CN104597441A - Weak spread spectrum signal angle tracking method and system - Google Patents
Weak spread spectrum signal angle tracking method and system Download PDFInfo
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- CN104597441A CN104597441A CN201510010646.2A CN201510010646A CN104597441A CN 104597441 A CN104597441 A CN 104597441A CN 201510010646 A CN201510010646 A CN 201510010646A CN 104597441 A CN104597441 A CN 104597441A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/66—Radar-tracking systems; Analogous systems
- G01S13/68—Radar-tracking systems; Analogous systems for angle tracking only
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Abstract
The invention discloses a weak spread spectrum signal angle tracking method and system and relates to the aircraft hidden measuring angle tracking of the wireless measurement and control field. The method and system break through the parallel fast acquisition and high precision related demodulation problems and develop the weak spread spectrum signal angle tracking technology for realizing the weak spread spectrum signal high precision angle tracking. The method and the system take full advantage of the existing measurement and control channel, and the additional device is not required, the tracking system sensitivity is high, the tracking precision is high, the algorithm is simple and the device is simple. The method and system are very suitable for hidden measuring angle tracking for the aircraft in the aircraft measurement and control system.
Description
Technical field
The present invention relates to a kind of Spread Spectrum Faintness Signal angle tracking in radio measurement and control field technology, be particularly suitable for the hidden Angle tracking of radio measurement and control field to aircraft.
Background technology
In radio measurement and control field, mainly adopt single channel and single pulse system to the tracking of aircraft at present, downlink data adopts the Quadrature Phase Shift Keying modulation system of non-spread spectrum, and signal is easy to be intercepted and captured and disturb.Under spread spectrum system can be operated in negative signal to noise ratio (S/N ratio), signal is submerged in noise, therefore has the ability of very high disguise, anti-interference, anti-multipath and Anti TBIgG.And how directly to utilize spread spectrum information to realize the extraction of angular error signal, complete the Angle tracking to airbound target accurately and timely, become the problem that measurement and control system of aircraft must solve.
Summary of the invention
Present invention, avoiding the weak point in above-mentioned background technology, under making again tracker can be operated in negative signal to noise ratio (S/N ratio) simultaneously, and current observing and controlling channel can be made full use of and without the need to additionally increasing equipment amount, there is the features such as algorithm is simple, highly sensitive, precision is high, equipment is simple.
Technical matters to be solved by this invention is realized by following technical scheme:
A kind of Spread Spectrum Faintness Signal angle tracking method, is characterized in that, comprise the following steps:
1. the synthesis of single channel monopulse faint spread spectrum angle tracking radiofrequency signal:
The angular error signal Δ A export ground tracking antenna sum-difference network and Δ E carries out 0/ π modulation with low-frequency square-wave orthogonal each other respectively, be coupled again with signal Σ after the signal plus of two-way modulation, synthesize single channel monopulse faint spread spectrum angle tracking radiofrequency signal;
2. the Spread Spectrum Faintness Signal of ground digital track receiver to input realizes quick despreading:
Ground digital track receiver adopts the mode of pseudo-code phase parallel search to the intermediate frequency Spread Spectrum Faintness Signal of input, significantly reduce the processing time of despreading search phase, simultaneously in order to despreading can be completed under the condition of low signal-to-noise ratio, adopt many times of video accumulations, the quick despreading under Spread Spectrum Faintness Signal condition can be realized, to adapt to quick, the Larger Dynamic to aircraft, disguised angle tracking;
3. ground digital track receiver is to the signal after despreading by computing, calculates error voltage and outputs to servosystem, realizing Closed loop track:
Ground digital track receiver is to the data after despreading, and by computing, bandpass filtering, with local low-frequency square-wave synchronous detection, low-pass filtering, calculate error voltage, framing exports to servosystem, completes the Closed loop track to aircraft.
