Hywel: Hello everybody, I'm your host Howell Curtis, and I'd like to
welcome you to The Space Industry by Satsurge, where we share stories about
the companies taking us into orbit.
In this podcast, we delve into the opinions and expertise of the
people behind the commercial space organizations of today who could
become the household names of tomorrow.
Before we get started with the episode, remember you can find out
more information about the suppliers, products and innovations that are
mentioned in this discussion on the global marketplace for the space at satsurge.
com.
Hello there and welcome to today's episode of the Space
Industry Podcast by SatSearch.
I'm joined today by some returning guests on the podcast, Michael Seidel
and Adrian Helvig from Global Electronics Manufacturer and a SatSearch trusted
supplier, Texas Instruments, a name you're, you must be familiar with if
you've listened to this podcast, but also if you're anything to do with the
space industry or a wide range of other industries where Texas Instruments or
TI as it's commonly known operates.
It's great to have you both.
Back on the show, really really interested to hear more about the the work that
tech, that TI is doing in space.
There's always a lot of information presented by the company about the
different applications and components and and how they can be used to
improve missions that TI shares.
So this is great.
Now today we're going to be talking phased array antennas and how they can improve
both performance and flexibility, which is, or versatility, which is increasingly
important in modern space missions, as we're seeing teams professionalizing and
services, trying to try to get more value and do more with the equipment and the
resources and the people that they have.
Yeah, I'm really excited to get into this topic today.
Now, we'll start by setting the scene a little bit, many people in
the space industry are increasingly aware of how congested the RF
spectrum has become and is becoming.
And there's a few different reasons for this.
I wondered if Adrian potentially could, explain why this problem has
come about and what RF engineers are doing or can do to mitigate it.
Adrien: Yes, sure.
Welcome everybody.
Yeah.
So I will be happy to answer that one.
So the RF spectrum has become very crowded for several reasons, really.
And the fact is we need to, More data and faster speeds, right?
So the demand for available spectrum simply has increased.
In addition to that, there are also many new application in services.
Like for example, phone services, internet services, or air observation satellites,
like weather satellites, for example, defense communication, those applications.
I using up more of the spectrum.
And let me also add one additional point here about the low earth orbit
satellites, because on the one hand, you can think those are offering more
data transmission opportunities for your system, but at the same time they are
also creating another problem, right?
Because those satellites are moving very quickly.
Relative to ground.
And this makes really hard to maintain the stable communication link.
Yeah.
And now to deal with all those issues, engineers, developers,
they are developing new solutions.
And to be very honest with you, the one of most promising is the
use of phased array antennas.
So actually our topic today, and this antennas can direct the
communication beam electronically.
without needing mechanical parts to move.
And this allows really for better use of available spectrum
by sending multiple signals at different angles and frequencies.
And at the same time, this technology helps also to reduce the interference
and improves overall system efficiency.
And In using the RF spectrum.
So in summary, by using the phased array antennas, the space industry can
really benefit and handle the anyway, very crowded RF spectrum much better.
Okay.
Hywel: Fantastic.
Yeah.
It makes sense as we've seen the industry scale in that these, there's
some very valuable areas of the spectrum are under increasing demand, but yeah,
when you explain issues like the.
Leo satellites there, though, the how hard it is to maintain
those stable communication links.
I think that really puts this issue into perspective.
And as you say, the phased array antenna technology is seen as a
really promising solution for this.
As I mentioned in the intro to the show let's Get into more
detail on this technology.
Now, as far as I understand, phaser antennas bring two big benefits.
The increased versatility because of, as you mentioned, the digital beam
forming or the electronic steering.
And that I believe they can enable greater bandwidth because they
can operate with narrower beams.
So I wonder if we could discuss this first point and, please correct my inaccuracies
if they are there, but yeah, I wondered if Michael, if you could explain what
digital beamforming is and what benefits it can bring to space applications.
Michael: Yes, I'm very happy to attend.
This is definitely not trivial to understand, but let me give it a try.
Imagine you have several antennas, not only one antenna, but you have
several antennas next to each other, and you really put them equally spaced.
One.
next to the other, right?
And they form an array of antenna.
That's either a linear array in only one dimension, but they're next to
each other, or you put them in a rectangular format and have them in two
dimensions spaced next to each other.
