CN107765214A - A kind of radio navigation system - Google Patents
A kind of radio navigation system Download PDFInfo
- Publication number
- CN107765214A CN107765214A CN201610680698.5A CN201610680698A CN107765214A CN 107765214 A CN107765214 A CN 107765214A CN 201610680698 A CN201610680698 A CN 201610680698A CN 107765214 A CN107765214 A CN 107765214A
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- CN
- China
- Prior art keywords
- signal
- radio navigation
- radio
- receiving terminal
- navigation
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- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0273—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves using multipath or indirect path propagation signals in position determination
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention belongs to wireless navigation technical field, is related to a kind of radio navigation system.Described system includes signal generation end, transmitting terminal and receiving terminal, it is characterized in that：Signal generation end generates the radio navigation signal of two frequency bins to same navigation information, and transmitting terminal includes two transmitting antennas, and every antenna sends the radio navigation signal of two frequency bins respectively；Receiving terminal includes an antenna, and receiving terminal receives four road radio navigation signals simultaneously by the root antenna, and merges processing to the signal of reception.Provide a kind of radio navigation system that can improve radio navigation signal quality.
Description
Technical field
The invention belongs to wireless navigation technical field, is related to a kind of radio navigation system.
Background technology
In the alignment system based on Radio Measurement, receiver is launched by navigation beacon platform known to receiving position
Navigator fix signal, unknown customer location is solved via geometric techniques (for example, hyperbolic fix, circular curve location method).And
When radio navigation signal is propagated in complex electromagnetic environment, reaching the signal of receiving terminal not only includes reaching by straight length
Direct wave, in addition to the reflection and scattering wave reached by different propagation paths, these are reached by different propagation paths
Signal generally possess different signal amplitudes, phase and propagation delay, the signal that receiving terminal receives is exactly that these are not gone the same way
The superposition of footpath signal, the signal after being superimposed are possible to enhancing and are also possible to cancel out each other, and form multipath fading so that radio
The quality of navigation signal is severely impacted.
In addition, to realize that radionavigation positions, generally require while receive the navigation from multiple navigation beacon platforms and determine
Position signal, but in many cases, receiver can not detect weaker navigation beacon platform signal (for example, receiver distance compared with
When remote), now with regard to needing to take certain technological means, to improve the sensitivity for receiving the weak navigation signal of machine testing.
The content of the invention
Present invention solves the technical problem that：A kind of radionavigation system that can improve radio navigation signal quality is provided
System.
Technical scheme：A kind of radio navigation system, described system include signal generation end, transmitting terminal and
Receiving terminal, it is characterized in that：Signal generation end generates the radio navigation signal of two frequency bins, transmitting terminal to same navigation information
Including two transmitting antennas, every antenna sends the radio navigation signal of two frequency bins respectively；
Receiving terminal includes an antenna, and receiving terminal receives four road radio navigation signals simultaneously by the root antenna, and right
The signal of reception merges processing.
Further, two antennas of transmitting terminal are at least separated by the wavelength of 10 radio carriers on space length.
Further, the frequency interval between two frequency bins is more than coherence bandwidth.
Further, receiving terminal is docked by the method for radio signal selection combining, equal gain combining or maximum-ratio combing
The signal of receipts merges processing.
Beneficial effects of the present invention：Two transmitting antennas are used in signal transmitting terminal, every antenna sends two frequencies respectively
The radio navigation signal of point, to same navigation information, there is provided four road navigation signal copies, in receiving terminal to four tunnels that receive
Navigation signal copy is merged using the method for selection combining, equal gain combining or maximum-ratio combing, so as to improve reception nothing
Line conductance boat signal quality, improves Radio Measurement precision.
Brief description of the drawings
Fig. 1 is the schematic diagram of the principle of the invention.
Embodiment
Below in conjunction with Fig. 1, the present invention will be further described, and described radio navigation system includes signal generation end, hair
End and receiving terminal are penetrated, it is characterized in that：Signal generation end generates the radio navigation signal of two frequency bins to same navigation information,
Transmitting terminal includes two transmitting antennas, and every antenna sends the radio navigation signal of two frequency bins respectively；Receiving terminal includes one
Root antenna, receiving terminal receives four road radio navigation signals simultaneously by the root antenna, and merges place to the signal of reception
Reason.
