Gesture detection system with improved sensitivity for motor vehicle

Abstract

A gesture (1) detection device (1) intended to be mounted on a motor vehicle, comprising:-a radar module (2) having at least one radio frequency antenna (21) for transmitting a radio frequency signal and for receiving a return radio frequency signal from a reflection of the transmitted radio frequency signal on a target (50); and-a signal processing module (3) for receiving data relating to the return signal and deriving therefrom information relating to the detection of the gesture. The radio frequency antenna (21) is configured, in use, to transmit a linearly polarized signal along a substantially vertically oriented polarization axis (201). The system (1) comprises at least one housing (4) housing the radar module (2), where a distance (d1) between the antenna (21) and an outer surface (41) of the housing (4) forming part of the outer surface of the vehicle in use is greater than or equal to: dlim = 2 * D2 / lambda + d0, where D is the diameter of the antenna (21), lambda is the center wavelength of the transmitted signal, and d0 is a normal number or zero.

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of motor vehicles, and more particularly to a gesture detection system intended to be installed on a motor vehicle for detecting a predetermined gesture performed by a user located outside the vehicle.

[0002] Upon detection of the predetermined gesture, the gesture detection system generates a command allowing, for example, directly or indirectly, to drive the opening and / or the unlocking of a door leaf such as a side door or a trunk door of the vehicle. BACKGROUND

[0003] Such gesture detection systems based on radiofrequency detection are known in the prior art. In particular, a radar module is configured to emit a radiofrequency signal called emission signal and to receive a radiofrequency signal called return signal coming from the reflection of the emission signal on a target.

[0004] The analysis of the return signal allows to obtain information related to the movement performed by the target and thus to identify the predetermined gesture, notably by comparison with a threshold value.

[0005] Indeed, the return signal is advantageously mixed with a signal having the frequency of the emission signal to obtain data related to the in-phase component I(t) and the quadrature-phase component Q(t) of the return signal. The analysis of these components notably allows to extract a phase value describing the movement performed by the target.

[0006] In use, the target is formed by a part of the body of the user, generally a hand or a foot. For example, it is known to implement the detection of a foot movement performed under the rear bumper of the vehicle by the user to drive the opening of the trunk or of the tailgate. Another application consists in detecting a hand movement performed in the vicinity of a lateral intermediate pillar of the vehicle, for example the B-pillar, or in English the "B-pillar", to drive the opening of a side door, for example a sliding door.

[0007] However, the detection of the predetermined gesture can be affected by disturbing movements in the external environment, in particular disturbing movements generated by raindrops.

[0008] Indeed, when it is raining, raindrops falling around the vehicle form a moving target for the gesture detection system. These water drops then generate a significant amount of detection noise. Moreover, since the falling speed of the water drops is of the same order of magnitude as the displacement speed of the target in the predetermined gesture, this noise is in the same frequency band as the useful signal associated with the gesture performed by the user.

[0009] There exist solutions for eliminating this noise. They are based on complex digital signal processing which shows limits for heavy rain and extreme weather conditions.

[0010] The object of the present invention is to propose a gesture detection system intended to be installed on a motor vehicle for detecting a predetermined gesture performed by a user located outside the vehicle and which is robust to the noise generated by the rain even in case of heavy rain.

[0011] Another object of the present invention is to propose a solution which does not involve extremely complex signal processing. SUMMARY

[0012] This object is achieved with a gesture detection system intended to be installed on a motor vehicle for detecting a predetermined gesture performed by a user located outside the vehicle, said system comprising:

[0013] - a radar module comprising a printed circuit board equipped with at least one radiofrequency antenna configured to emit a radiofrequency signal called the emission signal and to receive a radiofrequency signal called the return signal coming from the reflection on a target of the emission signal; and

[0014] - a signal processing module in communication connection with the radar module, configured to receive data relating to the return signal and to derive therefrom information relating to the detection of the predetermined gesture;

[0015] According to the invention:

[0016] - said at least one radiofrequency antenna is configured to emit a linearly polarized emission signal along a predetermined polarization axis intended to be substantially vertically oriented in use; and - the system comprises at least one housing containing the radar module, wherein the distance di between said at least one radiofrequency antenna and the outer surface of the housing is greater than or equal to a distance:

[0017] d lim = 2*D2 / λ + do, with

[0018] D being the diameter of said radiofrequency antenna,

[0019] λ being the central wavelength of the emission signal, and

[0020] do being a positive constant or zero, i.e. a value greater than or equal to zero,

[0021] wherein said outer surface of the housing is intended to form in use a part of the outer surface of the vehicle.

