Inclined Geosynchronous Orbit (IGSO)

Same altitude as GEO but tilted — traces a figure-8 ground track over a single longitude.

IGSO has the same 24-hour period as GEO but at an inclined orbital plane. The result: from the ground, the satellite traces a figure-8 pattern over a single longitude. China's BeiDou IGSO segment and Japan's QZSS Quasi-Zenith system use this to provide enhanced coverage at high latitudes where pure GEO performs poorly.

Examples

• USA 159 (DSP 21)
• BEIDOU-2 IGSO-7 (C16)
• IRNSS-1B
• IRNSS-1E
• QZS-2 (QZSS/PRN 194)
• BEIDOU-2 IGSO-5 (C10)
• USA 176 (DSP 22)
• BEIDOU-2 IGSO-3 (C08)
• BEIDOU-2 IGSO-2 (C07)
• USA 170
• BEIDOU-3 IGSO-1 (C38)
• USA 115 (MILSTAR-1 2)
• BEIDOU-2 IGSO-4 (C09)
• SHIYAN-29
• USA 134
• BEIDOU-3S IGSO-1S (C31)
• INMARSAT 3-F2
• QZS-1R (QZSS/PRN 196)
• BSAT-2A
• SDO
• IRNSS-1A
• LUCH 5B (SDCM/PRN 125)
• BEIDOU-3 IGSO-3 (C40)
• UFO 2 (USA 95)