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Earth, Planets and Space

Table 1 Specification of the VHF radar of Chumphon station, Thailand

From: Classification of the equatorial plasma bubbles using convolutional neural network and support vector machine techniques

Location

10.72° N, 99.37° E

(Geomagnetic latitude: 1.33° N)

Operating frequency

39.65 MHz

Antenna

18 three-element Yagi antennas

Gain

22 dBi

Azimuth of beam direction (s)

− 60, − 48, − 36, − 24, − 12, 0, 12, 24, 36, 48, 60

Inter-pulse period (IPP)

6 ms

Transmitted pulse

32 Ms × 8-bit complementary code

Beam steering

Every 2 IPP

Range resolution

4.8 km

Number of coherent integrations

2

Number of FFT coefficients

256

Number of incoherent integrations

1

Range

140–860 km

Number of ranges

150

Observation time

33.792 s

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