CN202975331U - High-dexterity positioning satellite signal capture system - Google Patents
High-dexterity positioning satellite signal capture system Download PDFInfo
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- CN202975331U CN202975331U CN 201220627626 CN201220627626U CN202975331U CN 202975331 U CN202975331 U CN 202975331U CN 201220627626 CN201220627626 CN 201220627626 CN 201220627626 U CN201220627626 U CN 201220627626U CN 202975331 U CN202975331 U CN 202975331U
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Abstract
The utility model discloses a high-dexterity positioning satellite signal capture system. The system includes a first numerical controlled oscillator; an output end of the first numerical controlled oscillator is connected with a half-band filter, a decimator, a memory storage device and a correlator successively. The high-dexterity positioning satellite signal capture system of the utility model comprises the correlator which is used for relevant search and can flexibly configure resources and search speed in search process, such that the utilization ratio of the resources can be increased; it is only required to replace local GOLD code generators and adjust calculation speed, so that different capture systems can have great compatibility and portability; and further, according to the capture system of the utility model, the number of sub-correlators can be increased or reduced appropriately, such that the balance between the resources and the search speed can be realized. The high-dexterity positioning satellite signal capture system of the utility model is widely used in the satellite communication field.
Description
Technical field
The utility model relates to satellite communication field, especially relates to a kind of positioning satellite signal capture systems of high flexibility ratio.
Background technology
The research of GLONASS (Global Navigation Satellite System) (GNSS) outdoor positioning technology is very general with application.Need to use capture systems during GNSS receiver processing signals.Capture systems is used for detecting whether receive effective GNSS signal from antenna end.And local pseudo-random sequence (PRN) code that produces need to be synchronizeed with the reception signal, could carry out to received signal despreading.Capture systems need to estimate local signal and the PRN code phase difference and the carrier doppler frequency displacement that receive signal simultaneously, for use in the follow-up tracking of receiver.Therefore, catching of GNSS signal is a kind of two-dimensional search process, and namely the phase place of PRN code and signal Doppler frequency deviation all will be provided by acquisition procedure.
Traditional capture systems adopts the serial acquisition of time domain and the FFT method of frequency domain to catch this two kinds of correlation techniques mostly.The biography serial acquisition principle of employing time domain is simple and be easy to realization, but capture time is very long; Adopt the FFT method of frequency domain to catch the time of catching that greatly reduces, operation can be subject to the restriction of processor calculating ability usually but it carries out FFT, and can take more resource.In addition, the algorithm that different capture systems adopt has independence and incompatibility, causes the transfer ability between different capture systems low.In case the capture systems typing is difficult to do expansion again.
To sum up, the major defect of prior art is that to take resource too much, and the transfer ability between different capture systems is low, is difficult to take into account simultaneously resource and search speed, therefore is difficult to satisfy the demand of different application scene.
The utility model content
In order to solve the problems of the technologies described above, the purpose of this utility model is to provide a kind of positioning satellite signal capture systems of high flexibility ratio, to reach the balance of resource and search speed.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of positioning satellite signal capture systems of high flexibility ratio, this system comprises the first digital controlled oscillator, and the output terminal of described the first digital controlled oscillator is connected with half-band filter, withdrawal device, mnemonic and correlator in turn.
further, described correlator comprises the address control module, the frequency deviation adjusting module, sub-correlator block, counter and GOLD code generation module, the first input end of described address control module is connected with the output terminal of described mnemonic, the second input end of described address control module is connected with the first output terminal of described counter, the output terminal of described address control module is connected with the first input end of described frequency deviation adjusting module, the second input end of described frequency deviation adjusting module is connected with the second output terminal of described counter, the output terminal of described frequency deviation adjusting module is connected with the first input end of described sub-correlator block, the second input end of described sub-correlator block is connected with the 3rd output terminal of described counter, the 3rd input end of described sub-correlator block is connected with the output terminal of described GOLD code generation module, the input end of described GOLD code generation module is connected with the 4th output terminal of described counter.
