CN104849729A - Beidou satellite navigation anti-interference system - Google Patents
Beidou satellite navigation anti-interference system Download PDFInfo
- Publication number
- CN104849729A CN104849729A CN201510068586.XA CN201510068586A CN104849729A CN 104849729 A CN104849729 A CN 104849729A CN 201510068586 A CN201510068586 A CN 201510068586A CN 104849729 A CN104849729 A CN 104849729A
- Authority
- CN
- China
- Prior art keywords
- interference
- circuit
- processing module
- module
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- 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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Noise Elimination (AREA)
Abstract
The invention provides a Beidou satellite navigation anti-interference system. According to the invention, a frequency converting part between an anti-interference processing module and a baseband processing module in a traditional anti-interference GNSS receiver is saved and an antenna unit circuit and a receiving unit circuit are integrated together, so that circuit simplification is realized and complexity, cost and power consumption of a circuit board are reduced. At the same time, signal to noise ratio of signals is reduced and electromagnetic compatibility and anti-interference capability of a receiver are improved. The Beidou satellite navigation anti-interference system is characterized in that the anti-interference processing module is disposed between a radio frequency circuit and a baseband processing module; the input terminal of the anti-interference module is connected with the radio frequency circuit while the other terminal is connected with the baseband processing module; a converting circuit is integrated on the anti-interference processing module; digital intermediate frequency signals output by the radio frequency circuit are subjected to interference signal inhibition by the anti-interference module and then enter the output terminal of the baseband processing module; the converting circuit is used for implementing a converting function for bit numbers, sampling frequencies and digital intermediate frequencies.
Description
Technical field
The present invention relates to technical field of satellite navigation, particularly a kind of Beidou satellite navigation jamproof system, and a kind of anti-interference processing method of Beidou satellite navigation jamproof system.
Background technology
Satellite navigation system is made up of space constellation part, ground monitoring part and user receiving equipment three parts, possess the system of location, navigation, high precision time service function, it is widely used in the industry fields such as navigation, aviation, measurement, mapping, precision positioning.The space constellation part of satellite navigation system is made up of the multi-satellite be distributed on different orbit plane, to ensure that the arbitrary place of ground receiver at any one time, in coverage can receive the satellite-signal of sufficient amount, and by resolving the information such as the Position, Velocity and Time that obtains receiver.
At present, GPS (Global Position System) (GNSS, Global Navigation Satellite System) mainly comprises the GPS of the U.S., Muscovite GLONASS, the dipper system of China, and the GALILEO system in Europe.
Fig. 1 is the theory of constitution block diagram of conventional GNSS receiver.Conventional GNSS receiver is divided into antenna element and receiving element two large divisions usually.Antenna element, is also antenna front ends, and its effect is, by antenna, the Navsat electromagnetic wave signal in space is converted to electric signal; Export radio frequency analog signal is amplified via radio circuit, down coversion, filtering, analog to digital conversion, output digital medium-frequency signal.Wherein, down coversion refers to the intermediate-freuqncy signal signal of satellite band (frequency is generally 1GHz to 2GHz) being dropped to a few MHz to tens MHz, and intermediate-freuqncy signal just can do further signal transacting.Filtering part is a bandpass filter, and its effect is by out-of-band noise filtering.Analog to digital conversion changes digital signal into by through down coversion and filtered analog intermediate frequency signal, and digital signal just can do further digital signal processing.Receiving element carries out Base-Band Processing to the digital medium-frequency signal that antenna element exports, and then carries out resolving of navigator fix, to obtain the information such as the Position, Velocity and Time of receiver user.Baseband processing unit is generally digital circuit, mainly comprises the parts such as correlator, intermediate frequency carrier generation, the generation of code clock.
Along with satellite navigation application more prevalent, the requirement of user to receiver terminal reliability and antijamming capability also progressively improves.Receiver inevitably introduces some undesired signals in the process of carrying out Signal reception, transmission and process, and these undesired signals may come from natural interference, also may from artificial interference.If the amplitude of undesired signal is greater than the amplitude of useful signal, real satellite navigation signals will be buried in undesired signal.Once the mixed signal entering receiver does not reach the carrier-to-noise ratio required by follow-up carrier tracking loop and code tracking loop, receiver cannot normally work.Or the satellite-signal of falseness is to be better than the form of real satellite signal, allows receiver lock the satellite-signal of mistake, false navigation data will be calculated.The above these situation, all will directly have influence on the precision of navigator fix.How by these undesired signal filterings, and then strengthen the antijamming capability of receiver system, tool is of great significance, and is also the key issue that receiver system needs to solve.
