CN115411520B - Helicopter GPS and Beidou antenna anti-interference device and method - Google Patents
Helicopter GPS and Beidou antenna anti-interference device and method Download PDFInfo
- Publication number
- CN115411520B CN115411520B CN202211222836.7A CN202211222836A CN115411520B CN 115411520 B CN115411520 B CN 115411520B CN 202211222836 A CN202211222836 A CN 202211222836A CN 115411520 B CN115411520 B CN 115411520B
- Authority
- CN
- China
- Prior art keywords
- antenna
- beidou
- gps
- helicopter
- beidou antenna
- Prior art date
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 36
- 239000003381 stabilizer Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000002452 interceptive effect Effects 0.000 claims description 8
- 238000012795 verification Methods 0.000 claims 2
- 238000009434 installation Methods 0.000 description 15
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 14
- 238000013461 design Methods 0.000 description 11
- 230000000903 blocking effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/285—Aircraft wire antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses an anti-interference device and method for a GPS and a Beidou antenna of a helicopter, wherein the interference device comprises the Beidou antenna, the Beidou antenna is arranged on the helicopter, and the Beidou antenna and the GPS antenna of the helicopter keep a reasonable antenna distance, so that an interference field of the Beidou antenna cannot interfere with a receiving signal of the GPS antenna; the relation between the interference field generated by the Beidou antenna and the antenna distance comprises: rss=pt-Lc-lbf+n; lbf=32.5+20lgf+20lgd. According to the invention, the antenna distance of the Beidou antenna, which does not influence the normal operation of the GPS antenna, is researched through theoretical calculation, the selection of proper Beidou antenna mounting points in the limited external space position range of the helicopter is guided, no shielding is needed, the Beidou antenna and the GPS antenna are free from interference, the normal emission of the Beidou antenna, the normal operation of the Beidou antenna and the GPS system are realized, the flight safety requirement of the helicopter is met, the cost and the weight of the Beidou navigation positioning system are effectively reduced, and the feasibility of the scheme is verified through practical application.
Description
Technical Field
The invention belongs to the technical field of navigation, and particularly relates to an anti-interference device and method for a GPS and Beidou antenna of a helicopter.
Background
The China Beidou satellite navigation system (BeiDou Navigation Satellite System, BDS) is a China self-developed global satellite navigation system. Is the third mature satellite navigation system following the united states Global Positioning System (GPS), russian GLONASS satellite navigation system (GLONASS). The Beidou satellite navigation system (BDS) and the United states GPS, russian GLONASS, european Union GALILEO are well-established suppliers by the United nations satellite navigation Committee. The Beidou satellite navigation system consists of an air surface section, a ground section and a user section, can provide high-precision, high-reliability positioning, navigation and time service for various users all around the world, has short message communication capability, and has the regional navigation, positioning and time service capability, the positioning precision is 10 meters, the speed measurement precision is 0.2 meters/second and the time service precision is 10 nanoseconds.
The Beidou equipment uses a receiving and transmitting integrated antenna, and can send the position information of the flight platform to the Beidou communication satellite in a short message (RSMC) form at intervals while receiving the positioning satellite signals, and then the satellite transmits the information to a ground monitoring command base station and finally transmits the information to a ground user. The frequency of the short message transmitted by the Beidou antenna is similar to that of GPS positioning satellite signals, so that the positioning information of an adjacent onboard GPS can be interfered during transmission, and the normal navigation positioning function of a GPS system is finally affected. Meanwhile, if the distance between the Beidou antenna and the transmitting antenna of other airborne communication equipment is too short, positioning information received by the Beidou antenna is also interfered by the airborne communication equipment. Therefore, the installation position of the Beidou antenna also needs to avoid the influence of the medium-high frequency communication antenna above the cockpit of the aircraft.
If the Beidou system does not emit signals, the Beidou and GPS antennas installed on the helicopter respectively receive the positioning information of the respective satellites, and the Beidou and GPS antennas are mutually free from interference. As a user of the helicopter flight platform, the GPS system of original factory equipment is required to be ensured to work normally, and the position of the helicopter in the air is required to be tracked and monitored in real time. Therefore, the big Dipper system is additionally arranged on the helicopter, so that the problem of interference of the big Dipper antenna to the GPS antenna is solved, and the normal operation of the GPS installed in the original factory and the big Dipper short message function are ensured to be realized simultaneously.
GPS receiving antennas are subject to 2 main interferences: stray interference and blocking interference. Wherein the spurious interference is related to the natural frequency characteristic of the GPS antenna, is difficult to avoid by spatial isolation and position adjustment, and is not related to electromagnetic waves emitted by the beidou. The transmitting frequency of the Beidou short message is 1610-1626.5MHz, DSSS+BPSK modulation is adopted, and the Beidou short message is registered as a radio positioning service frequency band, namely an RDSS frequency band in the international electricity. The frequency of the Beidou short message transmitting is not greatly different from the frequency (1575.4 Mhz) of the positioning information received by the GPS antenna, and the influence degree of blocking interference generated by electromagnetic waves transmitted by Beidou on the GPS receiving antenna is related to the position of the Beidou antenna. If the installation position of the Beidou antenna is not proper, larger interference can be generated to the normal operation of the GPS.
