CN108011653A - Based on adaptive fast Acquisition tracking system and method - Google Patents
Based on adaptive fast Acquisition tracking system and method Download PDFInfo
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- CN108011653A CN108011653A CN201711344263.4A CN201711344263A CN108011653A CN 108011653 A CN108011653 A CN 108011653A CN 201711344263 A CN201711344263 A CN 201711344263A CN 108011653 A CN108011653 A CN 108011653A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7087—Carrier synchronisation aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
- H04L7/002—Arrangements for synchronising receiver with transmitter correction of synchronization errors correction by interpolation
- H04L7/0025—Arrangements for synchronising receiver with transmitter correction of synchronization errors correction by interpolation interpolation of clock signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/027—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
- H04L7/0274—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit with Costas loop
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- Position Fixing By Use Of Radio Waves (AREA)
- Noise Elimination (AREA)
Abstract
Included the invention discloses a kind of based on adaptive fast Acquisition tracking system and method, system：High dynamic direct expansion source module, including high dynamic direct expansion baseband signal generation module and up-converter module, wherein, the high dynamic direct expansion baseband signal that the high dynamic direct expansion baseband signal generation module produces is converted to radio frequency band through up-converter module and sends；Base band fast Acquisition tracking module, including down conversion module, AD sampling modules, accumulation calculating module, energy comparison module, timing feedback module, signal compensation module, initial frequencies and pseudo-code phase module, pseudo-code tracing module, despreading module, carrier tracking module, demodulation module, bit sync module, recovery data module, statistics bit error rate module.The present invention carries out estimation frequency, pseudo-code phase to signal, is rapidly completed acquisition and tracking, takes the advantages of Space Vehicle System resource is few, and verifies simplicity, being capable of fast Acquisition tracking.
Description
Technical field
The present invention relates to a kind of based on adaptive fast Acquisition tracking system and method, belong to spacecraft receiving device
Technical field.
Background technology
Equipment is different between ground face mould survey station and tracking telemetry and command station, there are the switching of different signal-to-noise ratio, with the transmitting of spacecraft, letter
Make an uproar than also changing correspondingly, in addition, acceleration and acceleration that relative motion produces, can cause reception signal to contain mostly general
Strangle frequency displacement and one, second dervative.In the case of adaptive signal-to-noise ratio and high dynamic, carrying out fast Acquisition and tracking to signal is
Spacecraft receiver needs the key technology solved, has critical role in national information security strategy.
The system performance verification of spacecraft receiver can be divided into simplation verification and flight validation at present.Simplation verification, that is, exist
Under laboratory environment, baseband signal simulation is carried out to transmitting signal with high dynamic direct expansion source module, so as to tight in tracking telemetry and command station resource
The today opened, high dynamic direct expansion source module takes up less resources, in addition, high dynamic direct expansion source module basic parameter can configure, wirelessly
The characteristic of channel (a variety of conflicting modes such as single-tone, arrowband, broadband, multitone, frequency sweep, frequency hopping) can also very easily select one
Kind or a variety of additions, simplation verification undoubtedly have very big advantage, are conducive to improve the reliability of simplation verification.Simulation is tested
Most important link in card, exactly requires every system index of receiver all to exceed the requirement of flight validation, and reserves surplus.
Spacecraft receiver system performance verification can be achieved using above-mentioned technology.But in different noises when high dynamic
(such as external GPS and dipper system, the TT＆C satellite in China) under environment, not only to ensure capture time, also to ensure to catch
Succeed rate.This is harsh challenge to the design of spacecraft receiver.
The content of the invention
Problems to be solved by the invention are that existing acquisition and tracking system occupancy equipment complexity is big, and verify difficulty, can not
Quick the problem of realizing acquisition and tracking,
Technological means for solving problem is, proposes that a kind of adaptive high low signal-to-noise ratio, high dynamic direct sequence signal are
System and method, track so as to fulfill fast Acquisition.It is of the invention that above-mentioned technical problem is specifically solved using following technical scheme：
It is a kind of based on adaptive fast Acquisition tracking system, including：
High dynamic direct expansion source module, including high dynamic direct expansion baseband signal generation module and up-converter module, wherein, it is described
The high dynamic direct expansion baseband signal that high dynamic direct expansion baseband signal generation module produces is converted to radio frequency band through up-converter module
And send；
Base band fast Acquisition tracking module, including down conversion module, AD sampling modules, accumulation calculating module, energy comparison
Module, timing feedback module, signal compensation module, initial frequencies and pseudo-code phase module, pseudo-code tracing module, despreading mould
Block, carrier tracking module, demodulation module, bit sync module, recovery data module, statistics bit error rate module, wherein, the lower change
Frequency module changes to baseband signal after wireless channel receives, by radio frequency band signal, by adding up after being sampled by AD sampling modules
Computing module is divided into multistage by data rate according to the Doppler frequency of carrier wave, and carries out relevant and noncoherent accumulation；The energy
This maximum compared is selected in accumulation result judgement of the amount comparison module to accumulation calculating module, and by timing feedback module root
Commutator pulse is produced according to the judging result of energy comparison module, and cumulative frequency is controlled according to commutator pulse using signal compensation module
Rate, the whole Doppler frequency range of searching carrier obtain verification value；The initial frequencies and pseudo-code phase module will timings
The verification value of feedback module is converted to frequency, pseudo-code phase, and inputs pseudo-code tracing module and carrier tracking module respectively；It is described
Pseudo-code tracing module is after initialization pseudo-code phase or so adjacent chip is reaffirmed and carries out pseudo-code tracing, and by despreading module
Base band data and pseudo-code are peeled off；The carrier tracking module, after frequency discrimination result is aided in acceleration, velocity component, warp
Cross phaselocked loop and renewal is timed to carrier phase, and real-time residual GM is compensated to pseudo-code tracing module；The demodulation
Phase after module carrier track according to obtained by carrier tracking module carries out coherent demodulation, and timing interpolation is produced through bit sync module
After adjustment bit timing clock, using synchronization character sequence in bit timing detection data and data are pressed into frame lattice by recovery data module
Formula is alignd, and is obtained and is recovered data by bit；The statistics bit error rate module is by high dynamic direct expansion source data source and is recovered
Data are contrasted by bit, count error rate of system.
Further, as a preferred technical solution of the present invention：The high dynamic direct expansion baseband signal generation module
Produce the high dynamic direct expansion baseband signal of configurable speed, acceleration and acceleration.
Further, as a preferred technical solution of the present invention：The accumulation calculating module combination data rate with
Frequency shift (FS) is segmented according to the Doppler frequency of carrier wave, is taken absolute value addition by FIR filter, to reach required capture
Signal-to-noise ratio.
Further, as a preferred technical solution of the present invention：The AD sampling modules use AD9148 type digital-to-analogues
Converter.
Further, as a preferred technical solution of the present invention：The accumulation calculating module uses V5SX95T types
Fpga chip.
The present invention is based on adaptive fast Acquisition tracking system, it is also proposed that its method, including step：
The high dynamic direct expansion baseband signal of generation is converted to radio frequency band and is sent；
The radio frequency band signal of reception is changed into baseband signal, by pressing data rate after sampling by the dynamic range of carrier wave
It is divided into multistage, and carries out relevant and noncoherent accumulation；And accumulation result is judged to select this maximum compared, and according to sentencing
Disconnected result produces commutator pulse；And cumulative frequency is controlled according to commutator pulse, the whole dynamic range of searching carrier is confirmed
Value, and will confirm that value is converted to frequency, pseudo-code phase, and pseudo-code tracing and carrier track are carried out respectively；
The pseudo-code tracing, be included in after the adjacent chip of initialization pseudo-code phase or so is reaffirmed and carry out pseudo-code with
Track, and it is sent into carrier track after base band data and pseudo-code are peeled off；The carrier track, including frequency discrimination result is aided in accelerating
Degree, after velocity component, carrier phase is timed renewal by phaselocked loop, and by real-time residual GM compensate to pseudo-code with
Track process；Also, coherent demodulation is carried out according to the phase after gained carrier track, when through generation timing interpolation and adjusting bit timing
Zhong Hou, detects synchronization character sequence in data using bit timing and data is alignd by frame format, obtain and recover data by bit；And
High dynamic direct expansion source data source is contrasted with obtaining recovery data by bit, counts error rate of system.
Further, as a preferred technical solution of the present invention：Configurable speed, acceleration are produced in the method
And the high dynamic direct expansion baseband signal of acceleration.
Further, as a preferred technical solution of the present invention：Data rate is combined in the method and frequency is inclined
Pseudo- code frequency is segmented by shifting, is taken absolute value additions by FIR filter, to capture signal-to-noise ratio needed for reaching.
Further, as a preferred technical solution of the present invention：When the whole dynamic of searching carrier in the method
When scope obtains verification value, reaffirming, which only need to close on initial pseudo-code phase, carries out searching again for maximum.
Invention effect
The present invention uses above-mentioned technical proposal, can produce following technique effect：
It is provided by the invention based on adaptive fast Acquisition tracking system and method, be a kind of to take equipment complexity
It is few, and verify easy fast Acquisition tracking system, and signal is carried out it is adaptive differentiate signal-to-noise ratio, confirm initial frequencies and
Pseudo-code phase, compensates direct sequence signal, is tracked so as to fulfill fast Acquisition.And the present invention has compared with prior art
Have the following advantages：
(1) present invention estimates signal desired by system in the case of without using inertial guidance data
Frequency, pseudo-code phase, are rapidly completed acquisition and tracking, take the advantages of Space Vehicle System resource is few；
(2) present invention has very big flexibility, by base band in high dynamic direct expansion source module to the simplation verification stage
On dynamic and the characteristic of channel superposition, save testing meter and instrument, there is simulated flight authentication function, it is possible to provide baseband interface
It is direct-connected, there is provided radio frequency interface only needs a upconverter.
(3) present invention depends on data rate and dynamic performance requirements, and accumulation calculating module and signal compensation module can divide
Cut, can realize different receiver performances according to system requirements and hardware resource situation.
(4) energy comparison module and timing feedback module of the invention, realize under different signal-to-noise ratio environment, to accurate
Frequency and pseudo-code phase are estimated；Frequency and pseudo-code phase precision, can be adjusted according to system requirements and hardware resource situation
It is whole.
Brief description of the drawings
Fig. 1 is the system schematic of the present invention.
Fig. 2 is the operation principle schematic diagram of the high dynamic direct expansion source module of the present invention.
Fig. 3 is the operation principle schematic diagram of the base band fast Acquisition tracking module of the present invention.
Embodiment
Hereinafter, it is described in detail based on attached drawing for the present invention.
Embodiments of the present invention are described with reference to Figure of description.
As shown in Figure 1, the present invention is proposed and a kind of mainly wrapped based on adaptive fast Acquisition tracking system, the system
Include：High dynamic direct expansion source module and base band fast Acquisition tracking module.
Wherein, high dynamic direct expansion source module, including high dynamic direct expansion baseband signal generation module and up-converter module, its
In, the high dynamic direct expansion baseband signal of the high dynamic direct expansion baseband signal generation module generation is converted to through up-converter module penetrates
Frequent section is simultaneously sent；
Wherein, base band fast Acquisition tracking module, including down conversion module, AD sampling modules, accumulation calculating module, energy
Comparison module, timing feedback module, signal compensation module, initial frequencies and pseudo-code phase module, pseudo-code tracing module, despreading
Module, carrier tracking module, demodulation module, bit sync module, recovery data module, statistics bit error rate module, wherein, under described
Frequency-variable module changes to baseband signal after wireless channel receives, by radio frequency band signal, by tiring out after being sampled by AD sampling modules
Add computing module to be divided into multistage according to the dynamic range of carrier wave by data rate, and carry out relevant and noncoherent accumulation；The energy
This maximum compared is selected in accumulation result judgement of the amount comparison module to accumulation calculating module, and by timing feedback module root
Commutator pulse is produced according to the judging result of energy comparison module, and cumulative frequency is controlled according to commutator pulse using signal compensation module
Rate, the whole dynamic range of searching carrier obtain verification value；The initial frequencies and pseudo-code phase module are by timing feedback mould
The verification value of block is converted to frequency, pseudo-code phase, and inputs pseudo-code tracing module and carrier tracking module respectively；The pseudo-code with
Track module is after the adjacent chip of initialization pseudo-code phase or so is reaffirmed and carries out pseudo-code tracing, and by despreading module by base band
Data are peeled off with pseudo-code；The carrier tracking module, after frequency discrimination result is aided in acceleration, velocity component, by locking phase
Ring is timed carrier phase renewal, and real-time residual GM is compensated to pseudo-code tracing module；The demodulation module root
Coherent demodulation is carried out according to the phase after carrier track obtained by carrier tracking module, timing interpolation and adjustment are produced through bit sync module
After bit timing clock, using synchronization character sequence in bit timing detection data and data are pressed into frame format pair by recovery data module
Together, obtain and recover data by bit；The statistics bit error rate module will be obtained from high dynamic direct expansion baseband signal generation module
High dynamic direct expansion source data source is contrasted with obtaining recovery data by bit, counts error rate of system, wherein high dynamic
Whether direct expansion source data source is the content in configurable data source, including length, content, be interrupted, contain count value.