Compare with receiver useful signal bandwidth, undesired signal can be divided into interference in the outer interference of band and band by us.The general antenna at receiver and front end add bandpass filter, the undesired signal be used for outside inhibition zone.If but the outer undesired signal of band is enough strong, receiver antenna and front-end filtering circuitry are not enough to be suppressed, and follow-up base band signal process and navigation calculation will be greatly affected.Meanwhile, in band, interference also can bring problems.In order to reduce the adverse effect that undesired signal causes satellite navigation signals and solution process, Fig. 2 gives a kind of theory of constitution block diagram of the GNSS receiver with anti-interference process module, wherein have employed anti-interference process module, for the undesired signal in suppression receiver passage, signal, inner the advancing from a circuit to another circuit of receiver, certainly leads to time delay.And the instability of radio frequency channel time delay, the phase jitter of intermediate-freuqncy signal and the phase center drift of receiving antenna, can cause the loss of measuring accuracy, and then affect navigation and positioning accuracy.The more important thing is, the raising of hardware circuit complexity, will cause extra snr loss (about a few dB), the Electro Magnetic Compatibility of receiver also will decline thereupon, and then reduce the antijamming capability of receiver.
Summary of the invention
The present invention is directed to the defect and deficiency that exist in prior art, a kind of Beidou satellite navigation jamproof system is provided, this system eliminates the frequency transformation part in traditional anti-interference GNSS receiver between anti-interference process module and baseband processing module, antenna element circuit and receiving element circuit are united two into one, effectively can simplify circuit, reduce the complexity of circuit board, cost and power consumption, improve operation of receiver efficiency, reduce the snr loss of signal simultaneously, improve Electro Magnetic Compatibility and the antijamming capability of receiver.The present invention also provides a kind of anti-interference processing method of Beidou satellite navigation jamproof system.
Technical scheme of the present invention is:
A kind of Beidou satellite navigation jamproof system, comprise antenna element and receiving element, it is characterized in that, described antenna element and receiving element are integral structures, comprise the antenna, radio circuit, anti-interference process module, baseband processing module and the navigation calculation module that connect successively; Described anti-interference process module is placed between radio circuit and baseband processing module, and its input end connects radio circuit, and output terminal connects baseband processing module; Described anti-interference process module is integrated with change-over circuit, after the digital medium-frequency signal that radio circuit exports is suppressed undesired signal by immunity module, directly enters the input end of baseband processing module; Described change-over circuit has been used for bit number, the translation function of sample frequency and digital intermediate frequency frequency;
Frequency transformation part is not had between described anti-interference process module and baseband processing module.
Described radio circuit comprises amplification circuits, lower frequency changer circuit part, filtering circuit part and analog to digital conversion circuit part.
Described anti-interference process module adopts anti-interference filtration technology or other anti-interference process technology, described anti-interference filtration technology comprises the one or more combination in airspace filter, frequency domain filtering and time-domain filtering, and described satellite navigation receiving system is single-system terminals or multisystem terminal; Described satellite navigation system comprises the gps system of the U.S., Russian GLONASS system, the dipper system of China, the GALILEO system in Europe, and the new satellite navigation system that later may occur.
An anti-interference processing method for Beidou satellite navigation jamproof system, is characterized in that, comprises the following steps:
1) the satellite RF signal received is carried out amplification process, down-converted, filtering process and analog-to-digital conversion process by radio circuit successively, exports digital medium-frequency signal;
2) digital medium-frequency signal exported enters anti-interference process module and carries out anti-interference process, simultaneously by being integrated in the change-over circuit in anti-interference process module, completes bit number, the conversion of sample frequency and digital intermediate frequency frequency;
3) output signal after anti-interference process resume module is carried out resolving of Base-Band Processing and navigator fix.The Anti-Jamming Technique that described anti-interference process adopts is anti-interference filtration technology or other anti-interference process technology, described anti-interference filtration technology comprises airspace filter, one or more combination in frequency domain filtering and time-domain filtering, technique effect of the present invention is embodied in, eliminate traditional with the frequency transformation part in the satellite navigation receiver of anti-interference process module between anti-interference process module and baseband processing module, antenna element circuit and receiving element circuit are united two into one, eliminate a up-converter circuit, a lower frequency changer circuit, a D/A change-over circuit and an A/D change-over circuit, achieve the integrated structure design of anti-interference satellite navigation receiving system, effectively simplify circuit, reduce the complexity of circuit board, cost and power consumption, decrease the snr loss of signal simultaneously, improve Electro Magnetic Compatibility and the antijamming capability of receiver.
