CN202837534U - Distributed receiver and external active calibration device using same - Google Patents
Distributed receiver and external active calibration device using same Download PDFInfo
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- CN202837534U CN202837534U CN 201220549824 CN201220549824U CN202837534U CN 202837534 U CN202837534 U CN 202837534U CN 201220549824 CN201220549824 CN 201220549824 CN 201220549824 U CN201220549824 U CN 201220549824U CN 202837534 U CN202837534 U CN 202837534U
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Abstract
The utility model discloses a distributed receiver and an external active calibration device using the same. The distributed receiver comprises a low-noise amplifier, a Gaussian matched filter, a radio frequency logarithmic detector, a matching circuit, an AD (analog/digital) conversion circuit and a photovoltaic conversion optical fiber transmitter which are sequentially connected. The external active calibration device comprises a reply signal simulator, a 1:n power divider, n distributed receivers and n signal processors. By the aid of the direct radio frequency logarithmic detection technology, distortion of reply pulses and particularly deterioration of the pulse rising edge caused by a frequency mixing link can be avoided, hardware circuit units such as a frequency mixer, a 1030MHz frequency synthesizer and a 60MHz intermediate-frequency filter are omitted, and MDS (multi-static dependent surveillance) system device quantity and system cost are reduced. The external active calibration device is used for calibration of self transmission and processing delay of the distributed receivers, and accordingly time-difference localization precision of an MDS system is improved.
Description
Technical field
The utility model relates to a kind of receiver for the multipoint positioning airport scene monitoring system, in particular a kind of distributed reception machine and use the external active calibration device of this distributed reception machine.
Background technology
Multipoint positioning airport scene monitoring system (Multi-static Dependent Surveillance, MDS) be a kind of novel system that is applied to target identification and spatial domain supervision, this system is at present based on secondary radar (Secondary Surveillance Radar, SSR) on the basis of air traffic control system, utilize the distributed reception machine to receive the SSR answer signal of global general-use, the step-out time that arrives each receiver by signal positions, and the MDS technology is to alleviate at present growing air traffic control pressure, promote near one of gordian technique of the ability to supervise in airport under the complex environment.Typical 15～20 distributed reception machines of MDS system one general configuration, receiver catch near the answering machine signal from different platform in airport, finish the functions such as low noise amplification, low distortion filtering, envelope extraction, high-speed sampling, time calibrating and data transmission.
For the MDS system, accurate step-out time (Time Difference of Arrival, TDOA) estimates it is the key that realizes hi-Fix.The distributed reception machine all may affect the degree of distortion of transponder pulse to a plurality of processing links such as filtering, the sampling etc. of answer signal, and then affects time difference estimated accuracy and bearing accuracy.Because the MDS system makes up on the SSR basis, the function class of MDS receiver and SSR receiver all is reception and the radio frequency processing that will finish the 1090MHz answer signal seemingly, and is therefore the same with the SSR receiver, the MDS receiver generally also is to adopt intermediate frequency logarithmic detector scheme, as shown in Figure 1.In this scheme, receiver at first carries out low noise amplification and filtering to the 1090MHz answer signal, then carry out mixing with the 1030MHz local oscillator and downconvert to 60MHz, this intermediate-freuqncy signal is carried out carrying out the intermediate frequency logarithmic detector after filtering and the amplification, at last video pulse is carried out the AD conversion, what famous MDS system global supplier ERA company namely adopted is this scheme.But this scheme exists following deficiency: 1) the hybrid festival-gathering of signal brings additional effect to the degree of distortion of transponder pulse especially rising edge of a pulse; 2) optical mixing process needs 1030MHz Frequency Synthesizer and 60MHz intermediate-frequency filter, has increased system equipment amount and system cost.In addition, the MDS system catches the answer signal of transponder by the distributed reception machine, transponder pulse arrives (Time of Arrival time of arrival of each receiver, TOA) be the space hop, and the transmission delay of signal in receiver be should give deduction, and therefore the distributed reception machine being carried out accurate delay correction is to guarantee one of key issue that the MDS system accurately locates.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of distributed reception machine is provided and has used the external active calibration device of this distributed reception machine, can be under the prerequisite of equipment amount still less, realization receives high precision and the low distortion of answer signal, and can carry out accurate correction to the transmission delay of distributed reception machine.