[0022] The invention is thus based on the advantageous combination of two features.

[0023] In one aspect, to detect the posture, a linearly polarized emitted radar signal is used. The posture detection system is configured in such a way that, in use in a motor vehicle and when the vehicle has its four wheels in contact with the horizontal ground, the polarization axis is oriented substantially vertically. By "substantially vertically" is meant "parallel to the gravity axis to within an angle of 10° or so, even to within an angle of 5° or so, even to within an angle of 1° or so" (where an angle of 180° is equivalent to π radians). The predetermined polarization axis is thus, in use, substantially parallel to the displacement axis of the raindrops.

[0024] On the other hand, it is ensured that the distance d1 between the at least one radio frequency antenna and the outer surface of the shell forming, in use, part of the outer surface of the vehicle is greater than or equal to d lim = 2 * D 2 / λ + d0. When there are a plurality of radio frequency antennas for emitting the emitted signal and / or for receiving the return signal, each of them attests to this condition. d1 is the minimum distance between the antenna in question and the outer surface of the shell forming, in use, part of the outer surface of the vehicle.

[0025] D corresponds to the diameter of the radio frequency antenna defined in the plane of the printed circuit board and corresponding to the maximum straight dimension of the antenna in this plane. Preferably, D is the diameter of the smallest square or rectangle in which the radio frequency antenna in question is inscribed. The ground plane is not considered to form part of the antenna.

[0026] λ corresponds to the central wavelength of the emitted signal, with λ = C / f, where C is the speed of light in a vacuum and f is the central frequency of the emitted signal.

[0027] 2 * D2 / λ defines the limit distance between the Fresnel zone and the near field and the far field of the antenna in question.

[0028] The constant d0 defines a safety margin for ensuring operation in the far field, in particular taking into account the mechanical tolerances of the system according to the invention.

[0029] The constant d0 can take a zero value, but it is advantageously between 2 mm and 7 mm, for example equal to 5 mm.

[0030] By making this distance d1 greater than or equal to d lim , it is ensured that the external environment liable to generate noise and more particularly the possible raindrops are in the far field of the at least one radio frequency antenna.

[0031] By detecting and emitting only the vertically polarized signals in the far field, it is ensured that the return signals reaching the radar module are not or little affected by the movement of the raindrops.

[0032] In particular, the arrangement according to the application avoids any near-field detection associated with raindrops. In the far field, raindrops can be detected with circularly polarized transmitted signals. By virtue of a vertical linear polarization of the transmitted signals substantially parallel to the displacement axis of the raindrops, the detection of water drops in the far field is also minimized.

[0033] The application thus proposes a clever solution for minimizing the effect of rain on the return signal in a gesture detection system intended to be installed on a motor vehicle for detecting a predetermined gesture performed by a user located outside the vehicle. Instead of optimizing the processing of the received signal as the skilled person would be prompted to do, the application proposes, on the contrary, to optimize the physical features of the detection system. This solution allows to eliminate complex processing which is costly in terms of computing resources and energy. Moreover, this solution has the best robustness even for heavy rain and extreme weather conditions.

[0034] By reducing the effect of rain on the return signal, the signal-to-noise ratio between the useful signal associated with the gesture performed by the user and the noise related to the rain in particular is increased. This allows in particular to reduce the false detection rate of the predetermined gesture (false detection of the predetermined gesture, or inversely, lack of detection of the predetermined gesture despite the proper action of the user).

[0035] Indeed, the distance between the at least one radiofrequency antenna and said outer surface of the housing is advantageously greater than or equal to 5 mm, even greater than or equal to 8 mm, even greater than or equal to 10 mm.

[0036] In an advantageous embodiment, a single antenna is configured to transmit the transmitted signal and to receive the return signal.

[0037] As a variant, one antenna is configured to transmit the transmitted signal and another, different antenna is configured to receive the return signal. These two antennas are advantageously integrated on the same printed circuit board. According to the application, both of them demonstrate the condition according to which the distance from the outer surface of the housing is greater than or equal to 2*D i 2 / λ, with D i being the diameter of the antenna considered and λ being the central wavelength of the signal transmitted by the transmitting antenna.

[0038] In an advantageous embodiment, the radar module comprises at least two radiofrequency antennas, one of which is linearly polarized for transmitting the transmitted signal and one of which is circularly polarized for receiving the return signal.

