CN106338751A - Satellite signal bit synchronization method and device, and navigation receiver - Google Patents
Satellite signal bit synchronization method and device, and navigation receiver Download PDFInfo
- Publication number
- CN106338751A CN106338751A CN201510991156.5A CN201510991156A CN106338751A CN 106338751 A CN106338751 A CN 106338751A CN 201510991156 A CN201510991156 A CN 201510991156A CN 106338751 A CN106338751 A CN 106338751A
- Authority
- CN
- China
- Prior art keywords
- data
- bit
- millisecond
- group
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
Abstract
The invention is applicable to the field of navigation, and provides a satellite signal bit synchronization method, a satellite signal bit synchronization device and a navigation receiver. The satellite signal bit synchronization method comprises the steps of: assuming N kinds of situations according to bit periods of a GPS system and a Beidou satellite navigation system, wherein N is equal to the number of milliseconds of one bit period, and each situation corresponds to one situation that I branch data and Q branch data read in one millisecond within one bit period serve as I branch data and Q branch data of a first millisecond of 1 piece of bit data separately; performing FFT operation on N groups of sequences corresponding to the N kinds of situations to obtain N groups of corresponding results; and comparing the N groups of results to obtain the maximum value, and regarding a position of the first millisecond of the result group corresponding to the maximum value as an initial position of the bit period, so as to realize satellite signal bit synchronization. The satellite signal bit synchronization method provided by the invention can be compatible with the Beidou satellite navigation system and the GPS system, and realizes satellite signal bit synchronization.
Description
Technical field
The invention belongs to navigation field, the bit synchronous method of more particularly, to a kind of satellite-signal, device and navigation
Receiver.
Background technology
Beidou satellite navigation system and gps system are all global positioning systems, play in present life
More and more important effect, in occupation of very important position in navigation, positioning, time service, the field such as test the speed
Put.The Beidou satellite navigation system of China is fast-developing, supports that gps system and big-dipper satellite are led simultaneously
The navigation neceiver of boat system will be more and more universal.Navigation neceiver generally includes: antenna, radio frequency mould
Block, baseband signal processing module and other application module.Wherein, baseband signal processing module major function bag
Include the satellite searching on sky and demodulate correct navigation message, produce for navigating, positioning, time service,
The measured value of application such as test the speed.Bit synchronization, i.e. bit synchronous, equally have very heavy in navigation neceiver
The effect wanted.After searching satellite, navigation neceiver can be tracked to this satellite locking, and goes forward side by side
The success of line position synchronization process, only bit synchronization, just can determine that the bit boundaries of signal, and then determines signal
Bit.After navigation neceiver receives the correct bit of this satellite, frame synchronization process is carried out to it, obtains
The navigation message of this satellite is thus carry out positioning calculation.It is hereby understood that bit synchronization has in navigation neceiver
Play a very important role, only correctly carry out bit synchronization process, could successfully search star and participate in positioning, and
And bit synchronous performance quality directly affects the acquisition sensitivity of navigation neceiver.
In gps system, signal that each satellite sends all by with this satellite uniquely corresponding pseudo noise code
(pseudo-random noise, prn) is modulated, and cycle of pseudo noise code is 1ms, thus through puppet with
Machine code modulation after data signal be the cycle be 1ms thick code (ca code)；Each navigation data signal will
It is repeated 20 times to ensure the transmitting not having under mechanism for correcting errors, the cycle of gps data bit signal is 20ms.
When the ca code signal that track loop is exported is demodulated, first have to 1000b/s's by bit synchronization
Ca code signal is changed into the low and high level of 50b/s.
Beidou satellite navigation system, employs the data modulations different with gps system, to geostationary
Orbiter (geostationary earth orbit, geo) satellite, the cycle of pseudo noise code is also 1ms,
But each data bit is 2ms, similar with gps system, there is not the saltus step of symbol inside data bit,
After making some changes, can be using the method similar with gps system during bit synchronization.Earth's orbit is justified in centering
(medium earth orbit, meo) satellite and inclination geostationary orbit (inclined
Geosynchronous satellite orbit, igso) satellite, the cycle of pseudo noise code is also 1ms, equally,
Each Big Dipper data signal will be repeated 20 times to ensure the transmitting not having under mechanism for correcting errors, with gps
Unlike system, each central 20ms data employs nh (neumann-hoffman) code and adjusts
System, that is, there is also the saltus step of symbol inside each data is so, identical using gps signal
Bit synchronous method be not just suitable for meo, igso satellite-signal of Beidou satellite navigation system.
Content of the invention
It is an object of the invention to provide the satellite of a kind of energy compatibility Beidou satellite navigation system and gps system
The bit synchronous method of signal, device and navigation neceiver.
