Radar module, radar system and method for operating a radar module

Abstract

The invention relates to a radar module for a radar system, wherein the radar system operates in a predefined frequency band, the radar module having: a receiver device configured to receive radar jamming signals in the predefined frequency band during a receiving time period; an analysis processing device configured to analyze the frequency spectrum of the received radar jamming signals, wherein the analysis processing device is configured to convert the detected radar jamming signals during the receiving time period into a time signal, wherein a time course of the time signal corresponds to a frequency change or a frequency range change of the received radar jamming signals. A matched filter filters the time signal, wherein an energy detector analyzes the filtered time signal.

Description

Technical Field

[0001] The present invention relates to a radar module for a radar system, a radar system, and a method for operating the radar module for the radar system. Background Technology

[0002] To provide safety and comfort features, radar systems are used in motor vehicles to measure the distance, relative speed, and angle between objects (i.e., vehicles) and obstacles. To achieve different fields of view around the vehicle—ultimately, omnidirectional vision—multiple radar sensors are currently installed in vehicles. These sensors can simultaneously have overlapping and non-overlapping fields of view. Since radar is an active sensor, i.e., it actively emits signals and analyzes and processes the reflections of those signals for environmental detection, it is essential, for the first mentioned scenario, that signals from different radar systems do not interfere with each other. For this purpose, the signals must be separable in at least one of the radar measurement dimensions.

[0003] Signals can be separated across a frequency range using frequency-division multiplexing (FDM), where different transmitting antennas occupy different frequency ranges at the same time. However, this reduces the available bandwidth of each transmitting channel. Since the range separation capability of a radar system is directly proportional to its bandwidth, the range separation capability is thus reduced.

[0004] Signals can also be separated in the time domain, where the antennas transmit sequentially using time-division multiplexing (TDM). However, the measurement time increases due to the sequential measurements. Furthermore, the object may have moved significantly during the increased measurement time, reducing measurement accuracy. Additionally, the increased time interval between two sequential measurements from the corresponding transmitting antennas can lead to a reduction in the maximum uniquely measurable velocity range.

[0005] While radar sensors at a single vehicle can theoretically avoid mutual interference through coordinated control, radar signals from other vehicles can cause interference to those sensors. A known approach involves identifying the interference components from other radar sensors within the radar signal and suppressing these components through appropriate signal processing. This approach can achieve a better signal-to-interference ratio. Improvements in radar technology, the effectiveness of which largely depends on the interfering signal, have been made. Recently, alternative schemes have also been known to suppress existing interference, employing cognitive behavior to selectively and adaptively avoid interference. This radar concept—Interference Aware Cognitive Radar (IACR)—continuously detects the entire spectrum available for radar operation, probing existing signals (potential interferences), estimating the parameters of those signals, and selecting a strategy to match the radar signal based on this, thereby avoiding interference in the next cycle. A key advantage here is that interference can be effectively avoided independently of its form, without requiring cooperation between the two radar systems.

[0006] The above implementation scheme is independent of the radar modulation method used. Typical transmission frequencies are 24 GHz or 77 GHz, where the maximum available bandwidth can reach up to 5 GHz, but is usually much lower. Typical bandwidth is approximately 0.5 GHz.

[0007] Modern vehicle radar systems typically use FMCW modulation (Frequency Radarmodulated Continuous Wave). This involves traversing multiple linear frequency ramps with the same or different slopes. The mixing of the current transmitted and received signals yields a low-frequency signal whose frequency is proportional to the distance. Additionally, additive or subtractive components are also included due to the Doppler frequency, which is proportional to the relative velocity. To separate the range and velocity information for multiple targets, the matching method processes results with different ramps together with results from previous measurement cycles.

[0008] Newer systems rely on FMCW modulation with a faster ramp, i.e., fast linear frequency modulation, which makes the Doppler shift within the ramp negligible. The obtained range information is largely unique and explicit, and the Doppler shift can then be determined by observing the temporal evolution of the phase of the complex range signal. Range determination and velocity determination are performed independently, typically using a two-dimensional Fourier transform.

