First decent image of INS Arihant

Brahmos Block III was tested again yesterday. Apart from having steep dive mode for bunker busting it carried a new guidance chip, G3OM (GPS + GLONASS + GAGAN). The chip is small enough to be fit inside miniature PGMs.

A bit of info on the roll that affects Sudarshan LGB kit restricting it’s CEP to 10 meters.

ADE is engaged with design & development of high precision laser guided bomb (LGB). It is
an air dropped munition that by help of its seeker guides itself towards the target. The associated
control law deflects the front canards to generate the desired trajectory. Figure 1 shows its overall
configuration. During its free flight, Air Weapon generates a roll which may be arising from
sources such as manufacturing asymmetry, small protrusions, separation dynamics or unsteady
atmospheric conditions. Though the roll is unintentional, it is generally not harmful, as small
amount of roll provides lateral stability to the flight. The control law is also such that it is able to
incorporate some amount roll while guidance is given to munition. The problem arises when roll
rate is more than 10 RPM which causes control law to be ineffective and it becomes difficult to
guide the munition.
In such instances, the canards are deflected so as to generate rolling moment for reducing the
RPM. It is observed that canards are not very effective in producing desired rolling moment due to
an “adverse roll” effect being generated from tail fin. It can be seen that the size of canards is
relatively large and when deflected, creates a large wake. The interaction of this wake with tail fins
is reason behind “adverse roll” effect. This phenomena leads to non linear rolling moment (w.r.t.
canard deflection). The non-linearity makes it very difficult to implement a roll control law in Air
Weapon.
Therefore, ADE has decided to modify the munition to a Free Rolling Tail configuration,
thereby, isolating the effect of tail roll on canard roll control effectiveness. However, whether the
free rolling tail will affect the overall aerodynamics of Air Weapon, is dictated by the roll rate of
tail, which is difficult to estimate.
ADE desires to investigate the “adverse roll” phenomena in Air Weapon by CFD-dynamics
studies with an objective to estimate the roll rate of tail fin under the influence of “induced” rolling
moment.

It looks like a 250 Kg variant of Sudarshan LGB kit is also coming out soon (on top).

From IIT-K yet another torpedo project, Glider assisted torpedo.

Projects : Glider Assisted Torpedo, NSTL Visakhapatnam

Sponsoring Agency : NSTL
Period : 2011-2012

The goal of this project is to develop a design of a glider configuration which when mounted on the torpedo can assist it to glide. The specified objective is to achieve a minimum range of 25 Km in a maximum duration of 250 sec when the whole assembly is launched from an altitude of 6 Km with a circular error probability of 500m. This study posed interesting problems in terms of high wing loading and development of compact mechanisms owing to the space constraints. Mechanisms are required to set the wing and tail in positions after launch, which otherwise are aligned with the torpedo and folded respectively, so that the system can fit in the bomb bay. Indigenous mechanisms are proposed to meet the requirements. Wing loading is very high resulting from the heavy weight of torpedo and geometrical constraints on design of wing. The assembly after launch has to be controlled with the help of an on-board autopilot using integrated GPS-INS so as to accommodate it in the flight envelop provided by NSTL, Visakhapatnam. Apart from glider design, this project involves evaluation of stability of the entire system during flight, trajectory simulation and performance against atmospheric disturbances.The mechanisms are developed using Autodesk Inventor software and the stress analysis on them for different loads is also carried out using the same software.

Prof. A.K. Ghosh Home page

Didnt the Dhruv’s indigenous dipping sonar also recently get quietly pushed into the long grass?. Last I read suggested a purchase of HELRAS was on the cards?.

I don’t think HELRAS has been ordered yet. The Mihir sonar program has been superseded by a newer(?) LFDS program which would be standard fit across Dhruv and Navy’s future procurement.

The low-frequency dunking sonar (LFDS) developed by DRDO’s Naval Physical and Oceanographic Laboratory (NPOL) at Thrikkakara has shown steadfast progress in trials and is on the threshold of induction into naval inventory, Rear Admiral D.M. Sudan, Assistant Chief of Naval Staff (Air), has said.

Helicopter-borne dunking sonars play a key role in the detection of enemy submarines. NPOL’s LFDS programme, which carries forward its experience of developing dunking sonar Mihir, had made substantial progress with encouraging results in extensive trials on board the Advanced Light Helicopter (ALH). We would not let this effort be wasted, said the Rear Admiral, asking sonar scientists to give the programme a final push to make the system worthy of induction.

It is already undergoing tests on Kamovs and Dhruv as per last info.

From that article:

What!?

APSOH, HUMSA, HUMSA-NG, NAGAN
by NPOL, BEL

Funny article,

Indeed, sonars is one segment where local production has almost all bases covered. These boats are supposed to be equipped with NPOL’s compact hull mounted Sonar Abhay meant for shallow water operations and not imports as the article suggests.
http://i.imgur.com/7xDSXyY.jpg

ABHAY (Compact Hull Mounted Sonar (HMS) System)

The only recent Indian Navy sonar import has been Atlas Elektronik’s towed ULF sonar, local production licenses of which have been acquired, which is also expected to be mounted on these boats.

3rd test of Astra missile from Su-30Mki.

Those are screenshots from a video. Found the video, use mute:-

I don’t think that video is going to remain up for long.
Some better screenshots