CN102186240A - Auxiliary positioning device and method by adopting CDMA (Code Division Multiple Access) system - Google Patents
Auxiliary positioning device and method by adopting CDMA (Code Division Multiple Access) system Download PDFInfo
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- CN102186240A CN102186240A CN2011101027953A CN201110102795A CN102186240A CN 102186240 A CN102186240 A CN 102186240A CN 2011101027953 A CN2011101027953 A CN 2011101027953A CN 201110102795 A CN201110102795 A CN 201110102795A CN 102186240 A CN102186240 A CN 102186240A
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Abstract
The invention relates to an auxiliary positioning device and method by adopting a CDMA (Code Division Multiple Access) system. The auxiliary positioning device comprises an antenna module, a lower frequency mixing module, an ADC (Analog to Digital Converter) module, a baseband processing module, a PN (Pseudo-Noise) bias acquisition module and a positioning module. The auxiliary positioning method comprises the following steps of: receiving a signal transmitted by a base station through the antenna module; sequentially processing the signal through the lower frequency mixing module, an ADC sampling module, a DDC (Digital Down Converter), and the baseband processing module; acquiring a PN offset received by handheld equipment and a PN bias of a peripheral base station of the handheld equipment through a baseband processing sequence by the PN bias acquisition module; mapping position coordinates of a corresponding base station according to the PN bias; and completing the positioning process of the handheld equipment by the positioning module according to data acquired by the PN bias acquisition module. The auxiliary positioning device and method have the following beneficial effect: the handheld equipment can be positioned by dint of a CDMA base station.
Description
Technical field
The present invention relates to be applicable to the location technology that exists the CDMA signal to cover, mainly is a kind of device and method that utilizes the cdma system assist location.
Background technology
In the cdma system, have the PN sequence, by the PN short code sequence to spread spectrum after sequence carry out multiple scrambler, identical PN short code sequence is used in the base station, still, the PN short code sequence biasing that adopt different base stations is different.Can distinguish the base station by different PN short code sequence biasings.
At spreading rate 1, PN sequence generator polynomial is:
P
I(x)＝x
15+x
13+x
9+x
8+x
7+x
5+1 (1)
P
Q(x)＝x
15+x
12+x
11+x
10+x
6+x
5+x
4+x
3+1 (2)
Wherein, P
I(x) be I road generator polynomial, P
Q(x) being Q road generator polynomial, is 2 based on the maximum length of above-mentioned polynomial linear feedback shift register sequence i (n) and q (n)
15-1, be 32768=2 in order to obtain I and Q road cycle
15The PN short code sequence, 14 continuous outputs ' 0 ' output once only took place in each cycle after, to one ' 0 ' of insertion among i (n) and the q (n); Therefore the PN short code sequence has 15 ' 0 ' continuous outputs.
32768 PN sequences that Q road, I road generates are divided into 512 groups by chip offset, and the side-play amount size is 64 chip lengths.512 groups of PN sequences are denoted as PN0, and PN1L PN511, PN0 are called PN and are biased to 0 PN biasing.512 groups of PN sequences obtain by 32768 chip cyclic shifts, and the PN0 original position is ' 1 ' after 15 continuous ' 0 ' outputs; PN n original position is PN0+64*n.
Based on cdma system to be decided to be method as follows, base station location is fixed, the synchronization handheld device receives three or above base station signal simultaneously, by the distance between this signal measurement handheld device and three base stations, thus location handheld device particular location.The distance of measuring in the method between three equipment and the base station is to determine by the time of measuring base station transmit signals arrival handheld device.Be specially that the PN sequence that sends by base stations detected realizes.
Summary of the invention
Purpose of the present invention will overcome the deficiency of above-mentioned technology just, and a kind of device and method that utilizes the cdma system assist location is provided.
