A constant false alarm rate (CFAR) device for a signal detection system is disclosed herein. The CFAR device includes a first signal selection unit and a second signal selection unit. The first signal selection unit receives a last signal of a lagging sorting array and signals of one or more lagging guard cells, selects any one of the last signal of the lagging sorting array and the signals of the one or more lagging guard cell as a test signal based on a received guard cell size, and outputs the test signal. The second signal selection unit receives the test signal and signals of one or more leading guard cells, selects any one of the test signal and the signals of the one or more leading guard cells based on the guard cell size, and transfers this selected signal to the leading sorting array.

Described and shown is a device for measuring the distance to an object, including at least two freely radiating transmitter units for transmitting an electromagnetic measuring signal, at least one receiver unit for receiving a reflection signal reflected on the object, and at least one evaluation unit. The at least one receiver unit forwards the received reflection signal to the at least one evaluation unit. The transmitter units and the at least one receiver unit re arranged within one measuring environment. The transmitter units and the at least one receiver unit have at least one common measuring frequency range. The operation of the transmitter units is coordinated so that the measuring signals transmitted by the transmitter units and the reflection signals resulting from the measuring signals can be differentiated from one another.

A radar apparatus includes: a radar transmission signal generator, which in operation, outputs a plurality of radar signals; a switching controller, which in operation, switches among plurality of transmitting antennas in sequence in a determined order to every one radar signal transmission period; and a radio transmitter, which in operation, transmits one radar signal every one radar signal transmission period through a allocated transmitting antenna to which switching has been made. A plurality of transmission timings at which the allocated transmitting antennas to which switching have been made transmit each of the plurality of radar signals within a determined period have identical time differences from a reference timing within the determined period.

A radar sensing system includes at least one transmitter, at least one receiver and a processor. The at least one transmitter transmits a power shaped RF signal. The transmitted RF signal decreases in power over time. The at least one receiver receives a reflected RF signal. The reflected RF signal is the transmitted RF signal reflected from targets in the environment. The reflected RF signal is down-converted and the result provided to the processor. The processor samples the down-converted reflected RF signal during a plurality of time intervals to produce a sampled stream. The different time intervals of the plurality of time intervals will contain different signal levels of RF signals reflected from the targets. The processor also selects samples in the sampled stream over a selected time interval of the plurality of time intervals that is free of RF signals reflected off of near targets.

In a method and a device for operating a first vehicle, a method includes receiving a signal from an external processing unit for influencing a first surroundings sensor system of the first vehicle, influencing the first surroundings sensor system dependent on the received signal, receiving surroundings data values detected by at least one second surroundings sensor system of a second vehicle and that at least partially represent surroundings of the first vehicle, and operating the first vehicle dependent on the influence of the first surroundings sensor system and the received surroundings data values.

An interference removal filter that includes a combination of a first filter and a second filter, where the first filter passes signals over a frequency range of size B with a variation of less than +/−3 dB, where the peak value of the impulse response of the second filter is displaced in time from the peak value of the impulse response of the first filter by at least 2/B time units, and where the combination of the first filter and the second filter produces a notch in frequency at a frequency location within the frequency range.

A radar sensor having a signal generating device which generates an outgoing signal as a radar signal that is to be emitted. The radar sensor also has a signal receiving device for receiving and processing received signals as reflected radar signals. The received signals can be processed with a prediction method in order to determine a predicted signal, which can be compared to the received signal in order to eliminate disruptions deviating therefrom.

A radar device 10, mounted on a vehicle A, for repeatedly performing a measurement of a target at every predetermined measurement interval, comprising a transmitting and receiving part 14 for, in each of the measurement events, transmitting a measurement wave P, and receiving a reflection wave R thereof as a detection wave, and a controller 12 for controlling the transmitting and receiving part 14, wherein the controller 12 is configured to control the transmitting and receiving part 14 so that at least one of a length (T.sub.1, T.sub.2) of each of the measurement intervals and a signal strength (I.sub.1, I.sub.2) of each of the measurement waves P is changed with time.

A radar transmitter Tx.sub.s (s=1) generates a baseband transmission signal by modulating a first code sequence having a prescribed code length on the basis of a first transmission timing signal and gives a first transmission phase shift corresponding to each transmission cycle to the transmission signal. A radar receiver Tx.sub.s (s=2) generates a baseband transmission signal by modulating a second code sequence having the prescribed code length on the basis of a second transmission timing signal and gives, to the transmission signal, a second transmission phase shift that correspond to each transmission cycle and opposite to the first transmission phase.

Radar transmitter includes a plurality of transmit antennas that transmit a plurality of transmission signals using a multiplexing transmission, and a transmission circuit. The transmission circuit applies phase rotation amounts corresponding to combinations of Doppler shift amounts and code sequences to the plurality of transmission signals. Each of the combinations of the Doppler shift amounts and the code sequences has at least one different from other combination. The number of multiplexes of the code sequence corresponding to at least one of the Doppler shift amounts in the combinations is different from the number of multiplexing of code sequences corresponding to the remaining Doppler shift amounts.