CN106569235B - The design method of L-band SAR satellite navigation receiver Cochannel interference - Google Patents
The design method of L-band SAR satellite navigation receiver Cochannel interference Download PDFInfo
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- CN106569235B CN106569235B CN201611019635.1A CN201611019635A CN106569235B CN 106569235 B CN106569235 B CN 106569235B CN 201611019635 A CN201611019635 A CN 201611019635A CN 106569235 B CN106569235 B CN 106569235B
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- sar
- microwave switch
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention provides a kind of design methods of L-band SAR satellite navigation receiver Cochannel interference, it inhibits co-channel interference by increasing the microwave switch of an electronics with SAR pulse signal linkage work in navigation neceiver, the microwave switch is mainly used for separating the co-channel interference signal that the SAR load that pulse power is more than one kilowatt is generated in navigation neceiver frequency point, the on-off of the microwave switch is all controlled by the timing signal that SAR subsystem generates, emit relative to SAR subsystem, received PRF signal, the timing signal is broadened, the microwave switch is integrated to be built in navigation neceiver.The present invention fundamentally solves the problem of co-channel interference of L-band SAR satellite SAR load and Global Satellite Navigation System, so that the design of SAR load is freer, while ensuring navigation accuracy, post-processing is relatively more simple.
Description
Technical field
The present invention relates to aerospace vehicle fields, and in particular, to a kind of L-band SAR satellite navigation receiver is anti-with frequency
The design method of interference.
Background technique
Frequency selection purposes are a key parameters of SAR (synthetic aperture radar) design of satellites, it is contemplated that atmosphere electromagnetic transmission
Effect, SAR satellite mainly uses five kinds of frequency ranges of L, S, C, X, Ku both at home and abroad at present.Wherein, since L frequency range is relative to other four kinds
Frequency range has smaller time, space removal correlation effect to promote processing accuracy to guarantee the correlation of interference image, so that
Preferred frequency range of the L frequency range as the SAR Satellites system for carrying out hypsographic survey, difference distortion measurement application demand.
But unfortunately, provide only have according to International Telecommunication Association in the frequency range that L frequency range is allocated to satellite active detection
85MHz between 1215-1300MHz, the frequency range have also been allocated to satellite radionavigation simultaneously, and wherein (whole world is fixed by GPS
Position system) working frequency points be L1 (1575.42MHz), L2 (1227.60MHz), signal bandwidth be 2MHz (C/A code)/20MHz
Three working frequency points of (P code), BD2 (No. two satellite navigation systems of Beidou) are respectively B1 (1561.09MHz), B2
(1207.14MHz), B3 (1268.00MHz), and according to the regulation according to International Telecommunication Association's radio regulation(s) footnote 5.332,
1215-1300MHz frequency range, the active load of earth exploration-satellite should not to radio-positioning, satellite radionavigation and its
He mainly divides business and generates harmful interference, must not also propose the requirement sought protection, this makes the spaceborne L wave of high power transmission
Section SAR satellite and the highly sensitive received navigation neceiver working band being loaded on star are close or even Chong Die, exist dry with frequency
Disturb possibility.
The magnitude of interference is to study the premise of this co-channel interference, with typical SAR load parameter, antenna parameter, layout relationship
Analytical calculation, L-band SAR load are -10dBm~0dBm magnitude to the co-channel interference magnitude representative value of navigation neceiver, this is dry
Disturb power level be although unlikely to burn the low-noise amplifier of navigation neceiver front end (through consulting, typical damage level is+
15dBm magnitude), but considerably beyond the saturation level of low-noise amplifier (representative value is -43dBm), it inevitably results in
Receive the loss of carrier-to-noise ratio.
Using centre frequency 1.3GHz, bandwidth 85MHz, duty ratio 16% as SAR interference signal parameters, pass through physical varification
It was found that the critical level that GPS-L1 (the L1 frequency point of global positioning system) is disturbed is about -30dBm, GPS-L2 (global positioning system
The L2 frequency point of system) critical level that is disturbed is about -60dBm, it is seen then that if interference signal of leaving enters navigation receiving channel,
The performance of receiver will decline to a great extent, or even cannot work.
In order to avoid such co-channel interference, there are two common practices: one, in advance will navigation before SAR high power work
Receiver shutdown, be switched on work again after the completion of SAR work；Two, navigation neceiver normal boot-strap during SAR high power work,
Navigation data during SAR is switched on when off-line data processing gives rejecting processing.Two measures do not solve fundamentally
Problem of co-channel interference, while also bringing system to design, difficulty additional in post-processing.