But you have multiple antennas and all these antennas, they
send the very same signal, right?
They just add up, they accumulate and form altogether a, now a a radiation
characteristic with a single beam but a more focused beam than if
you have only a single element.
So that's the first thing we have to put there to get a more narrow, more focused
beam, because you're accumulating the characteristics of multiple antennas.
together.
And the second one, and that's actually a pretty interesting even
fascinating fact happening there.
What people do now is they put a delay where you're saying all antenna
elements send the same signal.
They do send the same signal, but each one a little bit later than the other one.
So you put this constant delay on each one of those next to each other.
And then the interesting thing, what happens then is
then the angle of radiation.
It changes its direction, like the very front is moving in
a different direction then.
And really controllable by the delay you apply to each of these elements.
And that makes now this antenna steered purely based on electronics.
So no mechanics involved.
And that is of course a big benefit that if you don't have to send
many mechanics to space, that is of course a major advantage.
And now the.
The next level of interest is like you have, you can have this steering
of the beam you're radiating.
You can differentiate between frequencies.
So you have one carrier frequency getting one set of delays and
the other carrier frequency getting a different set of delays.
And with that, you have now two beams of different frequency
pointing at different locations.
And this is where you can now put groups on ground, user groups on ground together
and give this one group one carrier frequency in one direction and the
other group another carrier frequency.
And this is how you divide up the spectrum very effectively and with
a very focused theme where you accomplished on the best signal to noise.
ratio on these user groups.
Hywel: Really interesting.
So it's almost as if you're operating with two different antennas physically
pointing in two different directions, but you aren't, you're using the same
one that's electronically pointing the beam in different directions.
Interesting.
And then What about the achieving the increased data rate by
operating with narrow beams?
How does this aspect of things work?
Adrien: Yeah, so that, that's really another aspect of using
those phased array antennas.
Let me try to explain.
Achieving those increased data rates by operating with narrow beams, Works
because this better focused antenna beams ensure that the transmitted signal arrives
at the receiver with greater strength.
And when the signal is stronger, it improves so called
signal to noise ratio, right?
And this means there is less interference and the received signal is clearer.
And this clearer signal allows simply for higher data throughput.
As more information can be transmitted accurately and efficiently.
So thinking about this, those narrow beams are really essential in, in boosting data
rates and and making the communication link more reliable and robust.
Hywel: I see.
That makes sense.
Okay.
Yeah, got it.
So we have these, we have this technology, the phased array antenna technology.
It provides these certain benefits around increasing the data rate and so on.
We mentioned that the RF spectrum is, Gary, particularly crowded.
Therefore, this kind of technology is needed, but to bring it to home,
to the so that space engineers and mission designers really understand
what value this technology brings.
I wonder if you could give some examples of.
different space applications and services that would benefit the most from
using phased array antenna technology and why that would be the case.
Adrien: Yeah.
Yeah.
So there are really many and I can try to list some of them.
In general, phased array antennas would really greatly benefit in would greatly
benefit any space application that relies on high data transmission, right?
So the best example here is telecommunication services.
Why?
Yeah, because they need high data rates.
Another example could be rather imaging applications.
Those application would also benefit from this because they need very strong
focused beams for accurate imaging.
And there is also another aspect I wanted to talk here.
Those more focused beams helps also to reduce the transmit power, right?
And this makes the whole system much more efficient.
And now in the beginning, we were talking about the challenges of low
earth orbit satellites and their rapid movement relative to ground.
So now with the phased array antennas, They can quickly adjust
to compensate for those rapid movements and this ensure again the
reliable communication link, right?
So overall, those phased array antennas improve your performance, your efficiency
and reliability across really a wide range of space application and services.
Hywel: Okay.
Makes sense.
But of course.
We always try and address this when we talk about space engineering, missions
in space are all about compromising.
You mentioned, as you mentioned earlier, the, we can't send
mechanics into space to fix things.
There are unique limitations placed upon any technology.
because of the extremes of the operating environment.
So my next question is, how is the swap C budget of a mission affected
by using phase array antennas?
And what can engineers do to deal with the, I would guess,
inevitable trade offs that would occur by using these technologies?
Michael: Yeah.
Yeah.
I think first off, I think you suspected already looking at the number of
elements, the, Amount of electronics and the cost and the power budget and
the size and the weight all goes up.
