Radar detector and interference suppression method using the same

Abstract

A radar detector and a method of interference suppression using the same. The radar detector includes a radar transmitting device, a radar receiving device, an analog-to-digital converter, and a digital processing unit. The radar transmitting device is configured to transmit a first wireless signal. The radar receiving device is configured to receive a second wireless signal to generate an analog reference signal when the first wireless signal is suppressed from being transmitted, and to receive a third wireless signal to generate an analog main signal when the first wireless signal is not suppressed from being transmitted. The analog-to-digital converter is configured to generate a digital reference signal from the analog reference signal, and to generate a digital main signal from the analog main signal. The digital processing unit is configured to adjust the digital main signal or the analog main signal according to the digital reference signal to suppress an interference component in the digital main signal or to suppress an interference component in the analog main signal.

Description

Technical Field

[0001] This invention relates to a radar detector using Doppler radar detection technology and a method for suppressing interference using the radar detector. Background Technology

[0002] Doppler radar detection technology is currently widely used in vehicle distance detection and object detection. Object detection using Doppler radar offers advantages such as high directivity, high accuracy, and long measurement range, but it is still susceptible to numerous external interferences, such as co-channel interference, aliased adjacent-channel interference caused by pulse compression, and baseband / IF-band interference. In particular, some objects themselves emit Doppler signals similar to those in the mid-frequency band (e.g., between 50Hz and 60Hz), which can interfere with object detection technology. Examples include light wave interference from fluorescent lamps and noise generated by the circuit boards in electronic devices. Therefore, suppressing or even eliminating interference and noise is one of the problems that Doppler radar object detection technology aims to solve. Summary of the Invention

[0003] This invention provides a radar detector and an interference suppression method using the radar detector. By detecting interference components in the current environment when suppressing the transmission of radar wave signals, and by appropriately adjusting the received signal based on the aforementioned interference components when transmitting radar wave signals, the interference on the original signal is reduced or suppressed.

[0004] The radar detector of the present invention includes a radar transmitter, a radar receiver, an analog-to-digital converter (ADC), and a digital processing unit. The radar transmitter transmits a first radio signal. The radar receiver is coupled to the radar transmitter. The radar receiver receives a second radio signal to generate an analog reference signal when the first radio signal is suppressed, and receives a third radio signal to generate an analog main signal when the first radio signal is not suppressed. The second and third radio signals contain interference components corresponding to interference. The input of the ADC is coupled to the radar receiver. The ADC generates a digital reference signal based on the analog reference signal and a digital main signal based on the analog main signal. The digital processing unit generates interference parameters based on the digital reference signal and adjusts the digital main signal or the analog main signal according to the interference parameters to suppress interference components in the digital main signal or the analog main signal.

[0005] The interference suppression method using a radar detector described in this invention is applicable to radar detectors including a radar transmitting device and a radar receiving device. The interference suppression method includes the following steps: suppressing the transmission of a first radio signal and receiving a second radio signal to generate an analog reference signal, wherein the first radio signal is transmitted by the radar transmitting device, and wherein the second radio signal contains an interference component corresponding to interference; generating a digital reference signal based on the analog reference signal; generating interference parameters based on the digital reference signal; not suppressing the transmission of the first radio signal and receiving a third radio signal to generate an analog main signal, wherein the third radio signal contains an interference component corresponding to interference; generating a digital main signal based on the analog main signal; and adjusting the digital main signal or the analog main signal according to the interference parameters to suppress the interference component in the digital main signal or the interference component in the analog main signal. Attached Figure Description

[0006] Figure 1 This is a block diagram of a radar detector according to the first embodiment of the present invention.

[0007] Figure 2 This is a detailed schematic diagram of a radar detector according to a second embodiment of the present invention.

[0008] Figure 3 This is a functional block diagram of the digital processing unit in the second embodiment of the present invention.

[0009] Figure 4 This is an example schematic diagram of a digital reference signal in the second embodiment of the present invention.

[0010] Figure 5 This is an example schematic diagram illustrating the interference estimation frequency estimated from the digital reference signal in the second embodiment of the present invention.

[0011] Figure 6 This is a timing diagram of the period estimator and filter in the second embodiment of the present invention when processing the digital reference signal and the digital main signal.

[0012] Figure 7A This is a detailed schematic diagram of a radar detector according to a third embodiment of the present invention.

[0013] Figure 7B This is a timing diagram illustrating the generation of digital reference signals and digital main signals according to an embodiment of the present invention.

[0014] Figure 8 This is a detailed schematic diagram of a radar detector according to the fourth embodiment of the present invention.

[0015] Figure 9 This is a flowchart illustrating an interference suppression method using a radar detector according to an embodiment of the present invention.

