DE102016121296A1 - Apparatus and method for simulating radar targets - Google Patents

Abstract

Device for simulating radar targets with a receiving antenna (2) for receiving an HF signal, in particular a frequency modulated continuous wave radar signal from a radar, comprising a local oscillator (4) for generating a local oscillator signal, comprising a down-converter (3) for mixing the received RF signal A signal comprising the local oscillator signal for generating a first analog intermediate frequency signal, comprising an ADC (5) for digitizing the first intermediate frequency signal, comprising an electronic circuit (1) for processing the first digitized intermediate frequency signal into a second digitized intermediate frequency signal, with a DAU (6) for conversion the second digitized intermediate frequency signal into a second intermediate frequency analog signal, with an up mixer (7) for generating a transmission signal from the local oscillator signal and the second intermediate frequency analog signal, with a transmitting antenna (8) for transmitting the transmission signal, the elek tronic circuit (1) has at least one adjustable first dead time element (14a, 14b) with which a first transit time between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable for simulating a distance of the radar target from the radar device and wherein the electronic circuit (1) at least an adjustable first multiplication element (15a, 15b) with which a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable for simulating a speed of the radar target to the radar device, wherein the electronic circuit (1) has a second multiplication element (13) with which a second frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable or set to the transit time differences between the received radar signal and the transmission signal except that the first multiplier (1) is adjustable or set thereto, or that the electronic circuit (1) has a second delay element with which a second delay between the second digital intermediate frequency signal and the first digital Intermediate frequency signal is adjustable or adjusted to compensate for the transit time differences between the received radar signal and the transmission signal except for the first delay set with the first delay timer, or that the first deadtime element is adjustable or set to.

Description

• - mit einer Empfangsantenne zum Empfangen eines HF-Signals, insbesondere eines frequenzmodulierten Dauerstrich-Radarsignals von einem Radargerät,
• - mit einem ersten Lokaloszillator zur Erzeugung eines ersten Lokaloszillatorsignals,
• - mit einem Abwärtsmischer zum Mischen des empfangenen HF-Signals mit dem ersten Lokaloszillatorsignal zur Erzeugung eines ersten analogen Zwischenfrequenzsignals,
• - mit einem ADU zur Digitalisierung des ersten Zwischenfrequenzsignals,
• - mit einer elektronischen Schaltung zur Verarbeitung des ersten digitalisierten Zwischenfrequenzsignals zu einem zweiten digitalisierten Zwischenfrequenzsignal,
• - mit einem DAU zur Umsetzung des zweiten digitalisierten Zwischenfrequenzsignals in ein zweites analoges Zwischenfrequenzsignal,
• - mit einem Aufwärtsmischer zur Erzeugung eines Sendesignals aus dem ersten Lokaloszillatorsignal und dem zweiten analogen Zwischenfrequenzsignal,
• - mit einer Sendeantenne zum Senden des Sendesignals,
• - wobei die elektronische Schaltung ein einstellbares erstes Totzeitglied aufweist, mit dem zur Simulation einer Entfernung des Radarziels vom Radargerät eine erste Laufzeit zwischen dem zweiten digitalen Zwischenfrequenzsignal und dem ersten digitalen Zwischenfrequenzsignal einstellbar ist und
• - wobei die elektronische Schaltung ein einstellbares erstes Multiplikationsglied aufweist, mit dem zur Simulation einer Geschwindigkeit des Radarziels zum Radargerät eine erste Frequenzveränderung zwischen dem zweiten digitalen Zwischenfrequenzsignal und dem ersten digitalen Zwischenfrequenzsignal einstellbar ist.

The invention relates to a device for simulating radar targets

• with a receiving antenna for receiving an HF signal, in particular a frequency-modulated continuous wave radar signal from a radar device,
• with a first local oscillator for generating a first local oscillator signal,
• with a down mixer for mixing the received RF signal with the first local oscillator signal to produce a first analog intermediate frequency signal,
• with an ADU for digitizing the first intermediate frequency signal,
• with an electronic circuit for processing the first digitized intermediate frequency signal into a second digitized intermediate frequency signal,
• with a DAU for converting the second digitized intermediate-frequency signal into a second analog intermediate-frequency signal,
• with an up-converter for generating a transmission signal from the first local oscillator signal and the second intermediate frequency analog signal,
• with a transmitting antenna for transmitting the transmission signal,
• - wherein the electronic circuit has an adjustable first deadtime element, with the simulation of a distance of the radar target from the radar device, a first transit time between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable and
• - wherein the electronic circuit has an adjustable first multiplier element, with which a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable to simulate a speed of the radar target to the radar device.

