CN108344977A - Frequency stepping radar signal source system - Google Patents
Frequency stepping radar signal source system Download PDFInfo
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- CN108344977A CN108344977A CN201810139181.4A CN201810139181A CN108344977A CN 108344977 A CN108344977 A CN 108344977A CN 201810139181 A CN201810139181 A CN 201810139181A CN 108344977 A CN108344977 A CN 108344977A
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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
- 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
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
Abstract
Present disclose provides a kind of frequency stepping radar signal source systems, including：Step Frequency Baseband subsystem circuit, export Step Frequency Baseband subsystem B1, first order signal conditioning circuit, export stepped frequency signal B4, and second level signal conditioning circuit, it is mixed in frequency mixer with the stepped frequency signal of B4, the centre frequency to Step Frequency Baseband subsystem and bandwidth successive adjustment, obtains the ultra wide band stepped frequency signal that bandwidth is B；Wherein, the first order signal conditioning circuit and second level signal conditioning circuit include frequency mixer, local oscillator, high-speed switch and filter.By the centre frequency and bandwidth successive adjustment to Step Frequency Baseband subsystem, ultra wide band stepped frequency signal is finally obtained, and being switched fast for frequency may be implemented.
Description
Technical field
This disclosure relates to Radar Technology field more particularly to a kind of frequency stepping radar signal source system.
Background technology
With the development of modern radar technology, the function of simply being measured target range that conventional radar has is
Through actual needs far can not be met.How high-resolution imaging is carried out to target, and then realizes the detection and discriminating to target
Have become an important directions of Radar Technology research.According to radar basic principle, High Range Resolution needs pass through transmitting
Big broadband signal obtains.Stepped frequency radar can be utilized as a kind of high-resolution signal with big Timed automata
Smaller instant bandwidth synthesizes larger bandwidth of operation, also reduces while improving distance resolution and is wanted to system hardware
It asks.
1999, it was 0.3GHz~3.0GHz that Stanford Research Institute of the U.S., which has developed a frequency band, since each frequency point is held
The continuous time is 5us, which is that fixed point scans, that is, complete to move again to after the scanning in a region next region into
Row scanning.At present at home, applying frequency stepping is seldom as the radar system of radar pumping signal, applies vector network mostly
Analyzer builds a complete radar system as research, and the technology is also in developing stage in terms of business, and system is realized
There is also many technical barriers.With the progress of waveform generation technique, around big bandwidth, fast frequency conversion, high stable frequency steps
The design in inlet signal source is increasingly becoming the focus of various fields.
Currently used frequency synthesis technique scheme has direct digital synthesizers (Direct Digital Frequency
Synthesis, DDS) scheme, phaselocked loop (Phase Lock Loop, PLL) frequency synthesis scheme and mixed frequency scheme.
DDS is, directly to being sampled with reference to sinusoidal signal, to obtain different phases from phase concept, pass through number
Word computing technique generates corresponding voltage amplitude, the last required frequency of filtering output.Since DDS uses digital structure,
Can get higher frequency resolution and faster frequency transformation rate, but DDS schemes also have output frequency it is low, it is spuious compared with
Difference, the shortcomings of harmonic wave is higher.
PLL is a kind of phase locking system, after it to reference-input signal by carrying out the operations such as frequency multiplication, frequency dividing, mixing
Required frequency signal is obtained, and the phase error between output signal and reference signal is constantly adjusted using feedback circuit, so that
Output frequency is gradually drawn close to reference frequency, and rate-adaptive pacemaker is obtained eventually by voltage controlled oscillator, has wider output frequency
The advantages that range, spurious reduction are good is widely used in communication, radar, instrument and meter and navigation system.But phaselocked loop
Output signal frequency switching time is long, and frequency resolution is low, applies in general to the occasion not high to frequency error factor rate request.
