CN115411520A - Helicopter GPS and Beidou antenna anti-interference device and method - Google Patents
Helicopter GPS and Beidou antenna anti-interference device and method Download PDFInfo
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Abstract
The invention discloses an anti-jamming device and an anti-jamming method for a helicopter GPS and a Beidou antenna, wherein the jamming device comprises the Beidou antenna, the Beidou antenna is arranged on the helicopter, and the Beidou antenna keeps a reasonable antenna distance with the GPS antenna of the helicopter, so that a jamming field of the Beidou antenna cannot disturb 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; lbf =32.5+20lgF +20lgD. According to the invention, the antenna distance of the Beidou antenna which does not influence the normal work of the GPS antenna is researched through theoretical calculation, the selection of a proper Beidou antenna installation point in the limited external space position range of the helicopter is guided, no shielding is needed, the Beidou antenna and the GPS antenna are not interfered, the normal emission of the Beidou antenna and the normal work of both a Beidou system and a GPS system are realized, the flight safety requirement of the helicopter is also 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 helicopter GPS and a Beidou antenna.
Background
The chinese BeiDou Navigation Satellite System (BDS) is a self-developed global Satellite Navigation System in china. 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 recognized suppliers of the United nations satellite navigation Committee. The Beidou satellite navigation system consists of an empty section, a ground section and a user section, can provide high-precision, high-reliability positioning, navigation and time service for various users all day long in the global range, has short message communication capacity, and preliminarily has the capacity of regional navigation, positioning and time service, wherein the positioning precision is 10 meters, the speed measurement precision is 0.2 meter/second, and the time service precision is 10 nanoseconds.
The Beidou equipment uses a receiving and transmitting integrated antenna, receives positioning satellite signals, simultaneously sends the position information of a flight platform to a Beidou communication satellite in a short message (RSMC) mode at intervals, and then the satellite transmits the information to a ground monitoring command base station and finally transmits the information to ground users. The frequency of the short message transmitting signal of the Beidou antenna is close to that of a GPS positioning satellite signal, so that interference can be caused to positioning information close to an airborne GPS during transmitting, and the normal navigation and positioning functions of a GPS system are influenced finally. Meanwhile, if the Beidou antenna is too close to the transmitting antennas of other airborne communication equipment, the positioning information received by the Beidou antenna is interfered by the airborne communication equipment. Therefore, the mounting position of the Beidou antenna also needs to avoid the influence of the medium-high frequency communication antenna above the aircraft cockpit.
If the Beidou system does not transmit signals, beidou and GPS antennas installed on the helicopter respectively receive positioning information of respective satellites, and mutual interference does not exist. As a helicopter flight platform user, the GPS system of original factory equipment needs to be ensured to work normally, and the airborne helicopter position also needs to be tracked and monitored in real time. Therefore, the problem of interference of the Beidou antenna on the GPS antenna is solved by additionally arranging the Beidou system on the helicopter, and the normal work of the GPS installed in the original factory and the realization of the Beidou short message function are ensured.
The GPS receiving antenna suffers from 2 major interferences: spurious interference and jamming interference. The stray interference is related to the natural frequency characteristic of the GPS antenna and is difficult to avoid through space isolation and position adjustment, and the interference is unrelated 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 telecommunication union. The difference between the Beidou short message transmitting frequency and the positioning information frequency (1575.4 Mhz) received by the GPS antenna is not large, and the influence degree of the jamming interference generated by the electromagnetic wave transmitted by the Beidou on the GPS receiving antenna is related to the position of the Beidou antenna. If the position of the Beidou antenna is not suitable, the big interference is generated to the normal work of the GPS.
At present, most helicopters manufactured at home and abroad adopt GPS navigation positioning, and aircraft manufacturers select a position with a higher position and a wide visual field to install a GPS antenna when the helicopters leave a factory so as to obtain better GPS navigation positioning information. The Beidou short message antenna generally adopts an upward transmitting mode of hemispherical radiation, and if the spatial 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 additionally modified in the later stage of the helicopter, the Beidou antenna cannot be installed at a position higher and more favorable than the GPS antenna. The general airborne Beidou equipment is arranged at the position of a machine head, but complex electromagnetic shielding treatment is needed, the design is complex, and the cost is high.
Disclosure of Invention
The invention aims to provide an anti-jamming device and an anti-jamming method for a helicopter GPS and a Beidou antenna, which are used for solving the problems in the prior art.
