CN104570015B - A kind of frequency pulling method - Google Patents
A kind of frequency pulling method Download PDFInfo
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- CN104570015B CN104570015B CN201310518423.8A CN201310518423A CN104570015B CN 104570015 B CN104570015 B CN 104570015B CN 201310518423 A CN201310518423 A CN 201310518423A CN 104570015 B CN104570015 B CN 104570015B
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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
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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)
Abstract
The present invention is applied to the communications field there is provided a kind of frequency pulling method, and this method includes：By setting the noise bandwidth and coherent integration time of FLL to carry out frequency pulling to capture signal to obtain frequency discrimination result, if the frequency discrimination result of continuous n times is less than predetermined threshold value in preset time period, terminate frequency pulling；Otherwise losing lock；Wherein described N is the integer more than or equal to 1.Pass through the parameter setting to noise bandwidth and coherent integration time in frequency pulling, frequency is rapidly drawn in the stable scope of a band frequency, further accurately drawn again, significantly shorten the time of frequency pulling, improve the accuracy of frequency pulling, and the success rate in bit synchronization stage below, the time positioned first can be reduced in situation about positioning first, positioning states are rapidly introduced into.
Description
Technical field
The invention belongs to the communications field, more particularly to a kind of frequency pulling method.
Background technology
For the general receiver of global positioning system (G1oba1Positioning System, GPS), satellite letter
Number capture, tracking, demodulation be location navigation basis.Wherein capture is the two-dimensional search to code phase and carrier frequency, can
Obtain the rough estimate value of signal Doppler frequency shift；Tracking includes three phases and is followed successively by：After frequency pulling, bit synchronization and synchronization
Tracking.
Frequency pulling is the signal Doppler frequency shift rough estimate value obtained by signal capture, and one is entered as much as possible
Fine Doppler-frequency estimation value is walked, the tracking to signal is deployed subsequently into the bit synchronization stage.Frequency generally after capture is not
Degree of certainty just corresponds to the linear working range of FLL frequency discriminator, if frequency deviation falls near the border in linear frequency discrimination region, by
The influence of noise, tracking frequency may cross linear frequency discrimination region, finally be locked in a wrong frequency, cause false-lock to show
As, it will the lock in time of signal is greatly increased, or even synchronously can not give up satellite, if there is the meeting before positioning first
Cause primary positioning time elongated.Frequency pulling mainly using FLL traction, current its false-lock phenomenon of existing mode compared with
To be serious, especially in the case of weak signal, cause satellite synchronization overlong time or even sometimes can not be synchronous.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of frequency pulling method, to solve during frequency pulling in the prior art
Between take it is long, the problem of efficiently can not carry out bit synchronization.
The embodiments of the invention provide a kind of frequency pulling method, methods described comprises the steps：
By setting the noise bandwidth and coherent integration time of FLL to carry out frequency pulling to capture signal to be reflected
Frequency result, if the frequency discrimination result of continuous n times is less than predetermined threshold value in preset time period, terminates frequency pulling；Otherwise losing lock；
Wherein described N is the integer more than or equal to 1.
In embodiments of the present invention, the technical scheme that provides of the present invention in frequency pulling by noise bandwidth and relevant
The parameter setting of the time of integration, frequency is rapidly drawn in the stable scope of a band frequency, then carry out further accurate
Traction, significantly shortens the time of frequency pulling, improve the accuracy of frequency pulling, and the bit synchronization stage below
Success rate, the time positioned first can be reduced in situation about positioning first, positioning states are rapidly introduced into.
Brief description of the drawings
Fig. 1 is a kind of flow chart for frequency pulling method that the present invention is provided；
Fig. 2 is the flow chart for another frequency pulling method that the present invention is provided.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
A kind of frequency pulling method that the present invention is provided, this method implementation process is as shown in figure 1, details are as follows：
Step S11, the noise bandwidth by setting FLL and coherent integration time carry out frequency pulling to capture signal
To obtain frequency discrimination result.
If step S12, in preset time period continuous n times frequency discrimination result be less than predetermined threshold value, terminate frequency pulling；
Otherwise losing lock；Wherein described N is the integer more than or equal to 1.
As the preferred embodiments of the present invention, in actual frequency traction, satellite-signal is weaker, in order to quickly will
Frequency pulling, while can correctly be synchronized after ensureing frequency pulling, will be set in stable frequency range to FLL
Put different noise bandwidth and coherent integration time, carry out frequency pulling, this method implementation process stage by stage as shown in Fig. 2 tool
Body method is as follows：
Step S21, by setting the noise bandwidth of the FLL to be that the first bandwidth is interval, the coherent integration time is
First time period carries out first stage frequency pulling to obtain frequency discrimination result to capture signal.
Specifically, such as automatic navigator, the Doppler frequency range of vehicle mounted guidance satellite is ± 5kHz, general to set paving
The search rate step-length of goods is 500Hz, and first stage frequency pulling is using the FLL that grass is roomy, coherent integration time is short
Carry out frequency pulling so that can find carrier frequency in large-scale bandwidth in the first stage frequency pulling, so as to
Can be quickly by frequency pulling to the stable scope of a band frequency so that be easier convergence in the frequency pulling of next stage.