As an alternative to the device of the type mentioned at the outset, the invention also relates to a device which differs from the device of the type mentioned above in that it has no first dead-time element and instead with the adjustable first multiplication element for simulating a speed of the radar target to the radar device. or to simulate a distance of the radar target from the radar device, a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable.

In a further alternative device, the first oscillator signal is not used for up-mixing (preamble of claim 14).

Radar devices, in particular continuous wave radars, are indispensable in modern motor vehicles. Radar devices, in particular continuous wave radars, are used in particular to detect obstacles in the near or further surroundings. The obstacles may be other moving or stationary road users, including pedestrians, but also stationary objects. Depending on the use of the radar devices, in particular continuous wave radars, not only the distance, but also the speed of the road user must be determined.

Frequency-modulated continuous wave radar is often used to determine both distance and velocity. This has already been described in various documents.

The radars, in particular continuous wave radars, which are incidentally manufactured in large numbers due to the frequent installation in motor vehicles, must be tested before and / or after installation. In such tests, devices of the type mentioned above are used to simulate targets to be detected by the radars. For this purpose, the radar devices and the devices for simulating radar targets, also called radar target generators, are placed in a radar chamber. The simulating devices are placed immediately in front of the radars.

The known devices for simulating have in common that they mix down the received from the radar high-frequency radar signals in a first intermediate frequency signal and the further processing takes place in the baseband. The further processing changes the first intermediate frequency signal thus, in that the second intermediate frequency signal resulting from the first intermediate frequency signal after the processing for simulating the Doppler effect or the speed of the radar target has a frequency change and / or for simulating the distance of the radar target has a propagation delay with respect to the first intermediate frequency signal. Subsequently, the second intermediate frequency signal is up-converted and the resulting high-frequency transmission signal is sent back to the radar unit via the transmitting antenna. The radar receives the transmission signal. From a comparison with the signal emitted by it, the radar can detect the frequency change and the transit time difference and determines the distance and the speed of the simulated radar target.

In the devices for simulating, for example, due to the signal processing, there are running times that can not be avoided. They arise u.a. by the signal processing in the devices. This, the devices for simulating inherent running times cause the radar device to be measured always a minimum target distance is measured, even if the adjustable first dead time no runtime set (runtime = 0) or no runtime offset between the second intermediate frequency signal and the first intermediate frequency signal set is.

Assuming, for example, that the transit time of the device for simulating is 100 ns, a simulated path of the radar signal from the radar to the simulated radar target and back to the radar device of 100 ns * c ₀ = 30 m (c ₀ : speed of light). As the measured distance for radar devices is twice the distance, the radar detects a distance of at least 15 m (minimum target distance 15 m).

The minimum aiming distance results in the radar device for radar targets less than 15 meters from the radar device being unable to be tested with the simulating device.

To eliminate this distance limit, set the inventor's goal.

• - dass die elektronische Schaltung ein zweites Multiplikationsglied aufweist, mit dem eine zweite Frequenzveränderung zwischen dem zweiten digitalen Zwischenfrequenzsignal und dem ersten digitalen Zwischenfrequenzsignal einstellbar oder eingestellt ist, um die Laufzeitunterschiede zwischen dem empfangenen Radarsignal und dem Sendesignal mit Ausnahme der mit dem ersten Totzeitglied eingestellten ersten Laufzeit auszugleichen, oder
• - dass das erste Multiplikationsglied dazu einstellbar oder eingestellt ist.

This goal is achieved by

• - That the electronic circuit comprises a second multiplier, with which a second frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable or set to the transit time differences between the received radar signal and the transmission signal except for the set with the first deadtime first term to balance, or
• - That the first multiplier is adjustable or set to.

