REOI FOR KU-BAND GROUND STATION FOR GISAT -EOI-001.pdf · March, 2015 REOI FOR KU-BAND GROUND...

March, 2015 REOI FOR KU-BAND GROUND STATION FOR GISAT

SDR&ISA / NRSC i

ISRO-NRSC-STSG -EOI-001

Request for Expression of Interest (REoI) for

Supply, Installation & Commissioning

Of

Ku-BAND GROUND STATION FOR GEO IMAGING SATELLITES

March 2015

Satellite Tracking Systems Group Satellite Data Acquisition Products and Services Area

National Remote Sensing Centre Indian Space Research Organization

Balanagar, Hyderabad-500625


SDR&ISA / NRSC ii

Contents

1 Introduction ............................................................................................................. 1

2 Scope of the work ................................................................................................... 2

3 Overall Technical Specifications ............................................................................. 4

4 System Description ................................................................................................. 6

5 RF Systems ............................................................................................................ 8

6 Antenna Control Servo Systems ............................................................................. 9

7 Mechanical Systems ............................................................................................. 12

8 Reliability & QA requirements ............................................................................... 14

9 Delivery Schedule ................................................................................................. 15

10 System Installation & Integration .......................................................................... 15

11 Acceptance Test plan ........................................................................................... 15

12 Vendor details ....................................................................................................... 16


SDR&ISA / NRSC iii

LIST OF TABLES

Table 3-1: Technical Specifications of Ku-band Antenna System ..................................................................... 4

Table 6-1: ACSS Specifications ........................................................................................................................ 9

Table 6-2: ACU Specifications ....................................................................................................................... 10

Table 8-1: Indoor Unit Environmental Specifications .................................................................................... 14

Table 8-2: Outdoor Unit Environmental Specifications ................................................................................. 14

Table 12-1: Vendor details ........................................................................................................................... 16

LIST OF FIGURES

Figure 4-1: Ku-band antenna system .............................................................................................................. 7


SDR&ISA / NRSC 1

1 Introduction

National Remote Sensing Centre (NRSC) is one of the prime centres of Indian Space

Research Organization (ISRO) under Department of Space, Government of India. The

prime responsibility of NRSC is acquisition of Earth Observation Data from Remote

Sensing Satellites, product generation & Dissemination as well as application

development, Aerial services and capacity building.

ISRO is planning to launch GISAT (Geo-Imaging Satellite) to meet National Disaster

Management requirements. Geo-Imaging spacecraft was conceived with the objective “

To tap new functionalities hitherto not covered by existing LEO & GEO Missions like fast

revisit capability, real time monitoring, high resolution multi spectral and Hyper spectral

imaging all on a single, agile, jitter free platform ”.

The objective of this document is to locate suitable vendors, who would be interested

and capable of establishing the Ku-band Remote Sensing Ground Station for GEO

Imaging satellites. The vendors shall have an experience in the establishment of

Antenna Systems for tracking and receiving data from LEO/GEO satellites.

Based on the information provided in this document, Vendors should come forward and

have technical discussions with NRSC to completely understand the requirements.

This document provides the preliminary information of Ku-band Remote Sensing

Ground Station intended to be established. The details and requirements identified in

this document may undergo some changes due to the on-going refinement of the

requirements and based on discussions with the vendors in order to make it most

suitable for intended applications.

The final Request for Proposal (RFP) will be prepared after detailed discussions with

vendors and will include the final specifications. The vendors should provide budgetary

estimates along with delivery schedules for different possible options/configurations.


SDR&ISA / NRSC 2

The work includes supply, installation and commissioning of Ku-band Remotes Sensing

Ground stations at three different locations in India. The ground station should have the

capability to track the GISAT series of satellites in GEO orbit. GISAT transmits payload

data in Ku band with an EIRP of 43dBW and its frequency range is from 12.25 to 12.45

GHz at 200 Mbps data rate using QPSK Modulation scheme.

2 Scope of the work

NRSC intends to entrust the task of supply and installation of ‘Ku-band Remote sensing

Ground Station’ to an industry on turnkey basis. The implementation of the project

includes system engineering, design/development, preparation of drawings, antenna

foundation design, civil works, supply, installation and commissioning of complete Ku-

band ground station.

The Vendor as an entity is fully responsible for supply and installation of the ‘Ku-band

remote sensing ground station' either independently or with sub vendors. NRSC invites

interested vendors to submit response to Expression of Interest (EOI) for the

establishment of Ku-band Remote Sensing Ground Station. The vendor is requested to

submit following:

• Expression of interest for the execution of the work

• Vendor details as per table 12-1.