[0009] An exemplary radar sensor for a motor vehicle is known from DE 10 2016 221947A1.

[0010] Digital radar modulation methods such as OFDM (orthogonal frequency division multiplex) are known, in which OFDM symbols are transmitted sequentially, thereby allowing range analysis and velocity analysis to be performed independently of each other—similar to that in fast linear frequency modulation systems.

[0011] For this purpose, a two-dimensional Fourier transform can be used, where the transmitted radar modulation symbols must be pre-eliminated (digital demodulation). The principle of IACR can be applied to all radar modulation types implemented above. The main challenge here is the continuous detection of the entire spectrum available for radar operation, as this spectrum typically has a relatively large bandwidth (5 GHz in the 77 GHz band, i.e., 76-81 GHz). Regular spectrum detection at the Nyquist sampling rate would require an analog-to-digital converter (ADC) with a very large bandwidth (10 GHz in real sampling and 5 GHz in IQ sampling). Such ADCs are generally not commercially available, or have a decisive impact on the system cost.

[0012] An FMCW radar with interferometric detection is known from WO 2017 / 081180 A1. Measurements are performed during a pause in the radar equipment's original (eigentlich) measurements. Compensation is performed based on the detected interferometry. Summary of the Invention

[0013] The present invention provides a radar module for a radar system, a radar system, and a method for operating the radar module for the radar system.

[0014] Preferred embodiments are the subject of extensions of the present invention.

[0015] According to a first aspect, the present invention provides a radar module for a radar system operating in a pre-given frequency band. The radar module includes a receiver device and an analysis and processing device. The receiver device receives radar interference signals in the pre-given frequency band during a reception time period. The analysis and processing device analyzes and processes the spectrum of the received radar interference signals, wherein the analysis and processing device is configured to convert the radar interference signals detected during the reception time period into time signals, wherein the temporal variation of the time signals corresponds to frequency variations or frequency range variations of the received radar interference signals. The analysis and processing device further includes a matched filter or multiple matched filters with different characteristics, wherein the one or more matched filters are configured to filter the time signals. Furthermore, the analysis and processing device includes an energy detector configured to analyze and process the filtered time signals.

[0016] According to a second aspect, the present invention relates to a radar system having a transmitting device configured to transmit radar radiation in a predetermined frequency band. Furthermore, the radar system includes a radar module according to the present invention.

[0017] According to a third aspect, the present invention provides a method for operating a radar module for a radar system, wherein the radar system operates in a pre-given frequency band. During a reception time period, radar jamming signals are received in the pre-given frequency band. The spectrum of the received radar jamming signals is analyzed and processed, wherein the radar jamming signals detected during the reception time period are converted into time signals, wherein the temporal variation of the time signal corresponds to a frequency variation or frequency range variation of the received radar jamming signals. The time signal is filtered using at least one matched filter, wherein the filtered time signal is analyzed and processed using an energy detector.

[0018] Advantages of the present invention

[0019] This invention provides a radar module for a radar system that detects, analyzes, and processes the frequency bands permitted for radar operation in a particularly efficient manner, and provides information about the spectrum occupancy of the radar system. The radar module therefore preferably detects the entire available spectrum and provides information about spectrum occupancy in a particularly efficient and cost-effective manner by deterministically and directly (e.g., linearly) mapping the spectrum to a time signal.

[0020] The mapping from the spectrum to the time signal is preferably performed using a known function, and thus allows conclusions to be drawn from the time signal regarding the frequency occupancy of the observed band. Furthermore, signals existing in the spectrum that have traversed the mapping can be analyzed to obtain additional information about the existing signal.

[0021] In the context of this invention, "radar jamming signal" can be understood in particular as a radar signal not emitted by the radar system itself. When used in motor vehicles, for example, radar systems of other vehicles may emit radar signals that represent radar jamming signals.