The present invention solves the technical scheme that its technical problem adopts: this device that utilizes the cdma system assist location comprises Anneta module, following frequency mixing module, ADC module, DDC module, baseband processing module, PN biasing acquisition module and locating module; PN biasing acquisition module comprises FFT submodule, local PN sub module stored, conjugation submodule, submodule and signal processing module multiply each other, Anneta module is by frequency mixing module, ADC module, DDC module, baseband processing module are connected with the FFT submodule down, the FFT submodule is connected with the submodule that multiplies each other respectively by the FFT submodule by conjugation submodule, local PN sub module stored, and the submodule that multiplies each other is connected with signal processing module; Signal processing module is connected and is connected with locating module.
Anneta module is from base station received signal, for subsequent operation provides source signal;
Following frequency mixing module will become intermediate-freuqncy signal from the radiofrequency signal that antenna receives;
The ADC module receives analog intermediate frequency signal from frequency mixing module, and the analog-signal transitions that receives is become digital medium-frequency signal, for the post-digital signal processing provides digital signal.
The DDC module may be made up of each carrier wave from the digital medium-frequency signal that the ADC module receives, and the DDC module is transformed into the zero intermediate frequency digital signal with each carrier signal.
Baseband processing module, the zero intermediate frequency digital signal from the DDC module is extracted a carrier wave sequence, and by receiving filter this carrier wave sequence is handled.
The PN acquisition module of setovering is finished base station PN biasing and is extracted, and comprises the FFT submodule, local PN sub module stored, conjugation submodule, the submodule that multiplies each other, signal processing module.The FFT submodule is finished the FFT conversion to input signal, local PN sub module stored, storage PN is biased to 0 sequence, the conjugation submodule is finished list entries is got conjugate operation, and the submodule that multiplies each other is finished the input signal multiplication operations, and the signal processing submodule is finished N data first maximum that PN biasing in base station is extracted and the submodule that multiplies each other is exported according to input signal, second maximum, the pairing subscript value n1 of the 3rd maximum, n2, n3 extracts.It is as follows that the PN acquisition module obtains PN biasing step:
A, a carrier wave sequence top n sequence x who from baseband processing module, obtains
1(n) do N point FFT conversion and obtain Y
1(N), its mathematic(al) representation is
B, from handheld device the top n sequence x in the local PN sequence in the PN memory module
2(n) do N point FFT conversion and obtain Y
2(N), its mathematic(al) representation is
C, with a, output N point data respective items multiplies each other and obtains new N point sequence R (N) among the b, its mathematic(al) representation is R (N)=Y
1[N] Y
2[N];
D, get first maximum among the R (N), second maximum, the pairing subscript value PILOT_MEASURE1 of the corresponding maximum of the 3rd maximum and mark, PILOT_MEASURE2, PILOT_MEASURE3;
E, calculate first maximum according to (5) formula, second maximum, pairing three the base station PN biases of the 3rd maximum, if three base station PN biases obtaining are PN1, PN2, PN3, physical location table (being that each base station has only one latitude and longitude coordinates) according to base station side inquires PN1, PN2, physical coordinates position (the x1 of PN3 institute respective base station, y1), (x2, y2), (x3, y3).
Locating module comprises chip offset detection module, time detecting module, distance detecting module and location arithmetic element, and signal processing module is leaded up to chip offset detection module, time detecting module, distance detecting module and locate arithmetic element and be connected; Another road directly is connected with the location arithmetic element.
Locating module is finished the base station distance from handheld device to corresponding PN sequence correspondence, and according to the base station of three corresponding PN sequence correspondences, finishes the handheld device location, and this module comprises the timing module, range determination module, locating module.Timing module: measure base station transmission PN sequence and receive the time that this sequence experiences to handheld device.The range determination module is measured the distance between base station and the handheld device.Locating module detects three distance D ISTANCE1, DISTANCE2, and DISTANCE3 has been determined the coordinate position of handheld device by (7).Locating module concrete operations step is as follows:
A, according to three PN bias PN1, PN2, the PN3 of PN acquisition module output, and three pairing subscript value PILOT_MEASURE1 of maximum, PILOT_MEASURE2, PILOT_MEASURE3, calculation base station is to skew chip amount offset1, offset2, offset3, the wherein offset=PILOT_MEASURE-PN of handheld device;
B, according to skew chip amount amount offset1, offset2, offset3, calculation base station is to the time t1 that handheld device experienced, t2, t3, wherein t=offset/1.2288e6;
C, according to the time t1 that b calculated, t2, t3, calculation base station apart from handheld device apart from distance1, distance2, distance3, wherein distance=t*c (c is the light velocity);
The distance1 of d, c output, distance2, distance3, and the base station coordinates position that obtains of PN acquisition module (x1, y1), (x2, y2), (x3, y3), substitution (7) formula, get the coordinate that makes (7) formula minimum (x, y).
