A method of testing vehicular radar includes acquiring binary phase codes of transmitters in a radar DUT; acquiring desired FOVs and desired angular resolutions of the transmitters to determine target angles of emulated targets; calculating far field phases of a PMCW signal for binary phase states of the transmit array at each of the target angles to determine resultant phase symbol streams; calculating excess roundtrip time delay for each emulation delay, between the DUT and the emulated targets, and each setup delay between the DUT and each emulator receiver; time-shifting the resultant phase symbol streams by the excess roundtrip time delays; subtracting the time-shifted resultant phase symbol streams from the resultant phase symbol streams to obtain difference phase symbol streams; modulating a PMCW signal transmitted by the DUT by the difference phase symbol streams; and emulating the echo signals at the target angles in response to the modulated PMCW signal.

A radar system includes a transmitter including a power amplifier (PA) for amplifying a local oscillator (LO) signal, to generate an amplified signal. The radar system also includes a receiver including an IQ generator for generating an I signal based on the LO signal and for generating a Q signal based on the LO signal and a low noise amplifier (LNA) for amplifying a looped back signal, to generate a receiver signal. The receiver also includes a first mixer for mixing the receiver signal and the I signal, to generate a baseband I signal and a second mixer for mixing the receiver signal and the Q signal, to generate a baseband Q signal. Additionally, the radar system includes a waveguide loopback for guiding the amplified signal from the transmitter to the receiver as the looped back signal.

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).

The present invention relates to a radar target emulator, a test bench having such a radar target emulator, and a method for digitally processing at least one analog radar signal. The radar target emulator comprises a first conversion apparatus configured to convert the at least one analog radar signal into at least one corresponding digital radar data packet. A data processing apparatus of the radar target emulator comprises a time delay device and a modification device, wherein the time delay device is configured to provide a plurality of delayed radar data packets on the basis of the at least one digital radar data packet. The modification device is configured to provide a plurality of modified radar data packets on the basis of the plurality of delayed radar data packets, and a second conversion apparatus is configured to provide analog processed radar signals by converting the digital radar data packets processed by the data processing apparatus. A transmission apparatus comprises at least two transmitter devices which are in particular configured to transmit the analog processed radar signals provided by the second conversion apparatus.

A system and method for extending the path length of an electromagnetic wave signal traveling between apertures is disclosed. One such system may comprise N arrays having M.sub.1 through M.sub.N apertures, respectively, wherein N2, M.sub.12, and each of M.sub.2 through M.sub.N1, a substantial number of the M.sub.1 apertures in a first array is configured to send the electromagnetic wave signal to a substantial number of the M.sub.2 apertures in a second array through the M.sub.N apertures in a N-th array, the substantial number of the M.sub.2 apertures in the second array through the M.sub.N apertures in the N-th array receiving the electromagnetic wave signal from the substantial number of the M.sub.1 apertures in the first array is configured to redirect the received electromagnetic wave signal back to the substantial number of the M.sub.1 apertures in the first array, and the substantial number of the M.sub.1 apertures in the first array is further configured to send the electromagnetic wave signal to another one of the M.sub.1 apertures in the first array after receiving the redirected electromagnetic wave signal from a M.sub.N-th aperture in the N-th array.

A test system simulates a moving target for a radar system under test. The test system includes a Doppler simulation circuit, coupled to an input, to apply a frequency shift to RF pulses received on an RF signal generated by the radar system to simulate speed. A signal delay sub-system produces a delay in the RF pulses to simulate distance. A pulse detection circuit is to detect time of receipt of the RF pulses, including a first time of receipt of a falling edge of a first RF pulse. An I/O controller updates a value of the frequency shift for the Doppler simulation circuit and of the delay for the signal delay sub-system during a time period between the first RF pulse and one of a second RF pulse or a second time at which the second RF pulse should have been received in case of a missing pulse.

A radar test computing system includes a host interface coupled to a programmable input/output (I/O) controller, which is to interface with propagation path replicator (PPR) circuitry. A processing device is to detect a start signal received from the controller; receive an update request from the controller in response to detection, by the PPR circuitry, of a first radio RF pulse on a RF signal received from the radar system; retrieve scenario data of distance to and speed of the moving target for a second RF pulse expected to follow the first RF pulse; calculate, using retrieved scenario data, values of a frequency shift, a signal delay, and a signal attenuation for the second RF pulse; and send, during a time period between the first and second RF pulses, these values to the controller for use by the PPR circuitry to simulate the moving target for the second RF pulse.

A test system simulates a moving target for a radar system under test. The test system includes a Doppler simulation circuit, coupled to an input, to apply a frequency shift to RF pulses received on an RF signal generated by the radar system to simulate speed. A signal delay sub-system produces a delay in the RF pulses to simulate distance. A pulse detection circuit is to detect time of receipt of the RF pulses, including a first time of receipt of a falling edge of a first RF pulse. An I/O controller updates a value of the frequency shift for the Doppler simulation circuit and of the delay for the signal delay sub-system during a time period between the first RF pulse and one of a second RF pulse or a second time at which the second RF pulse should have been received in case of a missing pulse.

A system and method for extending the path length of an electromagnetic wave signal traveling between apertures is disclosed. One such system may comprise N arrays having M.sub.1 through M.sub.N apertures, respectively, wherein N2, M.sub.12, and each of M.sub.2 through M.sub.N1, a substantial number of the M.sub.1 apertures in a first array is configured to send the electromagnetic wave signal to a substantial number of the M.sub.2 apertures in a second array through the M.sub.N apertures in a N-th array, the substantial number of the M.sub.2 apertures in the second array through the M.sub.N apertures in the N-th array receiving the electromagnetic wave signal from the substantial number of the M.sub.1 apertures in the first array is configured to redirect the received electromagnetic wave signal back to the substantial number of the M.sub.1 apertures in the first array, and the substantial number of the M.sub.1 apertures in the first array is further configured to send the electromagnetic wave signal to another one of the M.sub.1 apertures in the first array after receiving the redirected electromagnetic wave signal from a M.sub.N-th aperture in the N-th array.

A switching device for a radar target emulator is provided comprising: at least one first switch arrangement and a second switch arrangement, each having a branching device designed to receive a first input signal and diverge it into a branch signal and a first output signal, a switch adapted to transmit the branch signal in a first switching state within the switch arrangement and to not transmit in a second switching state, and adding means designed to emit the signal transmitted in the first switching state of the switch, at least as components of a second output signal. The first switching arrangement and the second switching arrangement are interconnected in such a way that a first input signal of the second switching arrangement comprises a first output signal of the first switching arrangement, or a second input signal of the second switching arrangement comprises a second output of the first switching arrangement.