[0022] If the DC component induced within the radar module itself is significant, the use of at least one matched filter is particularly advantageous. Therefore, alternative signal processing is provided, and coherent signal detection based on matched filters is employed. This alternative signal processing is especially advantageous for systems with a wide passband in the baseband. The processing involves searching for the expected signal in the baseband using knowledge of the scanning parameters of the linear oscillator providing the mixing signal and the passband, and detecting the position of these signals in the time signal. The resulting signal is then analyzed using an energy detector. This energy detector provides the detected spectral components as the spectrum of the radar jamming signal for analysis. The position of these detections (peaks) in the time domain corresponds to their frequency, as the linear scan of the local oscillator achieves a linear mapping of the frequency signal to the time axis. This process can be viewed as deconvolution, as it compresses the time signal obtained through scanning and filtering by the local oscillator into a single peak, i.e., a spectral peak.

[0023] Deconvolution, as described in the matched filter description, can be performed under the assumption that the frequency components are constant, but the same operation can be performed for other signal shapes (e.g., frequency ramps). Therefore, not only can the spectral occupancy be estimated from the time signal, but other parameters of the existing signal can also be obtained. The analysis processing device can, in particular, determine the slope of the frequency ramp.

[0024] Furthermore, interference avoidance can be achieved using matched filters. This involves identifying interference through analysis and matching it to the radar system's transmission behavior to prevent interference. This not only allows for the correction of measured, interfering radar signals but also enables active interference avoidance.

[0025] According to one extension of this radar module, monitoring or analysis can be performed across the entire frequency range of the radar system's operation. In particular, it can detect frequency ranges outside the currently measured bandwidth.

[0026] According to one extension of the radar module, multiple matched filters with different parameters are provided. These matched filters can, for example, model FMCW interference sources with different slopes. By determining the matched filter best suited to (e.g., based on the highest peak value) the signal, additional parameters of the interference signal, such as the slope of the FMCW interference ramp, can be measured instantaneously (i.e., by scanning).

[0027] According to one extension of this radar module, the detection of the interference signal and the estimation of additional interferometric parameters are performed sequentially. The additional interferometric parameters may include, for example, the slope of the interference ramp. The detection of the interference signal is based on a matched filter designed for a given, as general as possible, interference signal. For example, the matched filter may be designed for a constant frequency. Additional interferometric parameters can then be estimated for the detected interference. This can be done using a correlation method that assumes the detected location of the interference signal is known and searches for the maximum correlation for different slopes. The slope providing the maximum correlation value can be inferred from the slope of the interference ramp. This allows multiple matched filters to be replaced with a more computationally efficient alternative.

[0028] According to one extension of the radar module, the analysis and processing apparatus includes at least one anti-aliasing filter. Preferably, the bandwidth of the anti-aliasing filter is selected such that sufficient signal components for robust interference detection and parameter estimation are allowed to pass through, but where efficient and as low a sampling rate as possible is still achieved when sampling is performed using an analog-to-digital converter. This allows for high frequency resolution through pulse compression. Here, the energy of the signal allowed to pass through the anti-aliasing filter is compressed into spikes. This approach allows for high sensitivity because more signal components and therefore more signal energy are allowed to pass through the anti-aliasing filter. This enables the detection of interference with low power.

[0029] By using anti-aliasing filters and matched filters, it is possible to concentrate interference allowed to pass through the anti-aliasing filter, and to achieve a sharp reduction in sampling rate and data rate due to the anti-aliasing filter. This has the following advantages: instantaneous estimation of the slope of the interference ramp can be performed. Furthermore, more energy passes through the anti-aliasing filter compared to the case with a narrow anti-aliasing filter. Finally, the contribution of the DC component is less critical.

[0030] In the practical design of radar systems, the DC component introduced into the system is usually unavoidable. This DC component is generated, for example, by mixers that allow the LO signal to pass, by Tx switches that cannot perfectly attenuate the transmitted signal, or the like. If the anti-aliasing filter only allows a small number of frequency components of the interfering signal close to the DC value to pass, the DC component primarily defines the detection threshold and can severely impair the system's sensitivity. With the solution according to the invention, the DC component can even be filtered out, and the remaining frequency components of the interfering signal still allow for robust interferometric detection.