• Compliance of understanding the REoI document

• Detailed technical proposal

• Bill of material

• Budgetary proposal

• Delivery Schedules

The Supply and installation of ‘Ku-band Remote Sensing Ground Station’ will involve

(not limited to) the following minimum activities as under:

• Understanding and finalization of the requirements


SDR&ISA / NRSC 3

• Design/ Development & System Engineering

• Supply of various Hardware/ Software systems

• Site Preparation Support (Inputs in the form of details/drawings for electrical

and other requirements for installation at user site)

• Equipment Transportation to site

• Installation and Commissioning

• Documentation, User manual and Training

• Technical support/ Technology upgrades for at least ten years

• Warranty & post warranty services

• Supply of required interfacing cables of all types, waveguides, patch panel,

patch cords, coaxial connector, etc.

The project management team of NRSC will periodically review the technical,

commercial and managerial aspects of the activity.

The typical reviews will be as under:

• Preliminary Design Review

• Critical Design Review

• Factory Acceptance Tests

• Final On Site Acceptance Tests

The vendor has to provide the appropriate drawings/ details wherever NRSC System

interface is involved.


SDR&ISA / NRSC 4

3 Overall Technical Specifications

Table 3-1: Technical Specifications of Ku-band Antenna System

Sl. No PARAMETERS SPECIFICATIONS

1. Frequency Range 10.70 GHz to 12.75 GHz 2. Reflector size Minimum of 9 meter diameter, aluminum alloy 3. Feed Configuration Cassegrain, Monopulse, Receive only, Two port

4. Reflector surface accuracy Better than 0.3mm rms

5. Sub reflector surface accuracy Better than 0.05 mm

6. Polarization Linear, Simultaneous Vertical and Horizontal orient able

7. Ku-band G/T Better than 38dB/0K @ 200 Elevation over full range

8. Antenna Mount Elevation Over Azimuth

9. Type of Servo Drive Geared Servo motor with feedback

10. Operating modes Manual/ Slew / Auto track /Step Track/ Program Track

11. Azimuth Travel range 0 to 140deg Continuous See Note1

12. Elevation Travel range 0 to 90deg Continuous

13. Velocity(Azimuth & elevation

Minimum 0.050/sec Maximum 0.250/sec

14. Travel Limits

Hardware and Software Limits for 1) Azimuth CW, CCW 2) Elevation UP, DOWN 3) Polarization CW, CCW

15. Polarization Travel ± 55Deg, CW and CCW, Motorized, Remote Control and Manual Control.

16. Pointing Error(RSS Peak)

Maximum 1/5th of 3dB beam width at operational wind velocity and occasional gust

17. Tracking Error(RSS Peak)

Maximum 1/10th of 3dB beam width at operational wind velocity and occasional gust

18. Angle Display Resolution

0.001deg in Azimuth & Elevation 0.01deg for polarization

19. Feed VSWR 1.3:1 (Maximum)

20. Radiation patterns & side lobe levels As per ITU-R Rec.580-5

21. First Side Lobe Level Minimum 14dB below main lobe


SDR&ISA / NRSC 5

22. Cross polarization Isolation 33dB minimum within 1dB beam width

23. LNA System Tri-redundant configuration( 2 LNA active)

24. Input Signal for Tracking

1) Beacon Signal The Beacon tracking receiver to work in AFC mode for this input tracking signal.

2) Wide band QPSK modulated carrier. 25. L-band IF frequency 950MHz – 1750 MHz

26. Spurious @ receive IF port at nominal output power

Less than – 65dBc

27. Spurious (signal independent) Less than -75 dBc

28. Modulation Type BPSK/QPSK/OQPSK/8PSK with convolution coding FEC 7/8 and RS(255,239) decoder

29. Data rate Minimum 220Mbps Option1: 250 Mbps Max Option 2 320 Mbps Max

30. BER Performance 1.0 x 10-8 at 7dB Eb/N0 31. Monitoring & Control Local/Remote (Ethernet with TCP/IP Protocol) 32. Pressurization 9 to 30 g/cm2, Nominal

33. Pressurization Leakage rate

200cc / Hour, Max

34. wind Velocity Operational: 70kmph, Min Survival (on stow): 200Kmph, Min

Vendor can suggest latest technologies to achieve better performance in their quotes.

NOTE1: If required, in future, any azimuth angle should be settable from the initial angle to

point to the other satellite at any of the orbital slots ranging from 480E to 115

0E and an

inclination of ± 5 deg, without disturbing the pedestal.


