CN202182940U - Generation system of large-bandwidth linear frequency modulation signal - Google Patents
Generation system of large-bandwidth linear frequency modulation signal Download PDFInfo
- Publication number
- CN202182940U CN202182940U CN2011202819885U CN201120281988U CN202182940U CN 202182940 U CN202182940 U CN 202182940U CN 2011202819885 U CN2011202819885 U CN 2011202819885U CN 201120281988 U CN201120281988 U CN 201120281988U CN 202182940 U CN202182940 U CN 202182940U
- Authority
- CN
- China
- Prior art keywords
- frequency
- pulse
- frequency modulation
- signal
- modulator
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to a generation system of a large-bandwidth linear frequency modulation signal. The generation system comprises a narrowband digital signal generator, a frequency modulation tracking phase-locked loop, a modulator and a clock and time sequence controller. A phase-lock technique is employed to carry out phase tracking and multiplication on a narrowband frequency modulation signal to realize a large bandwidth; besides, the system has advantages of less non-linear distortion of an amplitude phase, simple structure, low cost and easiness of integration. According to the utility model, a frequency multiplication technology that is capable of realizing bandwidth multiplication is realized; and non-linear distortion of an amplitude phase of a large-bandwidth signal is substantially improved. The technology employed in the generation system is one of key technologies of a high resolution synthetic aperture radar.
Description
Technical field
The utility model belongs to big bandwidth linear FM signal generating technique, and be specifically related to a kind of high performance wideband linear FM signal and produce system, be one of gordian technique of high-resolution synthetic-aperture radar.
Background technology
Characteristics such as the synthetic aperture radar (SAR) reconnaissance system is round-the-clock owing to it, round-the-clock, safety coefficient height, just by the international market extensive concern, its middle high-resolution is the eternal pursuit of SAR system.The realization of big bandwidth linear FM signal is one of gordian technique of synthetic aperture radar (SAR); Receive the restriction of sampling rate; The general at present digital technology generation base band linear FM signal that adopts carries out frequency multiplication again and carry out the bandwidth expansion, and there is bigger width of cloth distortion mutually in frequency multiplier with wave filter; Had a strong impact on quality of signals, when very big bandwidth even can't form images.Simultaneously volume, power consumption are bigger, are difficult to realize microminiaturized integrated.
This patented technology adopts the narrow-band digital FM signal to combine the phase locked track mode to realize big bandwidth FM signal, and this technology principal feature is that the amplitude-phase non-linearity distortion is little, and simple in structure, cost is low, and is easy of integration.Overcome the frequency doubling technology for realizing that bandwidth doubles in the prior art, greatly improved the amplitude-phase non-linearity distortion of big bandwidth signal.
The utility model content
The utility model technical matters to be solved is the realization of big bandwidth linear FM signal.Adopt the phase locked track technology that the arrowband linear FM signal of frequency-shift keying signal generator is carried out Phase Tracking and multiplication, realize big bandwidth linear FM signal.Because the phaselocked loop Phase Tracking time is exceedingly fast; And pull-in time is longer, is difficult to satisfy SAR radar burst pulse duty, therefore need carry out frequency directing; By clock and time schedule controller pll output signal is carried out the intercepting of time domain, obtain the big bandwidth pulses linear FM signal of expectation.
The technical scheme that the utility model adopted is:
A kind of big bandwidth linear FM signal produces system, is made up of clock and time schedule controller 1, digital frequency-modulation signal generator 2, frequency modulation tracking phaselocked loop 3 and pulse-modulator 4; Clock and time schedule controller 1 connect frequency-shift keying signal generator 2 and pulse-modulator 4, and clock and time schedule controller 1 are that digital frequency-modulation signal generator 2 is carried high stable clock and pulse triggering signal, for pulse-modulator 4 is carried modulating pulse; 2 outputs of digital frequency-modulation signal generator connect frequency modulation and follow the tracks of phaselocked loop 3, follow the tracks of phaselocked loop 3 for frequency modulation the frequency modulation reference is provided; Frequency modulation is followed the tracks of phaselocked loop 3 outputs and is connected pulse-modulator 4, follows the tracks of phaselocked loop 3 output signals by 4 pairs of frequency modulation of pulse-modulator and modulates selection in time domain; Pulse-modulator 4 outputs are the big bandwidth linear FM signal of expectation.
