CN113422633B - Method for enhancing rotor wing shielding signal data of air-ground communication helicopter - Google Patents
Method for enhancing rotor wing shielding signal data of air-ground communication helicopter Download PDFInfo
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- CN113422633B CN113422633B CN202110601479.4A CN202110601479A CN113422633B CN 113422633 B CN113422633 B CN 113422633B CN 202110601479 A CN202110601479 A CN 202110601479A CN 113422633 B CN113422633 B CN 113422633B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/36—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like adapted to receive antennas or radomes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/02—Gyroplanes
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- 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
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- 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
- H01Q1/286—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft
- H01Q1/287—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft integrated in a wing or a stabiliser
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a method for enhancing the blocking signal data of a rotor wing of an air-ground communication helicopter, which comprises the following steps: (1) positioning the satellite signal transmitting and receiving antenna at the front side or the rear side below the main rotor of the helicopter, and mounting a pair of test antennas at the symmetrical positions of the other side; (2) checking whether the size and the size of the test antenna are consistent with those of the satellite signal transmitting and receiving antenna, and whether the mounting angle and the transmitting angle of the test antenna and the satellite signal transmitting and receiving antenna are the same; (3) and carrying out correlation calculation on the transmitted and received signals. According to the invention, the effective time range of satellite communication in the variable speed state of the helicopter rotor is accurately calculated by estimating the Doppler effect of the antenna signal, so that the problem that the helicopter rotor shields the satellite signal transmission in different flight stages is solved. The invention reduces the complexity of signal processing by adding the test antenna on the original airplane, and can optimize the process of transmitting and receiving satellite signals by the communication antenna.
Description
Technical Field
The invention relates to the technical field of helicopter and satellite communication, in particular to a method for enhancing rotor wing shielding signal data of an air-ground communication helicopter.
Background
In helicopter to satellite communications, the helicopter rotors (propellers) block the satellite signals and the electromagnetic wave signals that the helicopter transmits to the satellite. The problem of communication disruption due to rotor occlusion severely impacts system performance. Therefore, efficient and reliable signal transmission and processing technology under the condition of rotor wing shielding needs to be researched.
In the prior art, the blocking time of a helicopter rotor is analyzed, the time of an antenna which is not blocked by the rotor is calculated according to parameters such as the appearance size, the antenna installation position and the antenna size of the helicopter, a signal transmission effective time range is obtained, and signals are transmitted in the range.
The prior art has the following disadvantages:
the helicopter of different kinds, model rotor speed under different flight conditions can take place great change, and the real-time speed difference is very obvious, and helicopter signal transmission effective time problem under the constant speed is mainly solved to prior art, and is difficult to effectively calculate rotor effective signal transmission time range when rotor rotation rate changes acutely, still can appear the rotor and shelter from the problem of signal.
Disclosure of Invention
The invention accurately calculates the effective time range of satellite communication under the variable speed state of the helicopter rotor wing through estimating the Doppler effect of antenna signals, and solves the problem that the helicopter rotor wing shields the transmission of satellite signals in different flight stages.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for enhancing the blocking signal data of a helicopter rotor wing in air-ground communication comprises the following steps:
s1: positioning a satellite signal transmitting and receiving antenna at the front side or the rear side below a main rotor of the helicopter, and mounting a pair of test antennas at the symmetrical positions of the other side, wherein the pair of test antennas comprise a test antenna I and a test antenna II;
s2: checking whether the size and the size of the test antenna are consistent with those of the satellite signal transmitting and receiving antenna, and whether the mounting angle and the transmitting angle of the test antenna and the satellite signal transmitting and receiving antenna are the same;
s3: the signal transmitted by the test antenna I is S (t) in the flight process of the helicopter and is transmitted at an angle vertical to the rotation direction of the rotor wing, and when t is greater than 0, S (t) is greater than 0;
s4: during the upward propagation process, a part of the signal S (t) is reflected by the rotor and then propagates downwards, and the part of the signal is received by the test antenna II; the signal received by the test antenna II is B (t);
s5: performing band-pass filtering on the B (T) signal to obtain an effective original signal B1(T), and calculating the duration T1 of the B1(T) signal in a transmission period T;
signal B2(t) ═ s (t) ═ B1(t)/(| B1(t) | s (t) |), 0< t < t 1;
B2(t)＝0,t1<t<T；
s6: the original transmitting signal of the communication antenna is A (t), and the new transmitting signal is
S7: the signal A1(t) can carry out effective signal transmission in the period without the rotor shielding, if the satellite signal received by the communication antenna is A2(t), the signal A2(t) is subjected to signal on-off processing;
S8：
the effect of this step is to filter out the portions of the received satellite signal that are disturbed because of rotor shadowing.
Further, the test antenna I and the test antenna II may be integrated antennas.
The invention has the following beneficial effects:
according to the invention, the effective time range of satellite communication in the variable speed state of the helicopter rotor is accurately calculated by estimating the Doppler effect of the antenna signal, so that the problem that the helicopter rotor shields the satellite signal transmission in different flight stages is solved.
The invention has simple structure after installation, reduces the complexity of signal processing by adding a test antenna on the original airplane, can optimize the transmitting and receiving processes of the communication antenna on satellite signals, and reduces the difficulty of demodulation and noise reduction.