In order to achieve the above object, in one aspect, the present invention adopts the following technical solutions: an anti-jamming device for a helicopter GPS and Beidou antenna comprises a Beidou antenna, wherein the Beidou antenna is arranged on a helicopter and keeps a reasonable antenna distance with the GPS antenna of the helicopter, so that a jamming field of the Beidou antenna cannot interfere with a receiving signal of the GPS antenna;
wherein, the interference field that the big dipper antenna produced with the relation between the antenna distance includes:
RSS＝Pt-Lc-Lbf+N
the RSS is received signal strength, pt is Beidou antenna transmitting power, N is GPS antenna noise, lbf is free space loss of signals of the Beidou antenna interfering the GPS antenna in a transmission path, and Lc is 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 logarithm, lgD is log10 (D);
final D =10 (Lbf-32.5)/20 Therefore, the minimum value of D is determined by both the free space loss Lbf and the signal frequency F.
As an optional design structure of the technical scheme, when the interference field intensity of the Beidou antenna is not enough to influence the GPS antenna to normally receive satellite signals, the received signal intensity RSS generated by the GPS antenna when receiving the Beidou antenna is not more than 8dBm.
As an optional design structure of the technical scheme, the Beidou antenna is arranged on a horizontal stabilizing plane 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 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 above-mentioned technical scheme, first feeder is drawn forth outside the skin of horizontal stabilizer through first mount pad to get into inside the tail-boom through the gap between horizontal stabilizer and the tail-boom skin, then lay forward along the cable channel in the tail-boom and be connected to big dipper host computer.
As an optional design structure of the technical scheme, the first Beidou communication unit and the first mounting seat are connected through bolts, and the first mounting seat and the horizontal stabilizing surface are connected 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 project organization of above-mentioned technical scheme, the 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 above-mentioned technical scheme, second mount pad and tail-beam all are equipped with the line hole of crossing, the second feeder gets into in the tail-drive shaft fairing through the line hole of crossing of second mount pad to inside getting into the tail-beam through the line hole of crossing of tail-beam, then lay forward along the cable channel in the tail-beam and be connected to big dipper host computer.
As an optional design structure of above-mentioned technical scheme, the second mount pad is the arc and overlaps and establish on the tail-boom, all pass through bolted connection between second big dipper communication unit and the second mount pad and between first mount pad and the horizontal stabilizer.
On the other hand, the invention adopts the following technical scheme: an anti-interference method for a helicopter GPS and a Beidou antenna comprises the following steps:
a, acquiring a relation between an interference field generated by a Beidou antenna and an antenna distance;
and step 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 cannot interfere with the receiving signal of the GPS antenna.
Wherein, the relation between the interference field that obtains big dipper antenna production and antenna distance includes:
calculating the strength of the received signal generated by the Beidou antenna and received by the GPS antenna,
RSS＝Pt-Lc-Lbf+N
the receiving method comprises the following steps that RSS is received signal strength, pt is Beidou antenna transmitting power, N is GPS antenna noise, lbf is free space loss of signals of the Beidou antenna interfering the GPS antenna in a transmission path, and Lc is 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 invention has the beneficial effects that:
according to the invention, the antenna distance that the Beidou antenna does not influence the normal work of the GPS antenna is researched through theoretical calculation, the selection of a proper Beidou antenna mounting point in the limited external space position range of the helicopter is guided, no shielding is needed, the Beidou antenna and the GPS antenna are not interfered, the normal emission of the Beidou antenna and the normal work of both a Beidou system and a GPS system are realized, the flight safety requirement of the helicopter is also 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 received signal strength versus antenna distance in one embodiment of the present 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 installed Beidou antenna in embodiment 1 of the present invention;
fig. 5 is a schematic perspective view of a Beidou antenna in embodiment 2 of the present invention;
fig. 6 is a front view of the Beidou antenna in embodiment 2 of the 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-horizontal stabilizer; 4-a first Beidou communication unit; 5-a first mounting seat; 6-tail beam; 7-a second Beidou communication unit; 8-a second mounting seat; 9-a second feed line; 10-GPS antenna.
Detailed Description
Example 1
As shown in fig. 1-4, this embodiment provides a helicopter GPS and big dipper antenna anti jamming unit, including big dipper antenna 1, big dipper antenna 1 sets up on helicopter 2, and big dipper antenna 1 keeps reasonable antenna distance with helicopter 2's GPS antenna 10 for the interference field of big dipper antenna 1 can not disturb the received signal of GPS antenna 10. Big dipper antenna 1 belongs to helicopter 2 and installs the part additional, and GPS antenna 10 belongs to helicopter 2 and predetermines the part, and big dipper antenna 1 who installs additional and predetermined GPS antenna 10 homoenergetic simultaneously autonomous working can not cause the interference each other.