So your swap or the size, weight and power and cost budget is that the first plan
compromised, but what you get in return is, of course, the amount of data rates
and the amount of data rate per user.
You accomplish with it, and that really matters, right?
And this is where the ratio improves a lot, right?
So it's absolutely worthwhile going there in this direction
by increasing the data rate.
And we said it before, right?
No need for mechanical steering is, of course, also very important.
Good benefit, important benefit, and it's super fast, right?
As we move over ground very fast that is where these electronically steered
antennas help us very much with the big challenge that is probably
will always be around with us.
We put a lot of electronics in a very dense area.
And that is where the challenge is.
And of course, the amount of electronics and the complexity increases the cost.
But this is where the good news is that meanwhile, the electronics
industry and semiconductor industry has come up with solutions that
really make it now possible to come.
at reasonable heat development and reasonable cost, so we can really
enable these phased array antennas now also for satellite missions.
Hywel: Fantastic.
Yeah.
Thanks for addressing those the balance that needs to be struck.
The heat generation is one thing, but as we're seeing Something
of a trend towards larger form factor systems in the industry.
This is partially mitigated because obviously larger systems are able
to deal with heat generation, waste heat in different ways.
And also then you can cope with more complex engineering, sometimes
more easily in a larger system.
Excuse me, but yeah, the balance that needs to be struck in terms of
increasing the SWOT budget is key.
And I, as you highlighted, Michael, the.
the aim is to get a great balance of cost for performance, not absolute cost.
So yeah, if you're, if the cost at which you're developing data creating,
generating data, sorry, is lower, and the data quality is higher based on the same
unit, then you're in a good position.
But you also highlighted the complexity involved in the engineering here.
As a provider of these sort of systems, how does Texas Instruments help engineers
or how can you help engineers to deal with this complexity and incorporate
phased array antennas into designs and development of space missions?
Adrien: Yeah, so we are really offering a wide range of solutions
here to help engineers to, to use this technology in their designs.
Let me talk about some of them.
Obviously we need to start with high speed ADCs, DACs and analog frontends, right?
And TI is offering really advanced ADCs and DACs with high data rates and
wide bandwidths at the same time with lower power consumption, lower noise.
You need those data converters for capturing and transmitting.
And to be honest, sometimes even for processing the high
frequency signals accurately.
And I'm thinking here about devices like the ADC12DJ5200 SP for receiving a
part, but also on the transmit part, for example, the DAC39RF10 SP can be used.
Now, if the customers prefer more integrated solution.
We can also offer so called analog front ends.
Those products simply integrate several of those ADCs and DACs into one device.
And I'm thinking here especially about the recently released AFE7950 SP.
Which is our direct sampling analog front end, which supports
frequencies up to X band.
Now, if you talk about ADCs and DACs, obviously you also need to consider
clocking, which is also essential for those kinds of applications because you
need extremely low phase noise and jitter.
sometimes even to femtoseconds level, right?
And another important topic when we're talking about clocking is
the synchronization feature with very high accuracy sometimes
down to one picoseconds.
And this is really essential.
For maintaining this precise timing between phased array systems and elements.
And now if the customers needs a jitter cleaning and distribution
capabilities for clocking signals, they can use our LMK 04832 SP.
Or if they, for example, need to generate a signal and need the synthesizer, they
can use LMX2615 SP or the LMX2694 SP.
In addition to that, I also wanted to mention a pretty new trend also
in space application, a lot of customers already trying to replace
their bulky discreet balloons with fully differential amplifiers.
And exactly for that reason, We are offering products with high linearity
across a wide bandwidth up to 12 gigahertz at the moment and the current portfolio
supports one db gain flatness up to around eight gigahertz at the moment.
The product is called TRF0206SP which is exactly four differential
amplifiers for this kind of application.
And now the big advantage, this fully differential amplifier compared to the
balloon is much smaller and much lighter.
So that's a really perfect fit for those space constraints applications like
communication equipment, for example.
Hywel: Okay.
Okay.
Yeah.
I see guys are clearly thinking about everything required to really incorporate
the phase array antenna technology into.
Space mission designs and deal with the the interfaces and the data rates,
the managing the data rates and getting the best out of those systems and
your communication system as a whole.
What about the power management, however how is this dealt with?