The invention is based on the following consideration:

The frequency-time behavior of a portion of a frequency modulated continuous wave radar signal, a so-called FMCW chirp, is f (t) = f ₀ + a * t. If such a section, ie an FMCW chirp, has a bandwidth of 100 MHz and a duration of 100 μs, then a = 1 MHz / μs.

Taking the previously discussed example, the 100ns inherent run time of the device for simulating results in a frequency change between the received signal and the transmit signal of df = -a * 100ns = -100kHz. This frequency change of -100kHz detects the radar and determines the distance of 15 m of the simulated radar target.

However, since the frequency change resulting from the inherent transit time of the device is compensated during processing in the device according to the invention, namely by the second multiplication element or the first multiplication element, the device according to the invention can also be used to zero the simulated radar target of the device Radar device are simulated.

• - dass die elektronische Schaltung einen zweiten Lokaloszillator zur Erzeugung eines zweiten Lokaloszillatorsignals aufweist,
• - dass mit dem Aufwärtsmischer aus dem zweiten Lokaloszillatorsignal und dem zweiten analogen Zwischenfrequenzsignal das Sendesignal erzeugbar ist,
• - dass der zweiten Lokaloszillator so einstellbar ist, dass das zweite Lokaloszillatorsignal eine Frequenzdifferenz zum ersten Lokaloszillatorsignal hat, mit der eine zweite Frequenzveränderung zwischen dem Sendesignal und dem empfangenen Radarsignal eingestellt ist, um die Laufzeitunterschiede zwischen dem empfangenen Radarsignal und dem Sendesignal mit Ausnahme der mit dem ersten Totzeitglied eingestellten ersten Laufzeit auszugleichen.

As a result, the same can be achieved by a device according to claim 14. This device differs from the prior art according to the preamble of claim 14 in that

• - That the electronic circuit has a second local oscillator for generating a second local oscillator signal,
• that the transmission signal can be generated with the up-converter from the second local oscillator signal and the second analog intermediate-frequency signal,
• - that the second local oscillator is adjustable so that the second local oscillator signal has a frequency difference from the first local oscillator signal with which a second frequency change between the transmit signal and the received radar signal is adjusted to the skew differences between the received radar signal and the transmit signal except that with the first Deadtime element adjusted first time to compensate.

The inherent transit time of the device is compensated in accordance with these alternatives by up-converting with the second oscillator signal different from the first oscillator signal. The difference between the frequencies of the local oscillators and the local oscillator signals differs as possible to the frequency change, which results for a time due to the inherent transit time between the received radar signal and the transmission signal.

The dead-time elements and multiplication elements and all other elements or components of the electronic circuit mentioned below can be realized as discrete components, parts of an integrated circuit or as software modules or procedures.

The electronic circuit may be a digital signal processor (DSP) or a logic circuit, in particular an FPGA. The electronic circuit is preferably an integrated circuit. The integrated circuit may in particular be an ASIC.

The electronic circuit of a device according to the invention may have more than one adjustable first dead-time element and more than one adjustable first multiplication element to simulate more than one radar target, wherein the first dead-time elements are connected in parallel and the first multiplication elements are connected in parallel. If more than one adjustable first dead time element and more than one adjustable first multiplication element are provided in order to simulate a plurality of radar targets, the compensation of the device's inherent transit time by the second multiplication element or the second dead time element is preferably done before the manipulation of the signal by the first multiplication elements and / / or the first dead time members made, each of which the same signal is supplied. The signals manipulated by the first multipliers and the first delay elements may be added to produce the second digital intermediate frequency signal.

In a first preferred variant of the device according to the invention, the mixers for downmixing and upmixing RF mixers and / or the ADU and the DAU may be single-channel ADUs and -DAUs.

If an RF down converter and a single-channel ADU are used, a real-valued signal is produced. According to the invention, a Hilbert transformation of the first digitized intermediate frequency signal can be carried out with the electronic circuit of the device in order to generate a complex-valued signal from the real-valued first digitized intermediate-frequency signal.

An electronic circuit of a device according to the invention may comprise an equalizer with which the amplitude error of the Hilbert transformation can be compensated. Furthermore, the electronic circuit may include an FIR filter. Depending on how accurate the Hilbert transform is, the equalization by means of the equalizer and the FIR filtering may also be omitted.

