CN2733379Y - A car reversing radar - Google Patents
A car reversing radar Download PDFInfo
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- CN2733379Y CN2733379Y CN 200420088316 CN200420088316U CN2733379Y CN 2733379 Y CN2733379 Y CN 2733379Y CN 200420088316 CN200420088316 CN 200420088316 CN 200420088316 U CN200420088316 U CN 200420088316U CN 2733379 Y CN2733379 Y CN 2733379Y
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Abstract
The utility model discloses a car reversing radar, which comprises ultrasonic sending and receiving device (1), a front end processing circuit (2), and a signal amplifier (3). An alarm device (5) can receive output signals of a central processing unit (4) and displays or alarms timely. The device also comprises a frequency phase locked loop circuit (6) which adjusts automatically, produces output signals with same frequency with the frequency of the input signal received by the signal amplifier and outputs the output signals to the central processing unit again according to the frequency phase difference between the input signal of the signal amplifier and the reference signal. The frequency phase locked loop circuit comprises a phase discriminator (61), a loop filter (63) and a voltage-controlling oscillator (62). The utility model can accurately capture the returning wave when the frequency of the returning wave drifts, which ensures the central processing unit to obtain the analytical data source which can timely and correct reflect the distance of the barrier around the car and provide guarantee for users to judge the direction and the distance of the barrier correctly.
Description
Technical field
The utility model relates to a kind of reversing radar of vehicle technology that is used to survey the Azimuth ﹠ Range of vehicle body peripheral obstacle.
Background technology
Reversing radar of vehicle now has been widely used in the automobile as a kind of vehicle electronics, is mainly used in the Azimuth ﹠ Range of surveying the vehicle body peripheral obstacle, for the driver of vehicle provides reference.The principle of work of existing reversing radar of vehicle generally is to launch the ultrasound wave of a characteristic frequency around vehicle body by ultrasonic transmitter, receive the close echo signal that barrier reflects by ultrasonic receiver, directly transfer to central processing unit after by the close echo signal amplifier this signal being amplified again and carry out in good time Treatment Analysis, and result exported to warning device or/and display device, reach with this and whether exist the particular location of barrier and this barrier and vehicle body to concern this purpose around realizing surveying vehicle body.
Because ultrasound wave is when running into barrier, though can reflect to form close echo in good time, but, ultrasound wave after reflection can be owing to be subjected to the character of barrier self, influence with factors such as the distance of vehicle body and surrounding environment, tend to take place frequency drift phenomenon in various degree, when the drift frames of frequency is spent greatly, will make the signal of close echo signal amplifier output be difficult to be accepted smoothly or correctly by central processing unit and handle, like this, radar for backing car may be difficult to detect barrier or the information that detects inaccurate, especially when the obstacle distance vehicle body is far away (generally greater than 2.0 meters time), this phenomenon can be more obvious, therefore is necessary existing this radar for backing car technology is improved.
Summary of the invention
Technical problem to be solved in the utility model is intended to provide a kind of reversing radar of vehicle that can survey vehicle body barrier Azimuth ﹠ Range on every side more exactly.
According to the utility model, a kind of reversing radar of vehicle, comprise ultrasonic emitting and the receiver launching the ultrasonic ranging signal and receive the close echo signal, and be docile and obedient preface front-end processing circuit of joining and the signal amplifier that amplifies the close echo signal with described ultrasonic emitting and receiver; Warning device can receive the output signal of central processing unit and show or warning in good time; It is characterized in that: also comprise the frequency phase lock loop circuit; Described frequency phase lock loop circuit can be adjusted automatically according to the signal of signal amplifier input and the frequency plot difference between the reference signal and the output signal of generation and the input signal same frequency of described signal amplifier reception, exports to central processing unit again.
Described frequency phase lock loop circuit can further comprise phase detector, loop filter and voltage controlled oscillator, phase differential between the input signal of described phase detector reception and more described signal amplifier and the benchmark output signal of described voltage controlled oscillator, described loop filter receives the output signal and the filtering high frequency noise wherein of described phase detector; Described voltage controlled oscillator is exported to central processing unit again according to the output signal of the input signal same frequency of the automatic adjustment of the output signal of described loop filter and generation and described signal amplifier.
After adopting the utility model technology, owing between the amplifier of existing radar for backing car and central processing unit, set up the phase-locked loop circuit that can carry out frequency-tracking and frequency lock, therefore, even frequency drift phenomenon has to a certain degree taken place in ultrasound wave after reflection, the utility model also can capture the close echo signal exactly, guaranteed that central processing unit can obtain the measuring and calculating of in good time, the correct distance that can reflect vehicle body surrounding environment or barrier, analyze data source, for the Azimuth ﹠ Range of the correct disturbance in judgement thing of user provides guarantee.
The purpose of this utility model, feature and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Description of drawings
Fig. 1 is the circuit block diagram of existing reversing radar of vehicle;
Fig. 2 is the circuit block diagram of a kind of reversing radar of vehicle described in the utility model;
Fig. 3 is the circuit theory diagrams of a kind of embodiment of reversing radar of vehicle described in the utility model.
