Furthermore, though F15 radar detection range is a bit longer
than JAS 39, but F15 RCS is much bigger than JAS 39, which means it
is very likely that a JAS 39 detect another F15 before the F15
detect it.
This is clutching at straws here, just because you say insist
something will be this way does not mean it is. Given all the facts
that we have and know, what you say is simply false.
Also you are using vauge terms, how much is "much bigger"? or
how very is very "very likely"? They seem to me to be terms used to
justify wishful thinking rather then facts.
Firstly how much smaller on radar is the JAS 39 RCS? Note that
RCS is more of a function of plane shape design then physical size,
the B2 is way bigger then the Gripen but it has a
much, much smaller RCS.
Also, AFAIK, if you are talking about a stealth aircraft, the
Gripen is NOT it. An example of a stealth aircraft would be the
F-22, the JSF, the B2 and what have you not. Even the
signature-managed Rafale is a much better example then the Gripen.
Trying to say that the Gripen can spring up on its foes like the
F-22 is patently not talking with much common sense, it's like
saying a house cat can take on a zebra like a lion because they are
both cats.
Talk aside, let's go to the facts.
How long can the Gripen hide from the extremely
powerful APG-63(V)3 radar of the F-15? How long can
it hide from the even more powerful radars of
AWACS that are being used? The truth is all things
considered, unless it is some aircraft like the F-22 or JSF all
these things about smaller RCS is utterly moot. The F-15SG will see
the Gripen long before it can even come in range of its
missiles.
This whole thing about seeing a few seconds before and getting
shots off at extreme range is pretty much rubbish unless you are
flying an F-22 or JSF, and it certianly does not apply to a budget
lighweight fighter designed with modest abilites.