CN101943756A - GPS signal interference method - Google Patents
GPS signal interference method Download PDFInfo
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- CN101943756A CN101943756A CN 201010254023 CN201010254023A CN101943756A CN 101943756 A CN101943756 A CN 101943756A CN 201010254023 CN201010254023 CN 201010254023 CN 201010254023 A CN201010254023 A CN 201010254023A CN 101943756 A CN101943756 A CN 101943756A
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Abstract
The invention discloses a GPS signal interference method, belonging to the technical field of safety. The GPS signal interference method comprises the following steps: adopting a frequency mixing mode to convert a GPS signal on a target position into a signal with frequency easy to transmit; relaying the signal to a position far away from the target position; finally, reducing the original GPS signal; and utilizing the same downlink frequency of the satellite to send out at large power. The GPS signal interference method utilizes the communication relay principle to release researchers from decoding dense fog, and is simple and efficient.
Description
Technical field
The invention belongs to the safety technique field, be specifically related to a kind of gps signal interference method.
Background technology
GPS emission dual-frequency navigation signal, the emission double frequency is in order to proofread and correct the additional delay that ionosphere produces.Wherein L1 is 1575.42 megahertzes, modulates P (Y) sign indicating number and C/A sign indicating number respectively with orthogonal manner, and promptly on 1227.60 megahertzes, has only modulated P (Y) yard at L2 at present; P coded signal bearing accuracy height, good confidentiality is only used for U.S. army and authorized user, but the equation of establishment P sign indicating number is open, and the U.S. has implemented to select feasibility (A-S) policy, and the P code encryption is compiled into the Y sign indicating number.Minimum signal power when the signal of gps satellite emission arrives ground is respectively-160 dBw (dBW, with 1 watt is the zero level decibel) (C/A sign indicating number) ,-163 dBws (L1P sign indicating number) and-166 dBws (L2P sign indicating number), because the influence of various factors, the maximum signal level of above signal does not exceed-153 dBws ,-155 dBws and-158 dBws respectively.Because the signal transmission power of gps satellite can not be very big, satellite is (20200 kilometers) far away again apart from ground, it is very weak when signal arrives ground that (minimum signal level that the L1 signal of 1575.42 megahertzes arrives ground is-160 dBws, 1227.6 it is-166 dBws that the L2 signal of megahertz arrives the minimum signal level on ground, these all are quite low power levels; The light that one 25 watts bulb sent outside sort signal intensity was equivalent to 1.6 ten thousand kilometers, in other words, its power more received than TV set aerial hangs down 1,000,000,000 times), therefore be easy to disturbed.The anti-jamming margin of adding designed gps signal is also little, though the processing gain such as the C/A sign indicating number is 43 decibels, but the bit rate of C/A sign indicating number is 1.023 mbit/bps), 1023 the most of sign indicating numbers, only 1 millisecond of cycle, can only obtain 30 decibels processing gain by despreading, 13 decibel gains in addition are that the accumulation by 20 relevant peaks forms, so the processing gain of whole loop can be above 43 decibels.The signal to noise ratio (S/N ratio) that all can require receiving cable generally speaking is greater than 10 decibels of ability operate as normal, and the rent of receiver closes loss usually all greater than 1 decibel.According to design, the anti-jamming margin of C/A sign indicating number receiver should be commonly considered as 25 decibels below 30 decibels; The processing gain of P sign indicating number is 53 decibels, and anti-jamming margin should be about 43 decibels.Secondly, even for military P code GPS signals, its easily disturbing property also can not underestimate.This mainly is because military P sign indicating number receiver must be realized by civilian C/A sign indicating number synchronously.So in case before military P sign indicating number GPS receiver is realized synchronously civilian C/A coded signal is disturbed, then military P sign indicating number GPS receiver also can't obtain accurate position data.
At present popular a kind of conflicting mode is frequency output high-decibel (＞43db) the noise at above-mentioned two wave bands, developed country is just attempting to use decoding technique to produce simulate signal, the normal reception that mainly is to suppress or cheat the GPS receiver of these methods, thus reach the purpose that the GPS guided weapon can't be hit.Britain expert's experimental data proves, the use jamming power is 1 watt a jammer, implementing FM noise on 1.6 gigahertz (GHZ) frequency bands of gps system disturbs, GPS receiver in 22 kilometer range can not be worked, 6 decibels of the every increases of the Effective Radiated Power of jamming transmitter, effectively interference distance just can increase by 1 times.
Summary of the invention
The present invention aims to provide and a kind ofly need not to decode, the technical scheme of advantages of simplicity and high efficiency gps signal interference method.