Summary of the invention
For the defects in the prior art, it is anti-same that the object of the present invention is to provide a kind of L-band SAR satellite navigation receivers
The design method of frequency interference, fundamentally solves the same frequency of L-band SAR satellite SAR load and Global Satellite Navigation System
Interference problem so that the design of SAR load is freer, while ensuring navigation accuracy, and post-processing is relatively more simple.
According to an aspect of the present invention, a kind of design side of L-band SAR satellite navigation receiver Cochannel interference is provided
Method, which is characterized in that its microwave switch by increasing an electronics with SAR pulse signal linkage work in navigation neceiver
To inhibit co-channel interference.
Preferably, the microwave switch is mainly used for separating pulse power being more than one kilowatt of SAR load in navigation reception
The co-channel interference signal that machine frequency point generates.
Preferably, the on-off of the microwave switch is all controlled by the timing signal that SAR subsystem generates, relative to
The transmitting of SAR subsystem, received PRF signal, the timing signal are broadened.
Preferably, the microwave switch is integrated is built in navigation neceiver.
Preferably, the timer module is located in SAR subsystem, and a navigation antenna is connected with navigation neceiver, fixed
When signal and the transmitting of control SAR subsystem, received PRF signal there is fixed relationship, it is fixed when SAR subsystem emits work
When signal control microwave switch shutdown, SAR subsystem receive work when, timing signal control microwave switch connect, in this way navigation
The co-channel interference signal that antenna receives SAR subsystem is just effectively isolated at microwave switch.
Compared with prior art, the present invention is with following the utility model has the advantages that the present invention fundamentally solves L-band SAR
The problem of co-channel interference of satellite SAR load and Global Satellite Navigation System, so that the design of SAR load is freer, including hair
Penetrating power, available machine time, frequency selection can carry out design according to mission requirements；It ensures navigation accuracy, is analyzed and tested,
After microwave switch interference protection measure is added, navigation signal snr loss is smaller, can ignore on navigation accuracy influence；Subsequent place
Reason is relatively more simple, and navigation neceiver is turned off during being switched on SAR, does not take other design sides such as any interference protection measure
Method, the navigate raw data quality obtained using design method of the present invention is higher, and data are more continuous, is conducive at subsequent orbit determination
Reason.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the realization principle figure of the design method of L-band SAR satellite navigation receiver Cochannel interference of the present invention.
Fig. 2 is the timing signal of present invention control microwave switch on-off and the timing diagram of PRF signal.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As shown in Figure 1, the design method of L-band SAR satellite navigation receiver Cochannel interference of the present invention is by navigating
Receiver 3 increases the microwave switch 4 of an electronics with SAR (synthetic aperture radar) pulse signal linkage work to inhibit with frequency
Interference.
The microwave switch 4 is mainly used for separating pulse power being more than one kilowatt of SAR load in 3 frequency point of navigation neceiver
The co-channel interference signal of generation.
The on-off of the microwave switch 4 is all controlled by the timing signal that SAR subsystem 1 generates, and is relative to SAR points
1 transmitting of system, received PRF (pulse recurrence frequency) signal, the timing signal are broadened, and microwave switch 4 has certain
Response time enters receiving channel to fundamentally prevent PRF signal, the control microwave switch 4 that timer module 2 is generated
Timing signal carry out broadening appropriate relative to PRF signal, it is however generally that, the broadening of 1 μ s can be met the requirements.
The microwave switch 4 is integrated to be built in navigation neceiver 3, and increased microwave switch 4 is integrated in chip form
In navigation neceiver 3, specifically it is placed in front of complete machine front-end low noise amplifier and is also located in each channel front-end low noise amplification
It can be determined according to actual task demand before device.
Timer module 2 is located in SAR subsystem 1, and a navigation antenna 5 is connected with navigation neceiver 3, microwave switch 4
On-off all controlled by the timer module 2 in SAR subsystem 1, timer module 2 generates a path timing signal and send to microwave and opens
4 are closed, timing signal and the transmitting of control SAR subsystem 1, received PRF signal have fixed relationship, and SAR subsystem 1 emits work
When making, timing signal controls microwave switch 4 and turns off, and when SAR subsystem 1 receives work, timing signal control microwave switch 4 is connect
Logical, the co-channel interference signal that such navigation antenna 5 receives SAR subsystem 1 is just effectively isolated at microwave switch 4.
