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Category: satellite projects
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Zafar Satellite

Zafar Satellite

Zafar satellite has been designed and built with three main missions of imaging, storing and sending data and measuring space radiation by order and systematic supervision of Iran Space Agency in Iran University of Science and Technology over 3 years in two samples Zafar-1 and Zafar-2. This LEO satellite with the mass of 113 kg was panned to operate at an altitude of 530 kilometers with an inclination of 56 degrees.

Zafar satellite has been designed and built with three main missions of imaging, storing and sending data and measuring space radiation by order and systematic supervision of Iran Space Agency in Iran University of Science and Technology over 3 years in two samples Zafar-1 and Zafar-2. This LEO satellite with the mass of 113 kg was panned to operate at an altitude of 530 kilometers with an inclination of 56 degrees.

In the space sector, the satellite includes the imaging, store and forward (S&F), and space radiation research payloads, and a series of subsystems of positioning, status determination and control, data and command management, energy, structure, and mechanism, and heat control. The ground section includes a station consisting of tele-command, telemetry, receiving images, and store and forward (S&F) payload management.

The following is a brief description of the missions, payloads and applications of Zafar satellite:

  1. Imaging Payload

Zafar-1: possessing a panchromatic imaging payload with a spatial resolution of better than 25 meters. Its applications are listed in Table (1).

Zafar-2: possessing a multi-spectral imaging payload with a spatial resolution of 16 meters. Its applications are listed in Table (2).

Zafar satellite has been designed and built with three main missions of imaging, storing and sending data and measuring space radiation by order and systematic supervision of Iran Space Agency in Iran University of Science and Technology over 3 years in two samples Zafar-1 and Zafar-2. This LEO satellite with the mass of 113 kg was panned to operate at an altitude of 530 kilometers with an inclination of 56 degrees.

In the space sector, the satellite includes the imaging, store and forward (S&F), and space radiation research payloads, and a series of subsystems of positioning, status determination and control, data and command management, energy, structure, and mechanism, and heat control. The ground section includes a station consisting of tele-command, telemetry, receiving images, and store and forward (S&F) payload management.

The following is a brief description of the missions, payloads and applications of Zafar satellite:

  1. Store and Forward (S&F) Payload:

The store and forward Payload subsystem consists of two general parts: S&F payload on satellite and ground handset. This satellite subsystem allows public broadcast of one user's message to all local users. The ability to establish one-way voice communication between two users, who are in satellite view simultaneously, is another function of this satellite subsystem. Another mission of this subsystem is the ability to send indirectly each user's message to the destination user (store and later forward); in this case, whenever a user, in satellite view, requests to receive a message from the S&F subsystem, a pre-saved message related to the user will be sent.

Therefore, S&F payload has two functional modes; Real-time voice communication, and store and later forward are possible. It depends on the user which mode to choose. If the user requests to send data, the S&F payload will be in store and later forward mode, and if the user requests to make a voice connection, the S&F payload will be in a real-time communication mode. With the ground S&F handset, the user can exchange messages with other users.

Given that the content of an A4 sheet of text message is about 3 kb; This amount is considered as the message volume and is defined as 256 users.

  1. Space Radiation Research Payload

The satellite research payload or SPU is sent with the satellite for research and experimental purposes. The task of the radiation research payload called SPU on Zafar satellite is to measure the amount of ionizing dose by cosmic rays received from space and also to detect their effect on semiconductor chips, including SRAM memories based on composite field-effect transistors. Cosmic rays and energetic particles outside the Earth's atmosphere and space cause bit reversal rate. Zafar satellite SPU board, using a central FPGA chip, provides the ability to measure the ionizing dose by 8 sensors cumulatively and 5 temperature sensors, and monitors and reports the bit reversal rate in the internal SRAM memories of an FPGA chip and external memories.