초록 ▼

The RF power and video modulation monitoring circuit of the invention provides the unique capability of monitoring the performance of a repeater/noise jammer countermeasures system when the system is operating in either the repeater or the noise jamming mode. In the repeater mode the systems noise l

The RF power and video modulation monitoring circuit of the invention provides the unique capability of monitoring the performance of a repeater/noise jammer countermeasures system when the system is operating in either the repeater or the noise jamming mode. In the repeater mode the systems noise level is measured in an unused portion of the countermeasures system frequency band to provide a monitor of system gain and antenna VSWR. In the noise mode crystal detection and threshold comparison provides an indication of RF power output. In either jamming mode the measurement of AC in the detected output provides a monitor of modulation.

대표청구항 ▼

In an electronic countermeasures system adapted to function in either a noise jamming mode or a repeater mode and in which the system is operated in frequency bands selected from a multiplicity of frequency bands the improvement comprising a system monitoring circuit, said monitoring circuit includi

In an electronic countermeasures system adapted to function in either a noise jamming mode or a repeater mode and in which the system is operated in frequency bands selected from a multiplicity of frequency bands the improvement comprising a system monitoring circuit, said monitoring circuit including a first coupling means connected to couple a portion of the power from said countermeasures system, a second coupling means having an input port and first and second output ports, said second coupling means being connected to receive power from said first coupling means, a band pass filter having a band pass frequency centered on the center frequency of an unused system frequency band said filter being connected to receive the output of said second output port, first and second crystal detectors, said first crystal detector being connected to receive the output of said first output port and said second crystal detector being connected to receive the filtered output of said band pass filter, a peak detector, a D.C. amplifier, a threshold detector, a dual threshold threshold detector, first and second Nand gates, an OR inverter gate, a system noise jamming mode bus, and a system repeater mode bus, said peak detector being connected to receive the output of said first crystal detector, said first mentioned threshold detector having its input connected to receive the output of said peak detector and its output connected to a first input of said first Nand gate, said DC amplifier being connected between said second crystal detector and said dual threshold threshold detector, the output of said duel threshold detector being connected to a first input of said second Nand gate, said system noise jamming mode bus being connected to a second input of said first Nand gate, said system repeater mode bus being connected to a second input of said second Nand gate, and the outputs of said first and second Nand gates being connected to first and second inputs of said OR inverter gate.