MIOS-Optical Subsystem:

The MIOS - optical subsystem consists of ~30 low-lux Watec 902H2 ultimate CCD video cameras at two stations Sanya and Ledong separated by about 70 km. Each video camera is coupled with a 7–33 mm f/0.95 Hikvision lens (auto iris used to reduce the possibility of pixel saturation). The video is digitized with the Meteor Video Processing Unit developed by our laboratory with 720×576 pixel resolution (8-bits depth), and stored on disk in AVI format (no compression involved), at a rate of 25 frames per second. In order to improve the sensitivity for observing faint meteors and achieve a large field-of-view (FOV), a total of ~30 video cameras are installed at Sanya and Ledong, where each camera is operated with a relatively small FOV of about 15°. On the other hand, five more video cameras are equipped with 600 (or 1000) lines/mm gratings for spectra observation to characterize meteor composition.

MIOS-Radar Subsystem:

The MIOS – radar subsystem is designed with an operating frequency of 47.5 MHz and a peak power of 72 kW. It is sensitive to irregularities of 3-m scale size and is a useful tool to study meteor trail and ionospheric irregularities. The radar antenna array is composed of 15 identical modules (each module consists of 3×3 three element Yagi antennas) aligned in a sword-like shape that can receive echoes separately and independently. Six modules are for transmission and reception, and the other modules are only for reception. The configuration of spaced antenna modules enables the radar to get the unambiguous positions of backscatter echoes through interferometry analysis. The MIOS-radar subsystem also incorporates an all-sky meteor radar (operational frequency of 38.9 MHz) to observe specular and non-specular meteor echoes from all-sky coverage.