CN1988409A - Movable double channel radio monitoring and relative interference direction testing system - Google Patents
Movable double channel radio monitoring and relative interference direction testing system Download PDFInfo
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- CN1988409A CN1988409A CNA200610088301XA CN200610088301A CN1988409A CN 1988409 A CN1988409 A CN 1988409A CN A200610088301X A CNA200610088301X A CN A200610088301XA CN 200610088301 A CN200610088301 A CN 200610088301A CN 1988409 A CN1988409 A CN 1988409A
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Abstract
This invention relates to a movable dual channel radio monitor and related interference direction finding system including a movable vertical polarized related interferometer direction finding antenna array, high and low ends rotation switches, an antenna selector, a three-function RF amplifier, a dual channel monitor direction receiver, a monitor direction controller, an industrial control computer, a low end vertical polarized monitor antenna, a high end vertical polarized monitor antenna, a monitor/direction finding selector, a GPS, an electronic compass, an UPS, an environment moinitor and remote control supply unit and a concentrator, which is advantaged that the mutual couple and fuzzy phase among antenna arrays are overcome by applying large aperture active/passive movable direction finding antenna array, and a pair of antenna elements sample at the same time so as to secure synchronous, quick and accurate and the system has three functions of amplification, direct pass and attenuation.
Description
Technical field
But what the present invention relates to is double channel radio monitoring and correlation interference direction-finding system, belongs to the array signal digital processing direction finding technology field in the communication technology.
Background technology
In the reality, a fixed monitoring station direction finding precision height, but it needs the mounting platform (as high building, iron tower) of certain scale, and fixed station equipment (comprising antenna, rack etc.) is all heavier; And mobile radio station mobility is better, and just performance is more lower slightly than fixed station.In view of the above, marginal configuration moved station simple, maneuverability becomes a big demand.
Summary of the invention
The objective of the invention is at the characteristics of demand that occurs in the practical work, but double channel radio monitoring and correlation interference direction-finding system are proposed, outfit can be moved formula perpendicular polarization correlation interferometer direction-finding antenna array, in light weight, move conveniently, system both can be installed on high building or the iron tower as fixed station, also can be flexible as mobile radio station.Adopt a kind of double-channel monitoring and direction-finding receiver, cooperate double-channel correlation interferometer direction-finding system, system still can carry out the double-channel correlation interferometer direction-finding when the needs direction finding, when not needing direction finding, then transfer radio monitoring to.
Technical solution of the present invention: its structure is to comprise moving perpendicular polarization correlation interferometer direction-finding antenna array, high and low end electricity outward winding pass, first antenna selector, three function RF amplifiers, double-channel monitoring and direction-finding receiver, monitoring and direction-finding controller, industrial control computer, low side perpendicular polarization monitoring aerial, high-end perpendicular polarization monitoring aerial, second antenna selector, monitoring/direction finding selector, GPS, electronic compass, printer, battery pack or civil power, UPS, environmental monitoring and remote circuit unit, hub.
Annexation between them: can move the output of perpendicular polarization correlation interferometer direction-finding antenna array and the high and low end electricity first input end that closes of outwarding winding and join, the outward winding output that closes and the first input end of first antenna selector of high and low end electricity joins, the first input end of first output of first antenna selector and three function RF amplifiers joins, and the first input end of the output of three function RF amplifiers and double-channel monitoring and direction-finding receiver joins; First, second, third of industrial control computer exports/go into end respectively with the input of the input of monitoring and direction-finding controller/go out end, double-channel monitoring and direction-finding receiver/go out first of end, hub to import/go out to hold corresponding joining; The first, second, third, fourth, the 5th, the 6th output of monitoring and direction-finding controller is outwarded winding second input that closes, second input of first antenna selector, second input of three function RF amplifiers, second input of double-channel monitoring and direction-finding receiver, the 3rd input of second antenna selector, corresponding the joining of second input of monitoring/direction finding selector with high and low end electricity respectively; Corresponding the joining of the 3rd input of second output of first antenna selector and monitoring/direction finding selector, the output of low side perpendicular polarization monitoring aerial, high-end perpendicular polarization monitoring aerial respectively with corresponding joining of first, second input of second antenna selector, corresponding the joining of first input end of the output of second antenna selector and monitoring/direction finding selector; Corresponding the joining of first, second input of the output of GPS, electronic compass and industrial control computer, industrial control computer the 3rd, corresponding joining of output of four-input terminal and UPS first output, environmental monitoring and remote circuit unit, the output termination printer of industrial control computer, the input of UPS second output and environmental monitoring and remote circuit unit joins, and the output of end and environmental monitoring and remote circuit unit/go into to hold corresponding joining is imported/gone out to second of hub.