In a first aspect, the invention provides a kind of bit synchronous method of satellite-signal, methods described includes:
, it is assumed that n kind situation, n is equal to one for bit period according to gps system and Beidou satellite navigation system
The millisecond quantity of individual bit period, each situation corresponds to wherein one millisecond reading in a bit period respectively
The i branch data got and q branch data are as the i branch data of first millisecond of 1 bit data
Situation with q branch data；
Respectively the n group sequence corresponding to n kind situation is carried out fft computing, obtain the corresponding result of n group；
Compare the size of n group result, obtain maximum, by first millisecond of corresponding for maximum result group
Position as bit period original position, thus realizing satellite-signal bit synchronization.
Second aspect, the invention provides a kind of bit synchronous device of satellite-signal, described device includes:
Assume module, for the bit period according to gps system and Beidou satellite navigation system it is assumed that n kind
Situation, n is equal to the millisecond quantity of a bit period, and each situation corresponds in a bit period respectively
The i branch data that wherein a millisecond reads and q branch data as 1 bit data first milli
The i branch data of second and the situation of q branch data；
Fft computing module, for respectively the n group sequence corresponding to n kind situation being carried out fft computing, obtains
To the corresponding result of n group；
Comparison module, for comparing the size of n group result, obtains maximum, by corresponding for maximum result
Group first millisecond position as bit period original position, thus realizing satellite-signal bit synchronization.
The third aspect, the invention provides a kind of navigation neceiver, described navigation neceiver includes above-mentioned defending
The bit synchronous device of star signal.
In the present invention, due to the bit period according to gps system and Beidou satellite navigation system it is assumed that n
The situation of kind, each situation corresponds to the i circuitry number that wherein a millisecond reads in a bit period respectively
According to q branch data as the i branch data of first millisecond of 1 bit data and q branch data
N group sequence corresponding to n kind situation is carried out fft computing, obtains the corresponding knot of n group by situation respectively
Really；Compare the size of n group result, obtain maximum, by first millisecond of corresponding for maximum result group
Position as bit period original position, thus realizing satellite-signal bit synchronization.Thus while the Big Dipper is defended
Star navigation system is different with the cycle of the data bit signal of gps system, but the bit synchronization method of the present invention is still
The compatible Beidou satellite navigation system of energy and gps system, realize satellite-signal bit synchronization.
Further, since being respectively multiplied by of all bit periods in an accumulation period is corresponded to default amplitude
The value of the corresponding millisecond of every group of bit data afterwards is added up, and obtains one group of accumulated value；Or, respectively will
The corresponding one group of real outcomes of every group of bit data of all bit periods in one accumulation period are added.Cause
Even if this is when signal is weaker, also can bit synchronization success well.
Brief description
Fig. 1 is the flow chart of the bit synchronous method of satellite-signal that the embodiment of the present invention one provides.
Fig. 2 is the flow chart of the bit synchronous method of satellite-signal that the embodiment of the present invention two provides.
Fig. 3 is the structural representation of the bit synchronous device of satellite-signal that the embodiment of the present invention three provides.
Specific embodiment
In order that the purpose of the present invention, technical scheme and beneficial effect become more apparent, below in conjunction with accompanying drawing
And embodiment, the present invention will be described in further detail.It should be appreciated that described herein be embodied as
Example, only in order to explain the present invention, is not intended to limit the present invention.
In order to technical solutions according to the invention are described, to illustrate below by specific embodiment.
Embodiment one:
Refer to Fig. 1, the bit synchronous method of satellite-signal that the embodiment of the present invention one provides comprises the following steps:
S101, according to the bit period of gps system and Beidou satellite navigation system it is assumed that n kind situation, n
Equal to the millisecond quantity of a bit period, each situation corresponds to wherein in a bit period respectively
The i branch data that millisecond reads and q branch data prop up as the i of first millisecond of 1 bit data
Circuit-switched data and the situation of q branch data；
S102, respectively the n group sequence corresponding to n kind situation is carried out fft computing, obtain n group and correspond to
Result；
S103, compare the size of n group result, obtain maximum, by the first of corresponding for maximum result group
The position of individual millisecond is as the original position of bit period, thus realizing satellite-signal bit synchronization.
Embodiment two:
Refer to Fig. 2, the bit synchronous method of satellite-signal that the embodiment of the present invention two provides comprises the following steps:
S201, every millisecond read i branch data and q branch data from Satellite Tracking passage.