Michael: Yeah, this is of course, also a super important topic,
especially on face the ray antenna.
And the one thing is you need to have these power.
Our distribution of power generation devices a daily, highly
efficient in a small form factor.
So we talk about our power density, very high, and we're
talking RF signal, RF solutions.
So we need to also have very low noise, right?
We're highly interested in the signal performance, cannot use any noise there.
And so there is a.
Quite a lot of solutions we can offer here to really provide here a very
accurate and stable power supply.
So here's the so called point of loads, the POLs, like the TPS7H4011
SP that allows you even up to a 12 volt input to generate They're low
voltages or you have Another good example is an LDOA very low noise.
LDO is called the TPS seven H 1 1 1 1.
sp very easy to remember that has such low noise or high PSRR power supply rejection
ratio is so extremely good on that one that customers call it really, it's like
this is an ideal power supply for us and that is of course, extremely helpful.
For the end product, of course, but also during development, as you
optimize the system, you just know there's one thing less to worry about,
you have a perfect rail, whatever causes your signal to degrade.
It's not that power rail that makes things a lot easier for you, of course.
So that's the overall power tree for supplying the data converters and maybe
the FPGA and processing capabilities.
Another.
Key element in the power budget is, of course, the power amplifier, the power
you transmit has to be all generated by this power amplifier and these
solid state power amplifiers, modern devices, they need a very powerful
are complex biasing control systems.
So they need a certain voltage level that needs to be supplied.
And according to the temperature and the current running through
the power amplifier, you need to adjust this biasing voltage.
And Here comes a device from TI that can, it's really helpful here.
It's called an AFE11612 SEP, a highly integrated analog front end that has
12 DACs and 16 ADCs plus temperature sensors and a couple of GPIOs integrated.
And that really helps to get you the PA biasing and control.
implemented in a very effective way.
That's the aspect of the power tree itself.
But in space, we have also the topic and this was many times not really
immediately thought about is the fault detection, isolation and recovery.
So whatever we do in space, we need to make sure if something goes wrong.
the electronics quickly identify the problem, but not only identify it,
but they need to isolate the problem from the rest of the system and
need to see how to recover from that and get the system back up working.
So that's fault detection, isolation, and recovery.
It's a play of where you need to, of course, need sensors
and detect the problem.
So we have this in our power devices, oftentimes integrated with the overcurrent
protection, overvoltage protection and detection, overtemperature detection
and corresponding fault output pin.
So the system can be informed that something went wrong.
As we talk about isolation, we have load switches with even with precision current
sensing implemented meanwhile, like here's a device like the TPS7H2140 SP,
so this is a 32 volt Quad channel issues.
And these load switches can then either automatically detect that
something is wrong and switch off and isolate the problematic system
from the rest of the bus, or can be actually be controlled by another
system manager to disconnect things.
And this control and management or orchestrating this whole fault
detection, isolation and recovery There comes a device handy.
It's called the
TMS570LC4357 SEP.
It's an MCU we just released for SpaceGrade.
It's a device integrating our Cortex R5 floating point cores and actually
two of them are operating in lockstep.
And this overall design here being especially developed for high reliability
applications that offers a really a very high diagnostic coverage, but also
a very near instant fault detection, as we call it, and it's here very
helpful in orchestrate the FDIR.
Adrien: Michael, let me, At maybe additional point also on the
multi mission support, right?
Because it's also a very important point and TI supports simply
different mission requirements also.
So depending on the orbit customer is operating the application, so low
earth orbit or geostationary orbit The customers can choose between a plastic
package with higher radiation performance, so called QML class P, or plastic
space enhanced product, so called SEP.
And now the most important advantage, those products are in
most cases pin to pin compatible, which offers a huge flexibility
for customers in their designs.
And at the same time, it makes Sure, customers are using dedicated
product for their space environment.
Okay.
Hywel: Yeah, this is a very important aspect as well, as we're seeing as
we discussed, more versatile missions longer missions or missions with multiple
goals that may be in different orbits potentially or a customer who's creating
technology for different, different satellites or different vehicles, whatever
it is for different orbits that, but they want to, limit non recurring energy by
non recurring engineering, apologies, with a consistent aspect of the technology.
So yeah, this is great.
Thank you.
So I can see how much that TI is doing in this area and mentioning
fault detection and understand the power management separately from
the data data rates and the data.
chain compatibility has been really useful.
