en.wikipedia.org
SY-400 is a further development of SY-300, that can carry either two short-range ballistic missiles
BP-12A with range of 400 km or twelve 300 mm
PHL-03 rockets. As a low cost alternative to more expensive ballistic missiles, the accuracy of SY400 is increased by adding GPS to correct the cascade inertial navigational guidance, and according to the developer, the accuracy can be further improved if military grade GPS signals are used to replacing the existing civilian GPS signal. Another feature of SY-400 is that it shares the same launching vehicle and fire control system of
BP-12A ballistic missile, thus simplifying logistics.
[33][34]
In 2017,
Qatar received an unknown number of SY-400.
[35] In 2020
Myanmar received undisclosed number of SY-400 system.