CN104101886B - The receiver of a kind of satellite navigation signals and auxiliary code stripping means - Google Patents
The receiver of a kind of satellite navigation signals and auxiliary code stripping means Download PDFInfo
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- CN104101886B CN104101886B CN201310122646.2A CN201310122646A CN104101886B CN 104101886 B CN104101886 B CN 104101886B CN 201310122646 A CN201310122646 A CN 201310122646A CN 104101886 B CN104101886 B CN 104101886B
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention provides receiver and the auxiliary code stripping means thereof of a kind of satellite navigation signals；Method includes: the modulation navigation message of the 100bps of track loop output is carried out string synchronization, it is thus achieved that the position of 30 bit synchronous heads；Adjust the distance with the frequency of 100Hz and peel off the time span of period start time and judge, produce the synchronous head sequence of every 10ms upset " 0 ", " 1 " sequence or 30 bits once according to judged result；Described stripping period start time is the moment that the last modulation navigation message 30 bit synchronous head terminates；Sequence according to 1ms correlation and generation obtains coherent accumulation values, during for described track loop and decoding.The present invention can strengthen the tracking sensitivity of GPS Satellite navigation.
Description
Technical field
The present invention relates to navigation field, particularly relate to receiver and the auxiliary code stripping means of a kind of satellite navigation signals.
Background technology
GLONASS (GLObal Navigation Satellite System, GPS) is the former Soviet Union
On the basis of comprehensive summing up 1st generation satellite navigation system CICADA, from October nineteen eighty-two, constantly launch 2nd generation navigation
Satellite, the 2nd generation satellite navigation system progressively built up.At the bottom of nineteen ninety-five, it is complete that GLONASS system organizes star first, and formal input makes
With.
GLONASS constellation is made up of 24 satellites on three orbit planes being distributed in ascending node and respectively differing 120 °, 8
Satellite differs 45 ° with a liter friendship elongation and is equally arranged in each orbital plane.In satellite in each orbit plane and other plane
Satellite have 15 ° rise friendship elongation deviation.Satellite operates on the circuit orbit of 19100km with 64.8 ° of inclination angle, satellite transit one
Week is about 11 hours 15 minutes.The distribution of these satellites can provide the Global coverage of continuous print earth surface and terrestrial space.
Interface between the space segment of GLONASS navigation signal and subscriber equipment is made up of L-band radio link.Respectively
GLONASS satellite sends navigation signal with two sub-bands (L1 1.6GHz and L2 1.2GHz) of L-band.GLONASS is at L1
With use frequency division multiple access (FDMA) technology on L2 sub-band, the most each satellite uses respective carrier wave to send on L1 and L2 sub-band
Navigation signal.If located in have in single track plane two just relative to satellite, then they can send out with identical carrier frequency
Send navigation signal.
The modulation sequence that carrier frequency modulation (when producing standard accuracy signal) on L1 sub-band uses is by following
The mould 2 of three kinds of binary signals and generation:
(1) the pseudorandom ranging code launched with 511kbps；
(2) navigation information launched with 50bps；
(3) 100Hz auxiliary square wave i.e. Meander Code (being hereinafter referred to as auxiliary code).
The modulation sequence that carrier frequency modulation (when producing standard accuracy signal) in L2 subsegment uses is by following three
Plant the mould 2 of binary signal and produce:
(1) the pseudorandom ranging code launched with 511kbp s；
(2) navigation information launched with 50bps；
(3) 100Hz assists square wave, i.e. Meander Code (is hereinafter referred to as auxiliary code).
When producing standard accuracy signal, with given sequence, the carrier wave on L1 and L2 sub-band is modulated.
Pseudorandom ranging code be shift register be 1 millisecond (ms) in the cycle, greatest length sequence during bit rate 511kbp s
Row.
GLONASS navigation message is a kind of binary code, and is encoded outwards broadcast by Hamming code (Hamming Code) mode
Send.One complete navigation message is made up of 1 superframe (Super frame), and each superframe is made up of 5 frames (Frame),
Each frame is made up of 15 strings (String) again, and string is equivalent to the subframe in gps navigation message.String is the ultimate unit of frame.As
Shown in Fig. 1, each string is divided into data bit and time labelling two large divisions.One long 2s of string, at last 0.3s transmission time mark
Note, time labelling is made up of 30 code elements, each code length 10ms.85 data bits are transmitted at front 1.7s.