Described monitoring and direction-finding receiver is used for radio monitoring and double-channel correlation interferometer direction-finding, but radio monitoring and direction finding are carried out in timesharing.
Advantage of the present invention: adopt the heavy caliber active/passive can move the formula direction estimation antenna array, solved the mutual coupling problem between each bay well, got rid of coupling and phase ambiguity between element antenna.Adopt the correlation interferometer direction-finding system, a pair of antenna element is sampled simultaneously, guarantees synchronous, quick, accurate.Adopted have amplification, the amplifier of straight-through, three kinds of functions of decay, can automatically switch, enlarged the dynamic application scope of received signal, particularly when receiving strong signal, be not easy to produce obstruction because of signal is saturated.Adopt double-channel monitoring and direction-finding receiver, monitoring and direction finding can be carried out in timesharing, when not needing direction finding, can transfer radio monitoring to.System accuracy height, sensitivity are good, little in light weight, the maneuverability of volume, move conveniently.
Description of drawings
Accompanying drawing 1 is an embodiment of the invention electricity theory diagram.
Accompanying drawing 2 high and low end electricity are outwarded winding and are closed electric theory diagram (outward winding with one group of electricity to close be example).
Accompanying drawing 3 is structured flowcharts of environmental monitoring and remote circuit unit.
Accompanying drawing 4 is to move used direction estimation antenna array schematic diagram in station perpendicular polarization multi-channel radio monitoring and the correlation interferometer direction-finding system.
Accompanying drawing 5 is software control system flow charts of the present invention.
Among the figure 1 can move perpendicular polarization correlation interferometer direction-finding antenna array, and the 2nd, high, the low side electricity pass of outwarding winding, 3 is first antenna selectors, 4 is three function RF amplifiers, the 5th, double-channel monitoring and direction-finding receiver, the 6th, the monitoring and direction-finding controller, the 7th, industrial control computer, the 8th, low side perpendicular polarization monitoring aerial, the 9th, high-end perpendicular polarization monitoring aerial, 10 is second antenna selectors, the 11st, monitoring/direction finding selector, the 12nd, GPS, the 13rd, electronic compass, the 14th, printer, the 15th, battery pack or civil power, the 16th, UPS, the 17th, environmental monitoring and remote circuit unit, the 18th, hub.19 lightning rods, 20 5 unit perpendicular polarization passive direction finding antenna array: 1350MHz-3000MHz, 21 5 unit perpendicular polarization passive direction finding antenna array: 500MHz-1350MHz, the active direction estimation antenna array of 22 5 unit perpendicular polarizations: 20MHz-500MHz, R
1, R
2, R
3Be resistance, C
1, C
2, C
3Be electric capacity, D
1-12Be that diode, V1-V7 are the voltage of monitoring and direction-finding controller output; , software control system flow chart comprise monitoring and direction-finding service routine (dfNetServer) direction finding flow process and monitoring and direction-finding service routine (dfNetServer) operational process.
Embodiment
Annexation between them: can move the output of perpendicular polarization correlation interferometer direction-finding antenna array 1 and high and low end electricity and outward winding and close 2 first input end and join, high and low end electricity is outwarded winding and is closed 2 output and the first input end of first antenna selector 3 joins, the first input end of first output of first antenna selector 3 and three function RF amplifiers 4 joins, and the first input end of the output of three function RF amplifiers 4 and double-channel monitoring and direction-finding receiver 5 joins; First, second, third of industrial control computer 7 exports/go into end respectively with the input of the input of monitoring and direction-finding controller 6/go out end, double-channel monitoring and direction-finding receiver 5/go out first of end, hub 18 to import/go out to hold corresponding joining; The first, second, third, fourth, the 5th, the 6th output of monitoring and direction-finding controller 6 is outwarded winding with high and low end electricity respectively and is closed 2 second input, second input of first antenna selector 3, second input of three function RF amplifiers 4, second input of double-channel monitoring and direction-finding receiver 5, the 3rd input of second antenna selector 10, corresponding the joining of second input of monitoring/direction finding selector 11; Corresponding the joining of the 3rd input of second output of first antenna selector 3 and monitoring/direction finding selector 11, the output of low side perpendicular polarization monitoring aerial 8, high-end perpendicular polarization monitoring aerial 9 respectively with corresponding joining of first, second input of second antenna selector 10, corresponding the joining of first input end of the output of second antenna selector 10 and monitoring/direction finding selector 11; Corresponding the joining of first, second input of the output of GPS12, electronic compass 13 and industrial control computer 7, industrial control computer 7 the 3rd, corresponding joining of output of four-input terminal and UPS16 first output, environmental monitoring and remote circuit unit 17, the output termination printer 14 of industrial control computer 7, the input of UPS16 second output and environmental monitoring and remote circuit unit 17 joins, and the output of end and environmental monitoring and remote circuit unit 17/go into to hold corresponding joining is imported/gone out to second of hub 18.
