CN202815212U - Magnetron radar frequency tracking device - Google Patents
Magnetron radar frequency tracking device Download PDFInfo
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- CN202815212U CN202815212U CN 201220536308 CN201220536308U CN202815212U CN 202815212 U CN202815212 U CN 202815212U CN 201220536308 CN201220536308 CN 201220536308 CN 201220536308 U CN201220536308 U CN 201220536308U CN 202815212 U CN202815212 U CN 202815212U
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Abstract
The utility model discloses a magnetron radar frequency tracking device, comprising an amplifier, an intermediate frequency filtering circuit, an analog-digital converter, a band-pass filtering circuit, a power discriminating circuit, a frequency counting circuit, a frequency discriminating circuit and a frequency regulating circuit, wherein a signal input end of the amplifier inputs a sample intermediate frequency signal output by a transmitter, the amplifier, the intermediate frequency filtering circuit, the analog-digital converter, the band-pass filtering circuit, the power discriminating circuit, the frequency counting circuit, the frequency discriminating circuit and the frequency regulating circuit are sequentially connected in series, a signal output end of the frequency regulating circuit is connected with a signal input end of a local oscillation circuit, and a signal output end of the local oscillation circuit outputs a frequency regulating signal. According to the magnetron radar frequency tracking device, the digital processing method is adopted, the precision is higher, the stability is better, the device is not easily affected by environmental factors, and the system stability and anti-interference capability are improved; moreover, the two-stage filtering method is utilized, the tracking time is effectively shortened, the precision and real-time performance of the intermediate frequency signal are improved, and the cost is reduced.
Description
Technical field
The utility model relates to a kind of magnetron radar frequency tracking means for non-coherent radar, relates in particular to a kind of magnetron radar frequency tracking means that adopts the digitized processing mode.
Background technology
Non-coherent radar has the advantages such as cost is low, easy debugging, and the application of non-coherent radar is comparatively extensive.The intermediate-freuqncy signal that accurate frequency-tracking control can provide more stable in non-coherent radar, precision is higher, thus the velocity field information of objective body obtained.The tracking accuracy of frequency-tracking device and response time are the key factors of the non-coherent radar intermediate-frequency receiver performance of impact.
Existing radar frequency tracking means adopts magnetron self-frequency control system to realize stablizing intermediate frequency more, comprise search/tracking converter, amplifier, wave filter, local oscillation circuit and tuning motor etc., when intermediate frequency signal frequency and centre frequency differ greatly, system is in the frequency sweep search condition, search/tracking converter produces periodic sawtooth voltage, magnetron frequency is changed continuously, until near specified intermediate frequency, convert the frequency-tracking state to from low to high.When being in the frequency-tracking state, frequency discriminator departs from direction and the size of specified intermediate frequency according to difference frequency, output pulse train signal removes to control tuning motor, thereby makes the differential of magnetron frequency and stable local frequency be bordering on specified intermediate frequency after amplifying peak detection.
The shortcoming of existing radar frequency tracking means is: module is many, poor stability, debugging difficulty are large; Low precision can not provide an accurate intermediate-freuqncy signal; Frequency-tracking has delay, and real-time is poor; Cost is higher.
Summary of the invention
The purpose of this utility model provides a kind of magnetron radar frequency tracking means that adopts the digitized processing mode with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
Magnetron radar frequency tracking means described in the utility model, the sample intermediate-freuqncy signal of its signal input part input transmitter output, its signal output part is connected with the signal input part of local oscillation circuit, the signal output part output frequency conditioning signal of described local oscillation circuit; Described magnetron radar frequency tracking means comprises amplifier, the intermediate frequency filtering circuit, analog to digital converter, bandwidth-limited circuit, the power judging circuit, frequency counting circuit, frequency judging circuit and frequency regulating circuit, the signal input part of described amplifier is the signal input part of described magnetron radar frequency tracking means, described amplifier, described intermediate frequency filtering circuit, described analog to digital converter, described bandwidth-limited circuit, described power judging circuit, described frequency counting circuit, described frequency judging circuit and described frequency regulating circuit are connected in series successively, and the signal output part of described frequency regulating circuit is the signal output part of described magnetron radar frequency tracking means.
In radar system, magnetron added high pressure makes it produce vibration, and most energy by being detected the object scattering, are delivered to receiver through antenna reception, i.e. echoed signal after the transmitter emission.Other has the small part energy to deliver to receiver in order to frequency-tracking through being coupled as the radio frequency sample, and this radio frequency sample and local oscillator mixing obtain the sample intermediate frequency.Because magnetron has very strong frequency with temperature drift characteristic, thereby make the also thereupon drift of sample IF-FRE, produce corresponding frequency to offset this drift value, to reach the purpose of stablizing intermediate frequency so adopt magnetron radar frequency tracking means described in the utility model sample frequency to be followed the tracks of and controlled local oscillator.