Wherein, the relation between the interference field that big dipper antenna 1 produced and the antenna distance includes:
RSS＝Pt-Lc-Lbf+N
the Beidou communication terminal has the advantages that the Equivalent Isotropic Radiated Power (EIRP) value of a transmitting signal is 33.5 dBm-49 dBm within the beam width range of a transmitting antenna of the Beidou communication terminal.
RSS is received signal strength, pt is the transmitting power of the Beidou antenna 1, and the transmitting power is calculated according to 49 dBm;
n is GPS antenna 10 noise, calculated here as 3.5 dB;
lbf is the free space loss of the signal of the Beidou antenna interfering 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, calculated here as 1615 (MHz).
lg is the base 10 logarithm, lgD is log10 (D);
final D =10 (Lbf-32.5)/20 Therefore, the minimum value of D is determined by both the free space loss Lbf and the signal frequency F.
By adopting the above calculation method, a graph between the interference field and the antenna distance can be obtained, as shown in fig. 1. For the airborne GPS antenna 10, a broadband antenna is generally used for compatibility with GLONASS, BD, and GPS signals, so there is no suppression on the beidou short message frequency 1615 MHz. For a GPS receiver system, the 1dB compression point (P1 dB) of the LNA is +13dBm. The typical noise value of a GPS receiving antenna is 3.5dB, and at least a 5dB margin is required to ensure the system to work properly. The interference value of the Beidou short message generated at the central point of the GPS antenna is less than 8dBm before LNA amplification. The antenna distance that big dipper antenna 1 does not influence the normal work of GPS antenna 10 is researched through theoretical calculation, and the antenna distance between GPS antenna 10 and big dipper antenna 1 should keep more than 2.5 m.
Because the position of GPS antenna 10 on helicopter 2 can not change at will, and the position that can install big dipper antenna 1 on helicopter 2 is limited moreover, in order to ensure that big dipper antenna 1 does not influence GPS antenna 10 and normally works, as shown in fig. 4, in this embodiment, big dipper antenna 1 sets up on the horizontal stabilizer 3 of helicopter 2.
The helicopter 2 is provided with 3 GPS antennas 10, and as shown in fig. 8, one GPS antenna 10 is installed on the left skin of the cabin ceiling, 6M 4 inserts are embedded in the cabin ceiling, and the support of the GPS antenna 10 is screwed with the cabin ceiling. 4M 5 supporting plate nuts are arranged on the upper surface of the support of the GPS antenna 10 and used for fixing the GPS antenna 10. The side of the bracket of the GPS antenna 10 is provided with a cable through hole, and a rubber ring is arranged on the hole and used for preventing abrasion. According to the modification requirement, the cable through hole of the original antenna needs to be sealed by a cover, a cable through hole phi 30 is formed in the ceiling of a cabin right below a support of the GPS antenna 10, and anti-abrasion treatment is carried out. The cable enters the ceiling of the rear edge of the cabin and is connected with the main cabinet through an X3205 frame and the floor. The other 2 GPS antennas 10 are installed at the top end of the vertical tail of the helicopter and are horizontally installed. According to the detailed design scheme of the helicopter frame, the GPS antenna cable penetrates through the skin and enters the fairing at the upper part of the vertical stabilizer, the GPS antenna cable is connected to the main engine cabinet through the cable channel in the helicopter, and the cable through hole is subjected to anti-abrasion treatment and meets the requirement of electric overlapping, so that redesign and modification are not needed.
As shown in fig. 2 and 3, specifically, the big dipper antenna 1 includes a first big dipper communication unit 4 and a first mounting seat 5, and the first mounting seat 5 is rectangular box-shaped, the first big dipper communication unit 4 is installed on the first mounting seat 5, the first mounting seat 5 is installed on the horizontal stabilizer 3, wherein, all through bolted connection between the first big dipper communication unit 4 and the first mounting seat 5 and between the first mounting seat 5 and the horizontal stabilizer 3. First big dipper communication unit 4 is connected with the inside big dipper host computer of helicopter 2 through first feeder, preferably, first feeder is drawn forth outside the skin of horizontal stabilizer 3 through first mount pad 5 to get into inside the tail boom 6 through the gap between horizontal stabilizer 3 and the 6 skins of tail boom, then lay forward along the cable channel in the tail boom 6 and be connected to the big dipper host computer.
According to the technical scheme, the Beidou navigation and positioning system is additionally arranged on the current models of AC311A, AC311, AC312E, AC312, H125E and the like, through tests, the Beidou equipment does not increase any shielding at the installation position, does not interfere with GPS and other transceiver equipment, the airborne GPS and the Beidou normally work, and the Beidou short message communication function normally works, wherein the accumulated safe flight on the models of AC311A, AC312E, H125 and H125E is more than 2000 hours, and the validity of the patent is verified. By the technical scheme, the flight position of the helicopter 2 in the air is tracked in real time, the helicopter 2 flying is controlled and allocated, the flight safety is guaranteed to the maximum extent, the cost and the weight of the Beidou navigation and positioning system are effectively reduced, and beneficial reference is provided for other models in the later period by additionally arranging the Beidou navigation and positioning system.
The embodiment also provides an anti-interference method for the helicopter GPS and the Beidou antenna, which is applied to the anti-interference device, and the anti-interference method comprises the following steps:
step A, obtaining the relation between an interference field generated by a Beidou antenna 1 and the distance of the antenna;
and step B, adjusting the antenna distance between the GPS antenna 10 and the Beidou antenna 1 on the helicopter 2 based on the relation between the interference field generated by the Beidou antenna 1 and the antenna distance, so that the interference field of the Beidou antenna 1 cannot interfere with the receiving signal of the GPS antenna 10.
Wherein, the relation between the interference field that obtains big dipper antenna 1 production and antenna distance includes:
calculating the strength of the received signal generated by the Beidou antenna 1 received by the GPS antenna 10,
RSS＝Pt-Lc-Lbf+N
wherein RSS is the intensity of received signals, 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 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 the Beidou on a GPS receiving antenna, the invention provides an anti-interference device and an anti-interference method for a helicopter GPS and a Beidou antenna, which solve the problem of additionally modifying a Beidou system in the later period under the condition that the outer space of a small and medium helicopter 2 such as AC311A, AC311, AC312E, AC312, H125 is limited, and ensure that the GPS and the Beidou system can normally work.
According to the invention, the antenna distance of the Beidou antenna 1 without influencing the normal work of the GPS antenna 10 is researched through theoretical calculation, a proper installation point of the Beidou antenna 1 is guided to be selected in the limited external space position range of the helicopter 2, the normal emission of the Beidou antenna 1 and the normal work of both a Beidou system and a GPS system are realized, the flight safety requirement of the helicopter 2 is also met, and the feasibility of the scheme is verified through practical application.
Example 2
As shown in fig. 5-7, this embodiment provides a helicopter GPS and big dipper antenna anti jamming unit, including big dipper antenna 1, big dipper antenna 1 sets up on helicopter 2, and big dipper antenna 1 keeps reasonable antenna distance with helicopter 2's GPS antenna 10 for big dipper antenna 1's interference field can not disturb GPS antenna 10's received signal. Big dipper antenna 1 belongs to helicopter 2 and installs the part additional, and GPS antenna 10 belongs to helicopter 2 and predetermines the part, and big dipper antenna 1 who installs additional and predetermined GPS antenna 10 homoenergetic simultaneous autonomous working can not cause the interference each other.
Wherein, the interference field that big dipper antenna 1 produced with the relation between the antenna distance includes:
RSS＝Pt-Lc-Lbf+N
the EIRP value of the transmitting signal of the Beidou communication terminal is between 33.5dBm and 49dBm within the beam width range of the transmitting antenna of the Beidou communication terminal.
RSS is received signal strength, pt is the transmitting power of the Beidou antenna 1, and the transmitting power is calculated according to 49 dBm;
n is GPS antenna noise, calculated here as 3.5 dB;
lbf is the free space loss of the signal of the big dipper antenna interfering the GPS antenna 10 in the 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, calculated here as 1615 (MHz).
By adopting the above calculation method, a graph between the interference field and the antenna distance can be obtained, as shown in fig. 1. For the airborne GPS antenna 10, in order to be compatible with GLONASS, BD, GPS signals, a broadband antenna is generally adopted, so there is no suppression on the beidou short message frequency 1615 MHz. For a GPS receiver system, the 1dB compression point (P1 dB) of the LNA is +13dBm. The typical noise value of a GPS receiving antenna is 3.5dB, and at least a 5dB margin is required to ensure the system to work properly. The interference value of the Beidou short message generated at the central point of the GPS antenna is less than 8dBm before LNA amplification. The antenna distance that big dipper antenna 1 does not influence the normal work of GPS antenna 10 is researched through theoretical calculation, and the antenna distance between GPS antenna 10 and big dipper antenna 1 should keep more than 2.5 m.
