CN103634023A - High-precision width-suitable pulse answering circuit and method - Google Patents
High-precision width-suitable pulse answering circuit and method Download PDFInfo
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Abstract
The invention provides a high-precision width-suitable pulse answering circuit and method, wherein the circuit is characterized in that a query signal of a gauss or cos/cos2 pulse enters a power divider by a signal conditioning circuit and is divided into two paths of signals; the first path of signal is amplified by a signal amplifier, and the second path of signal realizes the high-resolution digital delay by a high-resolution digital delay circuit; the two paths of signals respectively pass by a serially connected passive lowpass filter and enter a comparer after interference signals are filtered out, so a high-precision answering signal is generated; the signal conditioning circuit, the signal amplifier and the comparer are respectively connected with a discrete power supply and a low-voltage stabilizer, so the noise interference is avoided. By adopting the scheme, the highest noise proofing treatment is realized, the environment adaptivity of equipment is greatly improved by lowpass filtering, the power supply processing and the hollowing isolation of a circuit board, meanwhile, distortion signal interference is avoided and the effective guarantee of a triggering precision is provided.
Description
Technical field
The invention belongs to technical field of measurement and test, pulse reply circuit and method that in particular a kind of high accuracy and wide cut adapt to.
Background technology
The equipments such as pulse reply technology is widely used in the distance test of navigator, commonly VOR, Tacan and precise distance measurement, widely apply in the field that airborne, surface beacon, simulator and test etc. are relevant.The pulse signal form of this patent mainly refers to Gaussian pulse and cos/cos2 pulse.
Complex electromagnetic environment has been the normality of modern war, be very easy to cause the signal height on crisscross on changeable, spatial domain, energy that happens suddenly in time domain to distribute, therefore design and a kind ofly can resist various noise signals to disturb, and can to adapt to wide level amplitude circuits for triggering be very important.The Navigation Equipment at present a lot of fields all fails to adapt to timely the complex electromagnetic environment under modernized war condition, particularly shoran Simulator design is especially backward, modern war has harsh requirement to the amplitude of electromagnetic environment signal, can not meet the demand for development of equipment.
Therefore, there is defect in prior art, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, the pulse reply circuit and the method that provide a kind of high accuracy and wide cut to adapt to.
Technical scheme of the present invention is as follows:
The pulse reply circuit that a kind of high accuracy and wide cut adapt to, wherein, comprise signal conditioning circuit, discrete power, low pressure pressurizer, power splitter, signal amplifier, high resolution digital delaying circuit, passive low ventilating filter, comparator and PCB hollow out spacer assembly; The request signal of Gauss or cos/cos2 pulse adjusts finishing circuit to enter after power splitter by signal, be divided into two paths of signals, the first via is carried out the amplification of signal by signal amplifier, high-resolution digital delay is realized by high-resolution digital delaying circuit in the second tunnel, two paths of signals is the passive low ventilating filter through connecting respectively, after filtering interference signals, thereby enter comparator, produce the high-precision triggering signal of replying; Described comparator is around by the interference of PCB hollow out spacer assembly isolation outer signals; Described signal conditioning circuit, described signal amplifier and described comparator are also connected with described discrete power and described low pressure pressurizer respectively, to avoid the noise crosstalk interference of power supply.
The pulse reply circuit that described high accuracy and wide cut adapt to, wherein, described high resolution digital delaying circuit is set to the precise time that predetermined conditioning signal postpones.
The pulse reply circuit that described high accuracy and wide cut adapt to, wherein, the precise time of described predetermined conditioning signal development is for to carry out signal after digital high-speed quantification, after the delay of 20ns at least, transmission after the digital-to-analogue of carrying out signal transforms.
The pulse reply circuit that described high accuracy and wide cut adapt to, wherein, the two paths of signals of the phase such as described two paths of signals is constant amplitude.
The pulse reply method that described high accuracy and wide cut adapt to, wherein, comprises the following steps:
Step 1: the request signal of Gauss or cos/cos2 pulse enters after power splitter by signal conditioning circuit, be divided into two paths of signals, the first via is carried out the amplification of signal by signal amplifier 12, high-resolution digital delay is realized by high-resolution digital delaying circuit in the second tunnel, two paths of signals is the passive low ventilating filter through connecting respectively, after filtering interference signals, thereby enter comparator, produce the high-precision triggering signal of replying;
Step 2: described comparator is around by the interference of PCB hollow out spacer assembly isolation outer signals; Described signal conditioning circuit, described signal amplifier and described comparator are also connected with described discrete power and described low-dropout regulator respectively, to avoid the noise crosstalk interference of power supply.