The described perpendicular polarization correlation interferometer direction-finding antenna array 1 of moving is divided into three layers of arrangement (corresponding three frequency ranges), arranges along short transverse.Undermost antenna circle battle array is made up of five pairs of active Vertically Polarized Dipoles (diameter 16mm), and working frequency range is 20MHz～500MHz, and array diameter 1200mm, unit dipole length are 800mm; Middle one deck antenna array is made up of five pairs of passive Vertically Polarized Dipoles (diameter 16mm), and working frequency range is 500MHz～1350MHz, and array diameter 359mm, unit dipole length are 220mm; The upper strata antenna array is made up of five pairs of passive Vertically Polarized Dipoles (diameter 17mm), and working frequency range is 1350MHz～3000MHz, and array diameter 287mm, unit dipole length are 125mm.Lightning rod (long 775mm) is installed topmost, the antenna total height is 2115mm, and impedance is 50 Ω, and interface is a N type socket.
High and low end electricity is outwarded winding, and to close 2 be to be divided into the low side electricity according to frequency range to outward winding and close unit and the high-end electricity unit, pass of outwarding winding.It is subjected to the control and the power supply of monitoring and direction-finding controller.Its low and middle-end electricity operating frequency of closing the unit of outwarding winding is 20MHz～1350MHz, and inside comprises that ANS017L low side electricity is outwarded winding and closes and ALL050L (1: 2+1: 5) power divider.It is equivalent to a high frequency electronic switch, it has 10 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part and 1 self-correcting signal output part, its controlled certain two paths of signals passage (being divided into main road, bypass) and self-correcting signalling channel of getting through simultaneously.The ALL050L power divider is that the self-correcting signal is divided into two-way earlier, and wherein one the tunnel is divided into 5 the tunnel again, introduces the low side electricity pass of outwarding winding, and is used for the system of 20MHz～500MHz ripple or 500MHz～1350MHz wave band work is carried out self-correcting; Another road self-correcting signal is sent to high-end electricity and revolves in the switch enclosure, again behind 1: 5 power divider, delivers to high-frequency electrical and outwards winding and close the self-correcting that the unit is used for the high band system.The high-end electricity operating frequency of closing the unit of outwarding winding is 1350MHz～3000MHz, and inside comprises that the high-end electricity of ANS018L is outwarded winding and closes and 1: 5 power divider of ALL051L.It also is a high frequency electronic switch, and it has 5 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part, its controlled certain two paths of signals passage (being divided into main road, bypass) and self-correcting signalling channel of getting through simultaneously.
When control voltage V1, V2 power up diode D
1-3During conducting, just can pass to node A, when control voltage V2, V3 power up diode D from the signal that can move perpendicular polarization correlation interferometer direction-finding antenna array 1
4-6During conducting, the self-correcting signal just can pass to node A, when control voltage V4, V5 power up diode D
7-9During conducting, the signal of node A just can be exported from main road; When control voltage V6, V7 power up diode D
10-12During conducting, the signal of node A just can be exported from auxiliary route; As shown in Figure 2.
Three function RF amplifiers 4, operating frequency is 20MHz～3000MHz, has amplification, straight-through, three kinds of functions of decay, in use according to actual needs by software set.To handling from the main path signal of first antenna selector.It has 1 control/feeder ear, 1 input, 1 output.
