Ka Ingenious Space Solution (KISS) - Payload Studies HDTV mission / MMDIA mission / Operational constraints IOT & Harness improvement

Objectives

The objective of the MultiMeDIA study was
To define a typical mission requiring high density locally for TV conjointly with a mission ‘s large coverage. This study enhances ability to deal with irregular meshing and specific adequacy between high capacity of service and scope of the satellite.
The study suggested
1.   Technics and reference mission for preparing futur proposal to customer
2.   To define with system study the main drivers to highligth the Payload architecture
3.  To anticipate neighboring hardwares (antenna, converters, harness…) with long lead time developments
    
The objective of the MultiMeDIA study was: 
To define a typical mission requiring high density over large coverage for internet and conjointly with a mission ‘s large coverage. This study enhances ability to deal with irregular and regular meshing, by means of huge quantity of spots, and specific adequacy between high capacity of service and scope of the satellite.
The study suggested
1.   Technics and reference mission for preparing futur proposal to customer
2.   To define with system study the main drivers to highligth the Payload architecture
3.     To anticipate neighboring hardwares (antenna, converters, harness…) with long lead time developments
4.     To orient development of hardwares to reduce footprint and mass
 
The objective of the IOT study was: 
To improve technics and fastness for testing multiple beams configuration related to HDTV and MMDIA mission. 
 
The objective of the harness study was: 
To reduce the harness mass and improve the harness competitiveness. On multi-beam Ka band mission the mass of the harness represents an important part of the repeater mass, and it has to be optimized as it is for the equipment mass in order to provide an optimized payload mass.

Challenges

 For the HDTV mission, the key issues were:

  • To define the best definition of frequency resources (spots, spot size, capacity per DMA…)
  • To cope with high power constraints (dissipation, hardware qualification…)
  • To accommodate the platform (quantity of hardware and waveguide)
  • To accommodate antennas related to large reflector
  • To finalise the best definition of antenna gain in case of various combination of spot size
  • To improve flexibility vs. EIRP and C/(I+N) over the coverage
For the MMDIA mission, the key issues were:
  • To define the need with respect to real opportunity from the market
  •  The best definition of frequency resources (spots, spot size, capacity per beam…)
  • To cope with significant frequency bandwidth (dissipation, hardware qualification…)
  • To accommodate a huge quantity of hardware and waveguide
  • To accommodate antennas related to large reflector
  • The best definition of antenna gain in case of various combination of spot size
  • To make applications reusable for the first opportunity
Operational constraints IOT key issues were:
  • Propose a significant time saving without shadowing performances of the payload
For the harness improvement, the key issue were:
  • To reduce the size of the WR51 flange, this taking care of the EMC performance. A good compromise had to be found between the number and type of screws and the targeted EMC performance.
  • To reduce the mass of the waveguide support through optimisation or use of multi-waveguide support, which is also an issue to save mass
  • To reduce the mass of the waveguide support through the use of new materials
  • To Optimize the panel fixing to reduce the mass

Benefits

The main benefit expected for HDTV mission was:
System analysis based on main drivers to be privileged.
Antenna development in connection with multiple beams (sources, reflector...).
Better understanding of beam allocation for multispot application.
Better awareness of power increase as a driver for future platform.
Hardware development and multiple trade off associated with for reducing both footprint and mass:
  • High power TWTA 
  • OMUX with high power constraint
  • Converter 25/17GHz
  • Cmd receiver 25GHz
The main benefit expected for MMDIA mission was:
Antenna development in connection with multiple beams (sources, reflector...).
Hardware development and multiple trade off associated with for reducing both footprint and mass:
  • Converter assembly with flexible use
  • CMUX assembly 
  • Wide bandwidth for Channel amplifier use
Trade of between capacity vs. power consumption and dissipation.
Trade of between capacity vs. quantity of hardware.
Better awareness of power increase as a driver for future platform.
 
The main benefit expected for IOT constraints was:
Development of faster test set up.
Deepening of real venting need for Payload and new method of outgassing process.
 
The main benefit expected for harness was:
The main benefit expected for the harness improvement work-package is the reduction of the harness mass and also potentially an increase of the harness competitiveness.

