An identification friend or foe (IFF) transponder includes: an electronic receiver to receive encoded challenges from an IFF interrogator; a processing circuit including a decode circuit to decode the received challenges into encrypted challenges using a time of day (TOD) and/or a cryptographic key, a decrypt circuit to decrypt the encrypted challenges into challenges using the TOD and/or the key, a reply circuit to generate replies to the challenges, and an encode circuit to encode the generated replies using the TOD and/or the key; an electronic transmitter to transmit the encoded replies to the IFF interrogator; and an alert circuit to detect the encrypted challenges from the received challenges without using the TOD or the key, use the detected challenges to determine if the TOD is incorrect and/or the key is wrong, and issue an alert in response to determining the TOD is incorrect and/or the key is wrong.

A radar system includes a radio frequency (RF) section that is controllable to focus operation in one of a plurality of fields of view (FOVs) and a control section configured to identify a side of the vehicle in which the radar system is installed and direct the RF section to focus transmission and reception in one of a first or a second FOV based on the side of the side of the vehicle in which the radar system is installed. A method includes: transmitting RF energy and listening for a reflection from a predetermined target mounted on one side of a vehicle; determining a whether a reflection has been detected; and directing the RF section to focus operations to the FOV that is predetermined for use for a radar system mounted on a same side of the vehicle as the predetermined target when a reflection has been detected.

A transmitter includes a processing circuit to generate I level data and Q level data that, when respectively converted to I baseband input and Q baseband input, cause a carrier signal modulated by the I baseband input and the Q baseband input to have a desired edge shape in the time domain. The edge shape includes a low portion, a high portion, and an edge portion between the low portion and the high portion. The edge portion has a desired edge time compatible with the frequency of the carrier signal. The transmitter further includes a digital-to-analog converter (DAC) to convert the I level data to the I baseband input and the Q level data to the Q baseband input, and an in-phase and quadrature (I/Q) modulator to perform I/Q modulation of the carrier signal according to the I baseband input and the Q baseband input.

A transmitter includes a processing circuit to generate I level data and Q level data that, when respectively converted to I baseband input and Q baseband input, cause a carrier signal modulated by the I baseband input and the Q baseband input to have a desired edge shape in the time domain. The edge shape includes a low portion, a high portion, and an edge portion between the low portion and the high portion. The edge portion has a desired edge time compatible with the frequency of the carrier signal. The transmitter further includes a digital-to-analog converter (DAC) to convert the I level data to the I baseband input and the Q level data to the Q baseband input, and an in-phase and quadrature (I/Q) modulator to perform I/Q modulation of the carrier signal according to the I baseband input and the Q baseband input.

According to a non-limiting example embodiment, a remote control device includes a display configured to display a risk map; an input interface configured to input a travel route for an object to move along; a computing device, including at least one processor, the computing device configured to: receive obstacle information detected as the object moves along an actual travel route based on the travel route, and receive route information of the actual travel route of the object; and reset the travel route inputted by the input interface to a reset travel route in real time based on a mission given to the object or a risk level in each of a safe area and a dangerous area displayed on the risk map.

According to a non-limiting example embodiment, a remote control device includes a display configured to display a risk map; an input interface configured to input a travel route for an object to move along; a computing device, including at least one processor, the computing device configured to: receive obstacle information detected as the object moves along an actual travel route based on the travel route, and receive route information of the actual travel route of the object; and reset the travel route inputted by the input interface to a reset travel route in real time based on a mission given to the object or a risk level in each of a safe area and a dangerous area displayed on the risk map.

A ranging apparatus of an embodiment is a ranging apparatus adopting communication type ranging by a phase detection scheme. The ranging apparatus including: a transmitting circuit configured to be able to transmit by a plurality of channels used for data communication and configured to transmit a transmission signal obtained by modulating transmission data; and a control circuit configured to control the transmission circuit to cause a plurality of continuous waves having mutually different frequencies to be generated in a same channel as continuous waves used for ranging by the phase detection scheme.

An ADS-B transponder system is associated with a vehicle including a transponder. The system includes a universal access transceiver (UAT) subsystem configured for detecting and responding to an interrogation signal by broadcasting a signal representing a vehicle parameter. The interrogation signal can be detected by monitoring current fluctuations in a power bus on the vehicle. The UAT subsystem is connected to a smart antenna configured for transmitting and receiving ADS-B signals. In an aircraft (A/C) application the vehicle parameter can comprise squawk code, altitude, heading vector, airspeed and other flight data.

A system for front end protection of an RF receiver against interfering pulsed high power RF signals includes a dual-diode device comprising a first Transient Voltage Suppressor (TVS) diode; and a second TVS diode; wherein the first TVS diode and the second TVS diode are located between an RF input/output and an RF receiver front end.

A system for front end protection of an RF receiver against interfering pulsed high power RF signals includes a dual-diode device comprising a first Transient Voltage Suppressor (TVS) diode; and a second TVS diode; wherein the first TVS diode and the second TVS diode are located between an RF input/output and an RF receiver front end.