u/Ohsin

> Invitation for Expression of Interest for Supply of Optical Communication Terminal for LEO and GEO Satellites

[PDF] [Archived]

> SAC-ISRO invites Expression of Interest (EoI) from Global Vendors /OEMs with capability for suppling space-qualified Optical Communication Terminals for LEO and GEO Satellites.

> The objective of this EoI is to explore the Global OCT vendors and their capabilities to meet the ISRO’s requirements.

> The EoI intends to identify potential vendors for OCTs required for realizing end to end optical link with ISRO’s LEO and GEO satellite platforms. The outcome of this EoI may be directly incorporated in the RFP at the later stage as per mission requirements. This EoI is intended solely to assess technical capability, readiness level and heritage of participating Vendors/OEMs and does not ensure a commitment for procurement at this stage

> The objectives of this EoI are mentioned as per followings: > > 1. To explore and identify global vendors with end-to-end capabilities of OCT development for LEO and GEO satellites. > > 2. Identifying vendors with proven technology and heritage of LEO-LEO, LEO-GEO, LEO/GEO-GND bidirectional optical communication links. > > 3. OCT System parameters for link budget estimation for different link scenarios i.e., LEO-LEO, LEO-GEO, LEO/GEO-GND in bidirectional mode. > > 4. Satellite interface requirements for data, timing reference, power, thermal, telemetry and tele-commands. > > 5. Satellite requirements for ultra-stable pointing and long-term thermal stability of OCTs. > > 6. Qualification plan of integrated OCT as a system as well as for sub system/component level. > > 7. Compliance with space environment, reliability and mission life requirements. > > 8. Link availability and redundancy for mission-critical services. > > 9. Test and Characterization procedures for OCTs at different stages starting from OCT payload realization, AIT with spacecraft, till in-orbit validation and in actual operational scenarios. > > 10. Ground System requirements and compatible available OGS for OCTs for pre and post commission phases. > > 11. The long term storage and re-validation philosophy for OCT.

Source: https://www.notams.faa.gov/

Mapped up!

---

A1541/26

GSLV-F17 ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA WILL TAKE 
PLACE AS PER FLW DETAILS.THE LAUNCH WILL BE ON ANY ONE 
OF THE DAY DRG THIS PERIOD.ACTUAL DATE OF LAUNCH WILL BE 
INTIMATED ATLEAST 24 HR IN ADVANCE THROUGH A SEPARATE NOTAM. 
 
LAUNCH PAD COORD: 134312N 0801348E 
NO FLT IS PERMITTED OVER THE DNG ZONES. 
 
 
1) DANGER ZONE -1: IS A CIRCLE OF 10 NM AROUND THE LAUNCHER. 
 
2) DANGER ZONE -2: IS AN AREA BOUNDED BY FLW COORD: 
I.?1200N 08440E 
II.?1230N 08450E 
III.?1205N 08610E 
IV.?1135N 08600E 
V. 1200N 08440E 
 
3) DANGER ZONE -3: IS AN AREA BOUNDED BY FLW COORD: 
I.?1055N 08750E 
II.?1135N 08800E 
III.?1045N 09030E 
IV.?1005N 09020E 
V. 1055N 08750E 
 
 
RTE AFFECTED IN CHENNAI FIR: 
W20, Q11, Q23, Q24, V4, V9, P761, P762, N877, N571 
 
CLOSURES/ALTN RTE FOR OVERFLYING: 
 
1. W20 NOT AVBL BTN MMV-KAMGU 
 ALTN: MMV-DCT-DOHIA-DCT-RAMDO-DCT-KAMGU 
 
2. Q11 NOT AVBL BTN GURAS-MMV 
 ALTN: GURAS-DCT-MMV 
 
3. Q23 NOT AVBL BTN RINTO-MMV 
 ALTN: RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
4. Q24 NOT AVBL BTN MMV-KAMGU 
 ALTN: MMV-DCT-DOHIA-DCT-RAMDO-DCT-KAMGU 
 
5. V4 NOT AVBL BTN BOPRI-MMV 
 ALTN: BOPRI-DCT-RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
6. V9 NOT AVBL BTN GUNRI-MMV 
 ALTN: GUNRI-V11-TTP-DCT-GUANI-DCT-MMV 
 
