Test assembly and method for testing a radar sensor

1 . A test assembly for testing a radar sensor, comprising:

a receptacle in which the radar sensor is disposed, wherein the radar sensor is configured to transmit a radar signal;

at least one receive antenna configured to receive the radar signal;

at least two transmit antennas each configured to transmit one reflection signal, wherein a superposition signal, which is a superposition of the reflection signals is receivable by the radar sensor, wherein the test assembly comprises more transmit antennas than receive antennas; and

a computer configured to:

ascertain, based on the received radar signal, at least one parameter of respective reflection signals to be transmitted by the at least two transmit antennas, wherein ascertaining the at least one parameter of the respective to-be-transmitted reflection signals comprises ascertaining respective amplitudes of the respective to-be-transmitted reflection signals, wherein an amplitude ratio of the respective amplitudes simulates an antenna being provided at a virtual position and a virtual direction from which the superposition signal is received by the radar sensor; and

transfer the respective to-be-transmitted reflection signals to the at least two transmit antennas;

wherein ascertaining the at least one parameter of the respective to-be-transmitted reflection signals takes into account respective signal paths between the computer and respective transmit antennas.

2 . The test assembly according to claim 1 , wherein the superposition signal is capable of simulating an environment capturable by the radar sensor.

3 . The test assembly according to claim 2 , wherein the simulatable environment comprises one or more objects capturable by the radar sensor.

4 . The test assembly according to claim 2 , wherein the environment is capable of being simulated in such a manner as to change over time.

5 . The test assembly according to claim 2 , wherein the computer is configured to ascertain the at least one parameter of the respective to-be-transmitted reflection signals on the basis of stored data, wherein the stored data comprise information on the simulatable environment.

6 . The test assembly according to claim 2 , wherein the computer is configured to ascertain the at least one parameter of the respective to-be-transmitted reflection signals on the basis of received data.

7 . The test assembly according to claim 1 , wherein the test assembly is configured such that each of the reflection signals are transmitted by a respective pair of two adjacent transmit antennas.

8 . The test assembly according to claim 1 , wherein the computer is configured to ascertain a phase position as a parameter of the respective to-be-transmitted reflection signals.

9 . The test assembly according to claim 8 , wherein the computer is configured to ascertain the phase position such that the ascertained phase position is the same for the to-be-transmitted respective to-be-transmitted reflection signals.

10 . The test assembly according to claim 1 , wherein taking into account respective signal paths between the computer and respective transmit antennas relates to phase positions of the respective to-be-transmitted reflection signals.

11 . A method for testing a radar sensor, comprising:

transmitting, by the radar sensor, a radar signal, wherein the radar sensor is disposed in a receptacle;

receiving, by at least one receive antenna, the radar signal;

ascertaining, by a computer, based on the received radar signal, at least one parameter of respective reflection signals to be transmitted by the at least two transmit antennas, wherein ascertaining the at least one parameter of the respective to-be-transmitted reflection signals comprises ascertaining respective amplitudes of the respective to-be-transmitted reflection signals, wherein an amplitude ratio of the respective amplitudes simulates an antenna being provided at a virtual position and a virtual direction from which a superposition signal is received by the radar sensor, and wherein ascertaining the at least one parameter of the respective to-be-transmitted reflection signals takes into account respective signal paths between the computer and respective transmit antennas;

transferring, by the computer, the respective to-be-transmitted reflection signals to the at least two transmit antennas;

transmitting, by each of at least two transmit antennas, one reflection signal to the radar sensor, wherein a quantity of receive antennas corresponding to the at least one receive antenna is less than a quantity of transmit antennas corresponding to the at least two transmit antennas, and wherein the transmitted reflection signals form the superposition signal; and

receiving, by the radar sensor, the superposition signal.

12 . The method according to claim 11 , wherein an environment which is capturable by the radar sensor is simulated by the superposition signal.

13 . The method according to claim 12 , wherein the simulated environment comprises one or more objects which are capturable by the radar sensor.

14 . The method according to claim 12 , wherein the environment is simulated in such a manner as to change over time.

15 . The method according to claim 11 , wherein the computer ascertains the at least one parameter of the respective to-be-transmitted reflection signals on the basis of stored data, wherein the stored data comprise information on the simulated environment.

16 . The method according to claim 11 , wherein the computer ascertains the at least one parameter of the respective to-be-transmitted reflection signals on the basis of received data.

17 . The method according to claim 11 , wherein the computer ascertains a phase position as a parameter of the respective to-be-transmitted reflection signals.

18 . The method according to claim 17 , wherein the transmitted reflection signals are transmitted at the same phase position.