According to the invention, the second multiplication element can be suitable and set up for a complex-valued multiplication of the complex-valued signal which may be equalized by the equalizer and / or optionally FIR-filtered.

In a second preferred variant of the apparatus according to the invention, the mixers for downmixing and upmixing may be IQ mixers or SSB mixers and the ADU and the DAU two-channel ADUs and two-channel DAUs, respectively.

According to the invention, the electronic circuit can be suitable and set up for an IQ error compensation of the first digitized intermediate frequency signal.

The second multiplier may be suitable and arranged according to the invention for a complex-valued multiplication of the compensated first digitized intermediate-frequency signal. The electronic circuit of the device according to the invention in the second variant may be suitable for a Q-error predistortion and set up.

• - bei dem mit einer Empfangsantenne ein frequenzmoduliertes Dauerstrich-Radarsignal von einem Radargerät empfangen wird,
• - bei dem mit einem Lokaloszillator ein Lokaloszillatorsignal erzeugt wird,
• - bei dem mit einem Abwärtsmischer das empfangene Radarsignal mit dem Lokaloszillatorsignal zur Erzeugung eines ersten analogen Zwischenfrequenzsignals gemischt wird,
• - bei dem mit einem ADU das erste Zwischenfrequenzsignal digitalisiert wird,
• - bei dem mit einer elektronischen Schaltung das erste digitalisierte Zwischenfrequenzsignal zu einem zweiten digitalisierten Zwischenfrequenzsignal verarbeitet wird,
• - bei dem mit einem DAU das zweite digitalisierte Zwischenfrequenzsignal in ein zweites analoges Zwischenfrequenzsignal umgesetzt wird,
• - bei dem mit einem Aufwärtsmischer aus dem Lokaloszillatorsignal und dem zweiten analogen Zwischenfrequenzsignal ein Sendesignal erzeugt wird,
• - bei dem mit einer Sendeantenne das Sendesignal gesendet wird,
• - bei dem mit wenigstens einem einstellbaren ersten Totzeitglied der elektronischen Schaltung zur Simulation einer Entfernung des Radarziels vom Radargerät eine erste Laufzeit zwischen dem zweiten digitalen Zwischenfrequenzsignal und dem ersten digitalen Zwischenfrequenzsignal einstellbar ist, und
• - bei dem mit wenigstens einem einstellbaren ersten Multiplikationsglied der elektronischen Schaltung zur Simulation einer Geschwindigkeit des Radarziels zum Radargerät eine erste Frequenzveränderung zwischen dem zweiten digitalen Zwischenfrequenzsignal und dem ersten digitalen Zwischenfrequenzsignal einstellbar ist.

A method is known for simulating radar targets,

• in which a frequency-modulated continuous-wave radar signal is received by a radar device with a receiving antenna,
• in which a local oscillator signal is generated with a local oscillator,
• in which, with a down-converter, the received radar signal is mixed with the local oscillator signal to produce a first analog intermediate-frequency signal,
• in which the first intermediate frequency signal is digitized with an ADU,
• in which, with an electronic circuit, the first digitized intermediate frequency signal is processed into a second digitized intermediate frequency signal,
• in which, with a DAU, the second digitized intermediate-frequency signal is converted into a second analog intermediate-frequency signal,
• in which a transmission signal is generated with an up-converter from the local oscillator signal and the second analog intermediate-frequency signal,
• in which the transmission signal is sent with a transmission antenna,
• - In which at least one adjustable first dead time of the electronic circuit for simulating a removal of the radar target from the radar device, a first transit time between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable, and
• - In which with at least one adjustable first multiplication element of the electronic circuit for simulating a speed of the radar target to the radar device, a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable.

• - dass mit einem zweiten Multiplikationsglied der elektronischen Schaltung eine zweite Frequenzveränderung zwischen dem zweiten digitalen Zwischenfrequenzsignal und dem ersten digitalen Zwischenfrequenzsignal eingestellt wird oder eingestellt ist, um die Laufzeitunterschiede zwischen dem empfangenen Radarsignal und dem Sendesignal mit Ausnahme der mit dem ersten Totzeitglied eingestellten ersten Laufzeit auszugleichen, oder
• - dass das erste Multiplikationsglied dazu eingestellt wird oder eingestellt ist.

