The PL-2a (AA-2a)  is  a short-range, supersonic solid fuel air-to-air missile utilizing infrared homing and an impact/proximity fusing. It is a Chinese licensed copy of the Soviet R-13 (NATO codename: AA-2 Atoll) short-range air-to-air missile (AAM), which itself was a reverse-engineered clone of the U.S. AIM-9B Sidewinder. 

Source: http://en.wikipedia.org/wiki/PL-2; http://www.sinodefence.com/airforce/weapon/pl2.asp

