CN102510304A - System capable of achieving improvement of satellite link performance by using intelligent antenna - Google Patents

Abstract

A system capable of achieving improvement of satellite link performance by using an intelligent antenna comprises an antenna array, an analog/digital (A/D) conversion module, a digital/analog (D/A) conversion module and a pre-processing module. The antenna array adopts an antenna array method to receive satellite signals and transmits analog signals output by the D/A conversion module after the signals are synthesized through antenna array beams. The A/D conversion module converts satellite analog signals received by the antenna array into digital signals during downlink and transmits the converted digital signals to the pre-processing module. The D/A conversion module converts the processed digital signals into the analog signals during uplink and sends the analog signals to the antenna array to be transmitted. The pre-processing module conducts beam searching on received system broadcast signals during cell searching, determines cell identity (ID), and system broadcast information comprises beam number information. When a satellite communication link is built, corresponding array element weighting coefficient is determined according to the cell ID, and the received digital signals and the array element weighting coefficient are transmitted to a beam-forming network. The beam-forming network initially adjusts antenna pointing to align to a satellite according to the received digital signals and the array element weighting coefficient, and precise adjusting of the antenna pointing is achieved.

Description

A kind of applying intelligent antenna is realized the system that the satellite link performance strengthens

Technical field

The present invention relates to the system that a kind of applying intelligent antenna realizes that the satellite link performance strengthens, belong to satellite communication field.

Background technology

Satellite communication system is all limited systems of a power and frequency; In order to strengthen the satellite link performance, improve power system capacity, forward link generally adopts increase satellite transmitting antenna bore to increase antenna gain; Or through increasing the purpose that satellites transmits power reaches the link enhancing; Return link generally adopts the increase user's terminal transmitting power to promote link performance, brings pressure not only for the satellite system of power limited but do like this, has also influenced the miniaturization Design of user terminal; The increase of power has also brought the harm of electric electromagnetic radiation, has suppressed the popularization of satellite communication applications.

Summary of the invention

Technology of the present invention is dealt with problems and is: overcome the deficiency of prior art, provide a kind of applying intelligent antenna to realize the system that the satellite link performance strengthens, this system can improve the system link performance and enlarge power system capacity to the satellite communication system of power limited.

Technical solution of the present invention is: a kind of applying intelligent antenna is realized the system that the satellite link performance strengthens, and comprises aerial array, A/D conversion module, D/A conversion module, pretreatment module and beam-forming network;

Aerial array adopts aerial array mode receiving satellite signal, launches after the analog signal of D/A conversion module output is synthesized through antenna array beam;

The A/D conversion module, the Satellite Simulation conversion of signals that when descending aerial array is received becomes digital signal, and the digital signal after will changing sends to pretreatment module; The D/A conversion module, the digital signal after will handling when up converts analog signal to, gives the aerial array emission;

Pretreatment module when Cell searching, is carried out the wave beam search to the system broadcasts signal that receives, and confirms sub-district ID, contains wave beam information in this system broadcast information; When setting up satellite communication link, confirm corresponding array element weight coefficient according to sub-district ID, the digital signal and the array element weight coefficient that receive are transferred to beam-forming network;

Beam-forming network is tentatively adjusted antenna direction to satelloid based on the data signal and the array element weight coefficient that receive, and realizes the accurate adjustment to antenna direction.

Described pretreatment module is confirmed need in system, solidify a form before the ID of sub-district; This form is made up of wave beam number and corresponding array element weight coefficient; The array element weight coefficient is to point to according to the relative satellite of satellite respective beam coverage cell to confirm, described wave beam is number corresponding one by one with sub-district ID.

Described definite sub-district ID also accomplishes antenna tentatively to point to the step of adjustment following:

(3.1) the system broadcasts signal that detect to receive, after deadline and the Frequency Synchronization, the wave beam information in the extraction broadcast message, this wave beam number is sub-district ID;

(3.2) based on sub-district ID, corresponding weighting coefficient values in the lookup table with this weighting coefficient values input beam-forming network, is accomplished antenna by beam-forming network and is tentatively pointed to adjustment.

It is said that antenna direction is carried out accurate adjustment process is following:

Preliminary adjustment antenna direction is to after the satelloid; RNC is according to the accurate adjustment form that solidifies in advance in system wireless network control; From form, obtain all the array element weight coefficients in the beam angle scope that preliminary aligning points to; Successively the array element weight coefficient is passed to beam-forming network; Beam-forming network is according to the array element weight coefficient adjustment antenna direction that receives, and antenna is passed the satellite-signal intensity that receives this moment back system wireless network control RNC simultaneously; System wireless network control RNC judges all satellite-signal intensity that receive, and corresponding array element weight coefficient is transferred to beam-forming network when the strongest with satellite-signal intensity, realizes that by beam-forming network this array element weight coefficient corresponding antenna points to accurately adjustment; Above-mentioned accurate adjustment form is the position of same wave beam inside and the corresponding form of corresponding array element weight coefficient.