For example can be set the first bandwidth interval be 40Hz, first time period be 1ms the phase FLL of single order four as the first stage
Frequency pulling.
Step S22, judge in preset time period whether the frequency discrimination result of continuous n times is less than predetermined threshold value one, if reaching N
It is secondary, then terminate first stage frequency pulling；If it is not, then losing lock.
Specifically, it is 20Hz to set the threshold value one, and the N values are 10, and the preset time period is 50ms.As preferred
Embodiment, corresponding counter is set according to the predetermined threshold value, if current frequency discrimination result is less than predetermined threshold value, the correspondence
Counter add 1；Otherwise the corresponding counter clear 0.For example, when frequency discrimination result is less than threshold value for the moment, counter one Jia 1,
When frequency discrimination result is more than or equal to threshold value a period of time, counter one clear 0.
Step S23, by setting the noise bandwidth of the FLL to be that the second bandwidth is interval, the coherent integration time is
Second time period carries out second stage frequency pulling to obtain frequency discrimination result to capture signal.
Specifically, the second stage frequency pulling reduces noise bandwidth relative to the first stage frequency pulling, adopted
Frequency pulling is carried out with the FLL of coherent integration time length, signal to noise ratio is improved, frequency pulling is rapidly traced into one and contained
In the few frequency of noise, the time of frequency pulling is further reduced.The first bandwidth interval is more than second bandwidth
Interval, first time period is less than the second time period, and it is 30Hz, first time period that the second bandwidth interval, which for example can be set,
Second stage frequency pulling is used as the 3ms phase FLL of single order four.
Step S24, judge in preset time period whether the frequency discrimination result of continuous n times is less than predetermined threshold value two, if reaching N
It is secondary, then ending segment frequency pulling；If it is not, then performing step S25.
Specifically, it is 10Hz to set the threshold value two, and the N values are 10, and the preset time period is 100ms.As excellent
Embodiment is selected, corresponding counter is set according to the predetermined threshold value, it is described right if current frequency discrimination result is less than predetermined threshold value
The counter answered plus 1；Otherwise the corresponding counter clear 0.For example, when frequency discrimination result is less than threshold value two, counter two adds
1, when frequency discrimination result is more than or equal to threshold value two, counter one clear 0.
Step S25, judge in the preset time period whether the frequency discrimination result of continuous n times is less than predetermined threshold value three, if so,
Then terminate second stage frequency pulling, into phase III frequency pulling；Otherwise losing lock.
Specifically, the predetermined threshold value two is less than the predetermined threshold value three, the predetermined threshold value three and is less than the default threshold
Value one, it is 15Hz to set the threshold value three, and the N values are 10, and the preset time period is 300ms.As the presently preferred embodiments, root
Corresponding counter is set according to the predetermined threshold value, if current frequency discrimination result is less than predetermined threshold value, the corresponding counter
Plus 1；Otherwise the corresponding counter clear 0.For example, when frequency discrimination result is less than threshold value three, counter three Jia 1, when frequency discrimination knot
When fruit is more than or equal to threshold value three, counter three clear 0.
Step S26, the noise bandwidth for setting the FLL are that the second bandwidth is interval, the coherent integration time is second
Period simultaneously sets non-coherent integration times to carry out phase III frequency pulling to capture signal to obtain frequency discrimination result for N '.
Specifically, the phase III frequency pulling is directed to weaker satellite-signal, relative to the second stage frequency
Traction adds non-coherent integration process so that the signal to noise ratio of signal can be further improved.It for example can be set described the
Two bandwidth intervals are 30Hz, first time period is 3ms and non-coherent integration times N ' values are 4.
Step S27, judge in preset time period whether the frequency discrimination result of continuous n times is less than predetermined threshold value two, if reaching N
It is secondary, then terminate frequency pulling；Otherwise losing lock.
The technical scheme that the present invention is provided is set in frequency pulling by the parameter to noise bandwidth and coherent integration time
Put, frequency is rapidly drawn in the stable scope of a band frequency, then further accurately drawn, significantly shortened
The time of frequency pulling, the accuracy of frequency pulling, and the success rate in bit synchronization stage below are improved, positioned first
Situation can reduce the time positioned first, be rapidly introduced into positioning states.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of frequency pulling method, it is characterised in that methods described comprises the following steps：
By setting the frequency of the different noise bandwidths and different coherent integration times of FLL to the progress of capture signal stage by stage
Traction is to obtain frequency discrimination result, if the frequency discrimination result of continuous n times is less than the pre- of the stage in the preset time period in a certain stage
If threshold value, then terminate the frequency pulling in the stage；Otherwise losing lock；
Wherein described N is the integer more than 1；
Methods described specifically includes following steps：
By setting the noise bandwidth of the FLL to be that the first bandwidth is interval, the coherent integration time is first time period pair
Capture signal carry out first stage frequency pulling to obtain frequency discrimination result, if in preset time period continuous n times frequency discrimination result
Less than predetermined threshold value one, then terminate first stage frequency pulling；Otherwise losing lock；
By setting the noise bandwidth of the FLL to be that the second bandwidth is interval, the coherent integration time is second time period pair
Capture signal carry out second stage frequency pulling to obtain frequency discrimination result, if in preset time period continuous n times frequency discrimination result
Less than predetermined threshold value two, then terminate frequency pulling；Otherwise losing lock.
2. the method as described in claim 1, it is characterised in that before the losing lock step, also comprise the following steps：
In second stage frequency pulling, if the frequency discrimination result for not having continuous n times in preset time period is less than predetermined threshold value two,
And the frequency discrimination result of continuous n times is less than predetermined threshold value three in the preset time period, then terminates second stage frequency pulling, enter
Enter phase III frequency pulling；Otherwise losing lock.
3. method as claimed in claim 2, it is characterised in that the phase III frequency pulling comprises the following steps：
The noise bandwidth for setting the FLL is that the second bandwidth is interval, the coherent integration time is second time period and set
Put non-coherent integration times and phase III frequency pulling is carried out to obtain frequency discrimination result to capture signal for N ', if in preset time
The frequency discrimination result of continuous n times is less than predetermined threshold value two in section, then terminates frequency pulling；Otherwise losing lock.
4. the method as described in claim 1 or 3, it is characterised in that the first bandwidth interval is more than the second bandwidth area
Between.
5. the method as described in claim 1 or 3, it is characterised in that the first time period is less than the second time period.
6. method as claimed in claim 2 or claim 3, it is characterised in that the predetermined threshold value two is less than the predetermined threshold value three, institute
Predetermined threshold value three is stated less than the predetermined threshold value one.
7. the method as described in any claim in claims 1 to 3, it is characterised in that judge described less than predetermined threshold value
Frequency discrimination result reach that the method for n times comprises the following steps：
Corresponding counter is set according to the predetermined threshold value, it is described corresponding if current frequency discrimination result is less than predetermined threshold value
Counter adds 1；Otherwise the corresponding counter clear 0.
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| CN104570015B true CN104570015B (en) | 2017-07-25 |
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| CN105929418B (en) * | 2016-03-07 | 2018-08-31 | 广州海格通信集团股份有限公司 | A kind of high dynamic frequency discrimination method and frequency locking ring for satellite-signal tracking |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404825B1 (en) * | 1998-03-26 | 2002-06-11 | Analog Devices, Inc. | Digital radio receiver lock detector |
| CN1642156A (en) * | 2004-01-14 | 2005-07-20 | 北京大学 | Carrier wave catching device and method for large dynamic signal under condition of large frequency deviation |
| CN101435866A (en) * | 2008-11-26 | 2009-05-20 | 苏州莱迪斯特电子有限公司 | Carrier wave tracking system and method of GPS coarse / capturing code signal |
| CN101776752A (en) * | 2010-01-29 | 2010-07-14 | 中国科学院空间科学与应用研究中心 | Precise tracking and measuring method of high dynamic signal of air fleet link |
-
2013
- 2013-10-28 CN CN201310518423.8A patent/CN104570015B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404825B1 (en) * | 1998-03-26 | 2002-06-11 | Analog Devices, Inc. | Digital radio receiver lock detector |
| CN1642156A (en) * | 2004-01-14 | 2005-07-20 | 北京大学 | Carrier wave catching device and method for large dynamic signal under condition of large frequency deviation |
| CN101435866A (en) * | 2008-11-26 | 2009-05-20 | 苏州莱迪斯特电子有限公司 | Carrier wave tracking system and method of GPS coarse / capturing code signal |
| CN101776752A (en) * | 2010-01-29 | 2010-07-14 | 中国科学院空间科学与应用研究中心 | Precise tracking and measuring method of high dynamic signal of air fleet link |
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Denomination of invention: Frequency pulling method Effective date of registration: 20190621 Granted publication date: 20170725 Pledgee: Bank of China, Limited by Share Ltd, Guangzhou, Panyu branch Pledgor: Anyka (Guangzhou) Microelectronics Technology Co., Ltd. Registration number: 2019440000233 |
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Date of cancellation: 20200907 Granted publication date: 20170725 Pledgee: Bank of China Limited by Share Ltd. Guangzhou Panyu branch Pledgor: ANYKA (GUANGZHOU) MICROELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: 2019440000233 |
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Address after: 3 / F, C1 area, innovation building, 182 science Avenue, Science City, Guangzhou, Guangdong 510663 Patentee after: Guangzhou Ankai Microelectronics Co.,Ltd. Address before: 3 / F, C1 area, innovation building, 182 science Avenue, Science City, Guangzhou, Guangdong 510663 Patentee before: ANYKA (GUANGZHOU) MICROELECTRONICS TECHNOLOGY Co.,Ltd. |
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Address after: 510555 No. 107 Bowen Road, Huangpu District, Guangzhou, Guangdong Patentee after: Guangzhou Ankai Microelectronics Co., Ltd Address before: 3 / F, C1 area, innovation building, 182 science Avenue, Science City, Guangzhou, Guangdong 510663 Patentee before: Guangzhou Ankai Microelectronics Co., Ltd |
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