CN2831266Y - Receiving module having Doppler frequency inhibitory function - Google Patents
Receiving module having Doppler frequency inhibitory function Download PDFInfo
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- CN2831266Y CN2831266Y CNU2005200454227U CN200520045422U CN2831266Y CN 2831266 Y CN2831266 Y CN 2831266Y CN U2005200454227 U CNU2005200454227 U CN U2005200454227U CN 200520045422 U CN200520045422 U CN 200520045422U CN 2831266 Y CN2831266 Y CN 2831266Y
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- doppler frequency
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Abstract
The utility model relates to a receiving module having the Doppler frequency inhibitory function, which is used in the Electronic Toll Collection system (ETC system). The utility model is realized by an I/O frequency mixer, an intermediate frequency prime amplifier, an absolute value detecting circuit, and an addition processing circuit, wherein the frequency mixer provides two paths of output signals with phases differing by 90 DEG; the two paths of output signals are given to the absolute value detecting circuit for obtaining absolute values after respectively magnified through the intermediate frequency prime amplifier; finally the two paths of output signals are output through the addition processing circuit; because of the Doppler frequency inhibitory function, the utility model avoids condition that separate 5.8G signal frequency mixing output is unable to carry out effective detection resulting from the Doppler frequency shift generated from the ETC system at a high vehicle speed, the quality of signal transmission is ensured, the probability generated from the error code in the process of signal transmission is reduced and the accuracy and the stability of the measuring charge of the ETC system are improved.
Description
Technical field
The utility model relates to the receiver module that has the Doppler frequency inhibit feature in a kind of electronic charging system without parking (hereinafter to be referred as the ETC Fare Collection System).
Background technology
In the ETC Fare Collection System, receiver module is wherein important ingredient.Its serviceability quality directly has influence on the serviceability of ETC Fare Collection System.
In charging process, need make promptly and accurately charge based on the ETC Fare Collection System of radio electronic label (RFID) at the different speed of a motor vehicle.Common receiver module is exactly a mixting circuit, and the signal of its output can be subjected to the influence of Doppler shift when the speed of a motor vehicle is too fast, causes the generation with error code of losing of signal, may cause reacting slow or error in charging.
Signal as shown in Figure 1 is in the ideal case, and the modulation signal of 5.8G passes through the signal of exporting after the mixing of 5.8G signal again, compares with initial bpsk signal, does not produce error code.
But Fare Collection System is the too fast problem of the speed of a motor vehicle of process when regular meeting runs into charge in actual use, and the speed of a motor vehicle is too fast, will cause Doppler shift, and the generation of Doppler shift will bring the distorted signals of mixing output, as shown in Figure 2.Clearly, the signal that so gets is compared with the bpsk signal of initial input, and very big error is arranged, and will export behind such signal demodulator, will cause the mistake of data, makes the Fare Collection System cisco unity malfunction, therefore must make improvement at this kind situation.
Summary of the invention
The utility model is a kind of receiver module with Doppler frequency inhibit feature that provides in order to overcome the above-mentioned defective that exists in the prior art, this receiver module is used for the ETC Fare Collection System, because it has the Doppler frequency inhibit feature, the influence that Doppler shift brings is eliminated by the phase Calais after can taking absolute value by two groups of phase phasic differences, 90 degree signals.
The technical measures that the utility model is taked are:
Receiver module with Doppler frequency inhibit feature uses in electronic charging system without parking, is characterized in: comprise an I, Q frequency mixer, two signal conditioning circuits and an addition process circuit; The input end of described two signal conditioning circuits is connected with I, the Q output terminal of I, Q frequency mixer respectively; The output terminal of described two signal conditioning circuits drives input end with addition process circuit addition and is connected; Described I, Q frequency mixer provide the phasic difference of two-way phase 90 degree output signals, and this two paths of signals is exported via the addition process circuit after adjusting through two signal conditioning circuits respectively at last.
Above-mentioned receiver module with Doppler frequency inhibit feature, wherein: mainly identical by two but frequency mixer phase phasic difference 90 degree of described I, Q frequency mixer constitute.
Above-mentioned receiver module with Doppler frequency inhibit feature, wherein: described each signal conditioning circuit mainly is made of intermediate frequency prime amplifier unit and an I, the Q absolute value detecting circuit of order series connection; Described I, Q frequency mixer provide the phasic difference of two-way phase 90 degree output signals, and this two paths of signals is transferred to absolute value circuit and taken absolute value after amplifying through the intermediate frequency prime amplifier respectively, exports via the addition process circuit at last.
Above-mentioned receiver module with Doppler frequency inhibit feature, wherein: described addition process circuit is made of an independent high speed operation amplifier.
