CN103235293A - Method and device for frequency correction - Google Patents
Method and device for frequency correction Download PDFInfo
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- CN103235293A CN103235293A CN2013100972738A CN201310097273A CN103235293A CN 103235293 A CN103235293 A CN 103235293A CN 2013100972738 A CN2013100972738 A CN 2013100972738A CN 201310097273 A CN201310097273 A CN 201310097273A CN 103235293 A CN103235293 A CN 103235293A
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Abstract
An embodiment of the invention discloses a method and a device for frequency correction. The method includes sending reference signals to a radar sensor, and receiving oscillator signals of the radar sensor returned from the same and difference frequency signals of the reference signals; performing the frequency correction on the oscillator signals of the radar sensor by adopting the oscillator signals of the radar sensor and the difference frequency signals of the reference signals; and controlling the oscillator signals adjusted and output by the radar sensor. By the method, linearity degrees of the oscillator signals sent by a VCO (voltage-controlled oscillator) of the radar sensor can be increased, and measurement accuracy of the radar sensor can be improved.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of method and device of frequency correction.
Background technology
Along with electronic technology constantly develops, radar sensor has extensively been applied to the measurement to target velocity and distance, for example: the speed of a motor vehicle to vehicle on the highway is surveyed, the object liquid level is measured etc., the inner integrated VCO(Voltage-Controlled Oscillator of radar sensor, voltage controlled oscillator), microwave device such as circulator, frequency mixer, its Highgrade integration makes the user only need provide power supply and modulation signal, has improved the convenience that radar sensor uses.
Reason owing to radar sensor self design, make that the linearity of the oscillator signal that built-in VCO sends is relatively poor, so that when carrying out range observation, its measuring accuracy is difficult to reach higher standard, again because its VCO parts all are integrated in radar sensor inside, thereby the mode by direct modification VCO of being difficult to improves the linearity of the oscillator signal that VCO sends.
Summary of the invention
The embodiment of the invention provides a kind of method and device of frequency correction, can improve the linearity of the oscillator signal that VCO sends in the radar sensor, promotes the measuring accuracy of radar sensor.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of method of frequency correction, comprising:
Send reference signal to radar sensor, and receive described radar sensor and return the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
Adopt the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, the oscillator signal of described radar sensor is carried out frequency correction;
Control the oscillator signal after described radar sensor output is adjusted.
Correspondingly, the embodiment of the invention also provides a kind of device of frequency correction, comprising:
The signal transmitting and receiving module is used for sending reference signal to radar sensor, and receives described radar sensor and return the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
Frequency correction module be used for to adopt the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, and the oscillator signal of described radar sensor is carried out frequency correction;
The control output module is used for the oscillator signal after the described radar sensor output of control is adjusted.
Implement the embodiment of the invention, have following beneficial effect:
By sending reference signal to radar sensor, and the oscillator signal of the radar sensor that returns according to the receiving radar sensor and the difference frequency signal of described reference signal, proofread and correct the oscillator signal that radar sensor sends, improve the linearity of the oscillator signal that VCO sends in the radar sensor, promoted the measuring accuracy of radar sensor.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the method for a kind of frequency correction of providing of the embodiment of the invention;
Fig. 2 is the schematic flow sheet of the method for the another kind of frequency correction that provides of the embodiment of the invention;
Fig. 3 is the structural representation of the device of a kind of frequency correction of providing of the embodiment of the invention;
Fig. 4 is the structural representation of the signal transmitting and receiving module that provides of the embodiment of the invention;
Fig. 5 is the structural representation of the frequency correction module that provides of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In embodiments of the present invention, described radar sensor is in the linearity correction of carrying out oscillator signal, also can launch oscillator signal to target object, therefore the signal that is input in the frequency mixer of described radar sensor can comprise described oscillator signal and the echoed signal that reflects according to described oscillator signal with described target object, described oscillator signal is the signal that comprises characteristic frequency that the VCO in the described radar sensor sends, and described radar sensor can be planar microstrip antenna radar sensor.