The utility model is achieved through the following technical solutions, and the utility model comprises low noise amplifier, Gauss matched filtering device, radio frequency logarithmic detector, match circuit, AD varying circuit and the opto-electronic conversion optical fiber transmission device that connects successively.
As one of optimal way of the present utility model, described Gauss matched filtering device is five rank Gaussian radio-frequency filters, and bandwidth is 30MHz.
Use the external active calibration device of described distributed reception machine, comprise answer signal simulator, 1:n power splitter, a n distributed reception machine and n signal processor, AC pattern and S pattern answer signal that the answer signal simulator links to each other with the 1:n power splitter and produces with transmission, the input end of 1:n power splitter and n distributed reception machine links to each other and answer signal is divided into the n road is transferred to respectively each distributed reception machine, the output terminal of n distributed reception machine links to each other with corresponding signal processor respectively, n 〉=2 and be integer.
The utility model has the following advantages compared to existing technology: the deterioration that the direct logarithmic detector technology of the radio frequency that the utility model adopts can avoid the mixing link especially to bring to rising edge of a pulse to the degree of distortion of transponder pulse, save simultaneously the hardware circuit unit such as frequency mixer, 1030MHz Frequency Synthesizer and 60MHz intermediate-frequency filter, reduced MDS system equipment amount and system cost;
The Gauss matched filtering technology that the utility model adopts has effectively reduced and has reduced receiver bandwidth and matched filtering type to replying the impact of pulse distortion degree, especially greatly alleviate the deterioration of rising edge and eliminated the porch overshoot phenomenon, thereby improved TDOA estimated accuracy and system accuracy;
The external active calibration device that adopts is proofreaied and correct distributed reception machine self transmission and processing delay, this technique device is simple, realizability is very strong, can accurately measure transmission and the processing delay of receiver self, so that the MDS system can obtain more accurate real goal TDOA, thereby improved the TOA difference locating accuracy of MDS system.
Description of drawings
Fig. 1 is the system chart of the receiver of available technology adopting intermediate frequency logarithmic detector;
Fig. 2 is the system chart that the utility model adopts the receiver of the direct logarithmic detector of radio frequency;
Fig. 3 is receiver bandwidth and the schematic diagram that concerns that receives the output rising edge of a pulse;
Fig. 4 is the receiver output pulse schematic diagram that adopts flat-top filter three dB bandwidth=10MHz;
Fig. 5 is the receiver output pulse schematic diagram that adopts Gauss matched filtering device three dB bandwidth=10MHz;
Fig. 6 is the receiver output pulse schematic diagram that adopts flat-top filter three dB bandwidth=30MHz;
Fig. 7 is the receiver output pulse schematic diagram that adopts Gauss matched filtering device three dB bandwidth=30MHz;
Fig. 8 is the structured flowchart of external active calibration device;
Fig. 9 is that each circuit unit of timing postpones schematic diagram.
Embodiment
The below elaborates to embodiment of the present utility model; the present embodiment is implemented under take technical solutions of the utility model as prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
As shown in Figure 2, the receiver of the present embodiment comprises low noise amplifier 11, Gauss matched filtering device 12, radio frequency logarithmic detector 13, match circuit 14, AD varying circuit 15 and the opto-electronic conversion optical fiber transmission device 16 that connects successively.