Preferably, the high dynamic direct expansion baseband signal generation module produces configurable speed, acceleration and acceleration
High dynamic direct expansion baseband signal.Data rate, carrier wave updating speed, pseudo- bit rate are influenced by Doppler.Specifically,
What relative moving speed influenced is Doppler frequency i.e. frequency offseting value, and what relative acceleration influenced is doppler changing rate i.e. frequency
Rate single order change rate, with respect to acceleration influence be doppler changing rate change rate, i.e. frequency second order change rate；Channel is special
Property can reach required signal-to-noise ratio, jamming-to-signal ratio by the proportionality coefficient in control interference signal, noise signal, high dynamic source Lai real
It is existing.
Pseudo- code frequency is segmented by the accumulation calculating module combination data rate with frequency shift (FS), is filtered by FIR
Device takes absolute value addition, with capture signal-to-noise ratio needed for reaching.Timing feedback module, completes the condition that redirects of single frequency, energy
Comparison module is completed to be contrasted after whole circulation, the pseudo-code phase and frequency offseting value that determining maximum occurs, and in puppet
Code phase adjacent locations search again for, and compare the selection that can once complete optimal pseudo-code phase, can be fast with reference to frequency offseting value
Speed completes pseudo-code tracing and carrier track.
In the present embodiment, the high dynamic direct expansion source module unit in the present invention preferably uses the AD9148 type digital-to-analogues of AD companies
Converter, its baseband signal to generation are sampled to 140M, and radio frequency band is faded to by upconverter；The number of baseband signal
According to speed, pseudo- bit rate by the dynamic change after the conversion after frequency-dividing clock addition up-conversion, carriers rate by adjusting phase
Storage cosine ROM module in the corresponding FPGA in position produces dynamic change effect, its ratio presses the frequency progress mould after up-conversion
Intend.
To base band after the downconverted device of base band fast Acquisition tracking module, using the AD9239 type digital analog converters of AD companies
The signal for being converted to 140M is sampled, it supports 4 tunnel sampled signal inputs, and the V5SX95T type fpga chips of use, add up
Computing module is realized in FPGA, carries out base band fast Acquisition tracking afterwards, and sampling obtained by AD9239 types digital analog converter is believed
Number carrier Doppler frequency is divided into multistage by data rate, with and carry out relevant and noncoherent accumulation；Energy comparison module is right
Accumulation result judges, selects this maximum compared；Timing feedback module, according to comparing result, produces commutator pulse；Signal
Compensating module, cumulative frequency, the whole dynamic range of searching carrier are controlled according to commutator pulse；Initial frequencies, pseudo-code phase
Module, frequency, pseudo-code phase are converted to by the verification value of timing feedback, and input pseudo-code tracing module and carrier tracking module；
Pseudo-code tracing module, after the adjacent chip of initialization pseudo-code phase or so is reaffirmed and carries out pseudo-code tracing；Module is de-spread, will
Base band data is peeled off with pseudo-code；Carrier tracking module, after frequency discrimination result is aided in acceleration, velocity component, by phaselocked loop pair
Carrier phase is timed renewal, and real-time residual GM is compensated to pseudo-code tracing loop；Demodulation module, using carrier wave with
Phase information after track, carries out coherent demodulation；Bit sync module, produces timing interpolation, adjusts bit timing clock；Recover data mould
Block, synchronization character sequence in data is detected using bit timing, and data are alignd by frame format；Bit error rate module is counted, height is dynamic
State direct expansion source data source is contrasted with recovering data by bit, counts error rate of system.
Fig. 2 shows a kind of structure of embodiment of high dynamic direct expansion source module in the present invention.Data rate data_clk,
Carrier wave updating speed dds, pseudo- bit rate pn_clk by speed (frequency offseting value), acceleration (frequency single order change rate) plus
The control (frequency second order change rate) of acceleration, the clock of above-mentioned frequency dividing use 110M, and control counter uses 64 bit wides, can be with
Ensure to produce the high dynamic data source that Phase Continuation changes, wherein, data rate and pseudo- bit rate can be set, and carrier center is
25M.Meanwhile signal-to-noise ratio control signal (control noise power) and jamming-to-signal ratio control signal (control jamming power) and high dynamic number
It is overlapped according to source on 25M, inputs to AD9148 type digital analog converters, AD9148 digital analog converters and internal lock is configured by SPI
Phase ring times after sampled, export 140M intermediate-freuqncy signals, exports to up-conversion to 165M.
Fig. 3 shows a kind of structure of embodiment of base band fast Acquisition tracking module in the present invention.DDS produces 30M's
Cos θ and sin θ, are multiplied with AD digital analog converter sampled signals respectively, by low-pass filter, eliminate high fdrequency component.And with 1
Signal after low-pass filtering is divided into K sections, K sections are capture signal-to-noise ratio by the corresponding pseudo-code number of a data rate Ts as points N
The cumulative number of minimum.Preserved with the pseudo-code result of same length to ROM, after the pseudo-code and low-pass filtering that every time preserve ROM
Signal multiplication, complete accumulation operations by FIR filter, K section of FIR output result taken absolute value preservation, change pseudo-code
Speed Δ f is simultaneously calculated next time.
FIR output result correspondence positions are added by energy comparison module, are then compared and are drawn energy maximum point.Timing feedback
Module is by the frequency search one time in dynamic range, with reference to energy comparison module, confirms position and the frequency of pseudo-code phase maximum
Rate deviates.Meanwhile initial frequencies carrier phase, pseudo-code phase pn phase, carry out pseudo-code tracing as initial value
And carrier track, it is contemplated that have delay between energy comparison module and actual signal, carried out in pseudo-code phase pn phase or so
Search, reaffirms the position that chip occurs；The deviation effects of frequency are smaller, it is not necessary to reaffirm.
De-spread module and corresponding pseudo-code is produced according to the position of chip and frequency difference, de-spread, meanwhile, by carrier wave residual error
Δ θ feeds back to PN code tracking loop aid in treatment, improves the precision of pseudo-code tracing.Demodulation module is carried out using traditional Costas rings
Demodulation, bit-synchronization algorithm are controlled according to Gardner algorithms into row interpolation, produce the optimum sampling position of data, same by searching for
Step sequence, is contrasted with data source, draws error rate of system.
The key point of the present invention is energy comparison module and timing feedback module, splits by frequency and searches for maximum,
High low signal-to-noise ratio can not be differentiated between, avoids some algorithm under high s/n ratio due to the Frequency Estimation brought beyond detection threshold
The problem of inaccurate, carry out searching again for maximum in addition, reaffirming and only need to close on initial pseudo-code phase.
Secondly, the division of K values need to only meet the capture sensitivity minimization of signal, meanwhile, realize that code only needs module all the way,
Other module reusables, it is clear in structure；
Again, the phase of direct expansion dynamic source signal is produced and can met：2^64/110M (frequency accuracy Hz), 2^64/110M/
110M (frequency single order change rate precision Hz/s)；
Finally, interference and the simulation of noise produce building easy to test system, being capable of fast verification system performance.