According to the invention, this known method, in order to compensate a transit time inherent in the device, is now developed by

• a second frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjusted or adjusted with a second multiplication element of the electronic circuit in order to compensate for the transit time differences between the received radar signal and the transmission signal, with the exception of the first transit time set with the first deadtime element, or
• - That the first multiplier is set or is set.

• 1 ein Blockschaltbild einer erfindungsgemäßen Vorrichtung der ersten Variante und
• 2 eine Darstellung der Funktionen einer integrierten Schaltung der erfindungsgemäßen Schaltung.

Reference to the accompanying drawings, the invention is explained in more detail below. Showing:

• 1 a block diagram of a device according to the invention of the first variant and
• 2 a representation of the functions of an integrated circuit of the circuit according to the invention.

empfangen wird, wobei a die Änderung der Frequenz während eines FMCW-Chirps ist. Dieses Radarsignal wird einem einfachen Abwärtsmischer 3 zugeleitet, in dem das empfangene hochfrequente Radarsignal mit einem von einem Lokaloszillator 4 erzeugten Signal mit der Frequenz f_LO0 gemischt wird. Die Mischung ergibt ein $${\text{erstes analoges Zwischenkreissignal f}}_{\text{TG}\_\text{Rx}}\left(\text{t}\right)={\text{f}}_0-{\text{f}}_{\text{LO}0}+\text{a}*\text{t}\text{,}$$

das in einem einfachen Analog-Digital-Umsetzer (ADU) 5 in ein erstes digitales Zwischenkreissignal umgesetzt wird.The device according to the invention for simulating radar targets A, B, in its first variant, has a transmitting antenna 2 on, with a radar device arranged directly in front of the device according to the invention $${\text{transmitted FMCW radar signal f}}_{\text{TX}\_\text{radar}}\left(\text{t}\right)={\text{f}}_{\text{0}}+\text{a}*\text{t}$$

where a is the change in frequency during an FMCW chirp. This radar signal becomes a simple down-converter 3 in which the received high-frequency radar signal with one of a local oscillator 4 generated signal is mixed with the frequency f _LO0 . The mixture results $${\text{first analog intermediate circuit signal f}}_{\text{TG}\_\text{Rx}}\left(\text{t}\right)={\text{f}}_0-{\text{f}}_{\text{LO}0}+\text{a}*\text{t}\text{.}$$

that in a simple analog-to-digital converter (ADC) 5 is converted into a first digital intermediate circuit signal.

ergibt, das von einer Sendeantenne 8 der Vorrichtung an das Radargerät zurückgesendet wird. Die von dem FPGA 1 vorgenommenen Änderungen spiegeln sich in den Koeffizienten f_comp, f_dopp,a, f_dopp,b, т_a und т_b wieder. This first digital DC link signal becomes an FPGA 1 fed in which different functions 10 . 11 . 12 . 13 . 14a . 15a . 14b . 15b , 16 are realized. The functions change the first digital DC link signal. Finally, a second digital DC link signal is generated at an output of the FPGA 1 provided. The second digital DC link signal becomes a DAU 6 which converts it into a second analog intermediate circuit signal from an up-converter 7 is mixed with the local oscillator signal, causing a $${\text{Transmission signal f}}_{\text{TG}\_\text{Tx}}\left(\text{t}\right)={\text{f}}_{\text{0}}-{\text{f}}_{\text{LO0}}+{\text{f}}_{\text{comp}}-\text{a}\left(\text{t}-{т}_{\text{i}}-{т}_{\text{a}}-{т}_{\text{b}}\right)-{\text{f}}_{\text{handle double}\text{, a}}-{\text{f}}_{\text{handle double}\text{, b}}+{\text{f}}_{\text{LO0}}$$

results from a transmitting antenna 8th the device is sent back to the radar device. The one from the FPGA 1 Changes made are reflected in the coefficients f _comp , f _{dopp, a} , f _{dopp, b} , т _a and т _b .