After described radio frequency logarithmic detector 13 refers to that receiver carries out low noise amplification and filtering to the transponder pulse of 1090MHz frequency range, directly carry out logarithmic detector in radio band, extract the transponder pulse envelope, just carry out logarithmic detector and be different from the conventional scheme after radiofrequency signal is down-converted to the 60MHz intermediate frequency.The hardware circuit unit such as frequency mixer, 1030MHz Frequency Synthesizer, 60MHz intermediate-frequency filter have been saved again in the impact that the direct logarithmic detector scheme of radio frequency had both avoided the mixing link to bring to transponder pulse degree of distortion especially rising edge of a pulse.
Described Gauss matched filtering device 12 refers to that receiver has adopted five rank Gaussian radio-frequency filters to carry out matched filtering.TDOA estimated accuracy lower limit is directly proportional with the rising edge of transponder pulse, and the rising edge of pulse is relevant with bandwidth and the filtering type of receiver, so the selection of receiver matched filtering bandwidth and type is that the emphasis that designs one of considers a problem.As shown in Figure 3, for the signal characteristic of MDS transponder pulse, analyze with emulation and point out: when receiver bandwidth during less than 10MHz, receiver bandwidth has determined the size of output rising edge of a pulse; When receiver bandwidth during greater than 30MHz, the impact of receiver paired pulses rising edge is very little, and the output rising edge of a pulse depends primarily on input pulse self.In addition, for the 1090MHz transponder pulse of adopting the pulsed modulation mode, the envelope of its signal spectrum is the sinc function, and when the passband characteristic of receiver was complementary with it, receiver output pulse distortion degree was minimum, signal to noise ratio (S/N ratio) is maximum, shown in Fig. 4～7.For the characteristics of MDS system to the demand on the time resolution and transponder pulse signal, the optimal design bandwidth that the present embodiment proposes receiver is 30MHz, the solution that has adopted five rank Gaussian radio-frequency filters to carry out matched filtering, so that receiver is to the almost not deterioration of rising edge size of actual answer signal, the impact of paired pulses degree of distortion is very little, can satisfy better the application demand of MDS system.
As shown in Figure 8, use the external active calibration device of described distributed reception machine, comprise answer signal simulator 2,1:n power splitter 3, a n distributed reception machine and n signal processor 4, AC pattern and S pattern answer signal that answer signal simulator 2 links to each other with 1:n power splitter 3 and produces with transmission, the input end of 1:n power splitter 3 and n distributed reception machine links to each other and answer signal is divided into the n road is transferred to respectively each distributed reception machine, the output terminal of n distributed reception machine links to each other with corresponding signal processor 4 respectively, n 〉=2 and be integer.
The external active calibration device of the present embodiment is to adopt answer signal simulator 2 as outside calibration source, the AC pattern and the S pattern answer signal that produce, signal is delivered to the input end of n distributed reception machine by equiphase 1:n power splitter, signal is inner through low noise amplification, low distortion filtering, radio frequency logarithmic detector, AD conversion at receiver, delivers to signal processor 4(DSP after the Electrooptical-optoelectrical conversion) carry out TOA and measure.
As shown in Figure 9, when receiver carries out delay correction, the 10MHz clock that the central station signal processing system is sent here with the precise synchronization system as a reference, produce 1 millisecond of millisecond pulse for the cycle and deliver to answer signal simulator 2, answer signal simulator 2 with the rising edge of this signal as triggering, produce the AC code of answer signal and the modulating pulse string of S code after postponing the regular hour, thereby and by 1090MHz radio frequency continuous wave signal being modulated generation transponder pulse signal, this radio-frequency response signal is delivered to the input end of n receiver after by equiphase 1:n power splitter and isometric radio-frequency cable, processing by n receiver is delivered to dsp system with its TOA information, record i(i=1,2,, n) forward position of the transponder pulse of individual receiver is τ with the difference of millisecond pulse front edge
i, consider that millisecond burst transmissions postpones τ
I1, the inner milli of answer signal simulator 2 trigger action postpone τ with modulation
I2, 1:n power splitter and isometric transmit by RF cable postpone τ
I3, the then transmission of i receiver self and processing delay Δ τ
iShould be:
Δτ
i=τ
i-τ
i1-τ
i2-τ
i3
After adopting this device accurately to measure the transmission delay of receiver self, data are carried out record, then behind the TOA of system measurement real goal, this part is postponed to carry out the school remove.Because answer signal simulator 2 can produce the analog answer signal of high s/n ratio, low distortion, and there are not a plurality of echo signal stacks and multipath interference problem at timing, the MDS system can more accurately measure the TOA of this signal, in addition the transmission delay τ of each auxiliary circuit equipment in the corrective system
I1, τ
I2, τ
I3Can accurately measure with instrument such as vector network analyzer, oscillographs, therefore can calculate the accurate transmission of receiver self and processing delay by following formula, so system can obtain more accurate TDOA, thereby improved the TOA difference locating accuracy of MDS system.