[0039] The transmitted signal is advantageously a radiofrequency signal with a central frequency between 5 GHz and 10 GHz.

[0040] As a complement or as a variant, the emission signal is advantageously a radio frequency signal having a spectral width greater than 500 MHz.

[0041] The housing advantageously comprises a fitting or structural part for the vehicle, equipped with a recess for accommodating the radar module, and a trim panel covering the recess and forming said outer surface of the housing.

[0042] The radar module can be fixed at the bottom of the housing on the side opposite said outer surface of the housing.

[0043] As a complement or as a variant, the radar module is equipped with at least one gasket on the side of said outer surface of the housing.

[0044] The invention also relates to a motor vehicle equipped with a system according to the invention.

[0045] Said system is advantageously located at a structural pillar of the vehicle, with the polarization axis of the linearly polarized radio frequency antenna substantially parallel to the elongation axis of said pillar at an angle of the order of 10°. BRIEF DESCRIPTION OF DRAWINGS

[0046] Other features and advantages of the invention will become apparent on reading the following description. The description is purely illustrative and should be read with reference to the appended drawings in which:

[0047] [ Figure 1 ] Figure 1 a gesture detection system according to the invention when used in a rainy environment is illustrated in a schematic manner;

[0048] [ Figure 2 ] Figure 2 a printed circuit board of the radar module in the system of Figure 1 is illustrated in a schematic manner in a top view;

[0049] [ Figure 3 ] Figure 3 a gesture detection system according to a first variant of the invention is illustrated in a schematic manner; and

[0050] [ Figure 4 ] Figure 4 a gesture detection system according to a second variant of the invention is illustrated in a schematic manner. DETAILED DESCRIPTION

[0051] A first embodiment of a gesture detection system 1 according to the invention, represented in Figure 1 , when used in a rainy environment, is first described.

[0052] The gesture detection system 1 is intended to be installed on a motor vehicle (not represented) for detecting a predetermined gesture performed by a user located outside the vehicle.

[0053] In an advantageous manner, the detection of the predefined gesture generates directly or indirectly a command for opening and / or unlocking a door leaf, such as a side door or a trunk door of a vehicle.

[0054] For example, in use, the gesture detection system 1 is integrated at a rear bumper of a vehicle to detect a predefined gesture implemented by a foot of a user for driving the opening of a trunk door or tailgate.

[0055] As a variant, the gesture detection system 1 is integrated at a lateral intermediate pillar of a vehicle, preferably at a “B-pillar” to detect a predefined gesture implemented by a hand of a user for driving the opening of a side door. The invention is obviously not limited to these two examples.

[0056] The system 1 comprises a radar module 2, a signal processing module 3 and a housing 4 which at least houses the radar module 2.

[0057] The radar module 2 is illustrated in more detail and according to a top view in Figure 2 The radar module 2 is illustrated in more detail and according to a top view in

[0058] The radar module 2 comprises in particular a printed circuit board 20, Figure 2 is a view in the plane of said printed circuit board.

[0059] The printed circuit board 20 is equipped with at least one radiofrequency antenna 21 represented in a schematic manner in Figure 1 and Figure 2 The printed circuit board 20 is equipped with at least one radiofrequency antenna 21 represented in a schematic manner in

[0060] Throughout the text, the term “radiofrequency” relates to signals whose carrier frequency is between 3 kHz and 300 GHz. Preferably, in the invention, the carrier frequency is between 5 GHz and 30 GHz. For example, the carrier frequency is between 5 GHz and 10 GHz, more preferentially between 7 GHz and 9 GHz, more preferentially between 6.5 GHz and 8 GHz, including the limits, for example equal to 8 GHz. As a variant, the carrier frequency is between 20 GHz and 30 GHz, for example equal to 24 GHz.

[0061] The at least one radiofrequency antenna 21 is configured to emit radiofrequency signals called emission signals and to receive radiofrequency signals called return signals from reflections of the emission signals on a target.

[0062] The emission signals are advantageously pulsed signals in which the pulses are carried by a carrier wave having a radiofrequency as defined above. The carrier frequency can vary as a function of time within each pulse.

[0063] Preferably, the emitted signal then has a ratio between its spectral width and its central frequency greater than or equal to 20% and / or a spectral width greater than 500 MHz. In other words, the emitted signal is an ultra-wide-band (or UWB, for "ultra-wide-band" in English) signal.