See also Fig. 1, a kind of schematic flow sheet of method of frequency correction is provided for the embodiment of the invention.As shown in Figure 1, said method comprising the steps of of the embodiment of the invention:
S101 sends reference signal to radar sensor, and receives described radar sensor and return the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
Concrete, described reference signal can be for comprising the signal of a predeterminated frequency, frequency correcting apparatus is to the frequency mixer transmitted reference signal of described radar sensor, at this moment, the signal that is input in the frequency mixer of described radar sensor comprises: described oscillator signal, described echoed signal and described reference signal, described radar sensor is poor in twos with the frequency of these three kinds of signals, and with the frequency of these three kinds of signals do in twos and, therefore the set of signals of exporting from the frequency mixer of described radar sensor comprises: the difference frequency signal of the oscillator signal of described radar sensor and the echoed signal of described radar sensor, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, the echoed signal of described radar sensor and the difference frequency signal of described reference signal, and the echoed signal of the oscillator signal of described radar sensor and described radar sensor with the frequency signal, the oscillator signal of described radar sensor and described reference signal with the frequency signal, the echoed signal of described radar sensor and described reference signal with the frequency signal, because the setting of radar sensor inside, above-mentioned three kinds and signal can be automatically by described radar sensor filtering frequently.Described frequency correcting apparatus can comprise bandpass filter, described set of signals is carried out filtering handle, and obtains the oscillator signal of described radar sensor and the difference frequency signal of described reference signal.
Wherein, the difference frequency signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor is the corresponding signal of difference of the frequency of the frequency of described oscillator signal and described echoed signal;
The oscillator signal of described radar sensor and the difference frequency signal of described reference signal are the corresponding signal of difference of the frequency of the frequency of described oscillator signal and described reference signal;
The echoed signal of described radar sensor and the difference frequency signal of described reference signal are the corresponding signal of difference of the frequency of the frequency of described echoed signal and described reference signal.
S102 adopts the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, and the oscillator signal of described radar sensor is carried out frequency correction;
Concrete, described frequency correcting apparatus can comprise phase-locked loop circuit, wherein, VCO in the described phase-locked loop circuit has been integrated in the described radar sensor, the oscillator signal of the described radar sensor that described frequency correcting apparatus will obtain and the difference frequency signal of described reference signal, be input to and carry out frequency correction in the described phase-locked loop circuit, trimming process comprises:
1, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal are carried out N value frequency division, described N value can be passed through MCU(Micro Control Unit, micro-control unit) set;
2, the oscillator signal of the described radar sensor behind the described frequency division and the difference frequency signal of described reference signal and the reference signal in the described frequency correcting apparatus are carried out phase demodulation, whether the frequency that detects difference frequency signal behind this frequency division and reference signal is consistent with phase place;
If the difference frequency signal behind the 3 described frequency divisions and frequency and the phase place of described reference signal are inconsistent, then continue to adjust the DC voltage that is input to described radar sensor, control the frequency that described radar sensor is adjusted the oscillator signal of VCO output by changing DC voltage, then re-execute trimming process again, the difference frequency signal behind described frequency division is consistent with the phase place of described reference signal and frequency;
If the difference frequency signal behind the 4 described frequency divisions and the frequency of described reference signal are consistent with phase place, the frequency that is the difference frequency signal of the oscillator signal of described radar sensor and described reference signal be described reference signal frequency N doubly, the DC voltage that then keeps being input to described radar sensor is invariable.
S103 controls the oscillator signal after described radar sensor output is adjusted;
Concrete, the VCO that described frequency correcting apparatus is controlled in the described radar sensor according to the invariable DC voltage of adjusting output launches oscillator signal.
In embodiments of the present invention, frequency correcting apparatus is by sending reference signal to radar sensor, and the oscillator signal of the radar sensor that returns according to the receiving radar sensor and the difference frequency signal of described reference signal, proofread and correct the oscillator signal that radar sensor sends, improve the linearity of the oscillator signal that VCO sends in the radar sensor, thereby promoted the measuring accuracy of radar sensor.
See also Fig. 2, the schematic flow sheet of the method for another kind of frequency correction is provided for the embodiment of the invention.As shown in Figure 2, said method comprising the steps of of the embodiment of the invention:
S201, send reference signal to radar sensor, receive the set of signals that described radar sensor returns, described set of signals comprises difference frequency signal, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor, and the difference frequency signal of the echoed signal of described radar sensor and described reference signal;
Concrete, described reference signal can be for comprising the signal of a predeterminated frequency, frequency correcting apparatus is to the frequency mixer transmitted reference signal of described radar sensor, at this moment, the signal that is input in the frequency mixer of described radar sensor comprises: described oscillator signal, described echoed signal and described reference signal, described radar sensor is poor in twos with the frequency of these three kinds of signals, and with the frequency of these three kinds of signals do in twos and, therefore the set of signals of exporting from the frequency mixer of described radar sensor comprises: the difference frequency signal of the oscillator signal of described radar sensor and the echoed signal of described radar sensor, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, the echoed signal of described radar sensor and the difference frequency signal of described reference signal, and the echoed signal of the oscillator signal of described radar sensor and described radar sensor with the frequency signal, the oscillator signal of described radar sensor and described reference signal with the frequency signal, the echoed signal of described radar sensor and described reference signal with the frequency signal, because the setting of radar sensor inside, above-mentioned three kinds and signal can be automatically by described radar sensor filtering frequently.Described frequency correcting apparatus receives the described set of signals that described radar sensor returns.