The good effect of the utility model is:
This technology adopts digital frequency-modulation signal to combine the phase locked track mode to realize big bandwidth FM signal, and this technology principal feature is that the amplitude-phase non-linearity distortion is little, and simple in structure, cost is low, and is easy of integration.Overcome the frequency doubling technology for realizing that bandwidth doubles in the prior art, greatly improved the amplitude-phase non-linearity distortion of big bandwidth signal.
Adopt frequency directing and pulsed modulation, solved the pulsed operation state of phaselocked loop.
Adopt the relative narrow-band frequency modulation signal of digital phase-locking to carry out Phase Tracking and multiplication, simplified circuit structure to greatest extent, realized microminiaturization.
The utility model is mainly used in the high resolution synthetic aperture radar reconnaissance system; Can be widely used in carried SAR, missile-borne SAR, the Spaceborne SAR System; The big bandwidth signal generator volume of simultaneously should technology realizing is little, low in energy consumption, in multiple chain-wales SAR reconnaissance system, in Review for Helicopter, system such as unmanned airborne even spaceborne; Have very high engineering practical value, its social value and economic worth are very considerable.
Description of drawings
Fig. 1 is the structure principle chart of the utility model.
Fig. 2 is the sequential chart of the utility model.
Embodiment
The design philosophy of the utility model is, the linear FM signal of wide and relative arrowband is carried out the Phase Tracking and the big bandwidth linear FM signal of realization that doubles by following the tracks of phaselocked loop to this signal when producing expectation by narrow-band digital FM signal generator.Because the pull-in time of phaselocked loop is longer, therefore the unsuitable failure of oscillation (time of resuming work behind the failure of oscillation is longer) of phaselocked loop voltage controlled oscillator (VCO) frequency carries out frequency directing outside the pulse working time of expectation simultaneously, promptly uses f before the pulse
1F is used in guiding after the pulse
2Guiding.
The composition of the hardware of the utility model is as shown in Figure 1: clock and time schedule controller 1, digital frequency-modulation signal produce 2, follow the tracks of phaselocked loop 3 and pulse-modulator 4 compositions.Wherein,
Clock and time schedule controller 1 connects frequency-shift keying signal generator 2 and pulse-modulator 4, and clock and time schedule controller 1 provide high stable clock and pulse triggering signal for digital frequency-modulation signal generator 2, for pulse-modulator 4 provides modulating pulse; 2 outputs of digital frequency-modulation signal generator connect frequency modulation and follow the tracks of phaselocked loop 3, follow the tracks of phaselocked loop 3 for frequency modulation the frequency modulation reference is provided; Frequency modulation is followed the tracks of phaselocked loop 3 outputs and is connected pulse-modulator 4, follows the tracks of pll output signal by 4 pairs of frequency modulation of pulse-modulator and modulates selection in time domain; Pulse-modulator 4 outputs are the big bandwidth linear FM signal of expectation.
The work of the utility model divides three functions, and promptly digital arrowband linear FM signal produces, phase locked track ring, sequential control and pulsed modulation;
Principle of work and flow process:
1. system power-up, clock and time schedule controller 1 provide work clock for digital frequency-modulation signal generator 2, and digital frequency-modulation signal generator 2 output points are sinusoidal signal f frequently
1, f
1Make frequency modulation follow the tracks of phaselocked loop 3 outputs and be locked in n f
1On.
2. clock and time schedule controller 1 produce trigger pulse according to system directive and make the regularly wide linear FM signal of digital frequency-modulation signal generator 2 generations one, and frequency range is f
1～f
2, bandwidth is f
2-f
1f
1And f
2Frequency and f
1Frequency modulation is to f
2Time wide mode code by clock and time schedule controller 1 confirm.
3. frequency modulation is followed the tracks of phaselocked loop 3 under the traction of digital frequency-modulation signal generator 2 output frequencies, and output frequency is nf
1～n f
2, bandwidth expands to big bandwidth n (f
2-f
1).
4. clock and time schedule controller produce modulating pulse according to the time delay relation of digital frequency-modulation signal generator 2 with frequency modulation tracking phaselocked loop 3.Pulse-modulator 4 is followed the tracks of phaselocked loop 3 output frequencies according to modulating pulse to frequency modulation and is carried out intercepting by time domain, obtains the big bandwidth linear FM signal of expectation.
