摘要
应答器是列控系统中用于地-车信息传输的关键设备。本文从降低传输误码率的角度提出连"0/1"个数评分、报文码逻辑"0"和"1"切换频率、同步偏离解析条件、欠采样条件4个报文优选指标,以实现应答器传输报文的优选。通过构造反向查询的字母表、减少检查字母表条件的字数、优选指标与整形约束条件检查同时进行的方式,进一步实现优选报文的快速编码。随机选取武广客运专线真实应答器用户报文进行测试验证。结果表明:根据优选指标能够实现应答器传输报文的优选,采用所提出的快速编码算法生成优选报文的速度比规范定义编码方法提高了97%左右,优选合法报文的误码率明显低于常规合法报文的误码率,满足报文编码的实时性和可靠性的要求。
The balise is the vital equipment used for wayside-onboard information transmission within the train control system.In this paper,four optimization indexes were put forward for the balise transmission telegram generation process,including the scoring of consecutive ＂1/0＂,switching frequency of logics ＂0＂and ＂1＂,off-synch-parsing conditions and under sampling conditions.The optimized telegram was thus selected,aiming to reduce the transmission bit error rate.Furthermore,the coding process of optimized telegram was speeded up greatly by composing a reverse alphabet lookup table,reducing words to check the alphabet,inspecting the optimization indexes and shaping constraints simultaneously.Finally,the real balise user telegrams of the Wuhan-Guangzhou PDL were used for testing and verification.The results show as follows：The optimization indexes are effective to realize balise transmission telegram optimization;the generation speed of optimized telegram is improved by 97% compared with the regular encoding algorithm;the BER（bit error ratio）of optimized telegram is obviously lower than the BER of regular telegram,thus satisfying the real-time and reliability requirements of telegram encoding.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2015年第2期52-57,共6页
Journal of the China Railway Society
基金
铁道部科技研究开发计划(2012X004-C)