At present, most helicopters manufactured at home and abroad adopt GPS navigation positioning, an aircraft manufacturer selects a position with higher position and wide visual field to install a GPS antenna when the helicopter leaves a factory, so that better GPS navigation positioning information is obtained, and a user at the position of the GPS antenna cannot randomly change according to the regulation requirement of civil aviation management departments. The Beidou short message antenna generally adopts a hemispherical radiation upward transmitting mode, and if the space position of the Beidou short message antenna is higher than that of the GPS antenna, the interference of the Beidou short message to the GPS antenna can be reduced to a great extent. However, when the Beidou navigation and positioning system is modified in the later period of the helicopter, the Beidou antenna cannot be mounted at a position higher than the GPS antenna, and the position is more favorable. The general airborne big dipper equipment is all installed in the aircraft nose position, but need carry out complicated electromagnetic shield and handle, its design is more complicated, and the cost is higher.
Disclosure of Invention
The invention aims to provide an anti-interference device and method for a GPS and Beidou antenna of a helicopter, which are used for solving the problems in the prior art.
In order to achieve the above object, on the one hand, the present invention adopts the following technical scheme: the anti-interference device for the GPS and the Beidou antenna of the helicopter comprises the Beidou antenna, wherein the Beidou antenna is arranged on the helicopter, and the Beidou antenna and the GPS antenna of the helicopter keep a reasonable antenna distance, so that an interference field of the Beidou antenna cannot interfere with a receiving signal of the GPS antenna;
the relation between the interference field generated by the Beidou antenna and the antenna distance comprises the following steps:
RSS＝Pt-Lc-Lbf+N
wherein RSS is the intensity of a received signal, pt is the transmitting power of a Beidou antenna, N is the noise of a GPS antenna, lbf is the free space loss of the Beidou antenna interfering signals of the GPS antenna in a transmission path, and Lc is the transmission loss of a cable and a connector.
Lbf＝32.5+20lgF+20lgD
D is the antenna distance between the GPS antenna and the Beidou antenna, and F is the signal frequency of the Beidou antenna.
lg is the base 10 log, lgD log10 (D);
final d=10 (Lbf-32.5)/20 The minimum value of D is thus determined by the free space loss Lbf and the signal frequency F.
As an optional design structure of the technical scheme, when the interference field strength of the Beidou antenna is insufficient to influence the GPS antenna to normally receive satellite signals, the received signal strength RSS generated by the GPS antenna when the GPS antenna receives the Beidou antenna is not more than 8dBm.
As an optional design structure of the technical scheme, the Beidou antenna is arranged on the horizontal stabilizer of the helicopter.
As an optional design structure of above-mentioned technical scheme, big dipper antenna includes first big dipper communication unit and first mount pad, first big dipper communication unit installs on first mount pad, first mount pad is installed on the horizontal stabilizer, and first big dipper communication unit is connected with the inside big dipper host computer of helicopter through first feeder.
As an optional design structure of the technical scheme, the first feeder is led out of the skin of the horizontal stabilizer through the first mounting seat, enters the inside of the tail beam through a gap between the horizontal stabilizer and the tail beam skin, and is paved forwards along a cable channel in the tail beam to be connected to the Beidou host.
As an optional design structure of the technical scheme, the first Beidou communication unit is connected with the first mounting seat and the first mounting seat is connected with the horizontal stabilizer through bolts.
As an optional design structure of the technical scheme, the Beidou antenna is arranged on a tail beam of the helicopter.
As an optional design structure of above-mentioned technical scheme, big dipper antenna includes second big dipper communication unit and second mount pad, second big dipper communication unit installs on the second mount pad, the second mount pad is installed on the tail boom, and second big dipper communication unit passes through the second feeder and is connected with the inside big dipper host computer of helicopter.
As an optional design structure of the technical scheme, the second mounting seat and the tail beam are both provided with wire passing holes, and the second feeder line enters the tail transmission shaft fairing through the wire passing holes of the second mounting seat and enters the tail beam through the wire passing holes of the tail beam, and then is connected to the Beidou host machine in a forward paving mode along a cable channel in the tail beam.
As an optional design structure of the technical scheme, the second installation seat is arc-shaped and sleeved on the tail beam, and the second Beidou communication unit is connected with the second installation seat and the first installation seat is connected with the horizontal stabilizer through bolts.
On the other hand, the invention adopts the following technical scheme: an anti-interference method for a GPS and Beidou antenna of a helicopter comprises the following steps:
step A, obtaining the relation between an interference field generated by a Beidou antenna and the antenna distance;
and B, adjusting the antenna distance between the GPS antenna and the Beidou antenna on the helicopter based on the relation between the interference field generated by the Beidou antenna and the antenna distance, so that the interference field of the Beidou antenna does not interfere with the received signals of the GPS antenna.