A kind of system implementing described Spread Spectrum Faintness Signal angle tracking method, it is characterized in that, comprise coupling mechanism, radio frequency band filter, low noise amplifier LNA, local oscillator, low-converter, if bandpas filter, the quick despreader of pseudo-code, first multiplier, second multiplier, one 0/ π modulator, 2 0/ π modulator, totalizer, automatic growth control AGC, intermediate frequency amplifier, T/4 phase shifter and low-frequency square-wave generator, what Deep space tracking antenna exported passes through coupling mechanism successively with signal Σ, radio frequency band filter, low noise amplifier LNA, low-converter, after if bandpas filter, the input end of despreader quick with pseudo-code is connected, two output terminals of the quick despreader of pseudo-code are connected with an input end of a multiplier respectively, between low noise amplifier LNA and low-converter, be also connected with local oscillator, another input end of if bandpas filter is also connected with the output terminal of intermediate frequency amplifier, and this intermediate frequency amplifier is provided with automative interest increasing controlling circuit AGC, the input end of the one 0/ π modulator is connected with the output terminal of bearing signal Δ A and T/4 phase shifter respectively with modulated terminal, and the input end of the latter is connected with the output terminal of low-frequency square-wave generator, the input end of the 2 0/ π modulator is connected with the output terminal of pitch error signal delta E and low-frequency square-wave generator respectively with modulated terminal, one 0/ π modulator is connected with another input end of coupling mechanism after totalizer with the output terminal of the 2 0/ π modulator, another input end of multiplier described in two is connected with the output terminal of T/4 phase shifter and low-frequency square-wave generator respectively.
The present invention's tool compared with background technology has the following advantages:
1. the present invention make use of the existing channel equipment of current TT&C system greatly, does not almost have anything to change when single channel monopulse signal syntheses, and to turn avoid in original tracking system disguised poor simultaneously, easily disturbed shortcoming.
2. signal processing of the present invention, digital despreading have employed parallel search and the many times of video accumulation strategies of pseudo-code, namely maintains the sensitivity index of original despreading, shortens again the time of despreading locking.The part of resolving of error voltage is united with despreading algorithm simultaneously, the original ripe algorithm of inherit and development.
3. core of the present invention is mainly in digital signal processing, and the hardware platform of signal transacting uses original hardware resource, and the algorithm realization adopted is flexible, simple, dependable performance, is conducive to engineer applied.
Accompanying drawing explanation
Fig. 1 is the present invention's faint spread spectrum angle tracking system composition frame chart.
Fig. 2 is that pseudo-code parallel search of the present invention catches theory diagram.
In Fig. 1: Σ be Deep space tracking antenna export be respectively orientation with signal, Δ A and Δ E and pitch error signal, LNA be LNA, AGC is automatic growth control, UA and UE is respectively the angle error voltage that ground digital track receiver resolves output.
In Fig. 2: I and Q is aligning branch data, PN0 after the despreading of ground digital track receiver ... PNn is the out of phase of pseudo-code.
Embodiment
See Fig. 1, a kind of Spread Spectrum Faintness Signal angle tracking system of the present invention, comprise coupling mechanism 1, radio frequency band filter 2, low noise amplifier LNA, local oscillator 3, low-converter 4, if bandpas filter 5, the quick despreader 6 of pseudo-code, first multiplier 7, second multiplier 8, one 0/ π modulator 9, 2 0/ π modulator 10, totalizer 11, automatic growth control AGC, intermediate frequency amplifier 12, T/4 phase shifter 13 and low-frequency square-wave generator 14, what Deep space tracking antenna exported passes through coupling mechanism 1 successively with signal Σ, radio frequency band filter 2, low noise amplifier LNA, low-converter 4, be connected with the input end of the quick despreader 6 of pseudo-code after if bandpas filter 5, two output terminals of the quick despreader 6 of pseudo-code are connected with an input end of a multiplier respectively, between low noise amplifier LNA and low-converter 4, be also connected with local oscillator 3, another input end of if bandpas filter 5 is also connected with the output terminal of intermediate frequency amplifier 12, and this intermediate frequency amplifier 12 is provided with automative interest increasing controlling circuit AGC, the input end of the one 0/ π modulator 9 is connected with the output terminal of bearing signal Δ A and T/4 phase shifter 13 respectively with modulated terminal, and the input end of the latter is connected with the output terminal of low-frequency square-wave generator 14, the input end of the 2 0/ π modulator 10 is connected with the output terminal of pitch error signal delta E and low-frequency square-wave generator 14 respectively with modulated terminal, one 0/ π modulator 9 is connected with another input end of coupling mechanism 1 after totalizer 11 with the output terminal of the 2 0/ π modulator 10, another input end of multiplier described in two is connected with the output terminal of T/4 phase shifter 13 and low-frequency square-wave generator 14 respectively.