These coefficients describe, on the one hand, the adjustment, known from the prior art, of a distance and a speed of-in the example-two simulated radar targets A and B.

This is done with first deadtime elements 14a . 14b simulates a transit time т _a , т _b , which has the signal sent by the radar to the radar target A and B plus the duration of the echo from the radar targets A and B to the radar.

With two first multipliers 15a . 15b For example, a Doppler shift about the frequencies f _{dopp, a} , f _{dopp, b can be} simulated, with which a speed of the radar targets A, B is simulated.

New is the second multiplication element, which performs a further frequency shift f _comp . This compensates for the inherent transit time τ _i between the reception of the radar signal from the radar device via the receiving antenna 2 until the transmission of the transmission signal via the transmitting antenna 8th passes.

So that signal processing can take place within the FPGA as described, the first digital intermediate circuit signal, which is a real-valued signal, must first be converted. This will be a Hilbert transformation 10 in order to generate a complex-valued signal from the real-valued signal. To minimize errors in the Hilbert transform, it may be necessary, after the transformation, to correct amplitude errors by an equalization 11 Equalize by means of an equalizer or with an FIR filter 12 Suppress energy on the negative frequency axis. After filtering, a complex-valued signal is ready for further digital processing in FPGA.

LIST OF REFERENCE NUMBERS

1

FPGA

10

Hilbert transform

11

equalization

12

FIR filtering

13

Compensation of the device inherent running time

14a

First idle timer for setting the distance of the radar target A

14b

First idle timer for setting the distance of the radar target B

15a

First multiplier for setting the speed of the radar target A

15b

First multiplier for setting the speed of the radar target B

2

receiving antenna

3

downconverter

4

local oscillator

5

ADU

6

DAU

7

upconverter

8th

transmitting antenna

Claims (14)

