攀枝花数字地震台网建设的技术难点及其应对措施

Technique difficult points and solving methods in the designing of the seismic digital-network of Panzhihua

攀枝花数字地震台网是一个采用全无线传输方式的地方台网。唯一可资利用的大黑山中继站电磁干扰强烈和部分子台传输路径条件差是该台网设计建设中最大的技术难点。避、滤、纠是在攀枝花台网设计建设中采取的三大应对措施,要点是避开密集而强烈的干扰、在接收机中用多种方法滤除干扰、应用具有高编码增益的前向差错控制技术纠正已出现的误码。通过避、滤、纠使地震波形数据的高质量无线传输在攀枝花特有的恶劣环境中得以实现。

The seismic digital network of Panzhihua City is a local network with the digital signal transmission.But the digital signal transmission is interrupted by the electromagnetism interfere from the relay station of Daheishan and the signals'transmission condition is poor.To solve these problems,three counter-measurements:avoiding interfere frequency,filtering un-want frequency and correcting error codes are adopted.Also the forward error controlling with the high coding gain are used in the network.The results are satisfied.