[0016] Symbol Explanation

[0017] 100, 200, 700, 800: Radar detectors

[0018] 102: Pedestrian

[0019] 110: Radar transmitting device

[0020] 120: Radar receiving device

[0021] 130: Analog-to-Digital Converter (ADC)

[0022] 140: Digital Processing Unit

[0023] 142: Processor

[0024] 150: Motion Detector

[0025] 212: Local Oscillator

[0026] 214: Power Amplifier

[0027] 216: Transmitting antenna end

[0028] 217: Transmitting Antenna

[0029] 221: Receiving antenna

[0030] 222: Receiving antenna end

[0031] 224: Low Noise Amplifier (LNA)

[0032] 226: Mixer

[0033] 310: Cycle Estimator

[0034] 320: Filter

[0035] 410, 420: Main interfering components

[0036] 742, 842: Subtractors

[0037] 744: Volterra Filter

[0038] 760: Programmable gain amplifier (PGA)

[0039] 770: Automatic Gain Controller

[0040] 780: Crosstalk Detector

[0041] 890: Digital-to-Analog Converter (DAC)

[0042] S910~S960: Steps in the method of jamming suppression using radar detectors

[0043] F: Frequency

[0044] n: Time sequence number

[0045] T0, T1, T2, TADC: Time points

[0046] PD1, PD2, PD3: Cycle

[0047] P1, P2: Stages

[0048] EN: Control signal

[0049] ONS: Oscillation Signal

[0050] N214: Receiver of the power amplifier

[0051] AS1: Analog signal

[0052] AS2: Amplify analog signal

[0053] Sc: Filtered digital signal

[0054] fc: Clock frequency

[0055] RWS1, RWS2, RWS3: Radar wave signals

[0056] Nadc: Input terminal of analog-to-digital converter

[0057] IIS: Interference Estimation Data

[0058] Scc: Interference Suppression Digital Signal

[0059] MR: Motion Detection Results

[0060] FP1: Update parameters

[0061] G: Programmable gain amplifier

[0062] IN1, IN2: Receiver terminals of the subtractor

[0063] PAS: Processed analog received signal

[0064] Sp: Digital primary signal

[0065] Sr: Digital reference signal

[0066] ASp: Analog Main Signal

[0067] ASr: Analog Reference Signal

[0068] AIIS: Analog Interference Estimation Data Detailed Implementation

[0069] Figure 1 This is a block diagram of a radar detector 100 according to a first embodiment of the present invention. The radar detector 100 can use Doppler radar detection technology to detect the movement of objects (e.g., pedestrian 102). The radar detector 100 mainly includes a radar transmitter 110, a radar receiver 120, an analog-to-digital converter (ADC) 130, and a digital processing unit 140.

[0070] Radar transmitter 110 is used to transmit a first radio signal (e.g., radar wave signal RWS1). Radar receiver 120 is coupled to radar transmitter 110. Radar receiver 120 is used to receive a second radio signal (e.g., radar wave signal RWS2) to generate an analog reference signal when radar wave signal RWS1 is suppressed. When radar wave signal RWS1 is not suppressed, radar receiver 120 receives a third radio signal (e.g., radar wave signal RWS3) to generate an analog main signal.

[0071] This section explains the suppression of radar signal RWS1 transmission and its implementation. In this embodiment, the suppression of radar signal RWS1 transmission can be implemented in several ways. For example, the radar transmitter 110 can be disabled to not transmit radar signal RWS1 (e.g., when the radar transmitter 110 is not activated); the radar transmitter 110 can be controlled to reduce the transmission intensity of radar signal RWS1; or, the radar transmitter 110 or the radar receiver 120 can be shielded from radar signal RWS1, so that the radar receiver 120 receives radar signal RWS2 when it is difficult or impossible to receive radar signal RWS1. In this way, radar signal RWS2 is the signal received by the radar receiver 120 with almost no influence from radar signal RWS1. Therefore, radar signal RWS2 should mainly contain interference components corresponding to the current environmental interference. That is, radar signal RWS2 can be used as the basis for generating an analog reference signal, so that the digital processing unit 140 of this embodiment can know the current environmental interference situation. In contrast, there are multiple ways to achieve "unsuppressed transmission of radar signal RWS1". For example, the radar transmitter 110 is enabled to transmit radar signal RWS1 (for example, when the radar transmitter 110 is activated); the radar transmitter 110 is controlled to increase the transmission strength of radar signal RWS1; or, the radar transmitter 110 or the radar receiver 120 is not shielded from radar signal RWS1, so that the radar receiver 120 can receive radar signal RWS3 of sufficient strength.

