CN111190165B

CN111190165B - Method for realizing serial beam synthesis

Info

Publication number: CN111190165B
Application number: CN202010018349.3A
Authority: CN
Inventors: 王冬华; 夏东方; 沈洋
Original assignee: 724 Research Institute Of China Shipbuilding Corp
Current assignee: 724 Research Institute Of China Shipbuilding Corp
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2024-01-30
Anticipated expiration: 2040-01-08
Also published as: CN111190165A

Abstract

The invention relates to a serial beam synthesis realization method, and belongs to the technical field of radar signal processing. The invention firstly generates sub DBF coefficients matched with N groups of I/Q data before DBF according to the combination of the optical fiber message formats, and under the condition of not analyzing the N groups of the I/Q data before DBF, the serial I/Q data of the M optical fibers are multiplied with the corresponding sub DBF coefficients respectively, and finally, summation is carried out, so that the I/Q data after multi-channel DBF is synthesized. The invention avoids the complicated I/Q data analysis process before the parallel N groups of DBFs; under the condition of changing the number M of the optical fibers, only the sub DBF coefficients need to be updated, and the FPGA software modules can be multiplexed, so that the expandability of the software architecture is effectively enhanced.

Description

Method for realizing serial beam synthesis

Technical Field

The invention belongs to the technical field of radar signal processing.

Background

Digital Beam Forming (DBF) may form multi-channel elevation I/Q data to obtain elevation information of the detected object. After receiving the I/Q data before DBF sent by the multipath optical fiber, the traditional DBF implementation method firstly analyzes the parallel multipath I/Q data before DBF according to the message format of the sending optical fiber, and then multiplies and sums the parallel multipath I/Q data before DBF with DBF coefficients, thereby synthesizing the multipath elevation I/Q data. The DBF implementation method needs to analyze the optical fiber data, and can effectively reduce the programming efficiency of programmers under the condition of more T/R channels; in the case of adding the T/R component in the later stage, the expansibility of the software architecture is poor.

The invention adopts a serial beam synthesis method, does not need to analyze the transmitted optical fiber message, and avoids the complicated data analysis process; under the condition that the number of channels is changed by adding the TR component, only the sub DBF coefficient needs to be updated, and the expandability of the software architecture is greatly enhanced.

Disclosure of Invention

Aiming at the problems that the traditional DBF implementation method needs to analyze parallel multipath pre-DBF I/Q data and the software expansibility is poor under the condition of adding a T/R component, the invention can avoid the complicated pre-DBF I/Q data analysis process by a serial beam synthesis method, and the specific method is as follows:

the TR component transmits N groups of front DBF I/Q data through M optical fibers, each optical fiber consists of N/M groups of I/Q data, sub DBF coefficients matched with the N/M groups of front DBF data are generated according to the combination of the optical fiber message formats, each group of sub DBF coefficients are I, Q interval data streams generated according to the combination of channel sequence numbers, serial I/Q data in each optical fiber are multiplied by corresponding sub DBF coefficients respectively, N/M groups of results multiplied by the sub DBF coefficients in each optical fiber are summed, and finally N/M groups of summation results of the M optical fibers are summed, so that multichannel elevation angle I/Q data are synthesized.

The present invention will be described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Fig. 2 is an effect diagram of the multi-beam synthesis of the present invention.

Detailed Description

The invention realizes the multi-channel digital beam synthesis by a serial beam synthesis method. The specific process is as follows:

m optical fibers send N groups of pre-DBF I/Q data, and each optical fiber contains N/M groups of I/Q data as shown in FIG. 1;

2. according to the message protocol of each optical fiber transmitting data, sub DBF coefficients DBF_1 and DBF_ … DBF_M matched with the serial I/Q data format are generated in a combined mode. Under each distance unit time, each optical fiber transmits N/M groups of I/Q data, optical fiber 1 corresponds to 1 to N/M groups of channels, optical fiber 2 corresponds to N/M+1 to 2N/M channels, optical fiber M corresponds to (M-1) N/M+1 to N channels, and two groups of sub DBF coefficients with I, Q different positions are respectively generated according to the channel sequence number transmitted by each optical fiber, as shown in fig. 1;

3. let the complex signal before DBF be: i+j theta, DBF coefficient is: i '+jθ', the real part of the DBF post-signal is: II '-theta' with the imaginary part being: iθ '+θi'. The N/M paths of serial DBF front I/Q data in each optical fiber are multiplied by two groups of sub DBF coefficients of the ith path respectively to obtain the I of the ith path _i I _i '、θ _i θ _i '、I _i θ _i '、θ _i I _i '；

4. Each optical fiber respectively synthesizes N/M paths of I/Q data, and the N/M paths of synthesized I paths of signals are as follows:the Q paths of signals are as follows: />

5. Synthesizing N paths of I/Q data of M optical fibers to form a Kth optical fiber _i I/Q data of the elevation channels, and I paths of signals after serial beam synthesis of N paths of I/Q data are as follows:

the Q paths of signals are as follows:

the beam synthesis effect diagram of the K elevation angles formed after the serial beam synthesis is shown in fig. 2.

Claims

1. A serial beam synthesis implementation method is characterized in that: receiving N groups of pre-DBF I/Q data sent by M optical fibers, and under each distance unit time, each optical fiber sends N/M groups of I/Q data, wherein optical fiber 1 corresponds to 1 to N/M groups of channels, optical fiber 2 corresponds to N/M+1 to 2N/M channels, optical fiber M corresponds to (M-1) N/M+1 to N channels, firstly, according to a message protocol sent by each optical fiber, sub-DBF coefficients DBF_1 and DBF_ … DBF_M matched with a serial I/Q data format are generated in a combined mode, wherein the sub-DBF coefficients DBF_1 and DBF_ … DBF_M consist of two groups of sub-DBF coefficients which are generated according to I, Q different positions and are generated according to channel sequence numbers sent by each optical fiber, and the pre-DBF complex signal is set as follows: i+j theta, DBF coefficient is: i '+jθ', the real part of the DBF post-signal is: II '-theta' with the imaginary part being: iθ '+θi'; then multiplying the N/M-path serial DBF front I/Q data in the ith optical fiber with two groups I, Q sub DBF coefficients with different positions in the ith path to obtain the I of the ith path _i I' _i 、θ _i θ' _i 、I _i θ' _i 、θ _i I' _i The result obtained by multiplying the ith path is then calculated according to the formulaAnd respectively obtaining an I path signal and a Q path signal synthesized by each optical fiber, and finally according to the formula:

respectively summing the I/Q data combined by N/M of M optical fibers to obtain the Kth optical fiber _i I/Q data of each elevation angle channel, and digital wave beam synthesis of multiple channels is realized.

2. A serial beam synthesis implementation method according to claim 1, characterized in that: the serial sub-DBF coefficients multiplied by each fiber are generated from N/M channel sequential I/Q inter-phase serial combinations transmitted by each fiber.