The obtaining the relation between the interference field generated by the Beidou antenna and the antenna distance comprises the following steps:
calculating the intensity of a received signal generated by the Beidou antenna received by the GPS antenna,
RSS＝Pt-Lc-Lbf+N
wherein RSS is the intensity of a received signal, pt is the transmitting power of a Beidou antenna, N is the noise of a GPS antenna, lbf is the free space loss of the Beidou antenna in a transmission path for interfering signals of the GPS antenna, and Lc is the transmission loss of a cable and a connector;
Lbf＝32.5+20lgF+20lgD
d is the antenna distance between the GPS antenna and the Beidou antenna, and F is the signal frequency of the Beidou antenna.
The beneficial effects of the invention are as follows:
according to the invention, the antenna distance of the Beidou antenna, which does not influence the normal operation of the GPS antenna, is researched through theoretical calculation, the selection of proper Beidou antenna mounting points in the limited external space position range of the helicopter is guided, no shielding is needed, the Beidou antenna and the GPS antenna are free from interference, the normal emission of the Beidou antenna, the normal operation of the Beidou antenna and the GPS system are realized, the flight safety requirement of the helicopter is met, the cost and the weight of the Beidou navigation positioning system are effectively reduced, and the feasibility of the scheme is verified through practical application.
Drawings
FIG. 1 is a graph of the linear relationship between received signal strength and antenna distance in one embodiment of the invention;
fig. 2 is a schematic perspective view of a beidou antenna in embodiment 1 of the present invention;
fig. 3 is an exploded view of the beidou antenna in embodiment 1 of the present invention;
fig. 4 is a top view of the Beidou antenna of embodiment 1 of the present invention after installation;
fig. 5 is a schematic diagram of a perspective structure of a beidou antenna in embodiment 2 of the present invention;
fig. 6 is a front view of the Beidou antenna of embodiment 2 of the present invention after installation;
fig. 7 is a top view of the beidou antenna in embodiment 2 of the present invention after installation.
Fig. 8 is a diagram of the installation position of the GPS antenna in the embodiment of the present invention.
In the figure: 1-a Beidou antenna; 2-a helicopter; 3-a horizontal stabilizer; 4-a first Beidou communication unit; 5-a first mounting seat; 6-tail beams; 7-a second Beidou communication unit; 8-a second mounting seat; 9-a second feeder; 10-GPS antenna.
Detailed Description
Example 1
As shown in fig. 1-4, the embodiment provides a helicopter GPS and beidou antenna anti-interference device, which comprises a beidou antenna 1, wherein the beidou antenna 1 is arranged on a helicopter 2, and the beidou antenna 1 and a GPS antenna 10 of the helicopter 2 keep a reasonable antenna distance, so that an interference field of the beidou antenna 1 cannot interfere with a received signal of the GPS antenna 10. The Beidou antenna 1 belongs to an additional installation part of the helicopter 2, the GPS antenna 10 belongs to a preset part of the helicopter 2, and the additionally installed Beidou antenna 1 and the preset GPS antenna 10 can work independently at the same time and cannot cause interference with each other.
The relationship between the interference field generated by the Beidou antenna 1 and the antenna distance comprises:
RSS＝Pt-Lc-Lbf+N
the Beidou communication terminal is in a beam width range of a transmitting antenna, and an equivalent omni-directional radiation power (EIRP) value of a transmitting signal is between 33.5dBm and 49 dBm.
RSS is the received signal strength, pt is the transmit power of the beidou antenna 1, here calculated in 49 dBm;
n is GPS antenna 10 noise, here calculated in 3.5 dB;
lbf is the free space loss of the signal of the beidou antenna interfering with the GPS antenna 10 in the transmission path, and Lc is the transmission loss of the cable and the joint.
Lbf＝32.5+20lgF+20lgD
D is the antenna distance between the GPS antenna 10 and the beidou antenna 1, and F is the signal frequency of the beidou antenna 1, here calculated in 1615 (MHz).
lg is the base 10 log, lgD log10 (D);
final d=10 (Lbf-32.5)/20 The minimum value of D is thus determined by the free space loss Lbf and the signal frequency F.
By adopting the calculation mode, a graph between the interference field and the antenna distance can be obtained, and the graph is particularly shown in fig. 1. For the onboard GPS antenna 10, a broadband antenna is generally adopted for compatibility with GLONASS, BD, GPS signals, so that the Beidou short message frequency 1615MHz is not inhibited. For a GPS receiver system, the 1dB compression point (P1 dB) of the LNA is +13dBm. The noise of the GPS receiving antenna is typically 3.5dB, and at least a 5dB margin is required to ensure proper system operation. The interference value generated by the Beidou short message at the central point of the GPS antenna is smaller than 8dBm before LNA amplification. The antenna distance that the Beidou antenna 1 does not affect the normal operation of the GPS antenna 10 is researched through theoretical calculation, and the antenna distance between the GPS antenna 10 and the Beidou antenna 1 is kept above 2.5 m.
