横滚角:XOZ面与水平面的垂直平面的夹角.http://cache.baidu.com/c?word=%BA%E1%3B%B9%F6%3B%BD%C7%2C%B8%C5%C4%EE&url=http%3A//cae%2Enuaa%2Eedu%2Ecn/dwdh/netclass/kejian/06guandaogaishu%2Epdf&b=0&a=41&user=baidu#0