CN108169742A - Wideband adaptive frequency-tracking system and method - Google Patents
Wideband adaptive frequency-tracking system and method Download PDFInfo
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- CN108169742A CN108169742A CN201810009339.6A CN201810009339A CN108169742A CN 108169742 A CN108169742 A CN 108169742A CN 201810009339 A CN201810009339 A CN 201810009339A CN 108169742 A CN108169742 A CN 108169742A
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- 238000000034 method Methods 0.000 title claims abstract description 27
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- 238000005259 measurement Methods 0.000 claims abstract description 80
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- 238000007781 pre-processing Methods 0.000 claims description 12
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/66—Radar-tracking systems; Analogous systems
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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
- G01S7/285—Receivers
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Abstract
The present invention provides a kind of wideband adaptive frequency-tracking system and method, including：Instantaneous frequency measurement module for carrying out frequency measurement to the transmitting pulse signal received, obtains frequency code；Memory module, for storing frequencies code and the incidence relation table of control code；Control code generation module is connect respectively with instantaneous frequency measurement module and memory module, for the frequency code measured according to instantaneous frequency measurement module, is tabled look-up from memory module and is generated control code；Frequency synthesizing module is connect with control code generation module, and the control code for being generated according to control code generation module generates local oscillation signal.In its each repetition period in transmitting pulse signal, practical intermediate-freuqncy signal after radar receiver mixing is all in optimization process frequency band, realize the adaptive fast frequency following function for receiving local oscillation signal to emitting pulse signal, ensure receiver performance not by tranmitting frequency drift effect, it is ensured that the tactical qualities of radar complete machine.
Description
Technical field
The present invention relates to Radar Technology field more particularly to a kind of wideband adaptive frequency-tracking system and methods.
Background technology
Magnetron is a kind of electron tube for being used for generating microwave energy, is widely used in guiding, fire control, surveys high, airborne, warship
In the various radars such as load, meteorology.Its operation principle be in pipe electronics in the control of orthogonal stationary magnetic field and steady electric field
Under, it interacts with electromagnetic field of high frequency, energy conversion is obtained from steady electric field into microwave energy, so as to generate microwave
Energy.Wherein, the working pulse width of pulsed magnetron can change in the range of 0.004~60 μ s (microsecond), operating frequency range
Between 250MHz (megahertz) to 120GHz (girz), pulse power from tens watts to tens megawatt, efficiency up to 70%,
Service life is up to tens of thousands of hours.
But because of its own system reason, exist when magnetron transmitter works by preheating drift, temperature drift, load
Frequency drift caused by the reasons such as variation, causes magnetron frequency accuracy poor, and is influenced to become by factors such as time, environment
Change larger so that the practical intermediate-freuqncy signal after receiver mixing deviates setting intermediate frequency, it is impossible in optimization process frequency band, directly
Influence the tactical qualities of radar complete machine.
Invention content
The object of the present invention is to provide a kind of wideband adaptive frequency-tracking system and methods, effectively solve in the prior art
The technical issues of intermediate-freuqncy signal after receiver mixing is caused to deviate by the frequency drift of magnetron transmitter.
In order to solve the above technical problem, the present invention provides technical solution it is as follows：
A kind of wideband adaptive frequency-tracking system, including：
Instantaneous frequency measurement module for carrying out frequency measurement to the transmitting pulse signal received, obtains frequency code；
Memory module, for storing frequencies code and the incidence relation table of control code；
Control code generation module is connect respectively with instantaneous frequency measurement module and memory module, for according to instantaneous frequency measurement module
The frequency code measured tables look-up from memory module and generates control code；
Frequency synthesizing module is connect with the control code generation module, for the control generated according to control code generation module
Code processed generates local oscillation signal.
In the technical program, instantaneous frequency measurement module carries out frequency measurement to transmitting pulse signal in transmitting pulse front edge and obtains frequency
Rate code, and then control code generation module is generated according to obtained frequency code by the incidence relation table of memory module storage inside
Control code, the control frequency synthesizing module output required local oscillation signal of radar receiver, with this in the every of transmitting pulse signal
In a repetition period, the practical intermediate-freuqncy signal after radar receiver mixing is realized all in optimization process frequency band and receives local oscillator
Signal ensures receiver performance not by tranmitting frequency drift effect, really to the adaptive fast frequency following function of echo-signal
Protect the tactical qualities of radar complete machine.