Since the position of the GPS antenna 10 on the helicopter 2 cannot be changed randomly, and the position of the helicopter 2 where the beidou antenna 1 can be installed is limited, in order to ensure that the beidou antenna 1 does not affect the normal operation of the GPS antenna 10, as shown in fig. 4, in this embodiment, the beidou antenna 1 is disposed on the horizontal stabilizer 3 of the helicopter 2.
The helicopter 2 is provided with 3 GPS antennas 10, as shown in fig. 8, one GPS antenna 10 is installed on the left side skin of the cabin ceiling, 6M 4 embedded pieces are embedded in the cabin ceiling, and a bracket of the GPS antenna 10 is in threaded connection with the cabin ceiling. 4M 5 supporting plate nuts are arranged on the upper surface of the support of the GPS antenna 10 and are used for fixing the GPS antenna 10. The side of the bracket of the GPS antenna 10 is provided with a cable via hole, and a rubber ring is arranged on the hole for wear prevention. According to the refitting requirement, the original antenna cable via hole is plugged by a cover, the cable via hole phi 30 is opened at the cabin ceiling position right below the support of the GPS antenna 10, and anti-wear treatment is carried out. The cable gets into passenger cabin back edge ceiling and is connected with the mainframe box through the floor through X3205 frame. The other 2 GPS antennas 10 are arranged at the top end of the vertical tail of the helicopter and horizontally arranged. In the detailed design scheme of the helicopter frame, the GPS antenna cable passes through the skin and enters the upper fairing of the vertical stabilizer, the GPS antenna cable is connected to the main cabinet through the built-in cable channel, and the cable wire passing holes are subjected to wear-resistant treatment and meet the electric lap joint requirement, so that redesign and change are not needed.
As shown in fig. 2 and fig. 3, specifically, the beidou antenna 1 includes a first beidou communication unit 4 and a first mounting seat 5, the first mounting seat 5 is rectangular box-shaped, the first beidou communication unit 4 is mounted on the first mounting seat 5, the first mounting seat 5 is mounted on the horizontal stabilizer 3, wherein, bolt connection is all passed through between the first beidou communication unit 4 and the first mounting seat 5 and between the first mounting seat 5 and the horizontal stabilizer 3. The first beidou communication unit 4 is connected with a beidou host machine in the helicopter 2 through a first feeder line, preferably, the first feeder line is led out of the skin of the horizontal stabilizer 3 through a first mounting seat 5, enters the inside of the tail boom 6 through a gap between the skin of the horizontal stabilizer 3 and the skin of the tail boom 6, and is paved forwards along a cable channel in the tail boom 6 to be connected with the beidou host machine.
According to the technical scheme, the Beidou navigation positioning system is additionally arranged on the current AC311A, AC, AC312E, AC312, H125E and other machine types, and according to the test, the Beidou equipment does not increase any shielding at the installation position, has no interference with GPS and other receiving and transmitting equipment, and the onboard GPS and Beidou normal work and Beidou short message communication functions all operate normally, wherein the safety flying is accumulated for more than 2000 hours on the AC311A, AC312E, H, H125E machine types, and the validity of the patent is verified. By the technical scheme, the real-time tracking of the flying position of the helicopter 2 in the air is realized, the control and the allocation of the helicopter 2 flying are facilitated, the flying safety is guaranteed to the maximum extent, the cost and the weight of the Beidou navigation positioning system are effectively reduced, and the beneficial reference and the reference are provided for the Beidou navigation positioning system additionally installed on other models in the later stage.
The embodiment also provides an anti-interference method for the GPS and the Beidou antenna of the helicopter, which is applied to the anti-interference device, and comprises the following steps:
step A, obtaining the relation between an interference field generated by the Beidou antenna 1 and the antenna distance;
and step B, based on the relation between the interference field generated by the Beidou antenna 1 and the antenna distance, adjusting the antenna distance between the GPS antenna 10 and the Beidou antenna 1 on the helicopter 2, so that the interference field of the Beidou antenna 1 does not interfere with the received signals of the GPS antenna 10.
The obtaining the relation between the interference field generated by the Beidou antenna 1 and the antenna distance comprises the following steps:
the intensity of the received signal generated by the GPS antenna 10 receiving the beidou antenna 1 is calculated,
RSS＝Pt-Lc-Lbf+N
wherein RSS is the intensity of a received signal, pt is the transmitting power of the Beidou antenna 1, N is the noise of the GPS antenna, lbf is the free space loss of the signals of the Beidou antenna interfering with the GPS antenna in a transmission path,
Lbf＝32.5+20lgF+20lgD
d is the antenna distance between the GPS antenna 10 and the beidou antenna 1, and F is the signal frequency of the beidou antenna 1.
