Introduction to Radar Technology

Radar technology is fundamental in modern defense, aviation, and weather forecasting systems. It involves the use of radio waves to detect and track objects. The development of radar has evolved significantly, leading to the creation of various types, including MESA and AESA.

MESA Radar: Mechanics of Operation

MESA radars use a mechanical approach to direct their radio waves. This type of radar typically has a single antenna that rotates or moves to scan a specific area. The key characteristics of MESA radar include:

1. Scanning Method: MESA radars rely on the physical movement of the antenna to change the direction of the radar beam.
2. Beam Steering: The steering is slower due to mechanical movement.
3. Cost: Generally, MESA systems are less expensive to produce and maintain.
4. Durability: The mechanical parts can wear out, leading to maintenance and reliability issues.

Slotted Waveguide Antenna with Corporate Feed for a MESA

AESA Radar: Advanced Technology

AESA radars, on the other hand, use numerous small transmit/receive modules to electronically steer the radar beam. The main features of AESA radar include:

1. Scanning Method: AESA radars electronically steer the beam, allowing for rapid direction changes without any moving parts.
2. Beam Steering: It offers faster and more precise steering capabilities.
3. Cost: Higher production and development costs due to advanced technology.
4. Durability: Higher reliability and lower maintenance requirements as there are no moving mechanical parts.

AESA Array

Comparison and Contrast

1. Speed and Precision: AESA radars are faster and more precise in targeting due to their electronic steering capabilities, while MESA radars are slower because they rely on mechanical movement.
2. Cost and Maintenance: MESA radars are more cost-effective but require more maintenance. AESA radars, though costly, have lower maintenance needs.
3. Reliability: AESA radars are generally more reliable due to the lack of mechanical parts, which are prone to wear and tear in MESA radars.
4. Flexibility and Performance: AESA radars offer greater flexibility and performance, capable of simultaneously tracking multiple targets and performing different radar functions.

Conclusion: The Future of Radar Technology

Both MESA and AESA radars have their place in modern technology. The choice between them often depends on the specific requirements of the application, budget constraints, and performance needs. As technology advances, AESA radars are becoming increasingly prevalent due to their superior performance characteristics, although MESA radars still find use in less demanding applications where cost is a significant factor.

My father has always presented challenging opportunities with the banner “an opportunity to excel.”  I would always wonder with motivation and perturbation while waiting to find out what warranted such an ominous title.  Do our personal best practices in communication translate to all situations that we encounter or scale to an audience of any size?  Speaking to one is not the same as ten, and ten is not the same as eighty.  Presentation is not the same as teaching, but a well-delivered informative presentation may end with a non-trivial amount of time spent in instruction.  How we prepare for challenges work to define our future opportunities.

While the prospect of public speaking has not caused me to lose sleep, communication opportunities taught me more about my shortcomings than strengths.  I viewed the world of communication as one dominated by the presentation of information for persuasion.  Two opportunities brought to me within a short period of time pushed me to seek a professional perspective.  One was an audience close to one hundred conference attendees, and the other was teaching a ten-week class of approximately thirty adult students.  Confessions of a Public Speaker was one selected of around a dozen books that I seriously considered.

Author: Scott BerkunPublisher:  O’Reilly MediaEbook ISBN:978-0-596-80979-9

I have made my use case for this text, and will keep my review concise.  These items are my shortlist for recommending this book:

• The perspective comes from an author is a full-on geek when it comes to public speaking.  (He knows of what he speaks, and enjoys the occasion to do so.)
• In both abstraction and specifics, Mr. Berkun provides practical solutions for more urgent, immediate problems than I could have imagined on my own.
• How is the audience and situational coverage?  For me, comprehensive.
• Scott provides tools and techniques rather than endless lists of tips.
• The book is easily searchable for helpful information when used as a reference.

Can you recall a pair of gym shoes that you refused to throw away?  Any male reading this know what I am talking about.  For me, it conjures up memories of an old pair that were ONLY used while weight training.  These lasted almost four years.  Along the sides tears, blood stain, discoloration (sweat, drinks, gym grit, crap that bleach cannot kill, etc.), abrasions, and stretches marred them.  The bottoms were smooth and the inside lining was rent from the stitching.  What finally terminated my obsessive use of these beloved shoes?  My wife.  She could not see why I would want something that looked and smelled so objectionable.  