Further, described sub-correlator block comprises the unit that multiplies each other, the first input end of the described unit that multiplies each other is connected with the output terminal of described frequency deviation adjusting module, the second input end of the described unit that multiplies each other is connected with the 3rd output terminal of described counter, the 3rd input end of the described unit that multiplies each other is connected with the output terminal of described GOLD code generation module, and the output terminal of the described unit that multiplies each other is connected with cumulative unit, signed magnitude arithmetic(al) unit and peak detection unit in turn.
further, described frequency deviation adjusting module comprises the second digital controlled oscillator and frequency deviation control module, the first input end of described the second digital controlled oscillator is connected with the output terminal of described address control module, the second input end of described the second digital controlled oscillator is connected with the second output terminal of described counter, the output terminal of described the second digital controlled oscillator is connected with the first input end of described frequency deviation control module, the second input end of described frequency deviation control module and described counter the second output terminal be connected, the output terminal of described frequency deviation control module is connected with the input end of described sub-correlator block.
Further, described sub-correlator block also comprises to be removed and reset unit, the first output terminal of described removing and reset unit is connected with the input end of the described unit that multiplies each other, the second output terminal of described removing and reset unit is connected with the input end of described cumulative unit, the 3rd output terminal of described removing and reset unit is connected with the input end of described signed magnitude arithmetic(al) unit, and the 4th output terminal of described removing and reset unit is connected with the input end of described peak detection unit.
Further, described sub-correlator block is the sub-correlator of one or more parallel joins.
Further, the output terminal of described correlator also is connected with tracking module, described tracking module comprises delay lock loop, phaselocked loop and the FLL of connection arranged side by side, the input end of described delay lock loop is connected with the first output terminal of described correlator, the input end of described phaselocked loop is connected with the second output terminal of described correlator, and the input end of described FLL is connected with the 3rd output terminal of described correlator.
The beneficial effects of the utility model are: comprise the correlator for relevant search, can carry out flexible configuration to resource and search speed in search procedure, thereby improve the utilization factor of resource.And different capture systems only need to be replaced local GOLD code generator and adjust the speed of calculating, and are compatible and better portable.Further, sub-correlator block is the sub-correlator of one or more parallel joins, so the utility model can suitably increase or reduce the number of sub-correlator, reaching the balance of resource and search speed, thereby satisfies the demand of different application scene.
Description of drawings
Fig. 1 is the system chart of the positioning satellite signal capture systems of a kind of high flexibility ratio of the utility model;
Fig. 2 is the composition frame chart of the utility model correlator block;
Fig. 3 is the composition frame chart of the utility model correlator submodule;
Fig. 4 is the composition frame chart of the utility model frequency deviation adjusting module
Embodiment
Below in conjunction with Figure of description, embodiment of the present utility model is described further.
With reference to Fig. 1, a kind of positioning satellite signal capture systems of high flexibility ratio, this system comprises: this system comprises the first digital controlled oscillator, the output terminal of described the first digital controlled oscillator is connected with half-band filter, withdrawal device, mnemonic and correlator in turn.
Wherein, the first digital controlled oscillator is used for input signal is carried out Digital Down Convert, thereby generates the inphase quadrature signal; Half-band filter is for the high frequency noise of filtering inphase quadrature signal; Withdrawal device is used for filtered signal is extracted, thereby reduces the speed of signal; Mnemonic is used for the signal after storage is extracted; Correlator is used for extracting signal from mnemonic and carries out relevant search.And the digital medium-frequency signal of the input signal of the first digital controlled oscillator for processing through analog down, analog to digital conversion etc.At first the digital medium-frequency signal of input is divided into two paths of signals through the first digital controlled oscillator: orthogonal component signal and in-phase component signal.Then, after orthogonal component signal is processed through the first half-band filter and the first withdrawal device successively and then store at mnemonic, and the in-phase component signal process through the second half-band filter and the second withdrawal device successively after so that store at mnemonic.At last, correlator extracts storage signal from mnemonic and carries out relevant search, thus settling signal catch this process.In the present embodiment, correlator carries out flexible configuration (balancing resource and search speed according to actual needs) to resource and search speed in search procedure, can satisfy different resource demand and speed requirement, thereby improves the utilization factor of resource.