Thank you.
Thank you for going into detail on this and to the listeners, we'll obviously
share more information about the different products and TI resources that
have been mentioned in the show notes.
So you can read more into how these sorts of technologies and the designs
of the application notes and the thinking behind them can be readily
incorporated into your designs, your plans if this is of interest to you.
So thank you guys for that.
I just wanted to wrap up by, yeah, coming back to the topic that we started with and
discuss how in a wider sense, you see this aspect of the space industry evolving.
It would seem like the RF spectrum is only going to become
more crowded in the short term.
And We might then run into issues with an increased regulatory burden, where
the bodies in charge of apportioning and controlling the spectrum are
requiring a greater, admin overhead of space missions and companies might even
make it difficult for some companies, especially those smaller, newer
teams to get satellites into orbit.
On the timescales and budgets that, that makes sense to them.
Yeah, I wondered what your thoughts were on how you see this area changing
and progressing, moving forwards.
Yeah, I
Michael: think it's definitely on the move and I think we have reached.
Critical mass.
So that's the trend to face Dorian tennis is probably very hard to reverse anymore.
But what we will definitely see moving forward is that we will see
an increase of number of elements.
Because that gives you always, as we talked about before, a more focused
beam that you want and allows you also have even more beams per antenna.
And that all translates then into those benefits of you have maybe
more users and higher data rates per user per beam, more users overall.
So just a bigger business after all.
The other trend, as you say, the spectrum is getting crowded, so people
try to go even higher frequency bands and as technology proceeds where
this is entirely possible, and here comes for change something good.
The higher you go in frequency you're shrinking the space needed
between the antenna elements.
So this is you.
How you put them together.
Then if these spaces go even smaller, you can have put more elements
per antenna, per square meter or per area if you want, right?
So that's actually going really the right direction.
What's not helping here is that your heat problem.
increases the moment, right?
You put even more electronics on an even denser space, but that is where
yeah, or companies like us at Texas will keep working to help on that area.
Another positive trend in the satellite technology is that the
cost of launch per the kilogram.
per weight keeps this decreasing.
So that's just where we have multiple new players now that help bring down the
cost in this newer rockets and launches.
And that enables them even more satellite players, more application
services, business models there.
And maybe look at an example like cell phones.
Of course, they're directly connected to satellites already today.
We can do voice, we can do text, but moving forward, we will have true
broadband Our internet access over satellites from our cell phones.
So in every area of the, on earth, you can really reach your broadband connectivity.
And so we see there is an continuous grow and development
in this market ahead of us.
That means that our customers need to redevelop, but they also want
to reuse things they want to, use.
Standardized components, so they don't always have to start from scratch.
They can really have an evolution in the product development.
And there's also the need for one development and support
multiple mission profiles.
Adrian had pointed out you have the SEP for the LEO missions,
the QMLP for the GEO missions.
Moving forward, you have the pin compatibility.
And all that in mind this is where TI is so convinced what's needed here is really.
Space great catalog products in a way, you know what they are, you can reorder
when you want them, you can reorder as many as you want, and you can do
this also in 10 or 15 years from now.
Hywel: Fantastic.
That makes sense as the, as a, an approach to the industry.
Yeah, I think we've seen how this.
These kinds of approaches obviously work in other industry sectors.
And I think yeah, TI is really doing a great job of operating in this
manner and yeah, it was great to to understand your thinking behind
how this area is moving forward.
So I think this is a great place to wrap up today's conversation.
Thank you both for sharing.
Thank you, Adrian and Michael for sharing so many of your insights today on how.
Face array antennas work what they use for the advantages that
they bring, how to cope with.
The trade offs in terms of, the power and the heat and the engineering
complexity and what can be done to ease that integration and of the, of such
technologies into existing designs and space missions and plans for the future.
So thank you both very much.
We'll share, and to the listeners, we'll share more information on the
products and resources mentioned by the guests today in the show notes.
And you can find out.
More about TI on their website and on their search portfolio, which is very
extensive and has a lot of information on the products that we've discussed today.
So thank you to everybody out there for spending time with us today
on the Space Industry Podcast.
We really appreciate your attention.
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on your favorite podcast player.
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the companies taking us all into orbit.
Thank you very much.
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