[0031] According to one extension of this radar module, the scanning coverage extends to the entire frequency range potentially usable for radar operation. The anti-aliasing filter has a sufficiently wide cutoff frequency (Grenzfrequenz) to achieve high sensitivity and robust estimation of interferometric parameters, yet is narrow enough to sufficiently reduce the sampling rate and the amount of data to be processed.

[0032] According to one extended embodiment of the radar module, the scanning bandwidth is several GHz, preferably at least 4 GHz. The scanning duration is several microseconds, preferably tens of microseconds, approximately 50 microseconds. The bandwidth of the anti-aliasing filter is preferably several MHz, or particularly preferably tens of MHz, for example 20 MHz.

[0033] According to one extension of the radar module, scanning is performed at different slopes. A particularly advantageous approach is the alternating sawtooth-shaped scan, which eliminates the need for slicing during frequency changes in the LO signal.

[0034] According to one extension of this radar module, a dedicated radar module is involved, that is, a radar module whose hardware differs from that of the original radar system. This allows for spectrum measurement not only during transmission pauses in the radar system but also for continuous spectrum measurement.

[0035] However, according to another configuration, the radar module can also share hardware components with the original radar system, particularly a common transmit antenna and / or receiver antenna. In this case, the radar module can be configured to perform measurements during transmission pauses.

[0036] According to one extension of this radar module, the analysis includes deconvolution, which enables a clearer mapping of the spectral occupancy. Based on the obtained information—the spectral occupancy and (possibly) signal parameters—the radar system can adaptively match its signal to optimize radar performance, particularly in terms of interference avoidance.

[0037] According to one extension of the radar module, the frequency or frequency range of the received radar jamming signal corresponds to each moment of a time signal. Therefore, the time signal corresponds to at least one predetermined portion of a predetermined frequency band and completely maps the predetermined frequency band.

[0038] According to one extension of the radar module, the analysis and processing device includes a local oscillator that outputs a mixed signal, wherein the frequency of the mixed signal varies with time according to a pre-given function, and generating a time signal by the analysis and processing device includes mixing the received radar interference signal with the mixed signal.

[0039] According to one extension of the radar module, the temporal variation of the frequency of the mixing signal is linearly ramp-shaped.

[0040] According to an extension of the radar module, the analysis and processing unit further includes a low-pass filter. The generation of the time signal by the analysis and processing unit also includes filtering the radar interference signal mixed with the mixing signal using the low-pass filter. Therefore, a deterministic mapping of the entire spectrum to the time signal can be advantageously performed by mixing the signal present in the spectrum with a preferably linear ramp, and filtering the resulting signal using a low-pass filter. With a low-pass filter having a sufficiently narrow passband, after filtering, the following signal component is retained in the time signal: at the time of mixing, this signal component has a frequency approximately the same as the ramp at the receiver. With a slightly wider low-pass filter, other signal components are retained, which allow for further conclusions about the signal shape, but require additional processing steps.

[0041] According to an extension of the radar module, the analysis and processing unit is further configured to receive information about the radar system's current transmission frequency band. This unit is also configured to analyze and process the spectrum of received radar interference signals outside the radar system's current transmission frequency band. The radar module can be implemented as a dedicated channel that detects and analyzes the complete spectrum outside the current frequency band. Based on this, flow control of the radar system is performed for interference avoidance.

[0042] According to an extension of the radar module, the analysis and processing unit is further configured to: assign radar parameters to the received radar interference signal by analyzing and processing the spectrum of the received radar interference signal. Therefore, the radar module enables the estimation of signal parameters across multiple measurement cycles or scans of the local oscillator. For example, it can detect the frequency ramp of an FMCW radar, which results in the following detection across different local oscillator scans at different frequency positions: this detection has a linear and periodic variation across the scans of the local oscillator. The analysis and processing unit can completely detect potential interference sources from such signals. The radar parameters can include, in particular, at least one of bandwidth, repetition rate, and slope. The analysis and processing device can acquire additional information about the scene and about potential interference sources. The radar parameters can further include, in particular, at least one of the interference source's range, angle, transmission power, or the like. Based on this information, it may also be possible to identify the equipment type of the interference source (e.g., the equipment's manufacturer and model). This can be done, for example, by having the analysis and processing device compare the detected parameters with known radar types stored in a database.