Mixed frequency scheme be signal that DDS or PLL are generated is obtained by other modes such as mixing, frequencys multiplication it is desired defeated
Go out frequency.Mixed frequency scheme uses relatively broad in the generation technology of current frequency source, and the program has the following：
(1) DDS adds in frequency multiplier scheme that DDS is as baseband signal, the small bandwidth Step Frequency generated to DDS using frequency multiplier
Signal doubles, to realize frequency expansion.The program remains the fast advantage of DDS frequency error factors, and structure is relatively easy.But
It is the output of frequency multiplier to have compared with multiple-harmonic, needs effectively to filter out harmonic component, for a N frequency doubling system, input frequency band
It must satisfy：N·fL＞ (N-1) fH, NfH＜ (N+1) fL.And as frequency multiplication number is continuously improved, subsequent filter
Manufacture difficulty and the complexity of frequency multiplier circuit dramatically increase, substantially reduced so as to cause the realizability of whole system；
(2) DDS adds functions of the PLL equally as N frequencys multiplication in PLL schemes, and frequency multiplication is carried out to the output signal of DDS.It is this
Signal source has the advantages that working frequency is high, output band is wide, frequency resolution is high.At the same time, the signal of DDS circuit output
After PLL circuit extending bandwidth, good phase noise specifications and spurious reduction performance can also be obtained.But the signal source
Frequency error factor speed mainly determine that frequency switching time is longer by PLL circuit, can not play DDS fast frequencies switching it is excellent
Point cannot meet the requirement of high speed frequency conversion system；
(3) DDS adds the function that frequency mixer frequency spectrum shift is utilized in mixer solution, is carried out to the centre frequency of DDS signals
Adjustment remains the fast advantage of DDS frequency error factors, and DDS is exported without PLL frequencys multiplication, but is mixed with PLL the output phases,
Therefore the phase noise of DDS outputs and spuious will not deteriorate in frequency multiplication.But relatively upper two schemes, bandwidth will not change after mixing
Become, and frequency mixer introduces unnecessary frequency component, needs the input signal of design optimization frequency mixer, to guarantee to filter out
Fall spurious components.
In order to overcome the shortcomings of the signal source of frequency stepping system in bandwidth and sweep speed, there is an urgent need for a kind of signal source,
Not only structure has faster frequency error factor speed to meet the requirement quickly scanned, synchronous signal source output bandwidth to the signal source
Greatly.
Invention content
(1) technical problems to be solved
Present disclose provides a kind of ultra wide band, fast switching frequency stepping radar signal source system, at least partly solve with
The technical issues of upper proposed.
(2) technical solution
According to one aspect of the disclosure, a kind of frequency stepping radar signal source system is provided, including：Step Frequency
Baseband subsystem circuit exports Step Frequency Baseband subsystem B1, and first order signal conditioning circuit exports stepped frequency signal B4, with
And second level signal conditioning circuit, it is mixed in frequency mixer with the stepped frequency signal of B4, to the center of Step Frequency Baseband subsystem
Frequency and bandwidth successive adjustment, output bandwidth are the ultra wide band stepped frequency signal of B；Wherein, the first order signal conditioning circuit
And second level signal conditioning circuit includes frequency mixer, local oscillator, high-speed switch and filter.
In the disclosure some embodiments, the reference frequency output of the ultra wide band stepped frequency signal B be 0.5GHz~
2.5GHz, the Step Frequency Baseband subsystem frequency interval are 1MHz-10MHz, pulse duration 0.5us-5us.
In the disclosure some embodiments, the adjusting for passing through the quantity of local oscillator in the second level signal conditioning circuit is realized
The adjustment of the output bandwidth B.
In the disclosure some embodiments, the Step Frequency Baseband subsystem circuit includes sequentially connected DDS, first low
Bandpass filter and the first amplifier.
In the disclosure some embodiments, the first order signal conditioning circuit includes sequentially connected power splitter, two-way
First frequency mixer, the first bandpass filter of two-way, all the way high speed either-or switch SPDT and the second amplifier and two-way local oscillator
Signal LO1 and LO2 are connected respectively to the first frequency mixer of two-way, and the first frequency mixer of the two-way includes upper frequency mixer MIX1 and lower mixed
Frequency device MIX2, the local oscillation signal LO1 are connected to upper frequency mixer MIX1, and local oscillation signal LO2 is connected to down-conversion mixer MIX2.
