ISRO General News and Updates

[fire starter]

details of isro scramjet vehicle.

 

[Indx TechStyle]

ISRO gears up for two launches in November

 

[Eva Braun]

Since when the flight to the Moon costs cheaper than produce the film? The upcoming Indian mission Chandrayaan-2 is cheaper than Hollywood's 2014 movie Interstellar...

 

[Indx TechStyle]

Since when the flight to the Moon costs cheaper than produce the film? The upcoming Indian mission Chandrayaan-2 is cheaper than Hollywood's 2014 movie Interstellar...

Chandrayaan-2 isn't upcoming, it's already realised. Chandrayaan-3 is due for launch in March 2021.

 

[Cheran]

posting this here

 

[fire starter]

 

[Haldilal]

Y'll Nibbiars ISRO's GSAT-30 is so far the only Indian satellite launched this year. It was launched by an Ariane-5 rocket with another European satellite. In 2019, 8 Indian satellites were launched. A similar number was planned for 2020, then Kung Flu Virus arrived. Next launch will be in Nov/Dec 20.

 

[sorcerer]

Hyderabad: India’s first private cryogenic rocket engine unveiled

Hyderabad: India’s first private cryogenic rocket engine unveiled | Hyderabad News - Times of India

After emerging as India's first private company to have successfully test fired an upper stage rocket engine, Hyderabad-based space-tech startup Skyro

timesofindia.indiatimes.com

 

[HawkisRight]

Since when the flight to the Moon costs cheaper than produce the film? The upcoming Indian mission Chandrayaan-2 is cheaper than Hollywood's 2014 movie Interstellar...

R u a Time travelar?
How's life on that side?

 

[Indx TechStyle]

Slides from VSSC director.
Notable, a new RLV-ORV (GSLV mounted RLV)
A new rocket called "test vehicle" to validate VTVL,

Heavy lift launchers with capacity of 20-30 tonnes to LEO; Super heavy lift rocket with cap. 130 tonnes to LEO (Saturn-V equivalent)

Nuclear propulsion

Manned missions to moon and mars.

 

[Akula]

Slides from VSSC director.
Notable, a new RLV-ORV (GSLV mounted RLV)
A new rocket called "test vehicle" to validate VTVL,

Heavy lift launchers with capacity of 20-30 tonnes to LEO; Super heavy lift rocket with cap. 130 tonnes to LEO (Saturn-V equivalent)

Nuclear propulsion

Manned missions to moon and mars.

HLV booster design is similar to SpaceX falcon. If you notice there are legs on the bottom. And that's why payload capacity is low as it will carry more fuel for vertical landing.

 

[Indx TechStyle]

HLV booster design is similar to SpaceX falcon. If you notice there are legs on the bottom. And that's why payload capacity is low as it will carry more fuel for vertical landing.

This is a PPT using random pics of unrealised technologies for representational purpose from other countries. Design of space station or HLVs here is to be taken with a pinch of salt.

 

[fire starter]

 

[fire starter]

 

[Karthi]

ndia’s Astrosat Completes 5 Years Of Mapping Stars, Galaxies In Space

Astrosat, India’s first multi-wavelength astronomical observatory, on Monday completed five years of imaging celestial objects in space. Launched by the Indian Space Research Organisation (ISRO) on September 28 2015, in the five years of its operation Astrosat has achieved quite a feat.

It has carried out 1,166 observations of 800 unique celestial sources proposed by scientists both from India and abroad, a statement by the Department of Science and Technology (DST) said.

Astrosat has explored stars, star clusters, mapping of large and small satellite galaxies of the Milky Way called “Magellanic Clouds”, an energetic phenomenon in the Universe such as the ultra-violet counterparts to gamma-ray bursts, supernovae, active galactic nuclei.

“Its superior spatial resolution capability has enabled astronomers to probe star formation in galaxies as well as resolve the cores of star clusters (three times better than the last NASA mission, GALEX),” the statement said.

“Observations from UVIT has recently led to the discovery of a galaxy located at a distance of about 10 billion light-years from Earth and emitting extreme ultraviolet radiation that can ionize the intergalactic medium,” it said.

Astrosat has proved to be an important satellite capable of carrying out simultaneous observations over a range of wavelengths from the far ultraviolet to the hard X-ray band.

The Ultra-Violet Imaging Telescope, or the UVIT, is a remarkable 3-in-1 imaging telescope simultaneously observing the visible, the near-ultraviolet (NUV), and the far-ultraviolet (FUV) spectrum. It is one of the five payloads on board AstroSat.

Weighing a total of of 230 kilograms, the UVIT comprises two separate telescopes. One of them works in the visible (320-550 nm) and the NUV (200-300 nm). The second works only in the FUV (130-180 nm).