Navigation neceiver (such as gps receiver, Beidou receiver) generally adopts i/q to solve in tracking module
Tune method come to help through the carrier wave of input signal is peeled off, the task such as phase demodulation data demodulation.By input signal
(ui (t)=ad (t) sin (wit+ θ i)+n, wherein a are signal amplitude, and d (t) is bit data level, is worth for ± 1,
Wi is carrier frequency, and θ i is phase place, and n represents noise), with sinusoidal carrier replica signal (uos (t)=sin (wot+
θ o)) that loop branch of being mixed is referred to as in-phase branch (i branch road), and with cosine carrier replica signal
Another loop branch that (uos (t)=cos (wot+ θ o)) is mixed is referred to as quadrature branch (q branch road).Following the tracks of
Module, result after mixing, low-pass filtering for the i branch road is i=ad (t) cos (wet+ θ e), and q branch road is through mixed
Frequently, the result after low-pass filtering be q=ad (t) sin (wet+ θ e), wherein we be input signal carrier wave with
Replicate the difference of carrier wave, θ e is input signal phase place and the difference replicating phase place.Lock phase through tracking module
After ring, FLL locking, we, θ e just can be used to represent bit close to 0, the then symbol of i, q
The symbol of data level d (t).
In the embodiment of the present invention two it is assumed that read i branch data and q branch data numbering be i1,
Q1, i2, q2 ... i20, q20；I21, q21, i22, q22 ... i40, q40；I41, q41, i42,
Q42 ... im, qm, wherein, which millisecond m represents.
S202, the i branch data that every millisecond in a bit period is read and q branch data are respectively
I branch data as first millisecond of 1 bit data and q branch data, in conjunction with following bit week
I branch data and q branch data that in phase every millisecond reads, thus by the adjacent dibit cycle
Data displacement is combined into n group bit data, and every group of bit data includes n i branch data and n q
Branch data, wherein, n is equal to the millisecond quantity of a bit period.
In the embodiment of the present invention two, the bit period of gps satellite is 20ms, the ratio of Big Dipper geo satellite
The special cycle is 2ms, and the bit period of Big Dipper meo, igso satellite is 20ms.
For gps satellite, Big Dipper meo, igso satellite it is assumed that 20 kinds of situations, be respectively as follows: i1,
Q1 is i branch data and the q branch data of first millisecond of 1 bit data, and i2, q2 are 1
The i branch data of first millisecond of bit data and q branch data, i3, q3 are 1 bit data
The i branch data of first millisecond and q branch data, i4, q4 are first millisecond of 1 bit data
I branch data and q branch data, i5, q5 are the i circuitry number of first millisecond of 1 bit data
According to q branch data, i6, q6 are the i branch data of first millisecond of 1 bit data and q props up
Circuit-switched data, i7, q7 are i branch data and the q branch data of first millisecond of 1 bit data, i8,
Q8 is i branch data and the q branch data of first millisecond of 1 bit data, and i9, q9 are 1
The i branch data of first millisecond of bit data and q branch data, i10, q10 are 1 bit data
The i branch data of first millisecond and q branch data, i11, q11 are first of 1 bit data
The i branch data of millisecond and q branch data, i12, q12 are the i of first millisecond of 1 bit data
Branch data and q branch data, i13, q13 are the i branch data of first millisecond of 1 bit data
With q branch data, i14, q14 are the i branch data of first millisecond of 1 bit data and q props up
Circuit-switched data, i15, q15 are i branch data and the q branch data of first millisecond of 1 bit data,
I16, q16 are i branch data and the q branch data of first millisecond of 1 bit data, i17, q17
I branch data for first millisecond of 1 bit data and q branch data, i18, q18 are 1 ratio
The i branch data of first millisecond of special data and q branch data, i19, q19 are 1 bit data
The i branch data of first millisecond and q branch data, i20, q20 are first milli of 1 bit data
The i branch data of second and q branch data.
For gps satellite, Big Dipper meo, igso satellite, the corresponding one group of bit data of the first situation
For [i1, q1, i2, q2 ... i20, q20]；The corresponding one group of bit data of second situation be [i2,
Q2, i3, q3 ... i21, q21]；By that analogy, the corresponding one group of bit data of the 20th kind of situation
For [i20, q20, i21, q21 ... i39, q39].
2 kinds of situations are assumed to Big Dipper geo satellite, respectively i1, q1 is first of 1 bit data
The i branch data of millisecond and q branch data, i2, q2 are that the i of first millisecond of 1 bit data props up
Circuit-switched data and q branch data.The corresponding one group of bit data of the first situation is [i1, q1, i2, q2]；
The corresponding one group of bit data of second situation is [i2, q2, i3, q3].
S203, in an accumulation period, the n group bit data of each bit period is all multiplied by corresponding pre-
If amplitude.
In the embodiment of the present invention two, each accumulation period includes m bit period, and m can be strong according to signal
It is weak that wherein, m is greater than or equal to 1 integer setting, m when signal is weak be more than signal strong when m.