with reference to Fig. 2, be further used as preferred embodiment, described correlator comprises the address control module, the frequency deviation adjusting module, sub-correlator block, counter and GOLD code generation module, the first input end of described address control module is connected with the output terminal of described mnemonic, the second input end of described address control module is connected with the first output terminal of described counter, the output terminal of described address control module is connected with the first input end of described frequency deviation adjusting module, the second input end of described frequency deviation adjusting module is connected with the second output terminal of described counter, the output terminal of described frequency deviation adjusting module is connected with the first input end of described sub-correlator block, the second input end of described sub-correlator block is connected with the 3rd output terminal of described counter, the 3rd input end of described sub-correlator block is connected with the output terminal of described GOLD code generation module, the input end of described GOLD code generation module is connected with the 4th output terminal of described counter.
Wherein, the address control module is for the data that read mnemonic; The frequency deviation adjusting module be used for to be adjusted the frequency deviation of the data-signal that the address control module reads; GOLD code generation module is used for generating local GOLD code; Sub-correlator block is used for the local GOLD code of the signal after the overdeviation adjustment and the generation of GOLD code generation module is carried out related operation, judges whether that corresponding pseudo-random code exists; Counter is for the calculating time order and speed of controlling described address control module, frequency deviation adjusting module, GOLD code generation module and sub-correlator block.In addition, input signal is the two paths of signals of mnemonic storage, and the GOLD code is a kind of of pseudo-random code, offers sub-correlator block and carries out computing and generate local GOLD code, and counter is used for guaranteeing the data proper flow between each module.
With reference to Fig. 3, be further used as preferred embodiment, described sub-correlator block comprises the unit that multiplies each other, the first input end of the described unit that multiplies each other is connected with the output terminal of described frequency deviation adjusting module, the second input end of the described unit that multiplies each other is connected with the 3rd output terminal of described counter, the 3rd input end of the described unit that multiplies each other is connected with the output terminal of described GOLD code generation module, and the output terminal of the described unit that multiplies each other is connected with cumulative unit, signed magnitude arithmetic(al) unit and peak detection unit in turn.
Wherein, the unit that multiplies each other is used for the signal after the overdeviation adjustment is carried out multiplication mutually with the local GOLD code that generates; Cumulative unit is used for the data after multiplying each other are carried out accumulation process; The signed magnitude arithmetic(al) unit is used for the data after cumulative are asked signed magnitude arithmetic(al); Peak detection unit, for detection of the peak value of asking the signal after signed magnitude arithmetic(al), and positional information and the energy information of output peak value.And sub-correlator block is consistent with matched filter to the search procedure of signal, all utilize local GLOD code and the input signal that generates multiply each other, cumulative and ask absolute value, and then search for (being the peak value detection) information such as corresponding position, energy when seeking out maximal value by displacement.In the present embodiment, sub-correlator block has adopted first to add up does relevant irrelevant accumulate mode again, from traditional irrelevant cumulative different, it prevents by the step-size in search that reduces Doppler frequency deviation the cumulative counteracting that frequency deviation causes, thereby has reduced the consumption of mnemonic.The irrelevant accumulative frequency * of the step-size in search=0.5/[of Doppler frequency deviation (sub-correlator persistence length/4092))].The step-size in search maximal value of Doppler frequency deviation is 0.5khz, can reduce according to actual needs the step-size in search of Doppler frequency deviation in search procedure, namely prevents by improving search precision the cumulative counteracting that frequency deviation causes.Such as step-size in search being become 0.25khz, 0.125khz and 0.0625khz etc.
with reference to Fig. 4, be further used as preferred embodiment, described frequency deviation adjusting module comprises the second digital controlled oscillator and frequency deviation control module, the first input end of described the second digital controlled oscillator is connected with the output terminal of described address control module, the second input end of described the second digital controlled oscillator is connected with the second output terminal of described counter, the output terminal of described the second digital controlled oscillator is connected with the first input end of described frequency deviation control module, the second input end of described frequency deviation control module and described counter the second output terminal be connected, the output terminal of described frequency deviation control module is connected with the input end of described sub-correlator block.
