CN114279444A - GNSS-like indoor navigation signal system design system - Google Patents
GNSS-like indoor navigation signal system design system Download PDFInfo
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- CN114279444A CN114279444A CN202111474098.0A CN202111474098A CN114279444A CN 114279444 A CN114279444 A CN 114279444A CN 202111474098 A CN202111474098 A CN 202111474098A CN 114279444 A CN114279444 A CN 114279444A
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Abstract
The invention discloses a GNSS-like indoor navigation signal system design system, which comprises: the signal characteristics comprise carrier frequency, a signal modulation mode, a signal spread spectrum code and a signal working bandwidth, and the message information is broadcasted by an indoor communication link; generating a signal ranging code, wherein the rate of the ranging code is 20.46MHz, the code length is 1023, and the period is 50 us; signal modulation, namely generating a required signal by adopting a BPSK mode; the signal message, including message content, message frame header, message structure and check mode, is broadcast through the base station. The signal design of the invention adopts a larger bandwidth design, provides better anti-multipath capability and improves the stable capture probability of the signal; the short-period pulse design is adopted, so that the mutual interference among signals is reduced; defining a text protocol suitable for indoor environment; the indoor navigation message transmission mode is changed, the information acquisition time is prolonged, and the analysis time is shortened.
Description
Technical Field
The invention relates to the technical field of satellite navigation, in particular to a GNSS-like indoor navigation signal system design system.
Background
Currently, base station signals applied to indoor environments are generally divided into two types, one type is positioning based on an indoor communication base station, including WIFI, 4G/5G mobile communication network, Bluetooth and the like, and the signals are generally poor in accuracy and unstable in positioning. A navigation signal IS introduced indoors, mainly takes an IMES system of Japan as a main part, navigation chip manufacturers such as an indoor pseudo satellite positioning system IMES, a Mactong and the like of GPS signals of Japan also provide corresponding GNSS/IMES navigation chips, and an IMES signal interface protocol IS written into IS-QZSS-1.4 and IS incorporated into the construction of the QZSS system.
The Locata system is a special indoor and outdoor positioning technology which is mature relative to the prior art, and the LocataLite pseudolite mainly adopts a signal diversity transmission technology, mainly comprises frequency, space and polarization diversity technologies, and is used for inhibiting multipath fading caused by indoor multipath effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an indoor navigation signal system design system similar to a GNSS.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a GNSS-like indoor navigation signal system design system, which comprises;
the signal characteristics comprise carrier frequency, a signal modulation mode, a signal spread spectrum code and a signal working bandwidth, and the message information is broadcasted by an indoor communication link;
generating a signal ranging code, wherein the rate of the ranging code is 20.46MHz, the code length is 1023, and the period is 50 us;
signal modulation, namely generating a required signal by adopting a BPSK mode;
the signal message comprises a message content, a message frame header, a message structure and a verification mode;
and the base station broadcasts, and the information sent by the base station is acquired by the user terminal.
As a preferred technical solution of the present invention, the carrier frequency adopts 1575.42Mhz, the signal modulation mode is BPSK modulation, the signal spreading code adopts a high frequency ranging code, and the signal operating bandwidth is 40.92 Mhz.
As a preferred embodiment of the present invention, the ranging code is generated by modulo two of two linear sequences G1 and G2 and generating a balanced Gold code and then truncating 1chip, and the G1 and G2 sequences are generated by two 11-stage linear shift registers, respectively, and the generating polynomial is as follows:
G1(X)＝1+X+X7+X8+X9+X10+X11
G2(X)＝1+X+X2+X3+X4+X5+X8+X9+X11。
as a preferred technical solution of the present invention, the initial phases of G1 and G2 are:
initial phase of G1 sequence: 01010101010, respectively;
initial phase of G2 sequence: 01010101010.
as a preferred technical solution of the present invention, the text content includes a base station ID, an MsOMis intra-week count, an MsOW intra-week count, a week number, a coordinate X, a coordinate Y, a coordinate Z, a region division code, and a reserved bit, the header of the text frame is 10110111110, and the check mode bit is CRC 6.