SDR&ISA / NRSC 6

4 System Description

The required Ku-band ground station shall have G/T of 38dB/0K and its configuration is

shown in Figure 4.1. The diameter of the antenna can be between 9 to 11 Meters with

cassegrain configuration. The feed also should have the capability for polarization

adjustment. The signal is received by the Antenna after low noise amplification; it is

down converted to 720 MHz IF. All the specifications mentioned in Table-3.1 should

meet the Ku-band frequency range of 10.70 GHz to 12.75 GHz. Vendor can suggest latest

technologies to achieve better performance in their quotes. The FO links chosen for IF

data transfer is of single mode fibre with sufficient band width to support complete Ku-

band range.

The GISAT configuration does not have On-board beacon, vendor has to suggest

alternative to beacon tracking apart from Monopulse auto track as requested by NRSC.

The proposed servo system should have auto tracking capability in Ku band. As the

antenna beam width for Ku band is relatively small when compared to X-band, it is

essential to maintain the pointing accuracy within one fifth of the beam width in order to

receive maximum signal without any loss. The antenna system to withstand to heavy

winds, earth quakes, against vibrations etc. The control system along with drive units

has to be planned in the pedestal room along with necessary test equipment.

The required antenna system should consists of following:

� Ku band Antenna & feed system.

� Ku band down converter.

� Tracking receiver

� High Data rate Demodulator

� Antenna Control unit

� Antenna Motor and Drive System

� Elevation over Azimuth pedestal.

� Network Time Protocol (NTP) server.


SDR&ISA / NRSC 7

Ku-band

Antenna &

feed system

Ku-band

Down

Converter

High data

rate

Demodulator

Tracking

Receiver

Antenna

Control Unit

Motor &

Drive System NTP Server

FO Link

Figure 4-1: Ku-band antenna system


SDR&ISA / NRSC 8

5 RF Systems RF Systems comprises of Antenna feed, feed electronics, down converters, tracking

receivers etc.

The Antenna system shall have main reflector in parabola shape and sub reflector in

hyperbola shape and feed in Cassegrain configuration. The required G/T of 38dB/0K

has to be demonstrated at 200 Elevation. A low noise amplifier with best possible Gain

and Noise temperature has to be proposed to keep the diameter close to 9 Meters. The

feed also should support mono pulse auto track configuration.

Data and tracking signals from feed ports shall be down converted from Ku band to

720MHz IF using single/two stage down conversion. All the up-down converters should

have built in synthesizes to program LO frequency. The sub systems can be placed

near to the feed to reduce the cable loss from feed to pedestal room. First Data down

converter outputs from pedestal are driven through fibre optic link to the control room.

Independent FO links are required for RF and Tracking. Second Data down converter

will be placed in control room. The IF signals is demodulated and decoded for data

ingestion and further processing. Vendor can also offer the other solution which takes L

band input directly without the second down converter (L-band to 720 MHz).

The beacon tracking not possible to track GISAT, as On-board beacon is not available.

So an alternate tracking mechanisms have to be proposed by the vendor to meet the

real-time tracking requirements apart from Step tracking.


SDR&ISA / NRSC 9

6 Antenna Control Servo Systems

ACSS should have access both from the control room and antenna pedestal room. The

real-time operations are supported from the control room and Antenna maintenance

activities will be carried out at pedestal room. All the sub systems should have Ethernet

interface with TCP/IP support. Encoder & limit switch assembly should use precision

gearing mechanism with anti backlash facility, directly fixed to SRB with hollow shaft as

main encoder along with redundant encoder. The resolution of encoder should be 22

bits or better.

Table 6-1: ACSS Specifications

SL NO Parameter Description

1. Position display Resolution 0.001 deg or better

2. Programmable control

parameters

PID / LQG control gains and torque bias for

single/ dual drive configurations.

3. Position loop bandwidth 0.1 to 1.0 Hz typically Field programmable for

BW for single/ dual drive configurations.

4. Rate loop bandwidth 5.0 to 10.0 Hz Field programmable for single/

dual drive configurations.

5. Operating modes

Standby, Ready, Slew, Manual, Program,

Designate, Ku-Auto, Step, Sun/Star, Slave

modes.

6. Type of control system Type II Closed loop position control

7. Drive configuration Two motor Counter-torque (Torque bias)

8. Type of Motor Brushless AC servo motor with resolver

feedback and built in brake.

9. Type of Drive Space vector PWM drive compatible to above

motor

10. Digital Controller

Advanced controllers can be explored in

addition to PID and feed forward control

schemes.

Antenna Control Unit

Servo Controller must be a software configurable digital controller for implementing

precision closed loop servo control system for two axes. It must implement the functions

of Position loop through position feedback and torque bias function.