In order to overcome the influence of blocking interference generated by electromagnetic waves emitted by Beidou on a GPS receiving antenna, the invention provides an anti-interference device and method for a GPS and a Beidou antenna of a helicopter, which solves the problem of late modification of a Beidou system under the condition that the space outside a small and medium-sized helicopter 2 such as AC311A, AC311, AC312E, AC, H125 and the like is limited, and ensures that the GPS and the Beidou system can work normally.
According to the invention, the antenna distance of the Beidou antenna 1, which does not influence the normal operation of the GPS antenna 10, is researched through theoretical calculation, the proper mounting point of the Beidou antenna 1 is selected in the limited external space position range of the helicopter 2, the normal emission of the Beidou antenna 1, the normal operation of Beidou and GPS systems are realized, the flight safety requirement of the helicopter 2 is met, and the feasibility of the scheme is verified through practical application.
Example 2
As shown in fig. 5-7, the embodiment provides a helicopter GPS and beidou antenna anti-interference device, which comprises a beidou antenna 1, wherein the beidou antenna 1 is arranged on a helicopter 2, and the beidou antenna 1 and a GPS antenna 10 of the helicopter 2 keep a reasonable antenna distance, so that an interference field of the beidou antenna 1 cannot interfere with a received signal of the GPS antenna 10. The Beidou antenna 1 belongs to an additional installation part of the helicopter 2, the GPS antenna 10 belongs to a preset part of the helicopter 2, and the additionally installed Beidou antenna 1 and the preset GPS antenna 10 can work independently at the same time and cannot cause interference with each other.
The relationship between the interference field generated by the Beidou antenna 1 and the antenna distance comprises:
RSS＝Pt-Lc-Lbf+N
the EIRP value of the transmitting signal of the Beidou communication terminal is 33.5dBm to 49dBm within the beam width range of the transmitting antenna.
RSS is the received signal strength, pt is the transmit power of the beidou antenna 1, here calculated in 49 dBm;
n is GPS antenna noise, here calculated in 3.5 dB;
lbf is the free space loss in the transmission path of the signal of the beidou antenna interfering with the GPS antenna 10,
Lbf＝32.5+20lgF+20lgD
d is the antenna distance between the GPS antenna 10 and the beidou antenna 1, and F is the signal frequency of the beidou antenna 1, here calculated in 1615 (MHz).
By adopting the calculation mode, a graph between the interference field and the antenna distance can be obtained, and the graph is particularly shown in fig. 1. For the onboard GPS antenna 10, a broadband antenna is generally adopted for compatibility with GLONASS, BD, GPS signals, so that the Beidou short message frequency 1615MHz is not inhibited. For a GPS receiver system, the 1dB compression point (P1 dB) of the LNA is +13dBm. The noise of the GPS receiving antenna is typically 3.5dB, and at least a 5dB margin is required to ensure proper system operation. The interference value generated by the Beidou short message at the central point of the GPS antenna is smaller than 8dBm before LNA amplification. The antenna distance that the Beidou antenna 1 does not affect the normal operation of the GPS antenna 10 is researched through theoretical calculation, and the antenna distance between the GPS antenna 10 and the Beidou antenna 1 is kept above 2.5 m.
Since the position of the GPS antenna 10 on the helicopter 2 cannot be changed randomly, and the position on the helicopter 2 where the beidou antenna 1 can be mounted is limited, in order to ensure that the beidou antenna 1 does not affect the normal operation of the GPS antenna 10, as shown in fig. 6 and 7, in this embodiment, the beidou antenna 1 is disposed on the tail boom 6 of the helicopter 2.
As shown in fig. 5, specifically, the beidou antenna 1 includes a second beidou communication unit 7 and a second mounting seat 8, the second beidou communication unit 7 is mounted on the second mounting seat 8, the second mounting seat 8 is mounted on the tail boom 6, wherein the second mounting seat 8 is arc-shaped and sleeved on the tail boom 6, and both the second beidou communication unit 7 and the second mounting seat 8 and the first mounting seat 5 and the horizontal stabilizer 3 are connected through bolts. The second beidou communication unit 7 is connected with the beidou host computer inside the helicopter 2 through a second feeder 9, preferably, the second installation seat 8 and the tail beam 6 are both provided with wire passing holes, the second feeder 9 enters the tail transmission shaft fairing through the wire passing holes of the second installation seat 8 and enters the tail beam 6 through the wire passing holes of the tail beam 6, and then the second beidou host computer is paved and connected along a cable channel in the tail beam 6.
