It occurs to me that many active radar guided missiles right from the 1950s have had their own seeker and compact seekers are available for police cars and small boats. Why not use a missile seeker as a radar?
Active homing aams have transceivers(transmitter-receivers) but afaik even these aams are command guided via datalink upto a certain distance by host fighter’s radar and only in its terminal phase or perhaps a little earlier is the aam guided by its own radar. So the range of aam’s radar is not as big as the range of the missile
as it cannot guide it from the time it leaves the wing. The split guidance works fine given that nose of aam is so small for its radar. Also such emitters cannot track multiple targets I believe as they have only one victim to target.
Signal to Noise Ratio(SNR) varies as square of wavelength. If you reduce the wavelength to enable smaller aperture size the ratio will deteriorate as a square affecting the range.
There are 2 approaches that could be used inspite of a weak radar.Approach 1:
The analogy is searching in a huge dark conference hall illuminated only by a small ceiling bulb with a torch in hand. The faint illumination of ceiling bulb gives you a rough idea and which direction to go looking for and the torch in hand better illuminates the local area you are searching. The combination should work out better than scanning with a torch alone in a huge dark hall.
If a ground based mobile radar or airborne AEW guides in datalink with a trainer points out coordinates of threat to trainer and then switches off for safety, the trainer with its smaller radar can dash off towards coordinates and upon proximity it can use its own radar to narrow down threat precisely.Approach 2:
Shoot in the direction of emitter
This has been talked about on keypubs wherein the yanks say that when opponent in a dark room uses the torch you keep yours off and shoot in the direction of light. The trainer in this case with a weaker radar could still have a very sensitive receiver that would detect the emissions from enemy and upon not finding IFF signal could shoot in the direction of incoming radar waves.
One doubt I have however is that how would the trainer with its shorter range radar communicate its IFF to say a MKI returning home and avoid getting shot friendly?Regardless of approaches used the datalink must be implemented on trainers as well.
If the dish is aesa type, you can accommodate a larger size elliptical dish in a smaller dia pod by inclining the dish by an angle (theta) equal to maximum beam steering angle possible by its modules.
I still believe that if aesa type is not available, then flanker tail sting radar is right size though range needs to be worked upon. But for trainer’s pod we don’t need uber high specs, only need to reach target close to the specs of bandar’s radar(KLJ-7)
Look-up: >105 km (for RCS of 5 m2)
Look-down: >85 km (for RCS of 5 m2) (from wikipedia)
Su34 Fullback’s sting is the biggest among flankers- 70 cm in my estimate.
For the dimensions we are looking at, should inquire for specs of these 3 radars used in flanker stings/Light fighter nose - Pharaon, Rassvet No12, Tikhomirov OSA
Phazotron - Pharaonhttp://www.janes.com/articles/Janes-Avi ... mpany.html
Pharaon is a new multifunction X-band (NATO I-/J-band) airborne fighter radar, designed to offer comprehensive air-to-air and air-to-ground capabilities. Pharaon is a relatively lightweight radar marketed as a nose fire-control radar for light fighters, or as the tail cone radar for heavy fighter aircraft.
Phazotron/Rassvet N012http://webcache.googleusercontent.com/s ... clnk&gl=sg
N012 OKB: NIIR Rassvet Tail radar used on Su-35/37 operating at decimetric wavelengths which is installed in the long tail boom between the tail pipes. This radar forms part of the aircraft's defensive aids sub-systems suite (DASS) and warns the crew of approaching threats in the rear hemisphere as well as controlling active and passive jamming responses to such threats. Claimed to have a range of 50km for a 3 sq m RCS fighter, or 100km for a large aircraft. Scans 60° in azimuth and elevation.http://webcache.googleusercontent.com/s ... clnk&gl=sg
Last of all, the rear boom of the Su-35BM, mentioned above, will also house a radar, smaller in size and facing to the rear. For now, the choice remains open. It is known that Sukhoi has already tested the N012 rear-facing radar of NIIR Rassvet of Ryazan on its Su-27M's, a simple alert device functioning in decimeter waves. The same Rassvet has tested the N015 radar on the MiG 1-42, in centimeter waves and capable of designating targets with missiles that can be fired to the rear.
Tikhomirov is already offering its Osa electronic scanning rear face radar and is announcing an active-antenna version of it for the end of the year. In the same category, Phazotron has had the Pharaoh (or Kopyo-F) radar in its product range for several years, and last April in Moscow presented a Kopyo-DL active-antenna version in the decimeter band, the caliber of which adapts to the rear boom of the Su-35.
The drop tank dia of Hawk AJT in my estimates is 40 cm. A bit too small. Either a slightly bigger one could be developed or the current one be used for modification shown below. SH already does this for its IRST which is mounted on a drop tank. If the radar back end gets too heated the probe could either be rid off or better insulated and partition can be made wider to easily avoid fuel from reaching flash point. Standardize this drop tank for IJT Sitara as well.Auxiliary application:
The flanker tail sting radar could also be used to convert Akash into an active homing sam from a command guided sam so that its guiding radar on ground can switch off after initial guidance and move to safety while the onboard radar takes over.
And for stuff that goes above my headhttp://www.radartutorial.eu/07.waves/wa04.en.html
E/F-Band (S-Band Radar)
The atmospheric attenuation is higher than in D-Band.
Radar applications in this frequency band provide short range, very high resolution and high data renewing rate. In ATM these radar sets are called Surface Movement Radar (SMR) or (as p. o.) Airport Surface Detection Equipment (ASDE). Using of very short transmitting pulses of a few nanoseconds affords a range resolution, that outline of the aircraft can be seen on the radars display.
Am not an Elec engg guy either. Describing “eccentricities” of different range of wavelengths(bands) and how they differ especially in terms of absorbance(range-limiting), scattering, detection equipment compactness(detection materials(bandgap) are wavelength specific) even though they all fall within RF. rest is beyond me too