Top 20 AWS Ground Station Interview Questions and Answers

Customers may simply command, control, and downlink data from satellites using Amazon Ground Station, a fully managed service. You can arrange minute-by-minute access to AWS Ground Station antennas and only pay for the time you really use them. You can receive data from the satellite via AWS Ground Station, keep track of its condition, and send commands to modify its activities. AWS services such as Amazon S3 or Amazon EC2 can be used to store or process incoming data once it has been streamed there.

Ques. 1): AWS Ground Station: What is it?

Answer:

You can manage satellite communications, process data, and grow your operations with the help of Amazon Ground Station, a fully managed service, all without having to construct or maintain your own ground station equipment. Weather forecasting, surface photography, communications, and video broadcasting are just a few of the many applications that satellites are employed for. The foundation of all satellite networks are ground stations. You have immediate access to AWS services through AWS Ground Station, as well as the Amazon Global Infrastructure, which includes a low-latency international fibre network.

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Ques. 2): What is the procedure for using AWS Ground Station?

Answer:

Go to the AWS Ground Station console in the AWS Management Console to get going. Here, you choose the satellites with which you must communicate and set up "Contacts" with them. A chosen satellite, the start and end times, and the ground location make up each contact. Up to 15 minutes before the scheduled contact time, you can cancel or reschedule by reviewing confirmed Contact times in your console. Use the AWS Ground Station EC2 AMI to run EC2 instances that will uplink and downlink data during the contact or that will receive downlinked data in an Amazon S3 bucket after the contact has been scheduled. Depending on your mission, you could require Downlink instances to receive bulk mission data from the satellite and Command instances to receive operational telemetry from the satellite and communicate modifications to the satellite's scheduled future actions. Throughout the duration of the contact, these instances will communicate with the AWS Ground Station aerial gateway via an ENI connection that already exists between them and the satellite aerial.

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Ques. 3): What kinds of satellites are capable of communication with AWS Ground Station?

Answer:

Non-Geostationary Earth Orbit (NGSO), Low Earth Orbit (LEO), and Medium Earth Orbit (MEO).

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Ques. 4): How does AWS Ground Station interact with and complement other AWS offerings?

Answer:

Processing and storing satellite-derived data using AWS Ground Station is simple, whether in the AWS area closest to each AWS Ground Station antenna or in another AWS region (using Amazon's global backbone network). Amazon Elastic Block Store (EBS), Amazon Elastic File System (EFS), and Amazon S3 are all options for local data storage on EC2 instances. You may set up lifecycle policies in S3 to automatically move older, less-used data to cheaper storage classes, such as Amazon Glacier and S3 Infrequent Access.

To fully control data input and offer standard APIs for integrating data analysis into your apps, use Amazon Kinesis Data Streams. With its seamless interaction with Amazon Rekognition, items may be recognised automatically (such as cars or airplanes). You may create unique machine learning programmes that use your data by using Amazon SageMaker.

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Ques. 5): When will I be billed for my use of the ground station?

Answer:

Upon the conclusion of each communication, customers will be charged. Clients will receive a charge for their commitment to Reserved Minutes plus any On Demand minutes used that month on their monthly AWS payment.

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Ques. 6): What operational broadcast and receive frequencies can be used by the ground station?

Answer:

The following frequencies can be supported by current ground station antenna systems:

Between 2025 to 2120 MHz, the S-Band transmits

S-band reception between 2200 and 2300 MHz

X-band reception between 7750 and 8400 MHz

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Ques. 7): What are the AWS Ground Station's main advantages?

Answer:

The first satellite Ground Station as a Service in the industry, AWS Ground Station is part of the AWS Global Infrastructure footprint and provides elastic, on-demand access to ground station satellite antennas without commitment. Previously, building ground stations for these connections required substantial capital expenditures, including the price of servers and storage needed to analyse incoming data. This makes it more difficult for you to react quickly to new business opportunities or important occurrences (such large weather events) and necessitates the operation and upkeep of a vast ground antenna network. AWS controls the ground station infrastructure with AWS Ground Station, allowing you to concentrate on developing and quickly testing new applications that process, analyse, and distribute satellite data. With Amazon's global, high-capacity backbone network, you can simply link this data with other AWS services, whether they are located in the same region or a different AWS Region.

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Ques. 8): What occurs when the time for my scheduled Contact arrives?

Answer:

Use the Amazon EC2 AMI to launch the necessary instances to interact with the satellite before the specified contact time, or construct an Amazon S3 bucket to receive downlinked data. Your EC2 instances will have the ability to connect to the AWS Ground Station antenna gateway over an ENI connection right before the scheduled encounter. Your EC2 instances will start sending and receiving data from the satellite as soon as the interaction starts. The data will be transmitted to your Amazon S3 bucket without the requirement for a Downlink instance if you want to receive downlinked data to an Amazon S3 bucket.

