• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for monitoring the integrity of a Doppler transceiver, wherein a Doppler transceiver comprises a transmitter unit, a receiver unit, and a mixer unit, wherein a signal is transmitted from the transmitter, characterized in that the transmitted signal is at least partially sent to a modulation unit, where the sent signal is modulated according to certain parameters, and the modulated signal is transmitted to the receiver unit. The invention also relates to a Doppler transceiver comprising an emitter unit and a receiver unit having at least one antenna (34,54,66,74,90,96) and a mixer unit (38,64), characterized in that it further comprises a modulation unit (48,70,86,106) which is electrically disconnected from the antenna (34,54,66,74,90,96).
    公开号:BE1019955A3
    申请号:E2011/0238
    申请日:2011-04-26
    公开日:2013-03-05
    发明作者:Yves Borlez
    申请人:Bea Sa；
    IPC主号:
    专利说明:

    Surveillance system for a transceiver
    Doppler
    The present invention relates to a method for monitoring the integrity of a Doppler transceiver according to the preamble of claim 1 and to a corresponding device according to the preamble of claim 9.
    Doppler sensors are well known as motion detectors. An oscillator generates a signal, usually an electromagnetic wave, having a certain frequency that is transmitted from an antenna to detect the motion of an object. A wave whose frequency has slipped is reflected by the object and received by an antenna. The signal frequency varies according to the speed and direction of the detected object relative to the transceiver. In order to determine the difference frequency, the outgoing and incoming signals are mixed in a mixer unit. The difference frequency or Doppler frequency can be processed in a processing unit, and, for example, controls an automatic gate. It is desirable that, in the case of automatic doors, the doors can be positioned in a safe (open) state, if the motion sensor is not functioning properly, to prevent people from being locked inside. a building, for example in case of fire. So, monitoring the integrity of the motion sensor is necessary. By extension, some Doppler sensors can also be used for presence and / or distance detection. In this case, the frequency of the transmitted signal is modulated. Therefore the time required by the wave to go from the transmitter to the target and from the target to the receiver will cause a slip. frequency between the transmitted wave and the wave reflected by the object even if the object does not move. The frequency slip varies according to the distance between the Doppler sensors and the target. In order to determine the difference frequency, the outgoing and incoming signals are mixed in a mixer unit. The difference frequency can be processed in a processing unit to define the presence and distance of the fixed target. For the same reasons as for Doppler motion sensors, monitoring the integrity of such presence and / or distance sensors is also necessary.
    In order to monitor the integrity of a microwave Doppler transceiver, a method is known for modulating the amplitude and / or the frequency of the transmitted signal by modulating the power supply of the oscillator. The transmitted signal also passes through the mixer unit to be mixed with the received signal to obtain the Doppler frequency. (See, for example, EP 0411 234 B1).
    This method, however, is not able to detect antenna failures because most of the modulation passes through the mixer unit directly. In addition, this approach is very dependent on oscillator modulation capacity of the oscillator and the coupling factor between the mixer and the oscillator. These parameters are difficult to control, especially with low cost units designed for mass production.
    The object of the invention is to provide a monitoring of the integrity of a microwave Doppler transceiver avoiding the drawbacks of the state of the art.
    The use of a method for monitoring the integrity of a Doppler transceiver, where the Doppler transceiver comprises an oscillator, an emitter unit, a receiver unit and a mixer unit, is known in the art. the state of the art. The output of the mixer unit is connected to a processing unit. The transmitted signal is modulated to monitor the integrity of the transceiver.