In the disclosure some embodiments, the first order signal conditioning circuit receives the Step Frequency Baseband subsystem electricity
The Baseband subsystem B1 on road is separately input to by work(in the first frequency mixer of two-way, wherein：All the way with the local oscillation signal of LO1
It is mixed, the stepped frequency signal of B2 is chosen in output by the first bandpass filter all the way, wherein B2=LO1+B1；Another way
It is mixed with the local oscillator of LO2, the stepped frequency signal of B3 is chosen in output by the first bandpass filter of another way, wherein B3=
LO2+B1；It chooses the signal of B2 first by either-or switch, chooses the parts B3 at the end of the signal again, export stepped frequency signal
The stepped frequency signal of B4, wherein B4=B2+B3, frequency interval Δ f, pulse duration Ts。
In the disclosure some embodiments, the second level signal conditioning circuit includes sequentially connected five road local oscillation signal
LO3~LO7, high speed five selects a switch SP5T, third amplifier, the second low-pass filter, all the way the second frequency mixer MIX3 all the way
And the second bandpass filter all the way.
In the disclosure some embodiments, in the second level signal conditioning circuit, five select a switch SP5T choose LO3~
LO7 local oscillation signals are gradually mixed with the stepped frequency signal of B4 in the second frequency mixer, are chosen by the second bandpass filter following
The stepped frequency signal of band finally obtain bandwidth be B stepped frequency signal, wherein B=B5+B6+B7+B8+B9, frequency interval Δ f,
Pulse duration Ts。
In the disclosure some embodiments, when work, each chip clock source by same crystal oscillator by clock buffer come
It provides, the control data of DDS, local oscillation signal LO1~LO7 is written in corresponding register by microcontroller, then pass through control
DDS Step Frequencies output control bit starts the output of Step Frequency Baseband subsystem, while either-or switch SPDT and five selects a switch
SP5T starts gating signal, selects the local frequency of multiple frequency mixers, finally obtains step frequency output.
In the disclosure some embodiments, the frequency stepping radar signal source system generates stepping radar signal source
It is accomplished by the following way：
The channels either-or switch SPDT gating N1, five select a switch SP5T gatings M1 logical in (1) first DDS period F1
Road, DDS signals B1 enters upper frequency mixer MIX1 and is mixed with local oscillation signal LO1 in the period, exports stepped frequency signal B2, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO3 afterwards, obtains stepped frequency signal F1；
The channels either-or switch SPDT gating N2, five select a switch SP5T gatings M1 logical in (2) second DDS period F2
Road, DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in the period, exports stepped frequency signal B3, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO3 afterwards, obtains stepped frequency signal F2；
(3) channels either-or switch SPDT gating N1, five select a switch SP5T gatings M2 logical in third DDS period F3
Road, DDS signals B1 enters upper frequency mixer MIX1 and is mixed with the signal of local oscillation signal LO1 in the period, output Step Frequency letter
Number B2, then carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO4, obtains stepped frequency signal F3；
The channels either-or switch SPDT gating N2, five select a switch SP5T gatings M2 logical in (4) the 4th DDS period F4
Road, DDS signals B1 enters down-conversion mixer MIX2 and is mixed with the signal of local oscillation signal LO2 in the period, output Step Frequency letter
Number B3, then carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO4, obtains stepped frequency signal F4；
The channels either-or switch SPDT gating N1, five select a switch SP5T gatings M3 logical in (5) the 5th DDS period F5
Road, DDS signals B1 enters upper frequency mixer MIX1 and is mixed with local oscillation signal LO1 in the period, exports stepped frequency signal B2, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO5 afterwards, obtains stepped frequency signal F5；
The channels either-or switch SPDT gating N2, five select a switch SP5T gatings M3 logical in (6) the 6th DDS period F6
Road, DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in the period, exports stepped frequency signal B3, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO5 afterwards, obtains stepped frequency signal F6；
The channels either-or switch SPDT gating N1, five select a switch SP5T gatings M4 logical in (7) the 7th DDS period F7
Road, DDS signals B1 enters upper frequency mixer MIX1 and is mixed with local oscillation signal LO1 in the period, exports stepped frequency signal B2, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO6 afterwards, obtains stepped frequency signal F7；
The channels either-or switch SPDT gating N2, five select a switch SP5T gatings M4 logical in (8) the 8th DDS period F8
Road, DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in the period, exports stepped frequency signal B3, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO6 afterwards, obtains stepped frequency signal F8；
The channels either-or switch SPDT gating N1, five select a switch SP5T gatings M5 logical in (9) the 9th DDS period F9
Road, DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in the period, exports stepped frequency signal B2, so
It carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO7 afterwards, obtains stepped frequency signal F9；
The channels either-or switch SPDT gating N2, five select a switch SP5T gatings M5 logical in (10) the tenth DDS period F10
Road, DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in the period, exports stepped frequency signal B3, so
It carries out being mixed output in the second frequency mixer MIX3 with the signal of local oscillation signal LO7 afterwards, obtains stepped frequency signal F10.