On the basis of said system, the present invention also propose it is a kind of based on adaptive fast Acquisition tracking, including
Step：
The high dynamic direct expansion baseband signal of generation is converted to radio frequency band and is sent；
The radio frequency band signal of reception is changed into baseband signal, by pressing data rate after sampling by the dynamic range of carrier wave
It is divided into multistage, and carries out relevant and noncoherent accumulation；And accumulation result is judged to select this maximum compared, and according to sentencing
Disconnected result produces commutator pulse；And cumulative frequency is controlled according to commutator pulse, the whole dynamic range of searching carrier is confirmed
Value, and will confirm that value is converted to frequency, pseudo-code phase, and pseudo-code tracing and carrier track are carried out respectively；
The pseudo-code tracing, be included in after the adjacent chip of initialization pseudo-code phase or so is reaffirmed and carry out pseudo-code with
Track, and it is sent into carrier track after base band data and pseudo-code are peeled off；The carrier track, including frequency discrimination result is aided in accelerating
Degree, after velocity component, carrier phase is timed renewal by phaselocked loop, and by real-time residual GM compensate to pseudo-code with
Track process；Also, coherent demodulation is carried out according to the phase after gained carrier track, when through generation timing interpolation and adjusting bit timing
Zhong Hou, detects synchronization character sequence in data using bit timing and data is alignd by frame format, obtain and recover data by bit；And
High dynamic direct expansion source data source is contrasted with obtaining recovery data by bit, counts error rate of system.
Wherein, the high dynamic direct expansion baseband signal of configurable speed, acceleration and acceleration is produced in the method.It is excellent
Pseudo- code frequency is segmented with frequency shift (FS) with reference to data rate in selection of land the method, is taken absolute value by FIR filter
It is added, to reach required capture signal-to-noise ratio.
And in the method when the whole dynamic range of searching carrier obtains verification value, reaffirming only need to be to first
Beginning pseudo-code closes on phase and carries out searching again for maximum.
To sum up, system and method for the invention, in the case of without using inertial guidance data, carry out signal desired by system
Estimate frequency, pseudo-code phase, be rapidly completed acquisition and tracking, take the advantages of Space Vehicle System resource is few.
And verification is easy, can fast Acquisition tracking, be possess adaptive high low signal-to-noise ratio, high dynamic direct sequence signal it is fast
Fast acquisition and tracking algorithm and system, realize under different signal-to-noise ratio environment, accurate frequency and pseudo-code phase are estimated；Frequently
Rate and pseudo-code phase precision, can be adjusted according to system requirements and hardware resource situation.
It should be noted that described above is only the preferred embodiment of the present invention, it will be appreciated that for art technology
For personnel, some changes and improvements can also be made on the premise of the technology of the present invention design is not departed from, these are included in
In protection scope of the present invention.
Claims (9)
- It is 1. a kind of based on adaptive fast Acquisition tracking system, it is characterised in that including：High dynamic direct expansion source module, including high dynamic direct expansion baseband signal generation module and up-converter module, wherein, it is described high dynamic It is concurrent that the high dynamic direct expansion baseband signal that state direct expansion baseband signal generation module produces through up-converter module is converted to radio frequency band Send；Base band fast Acquisition tracking module, including down conversion module, AD sampling modules, accumulation calculating module, energy comparison module, Timing feedback module, signal compensation module, initial frequencies and pseudo-code phase module, pseudo-code tracing module, despreading module, carrier wave Tracking module, demodulation module, bit sync module, recovery data module, statistics bit error rate module, wherein, the down conversion module After wireless channel receives, radio frequency band signal is changed into baseband signal, by accumulation calculating mould after being sampled by AD sampling modules Block is divided into multistage by data rate according to the Doppler frequency of carrier wave, and carries out relevant and noncoherent accumulation；The energy comparison This maximum compared is selected in accumulation result judgement of the module to accumulation calculating module, and by timing feedback module according to energy The judging result of comparison module produces commutator pulse, and controls cumulative frequency according to commutator pulse using signal compensation module, searches The whole dynamic range of Suo Zaibo obtains verification value；The initial frequencies and pseudo-code phase module by timing feedback module really Recognize value and be converted to frequency, pseudo-code phase, and input pseudo-code tracing module and carrier tracking module respectively；The pseudo-code tracing module After the adjacent chip of initialization pseudo-code phase or so is reaffirmed and carry out pseudo-code tracing, and by despreading module by base band data with Pseudo-code is peeled off；The carrier tracking module, after frequency discrimination result is aided in acceleration, velocity component, by phaselocked loop to carrying Wave phase is timed renewal, and real-time residual GM is compensated to pseudo-code tracing module；The demodulation module is according to carrier wave Phase after carrier track obtained by tracking module carries out coherent demodulation, and timing interpolation and adjustment bit timing are produced through bit sync module After clock, using synchronization character sequence in bit timing detection data and data are alignd by frame format, obtained by recovery data module Recover data by bit；It is described statistics bit error rate module by high dynamic direct expansion source data source and obtain recovery data by bit into Row contrast, counts error rate of system.