[0072] Radar detector 100 transmits radar wave signal RWS1 using radar transmitter 110. This radar wave signal RWS1 interacts with the environment to generate radar wave signal RWS3, which is then received by radar receiver 120. For example, when an object (e.g., pedestrian 102) is present in the environment, radar wave signal RWS1 will pass through the object and be reflected, generating radar wave signal RWS3, which is then received by radar receiver 120. In other words, radar wave signal RWS3 may contain the reflected signal from the object touched by radar wave signal RWS1. Radar wave signal RWS3 may contain information about the object's movement (e.g., Doppler frequency offset information) and information about interference components from the environment, while radar wave signal RWS2 mainly includes information about interference components from the environment.

[0073] The input terminal (Nadc) of ADC 130 is coupled to radar receiver 120. ADC 130 generates a digital reference signal based on an analog reference signal and a digital main signal based on an analog main signal. Digital processing unit 140 is coupled to ADC 130 and is used to generate interference parameters based on the digital reference signal, and to adjust the digital main signal or analog main signal according to the interference parameters to suppress interference components in the digital main signal or the analog main signal. Radar detector 100 may also optionally include motion detector 150. Motion detector 150 is coupled to digital processing unit 140 and determines the movement of an object (e.g., pedestrian 102) based on object movement information in the signal provided by digital processing unit 140. Figure 1 For details of each component, please refer to the following embodiments.

[0074] Figure 2 This is a detailed schematic diagram of a radar detector 200 according to a second embodiment of the present invention. Figure 2 200 medium radar detectors Figure 1 One implementation of the radar detector 100, and the radar detector 200 also includes a radar transmitter 110, a radar receiver 120, an analog-to-digital converter (ADC) 130, a digital processing unit 140, and optionally a motion detector 150.

[0075] The radar transmitting device 110 includes a local oscillator 212, a power amplifier 214, and a transmitting antenna terminal 216. The local oscillator 212 generates an oscillation signal ONS, including a clock frequency fc. The receiving terminal N214 of the power amplifier 214 is coupled to the local oscillator 212 to receive the oscillation signal ONS. The power amplifier 214 provides a modulation signal MS when the radar wave signal RWS is not suppressed during transmission. The transmitting antenna terminal 216 is coupled to the power amplifier 214. The transmitting antenna terminal 216 is coupled to a transmitting antenna 217. The transmitting antenna 217 is controlled by the power amplifier 214 through the transmitting antenna terminal 216. The transmitting antenna 217 is used to convert and transmit the modulation signal MS into a radar wave signal RWS1. In this embodiment, the power amplifier 214 can be selectively enabled or disabled via the control signal EN, and the output power of the power amplifier 214 can even be adjusted via the control signal EN, thereby adjusting the transmission strength of the radar wave signal RWS1.

[0076] The radar receiver 120 mainly includes a receiving antenna terminal 222, a low-noise amplifier (LNA) 224, and a mixer 226. The receiving antenna terminal 222 is coupled to a receiving antenna 221. The receiving antenna 221 receives radar signal RWS2 as analog signal AS1 when radar signal RWS1 is suppressed. Furthermore, when radar signal RWS1 is not suppressed, the receiving antenna 221 receives radar signal RWS3 as analog signal AS1 through the receiving antenna terminal 222. The low-noise amplifier 224 is coupled to the receiving antenna terminal 222. The low-noise amplifier 224 amplifies analog signal AS1 to become amplified analog signal AS2. The mixer 226 is coupled to the low-noise amplifier 224 and the local oscillator 212 in the radar transmitter 110. Mixer 226 mixes the amplified analog signal AS2 with the clock frequency fc of the radar wave signal RWS1 from the local oscillator 212, thereby generating an analog reference signal when the radar wave signal RWS1 is suppressed and an analog main signal when the radar wave signal RWS1 is not suppressed. Radar receiver 120 obtains the clock frequency fc of the radar wave signal RWS1 from radar transmitter 110 and mixes the amplified analog signal AS2 with the clock frequency fc, which can enhance the information in the amplified analog signal AS2 that is approximately located at the clock frequency fc, thereby making it easier to obtain the radar wave signal RWS3 containing object movement information and enhancing the gain of the received information.

[0077] The ADC 130 generates a digital reference signal Sr based on an analog reference signal and a digital master signal Sp based on an analog master signal. Figure 2The digital processing unit 140 illustrates a switcher 141 and a processor 142. It should be noted that the switcher 141 is primarily used to explain the generation of a digital primary signal Sp and a digital reference signal Sr depending on whether the radar signal RWS1 is suppressed during transmission. In implementing this embodiment, it is not necessarily required to implement the switcher 141; it can be implemented using software, firmware, or hardware. Furthermore, the function of the switcher 141 can distinguish the digital primary signal Sp and the digital reference signal Sr through different timing sequences (e.g., "radar signal RWS1 is suppressed during transmission" and "radar signal RWS1 is not suppressed during transmission") and perform digital processing. For example, the radar wave signal can be operated in pulse compression mode, and the radar wave signal is transmitted and received in pulse mode. ADC 130 can be a non-continuous ADC to realize the function of switch 141. It can digitally process radar wave signals RWS3 and RWS2 at different times, generating a digital primary signal Sp and a digital reference signal Sr at different times. The non-continuous ADC can be, for example, a SAR ADC (Successive-Approximation ADC). The processor 142 in the digital processing unit 140 can have different circuit structures depending on the embodiment, as described in the following embodiments.

