CN105306094B - A kind of Spread Spectrum Digital receiver signal flash quick capturing method - Google Patents
A kind of Spread Spectrum Digital receiver signal flash quick capturing method Download PDFInfo
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Abstract
A kind of Spread Spectrum Digital receiver signal flash quick capturing method, step is: S1: testing mechanism in real time；S2: loop runs toward the direction of offset signal if detecting, makes deviation enumerator from adding, enters step S3；Otherwise, if signal flash flag set, step S5 is entered；S3: if deviation Counter Value exceedes pre-determined threshold A, loop losing lock, receiver, by losing lock, terminates；Otherwise, if deviation Counter Value exceedes pre-determined threshold B, wherein B < A, then it is judged as signal interruption, enters step S4；Otherwise, step S1 is returned to；S4: set signal flash mark, continues to run with tracking；S5: loop work situation trends towards approach signal, it is judged that signal flash process terminates, and has been again introduced into receiver；Clear signal flash mark, resets deviation enumerator；S6: be loaded into loop without departing from time backup loop output, restart tracking process；S7: be directly entered tracking phase.The present invention has easily realization, good reliability, the advantage such as applied widely.
Description
Technical field
Present invention relates generally to the design field of Spread Spectrum Digital receiver, refer in particular to a kind of Spread Spectrum Digital receiver signal flash quick
Catching method.
Background technology
Currently, in Satellite TT system, spread spectrum is widely used.The band spread receiver used in space, is possible not only to realize
Possesses the communication system of higher sensitivity and interference free performance, it is also possible to complete the functions such as high-precision measurement orbit determination.Due to electricity
The factors such as absciss layer shake and attitude of flight vehicle upset can cause the unexpected short interruption (flash) of receiver signal.Spread spectrum receiver
Machine, after locking, runs into the situation of this signal flash, may cause receiver losing lock, and in signal the biggest dynamic feelings itself
Under condition, losing lock is easier to occur.
During signal flash, the break period of its normal signal is likely to be breached several milliseconds or a few tens of milliseconds, now receiver tracking loop circuit
The value of correlator output result necessarily mistake, can mislead loop based on the mistake frequency discrimination of correlated results, phase demodulation error, cause ring
Road is deviateed.Break period is the longest, deviates the biggest, if additionally signal Doppler is relatively big, the deviation of track loop and signal is the most more
Greatly, signal recover normal after, receiver is difficult to continue to keep the tracking to signal thus losing lock, even due to carrier frequency or
Code phase, bit rate have deviated from right value and make receiver enter vacation lock duty.
Receiver adds the connection setup time under thermal starting state because of recapturing unlocked, under the conditions of weak signal high sensitivity,
Receiver acquisition time of recapturing is the longest, reaches more than 10 seconds, may miss important communication window in space or Military Application
Mouthful, it is impossible to meet the mission requirements of space communication.Thus, it is necessary to be received the quick of machine loop for this application background
The design of Restoration Mechanism, makes receiver meet this type of application demand.At present, signal flash broken strip part is solved the most targetedly
Under, the locking of receiver fast quick-recovery or the problem keeping persistently locking.
Summary of the invention
The technical problem to be solved in the present invention is that the technical problem existed for prior art, and the present invention provides a kind of the most real
Existing, good reliability, Spread Spectrum Digital receiver signal flash quick capturing method applied widely.
For solve above-mentioned technical problem, the present invention by the following technical solutions:
A kind of Spread Spectrum Digital receiver signal flash quick capturing method, the steps include:
S1: start the real-time testing mechanism to track loop duty under receiver lock-out state；
S2: loop runs toward the direction of offset signal if detecting, then make deviation enumerator from adding, enter step S3；No
Then, if signal flash flag set, step S5 is entered；The non-set of signal flash mark, then backup track loop output,
Return to step S1；
S3: if deviation Counter Value exceedes pre-determined threshold A, then it is assumed that loop losing lock, receiver, by losing lock, terminates；Otherwise,
If deviation Counter Value exceedes pre-determined threshold B, wherein B < A, then it is judged as signal interruption, enters step S4；Otherwise, return to
Step S1；
S4: set signal flash mark, continues to run with tracking, but stops the refreshing makeover process of loop self, return to step
S1；
S5: loop work situation trends towards approach signal, i.e. restrains, it is judged that signal flash process terminates, signal has recovered normal,
It is again introduced into receiver；Clear signal flash mark, resets deviation enumerator；
S6: be loaded into loop without departing from time backup loop output, restart tracking process；
S7: save receiver acquisition process, be directly entered tracking phase, completes centering and has no progeny the fast Acquisition of signal.