Drawings
Fig. 1 is a structural diagram of a method for enhancing data of an air-ground communication helicopter rotor wing blocking signal provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention accurately calculates the effective time range of satellite communication under the variable speed state of the helicopter rotor wing by estimating the Doppler effect of an antenna signal, and solves the problem that the helicopter rotor wing shields the satellite signal transmission in different flight stages.
The invention provides a method for enhancing the rotor wing shielding signal data of an air-ground communication helicopter, which comprises the following steps of:
1. because the satellite signal transmitting and receiving antenna is positioned at one side (front side or rear side) below the main rotor of the helicopter, if the satellite signal transmitting and receiving antenna is positioned at the front side (the front side is taken as an example, the actual effect is not influenced), a pair of test antennas are arranged at symmetrical positions at the rear side, whether the size and the size of the test antennas are consistent with those of the satellite signal transmitting and receiving antenna and whether the mounting angle and the transmitting angle are the same or not are checked, and the helicopter has transmitting and receiving functions; (as shown in fig. 1).
2. The signal transmitted by the test antenna 1 in the flight process of the helicopter is S (t), and is transmitted at an angle perpendicular to the rotation direction of the rotor wing, and when t is greater than 0, S (t) is greater than 0.
3. During the upward propagation of the signal s (t), a part of the signal is reflected by the rotor and propagates downward, and the part of the signal is received by the test antenna 2; the signal received by the test antenna 2 is b (t).
4. Performing band-pass filtering on the B (T) signal to obtain an effective original signal B1(T), and calculating the duration T1 of the B1(T) signal in a transmission period T;
signal B2(t) ═ s (t) ═ B1(t)/(| B1(t) | s (t) |), 0< t < t 1;
B2(t)＝0，t1<t<T。
5. the original transmitting signal of the communication antenna is A (t), and the new transmitting signal is
6. The signal A1(t) can be effectively transmitted in the period without rotor wing shielding, and if the satellite signal received by the communication antenna is A2(t), the signal A2(t) is subjected to signal on-off processing.
7、
The effect of this step is to filter out the portions of the received satellite signal that are disturbed because of rotor shadowing.
According to the invention, the effective time range of satellite communication in the variable speed state of the helicopter rotor is accurately calculated by estimating the Doppler effect of the antenna signal, so that the problem that the helicopter rotor shields the satellite signal transmission in different flight stages is solved.
The test antenna 1 and the test antenna 2 may be integrated antennas, that is, the test antenna 1 and the test antenna 2 described in this embodiment are integrated into the same antenna.
The invention has simple structure, reduces the complexity of signal processing by adding a test antenna on the original airplane, can optimize the transmitting and receiving processes of the communication antenna on satellite signals, and reduces the difficulty of demodulation and noise reduction.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A method for enhancing the blocking signal data of a helicopter rotor wing in air-ground communication is characterized by comprising the following steps:
s1: positioning a satellite signal transmitting and receiving antenna at the front side or the rear side below a main rotor of the helicopter, and mounting a pair of test antennas at the symmetrical positions of the other side, wherein the pair of test antennas comprise a test antenna I and a test antenna II;
s2: checking whether the size and the size of the test antenna are consistent with those of the satellite signal transmitting and receiving antenna, and whether the mounting angle and the transmitting angle of the test antenna and the satellite signal transmitting and receiving antenna are the same;
s3: the signal transmitted by the test antenna I is S (t) in the flying process of the helicopter and is transmitted at an angle vertical to the rotation direction of the rotor wing, and when t is more than 0, S (t) is more than 0;
s4: during the upward propagation process of the signal S (t), a part of the signal is reflected by the rotor wing and then propagates downwards, and the part of the signal is received by the test antenna II; the signal received by the test antenna II is B (t);
s5: performing band-pass filtering on the B (T) signal to obtain an effective original signal B1(T), and calculating the duration T1 of the B1(T) signal in a transmission period T;
signal B2(t) ═ s (t) ═ B1(t)/(| B1(t) | s (t) |), 0< t 1;
B2(t)＝0，t1＜t＜T；
s6: the original transmitting signal of the communication antenna is A (t), and the new transmitting signal is
S7: the signal A1(t) can carry out effective signal transmission in the period without rotor wing shielding, if the satellite signal received by the communication antenna is A2(t), the signal A2(t) is subjected to signal on-off processing;
S8：
the effect of this step is to filter out the portions of the received satellite signal that are disturbed because of rotor shadowing.
2. The air-ground communication helicopter rotor blocking signal data enhancement method of claim 1, characterized by: the test antenna I and the test antenna II may be integrated antennas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110601479.4A CN113422633B (en) | 2021-05-31 | 2021-05-31 | Method for enhancing rotor wing shielding signal data of air-ground communication helicopter |
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| CN202110601479.4A CN113422633B (en) | 2021-05-31 | 2021-05-31 | Method for enhancing rotor wing shielding signal data of air-ground communication helicopter |
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| CN113422633B true CN113422633B (en) | 2022-08-02 |
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| CN114969965B (en) * | 2022-05-06 | 2023-07-07 | 上海清申科技发展有限公司 | Calculation method and device for shielding rate of helicopter sanitary antenna and electronic equipment |
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