[0078] Figure 3 This is a functional block diagram of the digital processing unit 140 in the second embodiment of the present invention. The digital processing unit 140 may include a period estimator 310 and a filter 320. In this embodiment, the period estimator 310 and the filter 320 may be integrated into... Figure 2 In processor 142, when radar signal RWS1 is suppressed, period estimator 310 receives digital reference signal Sr to evaluate at least one interference estimation frequency in digital reference signal Sr, thereby generating interference parameter IFS. Furthermore, when radar signal RWS1 is not suppressed, filter 320 obtains digital master signal Sp and filters out data in digital master signal Sp located at the aforementioned interference estimation frequency according to interference parameter IFS to generate filtered digital signal Sc. Digital reference signal Sr mainly contains interference components, while digital master signal Sp simultaneously contains interference components and movement information for detecting objects. In this embodiment, filter 320 can be implemented by one or more notch filters. According to interference parameter IFS, each notch filter receives the corresponding interference estimation frequency to filter the analog master signal or digital master signal to generate filtered digital signal Sc.

[0079] Figure 4This is an example schematic diagram of the digital reference signal Sr in the second embodiment of the present invention. Figure 5 This is an example schematic diagram illustrating the interference estimation frequency estimated by the digital reference signal Sr in the second embodiment of the present invention. Figure 4 The horizontal axis in the diagram represents the time sequence number n of the received digital reference signal Sr. Figure 4 The vertical axis represents the DC voltage value at the corresponding time number n in the digital reference signal Sr. Figure 5 This is a schematic diagram of the interference estimation frequency after the period estimator 310 evaluates the digital reference signal Sr. Figure 5 The horizontal axis represents the frequency F, and the vertical axis represents the corresponding energy intensity. Here, we use... Figure 4 The digital reference signal Sr shown is Figure 5 The frequencies 'f0', '2×f0', and '3×f0' shown are examples; please refer to other sources as well. Figures 3 to 5 Due to the digital reference signal Sr (e.g. Figure 4 As shown, the digital reference signal Sr mainly contains multiple interference components. The period estimator 310 evaluates the frequencies corresponding to information (i.e., interference components) with relatively strong energy (e.g., energy intensity greater than a certain value) in the digital reference signal Sr. Figure 5 The frequencies 'f0', '2×f0', '3×f0', etc., are integrated into the interference parameter IFS and provided to filter 320. In detail, Figure 4 The occurrence period between the main interfering components 410 and 420 is T0, therefore Figure 5 The frequency 'f0' and the period T0 are reciprocals of each other (that is, T0 = 1 / f0).

[0080] Figure 6This is a timing diagram of the period estimator 310 and filter 320 in the second embodiment of the present invention processing the digital reference signal Sr and the digital main signal Sp. Time point T0 represents the start-up time of the radar detector 100. At this time, the radar wave signal RWS1 is suppressed, so the period estimator 310 receives the digital reference signal Sr and evaluates frequencies such as 'f0', '2×f0', '3×f0', etc., to generate interference parameters IFS. This is referred to here as the interference estimation frequency evaluation stage P1. Time point T0 represents the end time of the interference estimation frequency evaluation stage P1. Immediately or slightly after the interference estimation frequency evaluation stage P1, stage P2 can be entered. At this time, the radar wave signal RWS1 is not suppressed, so the filter 320 performs filtering operations on the digital main signal Sp according to each interference estimation frequency in the interference parameters IFS, thereby filtering out interference components and generating a filtered digital signal Sc. That is, the interference components in the digital main signal Sp can be suppressed or even eliminated through the operation of the period estimator 310 and the filter 320. After phase P2 ends, phase P1 will be entered again immediately or shortly thereafter to assess the interference estimation frequency. Figure 1 and Figure 2 The motion detector determines the motion of an object based on the filtered digital signal Sc.