Concrete embodiment
With reference to Fig. 2, a kind of reversing radar of vehicle, comprise one or more emission ultrasonic ranging signals and receive the ultrasonic emitting and the receiver 1 of close echo signal, purpose be for the existence of surveying the barrier of different azimuth around the vehicle body more accurately whether and distance; Also comprise with described ultrasonic emitting and receiver 1 and be docile and obedient preface front-end processing circuit 2 of joining and the signal amplifier 3 that amplifies the close echo signal; Warning device 5 can receive the output signal of central processing unit 4 and show or warning in good time; Above-mentioned front-end processing circuit 2, signal amplifier 3, all available prior art of warning device 5 design in common mode and work, the utility model has been set up a frequency phase lock loop circuit 6 especially in order to realize carrying out the function of frequency-tracking and frequency lock between signal amplifier 3 and central processing unit 4; Described frequency phase lock loop circuit 6 can be according to the signal and the reference signal of signal amplifier 3 inputs, it is the frequency plot difference between the reference signal of native system device emission and adjusting automatically and the output signal of generation and the input signal same frequency of described signal amplifier 3 receptions, export to central processing unit 4 again, central processing unit just can obtain in good time, the correct distance that can reflect the vehicle body peripheral obstacle and/or the analysis data source in orientation like this, for the Azimuth ﹠ Range of the correct disturbance in judgement thing of user provides guarantee.
Above-mentioned frequency phase lock loop circuit 6 can further comprise phase detector 61, loop filter 63 and voltage controlled oscillator 62; Phase differential between the benchmark output signal that the input signal of phase detector 61 receptions and comparison signal amplifier 3 and voltage controlled oscillator 62 self produce, loop filter 63 receives the output signal and the filtering high frequency noise wherein of phase detectors 61; Voltage controlled oscillator 62 is exported to central processing unit 4 again according to the output signal of the input signal same frequency of the automatic adjustment of the output signal of loop filter 63 and generation and described signal amplifier 3.
Principle of work of the present utility model is such: carry out pre-treatment through front-end processing circuit 2 with universal mode from the signal of each above-mentioned ultrasonic receiver output, and the signal after will handling transfers to 3 pairs of close echo signals of signal amplifier and amplifies, and the signal after the amplification is handled by the phase detector in the frequency phase lock loop circuit 6 61, loop filter 63 and voltage controlled oscillator 62 again.Phase detector 61 is actually a phase comparison device, and it is input signal S
i(t) and the benchmark output signal S that produces of voltage controlled oscillator self
o(t) phase place compares, and produces the error voltage S corresponding to two signal phase differences
e(t); The effect of loop filter 63 is filtering error voltage S
e(t) radio-frequency component in and noise to guarantee the desired signal performance of loop, increase the stability of system; Voltage controlled oscillator 62 receives the error control voltage S of loop filter 63 outputs
d(t) control, the Automatic Frequency that makes voltage controlled oscillator is to input signal S
i(t) frequency is drawn close, and locks until eliminating frequency difference.Frequency phase lock loop circuit 6 is phase error control system, the benchmark output signal S that its comparator input signal and voltage controlled oscillator self produces
o(t) phase differential between, thus error control voltage S produced
d(t) also follow the tracks of input signal S according to this
i(t) frequency is to reach the purpose of following the tracks of with frequency within the specific limits with input signal.
When frequency phase lock loop circuit 6 is started working, if input signal S
i(t) the benchmark output signal S that frequency and voltage controlled oscillator self produces
o(t) frequency difference, then owing to have intrinsic difference on the frequency between two signals, the phase differential between them certainly will change always, the error voltage S of phase detector 61 outputs as a result
e(t) just change error voltage S within the specific limits
e(t) behind loop filter 63 filterings high frequency noise wherein, produce error control voltage S
d(t), at this error control voltage S
d(t) under the effect, the frequency of voltage controlled oscillator 62 is also changing.When the frequency change of voltage controlled oscillator 62 when equating with frequency input signal, the output signal of voltage controlled oscillator 62 just under autostable on this frequency, reach stablize after, input signal S
i(t) and the frequency difference exported between the signal of central processing unit 4 of voltage controlled oscillator be zero, differ no longer in time and change, at this moment, error control voltage is a fixed value, and the loop that is made of phase detector 61, loop filter 63 and voltage controlled oscillator 62 just enters " locking " state.The roughly process of Here it is frequency phase lock loop circuit 6 work, central processing unit 4 receive the correctly distance of disturbance in judgement thing of signal that frequency phase lock loop circuit 6 provides.