It is further preferred that the pretreatment mould being connect with the instantaneous frequency measurement module is further included in the frequency-tracking system
Block carries out pretreatment operation, and pretreated transmitting pulse signal is sent to the wink for receiving transmitting pulse signal
When frequency measurement module.
It is further preferred that the frequency code that the control code generation module is measured according to instantaneous frequency measurement module, from storage mould
It tables look-up in block and generates parallel control code；The frequency synthesizing module is given birth to according to the parallel control code that control code generation module generates
Into local oscillation signal.
In the technical program, in order to improve system response speed, control code generation module generation parallel control code, with this
Frequency synthesizing module generation local oscillation signal is controlled, shortens data transmission period.
It is further preferred that the control code generation module for FPGA (Field Programmable Gate Array,
That is field programmable gate array) circuit, the frequency code that the FPGA circuitry is measured according to instantaneous frequency measurement module, from memory module
It tables look-up and generates control code.
It is further preferred that the frequency synthesizing module includes：
DDS, the control code for being generated according to control code generation module generate the output signal in the range of predeterminated frequency；
Frequency multiplier is connect with the DDS, and the output signal for being generated to DDS carries out frequency multiplication and operates to obtain local oscillation signal.
The present invention also provides a kind of wideband adaptive frequency tracking method, including：
Receive transmitting pulse signal；
Frequency measurement is carried out to the transmitting pulse signal received, obtains frequency code；
Control code is generated according to the frequency code measured, the frequency code is associated with control code；
Local oscillation signal is generated according to the control code of generation.
In the technical program, instantaneous frequency measurement module carries out frequency measurement to transmitting pulse signal in pulse front edge and obtains frequency
Code, and then control code generation module generates control according to obtained frequency code by the incidence relation table of memory module storage inside
Code processed, the control frequency synthesizing module output required local oscillation signal of radar receiver, with this in each of transmitting pulse signal
In repetition period, for the practical intermediate-freuqncy signal after radar receiver mixing all in optimization process frequency band, realization receives local oscillator letter
Number to the adaptive fast frequency following function of echo-signal, ensure receiver performance not by tranmitting frequency drift effect, it is ensured that
The tactical qualities of radar complete machine.
It is further preferred that it is further included after transmitting pulse signal is received：It is carried out in advance to receiving transmitting pulse signal
Processing operation.
It is further preferred that in control code is generated according to the frequency code measured, specially：It is given birth to according to the frequency code measured
Into parallel control code；
In local oscillation signal is generated according to the control code of generation, specially：Local oscillator is generated according to the parallel control code of generation
Signal.
In the technical program, in order to improve system response speed, generation local oscillation signal is controlled by parallel control code, it is short
Data transmission period.
It is further preferred that in being tabled look-up according to the frequency code measured and generating control code, specially：FPGA circuitry according to
The frequency code measured is tabled look-up the control code that is associated in storage inside.
It is further preferred that in local oscillation signal is generated according to the control code of generation, including：
Output signal in the range of predeterminated frequency is generated according to control code；
Frequency multiplication is carried out to output signal to operate to obtain local oscillation signal.
Description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, to above-mentioned characteristic, technical characteristic,
Advantage and its realization method are further described.
Fig. 1 is a kind of embodiment schematic diagram of frequency tracking system in the present invention；
Fig. 2 is frequency tracking system another embodiment schematic diagram in the present invention；
Fig. 3 is preprocessing module schematic diagram in the present invention；
Fig. 4 is instantaneous frequency measurement module diagram in the present invention；
Fig. 5 is frequency synthesizing module schematic diagram in the present invention；
Fig. 6 is frequency tracking method flow diagram in the present invention.
Drawing reference numeral explanation：
100- frequency-tracking systems, 110- instantaneous frequency measurement modules, 120- memory modules, 130- control code generation modules,
140- frequency synthesizing modules, 150- preprocessing modules, 151- limiters, 152- wave filters, 153- low-noise amplifiers, 154- temperature
Spend compensated attenuator, 141-DDS, 142- second filters, 143- frequency multipliers, 144- amplifiers.