Because the position of GPS antenna 10 on helicopter 2 can not change at will, and the position that can install big dipper antenna 1 on helicopter 2 is limited moreover, in order to ensure that big dipper antenna 1 does not influence GPS antenna 10 and normally work, as shown in fig. 6 and 7, in this embodiment, big dipper antenna 1 sets up on helicopter 2's tail boom 6.
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 installed on the second mounting seat 8, the second mounting seat 8 is installed on the tail beam 6, wherein the second mounting seat 8 is arc-shaped and is sleeved on the tail beam 6, and the second Beidou communication unit 7 and the second mounting seat 8 as well as the first mounting seat 5 and the horizontal stabilizing surface 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 line 9, preferably, the second mounting seat 8 and the tail beam 6 are both provided with line passing holes, the second feeder line 9 enters the tail transmission shaft fairing through the line passing holes of the second mounting seat 8 and enters the tail beam 6 through the line passing holes of the tail beam 6, and then the second Beidou communication unit is forwardly laid along a cable channel in the tail beam 6 and connected to the Beidou host computer.
According to the technical scheme, the Beidou navigation and positioning system is additionally arranged on the current models of AC311A, AC311, AC312E, AC312, H125E and the like, through tests, the Beidou equipment does not increase any shielding at the installation position, does not interfere with GPS and other transceiver equipment, the airborne GPS and the Beidou normally work, and the Beidou short message communication function normally works, wherein the accumulated safe flight on the models of AC311A, AC312E, H125 and H125E is more than 2000 hours, and the validity of the patent is verified. Through the technical scheme, the aerial flight position of the helicopter 2 is tracked in real time, the helicopter 2 flying is controlled and allocated, the flight 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 reference are provided for the later-stage other types of Beidou navigation positioning systems.
The embodiment also provides an anti-interference method for the helicopter GPS and the Beidou antenna, which is applied to the anti-interference device, and the anti-interference method comprises the following steps:
step A, obtaining the relation between an interference field generated by a Beidou antenna 1 and the distance of the antenna;
and step B, adjusting the antenna distance between the GPS antenna 10 and the Beidou antenna 1 on the helicopter 2 based on the relation between the interference field generated by the Beidou antenna 1 and the antenna distance, so that the interference field of the Beidou antenna 1 cannot interfere with the received signal of the GPS antenna 10.
Wherein, the relation between the interference field that obtains big dipper antenna 1 production and antenna distance includes:
calculating the strength of the received signal generated by the Beidou antenna 1 received by the GPS antenna 10,
RSS＝Pt-Lc-Lbf+N
wherein RSS is received signal strength, 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 signal of the Beidou antenna interfering the GPS antenna in the 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 the Beidou on a GPS receiving antenna, the invention provides an anti-interference device and an anti-interference method for a helicopter GPS and a Beidou antenna, which solve the problem of additionally modifying a Beidou system in the later period under the condition that the outer space of a small and medium helicopter 2 such as AC311A, AC311, AC312E, AC312, H125 is limited, and ensure that the GPS and the Beidou system can normally work.
According to the invention, the antenna distance of the Beidou antenna 1 without influencing the normal work of the GPS antenna 10 is researched through theoretical calculation, a proper installation point of the Beidou antenna 1 is guided to be selected in the limited external space position range of the helicopter 2, the normal emission of the Beidou antenna 1 and the normal work of both a Beidou system and a GPS system are realized, the flight safety requirement of the helicopter 2 is also met, and the feasibility of the scheme is verified through practical application.
In the description of the present invention, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and may be fixedly connected, detachably connected, or integrated; may be a mechanical or electrical connection; the terms may be directly connected or indirectly connected through an intermediate medium, and may be communication between two elements or interaction relationship between two elements, and those skilled in the art will understand the specific meaning of the above terms in the present invention. Furthermore, the particular features, structures, etc. described in the examples can be included in at least one implementation and can be combined by one skilled in the art without conflicting therewith. The protection scope of the present invention is not limited to the above-mentioned embodiments, and those embodiments that can be imagined by those skilled in the art without creative efforts based on the basic technical concept of the present invention belong to the protection scope of the present invention.