[0043] This knowledge can be used to predict further spectral changes in potential interference sources, allowing interference to be avoided through signal adaptation.

[0044] This invention can be used in the automotive radar frequency band from 76 to 81 GHz, but can also be used in other frequency bands that are permitted for radar operation if the design is suitable.

[0045] According to one extended embodiment, the radar module includes a control unit configured to output control signals to the radar system to match the radar system's operating mode based on the analyzed spectrum of the received radar jamming signal. Based on the analysis of the received radar jamming signal's spectrum, the radar system can therefore adaptively match the radar signal in terms of time, frequency, and the waveform used to avoid interference with other radar sensors. This is independent of radar modulation and applies to all radar systems capable of operating according to the IACR scheme. The control signals can be matched according to radar parameters already assigned to the received radar jamming signal. Attached Figure Description

[0046] The attached diagram shows:

[0047] Figure 1 A schematic block diagram of a radar system with a radar module according to an embodiment of the present invention is shown.

[0048] Figure 2 A schematic block diagram showing the receiving path of a radar module in a radar system according to an embodiment of the present invention;

[0049] Figure 3 A schematic diagram showing the time-varying process of the frequency ramp;

[0050] Figure 4 The time-varying process of the frequency ramp of different matched filters is shown;

[0051] Figure 5 The peak values ​​of different matched filters are shown; and

[0052] Figure 6 A flowchart illustrating a method for operating a radar module according to an embodiment of the present invention is shown.

[0053] In all the accompanying drawings, the same or functionally identical elements and devices are given the same reference numerals. Detailed Implementation

[0054] Figure 1A schematic block diagram of a radar system 4 having radar module 1a is shown. Although radar module 1a is described below as a hardware module, it can also be implemented in software according to other embodiments. For example, the software module can be implemented during a transmission pause in the radar system. Therefore, the invention is not limited to hardware modules, but extends to software modules or hybrid hardware / software modules.

[0055] Radar system 4 has a transmitting device 5 that transmits radar radiation in a predetermined frequency band. Radar module 1a also has a receiver device 2 that receives radar signals, particularly radar jamming signals, in the predetermined frequency band during a receiving period.

[0056] Furthermore, radar module 1a includes an analysis and processing unit 3a that analyzes and processes the spectrum of the received radar jamming signal. The analysis and processing unit 3a converts the radar jamming signal detected during the reception period into a time signal. The temporal variation of this time signal corresponds to the frequency variation or frequency range variation of the received radar jamming signal.

[0057] The analysis and processing unit 3a can be coupled to the transmitting unit 5 to include information such as the current transmission frequency band or frequency at which the transmitting unit 5 emits radar radiation. The analysis and processing unit 3a analyzes and processes the spectrum of the received radar jamming signal outside the current transmission frequency band or frequency of the transmitting unit 5.

[0058] The analysis and processing apparatus 3a includes at least one matched filter that filters the time signal. The analysis and processing apparatus 3a also includes an energy detector for analyzing and processing the filtered time signal.

[0059] Figure 2 A schematic block diagram of another radar module 1b of the radar system is shown. This radar module has a receiver device, or receiver antenna 2, designed to receive the entire effective frequency spectrum of the radar system. A ramp generator 32 generates a signal that serves as the input to a local oscillator (LO) 33. The output signal of the local oscillator 33 (i.e., the mixing signal) is mixed with the received high-frequency signal in a mixer 31, thereby obtaining a low-frequency signal in the baseband. The frequency of the local oscillator signal varies linearly with time, thus representing a frequency ramp or frequency sweep, typically spanning the entire effective frequency range.