Specific embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The specific embodiment of the present invention.It should be evident that the accompanying drawings in the following description is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically shown in each figure, their not generations
Its practical structures as product of table.
By the system reason of magnetron transmitter itself, when work, can cause frequency drift because of a variety of causes, cause magnetic control
Pipe tranmitting frequency low precision, the problem of influenced to change greatly by factors such as time, environment, therefore the present invention provides a kind of completely new
Wideband adaptive frequency-tracking system, it is ensured that the local oscillation signal of reception tracks work(to the adaptive fast frequency for emitting pulse signal
Energy.As shown in Figure 1, in one embodiment, which includes：Instantaneous frequency measurement module 110, storage mould
Block 120, control code generation module 130 and frequency synthesizing module 140, wherein, control code generation module 130 is surveyed respectively with instantaneous
Frequency module 110 and memory module 120 connect, and frequency synthesizing module 140 is connect with control code generation module 130.
During the work time, after the transmitting pulse signal for receiving magnetron transmitter coupling output, pass through wink immediately
When frequency measurement module 110 frequency measurement carried out to it obtain frequency code；The frequency that control code generation module 130 is obtained according to measurement later
Code is tabled look-up to obtain and generate control code in the incidence relation table of 120 storage inside of memory module, controls frequency synthesis mould
Block 140 exports the required local oscillation signal of radar receiver.Specifically, if the transmitting pulse signal that magnetron transmitter generates generates
Frequency drift, then frequency synthesizing module 140 offset for emitting pulse signal frequency is adjusted to obtain according to control code
Local oscillation signal is realized the adaptive fast frequency following function for receiving local oscillation signal to emitting pulse signal with this, ensures radar
Receiver works normally.
In the present embodiment, the incidence relation table of frequency code and control code is stored in advance in memory module 120.In reality
In the application of border, the incidence relation table between frequency code and control code is determined by the performance of radar itself.In general, fLO=fT±
fIF, wherein, fLOFor receiver local frequency, fTFor transmitter carrier frequency, fIFFor receiver intermediate frequency center frequency, receiver
Local frequency according to needed for the transmitting pulse signal received by frequency tuning to itself, in order to ensure to emit pulse signal
Frequency code presets the incidence relation between frequency code and control code with this without departing from the frequency-tracking range of receiver
Table, specifically, when transmitting pulse signal frequency code without departing from receiver frequency-tracking range, then without adjustment, directly
Generation control code is exported；When frequency-tracking range of the frequency code beyond receiver for emitting pulse signal, then frequency is fitted
When adjustment after generation control code exported.
By the frequency-tracking system be applied to radar in, can quickly tracking measurement transmitting pulse signal carrier frequency, and quickly
Frequency signal corresponding with transmitting signal carrier frequency is generated, frequency-tracking precision reaches 0.5MHz (r.m.s), and the frequency-tracking time is less than
0.7 μ s (frequency-tracking time=instantaneous frequency measurement module frequency measurement time+frequency synthesizing module puts the frequency time), instantaneous bandwidth of operation compared with
Width, up to hundreds of megahertzs to several girz.Realize the adaptive fast frequency for receiving local oscillation signal to emitting pulse signal
Following function solves the problems, such as that tracking failure occurs in automatic frequency control apparatus in the prior art, it is ensured that emit pulse signal
The frequency of the local oscillation signal of each repetition period inner receiver is corresponding with the carrier frequency of the transmitting pulse signal of the repetition period
Relationship is correct, ensures that the echo-signal of each pulse repetition period can be normally carried out reception processing, receiver performance with this
Not by tranmitting frequency drift effect, it is ensured that the tactical qualities of radar complete machine.
The above embodiment is improved to obtain present embodiment, in the present embodiment, control code uses parallel
Mode controls frequency synthesizing module 140 to generate local oscillation signal.During the work time, preprocessing module 150 receives magnetron hair
It penetrates after the transmitting pulse signal of machine transmission, pretreatment operation is carried out to it immediately, including amplitude limit, filtering, low noise amplification etc.