This method of utilizing the cdma system assist location of the present invention, after CDMA arranges net and finishes, each base station particular location is fixed, determine the particular location of hand position by measuring distance between handheld device and three or three the above base stations, measure distance between handheld device and the base station by detecting each base station PN sequence, concrete grammar is as follows:
1) detects the PN biasing handheld device periphery and that can be received three or three above base stations of signal by handheld device;
2) calculation base station transmits a signal to the time that reaches handheld device;
It is PILOT_MEASURE-PN to the chip offset that handheld device receives this sequence that the base station sends the PN sequence, and then base station transmit signals arrives the time T of handheld device;
T＝(PILOT_MEASURE-PN)/1.2288e6 (6)
3) distance between calculation base station and the handheld device;
Distance between base station and the handheld device is DISTANCE=T*C, and C is the light velocity;
4) determine the handheld device position
Detect three apart from disatance1, disatance2, disantance3 establishes base station 1, base station 2, and base station 3 coordinates are that (x1, y1), (x2, y2), (x3, y3), the coordinate points that makes handheld device is for (x y), establishes
f(x，y)＝(x-x
1)
2+(x-x
2)
2+(x-x
3)
2+(y-y
1)
2+(y-y
2)
2+(y-y
3)
2-disatance1
2-disatance2
2-disatance3
2
(7)
Find the solution (x, y) make f (x, y) minimum, obtain (x y) is the position of handheld device.
As preferably, detect the PN biasing handheld device periphery and that can be received three or three above base stations of signal by handheld device, method is as follows:
If handheld device is PILOT_MEASURE by the PN sequence offset amount that matched filter obtains, this parameter is made up of the chip offset that PN biasing and PN short code caused in time of time of space transmission and hardware handles, obtain in the cdma system parameter: pilot offset increment PI LOT_INC, this parameter is set when CDMA arranges net, and can obtain by inquiry;
PN biasing in base station is calculated by following formula and is obtained
Wherein
For rounding operation, suppose that the value of the PILOT_MEASURE that obtains by the receiving terminal matched filter is 200, PILOT_INC is 4.Then,
Can obtain the signal that receiving terminal receives and be biased to 4 base station from PN.
The effect that the present invention is useful is: described method can utilize handheld device to position by cdma base station.Receive the signal of base station by Anneta module, handle through mixing down, ADC sampling, DDC, baseband processing module successively, sequence by Base-Band Processing is obtained the PN side-play amount that handheld device is received through PN biasing acquisition module, and handheld device peripheral base station PN setovers and biasing maps out the corresponding base station position coordinates according to PN, locating module is finished the position fixing process to handheld device according to the data that PN biasing acquisition module obtains.
Description of drawings
Fig. 1 system configuration schematic diagram of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, reach for example below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that described hereinly, and be not used in qualification the present invention for example only in order to explaining the present invention.
The present invention mainly comprises Anneta module, following frequency mixing module, and the ADC module, the DDC module, baseband processing module, the PN acquisition module, locating module, as shown in Figure 1.
Anneta module is from base station received signal, for subsequent operation provides source signal.
Following frequency mixing module will become intermediate-freuqncy signal from the radiofrequency signal that antenna receives.
The ADC module receives analog intermediate frequency signal from frequency mixing module, and the analog-signal transitions that receives is become digital medium-frequency signal, for the post-digital signal processing provides digital signal.
