阅读说明：本技术 无线电引信及其相位校正方法、平台及可读存储介质 (Radio fuze and phase correction method, platform and readable storage medium thereof ) 是由 赵晶 武小梅 杨建红 柴丁 冯强 郑子栋 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种顺序通道量化的无线电引信,包括多通道调频连续波射频收发前端电路、中频信号调理电路、多通道ADC、信号处理电路。由于多通道ADC采用轮询方式按固定顺序逐个量化各个接收通道,造成不同通道采样时刻存在差异,直接用比相测角时结果偏差大。本发明可以实现采样时钟的对角度测量的校正,引信根据FFT结果的幅度最大值所在的位置,计算出中频信号的频率,利用已知采样率计算采样时刻差对应相位差,再用这个相位差对多通道的相位进行校正,降低轮询模数转换造成的相位差,提高多通道间利用相位差计算角度的精度。本发明可简化并行ADC的数量,简化引信硬件电路。(The invention discloses a sequential channel quantized radio fuse, which comprises a multichannel frequency modulation continuous wave radio frequency transceiving front-end circuit, an intermediate frequency signal conditioning circuit, a multichannel ADC and a signal processing circuit. Because the multichannel ADC quantizes each receiving channel one by one according to a fixed sequence in a polling mode, sampling moments of different channels have differences, and the result deviation is large when the multichannel ADC is directly used for measuring angles compared with the receiving channels. The invention can realize the correction of the angle measurement of the sampling clock, the fuze calculates the frequency of the intermediate frequency signal according to the position of the maximum amplitude value of the FFT result, the known sampling rate is used for calculating the phase difference corresponding to the sampling time difference, and the phase difference is used for correcting the phase of multiple channels, thereby reducing the phase difference caused by the polling analog-to-digital conversion and improving the precision of the angle calculation by using the phase difference among the multiple channels. The invention can simplify the number of the parallel ADCs and simplify the fuse hardware circuit.)

1. A radio fuze with sequential channel quantization comprises a multi-channel frequency modulation continuous wave radio frequency transceiving front-end circuit (1), an intermediate frequency signal conditioning circuit (2), a multi-channel analog-to-digital converter (3) and a signal processing circuit (4) which are connected in sequence; the number of channels is greater than or equal to 2, wherein,

the multichannel frequency modulation continuous wave radio frequency transceiving front-end circuit (1) is connected with a plurality of receiving antennas and used for receiving multipath echo signals, and the intermediate frequency signal conditioning circuit (2) is used for conditioning the multipath echo signals so that the amplitude of the multipath echo signals meets the requirement of the amplitude of input signals of the multichannel analog-to-digital converter (3); the multichannel analog-to-digital converter (3) performs analog-to-digital conversion on the multi-channel echo signals one by one in a polling mode, and the echo signals after the analog-to-digital conversion are sent to the signal processing circuit (4);

the signal processing circuit (4) comprises an FFT frequency estimation module, a phase difference calculation module and a phase correction module, wherein the FFT frequency estimation module performs FFT operation on the echo signal after analog-digital conversion to obtain the frequency f of the echo signal, and the phase difference calculation module calculates the delay time delta t of the sampling period between two sampling channels and the frequency f of the echo signal according to a formulaDetermining the phase error between two sampling channelsThe phase correction module calculates the phase error according to the calculated phase errorAnd performing phase correction on the echo signals of the corresponding channels, and calculating the azimuth angle by using the echo signals after phase correction.

2. The sequential channel quantized radio fuze of claim 1 wherein for real signals, the phase error is used directlyAdding to the phase quantity of the real signal for phase correction, the complex signal being multiplied by the complex signalAnd carrying out phase correction.

3. The sequential channel quantized radio fuze according to claim 1, wherein the multi-channel analog-to-digital converter (3) is a monolithically integrated multi-channel analog-to-digital converter or a multi-channel analog-to-digital conversion using separate devices.

4. The sequential channel quantized radio fuze of claim 1, wherein the multi-channel analog-to-digital converter (3) is a monolithically MCU integrated analog-to-digital converter or a stand-alone scanning multi-channel analog-to-digital converter.

5. A radio fuze for sequential channel quantization of radio frequency local oscillator signals according to claim 1 wherein the independent scan multichannel converter is AD 7175.

6. A phase correction method for a radio fuse for sequential channel quantization, characterized by the steps of:

step 1, performing FFT operation on the echo signal after the analog-digital conversion to obtain the frequency f of the echo signal

Step 2, according to the lag time delta t of the sampling period between the two sampling channels and the frequency f of the echo signal, according to a formulaDetermining the phase error between two sampling channels

Step 3, according to the obtained phase errorAnd performing phase correction on the echo signals of the corresponding channels, and calculating the azimuth angle by using the echo signals after phase correction.

7. The method of claim 4, wherein in step 3, the phase error is directly used for real signalsAdding to the phase quantity of the real signal for phase correction, the complex signal being multiplied by the complex signalAnd carrying out phase correction.