[0081] The digital processing unit 140 and the motion detector 150 of the second embodiment of the present invention can be implemented by integrated circuits, and the digital processing unit 140 mainly uses integrated circuits. Figure 3 The period estimator 310, combined with the filter 320, filters out interference components in the digital master signal Sp. Users of this embodiment can also filter out interference components in the digital master signal Sp or the analog master signal using other methods. Figure 7A This is a detailed schematic diagram of a radar detector 700 according to a third embodiment of the present invention. Figure 7A Radar Detector 700 and Figure 2 The main difference in radar detector 200 lies in the design of digital processing unit 140, as well as the addition of programmable gain amplifier (PGA) 760, automatic gain controller (AGC) 770, and crosstalk detector 780. Figure 7BThis embodiment illustrates the timing diagram for the generation of the digital reference signal Sr and the digital master signal Sp. When the radar wave signal RWS1 is suppressed, the ADC 130 generates the digital reference signal Sr based on the corresponding analog reference signal ASr. When the radar wave signal RWS1 is not suppressed, the ADC 130 generates the digital master signal Sp based on the corresponding analog master signal ASp. This embodiment is illustrated using the operation of a pulse compression radar. Therefore, the radar wave signal is transmitted and received in pulse form. The switcher alternately generates the digital reference signal Sr and the digital master signal Sp to generate digital timing signals. The non-continuous ADC generates digital timing signals and transmits them to the back-end digital signal processing unit (such as a Woltera filter). The ADC sampling period for the analog reference signal ASr or the analog master signal ASp is PD1, the ADC switching period for the reference signal Sr and the master signal Sp is PD2, the operation period of the non-continuous ADC is PD3, and the non-continuous ADC outputs the corresponding digital reference signal Sr or digital master signal Sp at time TADC.

[0082] Figure 7A The radar detector 700 includes a subtractor 742 and a Volterra filter 744. When the radar signal RWS1 is suppressed, the Volterra filter 744 receives a digital reference signal Sr and uses an adaptive Volterra algorithm to operate on the digital reference signal Sr to update the Volterra coefficients, thereby obtaining interference estimation data IIS as the aforementioned interference parameter. When the radar signal RWS1 is not suppressed, the subtractor 742 adjusts the digital master signal Sp or the analog master signal according to the interference estimation data IIS, thereby suppressing interference components in the digital master signal Sp or the analog master signal. In this embodiment, when the radar signal RWS1 is suppressed, the Volterra coefficients are updated when the positive receiving end of the subtractor 742 is not input with the digital master signal Sp, in order to obtain the interference estimation data IIS as the aforementioned interference parameter. When the radar signal RWS1 is not suppressed, the positive receiving end of the subtractor 742 receives the digital master signal Sp, and the negative receiving end receives the interference estimation data IIS. In this embodiment, the subtractor 742 is located in the digital chip, so the digital master signal Sp can be directly adjusted. For example, the interference estimation data ISS is subtracted from the digital master signal Sp to generate the interference suppression digital signal Scc, thereby suppressing the interference components in the digital master signal Sp. Figure 7A The motion detector 150 generates a motion detection result MR based on the interference suppression digital signal Scc.

[0083] The crosstalk detector 780 is primarily used to generate the Volterra coefficient update parameter FP1 based on one of the main digital signal Sp and the interference suppression digital signal Scc, and / or the motion detection result MR, and provides the update parameter FP1 to the coefficient update unit of the Volterra filter 744. Figure 7A In one embodiment, in the first mode (normal case), the crosstalk detector 780 provides the interference suppression digital signal Scc as the update parameter FP1 to the Volterra filter 744; while in the second mode, when the crosstalk detector 780 determines that the object is moving based on the motion detection result MR, or detects that the energy of the interference suppression digital signal Scc exceeds the threshold, the crosstalk detector 780 will not provide the interference suppression digital signal Scc as the update parameter FP1 to the Volterra filter 744, for example, it can output 0 as the update parameter FP1.

[0084] The Volterra filter 744 adjusts the Volterra coefficients of the adaptive Volterra algorithm based on the updated parameter FP1. This allows the adaptive Volterra algorithm to dynamically adjust the interference estimation data IIS based on either the digital principal signal Sp or the interference suppression digital signal Scc, thereby indirectly or directly adjusting the digital principal signal Sp. In this embodiment, the Volterra coefficients can be updated using the Least-Mean-Square (LMS) algorithm. Figure 7A In one embodiment, the Volterra filter 744 adjusts the Volterra coefficients based on the updated parameter FP1, thereby dynamically adjusting the interference estimation data IIS according to the interference suppression digital signal Scc, and thus directly adjusting the digital master signal Sp. In other embodiments, the crosstalk detector 780 can be omitted, allowing the Volterra filter 744 to directly adjust the Volterra coefficients of the adaptive Volterra algorithm in the Volterra filter 744 according to the interference suppression digital signal Scc.