The DDC module may be made up of each carrier wave from the digital medium-frequency signal that the ADC module receives, and the DDC module is transformed into the zero intermediate frequency digital signal with each carrier signal.
Baseband processing module, the zero intermediate frequency digital signal from the DDC module is extracted a carrier wave sequence.
The PN acquisition module is finished base station PN biasing and is extracted, and comprises the FFT submodule, local PN sub module stored, conjugation submodule, the submodule that multiplies each other, signal processing module.The FFT submodule is done 1024 FFT conversion to input signal, local PN sub module stored, storage PN is biased to 0 sequence, the conjugation submodule is finished list entries is got conjugate operation, and the submodule that multiplies each other is finished the input signal multiplication operations, and the signal processing submodule is finished N data first maximum that PN biasing in base station is extracted and the submodule that multiplies each other is exported according to input signal, second maximum, the pairing subscript value n1 of the 3rd maximum, n2, n3 extracts.It is as follows that the PN acquisition module obtains PN biasing step:
A, a carrier wave sequence top n sequence x who from baseband processing module, obtains
1(n) do N point FFT conversion and obtain Y
1(N), its mathematic(al) representation is
B, from handheld device the top n sequence x in the local PN sequence in the PN memory module
2(n) do N point FFT conversion and obtain Y
2(N), its mathematic(al) representation is
C, with a, output N point data respective items multiplies each other and obtains new N point sequence R (N) among the b, its mathematic(al) representation is R (N)=Y
1[N] Y
2[N];
D, get first maximum among the R (N), second maximum, the pairing subscript value PILOT_MEASURE1 of the corresponding maximum of the 3rd maximum and mark, PILOT_MEASURE2, PILOT_MEASURE3;
E, calculate first maximum according to (5) formula, second maximum, pairing three the base station PN biases of the 3rd maximum, if three base station PN biases obtaining are PN1, PN2, PN3, physical location table (being that each base station has only one latitude and longitude coordinates) according to base station side inquires PN1, PN2, physical coordinates position (the x1 of PN3 institute respective base station, y1), (x2, y2), (x3, y3).
Locating module, locating module are finished the base station distance from handheld device to corresponding PN sequence correspondence, and according to the base station of three corresponding PN sequence correspondences, finish the handheld device location, and this module comprises the timing module, range determination module, locating module.Timing module: measure base station transmission PN sequence and receive the time that this sequence experiences to handheld device.The range determination module is measured the distance between base station and the handheld device.Locating module detects three distance D ISTANCE1, DISTANCE2, and DISTANCE3 has been determined the coordinate position of handheld device by (7).Locating module concrete operations step is as follows:
A, according to three PN bias PN1, PN2, the PN3 of PN acquisition module output, and three pairing subscript value PILOT_MEASURE1 of maximum, PILOT_MEASURE2, PILOT_MEASURE3, calculation base station is to skew chip amount offset1, offset2, offset3, the wherein offset=PILOT_MEASURE-PN of handheld device;
B, according to skew chip amount amount offset1, offset2, offset3, calculation base station is to the time t1 that handheld device experienced, t2, t3, wherein t=offset/1.2288e6;
C, according to the time t1 that b calculated, t2, t3, calculation base station apart from handheld device apart from distance1, distance2, distance3, wherein distance=t*c (c is the light velocity);
The distance1 of d, c output, distance2, distance3, and the base station coordinates position that obtains of PN acquisition module (x1, y1), (x2, y2), (x3, y3), substitution (7) formula, get the coordinate that makes (7) formula minimum (x, y).
Be understandable that, for a person skilled in the art, technical scheme of the present invention and inventive concept be equal to replacement or change the protection range that all should belong to the appended claim of the present invention.
Claims (4)
1. a device that utilizes the cdma system assist location is characterized in that: comprise Anneta module, following frequency mixing module, ADC module, DDC module, baseband processing module, PN biasing acquisition module and locating module; PN biasing acquisition module comprises FFT submodule, local PN sub module stored, conjugation submodule, submodule and signal processing module multiply each other, Anneta module is by frequency mixing module, ADC module, DDC module, baseband processing module are connected with the FFT submodule down, the FFT submodule is connected with the submodule that multiplies each other respectively by the FFT submodule by conjugation submodule, local PN sub module stored, and the submodule that multiplies each other is connected with signal processing module; Signal processing module is connected and is connected with locating module.