Anti-interference process module in the present invention is different from traditional anti-interference process module, not only contain the repertoire of traditional anti-interference process module, also be integrated with conversion circuit part, for completing bit number, the translation function of sample frequency and digital intermediate frequency frequency; And such change-over circuit can pass through digital circuit completely, no matter from complexity in circuits, or all low many more than the frequency conversion section removed in power consumption.
Accompanying drawing explanation
Fig. 1 is the theory of constitution block diagram of conventional GNSS receiver.
Fig. 2 is traditional GNSS receiver theory of constitution block diagram with anti-interference process module.
Fig. 3 is the up-conversion mixing theory diagram of anti-interference process module.
Fig. 4 is the down coversion mixing theory diagram of anti-interference process module.
Fig. 5 is the spectrum analysis figure of up-conversion, down coversion mixing.
Fig. 6 is the theory diagram of a kind of Beidou satellite navigation jamproof system of the present invention embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
As shown in Figure 6, the integrated structure design of anti-interference satellite navigation receiving system, unites two into one antenna element and receiving element, comprises the antenna, radio circuit, anti-interference process module, baseband processing module and the navigation calculation module that connect successively; Radio circuit comprises amplification circuits, lower frequency changer circuit part, filtering circuit part and analog to digital conversion circuit part; Described anti-interference process module is placed between radio circuit and baseband processing module, and its input end connects radio circuit, and output terminal connects baseband processing module; The input end of baseband processing module is directly entered after the digital medium-frequency signal that radio circuit exports is suppressed undesired signal by immunity module.Compared with the traditional GNSS receiver with anti-interference process module shown in Fig. 2, eliminate the frequency transformation part in Fig. 2 between anti-interference process module and baseband processing module, namely a up-converter circuit is eliminated, a lower frequency changer circuit, a D/A change-over circuit and an A/D change-over circuit, only need carry out a down-converted to the satellite RF signal received, namely conversion process only comprises Fig. 5 (a) and Fig. 5 (b), and for once analog to digital conversion, just directly can carry out resolving of Base-Band Processing and navigator fix, complexity in circuits, power consumption and snr loss reduce greatly.And above-mentioned up-converter circuit and lower frequency changer circuit are all mimic channels, circuit scale is large, and signal processing is complicated, and antijamming capability is more weak.Its IF signal processing process of the satellite navigation receiver of integration of the present invention is digital circuit, has obvious signal transacting advantage.Here it should be noted that, the present invention is not the frequency-conversion circuit removed in Fig. 2 in simple meaning, the output terminal of anti-interference process module is sent into the input end of Base-Band Processing, this is because digital medium-frequency signal II in Fig. 2 and digital medium-frequency signal III is not equivalent signal, their difference is, first, bit number is different, the bit number of digital medium-frequency signal II is more, be generally more than 8 bits, and the bit number of digital medium-frequency signal III is less, be generally 1 bit, 2 bits, maximum 4 bits.The second, sample frequency is different, and digital medium-frequency signal II is the output signal of anti-interference process module, and digital medium-frequency signal III is the output signal of receiving element radio band, and the processing procedure of the two is different, and the sample frequency used is also different.3rd, IF-FRE is different, and IF-FRE of its setting of the receiving element of different manufacturers, different model is also difference to some extent.In view of these differences above, therefore anti-interference process module of the present invention is integrated with change-over circuit, not only contain the repertoire of anti-interference process module in Fig. 2, and integrated conversion circuit part, there is bit number, the translation function of sample frequency and digital intermediate frequency frequency, the digital medium-frequency signal that radio circuit is exported is by directly entering baseband processing module after immunity module process, carry out resolving of Base-Band Processing and navigator fix, eliminate traditional with the frequency transformation part in the GNSS receiver of anti-interference process module between anti-interference process module and baseband processing module.
A kind of anti-interference processing method of Beidou satellite navigation jamproof system, comprise the following steps: the Navsat electromagnetic wave signal in space is converted to electric signal by antenna, the satellite RF signal of reception is carried out amplification process, down-converted, filtering process and analog-to-digital conversion process by radio circuit successively, exports digital medium-frequency signal; The digital medium-frequency signal exported enters anti-interference process module and carries out anti-interference process, simultaneously by being integrated in the change-over circuit in anti-interference process module, completes bit number, the conversion of sample frequency and digital intermediate frequency frequency; Output signal after anti-interference process resume module is carried out resolving of Base-Band Processing and navigator fix, by baseband processing module and navigation calculation module, calculate the information such as the Position, Velocity and Time of receiver user.