Processing inhibits high-power RF signal with this, protects late-class circuit, improves frequency measurement accuracy.Instantaneous frequency measurement module 110 is right later
Pretreated transmitting pulse signal carries out frequency measurement and obtains frequency code；Then control code generation module 130 is obtained according to measurement
Frequency code is tabled look-up to obtain and generates parallel control code in the incidence relation table of 120 storage inside of memory module, control frequency
Rate integration module 140 exports the required local oscillation signal of radar receiver, improves efficiency.
The above embodiment is improved to obtain present embodiment, in the present embodiment, as shown in Fig. 2, the frequency
It is comprehensive in addition to including instantaneous frequency measurement module 110, memory module 120, control code generation module 130 and frequency in tracking system 100
It molds except block 140, further includes the preprocessing module 150 being connect with instantaneous frequency measurement module 110, emit pulse signal for receiving
Pretreatment operation is carried out, and pretreated transmitting pulse signal is sent to instantaneous frequency measurement module 110.
During the work time, after preprocessing module 150 receives the transmitting pulse signal of magnetron transmitter transmission, with
Pretreatment operation is carried out to it, including processing such as amplitude limit, filtering, low noise amplifications, high-power RF signal is inhibited with this, is protected
Late-class circuit is protected, improves frequency measurement accuracy.Instantaneous frequency measurement module 110 carries out frequency measurement to pretreated transmitting pulse signal later
Obtain frequency code；Then the frequency code that control code generation module 130 is obtained according to measurement, in 120 storage inside of memory module
It is tabled look-up to obtain and generate control code in incidence relation table, control frequency synthesizing module 140 is exported required for radar receiver
Local oscillation signal.
In the above-described embodiment, as shown in figure 3, receiving front-end is main in the preprocessing module 150 (receiving front-end)
It is made of limiter 151, first filter 152, low-noise amplifier 153, temperature compensation attenuator 154 etc., wherein, limiter
For high-power RF signal protection late-class circuit to be inhibited not to be burned out；First filter for inhibit except radar transmitter frequency it
Outer interference signal improves frequency measurement accuracy；Low-noise amplifier is used to carry out low noise amplification, temperature to transmitting pulse signal
Compensated attenuator is used to compensate channel gain variation caused by temperature change.
As shown in figure 4, pass through work(point, delay line, adder in instantaneous frequency measurement module 110 (broadband instantaneous frequency measurement receiver)
And square-law detector forms the auto-correlation function of signal, then by calculating signal frequency than phase method, realizes to width input frequency
The transmitting pulse signal of rate range carries out quick, high-precision frequency measurement.Specifically, the instantaneous frequency measurement module by power splitter, prolong
The compositions such as slow line, I/Q frequency mixers, A/D converters, frequency measuring block, wherein, four power splitters are divided into pulse signal work(is emitted
Four tunnels；By the transmitting pulse signal after four work(point, work(is divided into two-way to two power splitters again, leads directly to connect with I/Q frequency mixers all the way, and one
The delayed line in road is connect with I/Q frequency mixers, is converted to I/Q two paths of signals, and enter double channel A/D converters；Four tunnel binary channels
A/D converters send frequency measuring block after high-speed sampling, quantization are carried out to i/q signal respectively；Frequency measuring block completes transmitting
The frequency measurement of pulse signal, output frequency code.During the work time, pass through power splitter (above-mentioned two power splitter and four centimeters of devices)
Transmitting pulse signal after will be pretreated is divided into eight tunnel radiofrequency signals, wherein, four tunnels difference I/Q frequency mixers (autocorrelator)
One end, another four tunnel are sent to the other end of autocorrelator by delay line respectively, after four I/Q frequency mixers are handled, export eight tunnels
IQ vision signals.Later, double channel A/D converters reflect to four channels after carrying out AD samplings to the IQ vision signals of input
Phase, temperature correction, 1:4:16:14 bit frequency codes are generated after 64 schools code and splicing and correlated condition code is exported.