Compared with the prior art, the invention has the following beneficial effects:
the signal design of the invention adopts a larger bandwidth design, provides better anti-multipath capability and improves the stable capture probability of the signal; the short-period pulse design is adopted, so that the mutual interference among signals is reduced; defining a text protocol suitable for indoor environment; the indoor navigation message transmission mode is changed, the information acquisition time is prolonged, and the analysis time is shortened; the multipath resistance of the conventional navigation signal in the indoor complex environment is effectively improved; the navigation message analysis time is effectively reduced, and the message transmission rate and the transmission reliability are improved; the mutual interference characteristic of multiple signals is effectively inhibited, and the anti-near-far effect is improved; the navigation positioning function of the indoor environment is solved, and high-precision indoor time service is provided; and provides new positioning feasibility for indoor environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a diagram of BPSK modulation scheme in an embodiment;
FIG. 2 is a schematic diagram of a ranging code generator;
FIG. 3 is a signal modulation diagram;
FIG. 4 is a text content diagram;
FIG. 5 is a schematic diagram of a message structure;
FIG. 6 is a base station broadcast diagram;
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
As shown in fig. 1-6, the present invention provides a GNSS-like indoor navigation signal system design system, which includes;
the signal characteristics comprise carrier frequency, a signal modulation mode, a signal spread spectrum code and a signal working bandwidth, and the message information is broadcasted by an indoor communication link;
generating a signal ranging code, wherein the rate of the ranging code is 20.46MHz, the code length is 1023, and the period is 50 us;
signal modulation, namely generating a required signal by adopting a BPSK mode, as shown in FIG. 3;
the signal message comprises a message content, a message frame header, a message structure and a verification mode, wherein the message content is shown in figure 4, and the message structure is shown in figure 5;
the base station broadcasts, and the information sent by the base station is acquired by the user terminal, as shown in fig. 6.
Furthermore, the carrier frequency adopts 1575.42Mhz, the signal modulation mode is BPSK modulation, the signal spreading code adopts a high-frequency ranging code, and the signal working bandwidth is 40.92 MHz.
Further, the ranging code is generated by two linear sequences, G1 and G2, modulo two, and truncated 1chip after generating balanced Gold code, and G1 and G2 sequences are generated by two 11-stage linear shift registers, respectively, and the generating polynomial is shown as follows:
G1(X)＝1+X+X7+X8+X9+X10+X11
G2(X)＝1+X+X2+X3+X4+X5+X8+X9+X11。
further, the initial phases of G1 and G2 are:
initial phase of G1 sequence: 01010101010, respectively;
initial phase of G2 sequence: 01010101010
The ranging code generator is shown in figure 2.
Further, the text content includes a base station ID, MsOMis intra-week count, MsOW intra-week count, week number, coordinate X, coordinate Y, coordinate Z, a region division code, and a reserved bit, the header of the text is 10110111110, and the check mode bit CRC 6.
The message structure is shown in fig. 5, where the total length of the message data is 300 bits, the data is split into data packets with 30 bits as basic units, the data packets include 10 data packets in total, and each data packet includes 24 bits of original data and 6 bits of check data.
The CRC6 check algorithm uses the standard CRC-6/ITU algorithm with a polynomial of x6+ x +1 and an initial value of all 0's.
Specifically, taking a GPS signal as an example, the GPS signal is composed of three parts, a navigation message, a spreading code, and a carrier frequency.
The navigation message rate is 50bps (bit per second), that is, 1 second has 01 data of 50 bits, and each bit time length is 20 milliseconds.
The spreading code, also called ranging code or pseudo-random sequence, is a periodic pseudo-random sequence with a code rate of 1.023mcps (mega chip per second), and a chip period of 1023 chips, i.e. 1 second has 20000 chip periods, each chip period contains 1023 chips, so that the time length of each chip is 1/1.023e6 ≈ 0.0488758 microseconds.
