About RazakSAT®

 

RazakSAT® is a small Low Earth Observation (LEO) satellite orbiting the earth in uniquely Near Equatorial Orbit (NEqO) at nominal altitude of 685 km and 9 degrees inclination.  It carries the Medium-sized Aperture Camera (MAC) which is an electro-optical payload of a pushbroom camera type with 5 linear detectors (1 panchromatic, 4 multi-spectral).RazakSAT® operated through its ground segment in Malaysia, consists of a Mission Control Station (MCS) and an Image Receiving and Processing Station (IRPS). A team of satellite engineers operated the MCS and executing the RazakSAT® mission plan, command generation and telemetry receiving, archiving and analysis accordingly. The IRPS will receive and archive images for post processing and distribution to the users.

Figure 1 : RazakSAT® with solar panel deployment

RazakSAT® satellite has a Panchromatic band (510 - 730 nm) and 4 Multispectral Bands: Band 1: Blue (450 - 520 nm); Band 2: Green (520 - 600 nm); Band 3: Red (630 - 690 nm) and Band 4: Near-Infrared (760 - 890 nm). The spatial resolution of 2.5 m and 5 m for Panchromatic and Multispectral, respectively, covers a swath width of 20 km at the 685 km nominal altitude. Data is being quantized into 8 bits of 256 brightness values to represent information. With the high spatial resolution of 2.5 m, RazakSAT® allows a maximum scale of 1:25000 for mapping product.   The following table summarizes MAC data characteristics.

 

Table 1: RazakSAT® Specification

 

Item

Specifications

Orbit

Near Equatorial Low Earth Orbit

Altitude

685 km

Inclination

Mass

187.6  kg

Envelope

f1200mm ´ H1200mm

Attitude Control Accuracy

0.2°

Power

> 300 W

Payload

Medium-sized Aperture Camera

Mass Storage Capacity

32 Gbits

Data Down Link

30 Mbps (X-Band)

 

 

Table 2: RazakSAT® Data Characteristics

 

Spectral Bands

1 Panchromatic Band and

4 Multispectral Bands

Panchromatic Band

510 – 730 nm

Band 1: Blue

450 - 520 nm

Band 2: Green

520 - 600 nm

Band 3: Red

630 - 690 nm

Band 4: Near-Infrared

760 - 890 nm

Ground Sampling Distance (GSD)

PAN: 2.5 m

MS: 5.0 m

at 685 km

Swath Width

20 km

at 685 km

Signal to Noise Ratio

> 70

 

Quantization

> 8 bits

For all bands

10-bit encoding

Signal Gain

Programmable

 

Mass Storage

32 Gbits

(~ 500 km

image strip