The UVIT project was led by the Indian Institute of Astrophysics (IIA), an institute of the DST in collaboration with the Inter University Centre for Astronomy and Astrophysics, Pune, the Tata Institute of Fundamental Research, Mumbai, several centres of ISRO and the Canadian Space Agency.

“The Ultra-Violet Imaging Telescope, which is a marvellous piece of engineering, is a testimony to the power of several scientific agencies working together in multidisciplinary mode with a shared purpose,” said Ashutosh Sharma, secre

 

[Karthi]

ATV Configuration

air flow past ATV d02 with H2-air Combustion

Scramjet Ascent Vehicle

Infrared Thermography of RLV

W-T Schiliren photo of RLV ascent

Schiliren photography is a process to study the flow of fluids around a body

 

[Karthi]

dont know if anyone posted this kind of picture, Various satellites integrated into the payload section .

 

[fire starter]

 

[Karthi]

Multi satellite Adaptor for PSLV.

V band Low Noise Amplifier

Space Applications Centre of ISRO has developed a low noise amplifier designed
at V band. It operates at 50-60 GHz and gives a gain of 7-10dB. The typical noise
figure is less than 5dB. It is also a medium power amplifier with 14dB output
power at 1dB gain compression. The amplifier has waveguide WR-15 interface at
the input and output.


Typical applications

• EW Receivers
• Weather & Military ultra wideband radar
applications
• Ultra wideband communication
networks

Salient features

• Frequency: 50-60 GHz
• Noise Figure 5dB
• Gain 8.5dB (Higher Gain option available)
• Output Power at (@P1dB) 14dBm
• DC power consumption: 80mA, 3V
• Input / Output : Waveguide WR15

C band DC BIAS I/Q Mixer

Space Applications Centre of ISRO has developed a DC biased IQ mixer designed
to operate at C band. It is fabricated in size of 1inch x 1inch on 25 mil alumina.
Same circuit can be realized as is on TMM10i/RT6010 substrates. The novel use of
DC biasing provides reduction of local oscillator (LO) power to 4 dBm as compared
to 10 - 15 dBm of conventional I/Q Mixers. The circuit provides low conversion
loss and low amplitude and phase imbalance. It can be used as a single sideband
modulator and demodulator with very low LO power requirement.

typical applications
• EW Receiver / Transmitter
• Weather & Military Radars
• Single sideband modulator and
Image Rejection Mixers
salient features
• C Band IQ mixer with DC biasing for low power requirement
• Low conversion loss
• Good amplitude and phase balance
• Planar topography
• Realization amenable to Conventional Photo lithographic patterning on soft & hard substrates

OBC ASIC 8 bit Micro Controller



SAC has developed an On Board Controller (OBC) Application Specific Integrated
Circuit (ASIC) for central and distributed controllers of various microwave remote
sensing payloads. OBC ASIC architecture is based on DW8051 microcontroller core.


It contains a rich set of serial interfaces. It also contains parallel ports with a unique feature of event programmability, which makes I/O deterministic and reduces load of software for I/O task.





salient features
• DW8051 (8 bit microcontroller) core
• 4 UARTs, 3 Timers and 5 Interrupts
• 3 synchronous serial Tx/ Rx
• 4 Ports(32 bits) for parallel I/O
• 6 Event Programmable ports (48 bits)
• 6 Programmable Timing Signals
• Auxiliary Data Interface (256 Bytes)
• Two 8 bit Delta Sigma ADCs (with external R,C & comparator)
• Watchdog Time
• Programmable Combinational Logic Module (similar to FPGA CLB)
• On chip monitor program for ICP
• JTAG boundary scan chain
• 0.6μ CMOS RadHard Digital Tech.
• Supply : 5 Volts for Core & I/O
• Package : CQFP 256 pins
• I/O : 5V CMOS compatible with 4ma/8ma drive (total 224 I/Os)
• Clock Frequency: 16 MHz (Max)
• 300K NAND2 equivalent gates
• QML-V Qualified
• ESD sensitivity: 2KV
• Radiation Performance tID ≥ 100Krad (Si) LET (no latchup) ≥ 128 MeV - m2/mg seU rate ≤ 1.6 x 10-10 errors/ bit day

SPACE QUALIFIED C-BAND MMIC’s

Space Applications Centre of ISRO has developed seven types of MMICs flown in
RISAT – 1. These MMICs are used for the development of Transmit Receive modules.


ISRO offers to license this technology of these MMICs to industries with adequate
experience and facilities. Enterprises interested in obtaining knowhow may write
giving details of their present activities, infrastructure and facilities to us.