Position sequence number in each string is by order arrangement from right to left.Almanac data takies the 9th～84, Hamming code inspection effect code
(KX) taking the 1st～8, last 1 (the 85th) is spare bits (" 0 ").Utilize time labelling MB mutually isolated between adjacent string.
The navigation message data stream referred to as " modulation text " that 100kps auxiliary code will be utilized to modulate herein, and will be with
The navigation message data stream that 50bps launches is referred to as " original text "
It is that GPS receiver carries out pseudo range measurement and then realizes location that the signal of certain satellite realizes tracking
The premise resolved.Tracking sensitivity is that tolerance GPS receiver follows the tracks of ability or even GPS receiver is whole
The important indicator of body performance.One basic method strengthening satellite navigation system tracking ability is the pre-detection improving track loop
The time of integration, carry out long integration.Conventional integrated form includes retaining the coherent integration of phase information and not retaining phase
The non-coherent integration of position information.Wherein, the snr gain that coherent integration obtains is higher.And depositing due to unknown navigation message
, coherent integration time is generally difficult to exceed the bit length of navigation message.Compare with the GPS system of the U.S., GLONASS system
There is the Meander Code of 100bps, cause the relevant pre-correlation of conventional method not can exceed that 10ms, this greatly limits
Make the raising of GLONASS receiver tracking sensitivity.
The synchronous head of GLONASS system is 30 bits, and its value is:
111110001101110101000010010110。
In traditional design, usual tracking channel only does the coherent integration of the longest 10ms and not across auxiliary code border, and defeated
Go out the telegraph text data stream of the auxiliary code modulation of 100bps.Decoded message module directly processes the text of the auxiliary code modulation of 100bps
Data stream, and in this module, peel off auxiliary code.So on the one hand, cause decoded message resume module bulk redundancy information, simultaneously
Owing to coherent integration time causes decoding sensitivity decrease less than or equal to 10ms.The more important thing is, owing to coherent integration time is little
In causing the reduction of tracking sensitivity equal to 10ms, cause the decline of Consumer's Experience.
In the GPS system close with GLONASS system, it is relevant long-pending that some designs use so-called bit auxiliary to solve
The problem of timesharing span bit boundaries.The core of the method is to utilize the periodicity of text, it was predicted that in the signal being newly received
The phase bit flipping caused due to navigation message polarity, and peeled off, facilitate coherent integration.But due to the existence of auxiliary code,
Extra work amount is brought, it is often more important that add the quantity needing Storage Estimation navigation message bit, waste to prediction
Memory headroom, the redundancy of effort amount of navigation message decoder module does not reduce simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is that the tracking of the satellite navigation how strengthening GPS is sensitive
Degree.
In order to solve the problems referred to above, the invention provides the receiver of a kind of satellite navigation signals, including:
Correlator, track loop, decoding unit, coherent accumulation unit；
Position and speed time solving unit, including string synchronization module；Described string synchronization module is for described track loop
The modulation navigation message of the 100bps of output carries out string and synchronizes, it is thus achieved that the position of 30 bit synchronous heads；
Auxiliary code hardware detacher, for adjusting the distance with the frequency of 100Hz, the time span peeling off period start time is entered
Row judges, according to judged result produce the synchronous head sequence of every 10ms upset " 0 ", " 1 " sequence or 30 bits once export to
Described coherent accumulation unit；Described stripping period start time is that the last modulation navigation message 30 bit synchronous head terminates
Moment；
Described coherent accumulation unit for according to by described correlator be correlated with obtain 1ms correlation and auxiliary code hardware stripping
Sequence from device output produces coherent accumulation values, is sent to described track loop and decoding unit.
Further, described position and speed time solving unit is obtained 30 bits by described auxiliary code hardware detacher first
The moment of synchronous head position or the time span of distance stripping period start time reach the moment of 2 seconds, lead as described modulation
The moment that avionics literary composition 30 bit synchronous heads terminate.
Further, described auxiliary code hardware detacher exports the same of " 0 ", " 1 " sequence or 30 bits according to judged result
Step header sequence refers to described coherent accumulation unit:
If the time span that described distance peels off period start time less than 2 seconds and meets or exceeds 1.7 seconds, then described
The synchronous head sequence that auxiliary code hardware detacher produces 30 bits according to the frequency of 100Hz exports to described coherent accumulation unit；
If less than 1.7 seconds, the most described auxiliary code hardware detacher according to the frequency of 100Hz produce every 10ms upset " 0 " once,
" 1 " sequence exports to described coherent accumulation unit.