Wherein, the difference frequency signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor is the corresponding signal of difference of the frequency of the frequency of described oscillator signal and described echoed signal;
The oscillator signal of described radar sensor and the difference frequency signal of described reference signal are the corresponding signal of difference of the frequency of the frequency of described oscillator signal and described reference signal;
The echoed signal of described radar sensor and the difference frequency signal of described reference signal are the corresponding signal of difference of the frequency of the frequency of described echoed signal and described reference signal.
S202 carries out filtering to described set of signals and handles, and obtains the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
Concrete, described frequency correcting apparatus can comprise bandpass filter, described set of signals is carried out filtering handle, and obtains the oscillator signal of described radar sensor and the difference frequency signal of described reference signal.
S203 carries out frequency division to the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, and the difference frequency signal behind the described frequency division and reference signal is carried out phase demodulation;
Concrete, described frequency correcting apparatus carries out N value frequency division to the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, described N value can be set by MCU, the oscillator signal of the described radar sensor of described frequency correcting apparatus after to described frequency division and the difference frequency signal of described reference signal and the reference signal in the described frequency correcting apparatus are carried out phase demodulation, and whether the frequency that detects difference frequency signal behind this frequency division and reference signal is consistent with phase place.
S204 controls the frequency that described radar sensor is adjusted oscillator signal according to the result behind the phase demodulation;
Concrete, if the difference frequency signal behind the described frequency division and the phase place of described reference signal and frequency are inconsistent, then described frequency correcting apparatus adjustment is input to the DC voltage of described radar sensor, adjust the frequency of oscillator signal to control described radar sensor, the difference frequency signal behind described frequency division is consistent with the phase place of described reference signal and frequency;
If the difference frequency signal behind the described frequency division is consistent with the phase place of described reference signal and frequency, then described frequency correcting apparatus keeps the described DC voltage that is input to described radar sensor constant.
S205 adopts the described radar sensor outputting oscillation signal of described constant DC pressure-controlled;
Concrete, the VCO that described frequency correcting apparatus is controlled in the described radar sensor according to the invariable DC voltage of adjusting output launches oscillator signal.
In embodiments of the present invention, frequency correcting apparatus is by sending reference signal to radar sensor, and the oscillator signal of the radar sensor that returns according to the receiving radar sensor and the difference frequency signal of described reference signal, proofread and correct the oscillator signal that radar sensor sends, improve the linearity of the oscillator signal that VCO sends in the radar sensor, thereby promoted the measuring accuracy of radar sensor.
See also Fig. 3, a kind of structural representation of device of frequency correction is provided for the embodiment of the invention.As shown in Figure 3, the described device 1 in the embodiment of the invention comprises:
Signal transmitting and receiving module 11 is used for sending reference signal to radar sensor, and receives described radar sensor and return the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
In the specific implementation, described signal transmitting and receiving module 11 is to the frequency mixer transmitted reference signal of described radar sensor, and receive the set of signals that described radar sensor returns, 11 pairs of described set of signals of described signal transmitting and receiving module are carried out the filtering processing, obtain the oscillator signal of described radar sensor and the difference frequency signal of described reference signal.
Concrete, please in the lump referring to Fig. 4, provide the structural representation of signal transmitting and receiving module for the embodiment of the invention.As shown in Figure 4, described signal transmitting and receiving module 11 comprises:
Signal transmitting and receiving unit 111, be used for sending reference signal to radar sensor, receive the set of signals that described radar sensor returns, described set of signals comprises difference frequency signal, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor, and the difference frequency signal of the echoed signal of described radar sensor and described reference signal;
In the specific implementation, described reference signal can be for comprising the signal of a predeterminated frequency, described signal transmitting and receiving unit 111 is to the frequency mixer transmitted reference signal of described radar sensor, at this moment, the signal that is input in the frequency mixer of described radar sensor comprises: described oscillator signal, described echoed signal and described reference signal, described radar sensor is poor in twos with the frequency of these three kinds of signals, and with the frequency of these three kinds of signals do in twos and, therefore the set of signals of exporting from the frequency mixer of described radar sensor comprises: the difference frequency signal of the oscillator signal of described radar sensor and the echoed signal of described radar sensor, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, the echoed signal of described radar sensor and the difference frequency signal of described reference signal, and the echoed signal of the oscillator signal of described radar sensor and described radar sensor with the frequency signal, the oscillator signal of described radar sensor and described reference signal with the frequency signal, the echoed signal of described radar sensor and described reference signal with the frequency signal, because the setting of radar sensor inside, above-mentioned three kinds and signal can be automatically by described radar sensor filtering frequently.Described signal transmitting and receiving unit 111 receives the described set of signals that described radar sensor returns.
