For overall technologies achieved with the missile itself (note, not the radar packaging/C3I/guidance etc), here:
http://drdo.gov.in/drdo/labs/DRDL/Engli ... chieve.jsp
CONTROL GUIDANCE ALGORITHM FOR CLOS GUIDANCE
In order to achieve shortest possible range of a weapon system, it is essential to develop CLOS guidance scheme in which missile is guided to the LOS in the quickest possible time. This technology has been developed for the first time in the IGMDP. Trishul system has been developed using this technology and it was demonstrated through 80 flight tests using various kinds of platforms. Required miss-distance (» 10 mtr.) has been demonstrated repeatedly through live firings against targets.
HEIGHT LOCK LOOP GUIDANCE ALGORITHM:
Trishul is the first indigenous supersonic missile having capability of flying 5 meters above the sea-surface. This has been possible by design of a sophisticated height lock loop guidance algorithm using a precision Radio Altimeter as a height sensing device. The sea-skimming capability of Trishul missile has been demonstrated through a large number of live firings from Naval Trishul Shore Installation at INS Dronacharya.
LITHIUM THERMAL BATTERY
Lithium Thermal Batteries have high power density and very long shelf life (in excess of 20 years). Trishul missile borne lithium thermal batteries have been indigenously developed, qualified & produced in large numbers.
DUAL THRUST ROCKET MOTOR
Dual Thrust Rocket Motor has been designed and developed indigenously for Trishul missile. Smokeless composite propellant has been indigenously developed for this Rocket Motor. Rocket Motor has been flight tested several times without any flaw.
Trishul missile is delivered as ammunition in a FRP canister. This launch container has been indigenously developed with various mechanisms like automatic umbilical retraction, transport-locking mechanism etc., along with its electrical interfaces.
FOLDING FIN TECHNOLOGY
In order to have minimum dimension of the launch container to accommodate more number of missiles on the launcher, folding fin mechanism has been developed for Trishul missile. All the four fins are folded when the missile is within the launch container. They automatically are deployed as soon as the missile moves out of the launch container. Design and implementation of the fin folding Mechanism has been a real challenge. Folding fin mechanism has been qualified through large number of flights tests without any failure.
FLOW FORMING TECHNOLOGY
Novel manufacturing technique called flow forming has been established for manufacturing of Trishul airframe structures. This technology has been successfully utilised for manufacturing of maraging steel rocket motor tubes, and other airframe structures of Trishul. This technology has played crucial role in reducing the hardware weight of Trishul missile.
Note, the dual thrust motor concept is now being implemented in Barak-8, albeit reportedly with a new design, which may be used for Astra-MK2 as well. MK1 benefits from the advances in propellant tech. developed for the trishul - have to check my notes for the exact ref., but trishul was our first breakthrough.
Coming to guidance being successful, its mentioned above, but for more details on how it was resolved, check here:
http://publications.drdo.gov.in/ojs/ind ... /1993/1030
The last bunch of tests were flawless and saw the entire missile-radar combo work for the IAF version. Another similar variant was for the Army.
The IAF then changed its mind and said it wanted a fire and forget system for LLQRM. Its a different matter, that seven years later, the program is inching along thanks to the high costs projected, though the IAF purchased a bunch of SpyDers - which would be just starting delivery now.
BTW, the Trishul thanks to its unique FCS combo - the Flycatcher radar + missile combo - was noted to be very hard to jam, and the Flycatcher was regarded as very accurate & capable. The choice, driven in part by mass purchase of the system by the IA, also complicated design though...