Above-mentioned receiver module with Doppler frequency inhibit feature, wherein: described intermediate frequency prime amplifier unit is made of two identical high speed operation amplifiers.
Because the utility model has adopted above technical scheme, therefore it has the Doppler frequency inhibit feature, the Doppler shift of having avoided the ETC Fare Collection System to produce when the speed of a motor vehicle is too fast causes independent 5.8G signal mixing output can't carry out the appearance of the situation of effective detection, guaranteed the quality of signal transmission, reduced the probability that error code produces in the signals transmission, improved the ETC Fare Collection System and measured the accuracy and the stability of charge.
Description of drawings
Concrete structure of the present utility model is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is ideally, and the modulation signal of 5.8G passes through the signal schematic representation of exporting after the mixing of 5.8G signal again.
Fig. 2 is the signal schematic representation of the distorted signals of the mixing output that produces owing to Doppler shift under actual conditions in the prior art.
Fig. 3 is the circuit block diagram that the utlity model has the receiver module of Doppler frequency inhibit feature.
Fig. 4 is the wiring diagram that the utlity model has absolute value detecting circuit in the receiver module of Doppler frequency inhibit feature.
A among Fig. 5, b, c, d, e are respectively each stage signal output synoptic diagram in the wiring diagram of Fig. 4 absolute value detecting circuit.
A, b are respectively the signal schematic representations after the mixing of the I that the utlity model has the receiver module of Doppler frequency inhibit feature, the output of Q frequency mixer among Fig. 6.
A, b are respectively the signal schematic representations after the detection of the I that the utlity model has the receiver module of Doppler frequency inhibit feature, the output of Q absolute value detecting circuit among Fig. 7.
Fig. 8 is the signal schematic representation of addition process circuit output that the utlity model has the receiver module of Doppler frequency inhibit feature.
Embodiment
See also Fig. 3.The utlity model has the receiver module of Doppler frequency inhibit feature, use in the ETC Fare Collection System, comprise an I, Q frequency mixer 1, two signal conditioning circuits 2 and an addition process circuit 3.The input end of two signal conditioning circuits is connected with I, the Q output terminal of I, Q frequency mixer respectively.Described I, Q frequency mixer 1 mainly are made of the frequency mixer of two phase phasic differences, 90 degree.Described each signal conditioning circuit 2 mainly is made of intermediate frequency prime amplifier unit 21 and an I, the Q absolute value detecting circuit 22 of order series connection; Described I, Q frequency mixer provide the phasic difference of two-way phase 90 degree output signals, and this two paths of signals is transferred to absolute value circuit and taken absolute value after amplifying through the intermediate frequency prime amplifier respectively, exports via the addition process circuit at last.The I, the Q mixer unit that the utlity model has the receiver module of Doppler frequency inhibit feature are made of two identical frequency mixer, intermediate frequency prime amplifier unit is made of two identical high speed amplifiers, the addition process circuit is made of an independent high speed amplifier, because all be ripe circuit, repeat no more.
See also Fig. 4.This is the wiring diagram that the utlity model has the 22 1 kinds of embodiment of each absolute value detecting circuit in the receiver module of Doppler frequency inhibit feature.It comprises that mainly one regulates zero level circuit and an operational amplifier U1.Regulating the zero level circuit mainly is made of potentiometer R4 and R12.
See also Fig. 5.A among Fig. 5, b, c, d, e are respectively each stage signal output synoptic diagram in the wiring diagram of Fig. 4 absolute value detecting circuit.
Be divided into two-way after the input end input of mixed frequency signal (shown in Fig. 5 a) by circuit, A road signal is given 6 ends of the U1:B of operational amplifier U1 by resistance R 1; B road signal then is sent to 2 ends of the U1:A of operational amplifier U1 earlier, and after diode V1, V2 detection, the signal of output (shown in Fig. 5 b) is sent into 6 ends of the U1:B of operational amplifier U1 via resistance R 10.Get R1=R2=2R10 in the present embodiment.
The two paths of signals of 6 ends of sending into the U1:B of operational amplifier U1 has passed through the anti-phase adding circuit that the U1:B by operational amplifier U1 constitutes, wherein after the signal inversion of A road shown in Fig. 5 d, after B road signal inversion is amplified 2 times shown in Fig. 5 c.After the two paths of signals addition, obtain the signal shown in Fig. 5 e.
Can find that by Fig. 5 a shown in above relatively and the signal of Fig. 5 e signal has carried out the absolute value detection to be handled.
See also Fig. 6～7.The receiver module that the utlity model has the Doppler frequency inhibit feature provides a kind of approach to solve the problem that Doppler shift brings.In module, the 5.8G modulation signal is divided into I, Q two-way carries out mixing respectively, the signal phase after the mixing differs 90 degree, and signal is exported shown in a, b two width of cloth figure among Fig. 6.Wherein a is an I road mixed frequency signal output synoptic diagram, and b is a Q road mixed frequency signal output synoptic diagram.