In the utility model, at first the sample intermediate-freuqncy signal is amplified, and the filtering radio-frequency component; Then carry out the high-speed, high precision sampling, obtain digital quantity and send into bandwidth-limited circuit, carry out digital band pass filtering to remove the impact of interference noise, then carrying out power differentiates, Intelligent Recognition goes out position and the sample pulsewidth that the sample power maximum point occurs, and in conjunction with sampling rate sample signal is added up again, obtains real-time transmission frequency, carry out frequency according to the local oscillator characteristic at last and differentiate the generation adjustment amount, thereby adjust the purpose that local frequency reaches frequency-tracking in the mode of numeral.
As preferably, described bandwidth-limited circuit, described power judging circuit, described frequency counting circuit, described frequency judging circuit and described frequency regulating circuit all adopt field programmable gate array as CPU.
Particularly, described amplifier employing model is the chip of HMC478; Described analog to digital converter adopts the AD6645 chip of ADI company.
The beneficial effects of the utility model are:
The utility model adopts the digitized processing mode, and its precision is higher, stability is better, is not subject to such environmental effects, has improved system stability and antijamming capability; Utilize the two stage filter mode, effectively shortened tracking time, improve precision and the real-time of intermediate-freuqncy signal, reduced cost; Adopt high-speed AD converter and field programmable gate array, make that the dirigibility of magnetron radar frequency tracking means is higher, extendability is stronger, cost is lower.Generally speaking, the utlity model has that module is few, good stability, debugging is easy, precision is high, frequency-tracking is punctual, real-time, advantage that cost is low.
Description of drawings
Fig. 1 is the circuit structure block diagram of magnetron radar frequency tracking means described in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, magnetron radar frequency tracking means described in the utility model, comprise amplifier, the intermediate frequency filtering circuit, analog to digital converter ADC, bandwidth-limited circuit, the power judging circuit, frequency counting circuit, frequency judging circuit and frequency regulating circuit (i.e. the interior part of dotted line frame among the figure), the sample intermediate-freuqncy signal of the signal input part input transmitter output of amplifier, amplifier, intermediate frequency filtering circuit ADC, analog to digital converter, bandwidth-limited circuit, the power judging circuit, frequency counting circuit, frequency judging circuit and frequency regulating circuit are connected in series successively, the signal output part of frequency regulating circuit is connected with the signal input part of local oscillation circuit, the signal output part output frequency conditioning signal of local oscillation circuit.Wherein, bandwidth-limited circuit, power judging circuit, frequency counting circuit, frequency judging circuit and frequency regulating circuit all adopt field programmable gate array as CPU.
In the said structure, the principle of work of each circuit is as follows:
1, amplifier: because the transmitter coupled power is less, in order to obtain better signal to noise ratio (S/N ratio), need the sample intermediate-freuqncy signal is amplified, enlargement factor 20dB adopts single-chip HMC478 to realize, this chip is typical gains 22dB in DC～1GHz scope, the 5V single power supply, peak power output+18dBm, 50 ohm of input impedance, peripheral circuit is simple, is very suitable for the amplification to intermediate-freuqncy signal.
2, intermediate frequency filtering circuit: can introduce radio-frequency component after radio frequency sample and the local oscillator mixing, easily identification brings error to back end signal after intermediate frequency amplifies, so need carry out the intermediate frequency analog filtering, extracts the frequency content that needs, and reduces system interference.This wave filter adopts LC low-pass filter, bandwidth 60MHz, Out-of-band rejection-60dB.
3, intermediate frequency filtering circuit ADC:ADC selects the AD6645 of ADI company, sampling precision 14bit, and maximum sampling rate 105MSPS, its Spurious Free Dynamic Range SFDR representative value is 89dBc, the input bandwidth can reach 200MHz, maximum unsaturated level+6dBm.This device sampling rate is 80MHz, and the frequency 30MHz of center of a sample adopts oversampling technique, can complete reservation be sampled all information of signal, so that follow-up signal is processed and recognition and tracking.
4, bandwidth-limited circuit: the bandpass filter Main Function based on FPGA is signal screening, its centre frequency 30MHz, and bandwidth BW is 8MHz, Out-of-band rejection 60dB adopts 40 rank FIR to realize.Only have the sample IF-FRE of working as to fall in this filter transmission band scope, just carry out follow-up power differentiation and frequency identification and process, carry out the frequency fine tuning to calculate accurately sample frequency; Otherwise, directly control local oscillator and carry out the frequency hopping tracking, improve tracking velocity.
5, power judging circuit: this module is at first carried out buffer memory to sample signal, under the system synchronization signal function, adopt method of successive comparison to find out the Sample Maximal power points, in conjunction with radar system pulse width discrimination principle, getting amplitude each 50% place about maximum power point is border, the transponder pulse left and right sides, as the Data Source of frequency counting module.
6, frequency counting circuit: after obtaining the transponder pulse left and right boundary point, at first statistics falls into the sampling number of this scope, counts sample cycle's number according to signal amplitude again, calculates emission sample IF-FRE in conjunction with the ADC sample frequency at last, and its computing formula is:
f
IF=N (f
sX τ), f wherein
IFBe the sample IF-FRE, N is sample cycle's number, f
sBe sample frequency, τ is the emission pulsewidth.