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Ques. 9): How can AWS Ground Station ensure that my satellite is not being controlled by someone else?

Answer:

To prevent unauthorised contact with satellites, AWS Ground Station employs a variety of security procedures. AWS onboards, identifies, and correlates the satellite and satellite owner with a selected customer account before permitting initial contact with a satellite. The user can then schedule satellite contacts using that account with AWS Ground Station or give permission for other AWS accounts to do so. For the duration of the contract, only authorised EC2 instances are permitted access to the AWS Ground Station aerial gateway. The encryption keys required to approve and encrypt data sent to the satellite are entirely under the control of the customers. Amazon S3 data is written to their Amazon S3 bucket and stored using Server Side Encryption (SSE).

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Ques. 10): When will I be billed for my use of the ground station?

Answer:

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Ques. 11): Is it possible to arrange time on an aerial in one location—say, Oregon—while working from another—say, Sydney?

Answer:

Indeed, AWS Ground Station is a network of aerial systems that spans the globe and is accessible to users anywhere. In fact, scheduling time on antennas at each point in the global network will be routine practise for many users.

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Ques. 12): What happens if the Contact I sought is unable to be reserved?

Answer:

If your preferred Contact is unavailable (for instance, because there are already bookings in place for aerial time at the selected site), the AWS Ground Station Management Console will present alternate contacts for your consideration.

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Ques. 13): How far in advance may Contacts be scheduled?

Answer:

Reservations for Reserved Minute Contacts can be made up to 21 days in advance, and they can be changed up to 1 day before the original appointment. On demand contacts cannot be rescheduled and can be scheduled up to 7 days in advance as well as as little as 15 minutes.

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Ques. 14): Where are the antennas for Ground Stations located?

Answer:

The service is being extended by AWS Ground Station to more AWS Regions and places worldwide.

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Ques. 15): How can the AWS Ground Station connect with satellites using radio frequencies or bands?

Answer:

S- and X- frequency bands, among others, can be used by AWS Ground Station antennas to communicate with satellites.

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Ques. 16): How do contacts work?

Answer:

A Contact is a reserved time slot for communication with a particular satellite from a known terrestrial location.

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Ques. 17): What happens if I make a contact but later decide I need to cancel it?

Answer:

Customers with reserved minutes are free to end contacts up to 24 hours before they begin without incurring any fees or penalties. Customers that use Reserved Minutes must pay a cancellation fee equal to the contact's cost if they need to cancel a contact less than 24 hours before the contact's start time. Customers using On Demand may cancel contacts up to 15 minutes before the start of the contact for a fee equivalent to the cost of the contact.

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Ques. 18): How fast is AWS Ground Station?

Answer:

Narrowband uplink rates of up to 54 MHz and downlink speeds of up to 500 MHz are supported by AWS Ground Station.

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Top 20 AWS CodePipeline Interview Questions and Answers

Model, visualise, and automate the steps necessary to deploy your product with AWS CodePipeline, a continuous delivery service. You can model the entire release process for creating your code, deploying it to test environments, testing your application, and releasing it to production with AWS CodePipeline. Every time there is a code change, AWS CodePipeline then builds, tests, and deploys your application in accordance with the specified workflow. An end-to-end continuous delivery solution can be created by integrating partner technologies and your own unique tools into any stage of the release process.

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Ques. 1): What makes AWS CodePipeline a good choice?

Answer:

You can speed up and improve the quality of your software updates by automating your build, test, and release processes with AWS CodePipeline. This is done by subjecting all fresh changes to a standardised set of quality tests.

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Ques. 2): Describe an artefact.

Answer:

A file or set of files are affected when an action is executed. These documents are known as artefacts. Further steps in the pipeline can work on these items. For instance, a build action will read in a source artefact that contains the most recent version of the code that was output by a source action. The build action will upload the build output after compilation so that it can be read by the later deployment activities.

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Ques. 3): How would I begin a pipeline?

Answer:

When you build a pipeline, it will immediately start a run to publish the most recent version of your source code. After then, a fresh run is started each time your source location is modified. Moreover, you can use the Release Change button in the pipeline console to re-run the most recent revision through the pipeline.

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Ques. 4): How can I use AWS Lambda functions and serverless applications to practise continuous delivery?

Answer:

By integrating the AWS Serverless Application Model template and its accompanying files in your source code repository, you can publish modifications to your serverless application. To package your code for distribution, you can utilise AWS CodeBuild in your pipeline. Afterwards, you may develop a change set and launch your serverless application using AWS CloudFormation activities. You have the choice to add more phases to your workflow, such as automated tests or manual approvals.

