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Main parameters of Dongfanghong-3 satellite
Project performance and parameters

Size (mm)

Star body 2220×2200× 1720

The satellite span is 18096 after the solar wing is deployed.

The satellite height after antenna deployment is 57 13.

Mass (kg)

Separation weight of star and arrow 2266

Launched into geostationary orbit (early life) 1206

Satellite dry weight 946

Reliability of single satellite (after 8 years) 0.66

Long March 3A carrier rocket

Launch from xichang satellite launch center

Communication load

The communication antenna is in a communication device,

2.0m diameter double-grid sensitive counter

Multi-feed shaped beam antenna

Transmit (downlink) gain (db)

① The first service area includes Hainan and Taiwan Province Province.

In offshore and mainland service areas.

Medium power channel ≥27

Other channels ≥26.5

② The second service area includes Dongsha, Zhongsha,

Xisha and other coastal areas.

Antenna gain ≥ 18.5

First service area ≥27

Receive (uplink) gain (dB)

Four receivers, C-band, 500MHz bandwidth

Receiver with 2× 2:1backup.

Number of channels

Number of TWTA channels with final power amplifier of 16W (units) 6

Number of SSPA channels with final power amplifier of 8W 18

Last stage power amplifier backup

16W TWTA adopts 3×2 backup.

8W SSPA has no cold backup. Except for three domestic SSPA.

15∶ 12 backup is used outside the transponder.

Uplink frequency (MHz) 5925~6425

Downlink frequency (MHz) 3700~4200

EIRP

TWTA channel correspondence 16W ≥37

SSPA channel corresponds to 8W ≥33.5.

Polarization mode linear polarization

Follow in the footsteps of

The two repeaters consist of FM receiver and phase modulation.

Demodulation transponder composed of transmitter

telemetering

Modulation system pulse amplitude modulation/pulse coding/phase shift keying

channel capacity

Analog quantity (unit) 423

Number of digits in each format 3072 (bits/second) (*** 17 format)

Carrier frequency (MHz) 4 192, 37 10.

telemetering

Modulation system pulse code modulation/phase shift keying/frequency modulation

channel capacity

Analog quantity (unit) 423

The number of digits in each format (bits per second) is 4 192, 37 10 3072(* * * 17 format).

Carrier frequency (MHz) 4 192, 37 10.

remote control

Modulation Mode Pulse Code Modulation/Phase Shift Keying/Frequency Modulation

Instruction Capacity (Strips) 620

Carrier frequency (MHz) 5926,5941

Attitude and orbit control

Both stable mode transfer and stable orbit are triaxial stable.

Antenna pointing error (3 σ) ()

Spacing -+0. 15

Scroll -+0. 15

Yaw -+0.48

Position retention error (3 σ) (0)

South/North direction -+0. 1

East/west direction -+0. 1

carry forward

Combustion agent methyl hydrazine (MMH)

Oxidant oxidant dinitrogen tetroxide (MON- 1)

Propellant loading (kg) 13 17

Pressurized helium

10N propeller (platform) 14 is divided into two "semi-systems".

490N apogee engine (set) 1

Power?Supply?

The solar cell wing has two wings, and each wing has three plates.

Output power of solar array at the end of 8 years (w) 1688

Ni-Cd battery capacity (Ah) 2×45