See Fig. 1 and Fig. 2, a kind of Spread Spectrum Faintness Signal angle tracking of the present invention method, comprises the following steps:
1. the low-frequency square-wave signal of pair of orthogonal that the azimuth error signal Δ A that exports of the sum-difference network of Deep space tracking directional antenna and pitch error signal delta E exports with the low-frequency square-wave generator 14 of ground digital track receiver respectively completes 0/ π and modulates in two 0/ π modulators 9 and 10, error voltage after modulation is by after totalizer 11, export with the sum-difference network by Deep space tracking directional antenna in coupling mechanism 1 be coupled to signal Σ together with, through the filtering of radio frequency band filter 2, after the amplification of LNA, intermediate-freuqncy signal is obtained after local oscillator 3 with low-converter 4 mixing, then 12 amplifications are put in passing through, after if bandpas filter 5 filtering, this intermediate-freuqncy signal is outputted to the input end of the quick despreader 6 of pseudo-code of ground digital track receiver.
2. the Spread Spectrum Faintness Signal of ground digital track receiver to input carries out quick despreading.
For traditional despreading system, the time delay of despreading process is mainly in the code acquisition stage of pseudo-code, and in order to reduce the time delay of despreading, the quick despreader 6 of pseudo-code of the present invention adopts the mode of n road pseudo-code phase parallel search.Pseudo-code part parallel code acquisition principle as shown in Figure 2.For the pseudo-random code of 256, consider saving hardware resource, parallel branch n gets 8, and the phase place of 8 branch roads is respectively PN0, PN1 ... PN7; PN8, PN9 ... PN15; PN248, PN249 ... PN255.Walking abreast by 8 branch road pseudo-code phase, the time shared by the search phase is 1/8 of phase bit serial slip, can meet current design requirement.
Under low signal-to-noise ratio, despreading can be completed rapidly and accurately to make system.Except adopting the mode of pseudo-code phase parallel search in the search phase, for the vision signal of search phase, also use the energy accumulation of many times.Consider the lifting of performance and the consumption of hardware resource, select the video of 8 times to accumulate.Like this, tracker is made can to complete accurately catching and following the tracks of airbound target when feeble signal.
3. ground digital track receiver calculates error voltage to the feeble signal after completing quick despreading by amplitude detection algorithm and outputs to servosystem, completes Closed loop track.
Ground digital track receiver is to the data after despreading, adopt amplitude detection algorithm, cancellation remains the impact of frequency difference Angle Error signal, then integration extraction, bandpass filtering, in multiplier 7 and multiplier 8, complete synchronous detection with the orthogonal low frequency signal of two-way that low-frequency square-wave generator 14 exports, calculate azimuth angle error voltage and angle of pitch error voltage respectively, export to servosystem, complete the Closed loop track to aircraft.
Claims (2)
1. a Spread Spectrum Faintness Signal angle tracking method, is characterized in that, comprises the following steps:
1. the synthesis of single channel monopulse faint spread spectrum angle tracking radiofrequency signal:
The angular error signal Δ A export ground tracking antenna sum-difference network and Δ E carries out 0/ π modulation with low-frequency square-wave orthogonal each other respectively, be coupled again with signal Σ after the signal plus of two-way modulation, synthesize single channel monopulse faint spread spectrum angle tracking radiofrequency signal;
2. the Spread Spectrum Faintness Signal of ground digital track receiver to input realizes quick despreading:
Ground digital track receiver adopts the mode of pseudo-code phase parallel search to the intermediate frequency Spread Spectrum Faintness Signal of input, significantly reduce the processing time of despreading search phase, simultaneously in order to despreading can be completed under the condition of low signal-to-noise ratio, adopt many times of video accumulations, the quick despreading under Spread Spectrum Faintness Signal condition can be realized, to adapt to quick, the Larger Dynamic to aircraft, disguised angle tracking;
3. ground digital track receiver is to the signal after despreading by computing, calculates error voltage and outputs to servosystem, realizing Closed loop track:
Ground digital track receiver is to the data after despreading, and by computing, bandpass filtering, with local low-frequency square-wave synchronous detection, low-pass filtering, calculate error voltage, framing exports to servosystem, completes the Closed loop track to aircraft.