In a kind of embodiment of the present utility model, the model that frequency phase lock loop circuit 6 can directly adopt PANASONIC (NATIONAL) company to produce is IC chip and the auxiliary circuit thereof of LM567, the input end of described IC chip, output terminal connects the output terminal of signal amplifier 3 respectively, the input end of central processing unit 4, the primary structure of this chip or principle are with above-mentioned phase detector, loop filter and voltage controlled oscillator integrate, Fig. 3 shows the circuit theory diagrams of the present utility model that use this chip, consider the similarities and differences with other circuit block diagrams of prior art, only show the partial circuit schematic diagram of central processing unit 4 and frequency phase lock loop circuit 6 among the figure, wherein central processing unit 4 can use model to get final product as IC chip and the auxiliary circuit thereof of PIC16F72, circuit in the dashed rectangle is for including phase detector, IC chip and the auxiliary circuit thereof of the LM567 of loop filter and voltage controlled oscillator should be realized the purpose of this utility model according to this.
Claims (3)
1. reversing radar of vehicle, comprise emission ultrasonic ranging signal and receive the ultrasonic emitting and the receiver (1) of close echo signal, and be docile and obedient the front-end processing circuit (2) that preface joins and the signal amplifier (3) of amplification close echo signal with described ultrasonic emitting and receiver (1); Warning device (5) can receive the output signal of central processing unit (4) and show or warning in good time; It is characterized in that: also comprise frequency phase lock loop circuit (6); Described frequency phase lock loop circuit (6) can be adjusted automatically according to the signal of signal amplifier (3) input and the frequency plot difference between the reference signal and the output signal of generation and the input signal same frequency of described signal amplifier (3) reception, exports to central processing unit (4) again.
2. a kind of reversing radar of vehicle as claimed in claim 1, it is characterized in that: described frequency phase lock loop circuit (6) further comprises phase detector (61), loop filter (63) and voltage controlled oscillator (62), phase differential between the input signal of described phase detector (61) reception and more described signal amplifier (3) and the benchmark output signal of described voltage controlled oscillator (62), described loop filter (63) receives the output signal and the filtering high frequency noise wherein of described phase detector (61); Described voltage controlled oscillator (62) is exported to central processing unit (4) again according to the output signal of the input signal same frequency of the automatic adjustment of output signal of described loop filter (63) and generation and described signal amplifier (3).
3. a kind of reversing radar of vehicle as claimed in claim 1, it is characterized in that: described frequency phase lock loop circuit (6) is IC chip and the auxiliary circuit thereof of LM567 for the model that MAT produces, and the input end of described IC chip, output terminal connect the input end of the output terminal of described signal amplifier (3), described central processing unit (4) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088316 CN2733379Y (en) | 2004-09-15 | 2004-09-15 | A car reversing radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088316 CN2733379Y (en) | 2004-09-15 | 2004-09-15 | A car reversing radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2733379Y true CN2733379Y (en) | 2005-10-12 |
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ID=35069219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420088316 Expired - Fee Related CN2733379Y (en) | 2004-09-15 | 2004-09-15 | A car reversing radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2733379Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590614A (en) * | 2012-03-16 | 2012-07-18 | 无锡鑫立奥机电有限公司 | Detection system and detection method of ultrasonic frequency |
| CN104176043A (en) * | 2014-08-13 | 2014-12-03 | 芜湖航飞科技股份有限公司 | Vehicle-mounted radar |
| CN104670069A (en) * | 2015-01-28 | 2015-06-03 | 长城汽车股份有限公司 | Back-up lamp switch, transmission and automobile |
| CN107765254A (en) * | 2017-09-22 | 2018-03-06 | 合肥晟泰克汽车电子股份有限公司 | The hair wave frequency rate adaptive approach of ultrasonic radar |
| CN115079158A (en) * | 2022-08-24 | 2022-09-20 | 珠海正和微芯科技有限公司 | FMCW radar ranging device and method based on phase tracking, electronic device and medium |
-
2004
- 2004-09-15 CN CN 200420088316 patent/CN2733379Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590614A (en) * | 2012-03-16 | 2012-07-18 | 无锡鑫立奥机电有限公司 | Detection system and detection method of ultrasonic frequency |
| CN104176043A (en) * | 2014-08-13 | 2014-12-03 | 芜湖航飞科技股份有限公司 | Vehicle-mounted radar |
| CN104670069A (en) * | 2015-01-28 | 2015-06-03 | 长城汽车股份有限公司 | Back-up lamp switch, transmission and automobile |
| CN107765254A (en) * | 2017-09-22 | 2018-03-06 | 合肥晟泰克汽车电子股份有限公司 | The hair wave frequency rate adaptive approach of ultrasonic radar |
| CN107765254B (en) * | 2017-09-22 | 2021-03-16 | 合肥晟泰克汽车电子股份有限公司 | Wave-emitting frequency self-adaption method of ultrasonic radar |
| CN115079158A (en) * | 2022-08-24 | 2022-09-20 | 珠海正和微芯科技有限公司 | FMCW radar ranging device and method based on phase tracking, electronic device and medium |
| CN115079158B (en) * | 2022-08-24 | 2022-11-18 | 珠海正和微芯科技有限公司 | FMCW radar ranging device, FMCW radar ranging method, electronic device and FMCW radar ranging medium based on phase tracking |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |