Multipath phase control implementation method based on domestic FPGA (Field Programmable Gate Array)

Abstract

The invention belongs to the technical field of industrial chips, and particularly relates to a multi-channel phase control implementation method based on a domestic FPGA. Comprising the following steps that 1, a domestic JFMK50T4 type FPGA chip judges whether a sonar array transmitting unit is subjected to offset angle opening or not according to feedback of an upper computer; step 2, if yes, skipping to step 3; if not, directly generating an emission driving signal; and step 3, creating a corresponding delay module according to the angle offset fed back by the upper computer, and forming a phase difference of two adjacent paths of transmitting signals by performing delay transmission on the adjacent path of transmitting unit so as to simulate the angle offset of the transmitting unit. Under the conditions that a sonar transmitting array cannot deflect and the opening angle is too small, small-opening-angle and multi-beam transmitting can be achieved through the phase control technology, and transmitting signals are output in different directions.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial chips, and in particular relates to a multi-channel phase control implementation method based on a domestic FPGA. Background Art

[0002] JFMK50T4 is a high-performance, low-power FPGA in the JFMK50 product series with field programmable features. The JFMK series FPGA integrates powerful and flexibly configurable programmable resources to implement input and output interfaces, general digital logic, memory, digital signal processing, clock management and other functions. It also provides a wealth of dedicated clock and wiring resources, which are suitable for implementing complex and high-speed digital logic circuits.

[0003] There is a certain relationship between the intensity of sonar action and the beam opening angle. Generally speaking, the smaller the opening angle, the higher the intensity, resulting in better imaging effects. However, there are also certain problems with a too small beam opening angle, that is, the detection range becomes smaller. Therefore, the basic array can be physically offset and a small opening angle signal can be emitted to achieve high-quality, wide-range detection effects. However, there are certain problems with changing the position of the sonar array. The first is the addition of an azimuth control module, which not only increases the cost, but is also difficult to maintain in the water and has a higher probability of failure. In this context, the offset of the sonar array can be simulated by phase control. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art. The present invention provides a multi-channel phased control implementation method based on a domestic FPGA. The multi-channel phased control technology solves the problem that the sonar transmitting array cannot be deflected or the opening angle is too small. The phased control technology can be used to achieve small opening angle and multi-beam transmission, and transmit signal output in different directions, thereby improving the detection capability and anti-interference capability of the sonar, and also enhancing the flexibility and efficiency of the system.

[0005] In order to solve the above technical problems, the present invention provides a method for realizing multi-channel phase control based on domestic FPGA, comprising the following steps:

[0006] Step 1: The domestic JFMK50T4 model FPGA chip determines whether the sonar array transmitting unit is offset according to the feedback from the host computer;

[0007] Step 2: If yes, jump to step 3; if no, directly generate the emission drive signal;

[0008] Step 3: Create a corresponding delay module according to the angle offset feedback from the host computer. By delaying the transmission of the adjacent transmitting units, a phase difference between the two adjacent transmitting signals is formed to simulate the angle offset of the transmitting unit.

[0009] Preferably, in step 3, the transmitting units of each channel have performed angle-shifted transmission, so that there is a certain distance difference between the signals transmitted by adjacent transmitting units, and the distance difference can be quantified by delayed transmission.

[0010] Preferably, assuming that the emission offset angle of each emission unit is α, and the spacing between horizontally adjacent emission units is h, the first emission unit is delayed by Δt compared to the second emission unit, by constructing the following trigonometric function formula:

[0011]

[0012] That is, the delay time required for adjacent paths when simulating a deflection angle of α can be calculated; among them, C is the speed of sound, which is 1480m / s, h is the horizontal spacing of the transmitting units in the actual sonar array, and α is the actual offset angle.

[0013] Preferably, in step 3, the delay module is used to delay the transmission of the transmission signal of an adjacent channel, wherein the delayed transmission time is output by the delay module.

[0014] The present invention also provides a control circuit for realizing multi-channel phase control based on a domestic FPGA, which adopts a multi-channel phase control realization method based on a domestic FPGA as described above, including:

[0015] FPGA chip, using domestic JFMK50T4 model;

[0016] A delay module is used to output the delayed transmission time.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention selects the domestic high-performance FPGA JFMK50T4 chip to realize the sonar multi-channel phase control technology. The multi-channel phase control technology solves the problem that the sonar transmitting array cannot be deflected and the opening angle is too small. Through the phase control technology, the transmission of small opening angle and multi-beam can be realized, and the transmission signal output can be carried out in different directions, thereby improving the detection ability and anti-interference ability of the sonar, and also enhancing the flexibility and efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart of a method for realizing multi-channel phase control based on domestic FPGA of the present invention.

[0020] Figure 2 It is a schematic diagram of forward transmission of the transmitting unit of the present invention.

[0021] Figure 3 It is a schematic diagram of the angle-biased emission of the emission unit of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0023] like Figure 1 As shown, the embodiment of the present invention specifically provides a method for realizing multi-channel phase control based on a domestic FPGA, including the following steps:

[0024] Step 1: The domestic JFMK50T4 model FPGA chip determines whether the sonar array transmitting unit is offset according to the feedback from the host computer;

[0025] Step 2: If yes, jump to step 3; if no, directly generate the emission drive signal;

[0026] Step 3: Create a corresponding delay module according to the angle offset feedback from the host computer. By delaying the transmission of the adjacent transmitting units, a phase difference between the two adjacent transmitting signals is formed to simulate the angle offset of the transmitting unit.

[0027] The embodiments of the present invention further specifically provide the following contents:

[0028] (1) Implementation method of multi-channel phase control

[0029] Firstly, a multi-channel phase control implementation method is designed. By delaying the transmission of two adjacent transmission units, a phase difference of adjacent transmission signals is formed to simulate the angle deviation of the transmission unit. Figure 2 As shown, in the normal case without deflection, the transmission signal is transmitted in the normal direction. When the open angle deflection is required, the transmission delay is performed on the transmitting units of the adjacent paths, such as Figure 3 shown.

[0030] Figure 3 Each transmitting unit has performed angular deflection transmission, and it can be obtained that there is a certain distance difference in the signals transmitted by adjacent transmitting units, and the distance difference can be quantified by delayed transmission. Therefore, assuming that the transmission offset angle of each transmitting unit is α, and the distance between horizontally adjacent transmitting units is h, the first transmitting unit is delayed by Δt compared with the second transmitting unit. By constructing a right triangle, the following formula can be obtained:

[0031]

[0032] Where C is the speed of sound, which is 1480 m / s, h is the horizontal spacing of the transmitting units in the actual sonar array, and α is the actual offset angle. In this way, the delay time required to simulate the adjacent paths of the deflection angle α can be calculated.

[0033] (2) Program deployment of domestic JFMK50T4 model FPGA chip

[0034] Firstly, a corresponding delay module is established according to the angle offset feedback from the host computer, and the delay module is used to delay the transmission of each transmission signal, wherein the delayed transmission time is output by the delay module.

[0035] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A multi-channel phase control implementation method based on domestic FPGA, characterized in that: The steps include: Step 1: The domestic JFMK50T4 model FPGA chip determines whether the sonar array transmitting unit is offset according to the feedback from the host computer; Step 2: If yes, jump to step 3; if no, directly generate the emission drive signal; Step 3: Create a corresponding delay module according to the angle offset feedback from the host computer. By delaying the transmission of the adjacent transmitting units, a phase difference between the two adjacent transmitting signals is formed to simulate the angle offset of the transmitting unit.

2. A method for realizing multi-channel phase control based on domestic FPGA as claimed in claim 1, characterized in that: In step 3, the transmitting units of each channel have performed angle-shifted transmission, so that there is a certain distance difference between the signals transmitted by adjacent transmitting units, and the distance difference can be quantified by delayed transmission.

3. A method for realizing multi-channel phase control based on domestic FPGA as claimed in claim 2, characterized in that: Assuming that the launch offset angle of each launch unit is α, and the distance between horizontally adjacent launch units is h, the first launch unit is launched with a delay of Δt compared to the second launch unit, and the following trigonometric function formula is constructed: That is, the delay time required for adjacent paths when simulating a deflection angle of α can be calculated; among them, C is the speed of sound, which is 1480m / s, h is the horizontal spacing of the transmitting units in the actual sonar array, and α is the actual offset angle.

4. A method for realizing multi-channel phase control based on domestic FPGA as claimed in claim 1, characterized in that: In the step 3, the delay module is used to delay the transmission of the transmission signal of an adjacent channel, wherein the delayed transmission time is output by the delay module.

5. A multi-channel phase control control circuit based on a domestic FPGA, using a multi-channel phase control method based on a domestic FPGA as claimed in any one of claims 1 to 4, characterized in that: include: FPGA chip, using domestic JFMK50T4 model; A delay module is used to output the delayed transmission time.

Images