2. the device that utilizes the cdma system assist location according to claim 1, it is characterized in that: described locating module comprises chip offset detection module, time detecting module, distance detecting module and location arithmetic element, and signal processing module is leaded up to chip offset detection module, time detecting module, distance detecting module and locate arithmetic element and be connected; Another road directly is connected with the location arithmetic element.
3. method of utilizing the cdma system assist location is characterized in that: measure distance between handheld device and the base station by detecting each base station PN sequence, concrete grammar is as follows:
1) detects the PN biasing handheld device periphery and that can be received three or three above base stations of signal by handheld device;
2) calculation base station transmits a signal to the time that reaches handheld device;
It is PILOT_MEASURE-PN to the chip offset that handheld device receives this sequence that the base station sends the PN sequence, and then base station transmit signals arrives the time T of handheld device;
T＝(PILOT_MEASURE-PN)/1.2288e6 (6)
3) distance between calculation base station and the handheld device;
Distance between base station and the handheld device is DISTANCE=T*C, and C is the light velocity;
4) determine the handheld device position;
Detect three apart from disatance1, disatance2, disantance3 establishes base station 1, base station 2, and base station 3 coordinates are that (x1, y1), (x2, y2), (x3, y3), the coordinate points that makes handheld device is for (x y), establishes
f(x，y)＝(x-x
1)
2+(x-x
2)
2+(x-x
3)
2+(y-y
1)
2+(y-y
2)
2+(y-y
3)
2-disatance1
2-disatance2
2-disatance3
2
(7)
Find the solution (x, y) make f (x, y) minimum, obtain (x y) is the position of handheld device.
4. the method for utilizing the cdma system assist location according to claim 3 is characterized in that: detect the PN biasing handheld device periphery and that can be received three or three above base stations of signal by handheld device, method is as follows:
If handheld device is PILOT_MEASURE by the PN sequence offset amount that matched filter obtains, this parameter is made up of the chip offset that PN biasing and PN short code caused in time of time of space transmission and hardware handles, obtain in the cdma system parameter: pilot offset increment PI LOT_INC, this parameter is set when CDMA arranges net, and can obtain by inquiry;
PN biasing in base station is calculated by following formula and is obtained
Wherein
For rounding operation.
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|---|---|---|---|
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760585A (en) * | 2014-01-09 | 2014-04-30 | 中国林业科学研究院资源信息研究所 | Satellite and earth combination positioning method applicable to forest region |
| CN105554702A (en) * | 2015-12-15 | 2016-05-04 | 广东欧珀移动通信有限公司 | Cross network positioning system and method, positioning server and mobile terminal |
| CN105554876A (en) * | 2015-12-09 | 2016-05-04 | 广东欧珀移动通信有限公司 | Mobile terminal positioning method and mobile terminal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760585A (en) * | 2014-01-09 | 2014-04-30 | 中国林业科学研究院资源信息研究所 | Satellite and earth combination positioning method applicable to forest region |
| CN105554876A (en) * | 2015-12-09 | 2016-05-04 | 广东欧珀移动通信有限公司 | Mobile terminal positioning method and mobile terminal |
| CN105554876B (en) * | 2015-12-09 | 2019-02-05 | Oppo广东移动通信有限公司 | A kind of mobile terminal locating method and mobile terminal |
| CN105554702A (en) * | 2015-12-15 | 2016-05-04 | 广东欧珀移动通信有限公司 | Cross network positioning system and method, positioning server and mobile terminal |
| CN105554702B (en) * | 2015-12-15 | 2019-02-05 | Oppo广东移动通信有限公司 | A kind of inter-network positioning system, method, location-server and mobile terminal |
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Application publication date: 20110914 |