CN103439687B - A kind of measuring system of VHF signal additional secondary phase factor - Google Patents
A kind of measuring system of VHF signal additional secondary phase factor Download PDFInfo
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- CN103439687B CN103439687B CN201310368437.6A CN201310368437A CN103439687B CN 103439687 B CN103439687 B CN 103439687B CN 201310368437 A CN201310368437 A CN 201310368437A CN 103439687 B CN103439687 B CN 103439687B
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Abstract
The invention belongs to electrical wave measurement field, relate to continental rise location and radio wave propagation cross-application subject, be specifically related to a kind of measuring system of VHF signal additional secondary phase factor; Comprise bank station emission coefficient, fixing test point receiving system and mobile test point receiving system, the position of described bank station emission coefficient and fixing test point receiving system is known, and apart from closer (being less than 3km), the position of mobile test point receiving system is measured by RTK and obtained; Bank station emission coefficient produce and emissioning testing signal, it by sending and receiving end altogether depending on time service GPS, high-precise synchronization atomic clock, digital intermediate frequency measuring signal generator, D/A conversion module and up-converter module form; Its beneficial effect is: utilize the present invention can accurately measure the additional secondary phase factor of VHF signal in certain limit, for the ASF database setting up VHF signal provides measured data.
Description
Technical field
The invention belongs to electrical wave measurement field, relate to continental rise location and radio wave propagation cross-application subject, be specifically related to a kind of measuring system of VHF signal additional secondary phase factor.
Background technology
In order to ensure the navigation safety of boats and ships, be necessary space-based and continental rise double copies Position Fixing Navigation System are installed.The end product of current roadbed Position Fixing Navigation System is expensive, and boats and ships installation rate is very low.And AIS(Automatic identification System installed all by nearly all boats and ships) terminal device, main maritime province, the world covers AIS bank station system substantially, therefore, technology that boats and ships independently locate has a wide range of applications basis to utilize existing AIS system to carry out.But, the quadratic phase time delay of ais signal will inevitably impact positioning precision, therefore, need the additional secondary phase factor ASF(Additional Secondary Factor of measuring-signal), and create the ASF database of VHF signal, thus correction model can be set up according to measured data, reduce positioning error.
Summary of the invention
Object of the present invention is just to provide the measuring system of a kind of VHF signal ASF, and it is applicable to AIS boats and ships automatic positioning navigation system and carries out quadratic phase correction, improves positioning precision.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of measuring system of VHF signal additional secondary phase factor, comprise bank station emission coefficient, fixing test point receiving system and mobile test point receiving system, the position of described bank station emission coefficient and fixing test point receiving system is known, and apart from closer (being less than 3km), the position of mobile test point receiving system is measured by RTK and is obtained, bank station emission coefficient produce and emissioning testing signal, it by sending and receiving end altogether depending on time service GPS, high-precise synchronization atomic clock, digital intermediate frequency measuring signal generator, D/A conversion module and up-converter module form, test signal is not containing textual information, and it uses M sequence modulated carrier, and modulation system is BPSK modulation, and the PPS pulse signal of the time service GPS that sending and receiving end is looked altogether triggers the reference position of M sequence, finds range in this, as time marking, fixing test point receiving system is identical with the structure of mobile test point receiving system, all by down conversion module, AD conversion module, altogether depending on time service GPS, high-precise synchronization atomic clock and digital medium-frequency signal processor form, digital medium-frequency signal processor comprises carrier wave strip module, M sequence generation module, delays time to control module, time delay module, computing module and processor module, receiving system and in sending and receiving end altogether depending on time service GPS and high-precise synchronization atomic clock enable receiver obtain the information and synchronous receiving time information launch time of signal, computing module carries out the integration accumulating operation that is multiplied, Bing Jiangge road correlated results is given processor module and is processed, the result of process is for controlling delays time to control module, it adjusts the delay value in time delay module, the value of time delay module is the desirable time delay gone out according to sending and receiving end position calculation, on the basis of this initial time delay, the multiple M sequence of the corresponding generation of multiple time delay module, they carry out related operation respectively can obtain multiple correlation, the branch road of wherein maximum related value is selected to carry out the higher time delay of resolution, and value in time delay module is more accurate than the value of time delay module, information launch time of signal just can be obtained by the delay value of maximal correlation branch road.
Concrete treatment step is as follows:
1) bank station constantly produces and emissioning testing signal, and this signal uses M sequence modulated carrier, and modulation system is BPSK modulation, looks the reference position of the 1PPS pulse mark M sequence of time service GPS altogether;
2) Mobile Receiving System is placed on the identical position of fixed reception system, measuring-signal is respectively from bank station to the travel-time of fixed reception system and Mobile Receiving System
with
, both subtract each other the difference of the receive time delay obtaining receiving equipment
;
3) mobile receipts system is placed on other test points in test specification, records the propagation delay of signal from bank station to Mobile Receiving System
,
...,
..., and correspondingly record signal from bank station to the propagation delay of fixed reception system
,
...,
4) measurement data is processed, obtain the additional secondary phase factor of each mobile test point.
Signal can be expressed as shown in formula (1) and formula (2) from bank station to the travel-time of fixed reception system and Mobile Receiving System:
（1）
（2）
Wherein,
for the time delay of the transmitter of bank station transmitting station;
for the time delay of fixing test point receiving system;
for the time delay of mobile test point receiving equipment.Concrete treatment step 2) record
with
, only have last difference in both expressions (1) and formula (2), therefore both subtract each other the difference of the receive time delay that can obtain two receiving equipments
.
Because fixing test point offshore station transmitting station is very near, so
two are negligible, and therefore formula (1) can be expressed as formula (3):
（3）
Formula (2)-(3) can obtain:
（4）
Therefore
（5）
with
can actual measurement obtain,
can calculate to the actual distance of bank station and atmospheric refraction index according to test point,
can calculate to parameters such as the actual distance of bank station and sea water conductivities according to test point, the position of bank station and fixing test point A is accurately known, and the position of mobile test point B can obtain exact position by RTK test.
The invention has the beneficial effects as follows: utilize the present invention can accurately measure the additional secondary phase factor of VHF signal in certain limit, for the ASF database setting up VHF signal provides measured data.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the measuring system of VHF signal additional secondary phase factor of the present invention;
Fig. 2 is the structured flowchart of bank station emission coefficient of the present invention.
Fig. 3 is the structured flowchart of test point receiving system of the present invention.
Reference numeral is as follows: 1, bank station emission coefficient, 2, fixing test point receiving system, 3, mobile test point receiving system, 4, the time service GPS that sending and receiving end is looked altogether, 5, high-precise synchronization atomic clock, 6, digital intermediate frequency measuring signal generator, 7, D/A conversion module, 8, up-converter module, 9, down conversion module, 10, AD conversion module, 11, digital medium-frequency signal processor, 12, carrier wave strip module, 13, M sequence generation module, 14, delays time to control module, 15, first time delay module, 16, second time delay module, 17, 3rd time delay module, 18, computing module, 19, processor module.
Embodiment
Below in conjunction with example, the present invention will be further described.
Embodiment one:
(1) bank station sends signal
The position selecting bank station is north latitude 38
°48.23 ', east longitude 121
°38.52 ', the position of fixing test point is north latitude 38
°47.86 ', east longitude 121
°38.34 ', and respectively bank station emission coefficient and receiving system equipment are installed.Bank station transmits as the signal of BPSK modulation, and it is with the carrier wave of M sequence modulation 162.125MHz, not containing textual information.The cycle of M sequence is 63, and primitive polynomial is
, bit rate is 9576 bits/s, comprises 152 M sequence p.s..
(2) fixing test point Received signal strength measurement equipment time delay
Mobile Receiving System is placed on the position that fixed reception system is almost identical, point of fixity receiving equipment records signal propagation delay
=3084250ns, transfer point receiving equipment records signal propagation delay
=3084230ns, both subtract each other the difference of the receive time delay obtaining receiving equipment
=20ns.
(3) mobile test point Received signal strength surveys secondary phase factor
Mobile Receiving System is placed on north latitude 38
°47.56 ', east longitude 121
°32.21 ', record signal propagation delay
=34573780ns, meanwhile, point of fixity receiving equipment records signal propagation delay
=3084470ns, can calculate the additional secondary phase factor of this mobile test point according to formula (5)
=1460ns.Mobile Receiving System is placed on other positions, can uses the same method and obtain the value of its additional secondary phase factor.
