CN102411148A - Method for rapidly capturing navigation satellite signal and apparatus thereof - Google Patents
Method for rapidly capturing navigation satellite signal and apparatus thereof Download PDFInfo
- Publication number
- CN102411148A CN102411148A CN2011103042318A CN201110304231A CN102411148A CN 102411148 A CN102411148 A CN 102411148A CN 2011103042318 A CN2011103042318 A CN 2011103042318A CN 201110304231 A CN201110304231 A CN 201110304231A CN 102411148 A CN102411148 A CN 102411148A
- Authority
- CN
- China
- Prior art keywords
- energy
- frequency
- navigation system
- satellite navigation
- signal
- 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
Images
Landscapes
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention provides a signal capture method in a satellite navigation system and an apparatus thereof. According to the method and the apparatus of the invention, a method of determining whether phases of an energy peak value is consistent is combined with the method of comparing the energy peak value to a threshold so that whether a satellite signal is visible and a frequency and the code phase of the satellite signal can be determined. The method of comparing the detection energy peak value to the threshold in the traditional capture method is not used. Capture time can be effectively reduced. Under the condition of maintaining a degree of parallelism, a receiver used the method of the invention can be rapidly started. Otherwise, if the starting time of the receiver is required to be the same, by using the method, the degree of parallelism of an energy monitor can be reduced so as to reduce hardware realization costs. Therefore, the costs can be saved.
Description
Technical field
The present invention relates to the GPS field, more specifically, relate to the signal acquisition methods and the device thereof of GPS, comprise GPS, GLONASS, signal acquisition methods in the satellite navigation systems such as the Big Dipper and device thereof.
Background technology
Along with the expansion of the demand of Location-Based Services, the Global Navigation Satellite System (GNSS) Study on Technology with use progressively deeply.Navigation positioning receiver is the important component part of GNSS system, and navigation neceiver generally comprises antenna, radio-frequency module, baseband module and other application modules.Wherein baseband module is generally accomplished the synchronous and navigation message demodulation of signal, produces the measured value that is used to locate, and obtains the position according to measured value and navigation message, gives application module according to certain agreement, for application module provides the position, and speed or temporal information.The synchronizing process of signal comprise catch, step such as tracking, bit synchronization, frame synchronization.Wherein the trapping module of signal is first functional module of signal Synchronization.
Because the deviation of Doppler effect and clock, the carrier frequency that receiver receives is in the scope.Simultaneously, because receiver start-up time is at random, after the start, the code phase that arrives receiver also is at random, and the total number of code phase is because of the difference of navigational system difference to some extent, and concerning GPS, code phase is 0-1022, totally 1023 uncertain code phases.
Catching of GNSS signal is a kind of process of two-dimensional search, is respectively carrier doppler frequency separation and code phase interval, and different carrier waves and code phase have formed the two-dimensional search grid, and each grid is called a unit; Want lock-on signal; At first need be at local replica and the approximate consistent signal of satellite carrier frequency and code phase; When the carrier frequency of the carrier frequency of this locality and satellite-signal near and the code phase of code phase and satellite-signal when consistent; Energy detector in the trapping module will detect energy peak, and this energy peak surpasses predefined thresholding, and the unit that corresponding frequency and code phase form is called the H1 unit.On the frequency or code phase of mistake, energy detector can not detect energy peak, and corresponding cells is called the H0 unit.But because the existence of noise, there is the ultra thresholding of only setting of certain probability in energy on correct carrier frequency and the code phase, is called to leak and catches probability; Equally energy also exists certain probability above predefined thresholding on the carrier frequency of mistake and code phase, is called false-alarm probability.Because the existence of false-alarm probability; When the detected signal energy of the energy detector in the trapping module surpasses the setting thresholding; Need judge whether it is the energy peak that noise causes; Promptly eliminate the energy measuring peak value that false-alarm causes, this process is a proof procedure, can confirm whether consistent with the satellite-signal kind of the corresponding frequency of energy peak and phase place through proof procedure.
