The KS-1 missile was developed for the PLA as a replacement for the HQ-2, itself a reverse-engineered copy of the Soviet S-75 Dvina and used the same command guidance and SJ-202 Fan Song engagement radar along with what appears to be a HQ-2 single-rail launcher adapted to twin rails for the more compact KS-1 missile. This launcher could be mounted on a 6x6 truck to increase system mobility or be emplaced in the standard fashion.
KS-1A is the updated version, roughly the Chinese equivalent of the American MIM-23 HAWK, except it was designed to engage missiles as well as aircraft. This unique design feature means that it is the first Chinese SAM to adopt an indigenous planar passive phased array engagement radar, designated the H-200, which can simultaneously track multiple targets 100+ km away, it can guide six missiles to three targets at the same time (two missiles at each target). The new radars substantially improve the systems performance over the original KS-1.
The first successful test-firing of the missile was in 1989; KS-1 development was complete in 1994. The missile was first publicized in 1998 at the Zhuhai airshow. An improved version, the KS-1A, which greatly enhanced its minimum altitude and range, has already been developed and first appeared at the sixth Zhuhai airshow in 2006. It was rumored that this improvement also increased its ability to engage targets maneuvering at a higher g force.
The People's Liberation Army (PLA) preferred to wait for the improved model, the KS-1A, which has better performance, thus the KS-1 was only delivered to the Chinese armed forces in very small numbers for evaluation purposes. However, due to more advanced SAM systems being available, such as the HQ-16 and the HQ-17, it is unlikely that the PLA would ever purchase the KS-1A, the fate of both missiles is uncertain.
Both the KS-1 and the KS-1A are offered for export.
Components of the KS-1A system such as the modern planar array engagement radars could be used for upgrading legacy HQ-2 and S-75 systems, dramatically improving their performance.
Standard deployment of a KS-1A SAM battery typically includes:
- 1 Planar Passive phased array radar (PPAR)
- 4 launchers, each with 2 missiles
- 24 missiles
- Other support equipment
- KS-1: The initial version with a SJ-202 enagement radar, which adopts a simple horn instead of a lens arrangement, the missile seeker has a traditional parabolic antenna, and can guide up to two missiles against one target. The KS-1 resembles the US SM-1 or SM-2 Standard.
- KS-1A: A KS-1 development, with a Cassegrain antenna for the seeker, and the option of the towed H-200 planar array PPAR or mobile SJ-231 planar array PPAR, which can guide up to eight missiles against four targets (two missiles for each target) simultaneously. The SJ-231 radar adopts a more complex lens arrangement like that of the MPQ-53 radar of the MIM-104 Patriot. The delay in the development caused the earlier production KS-1A units to be deployed with the earlier H-200 radar used by the KS-1. The KS-1 has been upgraded by more advanced subsystems of its successor the KS-2, such as the radar of latter.
- KS-2: The latest and last of the KS series, did not enter mass production due to the availability of a more advanced SAM, but its subsystems are used to upgrade earlier models. The missile seeker has a planar slotted-array antenna, the radar is HT-233 PPAR used by the HQ-9.
- HQ-12: A derivative of the KS series that utilizes the SJ-202/212 radar. The original SJ-202 is the radar used by the HQ-2 series SAM and its successor; the SJ-212 is a fully solid-state version which is also completely digitized, although both radars look very similar externally. In comparison to the KS-1/1A, the fire control radar of the HQ-12 allows the SAM to have the option of engaging either three targets with a pair of missiles for each target, or alternatively, engaging six targets with a single missile for each.
- KS-1000: At the 9th Zhuhai Airshow held in November 2012, an additional member of KS series was revealed to public, designated as KS-1000, which is essentially a KS-2/HQ-12 with an additional booster added, thus at least double the range. According to the developer at the airshow, KS-1000 also has improved maneuverability in comparison to older versions.
- FK-1000: 9M311 missiles were first exported to China in 2005, and at the 9th Zhuhai Airshow held in November 2012, a suspected Chinese derivative of 9K22 Tunguska designated as FK-1000 was revealed to public. The China Aerospace Science and Technology Corporation (CASIC) developed FK-1000, differs from 9K22 Tunguska in that FK-1000 is mounted on an 8 x 8 truck, and the 30 mm guns of Tunguska are replaced by 25 mm autocannons. The radars of FK-1000 are arranged in the exactly the same way as in 9K22 Tunguska, but mechanically scanned surveillance and tracking radars of Tunguska are both replaced by a phased array radars in FK-1000. A total of 12 missiles are mounted on the sides of weapons station, with 6 on each side, in the form of 2 rows of 3 containers/launchers each. The missile of FK-1000 is also surprisingly similar to 9M311, and this has led many in the west to claim that FK-1000 system is derived from 9K22 Tunguska, but with cheaper price tag than the latest Russian system: in comparison to the 15 million dollars of Pantsir-S1 (SA-22), FK-1000 system is priced at 5 million dollars.
- KS-1C: New variant
- Weight: 900 kg
- Warhead: > 100 kg
- Length: 5.6 m
- Diameter: 0.4 m
- Speed: 1,200 m/s
- Maneuverability: > 20 g
- Maximum target speed: 750 m/s
- Maximum target maneuverability: > 5 g
- Maximum range: > 50 km
- Minimum range: 100 m
- Maximum altitude: > 25 km 
- Minimum altitude: < 500 m
- "SJ-231 for KS-1A"
- "HT-233 radar for HQ-9"
- "SJ-202/212 radar for HQ-12 (in Chinese)"
- 9M311 sold to China in 1005
- FK-1000 SAM
- China offered a combination of cheap flak[dead link]
- China does it cheaper again
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