[0064] As a variant, the emitted signal is a frequency modulated continuous signal (or FMCW, for "frequency modulated continuous wave" in English). It involves a continuous signal whose frequency varies as a function of time to be able to scan a wide frequency range.

[0065] In any case, it is advantageous for the emitted signal to have a wide spectral band for implementing the gesture detection. However, the application is not limited to this feature and also concerns the case of a continuous emitted signal.

[0066] In use, the emitted signal is reflected on at least one target present in the environment of the radar module 2 and comes back to the radar module in the form of a return signal. The return signal has physical characteristics, in particular in terms of phase, beat frequency and amplitude, which allow to describe the movement of the target. This return signal is received by the at least one radio frequency antenna 21.

[0067] In the example illustrated in Figure 2 In the example illustrated in

[0068] Here and in an advantageous manner, the printed circuit board 21 also comprises a pre-processing unit 22 connected to the at least one antenna 21.

[0069] The pre-processing unit 22 is configured to:

[0070] - generate an adapted electrical signal and transmit this signal to the input of the at least one antenna 21 for the emission of the emitted signal;

[0071] - receive an electrical signal from the at least one antenna 21 and corresponding to the return signal;

[0072] - implement at least one mixing between the electrical signal corresponding to the return signal and an electrical signal having the frequency of the emitted signal, preferably a same phase signal and a quadrature phase signal, so that a signal I(t) is generated and respectively Q(t).

[0073] To this end, the pre-processing unit 22 advantageously comprises elements for generating electrical signals that can be converted into radio frequency signals, such as an electrical oscillator, at least one mixer, and at least one analog-to-digital converter for implementing time sampling and converting the analog signals into digital signals.

[0074] The radar module 2 is connected to a signal processing module 3. The signal processing module comprises at least one processor and at least one memory storing a data analysis computer program.

[0075] The signal processing module 3 is configured to receive as input data relating to the return signals, for example the signals I(t) and Q(t) mentioned above, reorganized into packets transmitted at regular intervals, for example in the form of a matrix called CIR. It is configured to implement an analysis of these data relating to the return signals so as to make it possible to identify when a target has performed a predetermined gesture with respect to the antenna 21.

[0076] The gesture recognition is based on feature extraction, such as the phase shift between the transmitted signal and the return signal, and / or the Doppler frequency, and / or the amplitude variation between the transmitted signal and the return signal, etc. The extracted data are analyzed, for example compared with predetermined thresholds that define the predetermined gestures. In an advantageous manner, the transmitted signal is a wideband signal as described previously, and the signal processing module 3 implements the extraction of the data relating to the expected distance interval between the target and the antenna 21 beforehand.

[0077] The signal processing module 3 is configured to provide information relating to said detection at an output when it detects a predetermined gesture. This information is sent to the input of a drive unit, such as a unit for driving the unlocking and / or opening of a door of a vehicle, in which an unlocking and / or opening command is then generated. In a variant, said drive unit forms an integral part of the signal processing module 3.

[0078] The gesture detection system 1 is intended to recognize the performance of a predetermined gesture by a target 50 located outside the vehicle and formed by a body part of a user, generally a hand or a foot. However, it is understood that any moving object in the field of view of the radio frequency antenna 21 can reflect at least part of the transmitted signal and thus generate an interference signal. This interference signal disturbs the detection of the signal reflected by the target 50. This disturbance is even more difficult to limit when it is generated by objects moving at a speed comparable to that of the target 50. This is especially true when these objects are formed by raindrops 60.

[0079] According to the invention, at least one radio frequency antenna 21 is configured to transmit a linearly polarized transmitted signal along a predetermined polarization axis. In other words:

[0080] - when the same radio frequency antenna 21 implements both the transmission of the transmitted signal and the reception of the return signal, the latter is linearly polarized; and

[0081] - when two distinct antennas implement the emission of the emission signal and the reception of the return signal, respectively, at least the emission antenna is linearly polarized. The antenna for receiving the return signal can have a non-linear polarization, for example circular polarization.

[0082] In Figure 1 the polarization axis of the linearly polarized emission signal is represented in a schematic manner by the arrow 201.

[0083] In use, when the system 1 according to the application is installed on a vehicle with its wheels resting on a horizontal ground plane, the polarization axis 201 is oriented substantially vertically, i.e. substantially parallel to the gravity axis.