8. A phase correction platform for a sequential channel quantized radio fuse, comprising:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method for phase correction of radio fuze for sequential channel quantization of claim 4 or 5.

9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method for phase correction of a radio fuse for sequential channel quantization of claim 4 or 5.

Technical Field

The invention belongs to the field of radio fuses, and particularly relates to a radio fuse of sequence channel quantization and a phase correction method, a platform and a computer readable storage medium.

Background

The fuze is a device for performing detonation control, ignition control and attitude control on ammunition on the premise of ensuring safety of the ammunition at ordinary times and in launching by utilizing environmental information, target information or according to preset conditions. To a certain extent, the performance of the detonator directly determines the destructive efficacy of the weapon system. With the continuous development of radar technology, the fuze evolves a radio fuze by adopting the radar technology, and information such as target distance, relative speed, target angle and the like is mainly acquired by using a target echo signal. The FM radio fuse is a constant amplitude continuous wave radio fuse whose transmission signal frequency is changed according to modulation signal rule, and its explosion height does not depend on the strength of target electromagnetic wave reflection capability, but is positioned by means of frequency of echo, so that it has the advantages of high spacing precision, less explosion height dispersion, high receiver sensitivity, low working voltage, simple structure and strong anti-interference capability. Based on the advantages, the fuze with the system is widely applied to weapon systems.

The frequency modulation radio fuse adopts a linear frequency modulation system, in order to meet the multifunctional requirement, a circuit structure with multiple sending and multiple receiving is adopted, more information of a target can be obtained through multi-channel receiving, the direction of an antenna beam can be changed by utilizing a digital beam forming technology of multiple receiving, in addition, the angle information of the target can be obtained through the phase difference among multiple antennas, and when the anti-interference application is carried out, the interference signals can be avoided through the digital beam forming.

Multichannel's receipt makes the circuit become complicated, for guaranteeing the synchronization of the interchannel sampling moment, the ADC parallel operation that can adopt a plurality of channel clocks, a plurality of ADCs have increased circuit complexity, the circuit board area has been increased, in order to reduce the circuit board size, if adopt the single-chip or integrate the multichannel ADC completion signal's that arrives in the MCU quantization, adopt the polling mode between the passageway this moment, the passageway carries out analog-to-digital conversion one by one, cause the interchannel sampling moment to have the difference, system performance has been worsened.

Disclosure of Invention

The invention aims to overcome the technical problems existing in the polling quantization of the fuse channels of the multiple receiving channels, eliminate the difference of sampling moments among the channels in an algorithm and reduce the angle measurement error of a phase comparison method.

In order to achieve the above object, the present invention provides a sequential channel quantized radio fuse, which comprises a multichannel frequency modulated continuous wave radio frequency transceiving front-end circuit, an intermediate frequency signal conditioning circuit, a multichannel analog-to-digital converter, and a signal processing circuit, which are connected in sequence; the number of channels is greater than or equal to 2, wherein,

the multichannel frequency modulation continuous wave radio frequency transceiving front-end circuit is connected with a plurality of receiving antennas and used for receiving multipath echo signals, and the intermediate frequency signal conditioning circuit is used for conditioning the multipath echo signals so as to enable the amplitude of the multipath echo signals to meet the requirement of the amplitude of input signals of the multichannel analog-to-digital converter; the multichannel analog-to-digital converter performs analog-to-digital conversion on the multi-channel echo signals one by one in a polling mode, and the echo signals after the analog-to-digital conversion are sent to the signal processing circuit;

the signal processing circuit comprises an FFT frequency estimation module, a phase difference calculation module and a phase correction module, wherein the FFT frequency estimation module performs FFT operation on the echo signal after analog-digital conversion to obtain the frequency f of the echo signal, and the phase difference calculation module calculates the frequency f of the echo signal according to the sampling period lag time delta t between two sampling channels and the frequency f of the echo signal and according to a formulaDetermining the phase error between two sampling channelsThe phase correction module calculates the phase error according to the calculated phase errorAnd performing phase correction on the echo signals of the corresponding channels, and calculating the azimuth angle of the echo signals after the phase correction.

Further, for real signalsIs a direct use of the phase errorAdding to the phase quantity of the real signal for phase correction, the complex signal being multiplied by the complex signalAnd carrying out phase correction.

Furthermore, the multi-channel analog-to-digital converter is a single-chip integrated multi-channel analog-to-digital converter or a multi-channel analog-to-digital converter formed by adopting independent devices.

Further, the multi-channel analog-to-digital converter is an analog-to-digital converter which integrates the MCU monolithically or a separate scanning multi-channel analog-to-digital converter.

Further, the independent scan multi-channel converter is AD 7175.

The present invention also provides a phase correction method for a radio fuse for sequential channel quantization, characterized by comprising the steps of:

step 1, performing FFT operation on the echo signal after the analog-digital conversion to obtain the frequency f of the echo signal

Step 2, according to the lag time delta t of the sampling period between the two sampling channels and the frequency f of the echo signal, according to a formulaDetermining the phase error between two sampling channels

Step 3, according to the obtained phase errorAnd performing phase correction on the echo signals of the corresponding channels, and calculating the azimuth angle by using the echo signals after phase correction.