SDR&ISA / NRSC 10

Table 6-2: ACU Specifications

SL No Parameter Value

1. Tracking modes Program Track,

Ku band Auto track

2. Manual Modes Standby, Manual, step, Slew, Stow, Designate & command

angle

3. Axes supported Azimuth, Elevation

4. Digital I/O channel 48 opto isolated

5. Analog – Digital

channels

12 channels with ± 10 Volts differential input and 16 bit

output

6. Digital – Analog

channel 10 channels with 16 bit input and ± 10 Volts output

Required features of ACU are:

• Software Configurable servo loops

• Real time data logging, fault indication and event logging

• Provision to give offsets to Azimuth, elevation and time during Real time

• Polarization control

• Time Synchronization to be better than 500 micro seconds

• Programmable Software and Hardware limits

• Self test diagnostic tools for all sub systems

• Antenna brake Protection circuit.

• safety limits and Interlocks

The antenna control software should have the capability track the satellite in real-time in

Auto track / step track / program track mode. The required functions of the Antenna

Control software are

• GUI to display the station configuration

• Positioning the antenna to satellite lookup angles

• Automatic configuration of the sub systems

• Control system software tools for modeling, estimation & compensation of

systematic errors of Antenna mount, Antenna droop etc.,

• Dynamic friction compensation

• Real time monitoring and data logging


SDR&ISA / NRSC 11

• Implementing different tracking modes

• Implementing different acquisition modes

• Utilities to carryout different servo tests like velocity and acceleration tests,

gradient measurements, S curve, step response etc.

• Data logger to monitor and log different engineering parameters of ACSS

system.

• Display of safety limits and Interlocks

• Utilities to track Sun/Star

Antenna Motor & Drive System

Digital Drive Amplifiers must be high efficient 3 phase Space Vector PWM IGBT based

power amplifier to drive the brushless AC servo motor. There are total four power

amplifiers each axis will have two power amplifiers. Servo Controller with built in power

supply and Ethernet interface for configuration, control & monitoring of current, velocity,

fault & status indication. Suitable drive amplifier with the following features is required.

• Integrated Power Supply and controller with all the protection circuits.

• Dynamic brake facility.

• Configurable for Velocity / Torque modes

• Programmable control parameters

• Potential free contacts for interlocking the drive amplifier.

• Resolver/encoder interface

• Ethernet interface for remote monitoring & control

• Provision for monitoring current, faults, status etc.,

• Protection features


SDR&ISA / NRSC 12

7 Mechanical Systems

Antenna Mount

The antenna required be mounted on Elevation over Azimuth drive Pedestal with

steerability of 0 to 90 deg in Elevation and 0 to 140 Deg in Azimuth in Continuous

mode to enable pointing the antenna to any GEO satellite. The Rigidity of the

mount, reflector & foundation should be able to provide the required pointing &

Tracking accuracies.

Mechanical considerations for Antenna Design

Following main factors have to be taken into account while designing the Structural and

mechanical elements of Antenna Reflector and Mount:

1. The 2 axes Antenna mount supporting structure shall be used for above assembly.

2. Axis Alignment i.e. Orthogonality between Azimuth and elevation axis.

3. Structural deformation due to wind, Temperature and gravity. The reflector back up

structure needs to be strengthened.

4. Minimum Gear backlash, less thermal deformation of reflector and encoder

alignment directly to the axis shaft to achieve the overall pointing accuracy.

5. Precise fabrication of mechanical components from reputable suppliers with proper

attention to stiffness of reducers, individual component testing and tight quality

control over tolerances specified.

6. Vendor shall be considered materials like oxygen free copper for the fabrication of

feed components.

7. The antenna pointing also depend upon precision structure that provide structural

stiffness in wind and low thermal effects, proper mechanical alignments of critical

components which requires care and skill during field installation.


SDR&ISA / NRSC 13

8. The geometrical optics of the reflector – sub-reflector and feed alignment.

9. Antenna focusing – antenna focus alignment is very sensitive. Photogrammetric

and computer aided algorithm techniques are to be adopted for the antenna

alignment process along with skilled and experienced technician.

10. Total Antenna Error budget for pointing error has to be made and listed. The

overall pointing error should be less than the specified specifications.

11. The parameters considered for the pointing error should include all the systematic

and random errors.

12. The pedestal errors have to be made bare minimum with optimum design and high

precision machining and quality control.

13. Due to high pointing accuracy requirement, high precision fabrication of

mechanical components and sub-assemblies are to be carried. Stringent tolerance

specifications are to be made, measured and accounted properly.