7, frequency judging circuit: the radar mean frequency bandwidth is 4MHz under this device, causes signal to be in outside the band for fear of the IF-FRE drift, must be at | f
IF| 〉=| f
cCarry out frequency adjustment, wherein f during ± 2MHz|
IFBe sample IF-FRE, f
cBe the radar mean frequency centre frequency.
8, frequency regulating circuit: when frequency differentiation result indicates needs to adjust local frequency, buffer memory adjusted value at first, when arriving, preamble pulse to be launched just sends the adjustment instruction, process through adjusting with the sample of guaranteeing to gather next time, thereby guarantee system synchronization, prevent that collecting sample causes data to process mistake in the adjustment process.
The key technical indexes is as follows:
(1) intermediate frequency gain amplifier: 40dB;
(2) the frequency rough pacing is advanced: 4MHz;
(3) frequency fine tuning precision: 100KHz;
(4) frequency is adjusted time :≤100ns.
Claims (4)
1. magnetron radar frequency tracking means, the sample intermediate-freuqncy signal of its signal input part input transmitter output, its signal output part is connected with the signal input part of local oscillation circuit, the signal output part output frequency conditioning signal of described local oscillation circuit; It is characterized in that: comprise amplifier, the intermediate frequency filtering circuit, analog to digital converter, bandwidth-limited circuit, the power judging circuit, frequency counting circuit, frequency judging circuit and frequency regulating circuit, the signal input part of described amplifier is the signal input part of described magnetron radar frequency tracking means, described amplifier, described intermediate frequency filtering circuit, described analog to digital converter, described bandwidth-limited circuit, described power judging circuit, described frequency counting circuit, described frequency judging circuit and described frequency regulating circuit are connected in series successively, and the signal output part of described frequency regulating circuit is the signal output part of described magnetron radar frequency tracking means.
2. magnetron radar frequency tracking means according to claim 1, it is characterized in that: described bandwidth-limited circuit, described power judging circuit, described frequency counting circuit, described frequency judging circuit and described frequency regulating circuit all adopt field programmable gate array as CPU.
3. magnetron radar frequency tracking means according to claim 1 is characterized in that: it is the chip of HMC478 that described amplifier adopts model.
4. magnetron radar frequency tracking means according to claim 1 is characterized in that: described analog to digital converter adopts the AD6645 chip of ADI company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220536308 CN202815212U (en) | 2012-10-19 | 2012-10-19 | Magnetron radar frequency tracking device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220536308 CN202815212U (en) | 2012-10-19 | 2012-10-19 | Magnetron radar frequency tracking device |
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| CN202815212U true CN202815212U (en) | 2013-03-20 |
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| CN 201220536308 Expired - Fee Related CN202815212U (en) | 2012-10-19 | 2012-10-19 | Magnetron radar frequency tracking device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116386A (en) * | 2015-09-11 | 2015-12-02 | 上海广电通信技术有限公司 | Adaptive maximum intermediate frequency energy tracking radar receiving system |
| CN106680781A (en) * | 2016-01-15 | 2017-05-17 | 上海圆舟电子科技有限公司 | Digital tuning method, system and device for radar receiver front-end |
| CN106772297A (en) * | 2017-01-23 | 2017-05-31 | 上海广电通信技术有限公司 | Radar transmission power is measured and automatic frequency tracking system |
| CN109782076A (en) * | 2018-12-28 | 2019-05-21 | 北京航天测控技术有限公司 | A kind of IF signal frequency test method for microwave communication equipment |
| CN114779179A (en) * | 2022-06-20 | 2022-07-22 | 成都远望探测技术有限公司 | Anti-saturation receiving circuit based on meteorological radar |
-
2012
- 2012-10-19 CN CN 201220536308 patent/CN202815212U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116386A (en) * | 2015-09-11 | 2015-12-02 | 上海广电通信技术有限公司 | Adaptive maximum intermediate frequency energy tracking radar receiving system |
| CN105116386B (en) * | 2015-09-11 | 2017-05-24 | 上海广电通信技术有限公司 | Adaptive maximum intermediate frequency energy tracking radar receiving system |
| CN106680781A (en) * | 2016-01-15 | 2017-05-17 | 上海圆舟电子科技有限公司 | Digital tuning method, system and device for radar receiver front-end |
| CN106772297A (en) * | 2017-01-23 | 2017-05-31 | 上海广电通信技术有限公司 | Radar transmission power is measured and automatic frequency tracking system |
| CN106772297B (en) * | 2017-01-23 | 2023-03-28 | 上海广电通信技术有限公司 | Radar emission power measurement and frequency automatic tracking system |
| CN109782076A (en) * | 2018-12-28 | 2019-05-21 | 北京航天测控技术有限公司 | A kind of IF signal frequency test method for microwave communication equipment |
| CN114779179A (en) * | 2022-06-20 | 2022-07-22 | 成都远望探测技术有限公司 | Anti-saturation receiving circuit based on meteorological radar |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20161019 |