For something to target at a distance of 30km+ from ground, till date we cannot afford to have a Active seeker to work in Fire and Forget mode. We need to have a power source strong enough to support it for that long duration.
Passive seeker is another thing. Moreover are you aware whether we came up with a Passive or Active seeker this time?
IMO <30km can be supported in Fire and Forget mode. all in all it boils down to the OEM design/requirements obviously within SWaP constraints.
drdo has at its disposal a wide range of lithium thermal batteries to take care of onboard power requirements for missiles etc.
eg.
power (watts), life(s), weight(g)
4000, 300, 6500
500, 60, 570
160, 480, 1000
175, 40, 300
700, 200, 3000
336, 165, 1050
15000, 105, 5700
etc
etc
etc
basic battery design
these are manufactured by HBL and many of these are also exported.
unless drdo clarifies it is difficult to know for certain whether it is a Passive or Active seeker ,
anyways i have a feeling that given that akash mk1 is command guided , its highly possible they came up with active seeker (for terminal guidance) with a radar-supported inertial navigation system ( for mid course guidance ) for akash mk1s .