Further, the sequence that described coherent accumulation unit exports according to 1ms correlation and described auxiliary code hardware detacher
The produced coherent accumulation values length of row is at least 20ms；
The original navigation text of the 50bps that described decoding unit exports with coherent accumulation unit is for input.
Further, described auxiliary code hardware detacher includes:
Upset sequence generator, for producing every 10ms upset " 0 ", " 1 " sequence once with the frequency of 100Hz；
Synchronous head maker, for producing the synchronous head sequence of 30 bits with the frequency of 100Hz；
Selector, for according to enabling signal in the sequence that described upset sequence generator and synchronous head maker produce
Middle selection one tunnel exports to described coherent accumulation unit；
Auxiliary code enumerator, for increasing 1 with the frequency of 100Hz by count value, according to the frequency of 100Hz to described count value
Judge, if this count value is less than 200 and more than or equal to 170, then produces instruction and select making of described synchronous head sequence
Described selector can be given by signal；If described count value is less than 170, then produces instruction and select described " 0 ", the enable of " 1 " sequence
Signal gives described selector；If described count value is more than or equal to 200, then described count value is set to 0；
Described string synchronization module is the position of 30 bit synchronous heads in the modulation text stream obtain for the first time described 100bps
Time, the count value of described auxiliary code enumerator is set to 0.
Present invention also offers the auxiliary code stripping means of a kind of satellite navigation signals, including:
The modulation navigation message of the 100bps of track loop output is carried out string synchronization, it is thus achieved that the position of 30 bit synchronous heads
Put；
With the frequency of 100Hz adjust the distance peel off period start time time span judge, according to judged result produce
The synchronous head sequence of raw every 10ms upset " 0 ", " 1 " sequence or 30 bits once；Described stripping period start time is nearest
The moment that primary modulation navigation message 30 bit synchronous head terminates；
Sequence according to 1ms correlation and generation obtains coherent accumulation values, during for described track loop and decoding.
Further, the moment that described modulation navigation message 30 bit synchronous head terminates is to obtain 30 bit synchronous heads first
The moment of position or the time span of distance stripping period start time reach the moment of 2 seconds.
Further, refer to according to the synchronous head sequence of judged result generation " 0 ", " 1 " sequence or 30 bits:
If the time span that described distance peels off period start time less than 2 seconds and meets or exceeds 1.7 seconds, then produce
The synchronous head sequence of 30 bits；If less than 1.7 seconds, then produce every 10ms upset " 0 ", " 1 " sequence once.
Further, the coherent accumulation values length obtained according to the sequence of 1ms correlation and generation is at least 20ms；Solve
It is with the original navigation text of the 50bps after coherent accumulation for input during code.
Further, described method also includes:
Count in the way of the frequency of 100Hz increases 1；
Adjust the distance and peel off the time span of period start time and carry out judgement and refer to determine apart from described according to count value
Peel off the time span of period start time；
At the end of modulation navigation message 30 bit synchronous head, described count value is set to 0.
Technical scheme advantage is:
1) coherent integration time of 20ms can be realized, improve the sensitivity about 3dB of tracking.
2) utilize hardware to realize the stripping of auxiliary code, facilitate subsequent treatment.
3) after peeling off auxiliary code, the thresholding of decoded message declines 3dB, more weak signal can be completed decoded message.
4) decoded message module need not peel off auxiliary code again, simplifies decoding operation.
Accompanying drawing explanation
Fig. 1 is GLONASS text type of organization schematic diagram；
Fig. 2 is the schematic block diagram of the receiver of the satellite navigation signals of embodiment one；
Fig. 3 is the schematic block diagram of the auxiliary code hardware detacher of embodiment one；
Fig. 4 is the schematic flow sheet of object lesson in embodiment two.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme is described in detail.
If it should be noted that do not conflict, each feature in the embodiment of the present invention and embodiment can mutually be tied
Close, all within protection scope of the present invention.