The pulse reply method that described high accuracy and wide cut adapt to, wherein, the performing step of described high-resolution digital delaying circuit is: according to different pulse lengths, half that the time that delay circuit is set is the burst length.
The pulse reply method that described high accuracy and wide cut adapt to, wherein, described passive low ventilating filter is two, and the bandwidth of passive low ventilating filter described in synchronous interaction; When the signal of two-way enters after passive low ventilating filter, filter out in two paths of signals, parasitic signal, only retains the signal specific needing.
Adopt such scheme, realized high-resolution digital delay, can, in the delay of minimum precision 20ns, support to control arbitrarily, and existing technology be difficult to be accurate to 20ns.The present invention has realized high anti-noise and has processed, and by the processing of low-pass filtering, power supply and the hollow out of circuit board, isolates, and improves greatly the environmental suitability of equipment, also avoids distorted signal to disturb simultaneously, and effective assurance of triggering precision is provided.In addition, the triggering that the present invention divides two-way relatively to realize wide cut by merit, and fixed level triggers the variation that is difficult to adapt to different capacity.
Accompanying drawing explanation
Fig. 1 is the structural representation of the pulse reply of high accuracy of the present invention and wide cut adaptation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
As shown in Figure 1, the pulse reply that high accuracy and wide cut adapt to comprises discrete power 10, signal conditioning circuit 14, power splitter 15, high-resolution digital delay circuit 16, passive low ventilating filter 17, comparator 20 and pcb board hollow out spacer assembly 21.The request signal of Gauss or cos/cos2 pulse, enter power splitter 15, be divided into two paths of signals, the signal amplifier 12 of leading up to carries out the amplification of signal, the high-resolution digital delay 16 of separately leading up to is realized high-resolution digital delay, and two paths of signals passes through respectively passive low ventilating filter 13,17, after filtering interference signals, enter the comparator 20 of strict isolation, thereby produce the high-precision triggering signal of replying.Different circuit section power supply is independently, adopted different discrete powers, as 10,18, they all directly access by general supply single-point, do not share power supply with other any circuit midway, and responsive circuit is carried out to filtering noise again such as 12,20 through low- dropout regulator 11,19, avoid the noise crosstalk interference of power supply, at comparator 20, by hollow out PCB21, isolate the interference of outer signals around, improved greatly the stability of comparison circuit 20, and high-resolution digital delay can be realized accurate calibration.
The type of pulse can be selected, and conventionally only between Gaussian pulse and cos/cos2 pulse, selects, and high-resolution digital delay circuit 16 is along with pulse pattern is synchronously adjusted, when selecting Gaussian pulse Shi， mono-road signal to need accurately to postpone 3us; When selecting cos/cos2 pulse, need accurately to postpone 0.8us; Another road signal amplifies twice, two-way enters after passive filter 13,17, also different by the type of signal, the passive filter of synchronous change different bandwidth, realize the noiseless comparison of high accuracy of signal, the transmitting trigger condition of replying triggering left and right answer signal of generation.
Under this technical scheme, need to adopt high-precision clock source, and sample rate be 100MSa/s ADC and DAC, postpone mainly among FPGA, to realize, the internal work clock of FPGA operates in stable 200MHz, and needs the strict hard wired logic of controlling FPGA inside, the accurate internal latency that guarantees FPGA, in addition, the outside interference of having avoided thoroughly power supply and space, can control triggering very easily.
Embodiment 2
On the basis of above-described embodiment, further, the pulse reply circuit that provides a kind of high accuracy and wide cut to adapt to, wherein, comprise signal conditioning circuit, discrete power, low-dropout regulator, power splitter, signal amplifier, high resolution digital delaying circuit, passive low ventilating filter, comparator and PCB hollow out spacer assembly; The request signal of Gauss or cos/cos2 pulse enters after power splitter by signal conditioning circuit, be divided into two paths of signals, the first via is carried out the amplification of signal by signal amplifier 12, high-resolution digital delay is realized by high-resolution digital delaying circuit in the second tunnel, two paths of signals is the passive low ventilating filter through connecting respectively, after filtering interference signals, thereby enter comparator, produce the high-precision triggering signal of replying; Described comparator is around by the interference of PCB hollow out spacer assembly isolation outer signals; Described signal conditioning circuit, described signal amplify electric number and described comparator is also connected with described discrete power and described low-dropout regulator respectively, to avoid the noise crosstalk interference of power supply.