For gps satellite and Big Dipper geo satellite, all i branch data in every group of bit data and q
Branch data is all multiplied by 1；
For Big Dipper meo, igso satellite, the i branch data of first millisecond and q branch data are all taken advantage of
All it is multiplied by 1 with the i branch data of 1, second millisecond and q branch data, the i circuitry number of the 3rd millisecond
All it is multiplied by 1 according to q branch data, the i branch data of the 4th millisecond and q branch data are all multiplied by 1,
The i branch data of the 5th millisecond and q branch data are all multiplied by 1, the i branch data of the 6th millisecond and q
Branch data is all multiplied by -1, and the i branch data of the 7th millisecond and q branch data are all multiplied by 1, the 8th
The i branch data of millisecond and q branch data are all multiplied by 1, the i branch data of the 9th millisecond and q branch road
Data is all multiplied by -1, and the i branch data of the tenth millisecond and q branch data are all multiplied by -1, the 11st milli
Second i branch data and q branch data be all multiplied by i branch data and the q branch road of the 1, the 12nd millisecond
Data is all multiplied by -1, and the i branch data of the 13rd millisecond and q branch data are all multiplied by the 1, the 14th
The i branch data of millisecond and q branch data are all multiplied by -1, and the i branch data of the 15th millisecond and q prop up
Circuit-switched data is all multiplied by the i branch data of the 1, the 16th millisecond and q branch data is all multiplied by the 1, the 17th
The i branch data of millisecond and q branch data are all multiplied by -1, and the i branch data of the 18th millisecond and q prop up
Circuit-switched data is all multiplied by -1, and the i branch data of nineteen millisecond and q branch data are all multiplied by the -1, the 20th
The i branch data of individual millisecond and q branch data are all multiplied by 1.For example [i1, q1, i2, q2 ... i20,
Q20] * [1,1,1,1,1, -1,1,1, -1, -1,1, -1,1, -1,1,1, -1, -1, -1,
1】；[i2, q2, i3, q3 ... i21, q21] * [1,1,1,1,1, -1,1,1, -1, -1,
1, -1,1, -1,1,1, -1, -1, -1,1].
S204, the n of each bit period after corresponding default amplitude in an accumulation period, will be multiplied by
Group bit data all carries out the fft computing of frequency domain, and every group of bit data correspondence of each bit period obtains one
Group real outcomes.
The points of fft need to be more than 20 it is contemplated that the balance of the cost of hardware and degree of accuracy, the embodiment of the present invention
, naturally it is also possible to select the fft of other points, points are higher, and amount of calculation is bigger for two fft selecting at 32 points,
Hardware cost is higher, but corresponding precision is higher, and the Doppler frequency difference calculating is more accurate.
After fft computing, for be 1 bit data with i1, q1 first taking 32 points of fft as a example
The i branch data of individual millisecond and the situation of q branch data, first bit period one group of bit data [i1,
Q1, i2, q2 ... i20, q20], the result note of one group of 32 value after fft computing, can be obtained
For an+jbn (wherein n is 1 32), this complex result is sought (a^2+b^2) ^1/2, can obtain
One group of 32 real outcomes.In the same manner, second bit period one group of bit data [i21, q21, i22,
Q22 ... i40, q40] one group of 32 real outcomes, by that analogy, each accumulation period can also be obtained
Including m bit period, then can obtain 32 real outcomes of m group.
S205, for each with the i branch data that wherein a millisecond reads in a bit period and
The i branch data as first millisecond of 1 bit data for the q branch data and the situation of q branch data,
Respectively by corresponding for every group of bit data of all bit periods in an accumulation period one group of real outcomes phase
Plus.
For example, as s204 illustrates, for the i of first millisecond being 1 bit data with i1, q1
Branch data and the situation of q branch data, 32 real outcomes of m group are added, obtain one group 32
Value.By that analogy, altogether can obtain n kind and assume corresponding 32 values of n group,
S206, compare the size of n group real outcomes, obtain maximum, by corresponding for maximum real outcomes
Group first millisecond position as bit period original position, thus realizing satellite-signal bit synchronization.
In the embodiment of the present invention two, compare the size of n group real outcomes, obtain maximum and specifically include:
Then maximum in n group real outcomes is compared by maximizing in every group of real outcomes,
Obtain maximum, or,
Relatively in n group real outcomes, the size of all real outcomes, obtains maximum real outcomes.
In the embodiment of the present invention two, after s206, methods described can also include:
Using this maximum the position of its place group as Doppler frequency difference value.