Device for simulating radar targets - having a receiving antenna (2) for receiving an HF signal, in particular a frequency-modulated continuous wave radar signal, from a radar device, - having a first local oscillator (4) for generating a first local oscillator signal, - a downwards mixer (3 ) for mixing the received RF signal with the first local oscillator signal to produce a first analog intermediate frequency signal, - with an ADC (5) for digitizing the first intermediate frequency signal, - with an electronic circuit (1) for processing the first digitized intermediate frequency signal to a second digitized Intermediate frequency signal, - with a DAU (6) for converting the second digitized intermediate frequency signal into a second analog intermediate frequency signal, - with an up mixer (7) for generating a transmission signal from the first local oscillator signal and the second analog intermediate frequency signal, - with a Sendea antenna (8) for transmitting the transmission signal, - wherein the electronic circuit (1) either ○ at least one adjustable first dead time (14a, 14b), with the simulation of a distance of the radar target from the radar device a first transit time between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable and ○ has at least one adjustable first multiplication element (15a, 15b) with which a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable for simulating a speed of the radar target to the radar device, or electronic circuit has at least one adjustable first multiplication element, with which for simulating a speed of the radar target to the radar device and / or for simulating a removal of the radar target from the radar device, a first frequency change between the second digita len intermediate frequency signal and the first digital intermediate frequency signal is adjustable, characterized in that - the electronic circuit (1) comprises a second multiplier (13), with which a second frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable or set to to compensate for the differences in transit time between the received radar signal and the transmission signal except for the first delay set with the first deadtime element, or that the first multiplication element (1) is adjustable or adjusted for this purpose. Device after Claim 1 , characterized in that the electronic circuit (1) is a DSP, an FPGA or an ASIC. Device after Claim 1 or 2 characterized in that the electronic circuit (1) has more than one adjustable first dead time member (14a, 14b) and more than one adjustable first multiplier (15a, 15b) to simulate more than one radar target, the first dead time members (14a , 14b) are connected in parallel and the first multiplication elements (15a, 15b) are connected in parallel. Device according to one of Claims 1 to 3 characterized in that the mixers (3, 7) for downmixing and upmixing are simple mixers and the ADU (5) and DAU (6) are simple ADUs and DAUs. Device after Claim 4 , characterized in that with the electronic circuit (1) a Hilbert transform (10) of the first digitized intermediate frequency signal is feasible to generate a complex-valued signal from the first digitized intermediate frequency signal. Device after Claim 5 , characterized in that the electronic circuit (1) comprises an equalizer (11) can be compensated with the amplitude error of the Hilbert transform. Device after Claim 5 or 6 , characterized in that the electronic circuit (1) comprises a FIR filter (12). Device according to one of Claims 5 to 6 , characterized in that the second multiplication element (13) is suitable and set up for a complex-valued multiplication of the complex-valued signal possibly modified by the equalizer (11) and / or optionally FIR-filtered. Device according to one of Claims 1 to 3 Characterized in that the mixer (3, 7) for down-converting and up-converting mixer with the I output and Q output and the ADC (5) and the DAC (6) are dual-ADUs and Dual DACs. Device after Claim 9 , characterized in that the electronic circuit (1) for an IQ error compensation of the first digitized intermediate frequency signal is suitable and arranged. Device after Claim 10 , characterized in that the second multiplication element is suitable and set up for a complex-valued multiplication of the compensated first digitized intermediate-frequency signal. Device after Claim 11 , characterized in that the electronic circuit is suitable and arranged for IQ error predistortion. A method for simulating radar targets, wherein - with a receiving antenna (2) an RF signal, in particular a frequency modulated continuous wave radar signal, is received by a radar, - with a first local oscillator (4) a first local oscillator signal is generated, - a downmixer (3) the received RF signal is mixed with the first local oscillator signal to produce a first analog intermediate frequency signal, - wherein the first intermediate frequency signal is digitized with an ADC (5), - with an electronic circuit (1) the first digitized intermediate frequency signal is processed to a second digitized intermediate frequency signal, - wherein with a DAU (6) the second digitized intermediate frequency signal is converted into a second analog intermediate frequency signal, - with an up mixer (7) from the first local oscillator signal and the second analog intermediate frequency signal generates a transmission signal wi wherein - with at least one adjustable first dead time element (14a, 14b) of the electronic circuit (1) for simulating a removal of the radar target from the radar device, a first transit time between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable, and - with at least one adjustable first multiplier (15a, 15b) of the electronic circuit (1) for simulating a speed of the radar target to the radar device, a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal adjustable is characterized in that - with a second multiplier (13) of the electronic circuit (1) a second frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is set or is set, u m to compensate for the differences in transit time between the received radar signal and the transmission signal, with the exception of the first delay set with the first deadtime element (14a, 14b), or - that the first multiplication element is set or set to. Device for simulating radar targets - having a receiving antenna for receiving an RF signal, in particular a frequency-modulated continuous wave radar signal from a radar device, having a first local oscillator for generating a first local oscillator signal, having a down-converter for mixing the received RF signal with the first first local oscillator signal for generating a first analog intermediate frequency signal, - with an ADU for digitizing the first intermediate frequency signal, - with an electronic circuit for processing the first digitized intermediate frequency signal to a second digitized intermediate frequency signal, - with a DAU for converting the second digitized intermediate frequency signal into a second analogue Intermediate frequency signal, - with an up-converter for generating a transmission signal, - with a transmitting antenna for transmitting the transmission signal, - wherein the electronic circuit (1) either ○ has at least one adjustable first dead time element (14a, 14b) with which a first transit time between the second digital intermediate frequency signal and the first digital intermediate frequency signal can be set to simulate a distance of the radar target from the radar device, and ○ at least one adjustable first multiplication element (15a, 15b) with which for the simulation of a speed of the radar target to the radar device, a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable, or wherein the electronic circuit has at least one adjustable first multiplication element, with which to simulate a speed of the radar target Radar device and / or for simulating a distance of the radar target from the radar device, a first frequency change between the second digital intermediate frequency signal and the first digital intermediate frequency signal is adjustable is t, characterized in that - the electronic circuit has a second local oscillator for generating a second local oscillator signal, - that with the up-converter from the second local oscillator signal and the second analog intermediate frequency signal, the transmission signal is generated, - that the second local oscillator is adjustable so that the second local oscillator signal has a frequency difference from the first local oscillator signal with which a second frequency change between the transmission signal and the received radar signal is adjusted to compensate for the transit time differences between the received radar signal and the transmission signal except for the first delay set with the first deadtime.

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