Claims (3)
1. a distributed reception machine is characterized in that, comprises the low noise amplifier, Gauss matched filtering device, radio frequency logarithmic detector, match circuit, AD varying circuit and the opto-electronic conversion optical fiber transmission device that connect successively.
2. distributed reception machine according to claim 1, it is characterized in that: described Gauss matched filtering device is five rank Gaussian radio-frequency filters, and bandwidth is 30MHz.
3. one kind is used the as claimed in claim 1 external active calibration device of distributed reception machine, comprise answer signal simulator, 1:n power splitter, a n distributed reception machine and n signal processor, AC pattern and S pattern answer signal that the answer signal simulator links to each other with the 1:n power splitter and produces with transmission, the input end of 1:n power splitter and n distributed reception machine links to each other and answer signal is divided into the n road is transferred to respectively each distributed reception machine, the output terminal of n distributed reception machine links to each other with corresponding signal processor respectively, n 〉=2 and be integer.
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| CN 201220549824 CN202837534U (en) | 2012-10-24 | 2012-10-24 | Distributed receiver and external active calibration device using same |
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| CN 201220549824 CN202837534U (en) | 2012-10-24 | 2012-10-24 | Distributed receiver and external active calibration device using same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199531A (en) * | 2016-06-27 | 2016-12-07 | 芜湖航飞科技股份有限公司 | A kind of airway traffic control radar secondary radar data control system |
| CN108120964A (en) * | 2017-11-22 | 2018-06-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The method that dynamic test secondary radar the machine delay data improves range accuracy |
| CN110611514A (en) * | 2019-09-20 | 2019-12-24 | 盛纬伦(深圳)通信技术有限公司 | Signal demodulation system, method and computer storage medium for distributed receiver |
| CN111740781A (en) * | 2020-05-26 | 2020-10-02 | 复旦大学 | A device and method for generating W-band vector QPSK millimeter wave signal |
-
2012
- 2012-10-24 CN CN 201220549824 patent/CN202837534U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199531A (en) * | 2016-06-27 | 2016-12-07 | 芜湖航飞科技股份有限公司 | A kind of airway traffic control radar secondary radar data control system |
| CN108120964A (en) * | 2017-11-22 | 2018-06-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The method that dynamic test secondary radar the machine delay data improves range accuracy |
| CN108120964B (en) * | 2017-11-22 | 2021-12-07 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for dynamically testing time delay data of secondary radar local machine to improve ranging precision |
| CN110611514A (en) * | 2019-09-20 | 2019-12-24 | 盛纬伦(深圳)通信技术有限公司 | Signal demodulation system, method and computer storage medium for distributed receiver |
| CN110611514B (en) * | 2019-09-20 | 2022-05-17 | 内蒙古信元网络安全技术股份有限公司 | Signal demodulation system, method and computer storage medium for distributed receiver |
| CN111740781A (en) * | 2020-05-26 | 2020-10-02 | 复旦大学 | A device and method for generating W-band vector QPSK millimeter wave signal |
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Granted publication date: 20130327 |
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