As shown in figure 5, mainly by DDS141 (Direct in frequency synthesizing module 140 (direct frequency synthesis synthesizer)
Digital Synthesizer, Direct Digital Frequency Synthesizers), second filter 142, frequency multiplier 143, the groups such as amplifier 144
Into, frequency switching time it is fast, it is small, mutually make an uproar.Specifically, DDS input reference clock signals are 1.2GHz, output frequency
The upper limit is 600MHz, and 50MHz~450MHz is selected in engineer application, puts the frequency time less than 500ns.DDS receives control code
After the control code that generation module 130 exports, output signal of the frequency between 50MHz~450MHz is generated；Second filter
DDS output signals are filtered, filtering clutter signal；DDS output signals are carried out process of frequency multiplication, extension output frequency by frequency multiplier
Rate range generates local oscillation signal needed for radar；Amplifier carries out power amplification to signal so that local oscillation signal power meets radar
Receiver requirement.
In one example, above-mentioned instantaneous frequency measurement module 110 is wideband digital instantaneous frequency measurement receiver, and memory module 120 is
ROM (Read-only Memory) memory, control code generation module 130 are obtained by FPGA circuitry, and frequency synthesizing module 140 is
Directly synthesize formula frequency synthesizer.During the work time, receiving front-end (preprocessing module) to transmitting pulse signal carry out amplitude limit,
After the processing such as filtering, low noise amplification, wideband digital instantaneous frequency measurement receiver carries out pretreated transmitting pulse signal
Fast speed real-time measurement exports the frequency code of the transmitting pulse signal of radar emission；Later, it is given birth to by the control code that FPGA circuitry obtains
The frequency code exported into module according to wideband digital instantaneous frequency measurement receiver is tabled look-up by ROM memory and generates control code, and root
The direct frequency synthesis synthesizer output required local oscillation signal of radar receiver is controlled according to the control code.
In this example, it applies on naval's type radar, radar working band is 9.5GHz~11.5GHz.It is working
In the process, the frequency range of the transmitting pulse signal of frequency-tracking system input is 9.5GHz~11.5GHz, input power range
For -30dBm~10dBm；The frequency-measurement accuracy of wideband digital instantaneous frequency measurement receiver is better than 0.5MHz (r.m.s), and the frequency measurement time is excellent
In 200ns, adaptation pulse width is 0.1 μ s~CW.The local oscillation signal frequency range of system output is 16GHz~18GHz, frequency
Stepping is 1MHz, puts the frequency time≤500ns, puts frequency precision≤10KHz, frequency stability 5ppm, output power >=0 ±
2dBm。
The present invention also provides a kind of wideband adaptive frequency tracking method, as shown in figure 5, in the frequency tracking method
Including：S10 receives transmitting pulse signal；S20 carries out frequency measurement to the transmitting pulse signal received, obtains frequency code；S30
Control code is generated according to the frequency code measured, frequency code is associated with control code；S40 generates local oscillator letter according to the control code of generation
Number.
During the work time, after receiving transmitting pulse signal, frequency code is obtained by carrying out frequency measurement to it immediately；It
The frequency code obtained afterwards according to measurement, is tabled look-up to obtain and generate control code in the incidence relation table of storage inside, is controlled
It generates and exports the required local oscillation signal of radar receiver.Specifically, if the transmitting pulse signal production that magnetron transmitter generates
Frequency drift has been given birth to, then the offset for emitting pulse signal frequency has been adjusted to obtain local oscillation signal according to control code, with this
It realizes the adaptive fast frequency following function for receiving local oscillation signal to emitting pulse signal, ensures the normal work of radar receiver
Make.Specifically, if the transmitting pulse signal that magnetron transmitter generates produces frequency drift, according to control code to emitting pulse
The offset of signal frequency is adjusted to obtain local oscillation signal, is realized with this and receives local oscillation signal to the adaptive of transmitting pulse signal
Fast frequency following function is answered, ensures radar receiver normal work.
In the present embodiment, the incidence relation table of frequency code and control code is stored in advance.In practical applications, frequency
Incidence relation table between rate code and control code is determined by the performance of radar itself, which is applied to radar
In, quickly it can emit the carrier frequency of pulse signal by tracking measurement, and quickly generate frequency signal corresponding with transmitting signal carrier frequency, frequency
Rate tracking accuracy reaches 0.5MHz (r.m.s), and the frequency-tracking time is less than 0.7 μ s, realizes and receives local oscillation signal to transmitting pulse letter
Number adaptive fast frequency following function, ensure receiver performance not by tranmitting frequency drift effect, it is ensured that radar complete machine
Tactical qualities.