Taking 32 points of fft results as a example, because 1ms cycle corresponding frequency is 1000hz, 32 points of fft
Difference on the frequency between each result corresponding is 1000/32=31.25hz, therefore according to this maximum in this set
Position can calculate Doppler frequency difference.
The corresponding frequency differences of 32 values are respectively 0,1x31.25,2x31.25 ... 15x31.25, -1x31.25,
-2x31.25,…-16x31.25.Finally this Doppler frequency difference is fed back to track loop.
In the embodiment of the present invention two, the sequencing of s204 and s205 can also be exchanged, particularly as follows:
S204 is: in an accumulation period, for each with wherein a millisecond in a bit period
The i branch data that reads and q branch data are as the i circuitry number of first millisecond of 1 bit data
According to the situation with q branch data, respectively will be corresponding pre- for being multiplied by of all bit periods in an accumulation period
If amplitude after the value of the corresponding millisecond of every group of bit data added up, obtain one group of accumulated value.
S205 is: for each with the i branch data that wherein a millisecond reads in a bit period
Feelings with the i branch data as first millisecond of 1 bit data for the q branch data and q branch data
Condition, carries out the fft computing of frequency domain to this group accumulated value, obtains one group of real outcomes.
Embodiment three:
Refer to Fig. 3, the bit synchronous device of satellite-signal that the embodiment of the present invention three provides includes:
Assume module 11, for the bit period according to gps system and Beidou satellite navigation system it is assumed that n
The situation of kind, n is equal to the millisecond quantity of a bit period, and each situation corresponds to a bit period respectively
The interior i branch data that wherein a millisecond reads and q branch data are as first of 1 bit data
The i branch data of millisecond and the situation of q branch data；
Fft computing module 12, for respectively the n group sequence corresponding to n kind situation being carried out fft computing,
Obtain the corresponding result of n group；
Comparison module 13, for comparing the size of n group result, obtains maximum, by corresponding for maximum knot
Fruit group first millisecond position as bit period original position, thus realizing satellite-signal bit synchronization.
In the embodiment of the present invention three, described hypothesis module specifically may include that
Read module, reads i branch data and q branch data for every millisecond from Satellite Tracking passage；
Shift module, for the i branch data that reads every millisecond in a bit period and q branch road
Data respectively as the i branch data of first millisecond of 1 bit data and q branch data, in conjunction with
I branch data and q branch data that in one bit period every millisecond reads, thus by adjacent dibit
Data displacement in cycle is combined into n group bit data, every group of bit data include n i branch data with
N q branch data, wherein, n is equal to the millisecond quantity of a bit period；
Take advantage of module, for, in an accumulation period, the n group bit data of each bit period being all multiplied by
Corresponding default amplitude.
In the embodiment of the present invention three, described fft computing module specifically may include that
First fft computing submodule, in an accumulation period, being multiplied by after corresponding default amplitude
The n group bit data of each bit period all carry out the fft computing of frequency domain, every group of each bit period
Bit data correspondence obtains one group of real outcomes；
Summation module, for being propped up with the wherein one millisecond i reading in a bit period for each
Circuit-switched data and q branch data are as the i branch data of first millisecond of 1 bit data and q circuitry number
According to situation, respectively by corresponding one group of every group of bit data of all bit periods in an accumulation period
Real outcomes are added.
In the embodiment of the present invention three, described fft computing module specifically can also include:
Accumulator module, in an accumulation period, for each with a bit period wherein
I branch data that one millisecond reads and q branch data are as the i of first millisecond of 1 bit data
Branch data and the situation of q branch data, being multiplied by all bit periods in an accumulation period respectively
The value of the corresponding millisecond of every group of bit data after corresponding default amplitude is added up, and obtains one group of accumulated value；
2nd fft computing submodule, for being read with wherein a millisecond in a bit period for each
The i branch data got and q branch data are as the i branch data of first millisecond of 1 bit data
With the situation of q branch data, this group accumulated value is carried out with the fft computing of frequency domain, obtain one group of real outcomes.
In the embodiment of the present invention three, described comparison module 13 specifically for: compare n group real outcomes
Size, obtains maximum, using the position of first millisecond of corresponding for maximum real outcomes group as bit
The original position in cycle.
The embodiment of the present invention additionally provides a kind of navigation neceiver, and described navigation neceiver includes the present invention to be implemented
The bit synchronous device of satellite-signal that example three provides.