The carrier frequency, the GPS carrier frequency is 1575.42MHz, that is, the time length of a sinusoidal signal is 0.6347ns, the propagation speed of the electromagnetic wave in space is 299792458.0m/s, and then the length of a sinusoidal signal is 0.19 cm.
The GPS signal is BPSK modulated, as shown in fig. 1.
The navigation message is loaded in a spreading code through XOR operation, the spreading code is loaded in a carrier through BPSK modulation, a carrier signal is transmitted through an antenna to realize signal generation, the relation between the spreading code and the carrier frequency in figure 1 is that 1 spreading code comprises 1577 carrier sinusoidal signals, and the application of an indoor environment is realized through adjusting the signal on the basis of not changing basic information.
The signal design of the invention adopts a larger bandwidth design, provides better anti-multipath capability and improves the stable capture probability of the signal; the short-period pulse design is adopted, so that the mutual interference among signals is reduced; defining a text protocol suitable for indoor environment; the indoor navigation message transmission mode is changed, the information acquisition time is prolonged, and the analysis time is shortened.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A GNSS-like indoor navigation signal system design system is characterized by comprising:
the signal characteristics comprise carrier frequency, a signal modulation mode, a signal spread spectrum code and a signal working bandwidth, and the message information is broadcasted by an indoor communication link;
generating a signal ranging code, wherein the rate of the ranging code is 20.46MHz, the code length is 1023, and the period is 50 us;
signal modulation, namely generating a required signal by adopting a BPSK mode;
the signal message comprises a message content, a message frame header, a message structure and a verification mode;
and the base station broadcasts, and the information sent by the base station is acquired by the user terminal.
2. The GNSS-like indoor navigation signal system design system of claim 1, wherein the carrier frequency is 1575.42Mhz, the signal modulation scheme is BPSK modulation, the signal spreading code is a high frequency ranging code, and the signal operating bandwidth is 40.92 Mhz.
3. The GNSS-like indoor navigation signal system design system of claim 1, wherein the ranging codes are generated by two linear sequences G1 and G2 modulo two and generating balanced Gold code and then truncating 1chip, and G1 and G2 sequences are generated by two 11-stage linear shift registers respectively, and the generating polynomial is as follows:
G1(X)＝1+X+X7+X8+X9+X10+X11
G2(X)＝1+X+X2+X3+X4+X5+X8+X9+X11。
4. the GNSS-like indoor navigation signal system design system of claim 3, wherein the initial phases of G1 and G2 are:
initial phase of G1 sequence: 01010101010, respectively;
initial phase of G2 sequence: 01010101010.
5. the GNSS-like indoor navigation signal system design system of claim 1, wherein the text content comprises BS ID, MsOMis week count, MsOW week count, week number, coordinate X, coordinate Y, coordinate Z, region division code and reserved bits, the header of the text is 10110111110, and the check mode bit CRC 6.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887113A (en) * | 2009-05-13 | 2010-11-17 | 中国科学院国家天文台 | Signal structure integrating navigation and communication |
| CN109444923A (en) * | 2018-12-03 | 2019-03-08 | 桂林电子科技大学 | A kind of Beidou three generations satellite-signal simulation system and analog signal generating method |
| CN112213746A (en) * | 2020-10-13 | 2021-01-12 | 北京首科信通科技有限责任公司 | Positioning method and device |
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- 2021-12-02 CN CN202111474098.0A patent/CN114279444A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101887113A (en) * | 2009-05-13 | 2010-11-17 | 中国科学院国家天文台 | Signal structure integrating navigation and communication |
| CN109444923A (en) * | 2018-12-03 | 2019-03-08 | 桂林电子科技大学 | A kind of Beidou three generations satellite-signal simulation system and analog signal generating method |
| CN112213746A (en) * | 2020-10-13 | 2021-01-12 | 北京首科信通科技有限责任公司 | Positioning method and device |
Non-Patent Citations (2)
| Title |
|---|
| 中国卫星导航***管理办公室: "北斗卫星导航***空间信号接口控制文件（测试版）" * |
| 李时俊: "一种基于模拟GNSS信号的室内定位方法研究" * |
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Application publication date: 20220405 |