely used in electronic networking systems in aviation, aerospace, military and other fields. The key part of the 1553B bus system is the protocol interface processor. However, the 1553B protocol processor dedicated chips currently used in China are purchased from foreign manufacturers. Although there are related researches in China, there is still no technology to produce such dedicated chips. One solution uses FPGA to realize the protocol output through an external transformer. Between the protocol processor and the transformer, a dual-channel transceiver is used to shorten the transition ed...

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Application Information

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IPC IPC(8): H03M5/12H04L1/00
Inventor张登伟律新伟舒晓武刘承
OwnerZHEJIANG UNIV