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When thrusters of the Soviet rocket carrier Interkosmos fired Aryabhata successfully into space from the Kapustin Yar cosmodrome in 1975, it was a historic lift-off that launched India’s satellite odyssey. Fifty years later, today the Indian Space Research Organisation (Isro) has built 131 satellites, 51 of which are presently in orbit. Named after the ancient astronomer, Aryabhata was the country’s first indigenously built satellite launched from Russian soil on April 19, 1975. Interestingly, it took just 30 minutes after the launch for the first signals to be relayed back to the Indian ground station located in Andhra Pradesh’s Sriharikota, located about 5,000 km away from the Soviet military rocket launch complex. The Rohini Sounding Rocket Experiment and subsequent experiments since 1963 from the Thumba Equatorial Rocket Launching Station in Thiruvananthapuram, established by Vikram Sarabhai, tasted success multiple times, but Isro’s plan of designing and building its own satellite launch vehicle (SLV) was still at the drawing board. This meant that India would have to join hands with spacefaring nations with existing satellite launching facilities. Collaborating with the USSR On May 10, 1972, India inked an agreement with the Academy of Sciences, the Union of Soviet Socialist Republics (USSR). Back then, the USSR had setup the Interkosmos programme towards undertaking joint research with other countries. It was also agreed upon that within two to three years, an Indian-made satellite would be launched from the Soviet cosmodrome. As India had discreetly conducted the first nuclear test at Pokhran in May 1974, an upset United States imposed certain sanctions on the country, obstructing any transfer of knowledge or technology that may prove handy towards building Aryabhata. Given the world order then, Pramod Kale, former director of the Vikram Sarabhai Space Centre, even suggested that the name Indo-Soviet Satellite Programme be changed to the Indian Scientific Satellite Programme, so it would possibly draw fewer international eyeballs on the nation’s space ambitions. [caption id="attachment_9953116" align="alignnone" width="600"] The quasi-spherical shaped Aryabhata. (Photo: Isro)[/caption] Though Isro was established near Thiruvananthapuram considering its proximity to the equator – for conducting experiments during the formative years – the very presence of the sea nearby and the recurrent salt water splashes prevented the setting up of the quintessential instrumentation or clean room facilities for space activities in Kerala’s capital. Speaking to The Indian Express, Kale said, “That is when it was decided to shift the activities to Bangalore, which offered close proximity to institutions like the Hindustan Aeronautics Limited (HAL), along with a conducive environment supported by the presence of industries. The Isro Satellite Systems Project was established at Peenya village, once known as Asia’s largest chain of small and medium-scale industries producing engineering and electronics goods. Designing and building Aryabhata U R Rao, credited with developing India’s satellite technology, led a 200-member team of engineers and scientists who went on to build Aryabhata at Peenya. Designed with 26 sides and weighing 358 kg, the spacecraft’s quasi-spherical shape was unique. Aryabhata included three scientific experiments: for X-ray astronomy, for observing solar neutrons and gamma rays, and one for studying the upper atmosphere. The quasi-spherical structure caught the attention of locals in Peenya. S Radhakrishnan, 72, who worked at a factory in Peenya in the 1970s, said, “Every working day, my colleagues and I would walk past the shed ‘A’ (where Isro teams worked) to reach our industry located in shed ‘C’. On some occasions, the Isro engineers would be seen flying some objects and on others, performing some tests or experiments, but we had no clue what they were up to.” He also mentioned another memory with regard to Aryabhata: catching a glimpse of the then prime minister Indira Gandhi, who had made multiple trips to Bangalore, inspecting Aryabhata at crucial stages ahead of its launch. “Upon learning that the prime minister was visiting, I took some time off duty to catch a glimpse of Indira Gandhi,” Radhakrishnan recalled. Underneath the shed in Peenya, several first-of-its kind infrastructural facilities – the electronics laboratories, clean room for the final assembly of the satellite, thermal laboratories, control and stabilisation laboratories, antenna testing facilities, a workshop and draughting sections – were set up. For nearly 30 months, the Isro teams worked for the development of the satellite’s prototypes and testing of the multiple models, ensuring that the highest reliability was achieved. Some of these tests included qualification in a thermo-vacuum chamber, vibration and shock tests. The satellite model was even taken up in a helicopter over Sriharikota during January 1975, kept almost stationary at various distances and altitudes from the ground station and the two-way communication link between the satellite and the ground telemetry station at Sriharikota was checked under simulated power levels of the transmitters. [caption id="attachment_9953121" align="alignnone" width="600"] Assembly work in progress for Aryabhata in Bengaluru. (Photo: Isro)[/caption] Tests were done on a balloon at 25 km in May 1973. The instruments for the scientific experiments, too, were tested and, lastly, the communication link was tested at 400 km, noted Rao in a 1978 research paper published by the Indian Academy of Sciences. During the first quarter of 1975, the final fabrication phase of two flight models was completed along with the complete integration and testing of the actual flight model performed during the same period. Simultaneously, in Bangalore, other ground-based support and tracking like the telemetry, telecommand and the communication units were being readied. The functioning of the entire ground station was tested using a helicopter-borne satellite model and simulating the transmitter power levels for the maximum range that the satellite will have during its orbit, to ensure that the ground station can receive the telemetered data from the satellite and send commands to the satellite. A Mission Operations and Control Centre was set up at Peenya that would coordinate the commanding as well as data-gathering programme from various ground stations. Even though all the three scientific experiments onboard Aryabhata had to be called off owing to power failure, other technological experiments were performed based on the use of the onboard telecommand, putting to use the transmitter-receiver for data transmission from one station to another using the satellite as a node. Lasting impact Today, half a century later, satellite-based communication is well-established and is being widely used, but its roots in India can easily be traced back to Aryabhata and Isro. The first voice transmission of a recorded speech was transmitted from Sriharikota to Bangalore via Aryabhata. Due to its high quality, another experiment involving electrocardiogram (ECG) signals was similarly transmitted – a demonstration of the opportunities and unlimited possibilities that satellite communication could offer in future. The India Meteorological Department in Pune assisted Isro in setting up a weather data gathering (wind speed, temperature, wind direction) platform from standard data collection points. With over 12,000 electronic components, 20,000 solar cells and more than 25,000 interconnections within the satellite, Aryabhata was a demonstration of India's indigenous abilities to undertake the structural designing of a space-worthy satellite, fabricate and test it, develop thermal and power control systems as well as an entire ground station along with data processing systems.