Wherein, the second digital controlled oscillator is for the Doppler frequency deviation of search input signal; The frequency deviation control module is for the size and Orientation of controlling Doppler frequency deviation.
Be further used as preferred embodiment, described sub-correlator block also comprises to be removed and reset unit, the first output terminal of described removing and reset unit is connected with the input end of the described unit that multiplies each other, the second output terminal of described removing and reset unit is connected with the input end of described cumulative unit, the 3rd output terminal of described removing and reset unit is connected with the input end of described signed magnitude arithmetic(al) unit, and the 4th output terminal of described removing and reset unit is connected with the input end of described peak detection unit.Wherein, multiply each other unit, cumulative unit, signed magnitude arithmetic(al) unit and peak detection unit is provided with and removes and reset unit.The signal of removing and reset unit can manually be inputted.
Be further used as preferred embodiment, described sub-correlator block is the sub-correlator of one or more parallel joins.
Wherein, sub-correlator adopts non real-time relevant mode, therefore can utilize the quantity of the sub-correlator of increase and decrease to control resource and search speed.The below is described further sub-correlator of the present utility model:
(1) the minimum persistence length of sub-correlator is 1023*4, and minimum search length is also 1023*4, and the memory length of mnemonic depends on the persistence length of sub-correlator;
(2) frequency of operation of sub-correlator is 102.3Mhz or 102.3Mhz above (design the frequency of operation of sub-correlator according to practical wiring sequential situation, for example frequency of operation is 153.45Mhz).
(3) calculate search time
Adopt 1 sub-correlator (to suppose 37 stars of search, the frequency deviation hunting zone is-12khz～+ 12khz, sub-correlator persistence length is 4092, the frequency deviation step-size in search is 0.5khz, and the correlator frequency of operation is 102.3Mhz) the search time=[1023*4*1023*4*37*(24/0.5)]/(102.3*10e6)=290.7s;
And adopt 24 sub-correlators (to suppose 24 stars of search, the frequency deviation hunting zone be 0khz～+ 12khz, sub-correlator persistence length is 4092, the frequency deviation step-size in search is 0.5khz, and the correlator frequency of operation is 122.76Mhz) the search time=[1023*4*1023*4*24*(12/0.5)]/(24*122.76*10e6)=3.27s.
Can see, sub-correlator is more, and search speed is faster, but can correspondingly take more resource.A plurality of sub-correlators are arranged side by side when searching for.Therefore, the mode that the process that a plurality of GOLD code sequences are searched for both can adopt 1 sub-correlator repeatedly to search for also adopts a plurality of sub-correlators simultaneously to the mode of a plurality of GOLD code searchings, and shorten dramatically the latter's search time.And the quantity of sub-correlator do not limit by the number of search of satellite, and for example resource satisfies in situation, searches for 24 stars and can adopt 48 or above sub-correlator.
In addition, different satellite systems only need to be replaced the maker of local GOLD code and be adjusted the speed of calculating, and can complete the switching of different satellite systems.
Be further used as preferred embodiment, the output terminal of described correlator also is connected with tracking module, described tracking module comprises delay lock loop, phaselocked loop and the FLL of connection arranged side by side, the input end of described delay lock loop is connected with the first output terminal of described correlator, the input end of described phaselocked loop is connected with the second output terminal of described correlator, and the input end of described FLL is connected with the 3rd output terminal of described correlator.
Wherein, delay lock loop is used for carrying out code tracking; Phaselocked loop is used for carrying out carrier phase tracking; FLL is used for carrying out frequency-tracking.
More than that better enforcement of the present utility model is illustrated, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art make all equivalent variations or replacement also can doing under the prerequisite of the utility model spirit, the distortion that these are equal to or replace all is included in the application's claim limited range.