In embodiments of the present invention, due to the bit period according to gps system and Beidou satellite navigation system,
Assume n kind situation, each situation corresponds to the wherein one millisecond i reading in a bit period respectively
Branch data and q branch data are as the i branch data of first millisecond of 1 bit data and q branch road
N group sequence corresponding to n kind situation is carried out fft computing, obtains n group right by the situation of data respectively
The result answered；Compare the size of n group result, obtain maximum, by the first of corresponding for maximum result group
The position of individual millisecond is as the original position of bit period, thus realizing satellite-signal bit synchronization.Thus while
Beidou satellite navigation system is different with the cycle of the data bit signal of gps system, but the bit synchronization side of the present invention
Method still can compatible Beidou satellite navigation system and gps system, realize satellite-signal bit synchronization.
Further, since being respectively multiplied by of all bit periods in an accumulation period is corresponded to default amplitude
The value of the corresponding millisecond of every group of bit data afterwards is added up, and obtains one group of accumulated value；Or, respectively will
The corresponding one group of real outcomes of every group of bit data of all bit periods in one accumulation period are added.Cause
Even if this is when signal is weaker, also can bit synchronization success well.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is
Related hardware can be instructed complete by program, described program can be stored in a computer-readable
Take in storage medium, described storage medium, such as rom/ram, disk, CD etc..
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any modification, equivalent and improvement made within bright spirit and principle etc., should be included in the present invention
Protection domain within.
Claims (10)
1. a kind of bit synchronous method of satellite-signal is it is characterised in that methods described includes:
, it is assumed that n kind situation, n is equal to one for bit period according to gps system and Beidou satellite navigation system
The millisecond quantity of individual bit period, each situation corresponds to wherein one millisecond reading in a bit period respectively
The i branch data got and q branch data are as the i branch data of first millisecond of 1 bit data
Situation with q branch data；
Respectively the n group sequence corresponding to n kind situation is carried out fft computing, obtain the corresponding result of n group；
Compare the size of n group result, obtain maximum, by first millisecond of corresponding for maximum result group
Position as bit period original position, thus realizing satellite-signal bit synchronization.
2. the method for claim 1 is it is characterised in that described defend according to gps system and the Big Dipper
It is assumed that n kind situation, n is equal to the millisecond quantity of a bit period, often for the bit period of star navigation system
A kind of situation corresponds to the i branch data that wherein a millisecond reads and q branch road in a bit period respectively
Data is specifically wrapped as the i branch data of first millisecond of 1 bit data and the situation of q branch data
Include:
Every millisecond is read i branch data and q branch data from Satellite Tracking passage；
The i branch data that reads every millisecond in a bit period and q branch data are as 1
The i branch data of first millisecond of individual bit data and q branch data, in conjunction with the following bit cycle
I branch data and q branch data that every millisecond reads, thus the data in the adjacent dibit cycle is moved
Hyte synthesizes n group bit data, and every group of bit data includes n i branch data and n q circuitry number
According to wherein, n is equal to the millisecond quantity of a bit period；
In an accumulation period, the n group bit data of each bit period is all multiplied by corresponding default width
Value.
3. method as claimed in claim 2 it is characterised in that described respectively by corresponding to n kind situation
N group sequence carries out fft computing, obtains the corresponding result of n group and specifically includes:
In an accumulation period, by the n group bit of each bit period being multiplied by after corresponding default amplitude
Data all carries out the fft computing of frequency domain, and every group of bit data correspondence of each bit period obtains one group of real number
Result；
For each with the i branch data that wherein a millisecond reads in a bit period and q branch road
The i branch data as first millisecond of 1 bit data for the data and the situation of q branch data, respectively
Corresponding for every group of bit data of all bit periods in one accumulation period one group of real outcomes are added.
4. method as claimed in claim 2 it is characterised in that described respectively by corresponding to n kind situation
N group sequence carries out fft computing, obtains the corresponding result of n group and specifically includes:
In an accumulation period, each is read with wherein a millisecond in a bit period
I branch data and q branch data prop up as the i branch data of first millisecond of 1 bit data and q
Being multiplied by of all bit periods in one accumulation period is corresponded to default amplitude by the situation of circuit-switched data respectively
The value of the corresponding millisecond of every group of bit data afterwards is added up, and obtains one group of accumulated value；
For each with the i branch data that wherein a millisecond reads in a bit period and q branch road
The i branch data as first millisecond of 1 bit data for the data and the situation of q branch data, to this
Group accumulated value carries out the fft computing of frequency domain, obtains one group of real outcomes.
5. the method as described in claim 3 or 4 is it is characterised in that the described size comparing n group result,
Obtain maximum, the position of first millisecond of corresponding for maximum result group is initial as bit period
Position particularly as follows:
The size of relatively n group real outcomes, acquisition maximum, by the of corresponding for maximum real outcomes group
The position of one millisecond is as the original position of bit period.