[0060] The mixing with the received signal then results in a baseband signal, which is generated over time by a continuously varying high-frequency band. Optionally, the mixed signal in the baseband is filtered using a low-pass filter 34, which allows a relatively narrow bandwidth to pass through. The filtered signal is then sampled by an analog-to-digital converter 35 and provided to a digital signal processor 36 for digital processing. Furthermore, other functional blocks (e.g., amplifiers, filters, and dedicated signal processing blocks) may also be included in the receiving path. Components 31 to 36 constitute the analysis and processing apparatus 3b.

[0061] According to one of the above embodiments, radar modules 1a and 1b can be implemented as independent integrated circuits (ICs). Radar modules 1a and 1b can also be integrated into the integrated circuit of a radar system. When integrated into the integrated circuit of a radar system, not only can their own receiving antenna be used, but signals from existing receiving paths can also be coupled and amplified if necessary.

[0062] Radar modules 1a and 1b are capable of receiving any frequency regardless of the transmitted signal because a local oscillator signal, or mixer signal, can be used for this purpose, which differs from the local oscillator signal of the original radar system 4. Depending on accuracy requirements, the local oscillator signal used for this purpose can be generated by adjusting or controlling the oscillator. Alternatively, the local oscillator signal used in this invention can be derived from the local oscillator signal used for the original radar measurements using mixers, oscillators, digital-to-analog converters, digital synthesizers (DDS), phase-locked loops (PLLs), or other components. The local oscillator signal generation for this receiving channel can be designed independently of the requirements of the original radar channel, and therefore can be specifically optimized for the intended use. The intermediate frequency bandwidth is determined by the desired system design, in which, in principle, a narrow bandwidth receiver is possible.

[0063] Radar modules 1a and 1b can be integrated into the flow control of radar system 4, thereby enabling interferometric measurements to be synchronized with their own radar measurements in time. Therefore, to improve system efficiency, measurements can be performed only outside the transmission frequency band. Different operating modes are possible. On the one hand, the receiving path can be continuous. The entire permitted frequency band can be monitored. Alternatively, only a portion of the band can be monitored (e.g., above or below the currently used band), or only one or more spare bands can be monitored. Since the local oscillator frequency of the receive path differs from the local oscillator frequency of the channel used for radar measurements, it is also possible to monitor this band during the measurement process, which improves the response speed to interference signals.

[0064] Alternatively, existing receiver paths can be used outside of radar measurement time via radar modules 1a and 1b. This eliminates the need for an additional dedicated receiver channel with its own LO generation. Measurements performed via the radar modules are conducted during the pauses in conventional radar measurements.

[0065] The digital signal processor 36 includes matched filters, and preferably includes multiple matched filters. The digital signal processing performed by the digital signal processor 36 involves detecting the allowed signal components using an energy detector. The positions of these signal components in the time signal correspond to the frequencies of the signals present in the spectrum. Therefore, the time signal allows for the determination of spectrum occupancy without requiring further signal processing steps (e.g., Fourier transform). Thus, radar modules 1a and 1b can be implemented very cost-effectively and efficiently, while simultaneously enabling the analysis of spectrum occupancy across the entire spectrum available for radar operation.

[0066] Figure 3 This diagram illustrates the time-varying process of the frequency ramp. Here, A corresponds to the time-varying process of the local oscillator signal, and B corresponds to the time-varying process of the received signal. The filter removes all frequencies except for the cutoff frequencies A1 and A2. The region within the time interval T is retained.

[0067] Figure 4 The time-varying process and peak value of the frequency ramps for different matched filters are shown. Each matched filter has a corresponding time-varying process B1 to Bn, where n is the number of matched filters.

[0068] exist Figure 5 The diagram shows peak values ​​P1 to Pn, which are obtained using corresponding matched filters. The matched filter with the highest peak value can be selected. Since the matched filter corresponds to an interference signal with defined characteristics (e.g., an FMCW ramp with a defined slope), these characteristics can be determined based on the selection of the matched filter.

[0069] Figure 6 A flowchart illustrating a method for operating radar modules 1a and 1b according to an embodiment of the present invention is shown. The radar system includes a transmitting device 5 that operates in a pre-given frequency band, i.e., emitting radar radiation.

[0070] In the first step S1, radar jamming signals are received in a pre-given frequency band during the reception time period.

