CN106656247A - Improved digital frequency conversion frequency modulation source - Google Patents
Improved digital frequency conversion frequency modulation source Download PDFInfo
- Publication number
- CN106656247A CN106656247A CN201611000914.3A CN201611000914A CN106656247A CN 106656247 A CN106656247 A CN 106656247A CN 201611000914 A CN201611000914 A CN 201611000914A CN 106656247 A CN106656247 A CN 106656247A
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- China
- Prior art keywords
- source
- frequency
- frequency conversion
- pulse
- transmitting antenna
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides an improved digital frequency conversion frequency modulation source, which comprises a signal processing module, a data acquisition module, a mixer, a low noise high gain amplifier, a reception antenna, an emission antenna, a linear frequency modulation source and a direct digital frequency synthesizer. The improved digital frequency conversion frequency modulation source effectively overcomes a contradiction between an operating distance and distance resolution of linear frequency modulation signals. Through frequency conversion modulation, the signal output end anti-interference capability can be effectively improved, and possibilities that output signals are intercepted can be reduced. The system exhibits high information carrying capability. Meanwhile, an antenna array is adopted, and devices and antennas do not need motion scanning, the real-time performance of imaging is improved, and three-dimensional imaging can be realized.
Description
Technical field
The present invention relates to LFM Source technical field, more particularly to a kind of Improved digital frequency conversion FM source.
Background technology
Wideband LFM signal generator is widely used in electronic surveying, communication navigation, the anti-dress of automobile, frequency modulated(FM) radar, compression
The fields such as receiver, radar simulator, electronic warfare, producing the major technique of linear FM signal has analogue technique and digital skill
Art.Analogue technique mainly using existing than larger non-linear relation between sweep voltage, when entering line frequency using linear voltage
During modulation, the frequency signal of VCO outputs is actually nonlinear, although and analogue signal is directly perceived and easily realize, its
Confidentiality and anti-interference are relatively poor.Adopt the Improved digital frequency conversion FM source can be with the work of effectively solving linear FM signal
With the contradiction between distance and range resolution, and by variable frequency adjustment, can effectively improve the safety of output signal.
The content of the invention
The invention mainly solves the technical problem of providing a kind of Improved digital frequency conversion FM source, can effectively solve
Contradiction between the operating distance and range resolution of linear FM signal, while using variable frequency adjustment, can effectively improve
Signal output part capacity of resisting disturbance, can also reduce the intercepted probability of output signal, with higher information embarkation ability.
To solve above-mentioned technical problem, one aspect of the present invention is：A kind of digital frequency conversion FM source is provided,
Characterized in that, including：Signal processing module, data acquisition module, frequency mixer, low noise high gain amplifier, reception antenna,
Transmitting antenna, pulse frequency control circuit, LFM Source and Direct Digital Synthesizer；
The LFM Source is connected respectively with Direct Digital Synthesizer and frequency mixer, and by Direct Digital frequency
Synthesizer connects transmitting antenna, and the transmitting antenna and reception antenna match, and the reception antenna passes through low noise high-gain
Amplifier is connected with frequency mixer, and the frequency mixer is connected with data acquisition module, the data acquisition module and signal processing mould
Block is connected；The LFM Source connects external pulse frequency control circuit.
The transmitting antenna is some groups of aerial arrays, and every group of aerial array includes several independent transmission antennas, each
Transmitting antenna connects the Direct Digital Synthesizer, and by adjusting digital sample frequency the numeral of transmission signal is adjusted
Frequency, signal power is improved also dependent on particular situation adjustment using the quantity of antenna.
Preferably, the low noise high gain amplifier carries threshold voltage, receives signal and improves system for amplifying
Capacity of resisting disturbance.
Preferably, the pulse frequency changer circuit includes external 12V DC sources, Pulse Width Control chip, the input of chip
Connection pulse sequence circuit, internal switch series rectifier diode；Chip output accesses load resistance；The pulse output of chip
The input of connection LFM Source, as the control signal of LFM Source.
