Rapid document detection and identification

A method of remotely detecting and analyzing a target item, the method comprising:

• illuminating the target item using transmitter circuitry that outputs configured radio frequency (RF) or microwave electromagnetic energy that stimulates electromagnetic signals in the target item, the stimulated electromagnetic signals in the target item configured to mix with the transmitted electromagnetic energy to produce forced non-linear emissions that radiate from the target item;
• and
• receiving the forced non-linear emissions from the target item using receiver circuitry for a subsequent analysis and evaluation,
• wherein the target item includes an unpowered resonant security structure comprising conductive ink that increases the forced non-linear emissions to enhance the detection of the target item and to simplify the subsequent analysis and evaluation.

A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a software defined radio (SDR) system that remotely detects and analyzes a target item, to configure the SDR to:

• illuminate the target item using transmitter circuitry that outputs configured radio frequency (RF) or microwave electromagnetic energy that stimulates electromagnetic signals in the target item, the stimulated electromagnetic signals in the target item configured to mix with the transmitted electromagnetic energy to produce forced non-linear emissions that radiate from the target item;
• and
• receive the forced non-linear emissions from the target item using receiver circuitry for a subsequent analysis and evaluation,
• wherein the target item includes an unpowered resonant security structure comprising conductive ink that increases the forced non-linear emissions to enhance the detection of the target item and to simplify the subsequent analysis and evaluation.