As a further improvement on the present invention: in described step S1 and S2, the method for real-time testing mechanism is: receiver de-spreads
The real-time integral and calculating value of rear signal energy, contrasts with the result after persistently this value being carried out low-pass filtering, if calculating in real time
Value is more than result after low-pass filtering, then it is assumed that loop is just at approach signal.
As a further improvement on the present invention: in described step S1 and S2, the method for real-time testing mechanism is: based on the most stagnant
The receiver of rear code ring, current P road, road real-time integral energy value after its despreading, with advanced E road or delayed L road real-time integration energy
Value contrasts, if P road energy value is more than E road and L road, then it is assumed that loop is just at approach signal.
As a further improvement on the present invention: in described step S2, when loop being detected without departing from signal, back up now ring
Road output, including the real-time carrier frequency of signal, spread-spectrum code rate.
As a further improvement on the present invention: in described step S3, having preset and maximum persistently can deviate thresholding A, loop is the most inclined
After number of times is more than A, it is believed that follow the tracks of and will be unable to recover the locking to signal, receiver losing lock；Preset minimum deviation thresholding
B, it is believed that in the case of signal does not interrupts, the lasting deviation number of times that loop maximum possible occurs, deviation number of times is less than B, it is believed that
Signal does not interrupts.
As a further improvement on the present invention: described thresholding A, B require according to receiver performance and track loop technical parameter comes
Arrange, or preset according to the actual test result of receiver tracking loop circuit.
As a further improvement on the present invention: in described step S4, after judging signal interruption, stop loop and utilize its output
Carry out self-recision, it is believed that output now is wrong.
As a further improvement on the present invention: in described step S5, S6, S7, when detecting that loop work situation trends towards connecing
During nearly signal, be loaded into loop without departing from time backup loop output, restart tracking process, carrier wave ring will be big dynamic to have
State leads the FLL mode operation into ability, and code ring also runs with corresponding filtering bandwidth, it is ensured that signal from follow the tracks of directly lead into,
Tighten up the tenacious tracking of the complete pair signals of loop bandwidth.
Compared with prior art, it is an advantage of the current invention that:
1, the Spread Spectrum Digital receiver signal flash quick capturing method of the present invention, under complicated or severe applied environment, wireless communication
Number may short interruption, receiver is how after signal short interruption, it may not be necessary to the recapture of signal and fast quick-recovery connects
Receipts machine normal lock state, thus save the connection setup time.
2, under complicated in military or aerospace etc. or adverse circumstances, signal of communication is likely to occur flash phenomenon.In signal generation flash
Time, the invention enables receiver can be rapidly completed signal and recapture and lock, thus shorten dramatically communication reconstruction time,
Strengthen the robustness of receiver and improve product application power under the severe scene of complexity.
3, the Spread Spectrum Digital receiver signal flash quick capturing method of the present invention, realizes in the 50ms that can break in the signal receiving
The quick lock in of machine loop, the relatively conventional single channel locking time more than 2s clock, reduces due to signal flash or in short-term
Communication interruption probability under abnormal disturbed condition.
4, the Spread Spectrum Digital receiver signal flash quick capturing method of the present invention, it is achieved simply, all kinds of base can be widely used in
In carrier wave ring, the band spread receiver of code ring.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the present invention.
Fig. 2 is the application schematic diagram in instantiation of the present invention on the spaceborne high sensitive receiver of certain model.
Detailed description of the invention
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
As it is shown in figure 1, the Spread Spectrum Digital receiver signal flash quick capturing method of the present invention, the steps include:
S1: start the real-time testing mechanism to track loop duty under receiver lock-out state；
S2: loop runs (loop dissipates) toward the direction of offset signal if detecting, then make deviation enumerator from adding, enter
Enter step S3.Otherwise, if signal flash flag set, step S5 is entered；The non-set of signal flash mark, then back up tracking
Loop (carrier wave ring, code ring) output (carrier frequency value, bit rate value), returns to step S1；
S3: if deviation Counter Value exceedes pre-determined threshold A, then it is assumed that loop losing lock, receiver, by losing lock, terminates.Otherwise,
If deviation Counter Value exceedes pre-determined threshold B (B < A), then it is judged as signal interruption (flash), enters step S4.Otherwise,
Return to step S1；
S4: set signal flash mark, continues to run with tracking, but the refreshing makeover process stopping loop self (thinks now ring
Road output is wrong), return to step S1；
S5: loop work situation trends towards approach signal (convergence), it can be determined that signal flash process terminates, and signal recovers
Normally, it has been again introduced into receiver.Clear signal flash mark, resets deviation enumerator；
S6: be loaded into loop without departing from time backup loop output (carrier frequency value, bit rate value), restart tracking process；
S7: save receiver acquisition process, is directly entered tracking phase, thus complete centering have no progeny signal fast Acquisition (with
Track quick lock in).