The situation of prior art is different from, the invention has the beneficial effects as follows：Linear FM signal can effectively be solved
Contradiction between operating distance and range resolution, using variable frequency adjustment, can effectively improve the anti-interference energy of signal output part
Power, can also reduce the intercepted probability of output signal, with higher information embarkation ability, while using aerial array, device and
Antenna need not carry out moving sweep, improve the real-time of imaging and be capable of achieving three-dimensional imaging.
Description of the drawings
Fig. 1 is the schematic diagram of embodiment of the present invention Improved digital frequency conversion FM source.
Wherein, 1, signal processing module, 2, data acquisition module, 3, frequency mixer, 4, low-noise amplifier, 5, receive day
Line, 6, transmitting antenna, 7, LFM Source, 8, Direct Digital Synthesizer, 9, pulse frequency control circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Such as a kind of digital frequency conversion FM source that Fig. 1 is provided, it is characterised in that include：Signal processing module, data acquisition module
Block, frequency mixer, low noise high gain amplifier, reception antenna, transmitting antenna, pulse frequency control circuit, LFM Source and
Direct Digital Synthesizer；
The LFM Source is connected respectively with Direct Digital Synthesizer and frequency mixer, and by Direct Digital frequency
Synthesizer connects transmitting antenna, and the transmitting antenna and reception antenna match, and the reception antenna passes through low noise high-gain
Amplifier is connected with frequency mixer, and the frequency mixer is connected with data acquisition module, the data acquisition module and signal processing mould
Block is connected；The LFM Source connects external pulse frequency control circuit.
The transmitting antenna and reception antenna are some groups of aerial arrays, and every group of aerial array includes several independent days
Line, each transmitting antenna connects the Direct Digital Synthesizer, and transmitting letter is adjusted by adjusting digital sample frequency
Number numerical frequency, also dependent on particular situation adjustment improve signal power using the quantity of antenna.
The low noise high gain amplifier carries threshold voltage, receives signal and improves the anti-interference of system for amplifying
Ability.
In the present embodiment, the pulse frequency changer circuit include external 12V DC sources, Pulse Width Control chip, chip it is defeated
Enter end connection pulse sequence circuit, internal switch series rectifier diode；Chip output accesses load resistance；The pulse of chip
The input of output connection LFM Source, as the control signal of LFM Source；The low noise high gain amplifier is carried
Threshold voltage, for amplifying the capacity of resisting disturbance for receiving signal and improving system.
Specifically, when pwm pulse is high level, the COM ends of U1 are thrown to normal-closed end NC, the adjustment foot of TL431 and positive electricity
Presser feet is connected, and exports low level.When pwm pulse is low level, the COM ends of U1 are thrown to normally opened end NO, the output voltage of TL431
Adjustment foot is sent to after R2, R3 partial pressure, now output HIGH voltage.So, when the input pin IN of U1 is input into pwm signal, electricity
Road exports accordingly high low pulse voltage.The frequency for adjusting pulse frequency changer circuit input pulse by peripheral circuit can complete letter
The frequency of number generator output signal, reaches Fast transforms output signal frequency, and jamproof effect during use, is only needed
Enter to be completed by line frequency is adjusted the output signal frequency of the digital frequency conversion FM source to the input signal of pulse frequency control circuit
Rate, its output signal has very high safety.
By the way, the Improved digital frequency conversion FM source of the embodiment of the present invention can effectively solve linear frequency modulation
Contradiction between the operating distance and range resolution of signal, while need not be transported using aerial array, device and antenna
Dynamic scanning, improves the real-time of imaging and is capable of achieving three-dimensional imaging.
