原文地址：http://www.sinodefence.com/airforce/specialaircraft/awacs.asp
China
has been developing its own indigenous airborne warning and control
system (AWACS) aircraft since 2000 following the cancellation of the
A-50I/Phalcon AWACS project. The aircraft, based on the Russian Beriev
A-50 (NATO codename: Mainstay) airframe but fitted with a Chinese made
electronically steered phased-array (ESA) radar, may be designated Kong Jing-2000 (KJ-2000). At least one aircraft has been spotted under flight tests near Nanjing, Jiangsu Province.
PROGRAMME
By 1992, China had begun talks with Russia about purchasing the Beriev A-50 (NATO codename: Mainstay) plane, the AWACS variant of the Ilyushin IL-76 military transport aircraft. Later, talks involved acquisition of an Israeli radar system. Three-way negotiations that began in 1994 considered four AEW aircraft for $1 billion.In 1996 China, Russia, and Israel reached initial agreement on a $250 million deal to supply one AEW aircraft to the PLAAF by installing an Israeli Aircraft Industries (IAI) Phalcon phased-array radar with 360 degree coverage on a A-50 plane.
In May 1997, Israel and Russia reached agreement on modifying one IL-76, as a Beriev A-50I, for $250 million, with the option of three more AWACS for a total cost of $1 billion. Russia secured about 20 percent of the deal. After some delay, in October 1999, Russia transferred an A-50 airframe to Israel for the installation of the Phalcon AEW radar system by IAI. By May 2000, Israel had nearly completed work on the aircraft.
The Phalcon deal became an increasingly controversial issue between the United States and Israel. In 2000, the Clinton Administration voiced stronger objections to the sale and urged Israel to cancel the sale of the Phalcon, saying it is a system comparable to the U.S. AWACS and could collect intelligence and guide aircraft from 250 miles away. Finally, in July 2000 the Israeli government cancelled the deal with China.
Following the humiliation of the cancelled A-50I/Phalcon deal, China turned to indigenous solutions. The Phalcon radar and other electronic systems were taken off from the unfinished A-50I, and the airframe was handed to China via Russia in 2002. Modifications on the A-50I airframe began in late 2002 to install the Chinese-made airborne radar system at Xi’an Aircraft Industry Co. (XAC). The aircraft made its first flight in November 2003, and was designated as Kong Jing-2000 (KJ-2000).
Unconfirmed reports claimed that so far two KJ-2000s (one based on A-50I, one converted from a PLAAF/CUA IL-76MD Candid) have been delivered to the PLAAF for operational evaluation and tests. A total of four aircraft may eventually be built, either on new A-50s purchased from Russia, or directly converted locally from the existing IL-76s in service with the PLAAF.
DESIGN
The detailed information regarding the KJ-2000 is unknown. However, it is estimated that the aircraft is comparable to the Russian A-50 in general flight performance. The KJ-2000 is based on the airframe of the A-50, which was developed and manufactured by the Beriev Aircraft Research and Engineering Complex Joint Stock Company based at Taganrog in the Rostov Region of Russia. The A-50’s airframe was developed from the llyushin IL-76MD military transport aircraft manufactured by the Ilyushin Aviation Complex Joint Stock Company based in Moscow. The most distinctive difference on the A-50 airframe is the removal of the 'glass-in' nose of the IL-76MD.
The A-50 carries out patrol missions at an altitude of 5,000m to 10,000m. The patrol service ceiling is 10,000m. The maximum flight range of the aircraft is 5,000km and the flight endurance is 7 hours 40 minutes. At a range of 2,000m, the A-50 can remain on patrol for up to 1 hour 25 minutes. The KJ-2000 also has a fixed in-flight refuelling probe, which could be refuelled by the IL-78 Midas tanker. This will significantly increase the range and flight endurance of the aircraft.
AIRBORNE EARLY WARNING RADAR
The KJ-2000 carries an electronically steered phased-array (ESA) radar in a large round radome. Unlike the Russian A-50 or U.S. E-3C, which rotate their rotodomes to give a 360 degree coverage, the KJ-2000's radar antenna does not rotate. Instead, three ESA antenna modules are placed in a triangular configuration inside the round radome to provide a 360 degree coverage.
The airborne earning warning radar system developed by Nanjing Research Institute of Electronic Technology (also known as 14th Institute), could be similar in capability to the IAI Phalcon, but may not be as capable as the latter. The Phalcon system could track up to 60~100 targets at the same time and guide a dozen fighters in all-weather, day and night operations.
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