It is said that antenna direction is carried out accurate adjustment process is following:

Preliminary adjustment antenna direction is to after the satelloid; The beam selection pre-processing module is based on the accurate adjustment form that solidifies in advance; From form, obtain all the array element weight coefficients in the beam angle scope that preliminary aligning points to; Successively the array element weight coefficient is passed to beam-forming network, beam-forming network is based on the array element weight coefficient adjustment antenna direction that receives; The beam selection pre-processing module receives this antenna direction corresponding satellite-signal and signal calculated intensity; Judge all satellite-signal intensity that receive; Corresponding array element weight coefficient is transferred to beam-forming network when the strongest with satellite-signal intensity, realizes that by beam-forming network this array element weight coefficient corresponding antenna points to accurately adjustment; Above-mentioned accurate adjustment form is the position of same wave beam inside and the corresponding form of corresponding array element weight coefficient.

The present invention compared with prior art beneficial effect is:

(1) system of the present invention to satelloid, makes terminal transmit power more concentrated through synthetic directional beam when return link transmits, and has improved the antenna gain and the back access capability of user terminal.

When (2) system forward link of the present invention receives downstream signal, can obtain gain, improve the forward link receptivity, under equal satellites transmits power condition, increase power system capacity through array antenna received signals.

(3) the present invention also is directed against the special applications scene of satellite mobile communication; Propose a kind of new system cell search procedure and communication link and set up process; When having improved band efficiency, simplified flow process, accelerated the process that Cell searching and communication link are set up.

The present invention is particularly suitable for being applied to the satellite communication field of power and frequency limited.

Description of drawings

Fig. 1 is a system schematic of the present invention;

Fig. 2 is an instance system sketch map in the embodiment of the present invention;

Fig. 3 is an instance system aerial array sketch map in the embodiment of the present invention;

Fig. 4 is an instance system user wave beam coverage diagram in the embodiment of the present invention;

Fig. 5 is that sketch map is divided in the interior sub-district of instance system user wave beam in the embodiment of the present invention.

Embodiment

Introduce the present invention in detail below in conjunction with accompanying drawing.

As shown in Figure 1, a kind of applying intelligent antenna is realized the system that the satellite link performance strengthens, and comprises aerial array, A/D conversion module, D/A conversion module, pretreatment module, beam-forming network.The present invention accomplishes antenna and accurately points to satellite-signal is accomplished in the back by digital signal processing module Base-Band Processing process.

Aerial array adopts aerial array mode receiving satellite signal, launches after the analog signal of D/A conversion module output is synthesized through antenna array beam; The bay number can suitably be chosen according to the actual requirements, and array shape also can be divided into linear array, face battle array etc. according to the geometrical relationship between the array element; The A/D conversion module, the Satellite Simulation conversion of signals that when descending aerial array is received becomes to be convenient to the digital signal of digital processing, and the digital signal after will changing sends to pretreatment module; The D/A conversion module, the digital signal after will handling when up converts analog signal to, gives the aerial array emission; Above-mentioned aerial array and A/D conversion module, D/A conversion module and signal processing module are techniques well known, do not give unnecessary details here.

(1) pretreatment module

Pretreatment module when Cell searching, is carried out the wave beam search to the digital signal that receives, and confirms sub-district ID; When setting up satellite communication link, confirm the array element weight coefficient according to sub-district ID, the digital signal and the array element weight coefficient that receive are transferred to beam-forming network;

Pretreatment module is confirmed need in system, solidify a form before the ID of sub-district; This form is made up of wave beam number and corresponding array element weight coefficient; The array element weight coefficient is to point to according to the relative satellite of satellite respective beam coverage cell to confirm, described wave beam is number corresponding one by one with sub-district ID.

For example, satellite user wave beam coverage diagram is as shown in Figure 4, and antenna array adopts 4 aerial arrays (its system schematic is as shown in Figure 2) in this example, and antenna parameter is provided with as follows:

4 slave antennas are arranged in 00,01,10 and 11 positions like Fig. 3 separately; D among Fig. 3 _xBe x direction unit interval, d _yBe y direction unit interval;

Be controlling antenna wave beam to point, θ is the angle of pitch,

Be the azimuth, (m, n) expression array element number, (m n) is (0,0), (0,1), (1,0) and (1,1).

$d_x=d_y=\frac{\mathrm{\λ}}{2},$ λ is an operation wavelength.