Described a kind of gps signal interference method, may further comprise the steps: the mode of utilization mixing earlier becomes the gps signal of target location into the frequency that is easy to transmit, again with this signal relay to away from the place of above-mentioned target location, at last, restore original gps signal, and use the identical downstream frequency of its satellite to broadcast away with high-power.
Described a kind of gps signal interference method, wherein, described trunking scheme wireless station, cable network or civilian mobile communication network.
Described gps signal interference method, utilization communication repeating principle, the researchist is freed from the dense fog of decoding, the downstream frequency of GPRS gps satellite, with the target position information mixing, relay to other position, and use the identical downstream frequency of gps satellite to broadcast away with high-power, thus reach the purpose of interference, deception, simple efficient.
Description of drawings
Fig. 1 is the process flow diagram of wireless high frequency camera shooting interference method of the present invention.
Embodiment
Now, describe preferred embodiment of the present invention in detail in conjunction with Figure of description.
Referring to a kind of gps signal interference method shown in Figure 1, may further comprise the steps: the mode of utilization mixing earlier becomes the gps signal of target location into the frequency that is easy to transmit, again this signal is relayed to place away from above-mentioned target location by wireless station, cable network or civilian mobile communication network, at last, restore original gps signal, and use the identical downstream frequency of its satellite to broadcast away with high-power; Thereby reach the purpose of disturbing gps signal.
Claims (2)
1. gps signal interference method is characterized in that may further comprise the steps:
The mode of utilization mixing earlier becomes the gps signal of target location into the frequency that is easy to transmit, again with this signal relay to away from the place of above-mentioned target location, at last, restore original gps signal, and use the identical downstream frequency of its satellite to broadcast away with high-power.
2. a kind of gps signal interference method as claimed in claim 1 is characterized in that: described trunking scheme wireless station, cable network or civilian mobile communication network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010254023 CN101943756A (en) | 2010-08-13 | 2010-08-13 | GPS signal interference method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010254023 CN101943756A (en) | 2010-08-13 | 2010-08-13 | GPS signal interference method |
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| CN101943756A true CN101943756A (en) | 2011-01-12 |
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| CN 201010254023 Pending CN101943756A (en) | 2010-08-13 | 2010-08-13 | GPS signal interference method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315895A (en) * | 2011-07-13 | 2012-01-11 | 东南大学 | Design method of L1 carrier frequency GPS (Global Processing System) signal jammer and jammer |
| CN102866406A (en) * | 2012-09-21 | 2013-01-09 | 桂林电子科技大学 | Global position system (GPS) deception jamming method and system |
| CN103064090A (en) * | 2012-12-26 | 2013-04-24 | 电子科技大学 | Anti-interference method |
| CN104678406A (en) * | 2015-02-03 | 2015-06-03 | 芜湖航飞科技股份有限公司 | Repeater deception type GPS (Global Position System) jamming system and jamming method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477190A (en) * | 2009-01-22 | 2009-07-08 | 浙江新涛电子机械股份有限公司 | GPS message retransmission unit |
-
2010
- 2010-08-13 CN CN 201010254023 patent/CN101943756A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477190A (en) * | 2009-01-22 | 2009-07-08 | 浙江新涛电子机械股份有限公司 | GPS message retransmission unit |
Non-Patent Citations (1)
| Title |
|---|
| 《航天电子对抗》 20051231 戎建刚等 GPS接收机的相干干扰 第14页 1-2 第21卷, 第6期 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315895A (en) * | 2011-07-13 | 2012-01-11 | 东南大学 | Design method of L1 carrier frequency GPS (Global Processing System) signal jammer and jammer |
| CN102315895B (en) * | 2011-07-13 | 2014-05-28 | 东南大学 | Design method of L1 carrier frequency GPS (Global Processing System) signal jammer and jammer |
| CN102866406A (en) * | 2012-09-21 | 2013-01-09 | 桂林电子科技大学 | Global position system (GPS) deception jamming method and system |
| CN102866406B (en) * | 2012-09-21 | 2014-04-30 | 桂林电子科技大学 | Global position system (GPS) deception jamming method and system |
| CN103064090A (en) * | 2012-12-26 | 2013-04-24 | 电子科技大学 | Anti-interference method |
| CN104678406A (en) * | 2015-02-03 | 2015-06-03 | 芜湖航飞科技股份有限公司 | Repeater deception type GPS (Global Position System) jamming system and jamming method thereof |
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Application publication date: 20110112 |