[0084] By "substantially parallel" is understood an angular deviation of less than or equal to 10° in absolute value, even less than or equal to 5° in absolute value, less than or equal to 1° in absolute value (where an angle of 180° is equal to π radians).

[0085] In an advantageous but non-limiting example, the system 1 according to the application is configured to be mounted at the lateral intermediate pillar of the vehicle (for example the "B-pillar"), where the polarization axis 201 is substantially parallel to the prolongation axis of the pillar. Here again, by "substantially parallel" is understood an angular deviation of less than or equal to 10° in absolute value, even less than or equal to 5° in absolute value, less than or equal to 1° in absolute value (where an angle of 180° is equal to π radians). The lateral intermediate pillar generally extends along a vertical axis, this arrangement of the polarization axis 201 with respect to the prolongation axis of the pillar easily enabling the desired orientation with respect to the vertical axis.

[0086] The person skilled in the art will easily know, in the literature and in their general knowledge, examples of linearly polarized radiofrequency antennas that are preferably able to be directly integrated on a printed circuit board. For example, a monopole antenna integrated on a printed circuit will be able to be cited.

[0087] Also according to the application, the system 1 comprises a housing 4, inside which the radar module 2 is located. Here but in a non-limiting manner, the signal processing module 3 is arranged remotely outside the housing 4. In practice, the housing 4 is configured to leave exposed the electrical connection lines extending from the radar module 2 to the outside.

[0088] The radar module 2 is fixedly arranged in the housing 4 and ensures that the distance d1 between the at least one radiofrequency antenna 21 and the outer surface 41 of the housing is proven to be:

[0089] d1≥d lim where d lim = 2*D2 / λ + d0.

[0090] D is the diameter of the radiofrequency antenna 21 under consideration. The diameter D of the antenna 21 is its largest straight dimension in the transverse direction in the plane of the printed circuit board 20. In practice, it advantageously relates to the diameter of the smallest rectangle (or square) in which the antenna is inscribed, in a top view in the plane of the printed circuit board 20. This smallest rectangle 29 is represented in dashed lines in Figure 2 In this, the track of the antenna 21 in the plane of the printed circuit board 20 is delimited. Here, it comprises the rectangular emission zone as well as the adaptation zones between the rectangular emission zone and the tracks for circulation of the electrical signals. Conversely, the track of the antenna excludes the ground plane. D is for example between 1 cm and 3 cm, for example equal to 2 cm.

[0091] λ is the central wavelength of the emission signal (substantially equal to the wavelength of the return signal).

[0092] d0 is a non-zero or zero number, advantageously between 2 mm and 20 mm, even between 2 mm and 5 mm, for example equal to 5 mm.

[0093] Said outer surface 41 of the housing is an outer surface of the housing which, in use, is intended to form part of the outer surface of the vehicle.

[0094] The outer surface 41 of the housing is thus, in use, in a facing position with respect to the detection zone of the posture detection system 1.

[0095] The value 2*D2 / λ delimits a zone R1 of the detection zone corresponding to the far field of the radiofrequency antenna 21 (distances greater than or equal to 2*D2 / λ), a zone R2 of the detection zone corresponding to the near field and the Fresnel zone (distances less than 2*D2 / λ). 2 / λ.

[0096] Thus, by virtue of the housing 4 and the arrangement of the radar module 2 in the housing 4, it is ensured that only objects in the far field are detected.

[0097] However, in the far field, the detection is sensitive to the polarization. In other words, in the far field, the return signal is not or little affected by objects whose movement is parallel to the polarization axis of the emission signal. By orienting the polarization axis of the emission signal along an axis parallel to the displacement axis of the raindrops, it is thus ensured, with the configuration, a high robustness with respect to the noise generated by the rain.

[0098] The invention thus allows to minimize the interference signals generated by the displacement of the raindrops facing the radar module 2, by combining a linearly polarized signal emission and a detection only in the far field.

[0099] According to an advantageous embodiment, the emission signal has a central frequency f equal to 8 GHz (where λ = C / f, with C being the speed of light in vacuum). This corresponds to 2*D2 / λ = 0.5 m. This value is chosen so as to ensure a detection of the objects in the far field, while limiting the size of the radar module 2. 2 / λ « 5.3 mm. In an advantageous manner, d lim is chosen to be between 8 mm and 20 mm, for example d lim = 8 mm, or d lim = 10 mm.

[0100] Figure 3 A posture detection system 1'according to a first variant of the application is illustrated in a schematic manner. Only the differences with respect to the embodiment of Figure 1 will be described Figure 3 .