[0085] The PGA 760 is coupled between the mixer 226 and the ADC 130. The PGA 760 amplifies the analog reference signal or analog master signal supplied from the mixer to the PGA 760 based on the programmable gain G. An automatic gain controller (AGC) 770 is coupled to the PGA 760. The AGC 770 determines the programmable gain G in the PGA 760 based on the signal-to-noise ratio (SNR) in the radar signal RWS3. In this embodiment, the PGA 760 is located in the analog region of the radar detector 700 (e.g., on a circuit board), and the AGC 770 can adaptively adjust the programmable gain G in the PGA 760 based on various conditions or digital signals. Therefore, the AGC 770 can be located in the analog or digital region of the radar detector 700 (e.g., in an integrated circuit).

[0086] Figure 7A Subtractor 742 is disposed in the digital area (e.g., integrated circuit) of radar detector 700. Alternatively, users of this embodiment can also dispose of the subtractor in the analog area (e.g., circuit board) of radar detector 700. Figure 8 Please provide an explanation. Figure 8 This is a detailed schematic diagram of a radar detector 800 according to a fourth embodiment of the present invention. Figure 8 Radar Detector 800 and Figure 7A The main difference in the radar detector 700 is that the subtractor 842 has been moved from the digital area to the analog area. Furthermore, Figure 8 The radar detector 800 also includes a digital-to-analog converter (DAC) 890. The DAC 890 is used to convert... Figure 8 Interference estimation data IIS is converted from digital to analog form to produce analog interference estimation data AIIS.

[0087] The positive receiving terminal IN1 of subtractor 842 is coupled to the output of mixer 226 of radar receiver 800. The negative receiving terminal IN2 of subtractor 842 receives analog interference estimation data AIIS. In this embodiment, when radar signal RWS1 is suppressed, the Volterra coefficient is updated by receiving an analog reference signal from the output of mixer 226 via the positive receiving terminal IN1 of subtractor 842 to obtain interference estimation data IIS as interference parameters and the corresponding analog interference estimation data AIIS. When radar signal RWS1 is not suppressed, the positive receiving terminal IN1 of subtractor 842 receives an analog received signal from the output of mixer 226. Subtractor 842 subtracts the analog interference estimation data AIIS from this analog received signal to generate a processed analog received signal PAS as the analog master signal. This analog master signal can be amplified by PGA 760 and converted by ADC 130 to become a digital master signal Sp. When the radar signal RWS1 is not suppressed during transmission, the ADC 130 converts the analog master signal (i.e., the processed analog received signal PAS) into a digital master signal Sp, thereby suppressing interference components in either the digital master signal Sp or the analog master signal. Figure 8 In one embodiment, in the first mode (normal case), the crosstalk detector 780 provides the digital primary signal Sp as an update parameter FP1 to the Volterra filter 744. In the second mode, when the crosstalk detector 780 determines object motion based on the motion detection result MR, or detects that the energy of the digital primary signal Sp exceeds a threshold, the crosstalk detector 780 will not provide the digital primary signal Sp as an update parameter FP1 to the Volterra filter 744; for example, it may output 0 as the update parameter FP1. The Volterra filter 744 adjusts the Volterra coefficients according to the update parameter FP1, thereby dynamically adjusting the interference estimation data IIS based on the interference suppression digital signal Scc, and indirectly adjusting the digital primary signal Sp. Figure 7BThe timing diagram used to illustrate the generation of the digital reference signal Sr and the digital principal signal Sp can also be applied to this embodiment. The main difference is that when the radar signal RWS1 is suppressed, the ADC 130 generates the digital reference signal Sr based on the analog reference signal ASr output by the subtractor 842, and when the radar signal RWS1 is not suppressed, the ADC 130 generates the digital principal signal Sp based on the analog principal signal ASp output by the subtractor 842. This embodiment reduces the chance of ADC 130 overload, so the automatic gain controller 770 is less likely to reduce the gain in the PGA 760. Therefore, even when there is strong ambient interference and strong Leyle frequency offset information, the signal-to-noise ratio (SNR) of the ADC 130 can still be maintained. In other embodiments, the PGA 760 setting can also be selectively omitted. Figure 7A The ADC 130 can be directly coupled to the mixer 226, or Figure 8 The ADC130 can be directly coupled to the subtractor 842.