    According to the invention, the method for monitoring a transceiver is characterized in that monitoring is performed by providing transceiver stimulation through microwave coupling of a transceiver modulation device. [LSI]. Thus, according to the invention, the signal is transmitted from the transmitter unit, it is then sent to a modulation unit, which modulates the signal according to defined modulation parameters. After that, the modulated signal is sent back to the receiver unit. In the additional method, the received modulated signal, where a certain modulation level is set, is mixed with the signal transmitted in the mixer. The detected modulation is measured by the processing unit and compared to an expected value. If the detected modulation level is different than expected, it can be assumed that there is a failure in the transceiver system. Depending on the modulation gap, a failure can easily be determined. The modulation circuit is triggered continuously or periodically to control the integrity of the transceiver. The transceiver integrity is checked at regular time intervals. In this way, the performance of the entire transceiver, including radiating antennas, can be maintained.
    In the case of a single antenna transceiver, the transmitted signal can be sent via a coupling unit to the modulation unit and then modulated with certain parameters. The modulated signal is returned to the antenna and received by the transceiver in this manner. The received signal is mixed with the transmitted signal. In this way, the demodulated IF signal is obtained. The IF signal is compared to the expected level. This comparison. detect a transceiver failure.
    Alternatively, a similar method within the scope of the invention may be used to monitor the integrity of a transceiver comprising at least two antennas where the first antenna is a transmitting antenna and the second antenna is a receiving antenna . An unmodulated signal is transmitted by the transmitting antenna. It is then sent to a coupling unit and the signal is transferred to a modulation unit where certain defined parameters are modulated on the signal. The parameters may be implemented on the modulation unit unchangeably or may be influenced by a processing unit. In any case, the modulated signal is then transferred to a coupling unit, and returned to the receiving antenna. It is then transferred to a mixer unit where it is mixed with the transmitted signal to obtain the demodulated IF signal. The comparison of the IF signal parameters obtained and the expected parameters makes it possible to detect a transceiver failure. Advantageously, the modulation parameters may relate to amplitude, frequency, or phases. Likewise, combinations of these parameters are within the scope of the present invention.
    The coupling of the modulation unit to the antenna, as described in the previous method can be performed with wire or wireless. The important point is that the signal, unlike the state of the art, is sent from and to the antenna, which allows to include the control of the antenna in the integrity control of the sensor. By using a wireless type of coupling, the antenna radiation characteristics could further be monitored. Wireless coupling leads to coupling at RF frequencies while wire coupling may also allow coupling at low frequencies.
    A further aspect of the invention is a device for performing the method. The device for monitoring the integrity of a Doppler transceiver comprises a Doppler transceiver as well as at least one coupling unit and a modulation unit. The transceiver comprises a processing unit which determines the deviation of the received IF signal from the expected IF signal. when a modulation is applied. An advantageous aspect of the invention is that there can be total low frequency electrical decoupling between the modulation circuit and the transceiver in the case of wireless coupling. This is particularly desirable to ensure proper testing of the device without any direct galvanic current flow through any part of the device under test.
    In a first preferred embodiment, the reflection modulator may be composed of a semiconductor whose impedance varies according to a modulation signal having a frequency within the IF bandwidth of the transceiver. The modulation unit may in particular comprise a single PIN or microwave Schottky diode, or a transistor having the above-mentioned characteristic. Depending on the modulation, the reflection coefficient of the modulator will then vary and a signal that is different in phase and amplitude will be sent back to the antenna. According to the invention, this applied signal will cause an IF signal detected at the IF output of the mixer. This output signal can be processed by the processing unit and classified as the correct response of the transceiver under the calibrated stimulation applied.
    In a second preferred embodiment, the transmitter unit and the receiver unit may be constructed with at least one antenna used to transmit and receive. Several antenna configurations can be used to modify the radiation pattern of the radar, but are each used, namely, to transmit as well as to receive. In the present embodiment, the coupling unit is connected to a modulation unit where the modulation unit comprises a type of reflection modulator providing different reflection coefficients according to the modulation. The reflection modulator reflects the modulated signal to the antenna, where it is sent to the receiver unit.
    In a further embodiment, the transceiver comprises at least one transmitting antenna and at least one receiving antenna. In this case, there are two separate coupling structures.
    As we know, the state of the art, a coupling unit interconnecting the antenna supply lines, does not control whether the antennas work or not.