Antenna current amplitude ratio is 1: 1: 1: 1;

The antenna initial phase difference is 0;

Antenna gain is normalized to 1;

The form corresponding with this coverage diagram designs as follows:

Form is the two-dimension table that is made up of wave beam number and array element weight coefficient, wave beam number be as shown in Figure 41,2,3...37, the array element weight coefficient is tried to achieve by formula (1), (2) and (3):

${\mathrm{\θ}}_N={\tan }^{-1}\left(\frac{\cos ({\mathrm{\α}}_N-{\mathrm{\α}}_s)\cos {\mathrm{\β}}_N-0.15}{\sqrt{1-{\left(\cos ({\mathrm{\α}}_N-{\mathrm{\α}}_s)\cos {\mathrm{\β}}_N\right)}^2}}\right)---\left(1\right)$

Wherein, (α _s, 0) and be the Satellite Orbit Determination position, α _sBe orbital longitude; N beam center position is (α _N, β _N), α wherein _NBe N beam center longitude, β _NBe N beam center latitude; θ _NBe the angle of pitch of controlling antenna wave beam to point,

The azimuth of controlling antenna wave beam to point,

Be the weighted value vector of N wave beam, promptly $w_{\mathrm{Nm}}^N=\left[\begin{array}{cccc}{w}_{00}^N& w_{01}^N& w_{10}^N& w_{11}^N\end{array}\right],$ N=1,2,3.....37.

Then form does $\left[\begin{array}{cccc}{w}_{00}^1& w_{01}^1& w_{10}^1& w_{11}^1\\ w_{00}^2& w_{01}^2& w_{10}^2& w_{11}^2\\ .& & & \\ .& & & \\ .& & & \\ w_{00}^{37}& w_{01}^{37}& w_{10}^{37}& w_{11}^{37}\end{array}\right]$

The step of confirming sub-district ID is following:

(3.1) the system broadcasts signal that detect to receive, after deadline and the Frequency Synchronization, the wave beam information in the extraction broadcast message, this wave beam number is sub-district ID;

(3.2) based on sub-district ID, corresponding weighting coefficient values in the lookup table with this weighting coefficient values input beam-forming network, is accomplished antenna by beam-forming network and is tentatively pointed to adjustment.

(2) beam-forming network

Beam-forming network is tentatively adjusted antenna direction to satelloid according to the array element weight coefficient, and realizes antenna direction is accurately adjusted.

Said antenna direction has accurately been adjusted two kinds of implementations:

Mode (1): tentatively adjust antenna direction to after the satelloid; RNC is according to the accurate adjustment form that solidifies in advance in system wireless network control; From form, obtain all the array element weight coefficients in the beam angle scope that preliminary aligning points to; Successively the array element weight coefficient is passed to beam-forming network; Beam-forming network is according to the array element weight coefficient adjustment antenna direction that receives, and antenna is passed the satellite-signal intensity that receives this moment back system wireless network control RNC simultaneously; System wireless network control RNC judges all satellite-signal intensity that receive, and corresponding array element weight coefficient is transferred to beam-forming network when the strongest with satellite-signal intensity, realizes that by beam-forming network this array element weight coefficient corresponding antenna points to accurately adjustment; Above-mentioned accurate adjustment form is the position of same wave beam inside and the corresponding form of corresponding array element weight coefficient.

Mode (2): tentatively adjust antenna direction to after the satelloid; The beam selection pre-processing module is based on the accurate adjustment form that solidifies in advance; From form, obtain all the array element weight coefficients in the beam angle scope that preliminary aligning points to; Successively the array element weight coefficient is passed to beam-forming network, beam-forming network is based on the array element weight coefficient adjustment antenna direction that receives; The beam selection pre-processing module receives this antenna direction corresponding satellite-signal and signal calculated intensity; Judge all satellite-signal intensity that receive; Corresponding array element weight coefficient is transferred to beam-forming network when the strongest with satellite-signal intensity, realizes that by beam-forming network this array element weight coefficient corresponding antenna points to accurately adjustment; Above-mentioned accurate adjustment form is the position of same wave beam inside and the corresponding form of corresponding array element weight coefficient.

This form is made an as above form of principle, and just this form is divided to the inner sub-district of concrete certain wave beam, and the sub-district is divided intensive more, and the antenna-point accuracy adjustment is accurate more.The supposing the system user is positioned at wave beam No. 1, and No. 1 wave beam is divided according to 4 equal portions that carry out as shown in Figure 5, and 1,2,3,4 represent to divide the center of sub-district, back, then hypothesis respectively

Be the M district weighted value vector of No. 1 wave beam, promptly $w_{\mathrm{Nm}}^M=\left[\begin{array}{cccc}{w}_{00}^M& w_{01}^M& w_{10}^M& w_{11}^M\end{array}\right],$ M=1,2,3,4, wherein

Calculating is the (α of this moment according to formula (1), (2), (3) _M, β _M) longitude and latitude of M district center of No. 1 wave beam of expression, then form does

$\left[\begin{array}{cccc}{w}_{00}^1& w_{01}^1& w_{10}^1& w_{11}^1\\ w_{00}^2& w_{01}^2& w_{10}^2& w_{11}^2\\ w_{00}^3& w_{00}^3& w_{00}^3& w_{00}^3\\ w_{00}^4& w_{01}^4& w_{10}^4& w_{11}^4\end{array}\right]$

The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.