Claims (7)
1. the positioning satellite signal capture systems of a high flexibility ratio, is characterized in that, this system comprises the first digital controlled oscillator, and the output terminal of described the first digital controlled oscillator is connected with half-band filter, withdrawal device, mnemonic and correlator in turn.
2. the positioning satellite signal capture systems of a kind of high flexibility ratio according to claim 1, it is characterized in that, described correlator comprises the address control module, the frequency deviation adjusting module, sub-correlator block, counter and GOLD code generation module, the first input end of described address control module is connected with the output terminal of described mnemonic, the second input end of described address control module is connected with the first output terminal of described counter, the output terminal of described address control module is connected with the first input end of described frequency deviation adjusting module, the second input end of described frequency deviation adjusting module is connected with the second output terminal of described counter, the output terminal of described frequency deviation adjusting module is connected with the first input end of described sub-correlator block, the second input end of described sub-correlator block is connected with the 3rd output terminal of described counter, the 3rd input end of described sub-correlator block is connected with the output terminal of described GOLD code generation module, the input end of described GOLD code generation module is connected with the 4th output terminal of described counter.
3. the positioning satellite signal capture systems of a kind of high flexibility ratio according to claim 2, it is characterized in that, described sub-correlator block comprises the unit that multiplies each other, the first input end of the described unit that multiplies each other is connected with the output terminal of described frequency deviation adjusting module, the second input end of the described unit that multiplies each other is connected with the 3rd output terminal of described counter, the 3rd input end of the described unit that multiplies each other is connected with the output terminal of described GOLD code generation module, and the output terminal of the described unit that multiplies each other is connected with cumulative unit, signed magnitude arithmetic(al) unit and peak detection unit in turn.
4. the positioning satellite signal capture systems of a kind of high flexibility ratio according to claim 3, it is characterized in that, described frequency deviation adjusting module comprises the second digital controlled oscillator and frequency deviation control module, the first input end of described the second digital controlled oscillator is connected with the output terminal of described address control module, the second input end of described the second digital controlled oscillator is connected with the second output terminal of described counter, the output terminal of described the second digital controlled oscillator is connected with the first input end of described frequency deviation control module, the second input end of described frequency deviation control module and described counter the second output terminal be connected, the output terminal of described frequency deviation control module is connected with the input end of described sub-correlator block.
5. the positioning satellite signal capture systems of a kind of high flexibility ratio according to claim 4, it is characterized in that, described sub-correlator block also comprises to be removed and reset unit, the first output terminal of described removing and reset unit is connected with the input end of the described unit that multiplies each other, the second output terminal of described removing and reset unit is connected with the input end of described cumulative unit, the 3rd output terminal of described removing and reset unit is connected with the input end of described signed magnitude arithmetic(al) unit, and the 4th output terminal of described removing and reset unit is connected with the input end of described peak detection unit.
6. the positioning satellite signal capture systems of according to claim 2-5 described a kind of high flexibility ratios of any one, is characterized in that, described sub-correlator block is the sub-correlator of one or more parallel joins.
7. the positioning satellite signal capture systems of according to claim 1-5 described a kind of high flexibility ratios of any one, it is characterized in that, the output terminal of described correlator also is connected with tracking module, described tracking module comprises delay lock loop, phaselocked loop and the FLL of connection arranged side by side, the input end of described delay lock loop is connected with the first output terminal of described correlator, the input end of described phaselocked loop is connected with the second output terminal of described correlator, and the input end of described FLL is connected with the 3rd output terminal of described correlator.
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| CN 201220627626 CN202975331U (en) | 2012-11-23 | 2012-11-23 | High-dexterity positioning satellite signal capture system |
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| CN 201220627626 CN202975331U (en) | 2012-11-23 | 2012-11-23 | High-dexterity positioning satellite signal capture system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837878A (en) * | 2014-02-12 | 2014-06-04 | 深圳市峰华经纬科技有限公司 | Method for acquiring GNSS satellite signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837878A (en) * | 2014-02-12 | 2014-06-04 | 深圳市峰华经纬科技有限公司 | Method for acquiring GNSS satellite signal |
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