Described high resolution digital delaying circuit is set to the precise time that predetermined conditioning signal postpones.
The precise time that described predetermined conditioning signal postpones is for to carry out signal after digital high-speed quantification, after the delay of 20ns at least, and transmission after the digital-to-analogue of carrying out signal transforms.
Described two paths of signals is the two paths of signals of the phases such as constant amplitude.
A kind of pulse reply method that the present invention also provides high accuracy and wide cut to adapt to, comprises the following steps:
Step 1: the request signal of Gauss or cos/cos2 pulse adjusts finishing circuit to enter after power splitter by signal, be divided into two paths of signals, the first via is carried out the amplification of signal by signal amplifier 12, high-resolution digital delay is realized by high-resolution digital delaying circuit in the second tunnel, two paths of signals is the passive low ventilating filter through connecting respectively, after filtering interference signals, thereby enter comparator, produce the high-precision triggering signal of replying;
Step 2: described comparator is around by the interference of PCB hollow out spacer assembly isolation outer signals; Described signal conditioning circuit, described signal amplify electric number and described comparator is also connected with described discrete power and described low-dropout regulator respectively, to avoid the noise crosstalk interference of power supply.
In above-mentioned steps, the performing step of described high-resolution digital delaying circuit is: according to different pulse lengths, and half that the time that delay circuit is set is the burst length.If the pulse of 6us time span, need arrange and postpone 3us, be half of burst length length; Counting clock in FPGA inside is 200MHz, and a clock is 0.5us, and therefore 600x0.5us=3us need to postpone the cycle of 600 clocks; In like manner, if postpone 0.8us, the cycle needing is 160.
In above-mentioned steps, described passive low ventilating filter is two, and the bandwidth of passive low ventilating filter described in synchronous interaction; When the signal of two-way enters after passive low ventilating filter, filter out in two paths of signals, parasitic signal, only retains the signal specific needing.The bandwidth of different signal demand passive low ventilating filters is different, and according to the bandwidth of plate level introducing interference signal, carries out the bandwidth Design of low pass filter.Generally, the cycle is the Gaussian pulse signal of 0.6us, need to design the low-pass filtering bandwidth of 500kHz.
Adopt such scheme, realized high-resolution digital delay, can, in the delay of minimum precision 20ns, support to control arbitrarily, and existing technology be difficult to be accurate to 20ns.The present invention has realized high anti-noise and has processed, and by the processing of low-pass filtering, power supply and the hollow out of circuit board, isolates, and improves greatly the environmental suitability of equipment, also avoids distorted signal to disturb simultaneously, and effective assurance of triggering precision is provided.In addition, the triggering that the present invention divides two-way relatively to realize wide cut by merit, and fixed level triggers the variation that is difficult to adapt to different capacity.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (7)
1. the pulse reply circuit that a high accuracy and wide cut adapt to, it is characterized in that, comprise signal conditioning circuit, discrete power, low pressure pressurizer, power splitter, signal amplifier, high resolution digital delaying circuit, passive low ventilating filter, comparator and PCB hollow out spacer assembly; The request signal of Gauss or cos/cos2 pulse adjusts finishing circuit to enter after power splitter by signal, be divided into two paths of signals, the first via is carried out the amplification of signal by signal amplifier, high-resolution digital delay is realized by high-resolution digital delaying circuit in the second tunnel, two paths of signals is the passive low ventilating filter through connecting respectively, after filtering interference signals, thereby enter comparator, produce the high-precision triggering signal of replying; Described comparator is around by the interference of PCB hollow out spacer assembly isolation outer signals; Described signal conditioning circuit, described signal amplify electricity number and described comparator and are also connected with described discrete power and described low pressure pressurizer respectively, to avoid the noise crosstalk interference of power supply.
2. the pulse reply circuit that high accuracy as claimed in claim 1 and wide cut adapt to, is characterized in that, described high resolution digital delaying circuit is set to the precise time of predetermined conditioning signal development.
3. the pulse reply circuit that high accuracy as claimed in claim 2 and wide cut adapt to, it is characterized in that, the precise time of described predetermined conditioning signal development is for to carry out signal after digital high-speed quantification, after the delay of 20ns at least, and transmission after the digital-to-analogue of carrying out signal transforms.