6 -Bit digital attenuator
• 5350 ± 125 MHz
• 31.5dB dynamic range
• 6-bit, 0.5 dB step
• Insertion Loss: 4.5 dB

6 -Bit digital phase shifter
• 5350 ± 125 MHz
• 360 deg dynamic range
• 6-bit, 5.625 deg step
• Insertion Loss: 7 dB

SPDT switch
• 5350 ± 125 MHz
• Insertion Loss: 2.5 dB
• Isolation : 30 dB



MediUm power amplifier-1
• 5350 ± 125 MHz
• 32 dB gain
• 15 dBm
medium power amplifier-2
• 5350 ± 125 MHz
• 15 dB gain
• 25 dBm
small signal amplifier
• 5350 ± 125 MHz
• 25 dB Gain
• 13 dBm
• 4 dB NF
low noise amplifier
• 5350 ± 125 MHz
• 2.6 dB NF
• 25 dB gai

Transmit Receive Module for Radar Applications

Space Applications Centre of ISRO has developed a transmit receive (TR) module
which is very useful for radar applications. Here, both transmit and receive chains
are accommodated in a single small housing for achieving good noise figure in
receive path and power in transmit path. This MMIC based TR module is flown
in Radar Imaging Satellite (RISAT–1). It is a building block for radars and finds its
applications in weather radar, ground based radar etc. Each TR Module consists of
a low power TR switch to select either of the transmit or receive paths. It has a
weight of 420 gms.

Amplitude Tilt Active Equalizer



Indian Space Research Organisation (ISRO) at its Space Applications Centre (SAC) has developed an Amplitude Tilt Active Equalizer for frequency and temperature compensation of microwave systems. The equalizer is having octave bandwidth performance and is used for the developed broadband ALC channel amplifiers and linearizers at Ku-Band frequency for GEOSAT payload projects.



Salient features
• Capable to generate positive, negative or zero slope over frequency by varying
the control voltage
• Suitable to optimize gain flatness of any microwave circuit/system over
frequency of operation
• Capable for temperature compensation of microwave circuits/systems



Applications
• electronically controlled gain slope over frequency up to ± 8 dB
• Gain control of microwave system with adjustable slope over frequency.
• Gain control of microwave system with adjustable slope over temperature
• Development of broadband microwave subsystem such as receivers, channel amplifiers, linearizers

ALC Driver Amplifier

Indian Space Research Organisation (ISRO) at its Space Applications Centre (SAC) has designed , developed and qualified a Automatic Level Control (ALC) Driver Amplifier. The system has been used in ISRO’s GEOSAT payload projects.



Salient features
• Frequency : 11.45 GHz to 11.7 GHz
• 3rd order IMD: <-30 dBc
• Mode of Operation: Fixed Gain or ALC
• Gain (FGM): Commandable from 24 dB to 44 dB
• Dynamic Range: 20 dB
(input from -44 to -24 dBm)
• Output Power: Commandable from 0 to -20 dBm



applications
• ALC Driver Amplifier contributes nearly 44 dB transponder linear gain and also
provides required input drive to the TWTAs. Its commandable gain setting
feature is used to control the transponder overall gain and drive level of
the TWTA.
• This driver amplifier also can be used in any system where commandable/
adjustable gain from 24 dB to 44 dB is required with the provision of
ALC system. The performances of the driver amplifier are temperature
compensated over the temperature range of -10 to +60 deg C.

Power Conditioning and Processing Unit



SAC has developed a Power Conditioning and Processing Unit (PCPU) for use in
microwave remote sensing missions. PCPU is a very complex multi output dc - dc
converter that delivers around 100W of peak power and around 10W of average
power. Here, Planar magnetics is used for the first time which was realized using
18 and 16 layer PCBs.



technological features

Thick film technology
• SMT technology
• Planar Magnetics
• Magnesium alloy for weight reduction
• Hybrid Micro – Circuits


salient features of PCPU

• Powers a pair of V&H TR Modules and a TRC unit
• 10 outputs: 8 pulsed + 2 continuous
• 59W pulse output power
• 9.1W average output power
• High BW pulse modulators for fast rise & fall times on pulsed outputs
• In-built EMI filter isolates the satellite bus from the pulsed load transients.

64 Channel Analog multiplexer



Indian Space Research Organisation (ISRO) at its Space Applications Centre (SAC) has designed and developed a HAMUX-64 HMC, a 64 channel analog multiplexer using multilayer thick film hybrid technology. This 64 channel analog multiplexer will find special applications.

Salient features
• 64 channel with ESD & Over voltage protection
• Provision for Internal / External reference voltage
• Buffered (Op-amp) and Un-buffered (Mux) output
• Cascadable up to 256 channels
• Compliant as per ISRO-PAS-206
• Radiation: TID upto 100K Rads (Si)
• Inter-channel Cross talk: 35db (Max)@50KHz

 

[Karthi]

Nano Satellite Ejection System

Telescopic Chatter Free poppet Check Valve

Near Field Test Range Facility

pilot operated command valve

Integrated X-band feed assembly