(3) advantageous effect
It can be seen from the above technical proposal that disclosure frequency stepping radar signal source system at least has with following
One of beneficial effect：
(1) in the way of in the way of mixing compared to frequency multiplication, it is more convenient to be adjusted to frequency band；Compared to PLL frequencys multiplication, mixing
Mode can retain the fast feature of DDS frequency error factors；
(2) method for utilizing time domain joint, may be implemented multiple band combinations, effectively improves signal bandwidth；
(3) for big broadband signal, signal frequency is adjusted step by step using being mixed twice, compared to primary mixing, is kept away
The spuious more disadvantage of output signal is exempted from, while frequency adjustment is more convenient；
(4) the local oscillator quantity that can suitably adjust second level signal conditioning circuit, increases or decreases output signal bandwidth.
Description of the drawings
Fig. 1 is ultra wide band of the embodiment of the present invention, fast switching frequency stepping radar signal source circuit system structure diagram.
Fig. 2 is ultra wide band of the embodiment of the present invention, fast switching frequency stepping radar signal source broadband signal extension schematic diagram.
Specific implementation mode
Present disclose provides a kind of frequency stepping radar signal source systems.In the present invention, straight using one first
It connects digital frequency synthesizer and generates Step Frequency Baseband subsystem, it herein can be according to actual demand to frequency interval (1MHz-
10MHz), the pulse duration, (0.5us-5us) was adjusted, and was then passed through twice by frequency mixer, local oscillator, high-speed switch and filter
Wave device forms centre frequency and bandwidth successive adjustment of the signal conditioning circuit to Step Frequency Baseband subsystem.Finally obtain ultra wide band
Stepped frequency signal, and being switched fast for frequency may be implemented.In actual use, Millimeter Wave Stepped-Frequency High Resolution Radar transmitting terminal can be used as
Emit signal.
To make the purpose, technical scheme and advantage of the disclosure be more clearly understood, below in conjunction with specific embodiment, and reference
The disclosure is further described in attached drawing.
Disclosure some embodiments will be done with reference to appended attached drawing in rear and more comprehensively describe to property, some of but not complete
The embodiment in portion will be shown.In fact, the various embodiments of the disclosure can be realized in many different forms, and should not be construed
To be limited to this several illustrated embodiment；Relatively, these embodiments are provided so that the disclosure meets applicable legal requirement.
In first exemplary embodiment of the disclosure, a kind of ultra wide band, fast switching frequency stepping radar letter are provided
Number source system.Fig. 1 is the structural schematic diagram of first embodiment of the present disclosure stepped frequency radar signal source system.Fig. 2 is according to this
Inventive embodiments ultra wide band, fast switching frequency stepping radar signal source bandspreading schematic diagram.As shown in Figure 1 and Figure 2, the disclosure
Ultra wide band, fast switching frequency stepping radar signal source system include：Step Frequency Baseband subsystem circuit, first order signal condition electricity
Road and second level signal conditioning circuit.