Claims (5)

1. an applying intelligent antenna is realized the system that the satellite link performance strengthens, and it is characterized in that: comprise aerial array, A/D conversion module, D/A conversion module, pretreatment module and beam-forming network;

Aerial array adopts aerial array mode receiving satellite signal, launches after the analog signal of D/A conversion module output is synthesized through antenna array beam;

The A/D conversion module, the Satellite Simulation conversion of signals that when descending aerial array is received becomes digital signal, and the digital signal after will changing sends to pretreatment module; The D/A conversion module, the digital signal after will handling when up converts analog signal to, gives the aerial array emission;

Pretreatment module when Cell searching, is carried out the wave beam search to the system broadcasts signal that receives, and confirms sub-district ID, contains wave beam information in this system broadcast information; When setting up satellite communication link, confirm corresponding array element weight coefficient according to sub-district ID, the digital signal and the array element weight coefficient that receive are transferred to beam-forming network;

Beam-forming network is tentatively adjusted antenna direction to satelloid based on the data signal and the array element weight coefficient that receive, and realizes the accurate adjustment to antenna direction.

2. a kind of applying intelligent antenna according to claim 1 is realized the system that the satellite link performance strengthens; It is characterized in that: described pretreatment module is confirmed need in system, solidify a form before the ID of sub-district; This form is made up of wave beam number and corresponding array element weight coefficient; The array element weight coefficient is to point to according to the relative satellite of satellite respective beam coverage cell to confirm, described wave beam is number corresponding one by one with sub-district ID.

3. a kind of applying intelligent antenna according to claim 2 is realized the system that the satellite link performance strengthens, and it is characterized in that described definite sub-district ID and accomplish antenna that tentatively to point to the step of adjustment following:

(3.1) the system broadcasts signal that detect to receive, after deadline and the Frequency Synchronization, the wave beam information in the extraction broadcast message, this wave beam number is sub-district ID;

(3.2) based on sub-district ID, corresponding weighting coefficient values in the lookup table with this weighting coefficient values input beam-forming network, is accomplished antenna by beam-forming network and is tentatively pointed to adjustment.

4. a kind of applying intelligent antenna according to claim 1 is realized the system that the satellite link performance strengthens, and it is characterized in that said that antenna direction is carried out accurate adjustment process is following:

Preliminary adjustment antenna direction is to after the satelloid; RNC is according to the accurate adjustment form that solidifies in advance in system wireless network control; From form, obtain all the array element weight coefficients in the beam angle scope that preliminary aligning points to; Successively the array element weight coefficient is passed to beam-forming network; Beam-forming network is according to the array element weight coefficient adjustment antenna direction that receives, and antenna is passed the satellite-signal intensity that receives this moment back system wireless network control RNC simultaneously; System wireless network control RNC judges all satellite-signal intensity that receive, and corresponding array element weight coefficient is transferred to beam-forming network when the strongest with satellite-signal intensity, realizes that by beam-forming network this array element weight coefficient corresponding antenna points to accurately adjustment; Above-mentioned accurate adjustment form is the position of same wave beam inside and the corresponding form of corresponding array element weight coefficient.

5. a kind of applying intelligent antenna according to claim 1 is realized the system that the satellite link performance strengthens, and it is characterized in that said that antenna direction is carried out accurate adjustment process is following:

Preliminary adjustment antenna direction is to after the satelloid; The beam selection pre-processing module is based on the accurate adjustment form that solidifies in advance; From form, obtain all the array element weight coefficients in the beam angle scope that preliminary aligning points to; Successively the array element weight coefficient is passed to beam-forming network, beam-forming network is based on the array element weight coefficient adjustment antenna direction that receives; The beam selection pre-processing module receives this antenna direction corresponding satellite-signal and signal calculated intensity; Judge all satellite-signal intensity that receive; Corresponding array element weight coefficient is transferred to beam-forming network when the strongest with satellite-signal intensity, realizes that by beam-forming network this array element weight coefficient corresponding antenna points to accurately adjustment; Above-mentioned accurate adjustment form is the position of same wave beam inside and the corresponding form of corresponding array element weight coefficient.

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