    According to the invention, the coupling structure is advantageously arranged in the vicinity of the antennas, including these in the entire monitoring chain. Due to the high sensitivity of the Radar transceivers and the proximity of the coupling structure to the antenna, only a slight coupling is necessary. Therefore, the coupling will have a negligible effect on the antenna radiation characteristics. The slight coupling is always sufficient to ensure the correct operation of the monitoring circuit.
    Alternatively, the coupling can be made with wire, where the modulation unit is galvanically coupled to the antennas.
    If the inclusion of antennas in the monitoring chain is not mandatory, a fairly satisfactory amount of monitoring can be provided by providing modulation directly on (or between) the transmission line (s) connecting to the antennas.
    In a very advantageous embodiment, the coupling unit and the modulation unit can be arranged on the same platform as the antennas of the transceiver. This allows a compact transceiver arrangement including an integrity check circuit.
    Such a monitoring method can be advantageously used to monitor radar movement sensors mounted on doors or automatic or manual barriers, preferably installed on escape routes.
    Additional advantages, features and potential applications of the present invention will be apparent from the following description in conjunction with the embodiments illustrated in the drawings.
    In the entirety of the description, the claims and the drawings, the associated terms and reference signs, which are presented in the attached list of reference signs, are used. In the drawings: FIG. 1 illustrates the principle of operation of a Doppler transceiver of the state of the art; Figure 2 illustrates the principle of monitoring a single antenna transceiver; Figure 3 illustrates the principle of monitoring a two-antenna transceiver; FIG. 4 illustrates an embodiment of the invention according to a single antenna transceiver equipped with a wireless coupling unit; FIG. 5 illustrates an example according to a two-antenna transceiver, and FIG. 6 illustrates an embodiment of the invention according to a single antenna transceiver equipped with a wire coupling unit.
    Figure 1 shows a Doppler transceiver 10 known in the state of the art. The Doppler transceiver 10 includes a local oscillator 12 and a single antenna 14. The antenna 14 includes a feed point 16, which is connected to the oscillator 12. In addition, the Doppler transceiver 10 comprises a mixer unit 18. The mixer unit 18 is connected by a coupling structure 17 along the transmission line 22 connecting the oscillator 12 to the antenna feed point 16.
    In order to detect a movement of an object 20 the local oscillator 12 generates a signal LO which is transmitted via the antenna 14 at a certain frequency F0. The transmitted signal will be reflected by the object 20. The frequency of the RF reflected signal is shifted and the signal is modulated according to the movement of the object 20, in particular according to the direction and speed of the object 20. The reflected signal RF is received by the antenna 14 having a frequency which is reduced or increased by the FD Doppler frequency. In the additional method, the transmitted signal LO with the frequency F0 and the received signal RF having the frequency Fo ± Fd are mixed in the mixer unit 18. After mixing the transmitted and received signals, an IF signal having the frequency difference F0 is obtained at the intermediate frequency output of the IF mixer.
    According to the state of the art, to monitor the integrity of the transceiver, the output signal is modulated by influencing the oscillator 12. With this method of monitoring a Doppler transceiver 10, a disconnection of the antenna beyond the coupling point 17, for example at position 16, is not detectable. A processing unit connected to the intermediate frequency output of the mixer unit would detect no frequency difference, as if there is no "no movement" in the detection range when the antenna is disconnected. Nevertheless, since the mixer 18 is still connected to the oscillator 12, the modulation applied to the oscillator will always be detected. Therefore, a logout error would not result in an error handling procedure.
    FIG. 2 illustrates a schematic view of the principle for monitoring the integrity of a Doppler transceiver 30 comprising an oscillator 32 and a single antenna 46, connected via a feed point 34, as well as a mixer structure 38 and a processing unit 40. According to the invention, the transceiver 30 also comprises a coupling unit 42 and a reflection modulator 44, where the coupling unit 42 is connected to the reflection modulator 44 In addition, the reflection modulator 44 may be linked to the processing unit 40.