[0071] In the second step S2, the spectrum of the received radar jamming signal is analyzed and processed, wherein the radar jamming signal detected during the reception time period is converted into a time signal. The temporal variation of this time signal corresponds to the frequency variation or frequency range variation of the received radar jamming signal. At least one matched filter is used to filter the time signal. The filtered time signal is then analyzed and processed using an energy detector.

Claims

1. A radar module (la; lb) for a radar system (4), wherein The radar system (4) operates in a predefined frequency band, the radar module having: a receiver device (2) configured to receive radar jamming signals in the predefined frequency band during a reception period; and an analysis processing device (3a; 3b) configured to analyze a frequency spectrum of the received radar jamming signals, wherein the analysis processing device (3a; 3b) is configured to convert the detected radar jamming signals during the reception period into a time signal, wherein a time course of the time signal over time corresponds to a frequency change or a frequency range change of the received radar jamming signals, wherein the analysis processing device (3a; 3b) has a plurality of matched filters configured to filter the time signal, wherein the analysis processing device (3a; 3b) has an energy detector configured to analyze the filtered time signal, wherein the plurality of matched filters each have different parameters and each correspond to a radar jamming signal with a FMCW ramp having a determined slope, so that the plurality of matched filters can model FMCW jamming sources with different slopes, wherein the slope of the FMCW ramp of the radar jamming signal can be determined based on a selection of the matched filters, wherein the analysis processing device (3a; 3b) is further configured to assign radar parameters to the received radar jamming signals by analyzing the frequency spectrum of the received radar jamming signals, wherein the radar module further has a control device configured to output a control signal to the radar system (4) in order to adapt the operating mode of the radar system (4) in accordance with the analyzed frequency spectrum of the received radar jamming signals in order to avoid interference with other radar sensors as FMCW jamming sources, wherein the control signal is adapted in accordance with the radar parameters assigned to the received radar jamming signals.

2. The radar module (la; lb) according to claim 1, wherein The analysis processing device (3a; 3b) comprises a local oscillator (33) which outputs a mixing signal, wherein a frequency of the mixing signal varies over time in accordance with a predefined function, wherein the generation of the time signal by the analysis processing device (3a; 3b) comprises mixing the received radar jamming signal with the mixing signal.

3. The radar module (la; lb) according to claim 2, wherein The time course of the frequency of the mixing signal is linearly ramp-shaped.

4. The radar module (la; lb) according to any one of claims 2 or 3, wherein, The analysis processing device (3a; 3b) further has a low-pass filter (34), wherein the generation of the time signal by the analysis processing device (3a; 3b) further comprises filtering the radar jamming signal mixed with the mixing signal by means of the low-pass filter (34).

5. The radar module (la; lb) according to any one of claims 1 to 3, wherein, The analysis processing device (3a; 3b) is further configured to receive information about a current transmission frequency band of the radar system (4), wherein the analysis processing device (3a; 3b) is configured to analyze the frequency spectrum of the received radar jamming signals outside the current transmission frequency band of the radar system (4).

6. The radar module (la; lb) according to claim 2, wherein The linear sweep of the local oscillator (33) effects a linear mapping of the frequency spectrum of the received radar jamming signal onto a time axis.

7. A radar system (4), the radar system having a transmitting device (5) which is configured for emitting radar radiation in a predefined frequency band; and a radar module (la; lb) according to any one of claims 1 to 6.

8. A method for operating a radar module (la; lb) for a radar system (4) according to any one of claims 1 to 6, wherein, The radar system (4) operates in a predefined frequency band, the method having the following steps: receiving (SI), by the radar module (la; lb), radar jamming signals in the predefined frequency band during a reception time period; and analyzing (S2), by the radar module (la; lb), the frequency spectrum of the received radar jamming signals, wherein the detected radar jamming signals during the reception time period are converted into a time signal, wherein a time course over time of the time signal corresponds to a frequency change or a frequency range change of the received radar jamming signals, wherein the time signal is filtered by means of a plurality of matched filters, wherein the filtered time signal is analyzed by means of an energy detector.

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