Wherein, the difference frequency signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor is the corresponding signal of difference of the frequency of the frequency of described oscillator signal and described echoed signal;
The oscillator signal of described radar sensor and the difference frequency signal of described reference signal are the corresponding signal of difference of the frequency of the frequency of described oscillator signal and described reference signal;
The echoed signal of described radar sensor and the difference frequency signal of described reference signal are the corresponding signal of difference of the frequency of the frequency of described echoed signal and described reference signal.
In the specific implementation, described signal filtering unit 112 can comprise bandpass filter, described set of signals is carried out filtering handle, and obtains the oscillator signal of described radar sensor and the difference frequency signal of described reference signal.
In the specific implementation, described frequency correction module 12 can comprise phase-locked loop circuit, wherein, VCO in the described phase-locked loop circuit has been integrated in the described radar sensor, the oscillator signal of the described radar sensor that described frequency correction module 12 will obtain and the difference frequency signal of described reference signal are input to and carry out frequency correction in the described phase-locked loop circuit.
Concrete, please in the lump referring to Fig. 5, provide the structural representation of frequency correction module for the embodiment of the invention.As shown in Figure 5, described frequency correction module 12 comprises:
Signal phase demodulation unit 121 is used for the oscillator signal of described radar sensor and the difference frequency signal of described reference signal are carried out frequency division, and the difference frequency signal behind the frequency division and reference signal is carried out phase demodulation;
In the specific implementation, the oscillator signal of the 121 pairs of described radar sensors in described signal phase demodulation unit and the difference frequency signal of described reference signal carry out N value frequency division, described N value can be set by MCU, the oscillator signal of the described radar sensor behind the 121 pairs of described frequency divisions in described signal phase demodulation unit and the difference frequency signal of described reference signal and the reference signal in the described frequency correcting apparatus are carried out phase demodulation, and whether the frequency that detects difference frequency signal behind this frequency division and reference signal is consistent with phase place.
In the specific implementation, described frequency adjustment unit 122 is controlled the frequency that described radar sensor is adjusted oscillator signal according to the result that described signal phase demodulation unit 121 detects.
Concrete, described frequency adjustment unit 122 can comprise:
First adjusts subelement, if phase place and frequency for the difference frequency signal behind the described frequency division and described reference signal are inconsistent, then adjust the DC voltage that is input to described radar sensor, adjust the frequency of oscillator signal to control described radar sensor, the difference frequency signal behind described frequency division is consistent with the phase place of described reference signal and frequency;
In the specific implementation, if it is inconsistent that described signal phase demodulation unit 121 detects frequency and the phase place of difference frequency signal behind the described frequency division and described reference signal, then described first adjust the lasting DC voltage that is input to described radar sensor of adjusting of subelement, control the frequency that described radar sensor is adjusted the oscillator signal of VCO output by changing DC voltage, then re-execute trimming process again, the difference frequency signal behind described frequency division is consistent with the phase place of described reference signal and frequency.
Second adjusts subelement, if the difference frequency signal that is used for behind the described frequency division is consistent with phase place and the frequency of described reference signal, then keeps the described DC voltage that is input to described radar sensor constant;
In the specific implementation, if it is consistent with phase place that described signal phase demodulation unit 121 detects the frequency of difference frequency signal behind the described frequency division and described reference signal, the frequency that is the difference frequency signal of the oscillator signal of described radar sensor and described reference signal be described reference signal frequency N doubly, then described second adjust subelement to keep being input to the DC voltage of described radar sensor invariable.
Control output module 13 is used for the oscillator signal after the described radar sensor output of control is adjusted;
In the specific implementation, the VCO that described control output module 13 is controlled in the described radar sensor according to the invariable DC voltage of the adjustment of second in the described frequency adjustment unit 122 subelement adjustment output launches oscillator signal.