    To control the integrity of the transceiver 30, the usual microwave signal LO is generated by the oscillator 32 and transmitted via the antenna 46. This signal is sent by the coupling unit 42 and transferred to the reflection modulator 44. The reflection modulator modulates the signal according to the parameters and sends the modulated signal RF back to the antenna 46 of the transceiver 30. The outgoing signal LO having the oscillator frequency F0 thus that the RF modulated signal passes through the mixer unit 38 via the coupling structure 36. After mixing the two LO and RF signals, a resulting IF signal is obtained and transferred from the intermediate frequency output of The processor unit 40 detects an IF signal that is in accordance with the expected value, it is assumed that the Doppler transceiver 30 is operating properly. In the same case as that described with regard to the state of the art in FIG. 1, with a disconnection on point 34 of the antenna, there will also be no difference in frequency detected by the unit of the antenna. treatment 40 under the movement of a target. But, unlike the state of the art, an antenna failure can be determined, due to the fact that the modulation parameters are applied by the reflection modulator 44, by the processing unit 40. An antenna failure, when the monitoring signal is applied, the IF signal obtained does not conform to the expected IF signal.
    FIG. 3 represents a further principle of the invention where the Doppler transceiver 50 comprises a dual antenna system 54, 66. In the present embodiment, the monitoring circuit operates differently from the embodiment illustrated in FIG. 2. In this case, as shown in FIG. 3, the Doppler transceiver 50 comprises an oscillator 52 which is connected to an emitter antenna 54. The oscillator 52 generates a signal comprising a frequency F0 which is transmitted to the detection field. The oscillator 52 also provides the mixer 64 with a local oscillator signal via a coupling structure 56. The transmitted signal is partially sent via a coupling unit 58, which is linked to a modulation unit 60. The sent signal is modulated according to defined modulation parameters. In the additional method, the modulated signal is transferred to a coupling unit 62. The modulated signal is sent by the coupling unit 62 and retransmitted to the receiving antenna 66. As is known from the above-mentioned example the modulated signal is transferred to a mixer 64 which generates the difference frequency, as described with respect to Fig. 2. The signal obtained is then transferred to the processing unit 68. The processing unit 68 knows the modulation parameters applied by the modulation unit 60, and is able to compare the signal parameters to the modulation parameters and finally to determine whether there is a transceiver failure or not.
    Figure 4 shows a first embodiment of a single antenna transceiver and its monitoring circuit. For clarity, only the antenna as well as the. monitoring circuit are shown in this figure 4.
    In the present example, the monitored transceiver comprises an antenna 74 with a feed point 76 where the transceiver electronics will be connected. The antenna 74 is in the form of an antenna array with microstrip elements. In the vicinity of the antenna, a wireless coupling structure is applied on the same surface as the antenna. In the case of the single antenna device, the coupling structure 78 is constructed as a coupling line connected to a single microwave PIN diode 80. The PIN diode 80 is stimulated by the modulator 84. The PIN diode 80 is in the form of a switching diode, which changes its reflection coefficient according to the modulation signal applied by the modulator 84. The sent signal is reflected modulated by the diode and returned to the antenna 74. Once the signal is received by the antenna 74, it is processed as described with respect to Figure 2.
    Due to these microstrip structures, the processing costs are very low. The antenna consists of three connected elements, which are applied to the surface. The length of the coupling line is related to the emitted wavelength. Therefore, it may be necessary to adjust the position of the diode on the coupling line to achieve proper transmission between the antenna and the coupling line.
    The location of the coupling line in the vicinity of the antenna 74 ensures proper operation of the microwave controls, triggered by the processing unit.
    FIG. 5 shows a two-antenna transceiver comprising two microstrip antenna arrays 90, 96. There is a first antenna array 90 for transmitting the signal and a second antenna array 96 for receive the signal that is reflected by an object moving within the detection field of the transceiver.