6. a kind of bit synchronous device of satellite-signal is it is characterised in that described device includes:
Assume module, for the bit period according to gps system and Beidou satellite navigation system it is assumed that n kind
Situation, n is equal to the millisecond quantity of a bit period, and each situation corresponds in a bit period respectively
The i branch data that wherein a millisecond reads and q branch data as 1 bit data first milli
The i branch data of second and the situation of q branch data；
Fft computing module, for respectively the n group sequence corresponding to n kind situation being carried out fft computing, obtains
To the corresponding result of n group；
Comparison module, for comparing the size of n group result, obtains maximum, by corresponding for maximum result
Group first millisecond position as bit period original position, thus realizing satellite-signal bit synchronization.
7. device as claimed in claim 6 is it is characterised in that described hypothesis module specifically includes:
Read module, reads i branch data and q branch data for every millisecond from Satellite Tracking passage；
Shift module, for the i branch data that reads every millisecond in a bit period and q branch road
Data respectively as the i branch data of first millisecond of 1 bit data and q branch data, in conjunction with
I branch data and q branch data that in one bit period every millisecond reads, thus by adjacent dibit
Data displacement in cycle is combined into n group bit data, every group of bit data include n i branch data with
N q branch data, wherein, n is equal to the millisecond quantity of a bit period；
Take advantage of module, for, in an accumulation period, the n group bit data of each bit period being all multiplied by
Corresponding default amplitude.
8. device as claimed in claim 7 is it is characterised in that described fft computing module specifically includes:
First fft computing submodule, in an accumulation period, being multiplied by after corresponding default amplitude
The n group bit data of each bit period all carry out the fft computing of frequency domain, every group of each bit period
Bit data correspondence obtains one group of real outcomes；
Summation module, for being propped up with the wherein one millisecond i reading in a bit period for each
Circuit-switched data and q branch data are as the i branch data of first millisecond of 1 bit data and q circuitry number
According to situation, respectively by corresponding one group of every group of bit data of all bit periods in an accumulation period
Real outcomes are added.
9. device as claimed in claim 7 is it is characterised in that described fft computing module specifically includes:
Accumulator module, in an accumulation period, for each with a bit period wherein
I branch data that one millisecond reads and q branch data are as the i of first millisecond of 1 bit data
Branch data and the situation of q branch data, being multiplied by all bit periods in an accumulation period respectively
The value of the corresponding millisecond of every group of bit data after corresponding default amplitude is added up, and obtains one group of accumulated value；
2nd fft computing submodule, for being read with wherein a millisecond in a bit period for each
The i branch data got and q branch data are as the i branch data of first millisecond of 1 bit data
With the situation of q branch data, this group accumulated value is carried out with the fft computing of frequency domain, obtain one group of real outcomes.
10. a kind of navigation neceiver is it is characterised in that described navigation neceiver includes claim 6 to 9
The bit synchronous device of satellite-signal described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510991156.5A CN106338751A (en) | 2015-12-25 | 2015-12-25 | Satellite signal bit synchronization method and device, and navigation receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510991156.5A CN106338751A (en) | 2015-12-25 | 2015-12-25 | Satellite signal bit synchronization method and device, and navigation receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106338751A true CN106338751A (en) | 2017-01-18 |
Family
ID=57826452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510991156.5A Pending CN106338751A (en) | 2015-12-25 | 2015-12-25 | Satellite signal bit synchronization method and device, and navigation receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106338751A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064965A (en) * | 2017-05-03 | 2017-08-18 | 电子科技大学 | A kind of GPS synchronous method |
| CN108051829A (en) * | 2017-11-06 | 2018-05-18 | 深圳开阳电子股份有限公司 | A kind of satellite navigation receiver and its navigation bit synchronization method and apparatus |
| CN111487655A (en) * | 2020-05-15 | 2020-08-04 | 无锡奇芯科技有限公司 | GNSS signal position synchronization method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109802A (en) * | 2006-07-17 | 2008-01-23 | 联发科技股份有限公司 | Method and apparatus for determining boundaries of information elements |
| US20090295631A1 (en) * | 2008-05-29 | 2009-12-03 | Qualcomm Incorporated | Apparatus and method for cross-correlation spur mitigation |
| JP2010002372A (en) * | 2008-06-23 | 2010-01-07 | Furuno Electric Co Ltd | Multi-frequency gnss receiving device |
| CN103091686A (en) * | 2011-10-31 | 2013-05-08 | 北京大学 | Bit synchronization method and device of compatible Beidou satellite navigation system and global position system (GPS) |
| CN104237912A (en) * | 2013-06-14 | 2014-12-24 | 凹凸电子（武汉）有限公司 | Navigation bit synchronization method and method for detecting navigation bit synchronization |
| CN105093241A (en) * | 2014-05-15 | 2015-11-25 | 北京大学 | Bit synchronization method and apparatus |
-
2015
- 2015-12-25 CN CN201510991156.5A patent/CN106338751A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109802A (en) * | 2006-07-17 | 2008-01-23 | 联发科技股份有限公司 | Method and apparatus for determining boundaries of information elements |
| US20090295631A1 (en) * | 2008-05-29 | 2009-12-03 | Qualcomm Incorporated | Apparatus and method for cross-correlation spur mitigation |
| JP2010002372A (en) * | 2008-06-23 | 2010-01-07 | Furuno Electric Co Ltd | Multi-frequency gnss receiving device |
| CN103091686A (en) * | 2011-10-31 | 2013-05-08 | 北京大学 | Bit synchronization method and device of compatible Beidou satellite navigation system and global position system (GPS) |
| CN104237912A (en) * | 2013-06-14 | 2014-12-24 | 凹凸电子（武汉）有限公司 | Navigation bit synchronization method and method for detecting navigation bit synchronization |
| CN105093241A (en) * | 2014-05-15 | 2015-11-25 | 北京大学 | Bit synchronization method and apparatus |
Non-Patent Citations (2)
| Title |
|---|
| MIKKO KOKKONEN 等: ""A New Bit Synchronization Method for a GPS Receiver"", 《POSITION LOCATION AND NAVIGATION SYMPOSIUM》 * |
| 王建辉 等: ""基于FFT和电文估计的GNSS弱信号载波跟踪方法"", 《国防科技大学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064965A (en) * | 2017-05-03 | 2017-08-18 | 电子科技大学 | A kind of GPS synchronous method |
| CN107064965B (en) * | 2017-05-03 | 2019-04-12 | 电子科技大学 | A kind of GPS synchronous method |
| CN108051829A (en) * | 2017-11-06 | 2018-05-18 | 深圳开阳电子股份有限公司 | A kind of satellite navigation receiver and its navigation bit synchronization method and apparatus |
| CN111487655A (en) * | 2020-05-15 | 2020-08-04 | 无锡奇芯科技有限公司 | GNSS signal position synchronization method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5241561A (en) | Radio receiver | |
| CN101499842B (en) | Code generator, correlator and correlation method of GNSS receiver | |
| CA2653326C (en) | Altboc receiver | |
| TWI391696B (en) | Method, article, and subscriber station for multipath detection of received sps signal | |
| EP0591835A1 (en) | Differential phase measurement through antenna multiplexing | |
| JP2620219B2 (en) | Digital nabster receiver | |
| US8311164B2 (en) | Correlator for tracking satellite signal | |
| CN109782314B (en) | GNSS satellite signal receiving hierarchical processing simulation experiment platform | |
| CN106338751A (en) | Satellite signal bit synchronization method and device, and navigation receiver | |
| CN105917622A (en) | Method and receiver for receiving composite signal | |
| CN101952735B (en) | Multiphase code generator and GNSS receiver | |
| US6738713B2 (en) | Positioning apparatus and method | |
| CN109313271A (en) | One kind is for making digital signal and the relevant method, apparatus of associated code, computer program, chipset or data structure | |
| CN106980124A (en) | A kind of tracking and device of TH/DS CDMA navigation signals | |
| CN106338752B (en) | A kind of method, apparatus and navigation neceiver of satellite-signal bit synchronization | |
| CN106526635B (en) | A kind of filtering method of GNSS signal carrier track and navigation calculation tight integration | |
| US8295411B2 (en) | Method and system for maintaining integrity of a binary offset carrier signal | |
| EP2413160A1 (en) | Method for resolving the binary offset carrier (BOC) signals tracking ambiguity in a double estimator receiver | |
| Corbell | Design and validation of an accurate GPS signal and receiver truth model for comparing advanced receiver processing techniques | |
| CN113253316A (en) | Universal navigation signal capturing and processing method | |
| CN112731475A (en) | GNSS occultation double-branch signal open-loop tracking method | |
| CN106154294B (en) | A kind of carrier tracking circuit and carrier wave tracing method | |
| KR101863234B1 (en) | Tracking method for boc signals with autocorrelation function having two side peaks | |
| CN104422939B (en) | Method and apparatus for being associated with the signal received from navigational satellite system | |
| GB2376363A (en) | Positioning Apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 518000 Guangdong, Nanshan District high tech Zone, Shenzhen Software Park Phase 1, building 4, room, building 4, 406-421 Applicant after: Shenzhen Shenyang electronic Limited by Share Ltd Address before: 518000 Guangdong, Nanshan District high tech Zone, Shenzhen Software Park Phase 1, building 4, room, building 4, 406-421 Applicant before: Aike Chuangxin Microelectronic Co., Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170118 |