Proof procedure generally is time-consuming procedure, during general method, when energy surpasses thresholding; On this phase place and frequency, continue again to detect N time; When wherein having when surpassing thresholding M time, it is correct adjudicating this frequency and phase place, otherwise thinks the energy peak that false-alarm causes.Along with deepening continuously of continuous expansion of using and research; Present receiver need be under the condition a little less than the pickup electrode lock-on signal; This just needs to increase integral time; After increasing integral time, what the traditional serial energy detection method can become is difficult to stand too slowly, improve acquisition speed so generally need to improve degree of parallelism.Promptly need on a plurality of code phases, to detect simultaneously, when at the same time several code phases being carried out energy measuring, the false-alarm probability that occurs on each phase place is constant; But the probability that a false-alarm on all phase places, occurs will increase; When degree of parallelism further increases, it is very big that false-alarm probability will become, and causes trapping module to need constantly to get into proof procedure; And the needed time of the proof procedure of classic method is generally long, thus make that capture time becomes long and make start-up time elongated.
The present invention proposes a kind of method and device thereof of the quick checking under the parallel search condition; Be both and adopt thresholding relatively to come elimination false-alarm fast with bit comparison mutually; Overcome long problem of proving time in the parallel capture; Under the constant situation of other conditions, can quicken the acquisition procedure of satellite-signal.
Summary of the invention
Therefore, the objective of the invention is to propose signal acquisition methods and the device thereof of a kind of proving time that shortens satellite navigation system in parallel capture, this method and device can quicken the acquisition procedure of satellite-signal under the constant situation of other conditions.
The present invention also provides a kind of signal acquisition methods of satellite navigation system, judges and two steps of H1 unit checking comprising the H1 unit is preliminary, it is characterized in that: for a given frequency; On a plurality of code phases, carrying out energy peak detects; Confirm maximum energy value and corresponding phase place thereof, this energy value and predefined thresholding are compared, if this energy value is greater than thresholding; Then keep this frequency constant; Again detect carrying out N energy peak on the identical code phase,, then excess phase on this frequency or next frequency are handled as long as detected energy maximal value is unequal less than the code phase and the preceding once detected code phase of thresholding or maximum energy value correspondence; Otherwise, judge that promptly the unit that this frequency and energy maximal value correspondence code phase place form is the H1 unit.
Wherein, detected maximum energy value and thresholding method are relatively adopted in the preliminary judgement of H1 unit.
Wherein, maximum energy value and thresholding comparison and energy maximal value corresponding phase method are relatively adopted in the checking of H1 unit.
Degree of parallelism and erroneous arrest probability when wherein, said N is according to detection are confirmed.
Wherein, detection method is the mode that coherent integration combines non-coherent integration, and perhaps coherent integration combines the mode of difference integration.
Wherein, coherent integration partly adopts the relevant perhaps method of frequency domain FFT of time domain.
The present invention also provides a kind of signal capture device of satellite navigation system; Comprise antenna, radio-frequency module, energy detector and processor, wherein energy detector and processor carry out catching of satellite-signal according to signal acquisition methods described in the claim 1 to 4.
Wherein, said energy detector is by frequency mixer, carrier wave DCO, storer, selector switch, peak detctor, steering logic, sign indicating number DCO, and the sign indicating number generator, code phase heavy duty module, integration module constitutes.
Wherein, said integration module comprises RAS, coherent integration device, non-coherent integrator composition.
Description of drawings
Followingly specify technical scheme of the present invention with reference to accompanying drawing, wherein:
Fig. 1 has shown the process flow diagram of the catching method that the present invention is corresponding;
Fig. 2 has shown the signal capture structure drawing of device of realizing above-mentioned catching method among the present invention;
Fig. 3 has shown the structural drawing of corresponding energy detecting device among Fig. 2.
Embodiment
Following with reference to accompanying drawing and combine schematic embodiment to specify the characteristic and the technique effect thereof of technical scheme of the present invention, but the present invention is not limited to present embodiment.
According to a particular embodiment of the invention, acquisition procedure is described like Fig. 1: among Fig. 1, i refers to a detection number of times on the frequency, and its initial value is 0; Power
iBe energy maximal value in the i time detection, Phase
iRefer in the i time detection the phase place that the energy maximal value is corresponding; No_bins is the corresponding frequency sequence number of Doppler frequency of search; N
Doppler_binsBe the frequency number of total search, f
StepBe the frequency search step-length.
Set some Frequency points; The energy measuring that on 0-N code phase, walks abreast in the present embodiment, is supposed the phase place degree of parallelism of search all phase place numbers for required detection on certain frequency; In other embodiments, the phase place degree of parallelism also can be less than total code phase number.Detection method can adopt coherent integration to combine the method for non-coherent integration or the method that coherent integration combines the difference integration, can adopt methods such as correlation method or FFT to coherent integration, adjusts according to the power of signal detection time; Can adopt serial on the degree of parallelism, part parallel or all parallel method.