Embodiment one, the receiver of a kind of satellite navigation signals, as in figure 2 it is shown, include:
Correlator, track loop, decoding unit, coherent accumulation unit；
PVT (Position, velocity, Time, position, speed, time) solving unit, including string synchronization module；Institute
State string synchronization module to synchronize for the modulation navigation message of the 100bps that described track loop exports carries out string, it is thus achieved that 30bit
The position of synchronous head；
Auxiliary code hardware detacher, for adjusting the distance with the frequency of 100Hz, the time span peeling off period start time is entered
Row judges, the synchronous head sequence producing every 10ms upset " 0 ", " 1 " sequence or 30bit once according to judged result exports to institute
State coherent accumulation unit；Described stripping period start time be the last modulation navigation message 30 bit synchronous head terminate time
Carve；
Described coherent accumulation unit for according to by correlator be correlated with obtain 1ms correlation and described auxiliary code hardware stripping
Sequence from device output produces coherent accumulation values, is sent to described track loop and decoding unit.
Wherein, correlator and the relevant processing procedure obtaining 1ms correlation thereof can refer to existing navigation signal receiver
Realize.
In the present embodiment, described position and speed time solving unit can be obtained 30 by described auxiliary code hardware detacher first
The moment of bit synchronous head position or the time span of distance stripping period start time reach the moment of 2 seconds, as described tune
The moment that navigation message 30 bit synchronous head processed terminates.
In the present embodiment, described auxiliary code hardware detacher is same according to judged result output " 0 ", " 1 " sequence or 30bit's
Step header sequence specifically may refer to described coherent accumulation unit:
If the time span that described distance peels off period start time less than 2 seconds and meets or exceeds 1.7 seconds, then described
The synchronous head sequence that auxiliary code hardware detacher produces 30bit according to the frequency of 100Hz exports to described coherent accumulation unit；As
Fruit was less than 1.7 seconds, and the most described auxiliary code hardware detacher produces every 10ms upset " 0 ", " 1 " once according to the frequency of 100Hz
Sequence exports to described coherent accumulation unit.
In the present embodiment, described auxiliary code hardware detacher is as it is shown on figure 3, specifically may include that
Upset sequence generator, for producing every 10ms upset " 0 ", " 1 " sequence once with the frequency of 100Hz；
Synchronous head maker, for producing the synchronous head sequence of 30bit with the frequency of 100Hz；
Selector, for according to enabling signal in the sequence that described upset sequence generator and synchronous head maker produce
Middle selection one tunnel exports to described coherent accumulation unit；
Auxiliary code enumerator, for increasing 1 with the frequency of 100Hz, and according to the frequency of 100Hz to described counting by count value
Value judges, if this count value less than 200 and more than or equal to 170 (i.e. apart from described stripping period start time time
Between length less than 2 seconds and meet or exceed 1.7 seconds), then produce instruction select described synchronous head sequence enable signal give described
Selector；If described count value less than 170 (i.e. apart from the time span of described stripping period start time less than 1.7 seconds),
Then generation instruction selection described " 0 ", the enable signal of " 1 " sequence give described selector；If described count value is more than or equal to
200 (i.e. the time span apart from described stripping period start time meets or exceeds 2 seconds, and common situation should be just to reach
By 2 seconds, typically do not have the situation more than 2 seconds), then described count value is set to 0.
Described string synchronization module is the position of 30bit synchronous head in the modulation navigation message stream obtain for the first time described 100bps
When putting, initialize described auxiliary code enumerator, will the count value of auxiliary code enumerator set to 0.
Certainly, during actual application, described auxiliary code hardware detacher is also not necessarily limited to use the count value of auxiliary code enumerator
Carry out recording distance and peel off the time span of period start time, it would however also be possible to employ other timing means or mode.
In the present embodiment, described coherent accumulation unit exports according to 1ms correlation and described auxiliary code hardware detacher
The coherent accumulation values length that sequence is obtained is at least 20ms.
In the present embodiment, the original navigation text of the 50bps that described decoding unit exports with coherent accumulation unit is for input.
The local auxiliary code sequence that bit rate is 100bps of auxiliary code is generated, by this sequence by auxiliary code hardware detacher
It is input to coherent accumulation unit, then can obtain the coherent accumulation values of at least 20ms.This coherent accumulation values is exported to following the tracks of ring
Road, then can improve tracking sensitivity.Meanwhile, this coherent accumulation values is exported to decoding unit, then improving decoding sensitivity
While, the directly original navigation text of output 50bps, rather than the modulation navigation message of 100bps, therefore decrease decoding single
The redundant operation of unit.
The present embodiment, in order to solve the shortcoming designed in the past, expands the time of integration to 20ms from original 10ms.At place
The when of reason integrated value, the string in original 2s cycle is divided into the telegraph text data of two parts: 1.7s and the synchronous head of 0.3s.
