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车锁干扰器让车钥匙失灵 锁车后一定要拽拽车门

2016-02-02 16:07:27   中国新闻网

第一组实验的汽车是一辆白色丰田花冠。车主李先生按下锁车键后,车灯闪了一下,并发出提示音。这是表示车门已经锁上的标志。随后,李先生重新将车门打开,记者和李先生站在车前2米处,同时按下干扰设备和车钥匙的按钮,车灯却没有发生闪烁,汽车也没有发出任何声响。李先生试着扳动车门把手,竟然轻而易举地就将车门打开!

随后,记者拿着干扰设备走到距车10米远的地方,李先生则直接站在车门处,再次同时按下按钮。结果,车还是没有任何反应,车门还是没锁上。接下来,记者走到距车30米远的地方,李先生则站在原地不动,第三次同时按下按钮。车门依旧没能锁上。只要记者按着干扰设备,无论长按还是短按,都能成功地干扰锁车。最后,李先生提出先按车钥匙,这才把车门锁上。他无奈地表示,这是原装的车钥匙,却没想到抗干扰性如此差。

第二个参与试验的志愿者驾驶的是一辆现代伊兰特。和前面的丰田车一样,在5米之内,只要记者按下干扰设备的按钮,车钥匙就无法正常锁车。不过,伊兰特的抗干扰性似乎要强于前车,当记者拿着干扰设备走到5米以外的位置,电子钥匙就能够将车门锁住,干扰就失效了。

另两名参与实验的轩逸轿车和别克君威轿车,面对干扰设备,电子钥匙都出现了失灵的情况。但是,记者在实验中也发现,干扰设备对大众Polo车就无可奈何。无论记者离着车门有多近,都无法干扰车钥匙锁车。

原理:利用同频段电磁波进行干扰

国家体育总局航管中心办公室副主任王力军此前在接受记者采访时介绍,其实记者购买的这款廉价干扰设备之所以能使电子车钥匙失灵,主要是利用其发射的同频率或是相近频率的电磁波进行了干扰。“好在这种干扰一般来说只能导致操作无效,而不会进行其他操作,所以车主也不必过于担心。”王力军说,在频率相近的时候,汽车遥控器被其他发射装置干扰,这是很正常的现象。

这种干扰是通过叠加不同发射源的电磁波,导致信号紊乱,从而使接收设备无法辨别出有用的信号,无法听从遥控器指挥。但是,由于干扰并不知道信号的含义,因此发射的信号,也无法对汽车“下达有效命令”。

至于复制电子车钥的信号,王力军说,虽然理论上可以复制,但是无法解密,便无法得知有用信息。即使是加密水平较低的电子车钥,也得有很专业的设备,才能做到读取信号。几十块钱可以买个能复制的遥控器,但恐怕没法使用。其实,对于懂点电子通讯常识的人来说,汽车干扰器的原理,就是通过干扰器发射与车钥匙相同频段的电磁波来进行干扰。“就好比两个人说话,另一个人用特别大的音量在旁边放音乐一样。”

本报记者王琪鹏、李环宇、张硕

责任编辑:柯旺 CN044
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