The energy measuring process can be found out the maximum phase place Phase of energy in all phase places
iEnergy value Power with maximum
i
Power
iWith predefined thresholding P
ThresholdRelatively, if Power
i＞P
Threshold, then this phase place and frequency possibly be correct phase place or frequencies, then this phase place and frequency are carried out next step checking; Be that frequency remains unchanged, again all phase places carried out energy measuring, detected peak value is greater than thresholding; Phase place also will equate with preceding once detected phase place, as long as these two conditions have one not satisfy, judges that then satellite-invisible or local carrier frequency and satellite signal carrier frequency do not wait; No_bins then; Search at next frequency,, then next satellite is searched for if all frequencies have been searched.If the checking number of times on this frequency has reached the checking times N of setting, and satisfy each detected energy maximal value greater than thresholding Power
i＞P
Threshold, the phase place corresponding with the energy maximal value is all consistent with preceding one-time detection, then judge satellite it is thus clear that, and this frequency is correct Doppler frequency, the phase place of energy peak correspondence is correct code phase.
Part is to realize device of the present invention in Fig. 2 frame of broken lines, and the present invention can realize with this device, but be not limited to device shown in Figure 2.Whole device comprises, an antenna, a radio-frequency module, an energy detector, a processor.Wherein, energy detector and processor are formed capture circuit of the present invention.Antenna is responsible for the reception of signal, and radio-frequency module is accomplished the amplification of signal, filtering and down coversion, and the analog-to-digital conversion of signal, and to the intermediate frequency data of two of energy detector outputs, sampled clock signal.
The intermediate-freuqncy signal of energy detector received RF module output, processor is through the carrier frequency of bus configuration energy detector and the initialization phase place and the code polynomial of satellite code generator; The energy detector input signal carries out mixing and associative operation; Accomplish coherent integration process, coherent integration result carries out difference or non-coherent integration again, and the difference of out of phase or non-coherent integration result compare; Phase place and maximum energy value with maximum energy value are by record; And to CPU transmission look-at-me, CPU responds interruption, reads away energy maximal value and the corresponding phase place of maximum energy value through bus.
The operation of processor control energy detecting device, and read energy maximal value and corresponding phase thereof, judge through energy and phase place whether satellite-signal is visible.
The intermediate-freuqncy signal of input is carried out mixing with the local carrier wave that produces, and produces I respectively, the data after the mixing of Q two-way, and mixing results is placed in storer 1 or 2.
This parallel correlator has adopted 40 road parallel correlators, shares the I of completion 1023 phase places and the coherent integration function of Q branch road through timesharing.Coherent integration under certain phase place of the output of parallel correlator is Ip as a result, i and Qp, i respectively with RAM2 in the integral result Ip of the last 1ms that preserves, i-1 and Qp, i-1 multiplies each other, the result is accumulated among the RAM3.Accumulative frequency reach in advance be provided with big integration is counted Ndiff the time, peak detection block is found out the maximum phase place of energy of all 1023 phase places, and preserves maximum energy value.At last,, reach maximum energy value and read, accomplish next step judgement and verification operation by CPU corresponding to the phase value of ceiling capacity.
The present invention is through the phase place judging energy peak and the occur method of unanimity whether; In conjunction with energy peak and thresholding method relatively; Judge the Doppler frequency and the code phase of the whether visible and satellite-signal of satellite-signal, rather than adopt the method that adopts detected energy peak value and thresholding comparison in traditional catching method.Can effectively reduce capture time, under the constant condition of degree of parallelism, can make and adopt reception function of the present invention to start more quickly.Otherwise if the receiver that requires is constant start-up time, the present invention can reduce the degree of parallelism of energy monitoring device, realizes cost thereby reduce hardware, thereby practices thrift cost.
Although with reference to one or more exemplary embodiments explanation the present invention, those skilled in the art can know and need not to break away from the scope of the invention and the detection method and the architecture thereof of malicious code are made various suitable changes and equivalents.In addition, can make by disclosed instruction and manyly possibly be suitable for the modification of particular condition or step and do not break away from the scope of the invention.Therefore, the object of the invention does not lie in and is limited to as being used to realize preferred forms of the present invention and disclosed specific embodiment, and disclosed device architecture and manufacturing approach thereof will comprise all embodiment that fall in the scope of the invention.