According to the technical scheme, the Beidou navigation positioning system is additionally arranged on the current AC311A, AC, AC312E, AC312, H125E and other machine types, and according to the test, the Beidou equipment does not increase any shielding at the installation position, has no interference with GPS and other receiving and transmitting equipment, and the onboard GPS and Beidou normal work and Beidou short message communication functions all operate normally, wherein the safety flying is accumulated for more than 2000 hours on the AC311A, AC312E, H, H125E machine types, and the validity of the patent is verified. By the technical scheme, the real-time tracking of the flying position of the helicopter 2 in the air is realized, the control and the allocation of the helicopter 2 flying are facilitated, the flying safety is guaranteed to the maximum extent, the cost and the weight of the Beidou navigation positioning system are effectively reduced, and the beneficial reference and the reference are provided for the Beidou navigation positioning system additionally installed on other models in the later stage.
The embodiment also provides an anti-interference method for the GPS and the Beidou antenna of the helicopter, which is applied to the anti-interference device, and comprises the following steps:
step A, obtaining the relation between an interference field generated by the Beidou antenna 1 and the antenna distance;
and step B, based on the relation between the interference field generated by the Beidou antenna 1 and the antenna distance, adjusting the antenna distance between the GPS antenna 10 and the Beidou antenna 1 on the helicopter 2, so that the interference field of the Beidou antenna 1 does not interfere with the received signals of the GPS antenna 10.
The obtaining the relation between the interference field generated by the Beidou antenna 1 and the antenna distance comprises the following steps:
the intensity of the received signal generated by the GPS antenna 10 receiving the beidou antenna 1 is calculated,
RSS＝Pt-Lc-Lbf+N
wherein RSS is the intensity of a received signal, pt is the transmitting power of the Beidou antenna 1, N is the noise of the GPS antenna, lbf is the free space loss of the signals of the Beidou antenna interfering with the GPS antenna in a transmission path,
Lbf＝32.5+20lgF+20lgD
d is the antenna distance between the GPS antenna 10 and the beidou antenna 1, and F is the signal frequency of the beidou antenna 1.
In order to overcome the influence of blocking interference generated by electromagnetic waves emitted by Beidou on a GPS receiving antenna, the invention provides an anti-interference device and method for a GPS and a Beidou antenna of a helicopter, which solves the problem of late modification of a Beidou system under the condition that the space outside a small and medium-sized helicopter 2 such as AC311A, AC311, AC312E, AC, H125 and the like is limited, and ensures that the GPS and the Beidou system can work normally.
According to the invention, the antenna distance of the Beidou antenna 1, which does not influence the normal operation of the GPS antenna 10, is researched through theoretical calculation, the proper mounting point of the Beidou antenna 1 is selected in the limited external space position range of the helicopter 2, the normal emission of the Beidou antenna 1, the normal operation of Beidou and GPS systems are realized, the flight safety requirement of the helicopter 2 is met, and the feasibility of the scheme is verified through practical application.
In the description of the present invention, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be fixedly connected, detachably connected, or integrally formed; may be a mechanical or electrical connection; may be directly connected or indirectly connected through an intermediate medium, and may be in communication with the inside of two elements or in interaction with the two elements, the specific meaning of the terms being understood by those skilled in the art. Furthermore, the particular features, structures, etc. described in the examples are included in at least one embodiment and those of skill in the art may combine features of different embodiments without contradiction. The scope of the present invention is not limited to the above-described specific embodiments, and embodiments which can be suggested to those skilled in the art without inventive effort according to the basic technical concept of the present invention are all within the scope of the present invention.
Claims (9)
1. The anti-interference device for the GPS and the Beidou antenna of the helicopter is characterized by comprising the Beidou antenna (1), wherein the Beidou antenna (1) is arranged on the helicopter (2), and the Beidou antenna (1) and the GPS antenna (10) of the helicopter (2) keep a reasonable antenna distance, so that an interference field of the Beidou antenna (1) can not interfere with a receiving signal of the GPS antenna (10), and the receiving signal of the GPS antenna (10) can not be influenced by the Beidou antenna (1);
the relation between the interference field generated by the Beidou antenna (1) and the antenna distance comprises the following steps:
RSS＝Pt-Lc-Lbf+N，
wherein RSS is the intensity of a received signal, pt is the transmitting power of a Beidou antenna (1), N is the noise of a GPS antenna, lbf is the free space loss of the Beidou antenna interfering signals of the GPS antenna in a transmission path, and Lc is the transmission loss of a cable and a connector;
Lbf＝32.5+20lgF+20lgD
d is the antenna distance between the GPS antenna (10) and the Beidou antenna (1), and F is the signal frequency of the Beidou antenna (1);
through theoretical calculation and experimental verification, when the interference field intensity of the Beidou antenna (1) is insufficient to influence the GPS antenna (10) to normally receive satellite signals, the interference signal intensity RSS generated by the GPS antenna (10) when the GPS antenna (10) receives the Beidou antenna (1) is required to be not more than 8dBm.
2. The helicopter GPS and beidou antenna anti-interference device according to claim 1, characterized in that said beidou antenna (1) is arranged on a horizontal stabilizer (3) of the helicopter (2).