Further, in step 3, for the real signal, the phase error is directly usedAdding to the phase quantity of the real signal for phase correction, the complex signal being multiplied by the complex signalAnd carrying out phase correction.

The invention also provides a phase correction platform of the sequential channel quantization radio fuse, which is characterized by comprising the following steps:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the above-described method for phase correction of radio fuze for sequential channel quantization.

The invention also provides a computer-readable storage medium, in which a computer program is stored, which is characterized in that the computer program is executed by a processor for the above-mentioned method for phase correction of a radio fuze for sequential channel quantization.

Advantageous effects

The invention can realize that the multichannel radio fuse uses the scanning multichannel ADC, and can still ensure the phase synchronization among the multiple channels when the scanning multichannel ADC performs analog-to-digital conversion one by adopting a polling mode. On the basis, the phase comparison angle measurement method is adopted, so that the precision of angle calculation can be improved. By applying the invention, a single chip or SOC integrated multi-channel ADC can be adopted, the number of ADC chips is simplified, a hardware circuit is simplified, the size of a circuit board is reduced, the volume and the weight of the radio fuse are further reduced, the application range of the fuse is expanded, and the striking precision of a small shell can be improved by adopting the fuse disclosed by the invention.

Drawings

Fig. 1 is a diagram of a radio fuse one-way structure for sequential channel quantization according to the present invention.

Fig. 2 is a schematic diagram of the initial phase difference of signals caused by channel sampling delay during sequential quantization.

Fig. 3 is a signal diagram showing the corresponding signal of a single spectral line of a Fast Fourier Transform (FFT) result.

FIG. 4 is a diagram showing the phase difference of signals corresponding to the difference in sampling time calculated from the FFT result

FIG. 5 shows a phase differenceThe initial phases of the two channels remain the same after channel 2 is corrected.

FIG. 6 is a flow chart of a phase calibration method according to the present invention.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

As shown in fig. 1, the sequential channel quantized radio fuze of the radio frequency local oscillation signal of the present invention includes a multichannel frequency modulated continuous wave radio frequency transceiving front end circuit 1, an intermediate frequency signal conditioning circuit 2, a multichannel analog-to-digital converter (ADC)3, and a signal processing circuit 4, which are connected in sequence. The radio fuse is a multi-channel receive architecture, each channel containing a separate antenna, radio frequency channel, intermediate frequency signal conditioning channel, and ADC input channel.

The ADC in the circuit is an ADC which quantizes multiple channels one by one according to sequence, and can be integrated in a single chip mode or adopt independent devices. The ADC adopted by the invention is an MCU integrated ADC or a scanning multi-channel independent ADC, such as AD 7175.

The multichannel ADC performs analog-to-digital conversion one by one in a polling mode by a single chip or integrated into the MCU, as shown in fig. 2, taking 2 channels as an example, assuming that the initial phases of signals of the two channels are both 0, since the channels are sampled sequentially, the channel 2 lags behind the channel 1 by a sampling period Δ t, and a quantized signal of the channel 2 will have an initial phase Φ.

Referring to fig. 3, in order to compensate for the initial phase error, frequency information of the signal needs to be obtained first, the frequency of the signal can be obtained by Fast Fourier Transform (FFT), and in the fuze, the frequency of the spectral line with the maximum amplitude in the FFT result is taken as the frequency of the target echo.

Referring to fig. 4, after the echo frequency is obtained, a phase error Φ corresponding to the sampling period Δ t may be calculated according to the following formula:

as shown in FIG. 5, the calculated phase correction φ may be added directly to the phase of the signal, or multiplied directly by the phase of the signal if it is a complex signalThus, the correction of the phase difference caused by the sampling time difference between the channels is completed, and the flow chart of the phase correction method of the radio fuse for the radio frequency local oscillator signal sequential channel quantization of the invention is shown in fig. 6. The method comprises the following steps:

step 1, performing FFT operation on the echo signal after the analog-digital conversion to obtain the frequency f of the echo signal

Step 2, according to the lag time delta t of the sampling period between the two sampling channels and the frequency f of the echo signal, according to a formulaDetermining the phase error between two sampling channels

Step 3, according to the obtained phase errorAnd performing phase correction on the echo signals of the corresponding channels.

Then, the azimuth angle is calculated by using the corrected phase.

A second embodiment of the present invention relates to a phase correction platform for a sequential channel quantized radio fuse, comprising:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the phase method described above.

Where the memory and processor are connected by a bus, the bus may comprise any number of interconnected buses and bridges, the buses connecting together one or more of the various circuits of the processor and the memory. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein.

The processor is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And the memory may be used to store data used by the processor in performing operations.

A fourth embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program realizes the above-described method embodiments when executed by a processor.

That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalents, improvements, etc. made within the principle of the present invention are included in the scope of the present invention.