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GPS signals can be encrypted. In fact the “fine code” was encrypted for many years. But the DoD shut that off so the troops could use the many commercial GPS units. Carrying around encryption/decryption devices is expensive because of the requirements to protect the encryption device.

But an air to air drone has to have some way to sense either where it is, or where it's target is, probably both. It needs to know where it is, to be able to handle ques from a parent aircraft. Unless whatever is sending the cues also can independently know where the drone is, and can send relative position cues, rather than absolute target coordinates. (ie. target is 100 nm at 135 degrees magnetic rather than “target is at 110.0159N lon 67.9021W lon) Either way it still needs it's own sensor. Unless it can lanch on a relatively crude heading/range information, and the missile it launches has the sensor.

GPS signals can be encrypted. In fact the “fine code” was encrypted for many years. But the DoD shut that off so the troops could use the many commercial GPS units.

There is a encrypted M code GPS signal.

GPS signals can be encrypted. In fact the “fine code” was encrypted for many years. But the DoD shut that off so the troops could use the many commercial GPS units.

There is a encrypted M code GPS signal.