This three function amplifier is made up of first high frequency relay, second high frequency relay, amplifying circuit, attenuator circuit and power supply, the amplifier tube (model ERA-51SM) in high frequency relay (model RF303-12), the amplifier.+ 12V power supply is added to respectively on first high frequency relay and second high frequency relay by software control.When first high frequency relay powers up, and second high frequency relay is not when powering up, and input signal obtains linear amplification behind amplifying circuit, again the second straight-through part output through high frequency relay.Be " amplification ".When first high frequency relay does not power up, and second high frequency relay is when powering up, and input signal arrives the attenuator circuit of second high frequency relay after the straight-through part of first high frequency relay, output after decaying.Be " decay ".When first high frequency relay and second high frequency relay did not power up, input signal was through the straight-through part output of first high frequency relay and second high frequency relay.Be " leading directly to ".So this amplifier has " lead directly to, amplify, decay " three functions.
Double-channel monitoring and direction-finding receiver 5 has monitoring and direction finding dual-use function.When the needs direction finding, two channels are worked simultaneously, to carrying out frequency conversion, demodulation, decoding from the main path signal of three function amplifiers 4 with from the bypass signal of monitoring/direction finding selector, output comprises the analog or digital signal of information such as signal frequency, amplitude, frequency deviation, percentage modulation bandwidth, level, phase difference, deliver to industrial control computer again and handle, it is by RS232 and computer communication.When not needing direction finding, one of them channel promptly transfers monitoring to and uses, monitoring aerial signal from monitoring/direction finding selector is handled (can monitor measurement to the signal of different frequency domains, modulation domain, time domain), and output comprises information such as signal frequency, amplitude, frequency deviation, percentage modulation bandwidth, level, spectral image.Select the RR510A double-channel monitoring and direction-finding receiver of Japanese Anritsu company in the present embodiment for use.Its local vibration source of two channel sharings, phase equalization is good, thereby has guaranteed the high accuracy of correlation interferometer direction-finding system, and system sensitivity is very high, reliable and stable.
Monitoring and direction-finding controller 6 (model is DFC050L) is system's each several part control drive unit and dc power supply unit.Controller is by serial port and industrial control computer (ADVANTECH IPC-610) communication, accept the control command of computer, outward winding pass, first selector, three function RF amplifiers, monitoring and direction-finding receiver, second antenna selector, monitoring/direction finding selector etc. of high and low end electricity controlled, system is monitored and direction finding radio signal according to software program.
Industrial control computer 7 (ADVANTECH IPC-610) is the carrier as application software, except executive program (comprise storage, print), also lot of data, audio frequency, video etc. are handled, it is by carrying out complicated statistic algorithm (as auto-correlation algorithm, phase detection algorithm, HILBERT conversion, fft algorithm) to the information data of a large amount of collections, thereby draws the orientation of signal.It has that the speed of service is fast, capacity is big, reliable and stable, can expand, characteristics such as anti-seismic performance is good.
Low side perpendicular polarization monitoring aerial 8, operating frequency are 20MHz～700MHz, are the passive omnidirectional antenna of direction-free bipyramid (waiting awl) in horizontal plane, and antenna size is: diameter 1732mm; Height 1223mm.Input impedance: 50 Ω, the interface pattern is a N type socket.
High-end perpendicular polarization monitoring aerial 9, operating frequency are 500MHz～3000MHz, are the passive omnidirectional antenna of direction-free bipyramid (waiting awl) in horizontal plane, and antenna size is: diameter 250mm; Height 370mm.Input impedance: 50 Ω, the interface pattern is a N type socket.
Monitoring/direction finding selector 11, also be a kind of 2: 1 selectors, it is therefrom chosen 1 road signal (monitoring or direction-finding signal) and sends in the double-channel monitoring and direction-finding receiver selecting from the direction finding bypass signal of first antenna selector with from the monitoring aerial signal of second antenna selector.It has 2 signal input parts, 1 signal output part, 1 control end.
GPS12 is global positioning system (Global Positioning System), and it is made up of Aerospace Satellite, ground monitoring and subscriber equipment three parts, is widely used in all kinds of navigation positioning systems.The GPS receiver is an equipment that receives gps satellite signal and calculate the present position coordinate in real time.GPS is used for the monitoring station, and its purposes is to determine the geographical position at this station (warp, latitude) at any time, and data are offered computer.On electronic chart, show current location in real time, simultaneously for showing that direction-finding bearing and cross bearing provide data.