The former with " 0 ", the auxiliary code modulation of " 1 ", therefore can overturn upset sequence once with every 10ms raw in each 20ms
Grow up to be a useful person and produce auxiliary code and peel off.The latter is not to use " 0 ", the modulation of " 1 " auxiliary code, but a fixing sequence,
Therefore can generate this sequence with the synchronous head maker of a 30bit to peel off.After the position of synchronous head determines
(after i.e. completing string synchronization), can complete the former and the alternately switching of the latter with a time switch.Peel off auxiliary code and with
After step head, it is possible to ensure coherent accumulation time lengthening at least 20ms.
Embodiment two, the auxiliary code stripping means of a kind of satellite navigation signals, including:
The modulation navigation message of the 100bps of track loop output is carried out string synchronization, it is thus achieved that the position of 30bit synchronous head；
With the frequency of 100Hz adjust the distance peel off period start time time span judge, according to judged result produce
The synchronous head sequence of raw every 10ms upset " 0 ", " 1 " sequence or 30bit once；Described stripping period start time is nearest one
The moment that secondary described modulation navigation message 30 bit synchronous head terminates；
Sequence according to 1ms correlation and generation obtains coherent accumulation values, during for described track loop and decoding.
In the present embodiment, the moment that described modulation navigation message 30 bit synchronous head terminates can be to obtain 30 bits first
The moment of synchronous head position or the time span of distance stripping period start time reach the moment of 2 seconds.
In the present embodiment, the synchronous head sequence producing " 0 ", " 1 " sequence or 30bit according to judged result can be specifically
Refer to:
If the time span that described distance peels off period start time less than 2 seconds and meets or exceeds 1.7 seconds, then produce
The synchronous head sequence of 30bit；If less than 1.7 seconds, then produce every 10ms upset " 0 ", " 1 " sequence once.
In the present embodiment, described method can also include:
Count in the way of the frequency of 100Hz increases 1；
Adjust the distance and peel off the time span of period start time and carry out judgement and refer to determine apart from described according to count value
Peel off the time span of period start time.
Certainly, the time that may be used without the mode recording distance stripping period start time such as timer during actual application is long
Degree.
In the present embodiment, at the end of modulation navigation message 30 bit synchronous head, described count value is set to 0.
In the present embodiment, it is at least 20ms according to the coherent accumulation values length that the sequence of 1ms correlation and generation is obtained；
It is with the original navigation text of the 50bps after coherent accumulation for input during decoding.
In one specific example, carry out timing with the auxiliary code enumerator in embodiment one, this example as shown in Figure 4,
Including:
701, the modulation navigation message utilizing 100bps carries out string and synchronizes；Synchronizing if completing string, detecting whether as same first
Step, if synchronizing first, then initializes auxiliary code enumerator, its count value is set to 0, then carry out step 702；No
Then return step 701.
702, the count value of auxiliary code enumerator starts to increase 1 with the speed of 100Hz.Carry out step 703.
703, judge that the count value of auxiliary code enumerator, whether more than or equal to 200, if it is will with the frequency of 100Hz
Count value is set to 0, returns step 702；If less than 200 judge this count value whether more than or equal to 170, if it is
Carry out step 704；If it is not, then carry out step 705；
704, with the rate-adaptive pacemaker synchronous head sequence of 100Hz, step 702 is returned.
705, with rate-adaptive pacemaker " 0 ", " 1 " sequence of 100Hz, step 702 is returned.
Certainly, the present invention also can have other various embodiments, in the case of without departing substantially from present invention spirit and essence thereof, ripe
Know those skilled in the art to work as and can make various corresponding change and deformation according to the present invention, but these change accordingly and become
Shape all should belong to the scope of the claims of the present invention.
