ThomasP
Chief Master Sergeant
The HARM should work very well against the jammers it they are within practical attack range. Although the GPS jamming systems may be equipped with serious 'spoofing' (one example is signal switching) capability it they are set up properly.
The only GPS signal emitters (as far as I know) are either the GPS satellites or GPS jammers. As such, friendly GPS receiver devices/systems should not be vulnerable to attack by the ARM. The later AGM-88 HARMs are capable of being programmed to not engage outside of various sections of space - air and/or ground. There might be a possibility of the HARM picking up on the weak secondary reflection signal from large GPS ground station receiver antennae (maybe, IDK) at very short range, but the programming of the HARMs should prevent attack if the reflected signals are too weak or are not in the allowed attack sector. So unless the Ukrainians are also jamming GPS signals there should be no problem with homing on friendly GPS guidance systems.
However, the GPS signals are in the NATO D-band (from 1-2 GHz) which covers the upper part of the 'old' L-band (390 MHz - 1.55 GHz) and the lower part of the 'old' S-band (1.55 - 3.9 GHz). Both of these bands are still used by various radars, particularly the S-band. But there is no more reason to worry about the HARM homing on a friendly emitter than when targeting enemy radar emitters in the L & S-bands.
The only GPS signal emitters (as far as I know) are either the GPS satellites or GPS jammers. As such, friendly GPS receiver devices/systems should not be vulnerable to attack by the ARM. The later AGM-88 HARMs are capable of being programmed to not engage outside of various sections of space - air and/or ground. There might be a possibility of the HARM picking up on the weak secondary reflection signal from large GPS ground station receiver antennae (maybe, IDK) at very short range, but the programming of the HARMs should prevent attack if the reflected signals are too weak or are not in the allowed attack sector. So unless the Ukrainians are also jamming GPS signals there should be no problem with homing on friendly GPS guidance systems.
However, the GPS signals are in the NATO D-band (from 1-2 GHz) which covers the upper part of the 'old' L-band (390 MHz - 1.55 GHz) and the lower part of the 'old' S-band (1.55 - 3.9 GHz). Both of these bands are still used by various radars, particularly the S-band. But there is no more reason to worry about the HARM homing on a friendly emitter than when targeting enemy radar emitters in the L & S-bands.
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