Once upon a time, a project began.  The engineers exuded excitement, and the project managers delighted in Gantt charts!  Part selection came with a flurry.  Resources seemed plenty.  Plans came together.  Meetings delighted with all together.  After a week went by smoothly, reality set in for all.  Have you seen this?  Rubber hits the road, and few prepare well for predicting when this happens.

Many directions split off from this framing.  However, this post focuses on one problem.  What do you do when indecision arrives?  This takes the form of selecting a design path, a tool chain, method of installation, and many others.  How do you deal with this?  The word is responsibility, and this allows for scaling at any level.

If you have a management role, this may include corralling overly exuberant engineers.  Although, this may as easily be breaking through the roadblock of those not willing to commit to a design.  First, the front-end work of building a competent team remains the critical method.  Early days in a project is better than later for a shake-up if needed.  Second, commit with a plan that you have researched.  Nobody will follow a boss/manager/leader that does not do their own research.  Be in a place to give a realistic, competent approach to follow.  Even those that may not be the final provides the team with a jump-start to review with advanced information.  Third, invest in your coworkers, and they will lookout for you.  Fourth, be honest with your leadership with methods for alternatives when you shake-up this plans.

How do you deal with this problem when you are not in a leadership role?  Hard work always help, but insight is better.  Act with ownership even when you do not own the leadership.  Your work owns the path that leads to success.  Develop your strategies, and show the merits.  One word of warning in this is to know the difference between being sure of the necessary path and that which is about ego.  When the company is worth you while, the long-term payoff cannot help but pay you dividends in position, compensation, and fulfillment.

What do both have in common?  PEOPLE!  See where these fall.  Your personal investment in those around you yield rewards.  Be authentic, and be willing to give yourself over to making relationships work.  Projects are executed by people.

1. Start working before the rubber hits the road.  Be ready to live with the effort you put into everything.
2. Surround yourself by people that do what you need better than you can do the job.  How can you delegate effectively if you cannot trust the work?
3. Work hard.  People know the difference this and the alternative.
4. Stand up for what is the best.  Quality always shows.
5. Know the difference between ego and the best approach.  No relationship worth having is advanced by ego growth.
6. Be ready to provide a plan when things go off the rails.  Problem happen, but be ready to recover with a realistic plan.

How do you think about one of the most common structures in all of electronics/electrical design?  I recall having very little thought of the difference in them even after a rigorous course covering electrodynamics.  From the age of twelve to twenty-two, this was unchanged from the basic understanding that wavelength intervals made the magic happen.  Regurgitation of knows with a little illumination remained my level of enlightenment.  Something changed as soon as that course was over!

Finding myself in a situation needing to provide a specific signal level with a known variation in orientation to a remote data source moved me to understanding!  Stress and the need to produce a working design does that.  Let us break it down.  This is how I think of antennas to provide better understanding.

• Frequency selective (this makes them a filter)
• Spacial filters (this comes up when the filter is directional)
• Converter of a spacial electromagnetic wave to a useful electrical potential

The idea is that we want to go from this:

For the purposes of ending up using something like this:

This could be in reverse, but the point is made.  We either need to produce a signal that ends up propagating through space, or the need is to receive a signal floating in the ether for the purpose of recovering useful data.  Make James Maxwell and Claude Shannon proud!

If you an an engineering student languishing without the confident in how to design an antenna, checkout some of the “cookbook” books on the market.  Your school’s library likely has at least one, but they often sell for $20-$35.  This provides the basis of many simple, useful designs.  Try not to sweat the analysis if you do not need to do so.  However, do not expect to find extensive detail about antennas over 3GHz in many of these texts.

Are you an engineer that needs to get something ready now?  I often recommend spending some money on basic design tools.  Mathworks has the Antenna Toolbox that provides many design tools for analysis, synthesis, and simple Method of Moment simulation.  Getting that into a real design can be done without high-end CAD tools, but I would certainly recommend working through your impedance matching with a solid tool.  Your time is valuable, and the more value you bring to your company brings results.  If your leadership will not invest in them for the long run, show how much time it will save, but think of them as a force multiplier.  Show the return on investment for serious engagement.

If you guidance of design consultation, contact me!  I am happy to see how I can help, and that many be another person of resource to point you toward.  Enjoy!