Claims (9)
1. the signal acquisition methods of a satellite navigation system is judged and two steps of H1 unit checking comprising the H1 unit is preliminary, it is characterized in that: for a given frequency; On a plurality of code phases, carrying out energy peak detects; Confirm maximum energy value and corresponding phase place thereof, this energy value and predefined thresholding are compared, if this energy value is greater than thresholding; Then keep this frequency constant; Again detect carrying out N energy peak on the identical code phase,, then excess phase on this frequency or next frequency are handled as long as detected energy maximal value is unequal less than the code phase and the preceding once detected code phase of thresholding or maximum energy value correspondence; Otherwise, judge that promptly the unit that this frequency and energy maximal value correspondence code phase place form is the H1 unit.
2. the signal acquisition methods of satellite navigation system as claimed in claim 1, wherein, detected maximum energy value and thresholding method are relatively adopted in the preliminary judgement of H1 unit.
3. the signal acquisition methods of satellite navigation system as claimed in claim 1, wherein, the method for maximum energy value and thresholding comparison and the comparison of energy maximal value corresponding phase is adopted in the checking of H Unit 1.
4. the signal acquisition methods of satellite navigation system as claimed in claim 1, wherein, the degree of parallelism of said N when detecting is definite with the erroneous arrest probability.
5. the signal acquisition methods of satellite navigation system as claimed in claim 1, wherein, energy detection method is the mode that coherent integration combines non-coherent integration, perhaps coherent integration combines the mode of difference integration.
6. the signal acquisition methods of satellite navigation system as claimed in claim 1, wherein, coherent integration partly adopts the method for the relevant or frequency domain FFT of time domain.
7. the signal capture device of a satellite navigation system comprises antenna, radio-frequency module, energy detector and processor, and wherein energy detector and processor carry out catching of satellite-signal according to signal acquisition methods described in the claim 1 to 6.
8. the signal capture device of satellite navigation system as claimed in claim 7, wherein, said energy detector is by frequency mixer, carrier wave DCO; Storer, selector switch, peak detctor, steering logic, sign indicating number DCO; The sign indicating number generator, code phase heavy duty module, integration module constitutes.
9. the signal capture device of satellite navigation system as claimed in claim 7, wherein, said energy integral module comprises that RAS, coherent integration device, non-coherent integrator or differential integrator form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103042318A CN102411148A (en) | 2011-10-10 | 2011-10-10 | Method for rapidly capturing navigation satellite signal and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103042318A CN102411148A (en) | 2011-10-10 | 2011-10-10 | Method for rapidly capturing navigation satellite signal and apparatus thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102411148A true CN102411148A (en) | 2012-04-11 |
Family
ID=45913332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103042318A Pending CN102411148A (en) | 2011-10-10 | 2011-10-10 | Method for rapidly capturing navigation satellite signal and apparatus thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102411148A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713299A (en) * | 2013-12-30 | 2014-04-09 | 北京邮电大学 | Method and device for capturing Galileo signals |
| CN104407363A (en) * | 2014-11-07 | 2015-03-11 | 泰斗微电子科技有限公司 | RDSS-based satellite signal capture method and system |
| CN105467411A (en) * | 2015-12-04 | 2016-04-06 | 航天恒星科技有限公司 | A signal capture method and apparatus |
| CN109039484A (en) * | 2018-07-24 | 2018-12-18 | 中睿通信规划设计有限公司 | A method of antenna for base station operator is identified based on energy measuring |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275844A (en) * | 1999-05-25 | 2000-12-06 | 三星电子株式会社 | Method and device for making code synchronous trapping in CDMA communication system |
| CN1859345A (en) * | 2005-04-30 | 2006-11-08 | 中国科学院上海微系统与信息技术研究所 | Quick frequency catching method based on OFDM system |
| CN101109794A (en) * | 2007-07-26 | 2008-01-23 | 北京航空航天大学 | Test platform being compatible with GNSS signal processing algorithm |