[0088] Figure 9 This is a flowchart illustrating an interference suppression method using a radar detector according to an embodiment of the present invention. Figure 9 The interference suppression method is applicable to Figure 1 , Figure 2 ,picture Figure 7A and Figure 8 Among the radar detectors 100, 200, 700, and 800. Here, using... Figure 1 Radar detector 100 and Figure 9An example of an interference suppression method is provided. In step S910, the transmission of a first radio signal (i.e., radar wave signal RWS1) is suppressed, and a second radio signal (i.e., radar wave signal RWS2) is received through radar receiver 120 to generate an analog reference signal. Radar wave signal RWS1 is transmitted by radar transmitter 110, and radar wave signal RWS2 contains interference components corresponding to interference. In step S920, ADC 130 generates a digital reference signal based on the analog reference signal. In step S930, digital processing unit 140 generates interference parameters based on the digital reference signal. In step S940, the transmission of radar wave signal RWS1 is not suppressed, and a third radio signal (i.e., radar wave signal RWS3) is received to generate an analog main signal. Radar wave signal RWS3 may contain object movement information (such as Doppler frequency offset information) and interference components corresponding to interference. In step S950, digital processing unit 140 generates a digital main signal based on the analog main signal. In step S960, the digital processing unit 140 adjusts the digital main signal or the analog main signal according to the interference parameters to suppress interference components in the digital main signal or the analog main signal. For details of the aforementioned steps S910 to S960, please refer to the aforementioned embodiments.

[0089] In summary, the radar detector and interference suppression method using the radar detector of this embodiment of the present invention detect interference components in the current environment when suppressing the transmitted radar wave signal (i.e., the first radar wave signal), and analyze the degree of interference in these interference components to generate interference parameters. Furthermore, when there is a transmitted radar wave signal (i.e., the first radar wave signal), the received signal is appropriately adjusted using the aforementioned interference parameters to reduce or suppress interference on the original signal. Moreover, in object detection radar detectors using Doppler radar, this embodiment not only reduces the impact of AC narrowband interference but also increases the antenna gain of the radar receiver and reduces power consumption.

Claims

1. A radar detector, characterized in that, include: A radar transmitter for transmitting a first radio signal; A radar receiver coupled to the radar transmitter is configured to receive a second radio signal and generate an analog reference signal when the first radio signal is suppressed, and to receive a third radio signal and generate an analog main signal when the first radio signal is not suppressed, wherein the second radio signal and the third radio signal contain interference components corresponding to an interference. An analog-to-digital converter, the input of which is coupled to the radar receiver to generate a digital reference signal based on the analog reference signal, and to generate a digital main signal based on the analog main signal; A digital processing unit is configured to generate an interference parameter based on the digital reference signal, and to adjust the digital master signal or the analog master signal according to the interference parameter to suppress interference components in the digital master signal or the analog master signal, comprising: A Volterra filter, Specifically, when the first wireless signal is suppressed, the Volterra filter receives the digital reference signal and uses an adaptive Volterra algorithm to process the digital reference signal to obtain interference estimation data as the interference parameter; and A subtractor that adjusts the digital primary signal or the analog primary signal based on the interference estimation data when the first wireless signal is not suppressed.

2. The radar detector as described in claim 1, characterized in that, The digital processing unit includes: One-cycle estimator; and A filter; Specifically, when the first wireless signal is suppressed, the period estimator receives the digital reference signal to evaluate at least one interference estimation frequency and generate the interference parameter. Furthermore, when the first wireless signal is not suppressed during transmission, the filter obtains the digital primary signal and filters out data located at the at least one interference estimation frequency from the digital primary signal to generate a filtered digital signal.

3. The radar detector as described in claim 2, characterized in that, Also includes: A motion detector is coupled to the digital processing unit. The motion detector uses the filtered digital signal to determine the motion of an object. Wherein, when the first wireless signal is not suppressed from transmission, the third wireless signal includes a reflected signal that is touched by the object and reflected by the first wireless signal.

4. The radar detector as described in claim 1, characterized in that, The digital processing unit includes the subtractor, wherein, When the first wireless signal is not suppressed during transmission, the subtractor subtracts the interference estimation data from the digital main signal to generate an interference-suppressed digital signal.

5. The radar detector as described in claim 4, characterized in that, Also includes: A motion detector, The motion detector determines the motion of an object based on either the primary digital signal or the interference suppression digital signal to generate a motion detection result. Wherein, when the first wireless signal is not suppressed from transmission, the third wireless signal includes a reflected signal that is touched by the object and reflected by the first wireless signal.

6. The radar detector as described in claim 5, characterized in that, Also includes: A series of interference detectors The crosstalk detector generates an updated parameter based on one of the main digital signal and the interference suppression digital signal, as well as the motion detection result. The Volterra filter adjusts a Volterra coefficient of the adaptive Volterra algorithm in the Volterra filter according to the updated parameter.

7. The radar detector as described in claim 4, characterized in that, The Volterra filter adjusts a Volterra coefficient in the adaptive Volterra algorithm based on the interference suppression digital signal.

8. The radar detector as claimed in claim 1, characterized in that, Also includes: A digital-to-analog converter is used to convert the interference estimation data from digital to analog form. The subtractor has a first receiving end coupled to the output of a mixer in the radar receiving device, and a second receiving end receiving the interference estimation data in analog form. When the first radio signal is not suppressed, the first receiving end of the subtractor receives an analog received signal from the output of the mixer. The subtractor subtracts the analog interference estimation data in analog form from the analog received signal to generate a processed analog received signal as the analog master signal. Furthermore, the analog-to-digital converter converts the analog primary signal into the digital primary signal.