The above embodiment is improved to obtain present embodiment, in the present embodiment, control code uses parallel
Mode controls generation local oscillation signal.During the work time, after receiving transmitting pulse signal, immediately by carrying out frequency measurement to it
Obtain frequency code；The frequency code obtained later according to measurement, is tabled look-up to obtain and be given birth in the incidence relation table of storage inside
Into parallel control code, control generates and exports the required local oscillation signal of radar receiver.
The above embodiment is improved to obtain present embodiment, in the present embodiment, in the frequency tracking method
Including：Receive transmitting pulse signal；Pretreatment operation is carried out to receiving transmitting pulse signal；The transmitting pulse received is believed
Number carry out frequency measurement, obtain frequency code；Control code is generated according to the frequency code measured, frequency code is associated with control code；According to
The control code generation local oscillation signal of generation.
During the work time, after the transmitting pulse signal for receiving magnetron transmitter transmission, it is carried out immediately pre-
Processing operation including processing such as amplitude limit, filtering, low noise amplifications, inhibits high-power RF signal and other frequency interferences with this
Signal protects late-class circuit, improves frequency measurement accuracy.Frequency measurement is carried out to pretreated transmitting pulse signal later and obtains frequency
Code；Then according to the frequency code that measurement obtains, tabled look-up to obtain and generate control code in the incidence relation table of storage inside,
Control generates and exports the required local oscillation signal of radar receiver.
Specifically, in the above-described embodiment, it is carried out in advance by a preprocessing module to receiving transmitting pulse signal
Reason operation, receiving front-end is mainly by limiter, first filter, low noise amplification in the preprocessing module (receiving front-end)
The compositions such as device, temperature compensation attenuator, wherein, limiter protects late-class circuit not burnt for inhibiting high-power RF signal
It ruins；First filter improves frequency measurement accuracy for inhibiting the interference signal in addition to radar transmitter frequency；Low-noise amplifier
For carrying out low noise amplification to transmitting pulse signal, temperature compensation attenuator is used to become channel gain caused by temperature change
Change compensates.
The transmitting pulse signal received is surveyed into line frequency by an instantaneous frequency measurement module (broadband instantaneous frequency measurement receiver)
Amount, specifically, the instantaneous frequency measurement module form the auto-correlation letter of signal by work(point, delay line, adder and square-law detector
Number, then by calculating signal frequency than phase method, realize quick, high-precision to the transmitting pulse signal progress of wide input frequency range
The frequency measurement of degree.Specifically, the instantaneous frequency measurement module is by power splitter, delay line, I/Q frequency mixers, A/D converters, frequency measurement
The compositions such as module, wherein, four power splitters are divided into four tunnels by pulse signal work(is emitted；Two power splitters are by the transmitting pulse after four work(point
Work(is divided into two-way to signal again, leads directly to connect with I/Q frequency mixers all the way, delayed line is connect with I/Q frequency mixers all the way, is converted to I/
Q two paths of signals, and enter double channel A/D converters；Four tunnel double channel As/D converters respectively to i/q signal carry out high-speed sampling,
Frequency measuring block is sent after quantization；Frequency measuring block completes the frequency measurement of transmitting pulse signal, output frequency code.It is working
In the process, by power splitter (above-mentioned two power splitter and four centimeters of devices) will be pretreated after transmitting pulse signal be divided into eight tunnels and penetrate
Frequency signal, wherein, one end of four tunnels difference I/Q frequency mixers (autocorrelator), another four tunnel is sent to auto-correlation respectively by delay line
The other end of device after four I/Q frequency mixers are handled, exports eight road IQ vision signals.Later, double channel A/D converters are to defeated
The IQ vision signals entered carry out phase demodulation, temperature correction, 1 after carrying out AD samplings to four channels:4:16:It is produced after 64 schools code and splicing
Raw 14 bit frequency codes and correlated condition code are exported.
By the control code generation module that a FPGA circuitry obtains according to instantaneous frequency measurement module (broadband instantaneous frequency measurement receiver)
The frequency code of output is tabled look-up by ROM memory and generates control code.