Embodiments of the invention are the foregoing is only, the scope of the claims of the present invention is not thereby limited, it is every using this
Equivalent structure or equivalent flow conversion that bright description and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (3)
1. a kind of Improved digital frequency conversion FM source, it is characterised in that include：A kind of digital frequency conversion FM source, it is characterised in that
Including：Signal processing module, data acquisition module, frequency mixer, low noise high gain amplifier, reception antenna, transmitting antenna, arteries and veins
Rush frequency control circuit, LFM Source and Direct Digital Synthesizer；
The LFM Source is connected respectively with Direct Digital Synthesizer and frequency mixer, and by Direct Digital frequency
Synthesizer connects transmitting antenna, and the transmitting antenna and reception antenna match, and the reception antenna passes through low noise high-gain
Amplifier is connected with frequency mixer, and the frequency mixer is connected with data acquisition module, the data acquisition module and signal processing mould
Block is connected；The LFM Source connects external pulse frequency control circuit.
The transmitting antenna is some groups of aerial arrays, and every group of aerial array includes several independent transmission antennas, each transmitting
Antenna connects the Direct Digital Synthesizer.
2. Improved digital frequency conversion FM source according to claim 1, it is characterised in that：The pulse frequency changer circuit includes
External 12V DC sources, Pulse Width Control chip, the input connection pulse sequence circuit of chip, internal switch series rectifier two
Pole pipe；Chip output accesses load resistance；The input of the pulse output connection LFM Source of chip, as LFM Source
Control signal.
3. Improved digital frequency conversion FM source according to claim 1, it is characterised in that：The low noise plus and blowup
Device carries threshold voltage, for amplifying the capacity of resisting disturbance for receiving signal and improving system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611000914.3A CN106656247A (en) | 2016-11-14 | 2016-11-14 | Improved digital frequency conversion frequency modulation source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611000914.3A CN106656247A (en) | 2016-11-14 | 2016-11-14 | Improved digital frequency conversion frequency modulation source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106656247A true CN106656247A (en) | 2017-05-10 |
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ID=58806530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611000914.3A Pending CN106656247A (en) | 2016-11-14 | 2016-11-14 | Improved digital frequency conversion frequency modulation source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332883A (en) * | 2020-11-18 | 2021-02-05 | 成都菲斯洛克电子技术有限公司 | Low-power-consumption small-size linear frequency modulation source transceiving module |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201928271U (en) * | 2011-03-02 | 2011-08-10 | 上海大学 | Non-directional beacon receiver based on direct digital synthesis (DDS) |
| CN103430456A (en) * | 2012-10-31 | 2013-12-04 | 华为技术有限公司 | Transmitter, receiver, and method for RF transceiving |
| CN204836148U (en) * | 2015-06-11 | 2015-12-02 | 西安佳中电子技术有限公司 | Variable bandwidth double conversion multichannel receiver |
| CN105866746A (en) * | 2016-04-01 | 2016-08-17 | 芜湖航飞科技股份有限公司 | Application of FMCW system T/R unit in digital phased array |
-
2016
- 2016-11-14 CN CN201611000914.3A patent/CN106656247A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201928271U (en) * | 2011-03-02 | 2011-08-10 | 上海大学 | Non-directional beacon receiver based on direct digital synthesis (DDS) |
| CN103430456A (en) * | 2012-10-31 | 2013-12-04 | 华为技术有限公司 | Transmitter, receiver, and method for RF transceiving |
| CN204836148U (en) * | 2015-06-11 | 2015-12-02 | 西安佳中电子技术有限公司 | Variable bandwidth double conversion multichannel receiver |
| CN105866746A (en) * | 2016-04-01 | 2016-08-17 | 芜湖航飞科技股份有限公司 | Application of FMCW system T/R unit in digital phased array |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332883A (en) * | 2020-11-18 | 2021-02-05 | 成都菲斯洛克电子技术有限公司 | Low-power-consumption small-size linear frequency modulation source transceiving module |
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170510 |
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| RJ01 | Rejection of invention patent application after publication |