Claims (8)
1. a receiver for satellite navigation signals, including:
Correlator, track loop, decoding unit, coherent accumulation unit；
Position and speed time solving unit, including string synchronization module；Described string synchronization module is for exporting described track loop
The modulation navigation message of 100bps carry out string and synchronize, it is thus achieved that the position of 30 bit synchronous heads；
It is characterized in that, also include:
Auxiliary code hardware detacher, for adjusting the distance with the frequency of 100Hz, the time span peeling off period start time is sentenced
Disconnected, the synchronous head sequence producing every 10ms upset " 0 ", " 1 " sequence or 30 bits once according to judged result exports to described
Coherent accumulation unit；Described stripping period start time be the last modulation navigation message 30 bit synchronous head terminate time
Carve；
Described coherent accumulation unit is for according to the 1ms correlation and auxiliary code hardware detacher obtained of being correlated with by described correlator
The sequence of output produces coherent accumulation values, is sent to described track loop and decoding unit；
Described auxiliary code hardware detacher is given described according to the synchronous head sequence of judged result output " 0 ", " 1 " sequence or 30 bits
Coherent accumulation unit refers to:
If the time span that described distance peels off period start time less than 2 seconds and meets or exceeds 1.7 seconds, the most described auxiliary
The synchronous head sequence that code hardware detacher produces 30 bits according to the frequency of 100Hz exports to described coherent accumulation unit；If
Less than 1.7 seconds, the most described auxiliary code hardware detacher produced every 10ms upset " 0 ", " 1 " sequence once according to the frequency of 100Hz
Row output is to described coherent accumulation unit.
2. receiver as claimed in claim 1, it is characterised in that:
Described position and speed time solving unit is obtained 30 bit synchronous head positions by described auxiliary code hardware detacher first
The time span of moment or distance stripping period start time reaches the moment of 2 seconds, as described modulation navigation message 30 bit
The moment that synchronous head terminates.
3. receiver as claimed in claim 1, it is characterised in that:
Described coherent accumulation unit is according to relevant produced by the sequence of 1ms correlation and the output of described auxiliary code hardware detacher
Accumulated value length is at least 20ms；
The original navigation text of the 50bps that described decoding unit exports with coherent accumulation unit is for input.
4. the receiver as according to any one of Claim 1-3, it is characterised in that described auxiliary code hardware detacher includes:
Upset sequence generator, for producing every 10ms upset " 0 ", " 1 " sequence once with the frequency of 100Hz；
Synchronous head maker, for producing the synchronous head sequence of 30 bits with the frequency of 100Hz；
Selector, for according to enabling signal middle choosing in the sequence that described upset sequence generator and synchronous head maker produce
Select a road to export to described coherent accumulation unit；
Auxiliary code enumerator, increases 1 for the frequency with 100Hz by count value, carries out described count value according to the frequency of 100Hz
Judge, if this count value is less than 200 and more than or equal to 170, then produces instruction and select the enable letter of described synchronous head sequence
Number give described selector；If described count value is less than 170, then produces instruction and select described " 0 ", the enable signal of " 1 " sequence
To described selector；If described count value is more than or equal to 200, then described count value is set to 0；
Described string synchronization module, will when first time obtains the position of 30 bit synchronous heads in the modulation text stream of described 100bps
The count value of described auxiliary code enumerator sets to 0.
5. an auxiliary code stripping means for satellite navigation signals, including:
The modulation navigation message of the 100bps of track loop output is carried out string synchronization, it is thus achieved that the position of 30 bit synchronous heads；
Adjust the distance with the frequency of 100Hz and peel off the time span of period start time and judge, produce every according to judged result
The synchronous head sequence of 10ms upset " 0 ", " 1 " sequence or 30 bits once；Described stripping period start time is the last
The moment that modulation navigation message 30 bit synchronous head terminates；
Sequence according to 1ms correlation and generation obtains coherent accumulation values, during for described track loop and decoding；
The synchronous head sequence producing " 0 ", " 1 " sequence or 30 bits according to judged result refers to:
If the time span that described distance peels off period start time less than 2 seconds and meets or exceeds 1.7 seconds, then produce 30 ratios
Special synchronous head sequence；If less than 1.7 seconds, then produce every 10ms upset " 0 ", " 1 " sequence once.
6. method as claimed in claim 5, it is characterised in that:
The moment that described modulation navigation message 30 bit synchronous head terminates be obtain first 30 bit synchronous head positions moment or
The time span of distance stripping period start time reaches the moment of 2 seconds.
7. method as claimed in claim 5, it is characterised in that:
The coherent accumulation values length that sequence according to 1ms correlation and generation is obtained is at least 20ms；It is with relevant during decoding
The original navigation text of the 50bps after Lei Jia is input.
8. the method as according to any one of claim 5 to 7, it is characterised in that also include:
Count in the way of the frequency of 100Hz increases 1；
Adjust the distance and peel off the time span of period start time and carry out judgement and refer to determine apart from described stripping according to count value
The time span of period start time；
At the end of modulation navigation message 30 bit synchronous head, described count value is set to 0.
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