In above-mentioned steps S1 and S2, employing the real-time testing mechanism of loop work state, this testing mechanism can distinguish ring
Road is just in offset signal, or loop the most normally follows the tracks of signal.
After loop convergence, due to the impact of background noise, receiver loop output parameter can fluctuate near signal actual value, when
When loop output parameter is close to signal actual value, being integrated despread and demodulated based on this parameter, the integral energy obtained can be big
Energy when loop output parameter offset signal actual value.In the case of useful signal has interrupted, loop output parameter must
So starting lasting offset signal actual value, the most this deviation will be anti-on some real-time power in receiver tracking demodulating process
Mirror.
In concrete application example, the concrete grammar of testing mechanism can be according to the difference of the specifically used track loop of receiver
Different, include but not limited to following methods:
After the despreading of I: receiver, the real-time integral and calculating value of signal energy, is carried out with the result after persistently this value being carried out low-pass filtering
Contrast, if value of calculation is more than result after low-pass filtering in real time, then it is assumed that loop is just at approach signal.
II: based on lead-lag code ring (Early Punctual Late Delay-Lock-Loop hereinafter referred to as EPL-DLL) connect
Receipts machine, current P road, road real-time integral energy value after its despreading, with advanced E road or delayed L road real-time integral energy value carry out right
Ratio, if P road energy value is more than E road and L road, then it is assumed that loop is just at approach signal.
In above-mentioned steps S2, when loop being detected without departing from signal, now loop output should be backed up, real including signal
Time carrier frequency, spread-spectrum code rate.
In above-mentioned steps S3, preset and maximum persistently can deviate thresholding A, loop persistently deviate number of times more than A after, it is believed that with
Track will be unable to recover the locking to signal, receiver losing lock；Preset minimum deviation thresholding B, it is believed that do not interrupt situation at signal
Under, the lasting deviation number of times that loop maximum possible occurs, deviation number of times is less than B, it is believed that signal does not interrupts.Wherein, thresholding
A, B can require according to receiver performance and track loop technical parameter is arranged, it is possible to survey according to receiver tracking loop circuit is actual
Test result is preset.
In above-mentioned steps S4, after judging signal interruption, loop should be stopped and utilizing its output to carry out self-recision, it is believed that now
Output be wrong.
In above-mentioned steps S5, S6, S7, when detecting that loop work situation trends towards approach signal (convergence), should be loaded into
Loop without departing from time backup loop output, restart tracking process, carrier wave ring will lead the lock into ability having Larger Dynamic
Frequently ring mode runs, and code ring also runs with accordingly the biggest filtering bandwidth, it is ensured that signal directly leads into, and then tightening ring from following the tracks of
The tenacious tracking of the complete pair signals of road bandwidth.Owing to eliminating receiver acquisition process, thus greatly save signal after flash
Recapture the time.
As in figure 2 it is shown, after being employing the inventive method, the concrete application example on the spaceborne high sensitive receiver of certain model:
(1) receiver tracking part uses the FLL of classics, phaselocked loop, lead-lag code ring, coherent integrator, frequency mixer
And PN code generator is constituted.After application the inventive method, only increase IIR (Infinite Impulse Response) recurrence
Low pass filter, comparator, enumerator, threshold judgement device (count results comparator) and one group of carrier frequency and bit rate value
Latch.