Wherein adopted Anti-Jamming Technique can have number of ways, and such as popular at present anti-interference filtration technology, comprising the one or more combination of airspace filter, frequency domain filtering and time-domain filtering etc., also can be other anti-interference process technology.It is pointed out that airspace filter needs and antenna array technology combines, just can realize the optimal inhibition of undesired signal.Therefore, when Anti-Jamming Technique adopts airspace filter technology, replace antenna with antenna array accordingly, receive the satellite-signal in space.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (3)
1. a Beidou satellite navigation jamproof system, comprise antenna element and receiving element, it is characterized in that, described antenna element and receiving element are integral structures, comprise the antenna, radio circuit, anti-interference process module, baseband processing module and the navigation calculation module that connect successively; Described anti-interference process module is placed between radio circuit and baseband processing module, and its input end connects radio circuit, and output terminal connects baseband processing module; Described anti-interference process module is integrated with change-over circuit, after the digital medium-frequency signal that radio circuit exports is suppressed undesired signal by immunity module, directly enters the input end of baseband processing module; Described change-over circuit has been used for bit number, the translation function of sample frequency and digital intermediate frequency frequency; Do not have frequency transformation part between described anti-interference process module and baseband processing module, described radio circuit comprises amplification circuits, lower frequency changer circuit part, filtering circuit part and analog to digital conversion circuit part.
2. a kind of Beidou satellite navigation jamproof system according to claim 1, it is characterized in that, described anti-interference process module adopts anti-interference filtration technology or other anti-interference process technology, and described anti-interference filtration technology comprises the one or more combination in airspace filter, frequency domain filtering and time-domain filtering.
3. a kind of Beidou satellite navigation jamproof system according to claim 1, is characterized in that, described satellite navigation receiving system is single-system terminals or multisystem terminal; Described satellite navigation system is the dipper system of China.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510068586.XA CN104849729A (en) | 2015-02-10 | 2015-02-10 | Beidou satellite navigation anti-interference system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510068586.XA CN104849729A (en) | 2015-02-10 | 2015-02-10 | Beidou satellite navigation anti-interference system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104849729A true CN104849729A (en) | 2015-08-19 |
Family
ID=53849512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510068586.XA Pending CN104849729A (en) | 2015-02-10 | 2015-02-10 | Beidou satellite navigation anti-interference system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104849729A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008414A (en) * | 2017-12-29 | 2018-05-08 | 扬州宇安电子科技有限公司 | A kind of targeted electronic interference disposal intercepting system |
| CN108072882A (en) * | 2017-11-28 | 2018-05-25 | 天津七六四通信导航技术有限公司 | A kind of Beidou navigation jamproof system and its signal receiving device |
| CN108919819A (en) * | 2018-05-22 | 2018-11-30 | 北京和协导航科技有限公司 | Navigation of Pilotless Aircraft communication integral system and method |
| CN110161539A (en) * | 2019-04-26 | 2019-08-23 | 湖南卫导信息科技有限公司 | A kind of portable remote-controlled navigation full frequency band interference signal generation system |
| CN110333507A (en) * | 2019-06-13 | 2019-10-15 | 中国科学院电子学研究所 | Multiple-input multiple-output synthetic aperture radar image-forming method |
| CN110988924A (en) * | 2019-12-10 | 2020-04-10 | 上海航天控制技术研究所 | Anti-interference BDS/GPS receiver based on array antenna |
| CN112461229A (en) * | 2020-11-13 | 2021-03-09 | 安徽四创电子股份有限公司 | High-precision attitude measurement system based on low-cost module |
| CN117269991A (en) * | 2023-11-22 | 2023-12-22 | 北京李龚导航科技有限公司 | Basic device of satellite navigation anti-interference terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207549A (en) * | 2010-05-05 | 2011-10-05 | 北京泰豪联星技术有限公司 | Integrated anti-interference satellite navigation receiving system and anti-interference processing method thereof |
| EP1862816B1 (en) * | 2006-06-04 | 2013-03-20 | SISVEL Technology Srl | Time-frequency interfering detector |
| CN103760575A (en) * | 2014-01-15 | 2014-04-30 | 北京北斗星通导航技术股份有限公司 | Anti-interference Beidou satellite navigation receiver board card and receiver terminal thereof |
