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How to Implement Inter satellite Optical communication in OMNeT++

To implement the inter-satellite optical communication (ISOC) in OMNeT++, we have to simulate the interaction amongst satellites with the help of optical links instead of out-dated RF (Radio Frequency) links. It provides advantages such as higher data rates, lower power consumption and better security.

Below is a guide on how to implement ISOC in OMNeT++ with examples.

Steps to Implement Inter-Satellite Optical Communication (ISOC) in OMNeT++

  1. Set Up OMNeT++ Environment:
    • Make certain that you have OMNeT++ installed and configured, associated with any essential frameworks like INET or custom modules for optical communication.
  2. Design the Network Architecture:
    • Develop a constellation of satellites that will communicate with one another using optical links.
    • Generate a network topology that has the satellites, optical transceivers, and the links connecting them.
  3. Develop or Extend the Optical Communication Model:
    • If INET or other OMNeT++ frameworks do not contain optical communication modules, you may need to build or extend existing ones.
    • Execute models for optical transceivers that manage laser-based communication, considering parameters like wavelength, beam divergence, and pointing precision.
    • State optical channels that mimics free-space optical links, consider factors like atmospheric conditions (if applicable), alignment issues, and power budget.
  4. Configure the Inter-Satellite Links:
    • Define communication parameters involves data rate, link distance, and error rates particular to optical communication.
    • Execute line-of-sight (LOS) computation to make certain that optical links are accomplished only when satellites are in each other’s field of view.
  5. Develop Communication Protocols:
    • Implement or adapt existing communication protocols to handle the optical links, focusing on accomplishing and upholding the link, handling errors, and routing data amongst satellites.
    • Consider executing a handover mechanism to switch to RF links if the optical link is obstructed or fails.
  6. Run Simulations:
    • Implement simulations with various configurations to assess the performance of the ISOC system.
    • Gather metrics like throughput, latency, bit error rate, and link availability.
  7. Analyze and Visualize Results:
    • Use OMNeT++’s analysis tools to assess the performance of the ISOC implementation.
    • Visualize the optical links and the communication amongst satellites to better understand the actions of the network.

Example Configuration

Here’s a simple example of configuring inter-satellite optical communication in OMNeT++:

network = ISOCNetwork

sim-time-limit = 200s

[Config ISOCNetwork]

*.numSatellites = 3

*.satellite[0].type = “OpticalSatellite”

*.satellite[1].type = “OpticalSatellite”

*.satellite[2].type = “OpticalSatellite”

*.satellite[0].mobility.x = 1000km

*.satellite[0].mobility.y = 2000km

*.satellite[1].mobility.x = 3000km

*.satellite[1].mobility.y = 4000km

*.satellite[2].mobility.x = 5000km

*.satellite[2].mobility.y = 6000km

*.satellite[0].opticalTransmitter.power = 1.0W

*.satellite[1].opticalTransmitter.power = 1.0W

*.satellite[2].opticalTransmitter.power = 1.0W

*.satellite[0].opticalReceiver.sensitivity = -40dBm

*.satellite[1].opticalReceiver.sensitivity = -40dBm

*.satellite[2].opticalReceiver.sensitivity = -40dBm

# Define the optical links between satellites

connections = [

{ srcNode = “satellite[0]”, destNode = “satellite[1]”, channelType = “OpticalChannel” },

{ srcNode = “satellite[1]”, destNode = “satellite[2]”, channelType = “OpticalChannel” },

{ srcNode = “satellite[2]”, destNode = “satellite[0]”, channelType = “OpticalChannel” }

]

Example Scenario

  1. Scenario 1: High-Speed Data Transfer
    Replicate high-speed data transfer amidst satellites using optical links. Evaluate the impact of distance and pointing precision on the data rate and error rate.
  2. Scenario 2: Link Handover
    Implement a scenario where the optical link fails because of misalignment or obstruction, accelerating a handover to a backup RF link. Estimate the time taken to switch and the influence on data transmission.

Considerations:

  • Optical Channel Modeling: Pay close attention to modeling the optical channel, taking into account factors like beam divergence, pointing accuracy, and link budget. You might need to execute custom models if available ones don’t fully help optical communication.
  • Mobility and LOS: Implement dynamic LOS calculations depend on the movement of satellites to make sure proper link establishment and maintenance.
  • Integration with Existing Protocols: Incorporate ISOC with existing routing and MAC protocols, adapting them to manage the distinct contests of optical communication like the need for precise alignment and potential link obstructions.

In conclusion, we collect the necessary information and brief the implementation process of Inter Satellite Optical Communication in OMNeT++ and INET framework by extending the existing models and setting up links amongst satellites. For future enhancements, you can execute LOS computation or model the channels as needed.

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