Features

Features of HDTV mission were:
One way link from Gateway to users.
Service areas: USA.
Type of coverage: National shaped and regional beam covering as required by the Design Market Analysis.
Regional beam/national: Irregular meshing beam ranging from phi 0.4-0.5-0.7°/CONUS coverage.
USA Frequency plan: Rx: 24.75-25.25 GHz / Tx: 17.3-17.8GHz.
 
Features of MMDIA mission were:
Features of the mission are parametrics because of flexible possible configurations and conjoint developments attached to them.
Based on both four antennas and a population equally distributed, a regular meshing here below can be considerd:
 
98 beams with phi 0.4°
79 beams with phi 0.45°
64 beams with phi 0.5°
60 beams with phi 0.55°
48 beams with phi 0.6°
 
Other parametric considerations were:
  • Regular and irregular meshing
  • Mono or dual polarisation
  • Frequency bandwidth per spot of 125 MHz and 250 MHz.
  • Quantity of gateway versus the capacity
  • Adequacy between capacity and quantity of hardware
All other characteristics were selected on state of the art commonly recognized by customers.
 
Features of operational constraints IOT were:
Multiple beams configuration as per MMDIA capacity.
To make a compromise between complexity of the payload with repetitive patterns and campaign duration of IOT testing.
 
Features of harness were:
The Harness improvement did address waveguide flange, brackets, new material and bracket to panel fixing. The main goal being to reduce the harness mass.

Plan

The HDTV mission development logic was:
  1. Definition of the system team on the most promising mission in connection with the study.
  2. Identification of main drivers by means of system analysis related to selected mission.
  3. Identification of potential difficulties to technologies.
  4. Orientation of development of new hardware.
  5. Trade-off in terms of performances, cost and schedule (accordingly short and long term application). Selection of the most promising processes and techniques.
  6. Technics for architecture implementation.
  7. Design consolidation of new hardware.
  8. Manufacturing.
  9. Validation/Qualification of selected solutions.
The MMDIA mission development logic was:
  1. Definition of the system team on the most promising mission in connection with the study.
  2. Identification of main drivers by means of system analysis related to selected mission.
  3. Identification of potential difficulties to technologies.
  4. Orientation of development of new hardware.
  5. Trade-off in terms of performances, cost and schedule (accordingly short and long term application). Selection of the most promising processes and techniques.
  6. Technics for architecture implementation.
  7. Design consolidation of new hardware.
  8. Manufacturing.
  9. Validation/Qualification of selected solutions.
Operational constraints IOT development logic was:
  1. Identification of potential angles to reduce testing time.
  2. Orientation of new test set up‘s development to meet objective.
  3. Trade-off in terms of performances, cost and schedule (accordingly short and long term application). Selection of the most promising processes and techniques.
The Harness development logic was:
  1. Identification of potential candidate technologies and suppliers if needed.
  2. Trade-off in terms of performances, cost and schedule (accordingly short and long term application). Selection of the most promising processes and techniques.
  3. Design consolidation.
  4. Manufacturing.
  5. Validation/Qualification of selected solutions.

Current status

HDTV mission

TWTA 170 W and high power OMUX were qualified.
Multiple side effects on proposal emerging for future multiple beams.
 
MMDIA mission 
Successful qualification of CMUX.
Redirected converter assembly configuration based on initial work package.
Finalisation of neighboring work package in connection Multi MeDIA mission.
Multiple side effects on proposal emerging for future multiple beams.
 
Operational constraints IOT
Applicable method on current In Orbit test.
 
Harness improvement:
  • For the WR51 flange, a mass saving of 44% has been reached and improvement are also valid for the WR34 flange with 39% saving. New flanges are qualified.
  • For Ka band multisupport waveguide, a saving of 61% has been reached.
  • Also new materials have been identified as promising for Ka band support waveguide.
  • New panel fixing solutions have been designed to reduce the mass and will have to be qualified.
=> As a whole, 10% mass saving on harness is expected through this work-package. Thus this package has been very successful.

Contacts

Status date

Tuesday, March 21, 2017 - 11:42