14. Thermal protection and custom built high precision bearings (SRB) can be

explored. High precision Slew Ring Bearings with low bearing wobble are to be

chosen.


SDR&ISA / NRSC 14

8 Reliability & QA requirements The operational life of the complete earth station system (including drive, bearings and

other moving parts of the antenna & control system) is expected to be of at least 15

years. The earth station will be operational 24x7 in automatic mode/remote control

mode. Vendor has to suggest the list of spares required for the proposed system .The

redundancy required in all the subsystems shall be provided by the vendor. Electrical

and mechanical characteristics of proposed reception system shall comply with the (EIA

standard) EIA-411-A document. The station will be operating under controlled

environment. However the equipment used shall have the capability to the following

environmental condition.

Table 8-1: Indoor Unit Environmental Specifications

SL NO Parameter Value

1. Operating temperature 00C to +50

0 C

2. Storage temperature -100C to +65

0 C

3. Humidity 80% RH non condensing

Table 8-2: Outdoor Unit Environmental Specifications

SL NO Parameter Value

1. Operating temperature 00C to +60

0 C

2. Storage temperature -100C to +65

0 C

3. Humidity 95% RH @ 400 C with condensation

4. Rain >=50mm/Hr

5. Wind Speed

Operational

Occasional gusting

Drive to Stow

Survival to Stow

70 KMPH

80 KMPH

100 KMPH

200 KMPH


SDR&ISA / NRSC 15

9 Delivery Schedule

Vendor has to provide delivery schedules with major milestones like design reviews,

installation, Factory Acceptance Test etc.

10 System Installation & Integration

The vendor shall be responsible for installation and commissioning of the Ku-band

reception system at NRSC locations. Vendor should demonstrate its functionality in its

full configuration at user site for final acceptance. Final acceptance of the system will be

done only after installation at user site in its full configuration.

11 Acceptance Test plan

The system will undergo the acceptance tests as per the mutually agreed test plans at

the vendor’s site (factory acceptance test) as well as at the installation site (site

acceptance test) and user validation. The vendor will be responsible to arrange the tests

in the presence of NRSC engineers. The tests may be as per the sequence given below

with a detailed test plan and will be finalized latter.

• Subsystem level tests at Vendor’s/Manufacturer’s premises

• Sub system level test at user site after receipt of the systems

• Testing of antenna control and tacking system.

• Testing with complete antenna systems

• Simulation checks

• Testing of the earth station with spacecraft

• Final acceptance test plan as per NRSC laid down procedures


SDR&ISA / NRSC 16

12 Vendor details

The prospective vendors should submit full details of their technical competence for

undertaking project of this nature, in the technical part of their proposal document. A

preferable format (not limited to) is provided in the following Table 12-1.

Table 12-1: Vendor details

SL NO Description Details

1. Year Of Establishment

2. Vendor’s Area Of Core Competence

3. Infrastructure details (Area, facilities, manpower

etc.,)

4. Annual turnover in the last two financial years

5. Vendor should necessarily have the experience in

establishing satellite data reception systems

(LEO/GEO)

6. Details of the similar orders executed along with

end user address

7. Quality Management system (QMS) certification

8. Willingness to provide Non-Disclosure Agreement,

Confidential agreement on NRSC shared

information.


SDR&ISA / NRSC 17

NOTICE OF INTENT TO PRE-BID

REoI Title: Supply, Installation and Commissioning of Ku-band Ground station for

GEO imaging satellite

Vendors must complete and return this form to NRSC/ISRO. The undersigned person

has read all EoI instructions and requirements and will submit a proposal in compliance

with those instructions. Return this form to the name and address listed in this

document.

Company Name:

Name:

Title:

Address:

Telephone:

Fax:

Email:

Website:

Signature: Date:


SDR&ISA / NRSC 18

Contact persons for any technical clarification

1. Group Head, STSG

National Remote Sensing Centre (NRSC), ISRO, Hyderabad-500625 Telephone: 23884296 Email: [email protected]

2. Group Head, SDSG

National Remote Sensing Centre (NRSC), ISRO, Hyderabad-500625 Telephone: 23884336 Email: [email protected]

3. Deputy Director, SDAPSA

National Remote Sensing Centre (NRSC), ISRO, Hyderabad-500625 Telephone: 2388 4434 Email: [email protected]

For further commercial information 4. Head, Purchase & Stores

National Remote Sensing Centre (NRSC), ISRO, Hyderabad-500625 Telephone: 2388 4072 Email: [email protected]

REOI FOR KU-BAND GROUND STATION FOR GISAT -EOI-001.pdf · March, 2015 REOI FOR KU-BAND GROUND...

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