2. one kind implements the claims the system of the Spread Spectrum Faintness Signal angle tracking method described in 1, it is characterized in that, comprise coupling mechanism 1, radio frequency band filter 2, low noise amplifier LNA, local oscillator 3, low-converter 4, if bandpas filter 5, the quick despreader 6 of pseudo-code, first multiplier 7, second multiplier 8, one 0/ π modulator 9, 2 0/ π modulator 10, totalizer 11, automatic growth control AGC, intermediate frequency amplifier 12, T/4 phase shifter 13 and low-frequency square-wave generator 14, what Deep space tracking antenna exported passes through coupling mechanism 1 successively with signal Σ, radio frequency band filter 2, low noise amplifier LNA, low-converter 4, be connected with the input end of the quick despreader 6 of pseudo-code after if bandpas filter 5, two output terminals of the quick despreader 6 of pseudo-code are connected with an input end of a multiplier respectively, between low noise amplifier LNA and low-converter 4, be also connected with local oscillator 3, another input end of if bandpas filter 5 is also connected with the output terminal of intermediate frequency amplifier 12, and this intermediate frequency amplifier 12 is provided with automative interest increasing controlling circuit AGC, the input end of the one 0/ π modulator 9 is connected with the output terminal of bearing signal Δ A and T/4 phase shifter 13 respectively with modulated terminal, and the input end of the latter is connected with the output terminal of low-frequency square-wave generator 14, the input end of the 2 0/ π modulator 10 is connected with the output terminal of pitch error signal delta E and low-frequency square-wave generator 14 respectively with modulated terminal, one 0/ π modulator 9 is connected with another input end of coupling mechanism 1 after totalizer 11 with the output terminal of the 2 0/ π modulator 10, another input end of multiplier described in two is connected with the output terminal of T/4 phase shifter 13 and low-frequency square-wave generator 14 respectively.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443677A (en) * | 2016-09-28 | 2017-02-22 | 西安思丹德信息技术有限公司 | Frequency-hopping spread spectrum communication system pseudo code ranging and angle measurement method |
| CN106772356A (en) * | 2017-01-05 | 2017-05-31 | 西安电子科技大学 | The spread spectrum angle tracking signal acquisition methods of single channel monopulse system |
| CN106789796A (en) * | 2016-12-15 | 2017-05-31 | 中国电子科技集团公司第二十研究所 | A kind of 0/ π modulation angle-measuring methods based on orthogonal digital envelope detection |
| CN110048730A (en) * | 2019-03-29 | 2019-07-23 | 西安空间无线电技术研究所 | A kind of track receiver channel of two kinds of tracking systems of compatibility |
-
2015
- 2015-01-09 CN CN201510010646.2A patent/CN104597441A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 赵呈哲 等: "无人飞行器扩频角跟踪技术研究与应用", 《无线电工程-测控遥感与导航定位》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443677A (en) * | 2016-09-28 | 2017-02-22 | 西安思丹德信息技术有限公司 | Frequency-hopping spread spectrum communication system pseudo code ranging and angle measurement method |
| CN106789796A (en) * | 2016-12-15 | 2017-05-31 | 中国电子科技集团公司第二十研究所 | A kind of 0/ π modulation angle-measuring methods based on orthogonal digital envelope detection |
| CN106789796B (en) * | 2016-12-15 | 2019-10-22 | 中国电子科技集团公司第二十研究所 | A kind of 0/ π modulation angle-measuring method based on orthogonal digital envelope detection |
| CN106772356A (en) * | 2017-01-05 | 2017-05-31 | 西安电子科技大学 | The spread spectrum angle tracking signal acquisition methods of single channel monopulse system |
| CN110048730A (en) * | 2019-03-29 | 2019-07-23 | 西安空间无线电技术研究所 | A kind of track receiver channel of two kinds of tracking systems of compatibility |
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Application publication date: 20150506 |