Referring to Fig.1 and 2, being situated between below to each component part of the present embodiment stepped frequency radar signal source system
It continues：
(1) Step Frequency Baseband subsystem circuit
In the present embodiment, Step Frequency Baseband subsystem circuit includes sequentially connected DDS, the first low-pass filter and first
Amplifier.Step Frequency Baseband subsystem circuit is inputted by DDS as core, including clock, is used as the reference of DDS and follow-up system
Clock；DDS outputs filter out distally spuious by low-pass filter；By amplifier Regulate signal power.So far Step Frequency is exported
Baseband subsystem B1, frequency interval Δ f, pulse duration Ts。
(2) first order signal conditioning circuit
First order signal conditioning circuit includes sequentially connected power splitter, two-way the first frequency mixer the first bandpass filtering of two-way
Device, all the way high speed either-or switch SPDT and the second amplifier and two-way local oscillation signal LO1~LO2 are connected respectively to two-way
First frequency mixer, i.e. local oscillation signal LO1 are connected to upper frequency mixer MIX1, and local oscillation signal LO2 is connected to down-conversion mixer MIX2.Its
In, the Baseband subsystem B1 of upper level Step Frequency Baseband subsystem circuit is separately input to by work(in two-way frequency mixer, and one
Road is mixed with the local oscillation signal of LO1, and the stepped frequency signal of B2 (B2=LO1+B1) is chosen in output by bandpass filter, separately
It is mixed all the way with the local oscillator of LO2, the stepped frequency signal of B3 (B3=LO2+B1) is chosen in output by bandpass filter, then
It chooses the signal of B2 first by either-or switch, the parts B3 is chosen again at the end of the signal.So far output stepped frequency signal B4
(B4=B2+B3) stepped frequency signal, frequency interval Δ f, pulse duration Ts。
(3) second level signal conditioning circuit
Second level signal conditioning circuit includes sequentially connected five roads local oscillation signal LO3~LO7, high speed five selects one to open all the way
Close SP5T, third amplifier, the second low-pass filter, all the way the second frequency mixer and the second bandpass filter all the way.First five choosings
One switch SP5T chooses LO3~LO7 local oscillation signals, is then gradually mixed in frequency mixer with the stepped frequency signal of B4, passes through band
The stepped frequency signal that bandpass filter chooses lower sideband finally obtains the stepped frequency signal that bandwidth is B (B=B5+B6+B7+B8+B9),
Frequency interval Δ f, pulse duration Ts。
To provide the reference clock of DDS and follow-up system, stepped frequency radar signal source system further includes：
(4) clock circuit
The clock circuit includes crystal oscillator and clock buffer, for providing clock input to DDS, and simultaneously to LO1~
LO7 provides reference clock.
Incorporated by reference to Fig. 2, be explained below the present embodiment ultra wide band, fast switching frequency stepping radar signal source it is worked
Journey, it is specific as follows：
Road chip each first powers on simultaneously, including DDS, local oscillator, amplifier, high-speed switch and microcontroller.Each chip clock
Source is provided by same crystal oscillator by clock buffer, and following microcontroller the control data of DDS, PLL is written corresponding
In register, then start the output of Step Frequency Baseband subsystem, while high-speed switch by controlling DDS Step Frequencies output control bit
Start gating signal, select the local frequency of frequency mixer, finally obtains step frequency output.
SPDT gates N1 channels, the channels SP5T gating M1 in (1) first DDS period F1, in the period DDS signals B1 into
Enter upper frequency mixer MIX1 to be mixed with the signal of LO1, export the stepped frequency signal of B2, then with the signal of LO3 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F1.
SPDT gates N2 channels, the channels SP5T gating M1 in (2) second DDS period F2, in the period DDS signals B1 into
Enter down-conversion mixer MIX2 to be mixed with the signal of LO2, export the stepped frequency signal of B3, then with the signal of LO3 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F2.
(3) SPDT gates N1 channels, the channels SP5T gating M2 in third DDS period F3, in the period DDS signals B1 into
Enter upper frequency mixer MIX1 to be mixed with the signal of LO1, export the stepped frequency signal of B2, then with the signal of LO4 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F3.
SPDT gates N2 channels, the channels SP5T gating M2 in (4) the 4th DDS period F4, in the period DDS signals B1 into
Enter down-conversion mixer MIX2 to be mixed with the signal of LO2, export the stepped frequency signal of B3, then with the signal of LO4 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F4.
SPDT gates N1 channels, the channels SP5T gating M3 in (5) the 5th DDS period F5, in the period DDS signals B1 into
Enter upper frequency mixer MIX1 to be mixed with the signal of LO1, export the stepped frequency signal of B2, then with the signal of LO5 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F5.
SPDT gates N2 channels, the channels SP5T gating M3 in (6) the 6th DDS period F6, in the period DDS signals B1 into
Enter down-conversion mixer MIX2 to be mixed with the signal of LO2, export the stepped frequency signal of B3, then with the signal of LO5 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F6.