    In addition, the device comprises a coupling line 94 which is arranged in the vicinity of the transmitting antenna 90. The dimension of the coupling line 94 is related to the transmitted wavelength of the transceiver and allows wirelessly send the transmitted signal. The signal is then transferred to a modulation unit comprising a PIN diode 100, which is embodied as a transmission modulator. The modulation unit further comprises a modulator 92 which applies a stimulation signal to the PIN diode 100. Linked to the stimulation signal, the sent signal is modulated accordingly and passes through the PIN diode 100 in a modulated manner. Once the modulated signal, whose amplitude and phase can be modulated, passes through the modulation unit, it then reaches an additional wireless coupling structure realized as a coupling line 98, where the signal is returned. at the receiving antenna 96.
    Once the signal is received, the signal will be processed as explained with respect to Fig. 3. In this case, the modulator is embodied as a transmission modulating unit that uses a transmission change, an attenuation. or a phase of the diode that is switched by a modulation signal. A transmission transistor is also possible to modulate the signal as the aforementioned diode.
    FIG. 6 shows another embodiment of a single antenna transceiver and its monitoring circuit compared to that illustrated in FIG. 4. According to the present example, the coupling structure 114 consists of an electrical connection with wire directly connected to the antenna 110. The modulation unit 112 is thus coupled to the wire antenna. The operating principle described with respect to Figure 2 for a wireless embodiment is also fully valid for a wired embodiment of the invention. Unlike wireless coupling, wire coupling causes low frequencies and RF.
    Thanks to the invention, a periodic or permanent control of a Doppler transceiver can be realized to check the detection performance and to ensure that the performances are maintained. The integrity of the complete sensor can be monitored continuously, very inexpensively to ensure proper operation.
    List of reference signs 10 Doppler transceiver 12 oscillator 14 antenna 16 antenna feed point 17 mixer coupling structure 18 mixer unit 20 object 22 transmission line 30 Doppler transceiver 32 Doppler 30 transceiver oscillator 34 antenna feed point 36 mixer coupling point 38 mixer structure 40 processing unit 42 coupling unit 44 reflection modulator 46 antenna 48 modulation unit 50 Doppler transceiver 52 oscillator 54 transmitting antenna 56 coupling point local mixer-oscillator 58 coupling unit 60 modulation unit 62 coupling unit 64 mixer unit 66 receiving antenna 68 processing unit 70 modulation unit 74 microstrip element array 76 feed point 78 coupling line 80 PIN diode microwave 82 mass 84 modulator 86 modulation unit 90 transmitting antenna with microstrip element array 94 coupling line 96 receiving antenna 98 coupling line 100 diode microwave PIN 102 transmitter supply point 104 receiver power point 106 modulation unit - coupling line 110 microstrip element network 112 modulation 114 line coupling with wire
    权利要求:
    Claims (15)
    [1]
    A method for monitoring the integrity of a Doppler transceiver (30, 50), wherein a Doppler transceiver (30, 50) comprises a transmitter unit, a receiver unit and at least one mixer unit (38, 64), wherein a signal is transmitted from the transmitter (46, 54, 74, 90, 110), characterized in that the transmitted signal is at least partially transmitted in a modulation unit (48, 106). , 112), where the signal is modulated according to certain parameters, and the modulated signal is retransmitted to the receiver unit (64, 66, 90, 96, 110).
    [2]
    2. The method according to claim 1, characterized in that the modulation unit (48, 106, 112) outputs a modulated signal to at least one transmitting / receiving antenna (30).
    [3]
    3. The method according to claim 1, characterized in that the modulation unit (70, 106) transmits a signal received from at least one transmitting antenna, the module and sends it back to at least one separate receiving antenna. .
    [4]
    Method according to one of the preceding claims, characterized in that the transmitted signal is fed into the modulation unit (48, 70, 86, 106) via a coupling unit (42, 58, 78). , 94).