9. The radar detector as claimed in claim 1, characterized in that, The radar transmitting device includes: A local oscillator is used to generate an oscillation signal including a clock frequency; A power amplifier, the receiver of which is coupled to the local oscillator to receive the oscillation signal and to provide a modulated signal for wireless signals; and A transmitting antenna is coupled to the power amplifier for control by the power amplifier to convert and transmit the modulated signal into the first wireless signal.

10. The radar detector as claimed in claim 9, characterized in that, The radar receiving device includes: A receiving antenna receives the second wireless signal as a first analog signal when the first wireless signal is suppressed from transmission, and receives the third wireless signal as the first analog signal when the first wireless signal is not suppressed from transmission. A low-noise amplifier, coupled to the receiving antenna, amplifies the first analog signal to become an amplified analog signal. A mixer is coupled to the low-noise amplifier and the local oscillator in the radar transmitter, wherein the mixer mixes the first amplified analog signal according to the clock frequency of the first radio signal from the local oscillator, thereby generating the analog reference signal when the first radio signal is suppressed from transmission and generating the analog main signal when the first radio signal is not suppressed from transmission.

11. The radar detector as claimed in claim 10, characterized in that, Also includes: A programmable gain amplifier is coupled between the mixer and the analog-to-digital converter to amplify the analog reference signal or the analog main signal according to a programmable gain. as well as An automatic gain controller is coupled to the programmable gain amplifier. The automatic gain controller determines the programmable gain based on the signal-to-noise ratio in the third wireless signal.

12. An interference suppression method using a radar detector, characterized in that, The interference suppression method is applicable to a radar detector including a radar transmitter and a radar receiver, and includes: The transmission of a first wireless signal is suppressed, and a second wireless signal is received to generate an analog reference signal, wherein the first wireless signal is transmitted by the radar transmitter, and the second wireless signal contains an interference component corresponding to an interference. A digital reference signal is generated based on the analog reference signal; An interference parameter is generated based on the digital reference signal, and an adaptive Volterra algorithm is used to calculate the digital reference signal to obtain interference estimation data as the interference parameter. The first wireless signal is not suppressed from being transmitted, and a third wireless signal is received to generate an analog main signal, wherein the third wireless signal contains an interference component corresponding to the interference. A digital master signal is generated based on the analog master signal; Adjusting the digital master signal or the analog master signal according to the interference parameter to suppress interference components in the digital master signal or the analog master signal, including: Adjust the digital primary signal or the analog primary signal based on the interference estimation data; as well as The motion of an object is determined based on the adjusted digital signal, wherein, when the first wireless signal is not suppressed, the third wireless signal includes a reflected signal that is touched by the first wireless signal and reflected from the object.

13. The interference suppression method as described in claim 12, characterized in that, The steps to suppress the transmission of the first wireless signal include: The radar transmitter must be disabled; Reduce the transmission strength of the first wireless signal; or The first wireless signal is shielded from the radar transmitter or the radar receiver.

14. The interference suppression method as described in claim 12, characterized in that, The steps for generating the interference parameter based on the digital reference signal include: The interference parameter is generated by evaluating at least one interference estimation frequency of the digital reference signal.

15. The interference suppression method as described in claim 14, characterized in that, The steps for adjusting the digital master signal or the analog master signal based on the interference parameter include: Data located at the at least one interference estimation frequency in the primary digital signal is filtered out to generate a filtered digital signal. Furthermore, the interference suppression method also includes: The motion of an object is determined based on the filtered digital signal, wherein, when the first wireless signal is not suppressed, the third wireless signal includes a reflected signal that is touched by the first wireless signal and reflected.

16. The interference suppression method as described in claim 12, characterized in that, The steps for adjusting the digital primary signal or the analog primary signal based on the interference estimation data include: When the first wireless signal is not suppressed during transmission, the interference estimation data is subtracted from the digital primary signal to generate an interference-suppressed digital signal; and The motion of an object is determined based on one of the main digital signal and the interference suppression digital signal to generate a motion detection result.

17. The interference suppression method as described in claim 12, characterized in that, Also includes: An updated parameter is generated based on one of the main digital signal and the interference-suppressed digital signal, as well as the motion detection result; as well as The Volterra coefficients of the adaptive Volterra algorithm in the Volterra filter are adjusted according to the updated parameters.

18. The interference suppression method as described in claim 12, characterized in that, Also includes: The Volterra coefficient of the adaptive Volterra algorithm in the Volterra filter is adjusted based on the interference suppression digital signal.

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