SPDT gates N1 channels, the channels SP5T gating M4 in (7) the 7th DDS period F7, in the period DDS signals B1 into
Enter upper frequency mixer MIX1 to be mixed with the signal of LO1, export the stepped frequency signal of B2, then with the signal of LO6 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F7.
SPDT gates N2 channels, the channels SP5T gating M4 in (8) the 8th DDS period F8, in the period DDS signals B1 into
Enter down-conversion mixer MIX2 to be mixed with the signal of LO2, export the stepped frequency signal of B3, then with the signal of LO6 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F8.
SPDT gates N1 channels, the channels SP5T gating M5 in (9) the 9th DDS period F9, in the period DDS signals B1 into
Enter down-conversion mixer MIX2 to be mixed with the signal of LO2, export the stepped frequency signal of B2, then with the signal of LO7 in frequency mixer
Mixing output is carried out in MIX3, obtains the stepped frequency signal of F9.
SPDT gates the channels N2, the channels SP5T gating M5, DDS signals B1 in the period in (10) the tenth DDS period F10
It is mixed into down-conversion mixer MIX2 with the signal of LO2, exports the stepped frequency signal of B3, be then mixed with the signal of LO7
Mixing output is carried out in device MIX3, obtains the stepped frequency signal of F10.
Actual test proves, ultra wide band that the present embodiment generates, fast switching frequency stepping radar signal source output frequency model
It encloses for 0.5GHz~2.5GHz；Frequency interval 5MHz；Share 400 frequency points；Switch speed between frequency is up to 100ns；One
The frequency sweep cycle time is 800us；Output signal flatness is stablized within 5dB.
So far, first embodiment of the present disclosure stepped frequency radar signal source system introduction finishes.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art
Should have to ultra wide band of the present invention, fast switching frequency stepping radar signal source and clearly recognize.
In addition, the above-mentioned output valve to various pieces, is not limited in various concrete numerical values, the shape mentioned in embodiment
Shape, those of ordinary skill in the art simply can be substituted or replaced to it, such as：
The signal source of signal generator or other same frequency band can be used to replace for the parts DDS, and can also adjust single-frequency point
Duration and frequency hopping step-length, meet different scanning rates and want demand.
The control function of single chip part can also select FPGA to realize.
Signal source output terminal can add amplifier and numerical-control attenuator, convenient to be adjusted to output power signal, from
And meet different application demand.
The local oscillator quantity in the signal conditioning circuit of the second level can suitably be increased and adjust bandpass filter range, such as when
When increasing local oscillation signal all the way, output frequency may make to be increased to 0.5GHz~3GHz；When reducing local oscillation signal all the way, can make
Obtaining output frequency becomes 0.5GHz~2.0GHz.
It should also be noted that, the direction term mentioned in embodiment, for example, "upper", "lower", "front", "rear", " left side ",
" right side " etc. is only the direction of refer to the attached drawing, not is used for limiting the protection domain of the disclosure.Through attached drawing, identical element by
Same or similar reference numeral indicates.When that understanding of this disclosure may be caused to cause to obscure, conventional structure will be omitted
Or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present disclosure
Content.In addition, in the claims, any reference mark between bracket should not be configured to the limit to claim
System.
It unless there are known entitled phase otherwise anticipates, the numerical parameter in this specification and appended claims is approximation, energy
Enough required characteristic changings according to as obtained by content of this disclosure.Specifically, all be used in specification and claim
The number of the middle content for indicating composition, reaction condition etc., it is thus understood that repaiied by the term of " about " in all situations
Decorations.Under normal circumstances, the meaning expressed refers to including by specific quantity ± 10% variation in some embodiments, at some
± 5% variation in embodiment, ± 1% variation in some embodiments, in some embodiments ± 0.5% variation.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.Before element
Word "a" or "an" does not exclude the presence of multiple such elements.
The word of specification and ordinal number such as " first ", " second ", " third " etc. used in claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Sequence in sequence or manufacturing method, the use of those ordinal numbers are only used for enabling the element with certain name and another tool
There is the element of identical name that can make clear differentiation.