Two antennas of transmitting terminal are at least separated by the wavelength of 10 radio carriers on space length.Between two frequency bins
Frequency interval is more than coherence bandwidth, if the maximum multipath delay spread undergone in radio navigation signal transmitting procedure is
Tm, then coherence bandwidth Bc=1/Tm(T is required in theorymLess than the duration T of a symbolb).In this way it can be considered that hair
The road navigation signals of She tetra- are incoherent in the decline that space undergoes.
Signal of the receiving terminal by the method for radio signal selection combining, equal gain combining or maximum-ratio combing to reception
Merge processing.
1) selection combining (SC)：The 4 road navigation signal copies received are first sent into selection logic by selection combining, and selection is patrolled
Collect selection can have the signal of highest signal to noise ratio as exporting from 4 road navigation signal copies, and also referred to as switching regulator is added.
2) equal gain combining (EGC)：Also referred to as phase equalization, the 4 road navigation signal copies received are carried out with phase superposition,
The weight of 4 road signals is identical during superposition, and output signal envelope is after equal gain combining：
Wherein, riIt is the envelope of the i-th road navigation signal copy, rEGCFor the signal envelope after equal gain combining.
3) maximum-ratio combing (MRC)：Maximum-ratio combing is that a kind of relatively good signal merges mode, to 4 road navigation signals
Copy is weighted addition, and weight is determined by the signal voltage corresponding to each road signal and the ratio of noise power, i.e. high specific
Output signal envelope is after merging：
Wherein, ai=ri/NiIt is the signal to noise ratio of the weights of the i-th road navigation signal copy, i.e. the i-th road navigation signal copy, Ni
It is the i-th tunnel noise power.
Claims (4)
1. a kind of radio navigation system, described system includes signal generation end, transmitting terminal and receiving terminal, it is characterized in that：Letter
Number generation end generates the radio navigation signal of two frequency bins, transmitting terminal includes two transmitting antennas, often to same navigation information
Root antenna sends the radio navigation signal of two frequency bins respectively；
Receiving terminal includes an antenna, and receiving terminal receives four road radio navigation signals simultaneously by the root antenna, and to receiving
Signal merge processing.
2. a kind of radio navigation system according to claim 1, it is characterized in that：Two antennas of transmitting terminal space away from
From the upper wavelength for being at least separated by 10 radio carriers.
3. a kind of radio navigation system according to claim 1, it is characterized in that：Frequency interval between two frequency bins is more than
Coherence bandwidth.
4. a kind of radio navigation system according to claim 1, it is characterized in that：Receiving terminal is selected by radio signal
The method of merging, equal gain combining or maximum-ratio combing merges processing to the signal of reception.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610680698.5A CN107765214A (en) | 2016-08-17 | 2016-08-17 | A kind of radio navigation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610680698.5A CN107765214A (en) | 2016-08-17 | 2016-08-17 | A kind of radio navigation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107765214A true CN107765214A (en) | 2018-03-06 |
Family
ID=61260754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610680698.5A Pending CN107765214A (en) | 2016-08-17 | 2016-08-17 | A kind of radio navigation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107765214A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227683A (en) * | 1996-06-18 | 1999-09-01 | 艾利森电话股份有限公司 | Transmitter deversity assembly and associated method for radio transmitter |
| CN102645657A (en) * | 2012-04-27 | 2012-08-22 | 清华大学 | Same frequency point multi-way signal constant envelope combining transmitting method and circuit on navigational satellite |
-
2016
- 2016-08-17 CN CN201610680698.5A patent/CN107765214A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227683A (en) * | 1996-06-18 | 1999-09-01 | 艾利森电话股份有限公司 | Transmitter deversity assembly and associated method for radio transmitter |
| CN102645657A (en) * | 2012-04-27 | 2012-08-22 | 清华大学 | Same frequency point multi-way signal constant envelope combining transmitting method and circuit on navigational satellite |
Non-Patent Citations (3)
| Title |
|---|
| 代汶洲: "LOCATA系统关键技术研究及收发机发射模块设计", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
| 宋涛: "《通信工程质量监控与通病防治全书》", 31 January 2002 * |
| 莫秀玲 等: "MISO超宽带系统的性能分析", 《吉林大学学报(信息科学版)》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180306 |
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| RJ01 | Rejection of invention patent application after publication |