Local oscillation signal is generated according to the control code of generation by a frequency synthesizing module (direct frequency synthesis synthesizer), specifically
The frequency synthesizing module is mainly made of DDS, second filter, frequency multiplier, amplifier etc., and frequency switching time is fast, volume
It is small, mutually make an uproar.Specifically, DDS input reference clock signals are 1.2GHz, and the upper limit of output frequency is 600MHz, in engineer application
Middle selection 50MHz~450MHz puts the frequency time less than 500ns.DDS receives the control code of the output of control code generation module 130
Later, output signal of the frequency between 50MHz~450MHz is generated；Second filter is filtered DDS output signals, filter
Noise wave removing signal；DDS output signals are carried out process of frequency multiplication by frequency multiplier, extend reference frequency output, generate local oscillator needed for radar
Signal；Amplifier carries out power amplification to signal so that local oscillation signal power meets radar receiver requirement.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, in the premise for not departing from the principle of the invention
Under, several improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of wideband adaptive frequency-tracking system, which is characterized in that the frequency-tracking system includes：
The instantaneous frequency measurement module of frequency code is obtained for carrying out frequency measurement to the transmitting pulse signal received；
For the memory module of storing frequencies code and the incidence relation table of control code；
For the frequency code measured according to instantaneous frequency measurement module, the control code generation of control code is tabled look-up and generated from memory module
Module, the control code generation module are connect respectively with instantaneous frequency measurement module and memory module；
For the frequency synthesizing module of control code generation local oscillation signal generated according to control code generation module, the frequency synthesis
Module is connect with the control code generation module.
2. frequency-tracking system as described in claim 1, which is characterized in that further include to connect in the frequency-tracking system
Transmitting-receiving penetrates pulse signal and carries out pretreatment operation, and pretreated transmitting pulse signal is sent to the instantaneous frequency measurement module
Preprocessing module, the preprocessing module connect with the instantaneous frequency measurement module.
3. frequency-tracking system as described in claim 1, which is characterized in that the control code generation module is according to instantaneous frequency measurement
The frequency code that module measures tables look-up from memory module and generates parallel control code；The frequency synthesizing module is according to control code
The parallel control code generation local oscillation signal of generation module generation.
4. the frequency-tracking system as described in claims 1 or 2 or 3, which is characterized in that the control code generation module is FPGA
Circuit, the frequency code that the FPGA circuitry is measured according to instantaneous frequency measurement module table look-up from memory module and generate control code.
5. the frequency-tracking system as described in claims 1 or 2 or 3, which is characterized in that the frequency synthesizing module includes：
DDS, the control code for being generated according to control code generation module generate the output signal in the range of predeterminated frequency；
Frequency multiplier is connect with the DDS, and the output signal for being generated to DDS carries out frequency multiplication and operates to obtain local oscillation signal.
6. a kind of wideband adaptive frequency tracking method, which is characterized in that the frequency tracking method includes：
Receive transmitting pulse signal；
Frequency measurement is carried out to the transmitting pulse signal received, obtains frequency code；
Control code is generated according to the frequency code measured, the frequency code is associated with control code；
Local oscillation signal is generated according to the control code of generation.
7. frequency tracking method as claimed in claim 6, which is characterized in that further included after transmitting pulse signal is received：
Pretreatment operation is carried out to receiving transmitting pulse signal.
8. frequency tracking method as claimed in claim 6, which is characterized in that
In control code is generated according to the frequency code measured, specially：Parallel control code is generated according to the frequency code measured；
In local oscillation signal is generated according to the control code of generation, specially：Local oscillation signal is generated according to the parallel control code of generation.
9. the frequency tracking method as described in claim 6 or 7 or 8, which is characterized in that table look-up simultaneously according to the frequency code measured
It generates in control code, specially：FPGA circuitry is tabled look-up the control code that is associated according to the frequency code measured in storage inside.