In addition, unless specifically described or the step of must sequentially occur, there is no restriction in the above institute for the sequence of above-mentioned steps
Row, and can change or rearrange according to required design.And above-described embodiment can be based on the considerations of design and reliability, that
This mix and match is used using or with other embodiment mix and match, i.e., the technical characteristic in different embodiments can be freely combined
Form more embodiments.
Algorithm and display be not inherently related to any certain computer, virtual system or miscellaneous equipment provided herein.
Various general-purpose systems can also be used together with teaching based on this.As described above, it constructs required by this kind of system
Structure be obvious.In addition, the disclosure is not also directed to any certain programmed language.It should be understood that can utilize various
Programming language realizes content of this disclosure described here, and the description done above to language-specific is to disclose this public affairs
The preferred forms opened.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in the one or more equipment different from the embodiment.It can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it may be used any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit requires, abstract and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
It replaces.Also, in the unit claims listing several devices, several in these devices can be by same hard
Part item embodies.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect,
Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect
The disclosure of shield requires features more more than the feature being expressly recited in each claim.More precisely, as following
Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific implementation mode are expressly incorporated in the specific implementation mode, wherein each claim itself
All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out further in detail the purpose, technical solution and advantageous effect of the disclosure
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the disclosure, is not limited to the disclosure, it is all
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (10)
1. a kind of frequency stepping radar signal source system, including：
Step Frequency Baseband subsystem circuit exports Step Frequency Baseband subsystem B1,
First order signal conditioning circuit exports stepped frequency signal B4, and
Second level signal conditioning circuit is mixed with the stepped frequency signal of B4 in frequency mixer, in Step Frequency Baseband subsystem
Frequency of heart and bandwidth successive adjustment, output bandwidth are the ultra wide band stepped frequency signal of B；
Wherein, the first order signal conditioning circuit and second level signal conditioning circuit include frequency mixer, local oscillator, high-speed switch
And filter.
2. frequency stepping radar signal source system according to claim 1, the ultra wide band stepped frequency signal B's is defeated
It is 0.5GHz~2.5GHz to go out frequency range, and the Step Frequency Baseband subsystem frequency interval is 1MHz-10MHz, pulse persistance
Time is 0.5us-5us.
3. frequency stepping radar signal source system according to claim 2 passes through second level signal condition electricity
The adjustment of the output bandwidth B is realized in the adjusting of the quantity of local oscillator in road.
4. frequency stepping radar signal source system according to claim 1, the Step Frequency Baseband subsystem circuit
Including sequentially connected DDS, the first low-pass filter and the first amplifier.
5. frequency stepping radar signal source system according to claim 4, the first order signal conditioning circuit packet
Include sequentially connected power splitter, the first frequency mixer of two-way, the first bandpass filter of two-way, all the way high speed either-or switch SPDT and
Second amplifier and two-way local oscillation signal LO1 and LO2 are connected respectively to the first frequency mixer of two-way, and the two-way first is mixed
Device includes that upper frequency mixer MIX1 and down-conversion mixer MIX2, the local oscillation signal LO1 are connected to upper frequency mixer MIX1, local oscillation signal
LO2 is connected to down-conversion mixer MIX2.
6. frequency stepping radar signal source system according to claim 5, the first order signal conditioning circuit connect
The Baseband subsystem B1 for receiving the Step Frequency Baseband subsystem circuit is separately input to by work(in the first frequency mixer of two-way,
Wherein：
It being mixed all the way with the local oscillation signal of LO1, the stepped frequency signal of B2 is chosen in output by the first bandpass filter all the way,
Wherein, B2=LO1+B1；
Another way is mixed with the local oscillator of LO2, and the stepped frequency signal of B3 is chosen in output by the first bandpass filter of another way,
Wherein, B3=LO2+B1；
It chooses the signal of B2 first by either-or switch, chooses the parts B3, output stepped frequency signal B4 at the end of the signal again
Stepped frequency signal, wherein B4=B2+B3, frequency interval Δ f, pulse duration Ts。
7. frequency stepping radar signal source system according to claim 5, the second level signal conditioning circuit packet
It includes sequentially connected five roads local oscillation signal LO3~LO7, five select a switch SP5T, third amplifier, the second low pass filtered at a high speed all the way
Wave device, all the way the second frequency mixer MIX3 and all the way the second bandpass filter.