Two paths of signals is after respectively via the absolute value detecting circuit, and signal is exported shown in a, b two width of cloth figure among Fig. 7.Wherein a is an output synoptic diagram after I road mixed frequency signal takes absolute value, and b is an output synoptic diagram after Q road mixed frequency signal takes absolute value.
The I of absolute value detecting circuit output, Q two paths of signals just can obtain output signal as shown in Figure 8 again via the addition process circuit, and it is compared with initial bpsk signal, and signal is not lost, and does not have the generation of error code yet.The utility model only need in subsequent conditioning circuit with the signal of addition process circuit output in addition shaping just can obtain ideally the resulting signal of 5.8G mixing.So, this module has realized suppressing the function of Doppler frequency, can solve the influence that Doppler shift that the speed of a motor vehicle causes when too fast brings.
The receiver module that the utlity model has the Doppler frequency inhibit feature is used for the ETC Fare Collection System, avoided the ETC Fare Collection System in charging process because the losing of the signal that the speed of a motor vehicle too fast Doppler shift that causes causes, guarantee the accuracy of acknowledge(ment) signal in the ETC Fare Collection System, improved the accuracy and the stability of Fare Collection System charge.
Claims (5)
1, the receiver module that has the Doppler frequency inhibit feature uses in electronic charging system without parking, it is characterized in that: comprise an I, Q frequency mixer, two signal conditioning circuits and an addition process circuit; The input end of described two signal conditioning circuits is connected with I, the Q output terminal of I, Q frequency mixer respectively; The output terminal of described two signal conditioning circuits drives input end with addition process circuit addition and is connected; Described I, Q frequency mixer provide the phasic difference of two-way phase 90 degree output signals, and this two paths of signals is exported via the addition process circuit after adjusting through two signal conditioning circuits respectively at last.
2, the receiver module with Doppler frequency inhibit feature according to claim 1 is characterized in that: mainly identical by two but frequency mixer phase phasic difference 90 degree of described I, Q frequency mixer constitute.
3, the receiver module with Doppler frequency inhibit feature according to claim 1 is characterized in that: described each signal conditioning circuit mainly is made of intermediate frequency prime amplifier unit and an I, the Q absolute value detecting circuit of order series connection; Described I, Q frequency mixer provide the phasic difference of two-way phase 90 degree output signals, and this two paths of signals is transferred to absolute value circuit and taken absolute value after amplifying through the intermediate frequency prime amplifier respectively, exports via the addition process circuit at last.
4, the receiver module with Doppler frequency inhibit feature according to claim 1 is characterized in that: described addition process circuit is made of an independent high speed operation amplifier.
5, the receiver module with Doppler frequency inhibit feature according to claim 3 is characterized in that: described intermediate frequency prime amplifier unit is made of two identical high speed operation amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200454227U CN2831266Y (en) | 2005-09-29 | 2005-09-29 | Receiving module having Doppler frequency inhibitory function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200454227U CN2831266Y (en) | 2005-09-29 | 2005-09-29 | Receiving module having Doppler frequency inhibitory function |
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| CN2831266Y true CN2831266Y (en) | 2006-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2005200454227U Expired - Fee Related CN2831266Y (en) | 2005-09-29 | 2005-09-29 | Receiving module having Doppler frequency inhibitory function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540262A (en) * | 2010-12-27 | 2012-07-04 | 中国电子科技集团公司第五十研究所 | Nonlinear node detector |
| CN103346992A (en) * | 2013-06-26 | 2013-10-09 | 中国科学院计算技术研究所 | Doppler changing rate estimating method and system in OFDM system |
| CN103560753A (en) * | 2008-07-17 | 2014-02-05 | Bea股份公司 | Mixer structure for doppler radar applications and doppler radar sensor |
-
2005
- 2005-09-29 CN CNU2005200454227U patent/CN2831266Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560753A (en) * | 2008-07-17 | 2014-02-05 | Bea股份公司 | Mixer structure for doppler radar applications and doppler radar sensor |
| CN102540262A (en) * | 2010-12-27 | 2012-07-04 | 中国电子科技集团公司第五十研究所 | Nonlinear node detector |
| CN102540262B (en) * | 2010-12-27 | 2013-10-30 | 中国电子科技集团公司第五十研究所 | Nonlinear node detector |
| CN103346992A (en) * | 2013-06-26 | 2013-10-09 | 中国科学院计算技术研究所 | Doppler changing rate estimating method and system in OFDM system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061025 Termination date: 20120929 |