10. the frequency tracking method as described in claim 6 or 7 or 8, which is characterized in that generated according to the control code of generation
In local oscillation signal, including：
Output signal in the range of predeterminated frequency is generated according to control code；
Frequency multiplication is carried out to output signal to operate to obtain local oscillation signal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108777599A (en) * | 2018-08-15 | 2018-11-09 | 上海频语电子技术有限公司 | A kind of microwave broadband instantaneous frequency measurement reception system |
| CN111562572A (en) * | 2020-05-07 | 2020-08-21 | 中国人民解放军63791部队 | Method for capturing pulse radar blind area |
| CN114325189A (en) * | 2021-12-29 | 2022-04-12 | 上海联影医疗科技股份有限公司 | Working state detection method, system, device and equipment of magnetron |
| CN114839612A (en) * | 2022-07-04 | 2022-08-02 | 中国海洋大学 | X-waveband instantaneous frequency measurement receiver and receiving method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3996588A (en) * | 1974-06-25 | 1976-12-07 | Thomson-Csf | System for automatic frequency control |
| US5701598A (en) * | 1990-09-14 | 1997-12-23 | Atkinson; Noel D. | Scanning receiver with direct digital frequency synthesis and digital signal processing |
| CN101276002A (en) * | 2007-03-26 | 2008-10-01 | 中国海洋石油总公司 | High temperature monolithic phase programmable direct numerical frequency synthetic source |
| CN203761370U (en) * | 2014-02-13 | 2014-08-06 | 西安华腾微波有限责任公司 | Narrow pulse signal automatic frequency control device |
| RU1840973C (en) * | 1976-01-04 | 2014-11-20 | Государственное Предприятие "Научно-Исследовательский Институт "Квант" | Device for automatic measurement of frequency of readjusted frequency-controlled oscillator |
| WO2017008282A1 (en) * | 2015-07-15 | 2017-01-19 | 华为技术有限公司 | Cs local sequence generation method and device, transmitter and receiver |
| CN207780234U (en) * | 2018-01-04 | 2018-08-28 | 上海微抗电子技术有限公司 | Wideband adaptive frequency-tracking system |
-
2018
- 2018-01-04 CN CN201810009339.6A patent/CN108169742A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3996588A (en) * | 1974-06-25 | 1976-12-07 | Thomson-Csf | System for automatic frequency control |
| RU1840973C (en) * | 1976-01-04 | 2014-11-20 | Государственное Предприятие "Научно-Исследовательский Институт "Квант" | Device for automatic measurement of frequency of readjusted frequency-controlled oscillator |
| US5701598A (en) * | 1990-09-14 | 1997-12-23 | Atkinson; Noel D. | Scanning receiver with direct digital frequency synthesis and digital signal processing |
| CN101276002A (en) * | 2007-03-26 | 2008-10-01 | 中国海洋石油总公司 | High temperature monolithic phase programmable direct numerical frequency synthetic source |
| CN203761370U (en) * | 2014-02-13 | 2014-08-06 | 西安华腾微波有限责任公司 | Narrow pulse signal automatic frequency control device |
| WO2017008282A1 (en) * | 2015-07-15 | 2017-01-19 | 华为技术有限公司 | Cs local sequence generation method and device, transmitter and receiver |
| CN207780234U (en) * | 2018-01-04 | 2018-08-28 | 上海微抗电子技术有限公司 | Wideband adaptive frequency-tracking system |
Non-Patent Citations (1)
| Title |
|---|
| 易小中等: ""一种毫米波非相参频率捷变跟踪本振的设计"", 《微波学报》, no. 2, pages 355 - 357 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108777599A (en) * | 2018-08-15 | 2018-11-09 | 上海频语电子技术有限公司 | A kind of microwave broadband instantaneous frequency measurement reception system |
| CN111562572A (en) * | 2020-05-07 | 2020-08-21 | 中国人民解放军63791部队 | Method for capturing pulse radar blind area |
| CN114325189A (en) * | 2021-12-29 | 2022-04-12 | 上海联影医疗科技股份有限公司 | Working state detection method, system, device and equipment of magnetron |
| CN114325189B (en) * | 2021-12-29 | 2024-04-05 | 上海联影医疗科技股份有限公司 | Method, system, device and equipment for detecting working state of magnetron |
| CN114839612A (en) * | 2022-07-04 | 2022-08-02 | 中国海洋大学 | X-waveband instantaneous frequency measurement receiver and receiving method thereof |
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