3. The helicopter GPS and Beidou antenna anti-interference device according to claim 2, wherein the Beidou antenna (1) comprises a first Beidou communication unit (4) and a first mounting seat (5), the first Beidou communication unit (4) is mounted on the first mounting seat (5), the first mounting seat (5) is mounted on the horizontal stabilizer (3), and the first Beidou communication unit (4) is connected with a Beidou host computer inside the helicopter (2) through a first feeder line.
4. A helicopter GPS and beidou antenna anti-interference device according to claim 3, wherein the first feeder line is led out of the skin of the horizontal stabilizer (3) through the first mounting seat (5), enters the inside of the tail beam (6) through a gap between the skin of the horizontal stabilizer (3) and the tail beam (6), and is then laid forward along a cable channel in the tail beam (6) to be connected to a beidou host.
5. A helicopter GPS and beidou antenna anti-interference device according to claim 3, wherein the first beidou communication unit (4) is connected with the first mounting seat (5) and the first mounting seat (5) is connected with the horizontal stabilizer (3) through bolts.
6. The helicopter GPS and beidou antenna anti-interference device according to claim 1, characterized in that said beidou antenna (1) is arranged on a tail boom (6) of the helicopter (2).
7. The helicopter GPS and Beidou antenna anti-interference device of claim 6, wherein the Beidou antenna (1) comprises a second Beidou communication unit (7) and a second mounting seat (8), the second Beidou communication unit (7) is mounted on the second mounting seat (8), the second mounting seat (8) is mounted on the tail boom (6), and the second Beidou communication unit (7) is connected with a Beidou host computer inside the helicopter (2) through a second feeder line (9).
8. The helicopter GPS and beidou antenna anti-interference device according to claim 7, wherein the second mounting seat (8) and the tail beam (6) are provided with wire passing holes, the second feeder (9) enters the tail transmission shaft fairing through the wire passing holes of the second mounting seat (8) and enters the inside of the tail beam (6) through the wire passing holes of the tail beam (6), and then is paved forwards along a cable channel in the tail beam (6) to be connected to a beidou host; the second mounting seat (8) is arc-shaped and sleeved on the tail beam (6), and the second Beidou communication unit (7) is connected with the second mounting seat (8) and the first mounting seat (5) is connected with the horizontal stabilizer (3) through bolts.
9. The anti-interference method for the GPS and the Beidou antenna of the helicopter is characterized by comprising the following steps of:
step A, obtaining the relation between an interference field generated by a Beidou antenna (1) and the antenna distance;
step B, based on the relation between an interference field generated by the Beidou antenna (1) and the antenna distance, adjusting the antenna distance between the GPS antenna (10) and the Beidou antenna (1) on the helicopter (2) so that the interference field of the Beidou antenna (1) does not interfere with a received signal of the GPS antenna (10);
the method for acquiring the relation between the interference field generated by the Beidou antenna (1) and the antenna distance comprises the following steps:
the intensity of a received signal generated by the Beidou antenna (1) received by the GPS antenna (10) is calculated,
RSS＝Pt-Lc-Lbf+N
wherein RSS is the intensity of a received signal, pt is the transmitting power of a Beidou antenna (1), N is the noise of a GPS antenna, lbf is the free space loss of the signals of the Beidou antenna interfering with the GPS antenna in a transmission path, lc is the transmission loss of a cable and a connector,
Lbf＝32.5+20lgF+20lgD
d is the antenna distance between the GPS antenna (10) and the Beidou antenna (1), and F is the signal frequency of the Beidou antenna (1);
through theoretical calculation and experimental verification, when the interference field intensity of the Beidou antenna (1) is insufficient to influence the GPS antenna (10) to normally receive satellite signals, the interference signal intensity RSS generated by the GPS antenna (10) when the GPS antenna (10) receives the Beidou antenna (1) is required to be not more than 8dBm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211222836.7A CN115411520B (en) | 2022-10-08 | 2022-10-08 | Helicopter GPS and Beidou antenna anti-interference device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211222836.7A CN115411520B (en) | 2022-10-08 | 2022-10-08 | Helicopter GPS and Beidou antenna anti-interference device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115411520A CN115411520A (en) | 2022-11-29 |
| CN115411520B true CN115411520B (en) | 2023-12-01 |
Family
ID=84169073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211222836.7A Active CN115411520B (en) | 2022-10-08 | 2022-10-08 | Helicopter GPS and Beidou antenna anti-interference device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115411520B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509025U (en) * | 2009-07-14 | 2010-06-16 | 山东电力研究院 | Unmanned helicopter system for inspection tour of overhead lines, poles and towers |