- It is 2. according to claim 1 based on adaptive fast Acquisition tracking system, it is characterised in that：The high dynamic is straight Expand the high dynamic direct expansion baseband signal that baseband signal generation module produces configurable speed, acceleration and acceleration.
- It is 3. according to claim 1 based on adaptive fast Acquisition tracking system, it is characterised in that：The accumulation calculating Module combination data rate is segmented with frequency shift (FS) according to the Doppler frequency of carrier wave, is taken absolute value by FIR filter It is added, to reach required capture signal-to-noise ratio.
- It is 4. according to claim 1 based on adaptive fast Acquisition tracking system, it is characterised in that：The AD samples mould Block uses AD9148 type digital analog converters.
- It is 5. according to claim 1 based on adaptive fast Acquisition tracking system, it is characterised in that：The accumulation calculating Module uses V5SX95T type fpga chips.
- 6. according to the method according to any one of claims 1 to 5 based on adaptive fast Acquisition tracking system, its feature It is, including step：The high dynamic direct expansion baseband signal of generation is converted to radio frequency band and is sent；The radio frequency band signal of reception is changed into baseband signal, by pressing Doppler frequency of the data rate according to carrier wave after sampling It is divided into multistage, and carries out relevant and noncoherent accumulation；And accumulation result is judged to select this maximum compared, and according to sentencing Disconnected result produces commutator pulse；And cumulative frequency is controlled according to commutator pulse, the whole dynamic range of searching carrier is confirmed Value, and will confirm that value is converted to frequency, pseudo-code phase, and pseudo-code tracing and carrier track are carried out respectively；The pseudo-code tracing, is included in after initialization pseudo-code phase or so adjacent chip is reaffirmed and carries out pseudo-code tracing, and Carrier track is sent into after base band data and pseudo-code are peeled off；The carrier track, including frequency discrimination result is aided in into acceleration, speed After component, renewal is timed to carrier phase by phaselocked loop, and real-time residual GM is compensated to pseudo-code tracing process； Also, coherent demodulation is carried out according to the phase after gained carrier track, after producing timing interpolation and adjustment bit timing clock, profit Synchronization character sequence in data is detected with bit timing and data are alignd by frame format, is obtained and is recovered data by bit；It is and height is dynamic State direct expansion source data source is contrasted with obtaining recovery data by bit, counts error rate of system.
- 7. the method according to claim 6 based on adaptive fast Acquisition tracking system, it is characterised in that the side The high dynamic direct expansion baseband signal of configurable speed, acceleration and acceleration is produced in method.
- 8. the method according to claim 6 based on adaptive fast Acquisition tracking system, it is characterised in that the side Carrier Doppler frequency is segmented with frequency shift (FS) with reference to data rate in method, is taken absolute value addition by FIR filter, To reach required capture signal-to-noise ratio.
- 9. the method according to claim 6 based on adaptive fast Acquisition tracking system, it is characterised in that the side In method when the whole Doppler frequency range of searching carrier obtains verification value, reaffirm only need to close on phase to initial pseudo-code Carry out searching again for maximum.
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