A testing device for testing a distance sensor that operates using electromagnetic waves includes: a receiving element for receiving an electromagnetic free-space wave as a receive signal (S.sub.RX); and a radiating element for radiating an electromagnetic output signal (S.sub.TX). In a test mode, a test signal unit generates a test signal (S.sub.test), and the radiating element is configured to radiate the test signal (S.sub.test) or a test signal (S′.sub.test) derived from the test signal (S.sub.test) as the electromagnetic output signal (S.sub.TX). In the test mode, an analysis unit is configured to analyze the receive signal (S.sub.RX) or the derived receive signal (S′.sub.RX) in terms of its phase angle (Phi) and/or amplitude (A) and store a determined value of phase angle (Phi) and/or amplitude (A) synchronously with the radiation of the test signal (S.sub.test) or of the derived test signal (S′.sub.test) as the electromagnetic output signal (S.sub.TX).

Accuracy for detecting and tracking one or more objects of interest can be improved using radar-based tracking systems. In some examples, multiple radars implemented in a device can be used to transmit signals to, and receive signals from, the one or more objects of interest. To disambiguate an object of interest from undesired objects such as the hand of a user, the object of interest can include a transponder that applies a delay element to a signal received from a radar, and thereafter transmits a delayed return signal back to the radar. The delay produced by the delay element can separate the return signal from undesired reflections and enable disambiguation of those signals. Clear identification of the desired return signal can lead to more accurate object distance determinations, more accurate triangulation, and improved position detection and tracking accuracy.

A method of interrogating an acoustic wave sensor comprises transmitting, by an interrogator, an interrogation radiofrequency signal to the acoustic wave sensor by way of a transmission antenna, receiving, by the interrogator, a response radiofrequency signal from the acoustic wave sensor by way of a reception antenna, and processing by a processing means of the interrogator the received response radiofrequency signal to obtain in-phase and quadrature components both in the time domain and the frequency domain, determining by the processing means perturbations of the obtained in-phase and quadrature components both in the time domain and the frequency domain and determining by the processing means a value of a measurand based on the detected perturbations.

A method for simulating a trajectory of a radar target includes the procedures of determining a simulated trajectory of the simulated target and determining a simulating vehicle trajectory for a simulating vehicle. The simulating vehicle trajectory is defined according to a simulation profile. The simulation profile at least includes a spatial simulation profile and a signal delay profile. The method further includes the procedures of maneuvering the simulating vehicle according the spatial simulation profile, receiving a radar signal by the simulating vehicle and retransmitting a signal toward the radar at least according to the signal delay profile.

An information transmission method of a mobile reception terminal that is capable of connecting to a server over a network and capable of receiving a direct wave and a reflected wave of radio waves transmitted by a transmission station that has a fixed position and transmits radio waves of a same modulation scheme continuously or periodically, includes: creating a delay profile of reception of the direct wave and the reflected wave that indicates a time difference between the direct wave and the reflected wave; and transmitting the delay profile to the server over the network.

A radar system may include (1) a wearable device, (2) a set of radar devices secured to the wearable device, wherein the set of radar devices (A) transmit radar signals to at least one transponder and (B) receive the radar signals, (3) an error-mitigation device secured to the wearable device, wherein the error-mitigation device provides data for mitigating position errors in triangulation calculations involving the radar signals, and (4) at least one processing device communicatively coupled to the set of radar devices and the error-mitigation device, wherein the processing device (A) calculates, based at least in part on roundtrip flight times of the radar signals and the data, distances between the set of radar devices and the transponder and (B) triangulates, based at least in part on the distances, a three-dimensional location of the transponder relative to the wearable device. Various other apparatuses, systems, and methods are also disclosed.

A device for calibrating a radar or an antenna and embedded on an aerial vehicle, comprising: a processing unit configured to apply a delay to an incoming electromagnetic signal, wherein the device is configured to provide said electromagnetic signal with said delay to an emitter for its back transmission, wherein the processing unit is configured to control said delay according to one or more delay values, wherein each delay value simulates a virtual range of the device or of the aerial vehicle with respect to said radar or antenna receiving said transmitted electromagnetic signal, said virtual range being different from an actual range of the device or of the aerial vehicle, for calibrating said at least one radar or antenna based on said transmitted electromagnetic signal which simulates a virtual range of the device or of the aerial vehicle with respect to said at least one radar or antenna.

In a radar system, a marker is placed in the field of view of a transceiver. The marker receives the radar signal transmitted by the transceiver and retransmits, as a function of this radar signal, a diagnostic radar signal, for example originating from reflections of the collected signal inside the marker. Then, the transceiver, while collecting and processing the signal from the field of view to detect the targets therein, checks whether the diagnostic radar signal, interpreted as a target with characteristic position and amplitude, is present. If this does not match the expected signal, a malfunction is indicated. The marker may be activated periodically, for example only when system diagnostics is required. A variety of internal configurations of the marker can change the characteristic position, to create a movable and easily identifiable dummy target.

A device for selectively reflecting an incident microwave signal or millimeter-wave signal includes multiple antennae disposed in an array. Each antenna has an input adapted to selectively receive a forward bias signal or a zero bias signal. The device also includes a diode disposed at each input of each antenna. The device also includes a switching device connected to each input, and configured to selectively apply a forward bias or zero bias to each of the diodes. In forward bias, each of the antennae detects the incident microwave signal or millimeter wave signal, and in zero bias, each of the antennae reflects the incident microwave signal or millimeter wave signal.

A power receiving-type information acquisition and transmission device is provided with one or more power receivers that receive power supply waves that can supply power, one or more power storage means that store power obtained by the power receiving means, one or more information acquisition means that acquire information by expending at least part of the aforementioned power of the power receiver and/or the power storage means, and one or more information transmission means that utilize the power from the power storage means to transmit information externally. This enables regular or steady information collection, and enables externally transmitting the information stably and remotely, on a permanent basis, i.e., either over a short or long distance.