In embodiments of the present invention, frequency correcting apparatus is by sending reference signal to radar sensor, and the oscillator signal of the radar sensor that returns according to the receiving radar sensor and the difference frequency signal of described reference signal, proofread and correct the oscillator signal that radar sensor sends, improve the linearity of the oscillator signal that VCO sends in the radar sensor, thereby promoted the measuring accuracy of radar sensor.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosed is preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. the method for a frequency correction is characterized in that, comprising:
Send reference signal to radar sensor, and receive described radar sensor and return the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
Adopt the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, the oscillator signal of described radar sensor is carried out frequency correction;
Control the oscillator signal after described radar sensor output is adjusted.
2. method according to claim 1 is characterized in that, the described radar sensor of described reception returns the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, comprising:
Receive the set of signals that described radar sensor returns, described set of signals comprises difference frequency signal, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor, and the difference frequency signal of the echoed signal of described radar sensor and described reference signal;
Described set of signals is carried out filtering handle, obtain the oscillator signal of described radar sensor and the difference frequency signal of described reference signal.
3. method according to claim 1 and 2 is characterized in that, the oscillator signal of the described radar sensor of described employing and the difference frequency signal of described reference signal carry out frequency correction to the oscillator signal of described radar sensor, comprising:
The oscillator signal of described radar sensor and the difference frequency signal of described reference signal are carried out frequency division, and the difference frequency signal behind the described frequency division and reference signal are carried out phase demodulation;
Control the frequency that described radar sensor is adjusted oscillator signal according to the result behind the phase demodulation.
4. method according to claim 3 is characterized in that, the described frequency of controlling described radar sensor adjustment oscillator signal according to the result behind the phase demodulation comprises:
If the difference frequency signal behind the described frequency division and the phase place of described reference signal and frequency are inconsistent, then adjust the DC voltage that is input to described radar sensor, adjust the frequency of oscillator signal to control described radar sensor, the difference frequency signal behind described frequency division is consistent with the phase place of described reference signal and frequency;
If the difference frequency signal behind the described frequency division is consistent with the phase place of described reference signal and frequency, then keep the described DC voltage that is input to described radar sensor constant.
5. method according to claim 4 is characterized in that, the oscillator signal after the described radar sensor output of described control is adjusted comprises:
Adopt the described radar sensor outputting oscillation signal of described constant DC pressure-controlled.
6. the device of a frequency correction is characterized in that, comprising:
The signal transmitting and receiving module is used for sending reference signal to radar sensor, and receives described radar sensor and return the oscillator signal of described radar sensor and the difference frequency signal of described reference signal;
Frequency correction module be used for to adopt the oscillator signal of described radar sensor and the difference frequency signal of described reference signal, and the oscillator signal of described radar sensor is carried out frequency correction;
The control output module is used for the oscillator signal after the described radar sensor output of control is adjusted.
7. device according to claim 6 is characterized in that, described signal transmitting and receiving module comprises:
The signal transmitting and receiving unit, be used for sending reference signal to radar sensor, receive the set of signals that described radar sensor returns, described set of signals comprises difference frequency signal, the oscillator signal of described radar sensor and the difference frequency signal of described reference signal of the echoed signal of the oscillator signal of described radar sensor and described radar sensor, and the difference frequency signal of the echoed signal of described radar sensor and described reference signal;
The signal filtering unit is used for that described set of signals is carried out filtering and handles, and obtains the oscillator signal of described radar sensor and the difference frequency signal of described reference signal.
8. according to claim 6 or 7 described devices, it is characterized in that described frequency correction module comprises:
Signal phase demodulation unit is used for the oscillator signal of described radar sensor and the difference frequency signal of described reference signal are carried out frequency division, and the difference frequency signal behind the frequency division and reference signal is carried out phase demodulation;
The frequency adjustment unit is used for controlling the frequency that described radar sensor is adjusted oscillator signal according to the result behind the phase demodulation.
9. device according to claim 8 is characterized in that, described frequency adjustment unit comprises:
First adjusts subelement, if phase place and frequency for the difference frequency signal behind the described frequency division and described reference signal are inconsistent, then adjust the DC voltage that is input to described radar sensor, adjust the frequency of oscillator signal to control described radar sensor, the difference frequency signal behind described frequency division is consistent with the phase place of described reference signal and frequency;
Second adjusts subelement, if the difference frequency signal that is used for behind the described frequency division is consistent with phase place and the frequency of described reference signal, then keeps the described DC voltage that is input to described radar sensor constant.
10. device according to claim 9 is characterized in that, described control output module specifically is used for adopting the described radar sensor outputting oscillation signal of described constant DC pressure-controlled.
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Application publication date: 20130807 |