7. P761 NOT AVBL BTN IDASO-DUMAR 
 ALTN: IDASO-DCT-EGOLU-L518-DUMAR 
 
8. P762 NOT AVBL B TN BIKEN-NIMOV. NO ALTN RTE 
 
9. N571 NOT AVBL BTN IDASO-BIKEN 
 ALTN: VATMO-DCT-GIRNA-BIKEN 
 
10. N877 NOT AVBL BTN DUMAR-AGEGA 
 ALTN: DUMAR-P761-LEGIN-L510 
 
DEP FM CHENNAI MAY FPL AS FLW: 
 
1. W20/Q24 NOT AVBL BTN MMV-KAMGU 
 ALTN: MMV-DCT-DOHIA-DCT-RAMDO-DCT-KAMGU 
 
ARR TO CHENNAI MAY FPL AS FLW: 
 
1. Q11 NOT AVBL BTN GURAS-MMV 
 ALTN: GURAS-DCT-MMV 
 
2. Q23 NOT AVBL BTN RINTO-MMV 
 ALTN: RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
3. V4 NOT AVBL BTN BOPRI-MMV 
 ALTN: BOPRI-DCT-RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
4. V9 NOT AVBL BTN GUNRI-MMV 
 ALTN: GUNRI-V11-TTP-DCT- GUANI-DCT-MMV
GSLV-F17 ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA WILL TAKE 
PLACE AS PER FLW DETAILS.THE LAUNCH WILL BE ON ANY ONE 
OF THE DAY DRG THIS PERIOD.ACTUAL DATE OF LAUNCH WILL BE 
INTIMATED ATLEAST 24 HR IN ADVANCE THROUGH A SEPARATE NOTAM. 
 
LAUNCH PAD COORD: 134312N 0801348E 
NO FLT IS PERMITTED OVER THE DNG ZONES. 
 
 
1) DANGER ZONE -1: IS A CIRCLE OF 10 NM AROUND THE LAUNCHER. 
 
2) DANGER ZONE -2: IS AN AREA BOUNDED BY FLW COORD: 
I.?1200N 08440E 
II.?1230N 08450E 
III.?1205N 08610E 
IV.?1135N 08600E 
V. 1200N 08440E 
 
3) DANGER ZONE -3: IS AN AREA BOUNDED BY FLW COORD: 
I.?1055N 08750E 
II.?1135N 08800E 
III.?1045N 09030E 
IV.?1005N 09020E 
V. 1055N 08750E 
 
 
RTE AFFECTED IN CHENNAI FIR: 
W20, Q11, Q23, Q24, V4, V9, P761, P762, N877, N571 
 
CLOSURES/ALTN RTE FOR OVERFLYING: 
 
1. W20 NOT AVBL BTN MMV-KAMGU 
 ALTN: MMV-DCT-DOHIA-DCT-RAMDO-DCT-KAMGU 
 
2. Q11 NOT AVBL BTN GURAS-MMV 
 ALTN: GURAS-DCT-MMV 
 
3. Q23 NOT AVBL BTN RINTO-MMV 
 ALTN: RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
4. Q24 NOT AVBL BTN MMV-KAMGU 
 ALTN: MMV-DCT-DOHIA-DCT-RAMDO-DCT-KAMGU 
 
5. V4 NOT AVBL BTN BOPRI-MMV 
 ALTN: BOPRI-DCT-RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
6. V9 NOT AVBL BTN GUNRI-MMV 
 ALTN: GUNRI-V11-TTP-DCT-GUANI-DCT-MMV 
 
7. P761 NOT AVBL BTN IDASO-DUMAR 
 ALTN: IDASO-DCT-EGOLU-L518-DUMAR 
 
8. P762 NOT AVBL B TN BIKEN-NIMOV. NO ALTN RTE 
 
9. N571 NOT AVBL BTN IDASO-BIKEN 
 ALTN: VATMO-DCT-GIRNA-BIKEN 
 
10. N877 NOT AVBL BTN DUMAR-AGEGA 
 ALTN: DUMAR-P761-LEGIN-L510 
 
DEP FM CHENNAI MAY FPL AS FLW: 
 
1. W20/Q24 NOT AVBL BTN MMV-KAMGU 
 ALTN: MMV-DCT-DOHIA-DCT-RAMDO-DCT-KAMGU 
 
ARR TO CHENNAI MAY FPL AS FLW: 
 