(2), after receiver locking, the frequency mixer of coherently despreading part and PN (Pseudo Noise) code generator, according to loop
The signal(-) carrier frequency provided and bit rate filter result refreshing (refreshing frequency 1/t) local carrier copy quasi real time and PN code
(by bit rate Indirect method PN code phase), and coherent integrator local carrier and PN code are to ADC (Analog to
Digital Computer) sampling come in data (including echo signal, interference, noise etc.) carry out quadrature demodulation despreading, solve
Adjust result on the one hand to export as receiver symbol, on the one hand have EPL tri-tunnel quadrature demodulation amount to react on track loop and produce new
Filter result, receiver can keep the locking of echo signal in ADC sampled data the most repeatedly；
(3) when echo signal is not interrupted, coherent integration P road energy amp_p (n) of current time n and previous moment (n-1)
Accumulation P road energy low-pass filtering result amp_p_f (n-1) contrasts, owing to having slight shake under loop convergence to follow the tracks of
The change of echo signal, causes the value of amp_p to fluctuate up and down, thus comparator can export deviation instruction blink_en (loop
Offset signal) or do not export (loop approach signal)；
(4) flash decision device erroneous judgement time for avoiding echo signal not interrupt, need to set the count threshold B that flash enters, work as counting
When the loop that device recorded deviates number of times continuously more than B, signal interruption can be judged.Before judging that signal is as interrupting, receive
It is properly functioning that machine tracking is carried on as usual, and enables refreshing and enables (loop_en puts 1)；
(5) setting of thresholding B can estimate according to carrier wave ring, code ring parameter and signal characteristic etc..Echo signal carrier wave in this example
Frequency 1.8GHz, doppler changing rate 500Hz/s, bit rate 1.023Mbps, doppler changing rate 0.284Hz/s.This Rigen
According to carrier wave ring parameter estimation, design PLL frequency is led into scope 50Hz, noise bandwidth 10Hz, coherent integration time 1ms.Letter
Under number tenacious tracking, loop outgoing carrier frequency and the most 10Hz of deviation of signal, then the maximum of B be (50Hz-10Hz)/
(500Hz/s*0.001s)=80, the most maximum continuous 80 loop corrections all deviate, and without restarting tracking, PLL can keep
Lock-out state to signal.PLL in view of actual steady-state operation can not deviate by serial update, and additionally comprehensive coding ring phase place is inclined
The factors such as shifting, noise and interference, the value here presetting at thresholding B is 40～60；
(6) when echo signal is interrupted, the value (echo signal does not exists, and is to make an uproar in the end after despreading) of coherent integrator output error,
Loop filtering result necessarily can not reflect the change direction of signal, and amp_p (n) becomes the end and makes an uproar (the least), and amp_p_f (n-1) is it
Front amp_p, through recursive low pass ripple result, can taper into, cause LPF converge to the end make an uproar near value before (recurrence LPF
During design, its convergence time should be longer than B), the sight of amp_p < amp_p_f occurs continuously, so that flash enumerator reaches
Thresholding B, triggers flash decision device set signal flash mark, and stops refreshing enable (loop_en sets to 0)；
(7) echo signal is interrupted, after flash decision device set signal flash mark, if enumerator continues counting and reaches thresholding A,
Then thinking signal interruption overlong time, even if signal recovers, follow the tracks of the locking that also will be unable to pair signals, receiver is by losing lock；
(8) thresholding A and follow the tracks of FLL and signal carrier change led to the adaptation of code phase deviation and lead into scope and code ring
Entering the factor such as scope, receiver reference frequency degree of stability relevant, in actual application, we only need to attach most importance to the factor that impact is maximum
Consider object.In this example, signal carrier rate of change impact maximum, design FLL frequency is led into scope 200Hz, then door
The maximum of limit A is (200Hz-10Hz)/(500Hz/s*0.001s)=380, it also is contemplated that to noise, interference and code ring code
The factors such as sheet precision, the value of thresholding A presets 200 here；
(9) before rolling counters forward reaches thresholding A, if signal recovers, coherent integrator output result will comprise signal solution
Expand result, have amp_p amp_p_f, flash decision device output tracking loop instruction of restarting, reset enumerator and flag bit, ring
Road, by bringing into operation leading broadband FLL and DLL into ability is higher, is then transitioned into arrowband PLL and DLL, the most again
Lock onto target signal；
(10) be can be seen that by the instantiation of the present invention, the inventive method has simple and practical, low in resources consumption, it is easy to accomplish
Feature.
Below being only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, all belongs to
Technical scheme under thinking of the present invention belongs to protection scope of the present invention.It should be pointed out that, the ordinary skill for the art
For personnel, some improvements and modifications without departing from the principles of the present invention, should be regarded as protection scope of the present invention.