4. the two paths of signals of the phases such as the pulse reply circuit that high accuracy as claimed in claim 1 and wide cut adapt to, is characterized in that, described two paths of signals is constant amplitude.
5. the pulse reply method that high accuracy as claimed in claim 1 and wide cut adapt to, is characterized in that, comprises the following steps:
Step 1: the request signal of Gauss or cos/cos2 pulse adjusts finishing circuit to enter after power splitter by signal, be divided into two paths of signals, the first via is carried out the amplification of signal by signal amplifier 12, high-resolution digital delay is realized by high-resolution digital delaying circuit in the second tunnel, two paths of signals is the passive low ventilating filter through connecting respectively, after filtering interference signals, thereby enter comparator, produce the high-precision triggering signal of replying;
Step 2: described comparator is around by the interference of PCB hollow out spacer assembly isolation outer signals; Described signal conditioning circuit, described signal amplify electricity number and described comparator and are also connected with described discrete power and described low pressure pressurizer respectively, to avoid the noise crosstalk interference of power supply.
6. the pulse reply method that high accuracy as claimed in claim 5 and wide cut adapt to, is characterized in that, the performing step of described high-resolution digital delaying circuit is: according to different pulse lengths, and half that the time that delay circuit is set is the burst length.
7. the pulse reply method that high accuracy as claimed in claim 5 and wide cut adapt to, is characterized in that, described passive low ventilating filter is two, and the bandwidth of passive low ventilating filter described in synchronous interaction; When the signal of two-way enters after passive low ventilating filter, filter out in two paths of signals, parasitic signal, only retains the signal specific needing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104714207A (en) * | 2014-12-10 | 2015-06-17 | 中国电子科技集团公司第二十研究所 | TACAN beacon simulator ranging response probability implementation method |
| CN105634438A (en) * | 2014-11-26 | 2016-06-01 | 恩智浦有限公司 | A low-pass filter |
| CN106679694A (en) * | 2015-12-20 | 2017-05-17 | 中国电子科技集团公司第二十研究所 | TACAN beacon simulator air-to-air response delayed measurement precision calibration apparatus and method |
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| CN1090446A (en) * | 1992-09-18 | 1994-08-03 | 冲电气工业株式会社 | Adaptive equalization receiver and maximum likelihood series are calculated receiver |
| US20040251981A1 (en) * | 1998-06-10 | 2004-12-16 | Shigeru Arisawa | Contactless IC card system |
| JP2007174367A (en) * | 2005-12-22 | 2007-07-05 | Oki Electric Ind Co Ltd | Signal detection circuit |
| CN202940804U (en) * | 2012-11-29 | 2013-05-15 | 南京璇星科技发展有限公司 | Missile-borne coherent multi-station triggering working pulse transponder |
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2013
- 2013-11-26 CN CN201310611965.XA patent/CN103634023B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1090446A (en) * | 1992-09-18 | 1994-08-03 | 冲电气工业株式会社 | Adaptive equalization receiver and maximum likelihood series are calculated receiver |
| US20040251981A1 (en) * | 1998-06-10 | 2004-12-16 | Shigeru Arisawa | Contactless IC card system |
| JP2007174367A (en) * | 2005-12-22 | 2007-07-05 | Oki Electric Ind Co Ltd | Signal detection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634438A (en) * | 2014-11-26 | 2016-06-01 | 恩智浦有限公司 | A low-pass filter |
| CN105634438B (en) * | 2014-11-26 | 2018-07-31 | 恩智浦有限公司 | low-pass filter |
| CN104714207A (en) * | 2014-12-10 | 2015-06-17 | 中国电子科技集团公司第二十研究所 | TACAN beacon simulator ranging response probability implementation method |
| CN104714207B (en) * | 2014-12-10 | 2017-04-12 | 中国电子科技集团公司第二十研究所 | Tacan beacon simulator ranging response probability implementation method |
| CN106679694A (en) * | 2015-12-20 | 2017-05-17 | 中国电子科技集团公司第二十研究所 | TACAN beacon simulator air-to-air response delayed measurement precision calibration apparatus and method |
| CN106679694B (en) * | 2015-12-20 | 2019-12-03 | 中国电子科技集团公司第二十研究所 | The air-air response Time delay measurement Precision calibration device and method of tacan beacon simulator |
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