1. Q11 NOT AVBL BTN GURAS-MMV 
 ALTN: GURAS-DCT-MMV 
 
2. Q23 NOT AVBL BTN RINTO-MMV 
 ALTN: RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
3. V4 NOT AVBL BTN BOPRI-MMV 
 ALTN: BOPRI-DCT-RINTO-V11-TTP-DCT-GUANI-DCT-MMV 
 
4. V9 NOT AVBL BTN GUNRI-MMV 
 ALTN: GUNRI-V11-TTP-DCT- GUANI-DCT-MMV. GND - UNL, 0315-0715, 21 MAY
03:15 2026 UNTIL 10 JUN 07:15 2026. CREATED: 07 MAY 07:16 2026

Technology Transfer of ISRO Navigation Sensors to Industry

A Technology Transfer Handholding Event was conducted on 27th April, 2026 at Hyderabad, wherein technology development documents for advanced navigation sensors — Laser Gyroscope and Ceramic Servo Accelerometer, developed by ISRO Inertial Systems Unit (IISU)/ISRO, were transferred to M/s Zetatek Technologies Pvt. Ltd., Hyderabad.

The event took place at the premises of Zetatek Technologies in the presence of officials from IISU, NSIL, and Zetatek Technologies, marking a significant step towards enhanced industry participation.

The Laser Gyroscope measures angular velocity with high precision, while the Ceramic Servo Accelerometer measures linear acceleration with high stability for navigation applications.

This transfer is expected to strengthen indigenous capabilities and promote self-reliance in critical navigation technologies

NewSpace India Limited (NSIL) has extended Launch and Early Orbit Phase (LEOP) and Telemetry, Tracking, and Command (TT&C) support to M/s GalaxEye Space for their maiden satellite mission, Drishti. These services are being delivered through the ISRO Telemetry, Tracking and Command Network (ISTRAC) centre of ISRO which is responsible for mission operations and satellite tracking.

This underscores NSIL’s commitment for enabling and supporting emerging private space enterprises in India by providing critical mission support infrastructure, services and ISRO expertise. The successful provision of LEOP and TT&C services marks an important milestone for GalaxEye Space as they undertake their first satellite mission. Drishti mission is a unique satellite comprising of both optical and SAR imaging capabilities on a single platform. NSIL wishes Team GalaxEye all the best for the newly launched satellite mission.

Source: https://www.sakshi.com/telugu-news/tirupati/2773614

Google translated (Formatting mine)

> When is the GSLV F-17 Launch?

> * Target Date: March 21

> * Launches Halted Due to Consecutive Failures

> Sullurpeta: At a time when the Indian Space Research Organisation (ISRO) was surging ahead with a string of successes, two consecutive failures involving the PSLV series have brought space launches to a standstill for a considerable period. Had these two missions been successful, the GSLV F-17 launch would have likely taken place by March 21. Currently, however, an uncertain situation prevails, with no clear indication as to when this particular launch will be conducted. Integration work for the GSLV F-17 rocket is currently underway at the First Vehicle Assembly Building. The launch has faced further delays—a temporary halt—due to a technical glitch identified in the ring designed to mount the satellite atop the third (cryogenic) stage. Scientists explain that the specifications of the ring received were incorrect; it lacked the structural strength required to support the weight of the satellite. They state that a ring with superior structural integrity is required as a replacement, and the process of mounting the satellite will only commence once the appropriate component has been procured. Consequently, the exact schedule for this mission remains unknown. Through this mission, ISRO is preparing to launch EOS-5, an Earth Observation Satellite weighing 1,117 kilograms. It is pertinent to recall that two recent missions—PSLV C61 (launched on May 18 last year) and PSLV C62 (launched on January 13 this year)—both ended in failure during their third stages due to identical technical anomalies. Consequently, the months of February, March, and April passed without any developmental activity. It remains doubtful whether any launches will take place even in May. ISRO scientists do not appear enthusiastic regarding the GSLV F17 mission. For the time being, the atmosphere at the Satish Dhawan Space Centre (SHAR) remains stagnant, with no signs of the usual bustle associated with launch preparations.