8. frequency stepping radar signal source system according to claim 7, in the second level signal conditioning circuit,
Five select a switch SP5T to choose LO3~LO7 local oscillation signals, are gradually mixed in the second frequency mixer with the stepped frequency signal of B4
Frequently, the stepped frequency signal that lower sideband is chosen by the second bandpass filter finally obtains the stepped frequency signal that bandwidth is B, wherein B
=B5+B6+B7+B8+B9, frequency interval Δ f, pulse duration Ts。
9. frequency stepping radar signal source system according to claim 7, when work, each chip clock source passes through same
One crystal oscillator is provided by clock buffer, and the control data of DDS, local oscillation signal LO1~LO7 are written accordingly by microcontroller
In register, then start the output of Step Frequency Baseband subsystem by controlling DDS Step Frequencies output control bit, while alternative is opened
Closing SPDT and five selects a switch SP5T to start gating signal, selects the local frequency of multiple frequency mixers, finally obtains step frequency
Output.
10. frequency stepping radar signal source system according to any one of claims 7 to 9, the frequency stepping body
Radar signal source system processed generates stepping radar signal source and is accomplished by the following way：
The channels either-or switch SPDT gating N1, five select the channels switch SP5T gating M1 in (1) first DDS period F1, should
DDS signals B1 enters upper frequency mixer MIX1 and is mixed with local oscillation signal LO1 in period, export stepped frequency signal B2, then with
Local oscillation signal LO3 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F1；
The channels either-or switch SPDT gating N2, five select the channels switch SP5T gating M1 in (2) second DDS period F2, should
DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in period, export stepped frequency signal B3, then with
Local oscillation signal LO3 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F2；
(3) channels either-or switch SPDT gating N1, five select the channels switch SP5T gating M2 in third DDS period F3, should
DDS signals B1 enters upper frequency mixer MIX1 and is mixed with the signal of local oscillation signal LO1 in period, exports stepped frequency signal B2,
Then it carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO4, obtains stepped frequency signal F3；
The channels either-or switch SPDT gating N2, five select the channels switch SP5T gating M2 in (4) the 4th DDS period F4, should
DDS signals B1 enters down-conversion mixer MIX2 and is mixed with the signal of local oscillation signal LO2 in period, exports stepped frequency signal B3,
Then it carries out being mixed output in the second frequency mixer MIX3 with local oscillation signal LO4, obtains stepped frequency signal F4；
The channels either-or switch SPDT gating N1, five select the channels switch SP5T gating M3 in (5) the 5th DDS period F5, should
DDS signals B1 enters upper frequency mixer MIX1 and is mixed with local oscillation signal LO1 in period, export stepped frequency signal B2, then with
Local oscillation signal LO5 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F5；
The channels either-or switch SPDT gating N2, five select the channels switch SP5T gating M3 in (6) the 6th DDS period F6, should
DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in period, export stepped frequency signal B3, then with
Local oscillation signal LO5 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F6；
The channels either-or switch SPDT gating N1, five select the channels switch SP5T gating M4 in (7) the 7th DDS period F7, should
DDS signals B1 enters upper frequency mixer MIX1 and is mixed with local oscillation signal LO1 in period, export stepped frequency signal B2, then with
Local oscillation signal LO6 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F7；
The channels either-or switch SPDT gating N2, five select the channels switch SP5T gating M4 in (8) the 8th DDS period F8, should
DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in period, export stepped frequency signal B3, then with
Local oscillation signal LO6 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F8；
The channels either-or switch SPDT gating N1, five select the channels switch SP5T gating M5 in (9) the 9th DDS period F9, should
DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in period, export stepped frequency signal B2, then with
Local oscillation signal LO7 carries out mixing output in the second frequency mixer MIX3, obtains stepped frequency signal F9；
The channels either-or switch SPDT gating N2, five select the channels switch SP5T gating M5 in (10) the tenth DDS period F10,
DDS signals B1 enters down-conversion mixer MIX2 and is mixed with local oscillation signal LO2 in the period, exports stepped frequency signal B3, then
It carries out in the second frequency mixer MIX3 being mixed output with the signal of local oscillation signal LO7, obtains stepped frequency signal F10.
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