To the control signal of microwave switch 4 directly by SAR subsystem 1 for controlling determining for 5 pulsed operation of navigation antenna
When device module 2 directly generate, i.e., timer module 2 generates the timing letter such as the control transmitting of SAR subsystem 1, received PRF normal
It is additional to generate timing signal homologous all the way on the basis of number, it is typically wire connected to the timing control interface of microwave switch 4, is needed
It is noted that the timing signal for also needing to control microwave switch is opposite if microwave switch is defaulted as high level connection
It carries out negating processing in PRF timing signal.
As shown in Fig. 2, Fig. 2 is that the present invention controls the timing signal of microwave switch on-off and the timing diagram of PRF signal,
In pulse width, the pulse ratio PRF signal of timing signal has broadened 1 μ s in rising edge and failing edge, to ensure that microwave is opened
Closing 4 has enough turn-off times when 1 signal of SAR subsystem emits, and is effectively isolated co-channel interference.
In conclusion the present invention fundamentally solves L-band SAR satellite SAR load and Global Satellite Navigation System
Problem of co-channel interference, so that the design of SAR load is freer, including transmission power, available machine time, frequency selection can be according to
Mission requirements carry out design；It ensures navigation accuracy, is analyzed and tested, after microwave switch interference protection measure is added, navigation letter
Number snr loss is smaller, can ignore on navigation accuracy influence；Post-processing is relatively more simple, closes with during SAR booting
Disconnected navigation neceiver, other design methods, the navigation obtained using design method of the present invention such as do not take any interference protection measure
Raw data quality is higher, and data are more continuous, is conducive to subsequent orbit determination processing.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (4)
1. a kind of design method of L-band SAR satellite navigation receiver Cochannel interference, which is characterized in that it is by navigating
Receiver increases the microwave switch of an electronics with SAR pulse signal linkage work to inhibit co-channel interference；
Microwave switch is also equipped with timer module, and the timer module is located in the SAR subsystem of setting, a navigation day
Line is connected with navigation neceiver, and timing signal and the transmitting of control SAR subsystem, received PRF signal have fixed relationship,
When SAR subsystem emits work, timing signal controls microwave switch shutdown, when SAR subsystem receives work, timing signal control
Microwave switch is connected, such navigation antenna receive the co-channel interference signal of SAR subsystem at microwave switch just by effectively every
From.
2. the design method of L-band SAR satellite navigation receiver Cochannel interference according to claim 1, feature exist
In the microwave switch is mainly used for the SAR load that partition pulse power is more than one kilowatt and generates in navigation neceiver frequency point
Co-channel interference signal.
3. according to claim 1 or the design side of L-band SAR satellite navigation receiver Cochannel interference as claimed in claim 2
Method, which is characterized in that the on-off of the microwave switch is all controlled by the timing signal that a SAR subsystem generates, relatively
In the transmitting of SAR subsystem, received PRF signal, the timing signal is broadened.
4. the design method of L-band SAR satellite navigation receiver Cochannel interference according to claim 1, feature exist
In the microwave switch is integrated to be built in navigation neceiver.
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| CN201611019635.1A CN106569235B (en) | 2016-11-17 | 2016-11-17 | The design method of L-band SAR satellite navigation receiver Cochannel interference |
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| CN201611019635.1A CN106569235B (en) | 2016-11-17 | 2016-11-17 | The design method of L-band SAR satellite navigation receiver Cochannel interference |
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| CN111025337A (en) * | 2019-12-12 | 2020-04-17 | 北京遥测技术研究所 | Co-channel interference elimination method suitable for high-precision satellite navigation equipment |
| CN113835092B (en) * | 2021-11-30 | 2022-03-04 | 湖南宜通华盛科技有限公司 | Phased array weather radar and self-adaptive frequency selection method and system thereof |
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| CN102955151B (en) * | 2012-10-09 | 2015-06-03 | 中国人民解放军63892部队 | Adaptive cross-polarization active jamming method and device |
| KR20140067780A (en) * | 2012-11-27 | 2014-06-05 | 삼성전자주식회사 | Method and apparatus for interference cancellation of mimo transmission in wireless communication system |
| CN104469084A (en) * | 2013-09-22 | 2015-03-25 | 何阳 | Device for eliminating same frequency interference of digital TV receiver |
| CN203502602U (en) * | 2013-10-05 | 2014-03-26 | 吉林大学 | Nuclear Magnetic Resonance Detection Device for Eliminating Power Frequency Harmonic Interference |
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