---

Original text:

> జీఎస్‌ఎల్‌వీ ఎఫ్‌–17 ప్రయోగం ఎప్పుడో? > > * టార్గెట్‌ మార్చి 21వ తేదీ > > * వరుస వైఫల్యాలతో ప్రయోగాలకు బ్రేక్‌ > > సూళ్లూరుపేట:భారత అంతరిక్ష పరిశోధన సంస్థ (ఇస్రో) వరుస విజయాలతో దూసుకెళుతున్న సమయంలో వరుసగా రెండు పీఎస్‌ఎల్‌వీ వైఫల్యాలతో ప్రయోగాలకు చాలాకాలం బ్రేక్‌ పడింది. ఈ రెండు ప్రయోగాలు విజయవంతమై ఉంటే మార్చి నెల 21 నాటికే జీఎస్‌ఎల్‌వీ ఎఫ్‌–17 ప్రయోగం జరిగి ఉండే ది. ప్రస్తుతం ఈ ప్రయోగం కూడా ఎప్పుడు నిర్వహి స్తారో తెలియని అగమ్యగోచరమైన పరిస్థితి నెలకొంది. జీఎస్‌ఎల్‌వీ ఎఫ్‌–17 రాకెట్‌ అనుసంధానం పనులు మొదటి వెహికల్‌ అసెంబ్లింగ్‌ భవనంలో నిర్వహిస్తున్నారు. మూడో దశ అంటే క్రయోజనిక్‌ దశకు పైభాగంలో శాటిలైట్‌ అమర్చే రింగ్‌ విషయంలో సాంకేతిక లోపం తలెత్తి ఈ ప్రయోగం కూడా మరి కొంతకాలం బ్రేక్‌ పడింది. ఈ రింగ్‌ పంపేటప్పుడు మారిపోయిందని, శాటిలైట్‌ మోసే అంత స్టంట్‌ లేని రింగ్‌ను పంపారని, దీనికి బదులుగా బాగా స్టంట్‌ ఉన్న రింగ్‌ అవసరం ఉందని అది వచ్చిన తరువాతే శాటిలైట్‌ అమర్చే ప్రక్రియను చేపడతారని శాస్త్రవేత్తలు చెబుతున్నారు. ఈ ప్రయోగాన్ని ఎప్పుడు చేస్తారో తెలియని పరిస్థితి నెలకొంది. ఈ ప్రయోగం ద్వారా 1,117 కిలోల బరువు కలిగిన ఈఓఎస్‌–5 ఉపగ్రహా న్ని పంపేందుకు ఇస్రో సిద్ధమవుతోంది. అయితే గత ఏడాది మే 18న పీఎస్‌ఎల్‌వీ సీ61, ఈ ఏడాది జనవరి 13న ప్రయోగించిన పీఎస్‌ఎల్‌వీ సీ62 రెండు ప్రయోగాలు మూడో దశలో ఒకే సాంకేతికపరమైన కారణాలతో వైఫల్యం చెందిన విషయం తెలిసిందే. దీంతో ఫిబ్రవరి, మార్చి, ఏప్రిల్‌ నెలల్లో ఎలాంటి అభివృద్ధి లేకుండా పోయింది. మే నెలలో అయినా ప్రయోగాలు ఉంటాయా; అన్న విషయం అనుమానంగానే ఉంది. జీఎస్‌ఎల్‌వీ ఎప్‌17 ప్రయోగం విషయంలో ఇస్రో శాస్త్రవేత్తలు ఉత్సాహంగా కనిపించడం లేదు. ప్రస్తుతానికి సతీష్‌ ధవన్‌ స్పేస్‌ సెంటర్‌(షార్‌)లో కూడా ప్రయోగాల సందడి కనిపించకుండా పరిస్థితి స్తబ్దుగా ఉంది.

Tender for Gravity Offset System for Human Space Flight Centre (HSFC)

Main :

[PDF] [Archived]

Technical specifications:

[PDF] [Archived]

> The Gravity Offset System Facility is a highly specialized Ground based infrastructure designed to simulate reduced-gravity environments such as those experienced on the Moon (0.167g), Mars (0.375g), or in microgravity.

> Primary Objectives of the gravity offset system:

> 1. To perform Test and provide training to astronauts on how to work in reduced gravity and microgravity environment for Human space flight missions. > 2. To Develop & Assess Countermeasure exercises (effectiveness to counter muscle atrophy and bone density loss). > 3. To study the human body’s adaptation and response to reduced gravity conditions for long-duration missions.

> It provides critical support for testing spaceflight hardware, robotic systems, and extravehicular mobility units (EMUs), as well as for astronaut training, rehabilitation research, and assistive technology development.