Claims (10)
1. The anti-jamming device for the helicopter GPS and the Beidou antenna is characterized by comprising the Beidou antenna (1), wherein the Beidou antenna (1) is arranged on the helicopter (2), and the Beidou antenna (1) keeps a reasonable antenna distance with the GPS antenna (10) of the helicopter (2), so that a jamming field of the Beidou antenna (1) cannot interfere with a receiving signal of the GPS antenna (10);
wherein, the relation between the interference field that big dipper antenna (1) produced and the antenna distance includes:
RSS＝Pt-Lc-Lbf+N，
the receiving power of the Beidou antenna (1) is calculated according to the received signal strength of the RSS, the Pt is the transmitting power of the Beidou antenna, the N is the noise of the GPS antenna, the Lbf is the free space loss of the signal of the Beidou antenna interfering the GPS antenna in a transmission path, and the 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).
2. The helicopter GPS and Beidou antenna anti-jamming device according to claim 1, characterized in that, theoretical calculation and experimental verification prove that when the interference field intensity of the Beidou antenna (1) is not enough to affect the GPS antenna (10) to normally receive satellite signals, the intensity RSS of interference signals generated by the Beidou antenna (1) received by the GPS antenna (10) is required to be not more than 8dBm.
3. The helicopter GPS and Beidou antenna anti-jamming device according to claim 1, characterized in that the Beidou antenna (1) is arranged on a horizontal stabilizer (3) of the helicopter (2).
4. The helicopter GPS and Beidou antenna anti-jamming device according to claim 3, characterized in that 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 inside the helicopter (2) through a first feeder line.
5. The helicopter GPS and Beidou antenna anti-interference device according to claim 4 is characterized in that the first feeder line is led out of a skin of the horizontal stabilizing surface (3) through the first mounting seat (5), enters the tail beam (6) through a gap between the horizontal stabilizing surface (3) and the skin of the tail beam (6), and is laid forwards along a cable channel in the tail beam (6) to be connected to a Beidou host computer.
6. The helicopter GPS and Beidou antenna anti-jamming device according to claim 4, characterized in that the first Beidou communication unit (4) and the first mounting base (5) and the horizontal stabilizer (3) are connected through bolts.
7. The helicopter GPS and Beidou antenna anti-jamming device according to claim 1, characterized in that the Beidou antenna (1) is arranged on a tail boom (6) of the helicopter (2).
8. The helicopter GPS and Beidou antenna anti-jamming device according to claim 7, characterized in that the Beidou antenna (1) comprises a second Beidou communication unit (7) and a second mounting seat (8), the second Beidou communication unit (7) is installed on the second mounting seat (8), the second mounting seat (8) is installed on the tail boom (6), and the second Beidou communication unit (7) is connected with a Beidou host inside the helicopter (2) through a second feeder line (9).
9. The helicopter GPS and Beidou antenna anti-jamming device according to claim 8, characterized in that the second mounting base (8) and the tail boom (6) are provided with wire through holes, the second feeder (9) enters the tail transmission shaft fairing through the wire through hole of the second mounting base (8), enters the tail boom (6) through the wire through hole of the tail boom (6), and then is laid forward along a cable channel in the tail boom (6) to be connected to the Beidou host computer; the second mounting seat (8) is arc-shaped and is 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 stabilizing surface (3) through bolts.
10. An anti-interference method for a helicopter GPS and a Beidou antenna is characterized by comprising the following steps:
a, acquiring a relation between an interference field generated by a Beidou antenna (1) and an antenna distance;
b, adjusting the antenna distance between a GPS antenna (10) and the Beidou antenna (1) on the helicopter (2) based on the relation between the interference field generated by the Beidou antenna (1) and the antenna distance, so that the interference field of the Beidou antenna (1) cannot interfere with the received signal of the GPS antenna (10);
wherein, acquire the relation between interference field that big dipper antenna (1) produced and the antenna distance includes:
calculating the strength of a received signal generated by the Beidou antenna (1) received by the GPS antenna (10),
RSS＝Pt-Lc-Lbf+N
wherein RSS is received signal strength, pt is transmitting power of the Beidou antenna (1), N is GPS antenna noise, lbf is free space loss of signals of the Beidou antenna interfering the GPS antenna in a transmission path, lc is transmission loss of cables and joints,
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).
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| CN115411520B (en) | 2023-12-01 |
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