| CN101833102A (en) * | 2010-05-25 | 2010-09-15 | 广州科易光电技术有限公司 | Navigation method and device of electric power line inspection helicopter |
| CN102156289A (en) * | 2011-03-09 | 2011-08-17 | 陕西诺维信息技术有限公司 | Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite |
| CN203745655U (en) * | 2014-02-11 | 2014-07-30 | 西安文理学院 | Multifunctional environment monitoring unmanned aerial vehicle system |
| CN104360356A (en) * | 2014-12-01 | 2015-02-18 | 长沙海格北斗信息技术有限公司 | Second-generation beidou anti-jamming satellite navigation equipment detection method and system |
| CN105182183A (en) * | 2015-09-24 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid |
| CN205004453U (en) * | 2015-09-30 | 2016-01-27 | 湖南北斗讯达科技有限公司 | Big dipper satellite navigation anti -interference antenna |
| CN110401034A (en) * | 2019-08-13 | 2019-11-01 | 中国电子科技集团公司第五十四研究所 | A kind of integrated antenna of communication and navigation |
| CN110954924A (en) * | 2019-12-10 | 2020-04-03 | 上海航天控制技术研究所 | Integrated anti-interference design method for Beidou satellite terminal equipment |
| CN216903323U (en) * | 2022-04-02 | 2022-07-05 | 国网通用航空有限公司 | Refitting structure based on helicopter additional antenna |
-
2022
- 2022-10-08 CN CN202211222836.7A patent/CN115411520B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509025U (en) * | 2009-07-14 | 2010-06-16 | 山东电力研究院 | Unmanned helicopter system for inspection tour of overhead lines, poles and towers |
| CN101833102A (en) * | 2010-05-25 | 2010-09-15 | 广州科易光电技术有限公司 | Navigation method and device of electric power line inspection helicopter |
| CN102156289A (en) * | 2011-03-09 | 2011-08-17 | 陕西诺维信息技术有限公司 | Dual-mode positioning time-service type receiver for compass satellite and global positioning system (GPS) satellite |
| CN203745655U (en) * | 2014-02-11 | 2014-07-30 | 西安文理学院 | Multifunctional environment monitoring unmanned aerial vehicle system |
| CN104360356A (en) * | 2014-12-01 | 2015-02-18 | 长沙海格北斗信息技术有限公司 | Second-generation beidou anti-jamming satellite navigation equipment detection method and system |
| CN105182183A (en) * | 2015-09-24 | 2015-12-23 | 国网山西省电力公司临汾供电公司 | Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid |
| CN205004453U (en) * | 2015-09-30 | 2016-01-27 | 湖南北斗讯达科技有限公司 | Big dipper satellite navigation anti -interference antenna |
| CN110401034A (en) * | 2019-08-13 | 2019-11-01 | 中国电子科技集团公司第五十四研究所 | A kind of integrated antenna of communication and navigation |
| CN110954924A (en) * | 2019-12-10 | 2020-04-03 | 上海航天控制技术研究所 | Integrated anti-interference design method for Beidou satellite terminal equipment |
| CN216903323U (en) * | 2022-04-02 | 2022-07-05 | 国网通用航空有限公司 | Refitting structure based on helicopter additional antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115411520A (en) | 2022-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2467531C2 (en) | Control device for shielding room | |
| CN102590795B (en) | Microwave scattering property test system based on vector network analyzer | |
| US8700031B2 (en) | Method and system for providing wireless communication services | |
| CN101218757A (en) | Method and apparatus for determining an interfering field strength in an aircraft | |
| CN105292507B (en) | Airbome weather detects and communication integrated system | |
| CN115411520B (en) | Helicopter GPS and Beidou antenna anti-interference device and method | |
| CN108061827A (en) | Unmanned plane Electromgnetic seat situation monitoring method, terminal device and system | |
| CN114070385B (en) | GBAS system in complex airport environment and application method | |
| CN117081660B (en) | Wide-beam hidden transmitting platform for synchronous orbit satellite platform | |
| CA2310387A1 (en) | Antenna system and method for operating an antenna system | |
| CN110927720B (en) | SAR sidelobe countermeasure method | |
| CN204189967U (en) | A kind of Vehicular satellite navigation anti-interference antenna | |
| CN115209515A (en) | Transmission power control method and device, storage medium and electronic device | |
| CN110208834A (en) | A kind of binary channels boat-carrying airspace supervision equipment of compatible Beidou and GPS | |
| US20160301439A1 (en) | Combined communications-transponder avionics radio unit | |
| CN212111801U (en) | Civil aviation big dipper navigation antenna | |
| CN209776744U (en) | Integrated multifunctional E navigation mark equipment | |
| Moraitis et al. | Aircraft attenuation measurements and radio interference scenarios between in-cabin and terrestrial cellular networks | |
| CN117741704A (en) | Unmanned aerial vehicle detects decoy system | |
| CN214101363U (en) | Navigation system convenient for air traffic control personnel to command air traffic and improve flight safety | |
| CN215599813U (en) | Remote real-time monitoring system for space signals of navigation equipment | |
| Heinrichs et al. | User RAIM integrity and interference mitigation test results with upgraded German Galileo test range GATE | |
| CN219319484U (en) | Unmanned vehicle's map acquisition system and vehicle | |
| Nguyen et al. | Small aircraft RF interference path loss | |
| US20220322057A1 (en) | Wireless communication apparatus and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |