In lateral acceleration based controls(like the one shown above), the commanded acceleration in eqn(8) depend on various factors most importantly--how the target is maneuvering and structural limits of the missile. It is inherently more demanding than the trajectory tracking problem because in the latter, the slow dynamics loop is designed like-
Guidance law gives the desired azimuth/elevation---> desired rates are extracted from desired azimuth/elevation ---> Desired controls are extracted from desired rates.
There we are, mate! Let us suppose that
the structural limits are set and known for
the H-Brahmos. That end won't change.
Then let's fall back on target mobility and notice
how limiting hypermach speeds are for control.
In case A, a big slow moving target such as a
Lion Ing* is within reach of control laws and all
or almost all the job falls on the seeker, really.
In case B, a small fast target like a J-20 or even
a ground vehicle will likely evade control capabi-
lities rather easily. After all, a simple right turn
at mach 7 consumes a lot of space
( and power ).
There will be a class of targets unattainable for
hypermach weapons for the foreseeable future.
Let's review tactics understanding those (initial)
limitations : Large scale attack _HMW= perfect.
Stationary target at very long range= perfect.
Moving target, big and slow
& far, adequate with
great seeker or great control loop or later AI.
Moving targets below a certain size : wrong.
Moving targets over a certain speed at maximum
HMW's range : depends on target maneuverability.
So, volleys of land-based HMWs or sub-based if
predetermined targets, on stationary objectives
located in dense enemy territory, fine! Using HMWs
within your territory targeting incoming menaces,
excellent especially if target unaware of launch.
BVR fighter missile : preposterous, at least for now.
What is big, slow and far a target in the mind of the
nation that "sells" hyper mach weapons? I think I
gave enough of a hint in my outlined cases especial-
ly if you consider the Seabasing concept.
_ _ _ _
As for this new announcement, it is not so new :
Next BrahMos missile targets Mach 7, integration with SU30MKI completed
WHITESMOKE, Aug 11, 2012, in forum: Indian Defence Forum
15 minutes of flight at mach 7 from an MKI
launched from Hasimara AFS would easily
reach Shangaï if launched at 1,200Km from
base, leaving the aircraft well able to return?
For reference, at 20ºC, dry air and sea level,
Mach 7 equals 8,535.71 kilometers per hour.
So, despite Kaptaan Ali's mumblings, apart
from long range, faster speeds for most mil
applications will come the old fashion way
by augmenting existing Mach 3, Mach 4 +
weapons ... which is what's happening here.
I'm still dubious on such timetable claims.
They seem to me to correspond to the usual
bragging by armament corps to get more ...
money... sorry, funding.
Have a great day, Tay.
* Neither ING the bank nor Emperor Ing from
Metroid Prime but the SF&F novel character, OFC!