A method for outputting equal power density and a phased array antenna device

Abstract

The present invention discloses an equal power density output method and a phased array antenna device, which belong to the field of satellite communication technology. The method includes: step 1: calculating the off-axis angle and azimuth angle of the target phased array antenna according to the communication target azimuth, the communication target pitch value, and the inertial navigation attitude angle; step 2: calculating the compensation attenuation size of the target phased array antenna according to the off-axis angle and azimuth angle of the target phased array antenna; step 3: querying the attenuation value of the RF branch according to the compensation attenuation size; step 4: controlling the RF module according to the attenuation value of the RF branch to achieve equal power density output. Compared with the traditional solution of adjusting power through an attenuator, the present invention can ensure that the RF power amplifier is always at a relatively saturated working point, thereby ensuring the working efficiency of the RF power amplifier and reducing the power consumption of the terminal.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to an equal power density output method and a phased array antenna device. Background Art

[0002] Satellite communication mobile communication equipment is the abbreviation of "satellite ground station communication system in motion". Through the mobile communication system, mobile carriers such as vehicles, ships, and airplanes can track satellites and other platforms in real time during movement, and continuously transmit multimedia information such as voice, data, and images. Working principle of mobile communication: During the movement of the carrier, due to changes in its posture and geographical location, the original satellite antenna will deviate from the satellite, causing communication interruption. Therefore, these changes of the carrier must be isolated so that the antenna is not affected and always aims at the satellite. This is the main problem to be solved by the antenna stabilization system and is also the premise for mobile carriers to carry out uninterrupted satellite communication. Phased array antenna usually refers to an electronically scanned array, a computer-controlled antenna array. It can generate a beam of radio waves and point to different directions through electronic control without moving the antenna. The power density of the antenna radiated to space is different at different scanning angles θ. In order to ensure that the power of the signal is consistent when it reaches the satellite, the TR component is usually attenuated according to the scanning angle θ value. By reducing the RF output power of the phased array antenna, the difference in antenna gain is compensated to ensure that the power density of the antenna radiated to space is consistent. However, this method has significant defects: as the attenuation increases, not only will the signal quality decrease, but the RF power amplifier will also operate in a non-saturated area, thereby reducing its working efficiency and increasing the power consumption of the terminal equipment. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a method for outputting an equal power density and a phased array antenna device.

[0004] The object of the present invention is achieved through the following technical solutions: The first aspect of the present invention provides: a method for outputting equal power density, comprising the following steps:

[0005] Step 1: Calculate the off-axis angle and azimuth angle of the target phased array antenna according to the communication target azimuth, communication target pitch value, and inertial navigation attitude angle;

[0006] Step 2: Calculate the compensation attenuation of the target phased array antenna according to the off-axis angle and azimuth angle of the target phased array antenna;

[0007] Step 3: Query the attenuation value of the RF branch according to the compensation attenuation value;

[0008] Step 4: Control the RF module according to the attenuation value of the RF branch to achieve equal power density output.

[0009] Preferably, before executing step 1, the following steps are also included:

[0010] The sidelobe levels are calculated by Taylor weighting method or Chebyshev weighting method as: SLL1, SSL2…SLL N When the attenuation value of each RF branch is The weighted value matrix M of , where:

[0011] SLL1 weight matrix ,

[0012] SLL2 weight matrix ,

[0013] …

[0014] SSL N The weighted matrix ;

[0015] Calculate the attenuation value of the weighted matrix M in the array gain , for M1, M2…M N Calculated .

[0016] Preferably, the step 1 further comprises the following steps:

[0017] Define the communication target azimuth as AZ, the communication target elevation value as EL, and the antenna carrier elevation angle as , the heading angle is , the roll angle is ; Calculate EL2=90-EL;

[0018] Then perform the spherical to Euler coordinate transformation:

[0019] ;

[0020] Among them, x1, y1, z1 are respectively a vector, representing the communication target direction defined by the station center rectangular coordinate system; the transformation matrix R x , R y , R z as follows:

[0021] ;

[0022] ;

[0023] Among them, x2, y2, and z2 are respectively a vector, representing the communication target direction defined in the Euler coordinate system defined by the target phased array antenna array surface; finally, the antenna pointing data of the target phased array antenna and the azimuth of the target phased array antenna are obtained. and the target phased array antenna elevation angle :

[0024] .