| US20110241937A1 (en) * | 2010-04-02 | 2011-10-06 | Electronics And Telecommunications Research Institute | Apparatus and method for signal acquisition in global navigation satellite system receiver |
-
2011
- 2011-10-10 CN CN2011103042318A patent/CN102411148A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275844A (en) * | 1999-05-25 | 2000-12-06 | 三星电子株式会社 | Method and device for making code synchronous trapping in CDMA communication system |
| CN1859345A (en) * | 2005-04-30 | 2006-11-08 | 中国科学院上海微系统与信息技术研究所 | Quick frequency catching method based on OFDM system |
| CN101109794A (en) * | 2007-07-26 | 2008-01-23 | 北京航空航天大学 | Test platform being compatible with GNSS signal processing algorithm |
| US20110241937A1 (en) * | 2010-04-02 | 2011-10-06 | Electronics And Telecommunications Research Institute | Apparatus and method for signal acquisition in global navigation satellite system receiver |
Non-Patent Citations (1)
| Title |
|---|
| 路卫军等: "高灵敏度GPS接收机捕获电路的优化与实现", 《北京大学学报（自然科学版）》, vol. 46, no. 6, 30 November 2010 (2010-11-30), pages 907 - 913 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713299A (en) * | 2013-12-30 | 2014-04-09 | 北京邮电大学 | Method and device for capturing Galileo signals |
| CN103713299B (en) * | 2013-12-30 | 2016-03-02 | 北京邮电大学 | A kind of method that galileo signals is caught and device |
| CN104407363A (en) * | 2014-11-07 | 2015-03-11 | 泰斗微电子科技有限公司 | RDSS-based satellite signal capture method and system |
| CN105467411A (en) * | 2015-12-04 | 2016-04-06 | 航天恒星科技有限公司 | A signal capture method and apparatus |
| CN109039484A (en) * | 2018-07-24 | 2018-12-18 | 中睿通信规划设计有限公司 | A method of antenna for base station operator is identified based on energy measuring |
| CN109039484B (en) * | 2018-07-24 | 2020-10-23 | 中睿通信规划设计有限公司 | Method for identifying operator to which base station antenna belongs based on energy detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105277955A (en) | Baseband signal processing method used for GPS satellite navigation | |
| US10042056B2 (en) | Signal processing method for ultra-fast acquisition and tracking of severely attenuated spread spectrum signals with doppler frequency and apparatus thereof | |
| CN106291613A (en) | A kind of satellite signal tracking method and device | |
| CN101458317B (en) | Gnss signal handling method and correlator implementing the same | |
| CN103091687B (en) | Big dipper receiver multi-satellite signal joint capturing method | |
| CN104833988A (en) | Acquisition system and method for high data rate direct sequence spread spectrum signals under large Doppler dynamic condition | |
| CN103954977A (en) | Method and system for sensing GNSS deception jamming | |
| JP2008111684A (en) | Satellite signal tracker and satellite signal receiver with the same | |
| CN105553506B (en) | A kind of quick capturing method and device of long code spread-spectrum signal | |
| CN102411148A (en) | Method for rapidly capturing navigation satellite signal and apparatus thereof | |
| CN104765050A (en) | Novel Beidou signal secondary acquisition algorithm | |
| CN102495416A (en) | Quick acquisition method for signals of satellite navigation system and device | |
| CN102680988B (en) | High-sensitivity navigation satellite signal nonlinear acquiring method and device | |
| US20140372496A1 (en) | Method for performing and validating navigation bit synchronization | |
| CN105301611B (en) | For the baseband portion structure for handling eight frequency points of satellite-signal point | |
| WO2012018861A1 (en) | Demodulation of data collected prior to bit edge detection | |
| EP2793051B1 (en) | Gnss signal processing method, positioning method, gnss signal processing program, positioning program, gnss signal processing device, positioning device, and mobile terminal | |
| RU2444027C2 (en) | Satellite navigation signal receiver with fast and high-sensitivity search unit | |
| JP5368213B2 (en) | GNSS receiver | |
| CN113985451A (en) | Navigation deception detection method and device based on Kalman filtering tracking loop | |
| CN111796305B (en) | High dynamic navigation satellite signal receiving method and receiver | |
| JP2013053972A (en) | Signal capture method, communication signal reception method, gnss signal reception method, signal capture program, communication signal reception program, gnss signal reception program, signal capture device, communication signal reception device, gnss signal reception device, and mobile terminal | |
| CN104360360A (en) | Efficient algorithm for acquiring and judging GPS (global positioning system) satellites | |
| O'Driscoll et al. | Software receiver strategies for the acquisition and re-acquisition of weak GPS signals | |
| JP2008209287A (en) | Satellite navigation receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120411 |