Claims (2)
1. the measuring system of a VHF signal additional secondary phase factor, it is characterized in that: comprise bank station emission coefficient, fixing test point receiving system and mobile test point receiving system, the position of described bank station emission coefficient and fixing test point receiving system is known, and distance is less than 3km, the position of mobile test point receiving system is measured by RTK and is obtained, bank station emission coefficient produce and emissioning testing signal, it by sending and receiving end altogether depending on time service GPS receiver, high-precise synchronization atomic clock, digital intermediate frequency measuring signal generator, D/A conversion module and up-converter module form, test signal is not containing textual information, and it uses M sequence modulated carrier, and modulation system is BPSK modulation, and the PPS pulse signal of the time service GPS receiver that sending and receiving end is looked altogether triggers the reference position of M sequence, finds range in this, as time marking, fixing test point receiving system is identical with the structure of mobile test point receiving system, all by down conversion module, AD modular converter, altogether depending on time service GPS receiver, high-precise synchronization atomic clock and digital medium-frequency signal processor form, digital medium-frequency signal processor comprises carrier wave strip module, M sequence generation module, delays time to control module, time delay module, computing module and processor module, receiving system and in sending and receiving end altogether depending on time service GPS receiver and high-precise synchronization atomic clock enable receiver obtain the information and synchronous receiving time information launch time of signal, computing module carries out the integration accumulating operation that is multiplied, Bing Jiangge road correlated results is given processor module and is processed, the result of process is for controlling delays time to control module, it adjusts the delay value in time delay module, the value of time delay module is the desirable time delay gone out according to sending and receiving end position calculation, on the basis of this initial time delay, the multiple M sequence of the corresponding generation of multiple time delay module, they carry out related operation respectively can obtain multiple correlation, the branch road of wherein maximum related value is selected to carry out the higher time delay of resolution, and value in time delay module is more accurate than the value of time delay module, information launch time of signal just can be obtained by the delay value of maximal correlation branch road.
2. be applied to the method for the measuring system of a kind of VHF signal additional secondary phase factor according to claim 1, it is characterized in that the concrete treatment step of this system is as follows:
1) bank station constantly produces and emissioning testing signal, and this signal is that modulation system is BPSK modulation, looks the reference position of the 1PPS pulse mark M sequence of time service GPS receiver altogether with M sequence modulation carrier wave;
2) Mobile Receiving System is placed on the identical position of fixed reception system, measuring-signal is respectively from bank station to the travel-time of fixed reception system and Mobile Receiving System
with
, both subtract each other the difference of the receive time delay obtaining receiving equipment
;
3) Mobile Receiving System is placed on the test point in test specification, records the propagation delay of signal from bank station to Mobile Receiving System
,
...,
..., and correspondingly record signal from bank station to the propagation delay of fixed reception system
,
...,
4) measurement data is processed, obtain the additional secondary phase factor of each mobile test point.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11818594B2 (en) * | 2020-07-15 | 2023-11-14 | Transport Planning and Research Institute Ministry of Transport | Method and system for testing coverage effect of very high frequency communication base station |
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| CN109951410A (en) * | 2019-02-19 | 2019-06-28 | 大连海事大学 | A kind of Holographic test system of AIS live signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2373117A (en) * | 2000-10-04 | 2002-09-11 | Intelligent Tech Int Inc | Mapping road edges; collision avoidance |
| CN1696734A (en) * | 2004-05-13 | 2005-11-16 | 三菱电机株式会社 | Determination of time-difference of arrival and angle of arrival |
| CN101194182A (en) * | 2005-06-08 | 2008-06-04 | 麻省理工学院 | Continuous, continental-shelf-scale monitoring of fish populations and behavior |
-
2013
- 2013-08-22 CN CN201310368437.6A patent/CN103439687B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2373117A (en) * | 2000-10-04 | 2002-09-11 | Intelligent Tech Int Inc | Mapping road edges; collision avoidance |
| CN1696734A (en) * | 2004-05-13 | 2005-11-16 | 三菱电机株式会社 | Determination of time-difference of arrival and angle of arrival |
| CN101194182A (en) * | 2005-06-08 | 2008-06-04 | 麻省理工学院 | Continuous, continental-shelf-scale monitoring of fish populations and behavior |
Non-Patent Citations (1)
| Title |
|---|
| 分布式多载舰地波超视距雷达阵列与信号重构技术研究;李博;《中国博士学位论文全文数据库》;20110415;全文 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11818594B2 (en) * | 2020-07-15 | 2023-11-14 | Transport Planning and Research Institute Ministry of Transport | Method and system for testing coverage effect of very high frequency communication base station |
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