Claims (1)
1. one kind big bandwidth linear FM signal produces system, is made up of clock and time schedule controller (1), digital frequency-modulation signal generator (2), frequency modulation tracking phaselocked loop (3) and pulse-modulator (4), it is characterized in that:
Clock and time schedule controller (1) connect frequency-shift keying signal generator (2) and pulse-modulator (4); Clock and time schedule controller (1) are that digital frequency-modulation signal generator (2) is carried high stable clock and pulse triggering signal, for pulse-modulator (4) is carried modulating pulse; Digital frequency-modulation signal generator (2) output connects frequency modulation and follows the tracks of phaselocked loop (3), follows the tracks of phaselocked loop (3) for frequency modulation the frequency modulation reference is provided; Frequency modulation is followed the tracks of phaselocked loop (3) output and is connected pulse-modulator (4), by pulse-modulator (4) frequency modulation is followed the tracks of phaselocked loop (3) output signal and modulates selection in time domain; The big bandwidth linear FM signal of pulse-modulator (4) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202819885U CN202182940U (en) | 2011-08-05 | 2011-08-05 | Generation system of large-bandwidth linear frequency modulation signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202819885U CN202182940U (en) | 2011-08-05 | 2011-08-05 | Generation system of large-bandwidth linear frequency modulation signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202182940U true CN202182940U (en) | 2012-04-04 |
Family
ID=46175972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202819885U Expired - Lifetime CN202182940U (en) | 2011-08-05 | 2011-08-05 | Generation system of large-bandwidth linear frequency modulation signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202182940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983157A (en) * | 2018-09-14 | 2018-12-11 | 中国科学院电子学研究所 | Generate the system and method for wideband correlation |
-
2011
- 2011-08-05 CN CN2011202819885U patent/CN202182940U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983157A (en) * | 2018-09-14 | 2018-12-11 | 中国科学院电子学研究所 | Generate the system and method for wideband correlation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103675767B (en) | A kind of ultra wide band low power radiofrequency signal generator and method thereof | |
| CN108964660A (en) | A kind of high-resolution low-power consumption spread spectrum control circuit based on phase delay compensation | |
| CN104467835A (en) | Frequency-agile and low-phase-noise frequency source | |
| CN203632644U (en) | Novel X wave band frequency synthesizer based on DDS and PLL | |
| CN105223555A (en) | A kind of wideband low noise frequency modulation signal source | |
| CN105162742A (en) | Asymmetric triangle frequency modulation radar communication integrated signal waveform determination method | |
| CN101483433B (en) | High frequency synthesizer for step frequency | |
| CN101494449B (en) | Excitation type pulse generator | |
| CN202182940U (en) | Generation system of large-bandwidth linear frequency modulation signal | |
| CN205176262U (en) | S wave band radar system frequency source | |
| CN204439829U (en) | Multifunction radar waveform generator and multiband radar expanding system | |
| CN203858359U (en) | Unmanned plane line patrol obstacle avoidance radar broadband linearity frequency modulation continuous millimeter wave signal emission source | |
| CN205179021U (en) | X wave band broadband frequency synthesizer | |
| Lou et al. | A DDS-driven ADPLL chirp synthesizer with ramp-interpolating linearization for FMCW radar application in 65nm CMOS | |
| CN106342405B (en) | Digital radar frequency synthesizer controls pulse-generating circuit | |
| CN201813398U (en) | Digital circuit for implementing binary frequency shift keying modulation | |
| CN203014777U (en) | Simplified frequency agility frequency synthesizer based on DDS non-linear characteristics | |
| CN105103002A (en) | Pulse generation device | |
| RU139547U1 (en) | DEVICE FOR FORMULATION OF MODULATED SIGNALS | |
| CN202395753U (en) | 100MHz-850MHz broadband excitation signal source | |
| CN105334500A (en) | S-band radar system frequency source | |
| CN204789984U (en) | Radar waveform generator based on FPGA | |
| Li et al. | Reconfigurable, spectrally efficient, high data rate IR-UWB transmitter design using a Δ–Σ PLL driven ILO and a 7-tap FIR filter | |
| CN113315514B (en) | Dual-mode spread spectrum clock generator | |
| CN213957604U (en) | Linear frequency modulation signal source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120404 |
|
| CX01 | Expiry of patent term |