[0101] In this variant, the housing 4 is formed by a recess 43 in a structural or assembly part 44 of the motor vehicle and by the covering of at least part of said recess 43 by a trim panel 45.

[0102] The recess 43 is formed, for example, at the B pillar as defined previously, directly in the pillar or else in an assembly piece of said pillar.

[0103] The trim panel 45 is made, for example, of glass or plastic. The outer face of the trim panel 45, on the side opposite the recess 43 and the radar module 2, forms the outer surface 41 of the housing 4 as mentioned previously.

[0104] In the embodiment of Figure 3 , the radar module 2 is fixed against the bottom of the housing 4 on the side opposite the outer surface 41.

[0105] Figure 4 A posture detection system 1 " according to a second variant of the application is illustrated in a schematic manner. Only the differences with respect to the embodiment of Figure 3 will be described Figure 4 .

[0106] Here, the radar module 2 is equipped with a gasket 25 located between the printed circuit board 20 of the radar module 2 and the outer surface 41 of the housing 4 and allowing the desired distance to be ensured between these two elements.

[0107] In a variant not represented, the wall of the housing 4 located on the side of the detection zone of the radar module 2 has a large thickness, for example greater than or equal to 5 mm, which allows the desired distance to be ensured between the printed circuit board 20 of the radar module 2 and the outer surface 41 of the housing 4.

Claims

1. A posture detection system (1; 1'; 1”), intended to be mounted on a motor vehicle for detecting a predetermined gesture performed by a user located outside the vehicle, said system comprising: - a radar module (2) comprising a printed circuit board (20) equipped with at least one radio frequency antenna (21) configured to transmit a radio frequency signal, referred to as a transmit signal, and to receive a radio frequency signal, referred to as a return signal, from reflections of the transmit signal on a target (50); and a signal processing module (3) connected to the radar module (2) and configured to receive data relating to the return signal and to derive therefrom information relating to the detection of a predetermined gesture; Its characteristics are: - the at least one radio frequency antenna (21) is configured to transmit a linearly polarized transmit signal along a predetermined polarization axis (201), the predetermined polarization axis being intended to be oriented substantially vertically in use; and The system (1; 1'; 1") comprises at least one housing (4) housing the radar module (2), wherein the distance (d1) between the at least one radiofrequency antenna (21) and the outer surface (41) of the housing (4) is greater than or equal to the following distance: d lim =2*D 2 / λ+d0, where D is the diameter of the radio frequency antenna (21), λ is the central wavelength of the transmitted signal, and d0 is a positive constant or equal to zero, wherein said outer surface (41) of the housing (4) is intended to form part of an outer surface of a vehicle in use.

2. The system (1; 1'; 1") according to claim 1, characterized in that A distance (d1) between the at least one radio frequency antenna (21) and the outer surface (41) of the housing (4) is greater than or equal to 8 mm.

3. System (1; 1'; 1") according to claim 1 or 2, characterized in that The radar module (2) comprises at least two radio frequency antennas (21), one of which is linearly polarized for transmitting a transmission signal, and one of which is circularly polarized for receiving a return signal.

4. System (1; 1'; 1") according to any one of claims 1 to 3, characterized in that The transmit signal is a radio frequency signal having a center frequency between 5 GHz and 10 GHz.

5. System (1; 1'; 1") according to any one of claims 1 to 4, characterized in that The transmit signal is a radio frequency signal having a spectrum width greater than 500 MHz.

6. The system (1; 1'; 1”), characterized in that The housing (4) comprises: a mounting component or structural component (44) for a vehicle, provided with a recess (43) for accommodating the radar module (2); and a decorative plate (45) covering the recess (43) and forming the outer surface (41) of the housing (4).

7. The system (1') according to any one of claims 1 to 6, characterized in that The radar module (2) is fixed to the bottom of the housing (4) at a side opposite to the outer surface (41) of the housing.

8. System (1") according to any one of claims 1 to 7, characterized in that The radar module is equipped with at least one gasket (25) on one side of the outer surface (41) of the housing.

9. A motor vehicle equipped with a system (1; 1'; 1") according to any one of claims 1 to 8.

10. A motor vehicle as claimed in claim 9, wherein the system (1; 1'; 1') is located at a vehicle structural column, wherein the polarization axis (201) of the linearly polarized radio frequency antenna (21) is substantially parallel to the elongated axis of the column at an angle of about 10°.

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