Native system adopts GPS12XL (jaguar) the GPS receiver of U.S. GARMIN company.GPS12XL adopts parallel 12 passages to receive system, and is highly sensitive.
Battery pack or civil power 15 comprise civil power 220VAC and batteries (4 joint 12V100AH).
UPS16 is a uninterrupted power supply, and model is that APC1000VA is online.
Environmental monitoring and remote circuit unit 17, it (accepts control command to the system equipment power-on and power-off by the remote switch control module, computer resets, starting of air conditioner etc. are controlled), (AD that is used for on-the-spot 220VAC gathers data acquisition unit, fetch equipment power-on and power-off situation and voltage data etc.), (model is DS-6001HC to network video server, be used to transmit image scene), colour imagery shot (model is a Samsung 101), voltage sensor (model is DYH28-14A, is used for the 220V alternating current is converted into the alternating current of 5V), Temperature Humidity Sensor (model is JWSL-3W), smoke alarm (model is BT-168A), Infrared intrusion detector (model is BT-922R) etc. are partly formed.It links by NJ45 interface and hub, and hub joins with network again.Under control centre's software (DESCO DF7.0) effect, can carry out straighforward operation to long-range fixed station, comprise switching on and shutting down, receive that control centre's instruction is monitored, monitored, recording, direction finding or the location that crosses, and will monitor monitoring direction finding result and pass back to control centre.In addition, operating state, equipment connection status, the ambient condition of distant station are monitored, and by transmission link with Monitoring Data such as environment, operating states with by camera the image of telemonitoring is delivered to control centre and monitor.To in time report to the police if any unusual (containing theft, fire alarm etc.).
Claims (8)
- But 1 double channel radio monitoring and correlation interference direction-finding system, it is characterized in that moving the output of perpendicular polarization correlation interferometer direction-finding antenna array and the high and low end electricity first input end that closes of outwarding winding joins, the outward winding output that closes and the first input end of first antenna selector of high and low end electricity joins, the first input end of first output of first antenna selector and three function RF amplifiers joins, and the first input end of the output of three function RF amplifiers and double-channel monitoring and direction-finding receiver joins; First, second, third of industrial control computer exports/go into end respectively with the input of the input of monitoring and direction-finding controller/go out end, double-channel monitoring and direction-finding receiver/go out first of end, hub to import/go out to hold corresponding joining; The first, second, third, fourth, the 5th, the 6th output of monitoring and direction-finding controller is outwarded winding second input that closes, second input of first antenna selector, second input of three function RF amplifiers, second input of double-channel monitoring and direction-finding receiver, the 3rd input of second antenna selector, corresponding the joining of second input of monitoring/direction finding selector with high and low end electricity respectively; Corresponding the joining of the 3rd input of second output of first antenna selector and monitoring/direction finding selector, the output of low side perpendicular polarization monitoring aerial, high-end perpendicular polarization monitoring aerial respectively with corresponding joining of first, second input of second antenna selector, corresponding the joining of first input end of the output of second antenna selector and monitoring/direction finding selector; Corresponding the joining of first, second input of the output of GPS, electronic compass and industrial control computer, industrial control computer the 3rd, corresponding joining of output of four-input terminal and UPS first output, environmental monitoring and remote circuit unit, the output termination printer of industrial control computer, the input of UPS second output and environmental monitoring and remote circuit unit joins, and the output of end and environmental monitoring and remote circuit unit/go into to hold corresponding joining is imported/gone out to second of hub.
- But 2, double channel radio monitoring according to claim 1 and correlation interference direction-finding system, it is characterized in that the described perpendicular polarization correlation interferometer direction-finding antenna array of moving, be divided into three layers of arrangement (corresponding three frequency ranges), arrange along short transverse, undermost antenna circle battle array is made up of five pairs of active Vertically Polarized Dipoles (diameter 16mm), working frequency range is 20MHz～500MHz, and array diameter 1200mm, unit dipole length are 800mm; Middle one deck antenna array is made up of five pairs of passive Vertically Polarized Dipoles (diameter 16mm), and working frequency range is 500MHz～1350MHz, and array diameter 359mm, unit dipole length are 220mm; The upper strata antenna array is made up of five pairs of passive Vertically Polarized Dipoles (diameter 17mm), working frequency range is 1350MHz～3000MHz, array diameter 287mm, the unit dipole length is 125mm, lightning rod (long 775mm) topmost is installed, the antenna total height is 2115mm, and antenna impedance is 50 Ω, and interface is a N type socket.
- 3, but double channel radio monitoring according to claim 1 and correlation interference direction-finding system, it is characterized in that height, the low side electricity is outwarded winding, and to close be to be divided into the low side electricity according to frequency range to outward winding and close unit and the high-end electricity unit, pass of outwarding winding, its low and middle-end electricity operating frequency of closing the unit of outwarding winding is 20MHz～1350MHz, inside comprises that ANS 017L low side electricity is outwarded winding and closes and ALL 050L (1: 2+1: 5) power divider, it is equivalent to a high frequency electronic switch, it has 10 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part and 1 self-correcting signal output part, the high-end electricity operating frequency of closing the unit of outwarding winding is 1350MHz～3000MHz, inside comprises that the high-end electricity of ANS 018L is outwarded winding and closes and 1: 5 power divider of ALL 051L, it also is a high frequency electronic switch, it has 5 signal input parts, 2 signal output parts, 1 control/power supply port, 1 self-correcting signal input part, its controlled certain two paths of signals passage of getting through simultaneously (is divided into main road, bypass) and the self-correcting signalling channel.
- But 4, double channel radio monitoring according to claim 1 and correlation interference direction-finding system, it is characterized in that first antenna selector is 4: 2 selector, be used for outwarding winding and close and the outward winding major-minor signal of 2 couple that closes output of low side electricity is chosen 1 pair of major-minor signal and exported from high-end electricity, it has 4 inputs, 2 outputs and 1 control/feeder ear, export one tunnel main signal to three function RF amplifiers 4, the auxilliary signal in another road is delivered to monitoring/direction finding selector.
- But 5, double channel radio monitoring according to claim 1 and correlation interference direction-finding system is characterized in that three function RF amplifiers, and operating frequency is 20MHz～3000MHz, and it has 1 control/feeder ear, 1 input, 1 output.
- But 6, double channel radio monitoring according to claim 1 and correlation interference direction-finding system, it is characterized in that low side perpendicular polarization monitoring aerial, operating frequency is 20MHz～700MHz, be the passive omnidirectional antenna of direction-free bipyramid (waiting awl) in horizontal plane, antenna size is: diameter 1732mm; Height 1223mm, input impedance: 50 Ω, the interface pattern is a N type socket; High-end perpendicular polarization monitoring aerial, operating frequency are 500MHz～3000MHz, are the passive omnidirectional antenna of direction-free bipyramid (waiting awl) in horizontal plane, and antenna size is: diameter 250mm; Height 370mm, input impedance: 50 Ω, the interface pattern is a N type socket.
- But 7, double channel radio monitoring according to claim 1 and correlation interference direction-finding system, it is characterized in that second antenna selector, be a kind of 2: 1 selectors, it is to selecting from the signal of low side perpendicular polarization monitoring aerial and high-end perpendicular polarization monitoring aerial, therefrom choose 1 road monitor signal and send into monitoring/direction finding selector, it has 2 signal input parts, 1 signal output part, 1 control end.
- But 8, double channel radio monitoring according to claim 1 and correlation interference direction-finding system, it is characterized in that monitoring/direction finding selector, also be a kind of 2: 1 selectors, it is to selecting from the direction finding bypass signal of first antenna selector with from the monitoring aerial signal of second antenna selector, therefrom choose 1 road signal (monitoring or direction-finding signal) and send in the double-channel monitoring and direction-finding receiver, it has 2 signal input parts, 1 signal output part, 1 control end.
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| CNA200610088301XA CN1988409A (en) | 2006-07-10 | 2006-07-10 | Movable double channel radio monitoring and relative interference direction testing system |
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| CNA200610088301XA CN1988409A (en) | 2006-07-10 | 2006-07-10 | Movable double channel radio monitoring and relative interference direction testing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697383B (en) * | 2009-10-27 | 2013-03-20 | 中国海洋石油总公司 | Double tracking satellite antenna system and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697383B (en) * | 2009-10-27 | 2013-03-20 | 中国海洋石油总公司 | Double tracking satellite antenna system and using method thereof |
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Open date: 20070627 |