[0025] Preferably, the compensation attenuation size Loss is calculated by the following formula: .

[0026] Preferably, the step 3 further comprises the following steps:

[0027] Query the one closest to the current compensation attenuation size Loss Value and its corresponding weight matrix M.

[0028] Preferably, the step 4 further comprises the following steps:

[0029] Use the beam controller according to the attenuation value of each RF branch in the weighting matrix M:

[0030] The RF module is controlled to achieve equal power density output.

[0031] The second aspect of the present invention provides: an equal power density output phased array antenna device, used to implement any of the above-mentioned equal power density output methods, comprising:

[0032] A splitter / combiner and a beam controller; the input end of the splitter / combiner is connected to an external RF signal, and the output end of the splitter / combiner is connected to N RF components; the beam controller is connected to N RF components; each RF component is connected to an antenna unit.

[0033] The beneficial effects of the present invention are:

[0034] 1) Compared with the traditional solution of adjusting power through an attenuator, the present invention can ensure that the RF power amplifier is always at a relatively saturated working point, thereby ensuring the working efficiency of the RF power amplifier and reducing the power consumption of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of the equal power density output method;

[0036] Figure 2 Schematic diagram of the relationship between phased array antenna gain and scanning angle θ;

[0037] Figure 3 The structural block diagram of the phased array antenna device with equal power density output;

[0038] Figure 4 This is a schematic diagram of the station center coordinate system. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-Figure 4 The first aspect of the present invention provides: a method for outputting equal power density, comprising the following steps:

[0041] Step 1: Calculate the off-axis angle and azimuth angle of the target phased array antenna according to the communication target azimuth, communication target pitch value, and inertial navigation attitude angle;

[0042] Step 2: Calculate the compensation attenuation of the target phased array antenna according to the off-axis angle and azimuth angle of the target phased array antenna;

[0043] Step 3: Query the attenuation value of the RF branch according to the compensation attenuation value;

[0044] Step 4: Control the RF module according to the attenuation value of the RF branch to achieve equal power density output.

[0045] In this embodiment, the controller is used to control the power supply output voltage, and the output voltage of each power supply branch of the phased array antenna is controlled by the power supply unit, thereby controlling the transmission power of the transmitting component, and finally adjusting the size of the RF signal radiated by the phased array antenna. The equivalent radiated power of the phased array antenna is: EIRP = P T + Gain in, P T is the RF transmission power, Gain is the antenna gain. Figure 2 As shown in Figure 2, the aperture of the phased array antenna will change at different scanning angles θ, so the gain of the phased array antenna Gain There is the following relationship with θ: Therefore, at different phased array antenna scanning angles θ, by controlling Figure 3 The attenuation value of the RF components of the RF branches 2-1 to 2-N can be guaranteed under different θ. EIRP Remain unchanged.

[0046] In some embodiments, before executing step 1, the method further includes the following steps:

[0047] The sidelobe levels are calculated by Taylor weighting method or Chebyshev weighting method: SLL1, SSL2…SLL N When the attenuation value of each RF branch is The weighted value matrix M of , where:

[0048] SLL1 weight matrix ,

[0049] SLL2 weight matrix ,

[0050] …

[0051] SSL N The weighted matrix ;

[0052] Calculate the attenuation value of the weighted matrix M in the array gain , for M1, M2…M N Calculated .

[0053] In some embodiments, the step 1 further comprises the following steps:

[0054] Define the communication target azimuth as AZ, the communication target elevation value as EL, and the antenna carrier elevation angle as , the heading angle is , the roll angle is ; Calculate EL2=90-EL;

[0055] Then perform the spherical to Euler coordinate transformation:

[0056] ;

[0057] Among them, x1, y1, z1 are respectively a vector, representing the communication target direction defined by the station center rectangular coordinate system; the transformation matrix R x , R y , R z as follows:

[0058] ;

[0059] ;

[0060] Among them, x2, y2, and z2 are respectively a vector, representing the communication target direction defined in the Euler coordinate system defined by the target phased array antenna array surface; finally, the antenna pointing data of the target phased array antenna and the azimuth of the target phased array antenna are obtained. and the target phased array antenna elevation angle :

[0061] .

[0062] In this embodiment, the communication target azimuth and the communication target elevation value refer to the azimuth and elevation value of the communication target relative to the target phased array antenna, which are calculated by the GNSS coordinates of the target phased array antenna and the GNSS coordinates of the communication target. Figure 4 The communication target azimuth and communication target elevation values ​​shown are defined in the station center rectangular coordinate system, with the station center as the coordinate pole O, the horizontal plane (i.e., xoy plane) as the reference plane, the east axis (i.e., x axis) as the polar axis, P as the distance from the satellite to the station, AZ as the azimuth angle, and EL as the elevation angle. The antenna carrier is specifically the housing for installing and integrating the antenna. If the housing is rigidly connected to a vehicle, aircraft, ship, or other carrier, it also refers to the whole body of the whole machine combined with the vehicle, aircraft, ship, etc. The coordinate transformation matrix R x , R y , R z Defined in Euler coordinate system, use x1, y1, z1 to convert to x2, y2, z2.

[0063] In some embodiments, the compensation attenuation size Loss is calculated by the following formula: .

[0064] In some embodiments, step 3 further comprises the following steps:

[0065] Query the one closest to the current compensation attenuation size Loss Value and its corresponding weight matrix M.

[0066] In some embodiments, step 4 further comprises the following steps:

[0067] Use the beam controller according to the attenuation value of each RF branch in the weighting matrix M:

[0068] The RF module is controlled to achieve equal power density output.

[0069] The second aspect of the present invention provides: an equal power density output phased array antenna device, used to implement any of the above-mentioned equal power density output methods, comprising:

[0070] A splitter / combiner and a beam controller; the input end of the splitter / combiner is connected to an external RF signal, and the output end of the splitter / combiner is connected to N RF components; the beam controller is connected to N RF components; each RF component is connected to an antenna unit.

[0071] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for outputting equal power density, characterized in that: The following steps are involved: Step 1: Calculate the off-axis angle and azimuth angle of the target phased array antenna according to the communication target azimuth, communication target pitch value, and inertial navigation attitude angle; Step 2: Calculate the compensation attenuation of the target phased array antenna according to the off-axis angle and azimuth angle of the target phased array antenna; Step 3: Query the attenuation value of the RF branch according to the compensation attenuation value; Step 4: Control the RF module according to the attenuation value of the RF branch to achieve equal power density output; Before executing step 1, the following steps are also included: The sidelobe levels are calculated as SLL1, SSL2…SLL by Taylor weighting method or Chebyshev weighting method. N When the attenuation value of each RF branch is The weighted value matrix M of , where: SLL1 weight matrix , SLL2 weight matrix , … SSL N The weighted matrix ; Calculate the attenuation value of the weighted matrix M in the array gain , for M1, M2…M N Calculated ; The step 1 also includes the following steps: Define the communication target azimuth as AZ, the communication target elevation value as EL, and the antenna carrier elevation angle as , the heading angle is , the roll angle is ; Calculate EL2=90-EL; Then perform the spherical to Euler coordinate transformation: ； Among them, x1, y1, z1 are respectively a vector, representing the communication target direction defined by the station center rectangular coordinate system; the transformation matrix R x , R y , R z as follows: ； ； Among them, x2, y2, and z2 are respectively a vector, representing the communication target direction defined in the Euler coordinate system defined by the target phased array antenna array surface; finally, the antenna pointing data of the target phased array antenna and the azimuth of the target phased array antenna are obtained. and the target phased array antenna elevation angle : ； The compensation attenuation size Loss is calculated by the following formula: ; The step 3 further comprises the following steps: Query the one closest to the current compensation attenuation size Loss Value and its corresponding weight matrix M.

2. The equal power density output method according to claim 1, characterized in that: The step 4 further comprises the following steps: Use the beam controller according to the attenuation value of each RF branch in the weighting matrix M: The RF module is controlled to achieve equal power density output.

3. A phased array antenna device with equal power density output, characterized in that: The method for realizing the equal power density output method as claimed in claim 1 or 2 comprises: A splitter / combiner and a beam controller; the input end of the splitter / combiner is connected to an external RF signal, and the output end of the splitter / combiner is connected to N RF components; the beam controller is connected to N RF components; each RF component is connected to an antenna unit.

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