    [5]
    5. Method according to any one of the preceding claims, characterized in that the modulated signal is sent into the receiver unit via a coupling unit (42, 58, 62, 98).
    [6]
    6. Method according to any one of the preceding claims, characterized in that the received modulated signal is mixed with the transmitted signal to obtain a demodulated IF signal.
    [7]
    7. Process according to claim 6, characterized in that the IF signal is compared to values expected by a processing unit.
    [8]
    8. Method according to any one of the preceding claims, characterized in that the modulation parameters cause a phase shift and / or amplitude and / or frequency.
    [9]
    9. Doppler transceiver, comprising an emitter unit and a receiver unit having at least one antenna (34, 54, 66, 74, 90, 96) and a mixer unit (38, 64), characterized in that it also includes a modulation unit (48, 70, 86, 106) which is coupled to the antenna (s) (34, 54, 66, 74, 90, 96).
    [10]
    10. - Doppler transceiver according to claim 9, characterized in that the modulation unit (38, 64) is coupled to the wireless antenna (34, 54, 66, 74, 90, 96).
    [11]
    11. Doppler transceiver according to claim 9 or 10, characterized in that a transmitter unit and a receiver unit are combined in a single antenna (34, 74) or use a single antenna (34, 74). .
    [12]
    12. - Doppler transceiver according to claim 9 to 11, characterized in that it comprises at least one transmitting antenna (66, 90) and at least one receiving antenna (66, 96) separated from the transmitting antenna (66). , 90) at RF frequencies.
    [13]
    13. - Doppler transceiver according to claims 9 to 12, characterized in that it is a microwave sensor and / or a radar sensor.
    [14]
    14. - Doppler transceiver according to claims 9 to 13, characterized in that the modulation unit (48, 70, 86, 106) is arranged in the vicinity of the antenna (34, 54, 66, 74, 90, 96).
    [15]
    15. - Doppler transceiver according to any one of claims 9 to 14, characterized in that the modulation unit (48, 70, 86, 106) and the antenna (34, 54, 66, 74, 90, 96 ) are built on the same substrate.
    类似技术:
    公开号 | 公开日 | 专利标题
    BE1019955A3|2013-03-05|MONITORING SYSTEM FOR A DOPPLER TRANSCEIVER
    EP0170557B1|1990-08-22|Frequency-modulated radio-altimeter
    FR2865041A1|2005-07-15|INTEGRATED CIRCUIT FOR MEASURING DISTANCE AND / OR SPEED OF OBJECTS
    EP3156810A1|2017-04-19|Measurement of shielding attenuation
    FR2868543A1|2005-10-07|HYPERFREQUENCY SENSOR
    EP0429568B1|1995-03-22|Identification system using hertzian waves, consisting of an interrogation station and a responder unit
    FR2802038A1|2001-06-08|HYBRID LASER AND MICROWAVE COMMUNICATION METHODS AND SYSTEMS
    EP2472215B1|2013-08-28|Method and device for the neutralisation of a target
    EP2389782A1|2011-11-30|Self-contained antenna device with quick aiming switching
    FR3077944A1|2019-08-16|METHOD FOR DETECTING PORTABLE USER EQUIPMENT IN A PREDETERMINED AREA, IN OR OUTSIDE A VEHICLE BY ULTRA HIGH FREQUENCY, DETECTION DEVICE AND USER EQUIPMENT THEREFOR
    EP3495986B1|2021-05-05|Nfc device detection
    FR2519771A1|1983-07-18|Pulse compression LIDAR system - uses Doppler effect in reflected laser light to track moving target
    FR2965633A1|2012-04-06|Method for measuring displacement of electromagnetic reflector with respect to measuring antenna e.g. emitting antenna, involves carrying out fin scanning for phase of difference signal for estimating phase of signal
    EP2341363B1|2013-09-11|System for responding to a signal emitted by a radar and use of said system mainly for testing radars, in particular MTI radars
    EP1152258B1|2007-09-12|Low-cost radar, in particular for high-resolution imaging