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Ques. 5): What products can be integrated with AWS CodePipeline?

Answer:

AWS Elastic Beanstalk, AWS CloudFormation, AWS OpsWorks, Amazon ECS, and AWS Lambda are just a few of the AWS services that AWS CodePipeline connects with. AWS CodePipeline also incorporates with a variety of partner products. Finally, CodePipeline allows you to integrate any existing tool and create your own unique actions.

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Ques. 6): Can I allow an IAM user in a different Amazon account to access the pipeline in a different AWS account?

Answer:

Yes. To grant access to the pipeline and any associated resources to an IAM user in another account, you can create an IAM role in the AWS account that owns the pipeline. See Walkthrough: Delegating Access Across AWS Accounts For Accounts You Own Using IAM Roles and Setup Cross-Account Access to a Pipeline for instructions on how to enable such cross account access.

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Ques. 7): What is continuous delivery?

Answer:

A software development method known as "continuous delivery" involves automatically building, testing, and getting code updates ready for production release. You can use AWS CodePipeline as a service to carry out continuous delivery.

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Ques. 8): An transition is what?

Answer:

In the AWS CodePipeline console, the arrows that connect the stages of a pipeline are transitions. The transition arrow represents the automatic sending of revisions to the following stage once they have successfully completed the actions in a stage. Between phases, transitions may be blocked or enabled.

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Ques. 9): Is it possible to duplicate an existing pipeline?

Answer:

Yes. To obtain the JSON structure of your current pipeline, use the Amazon CLI command get-pipeline. Then, you can create a new pipeline with the exact same structure as the previous one using that JSON and the create-pipeline Amazon CLI command.

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Ques. 10): How do I use a release workflow process to provision and manage my AWS resources?

Answer:

You can use continuous delivery to automatically build and test modifications to your AWS CloudFormation stacks before promoting them to production stacks using AWS CodePipeline and AWS CloudFormation. You may quickly and dependably make changes to your Amazon infrastructure using this release method. You can add more actions to your workflow, such as manual approvals, test actions, or the execution of Amazon Lambda functions.

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Ques. 11): How can I set up and administer my AWS resources using a release workflow procedure?

Answer:

Continuous delivery enables you to automatically generate and test modifications to your AWS CloudFormation stacks prior to promoting them to production stacks using AWS CodePipeline and AWS CloudFormation. You may make changes to your AWS infrastructure quickly and reliably using this release method. You can add more steps to your workflow, such as test activities, human approvals, or calls to Amazon Lambda functions.

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Ques. 12): How can I get notified or alerted when something happens in AWS CodePipeline?

Answer:

For events that have an effect on your pipelines, you can generate notifications. Amazon SNS notifications will be used for notifications. Each notification will have a link to the resources whose event caused it, along with a status message. There is no additional price for notifications, but you can be charged for other AWS services that notifications uses, including Amazon SNS. Customers can also set up notifications to go to their Slack channels or Amazon Chime chat rooms when utilising the AWS Chatbot.

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Ques. 13): Describe a pipeline.

Answer:

A pipeline is a workflow concept that explains the release procedure for software modifications. The workflow is described using a list of phases and activities.

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Ques. 14): How can a pipeline be stopped?

Answer:

You can disable a transition from one step to another to halt a pipeline. Your pipeline will keep running revisions through the steps after it has been disabled, but revisions will not be promoted via the disabled transition to subsequent stages.

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Ques. 15): Is it possible to obtain a call log for the AWS CodePipeline API?

Answer:

Yes. Simply enable Amazon CloudTrail in the AWS Management Console to acquire a history of all AWS CodePipeline API calls made on your account for security analysis and operational troubleshooting.

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Ques. 16): How do revisions work?

Answer:

A revision is a modification made to the pipeline's specified source location. It may contain data, build output, configuration, or source code. Several revisions may be going through a pipeline at once.

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Ques. 17): Can I modify an already-built pipeline?

Answer:

Yes. You can add or delete pipeline stages as well as add, amend, or remove stage actions using the Amazon CodePipeline console or AWS CLI.

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Ques. 18): What is an action?

Answer:

An action is a procedure carried out on a revision. According on the stage design, pipeline events happen in a predetermined sequence, either serially or concurrently.

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Ques. 19): Can actions run in parallel?

Answer:

Yes. For any stage, you can set up one or more actions to run concurrently.

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Ques. 20): How can I get AWS CodePipeline up and running?

Answer:

You can start using the service by creating a pipeline after logging into the AWS Management Console.