| CN104267412A (en) * | 2014-08-13 | 2015-01-07 | 芜湖航飞科技股份有限公司 | Naval vessel Beidou satellite navigation anti-interference system |
-
2015
- 2015-02-10 CN CN201510068586.XA patent/CN104849729A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1862816B1 (en) * | 2006-06-04 | 2013-03-20 | SISVEL Technology Srl | Time-frequency interfering detector |
| CN102207549A (en) * | 2010-05-05 | 2011-10-05 | 北京泰豪联星技术有限公司 | Integrated anti-interference satellite navigation receiving system and anti-interference processing method thereof |
| CN103760575A (en) * | 2014-01-15 | 2014-04-30 | 北京北斗星通导航技术股份有限公司 | Anti-interference Beidou satellite navigation receiver board card and receiver terminal thereof |
| CN104267412A (en) * | 2014-08-13 | 2015-01-07 | 芜湖航飞科技股份有限公司 | Naval vessel Beidou satellite navigation anti-interference system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072882A (en) * | 2017-11-28 | 2018-05-25 | 天津七六四通信导航技术有限公司 | A kind of Beidou navigation jamproof system and its signal receiving device |
| CN108008414A (en) * | 2017-12-29 | 2018-05-08 | 扬州宇安电子科技有限公司 | A kind of targeted electronic interference disposal intercepting system |
| CN108919819A (en) * | 2018-05-22 | 2018-11-30 | 北京和协导航科技有限公司 | Navigation of Pilotless Aircraft communication integral system and method |
| CN108919819B (en) * | 2018-05-22 | 2023-10-27 | 北京和协导航科技有限公司 | Unmanned aerial vehicle navigation communication integrated system and method |
| CN110161539A (en) * | 2019-04-26 | 2019-08-23 | 湖南卫导信息科技有限公司 | A kind of portable remote-controlled navigation full frequency band interference signal generation system |
| CN110333507A (en) * | 2019-06-13 | 2019-10-15 | 中国科学院电子学研究所 | Multiple-input multiple-output synthetic aperture radar image-forming method |
| CN110988924A (en) * | 2019-12-10 | 2020-04-10 | 上海航天控制技术研究所 | Anti-interference BDS/GPS receiver based on array antenna |
| CN112461229A (en) * | 2020-11-13 | 2021-03-09 | 安徽四创电子股份有限公司 | High-precision attitude measurement system based on low-cost module |
| CN117269991A (en) * | 2023-11-22 | 2023-12-22 | 北京李龚导航科技有限公司 | Basic device of satellite navigation anti-interference terminal |
| CN117269991B (en) * | 2023-11-22 | 2024-04-05 | 北京李龚导航科技有限公司 | Basic device of satellite navigation anti-interference terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104849729A (en) | Beidou satellite navigation anti-interference system | |
| CN102207549A (en) | Integrated anti-interference satellite navigation receiving system and anti-interference processing method thereof | |
| CN108521292B (en) | Ultra-wideband digital satellite beacon receiving method and receiver based on software radio | |
| CN101833100B (en) | Method for constructing fully-digital GNSS compatible navigation receiver | |
| CN103412317A (en) | Radio-frequency circuit structure for achieving function of converting GNSS satellite signals into baseband signals | |
| CN109164447B (en) | Electromagnetic spectrum reconnaissance device of L-band low-altitude monitoring radar | |
| CN104793189B (en) | A kind of marine radar digitised Intermediate Frequency coherent receiving processing system based on FPGA | |
| CN104749591A (en) | Global navigation satellite system oriented multi-mode parallel radio-frequency receiver | |
| CN103728634B (en) | Double-antenna A-GNSS receiving machine system | |
| CN102916712B (en) | Wireless receiver | |
| CN104459735B (en) | The high-precision difference service of Big Dipper satellite-based receives device | |
| CN102916719A (en) | Multichannel, multimode, multifunction L-band radio transreceiver | |
| CN104104400A (en) | High-sensitivity satellite-borne ADS-B signal receiver | |
| CN109799516B (en) | Device for GNSS interference detection and positioning | |
| CN108594279A (en) | A kind of device received suitable for multisystem navigation signal monitoring | |
| CN110988924A (en) | Anti-interference BDS/GPS receiver based on array antenna | |
| CN102540219A (en) | Receiving method and receiver for signal of global navigation satellite system | |
| CN102540204B (en) | Single-chip dual-frequency global satellite navigation receiver | |
| CN103323862A (en) | Anti-interference GNSS receiver device combining multiple modes and multiple frequencies with array processing | |
| CN103529456A (en) | Anti-interference A/D (analog-to-digital) chip for Compass satellite navigation | |
| CN205826868U (en) | A kind of Big Dipper transceiver module | |
| Qi et al. | A dual-channel GPS/Compass/Galileo/GLONASS reconfigurable GNSS receiver in 65nm CMOS | |
| CN103389500A (en) | Digital intermediate frequency signal generation device for satellite navigation system | |
| CN103176196A (en) | Receiving method for interoperation receiver | |
| CN219695465U (en) | Navigation satellite signal transponder with single-frequency point switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150819 |