    EP2359646B1|2016-03-16|Communication device and method, and system including such a device
    US10928273B2|2021-02-23|Method and apparatus for detecting discontinuities in an optical channel, in particular a fiber optic line
    EP0504275B1|1995-08-02|Process and device for transmitting video signals in a confined medium
    FR2483085A3|1981-11-27|Active detector for short range radar - uses negative resistance diode oscillator converting echoes to IF signals
    JP2004177340A|2004-06-24|Short distance sensor
    EP0429349A1|1991-05-29|Method and device for transmission of broadband signals with a mobile equipment
    FR2965634A1|2012-04-06|System for measuring distance between measuring antenna and electromagnetic reflector, has calculating unit that calculates distance from temporal positions corresponding to reflection of emitted wave on antenna
    FR2965635A1|2012-04-06|System for measuring distance between antenna and electromagnetic reflector, has calculating unit determining temporal positions of peak of signal, where calculating unit determines distance from temporal positions
    WO2018087095A1|2018-05-17|Method for transmitting a signal by a transmitter device to a non-geosynchronous satellite
    FR2690585A1|1993-10-29|Digitally modulated laser beam for bidirectional communication between satellites - has laser transmitter-receiver with digital modulation and second beacon aligning laser beam
    同族专利:
    公开号 | 公开日
    EP2418505A1|2012-02-15|
    US20120021698A1|2012-01-26|
    US8886134B2|2014-11-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2256926A1|1972-11-21|1974-05-30|Schomandl Kg|ROOM MONITORING DEVICE|
    US3947834A|1974-04-30|1976-03-30|E-Systems, Inc.|Doppler perimeter intrusion alarm system using a leaky waveguide|
    EP0825455A2|1996-08-16|1998-02-25|Fujitsu Limited|Failure determination device of radar apparatus|
    EP0916929A1|1997-11-07|1999-05-19|New Holland Belgium N.V.|Antenna unit for the doppler measurement of grain flow|
    DE102005046044A1|2005-09-27|2007-03-29|Robert Bosch Gmbh|Radar sensor comprises primary and secondary circuit sections located on a chip, with oscillators, mixers, and an aerial for sending and receiving|
    DE68920873T2|1989-07-31|1995-08-31|Ber Sa|Electronic automatic monitoring system.|
    SE0101174L|2001-04-02|2002-02-19|Saab Ab|Method and signal transmitters for noise modulated remote measurement and group antenna systems including signal transmitters|
    US6633254B1|2002-08-15|2003-10-14|Bae Systems Information And Electronics Systems Integration Inc.|Self-modulating remote moving target detector|
    US7057550B1|2005-02-16|2006-06-06|Applied Concepts, Inc.|System and method for calibrating a vehicular traffic surveillance Doppler radar|US9375153B2|2010-05-17|2016-06-28|Industrial Technology Research Institute|Motion/vibration sensor|
    US9603555B2|2010-05-17|2017-03-28|Industrial Technology Research Institute|Motion/vibration detection system and method with self-injection locking|
    CN106093519A|2016-06-03|2016-11-09|厦门市星云睿自动化科技有限公司|Electroplating current based on ZigBee monitoring system|
    US10768308B2|2017-02-20|2020-09-08|Iposi, Inc.|Receiver integrity monitoring using doppler analysis|
    DE102018209233A1|2018-06-11|2019-12-12|Siemens Aktiengesellschaft|Device and method for detecting a drift and / or a change in position of radar systems|
    US10922940B1|2018-12-05|2021-02-16|Amazon Technologies, Inc.|Battery-powered radio frequency motion detector|
    US11129042B2|2019-09-16|2021-09-21|Nec Corporation Of America|Path crossing detection based on wireless signals travel time|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    EP10170828|2010-07-26|
    EP10170828A|EP2418505A1|2010-07-26|2010-07-26|Modulating backscatter reflector for testing a Doppler transceiver|
    [返回顶部]