Claims (8)
1. a Spread Spectrum Digital receiver signal flash quick capturing method, it is characterised in that step is:
S1: start the real-time testing mechanism to track loop duty under receiver lock-out state；
S2: loop runs toward the direction of offset signal if detecting, then make deviation enumerator from adding, enter step S3；No
Then, if signal flash flag set, step S5 is entered；The non-set of signal flash mark, then backup track loop output,
Return to step S1；
S3: if deviation Counter Value exceedes pre-determined threshold A, then it is assumed that loop losing lock, receiver, by losing lock, terminates；Otherwise,
If deviation Counter Value exceedes pre-determined threshold B, wherein B < A, then it is judged as signal interruption, enters step S4；Otherwise, return to
Step S1；
S4: set signal flash mark, continues to run with tracking, but stops the refreshing makeover process of loop self, return to step
S1；
S5: loop work situation trends towards approach signal, i.e. restrains, it is judged that signal flash process terminates, signal has recovered normal,
It is again introduced into receiver；Clear signal flash mark, resets deviation enumerator；
S6: be loaded into loop without departing from time backup loop output, restart tracking process；
S7: save receiver acquisition process, be directly entered tracking phase, completes centering and has no progeny the fast Acquisition of signal.
Spread Spectrum Digital receiver signal flash quick capturing method the most according to claim 1, it is characterised in that described step
In rapid S1 and S2, the method for real-time testing mechanism is: the real-time integral and calculating value of signal energy after receiver despreading, with lasting
Result after this value is carried out low-pass filtering contrasts, if value of calculation is more than result after low-pass filtering in real time, then it is assumed that loop is just
At approach signal.
Spread Spectrum Digital receiver signal flash quick capturing method the most according to claim 1, it is characterised in that described step
In rapid S1 and S2, the method for real-time testing mechanism is: receiver based on lead-lag code ring, current P road, road after its despreading
Integral energy value, contrasts with advanced E road or delayed L road real-time integral energy value in real time, if P road energy value is more than E road
And L road, then it is assumed that loop is just at approach signal.
Spread Spectrum Digital receiver signal flash quick capturing method the most according to claim 1, it is characterised in that described step
In rapid S2, when loop being detected without departing from signal, back up now loop output, including the real-time carrier frequency of signal, expansion
Frequency code speed.
5. according to the Spread Spectrum Digital receiver signal flash quick capturing method described in claim 1 or 2 or 3 or 4, its feature
Be, in described step S3, preset and maximum persistently can deviate thresholding A, loop persistently deviate number of times more than A after, it is believed that
Follow the tracks of and will be unable to recover the locking to signal, receiver losing lock；Preset minimum deviation thresholding B, it is believed that do not interrupt feelings at signal
Under condition, the lasting deviation number of times that loop maximum possible occurs, deviation number of times is less than B, it is believed that signal does not interrupts.
Spread Spectrum Digital receiver signal flash quick capturing method the most according to claim 5, it is characterised in that described door
Limit A, B require according to receiver performance and track loop technical parameter is arranged, or survey according to receiver tracking loop circuit is actual
Test result is preset.
7. according to the Spread Spectrum Digital receiver signal flash quick capturing method described in claim 1 or 2 or 3 or 4, its feature
It is, in described step S4, after judging signal interruption, stops loop and utilize its output to carry out self-recision, it is believed that now
Output is wrong.
8. according to the Spread Spectrum Digital receiver signal flash quick capturing method described in claim 1 or 2 or 3 or 4, its feature
It is, in described step S5, S6, S7, when detecting that loop work situation trends towards approach signal, is loaded into loop the most inclined
From time backup loop output, restart tracking process, carrier wave ring will lead the FLL pattern into ability having Larger Dynamic
Run, code ring also runs with corresponding filtering bandwidth, it is ensured that signal from follow the tracks of directly lead into, tighten up the complete pair signals of loop bandwidth
Tenacious tracking.
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| CN101587180A (en) * | 2009-06-12 | 2009-11-25 | 北京北斗星通导航技术股份有限公司 | Flash break recapturing system and method of satellite receiver signal |
| CN104181558A (en) * | 2013-05-24 | 2014-12-03 | 凹凸电子（武汉）有限公司 | GPS receiver and method for judging tracking loop state of GPS receiver |
| CN104793221B (en) * | 2015-04-22 | 2017-08-29 | 上海华测导航技术股份有限公司 | The method that fast Acquisition losing lock signal is realized in satellite signal receiver |
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