Signal detection method and device and detector

Abstract

The invention provides a signal detection method, a signal detection device and a detector, and relates to the technical field of signal detection, initial signals are converted into ultra-narrow impulse pulse signals, the ultra-narrow impulse pulse signals are coded, the sent ultra-narrow impulse pulse signals carry specific coding information, a receiving end can only decode and identify the signals by using the same coding scheme, and the signal detection efficiency is improved. Therefore, useful signals and noise or interference signals are effectively distinguished. According to the embodiment of the invention, high resolution and strong anti-interference capability can be maintained in a complex electromagnetic environment, and a target can be accurately identified even if a large number of interference signals exist.

Description

Technical Field

[0001] The present invention relates to the technical field of signal detection, and in particular to a signal detection method, device and detector. Background Art

[0002] Electronic jamming has become a basic means of warfare in modern warfare. Foreign third-generation fuze jammers have matured. By using digital radio frequency storage technology to accurately store, delay and forward radio frequency signals, it can deceive the speed and distance of the fuze and create a false target, thereby forcing the fuze to explode prematurely or fail to work. The currently commonly used carrier-free ultra-wideband technology fuze can no longer meet the requirements for key indicators such as premature explosion rate, proximity action rate and anti-interference ability of the third-generation fuze jammer. Therefore, it is necessary to develop a new type of radio fuze anti-interference proximity detection technology. Summary of the invention

[0003] The object of the present invention is to provide a signal detection method, device and detector, which can improve the anti-interference ability.

[0004] In a first aspect, an embodiment of the present invention provides a signal detection method, wherein the method comprises: obtaining an excitation square wave input signal; converting the excitation square wave input signal into an ultra-narrow impulse pulse signal, encoding and processing the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal; transmitting the ultra-wideband coded transmission signal to a preset space, and responding to an echo signal reflected by the preset space based on the ultra-wideband coded transmission signal; and performing pulse compression on the echo signal to obtain a correlation peak of the echo signal.

[0005] In combination with the first aspect, an embodiment of the present invention provides a first implementation method of the first aspect, wherein the step of converting the excitation square wave input signal into an ultra-narrow impulse pulse signal includes: generating a non-repetitive random coded pulse source through a high-precision crystal oscillator reference source; sending the non-repetitive random coded pulse source to an impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal.

[0006] In combination with the first aspect, an embodiment of the present invention provides a second implementation of the first aspect, wherein the impulse pulse generating circuit includes a microwave triode and a step recovery diode connected in sequence; the step of sending a non-repetitive random coded pulse source to the impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal includes: driving the non-repetitive random coded pulse source through the microwave triode of the impulse pulse generating circuit to generate a unipolar pulse; and sharpening the falling edge of the unipolar pulse through the step recovery diode of the impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal.

[0007] In combination with the first aspect, an embodiment of the present invention provides a third implementation of the first aspect, wherein the step of encoding and processing an ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal includes: sending the ultra-narrow impulse pulse signal as an excitation signal into a surface acoustic wave tapped delay line; based on the tapped delay line, generating a coded signal corresponding to the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal.

[0008] In combination with the first aspect, an embodiment of the present invention provides a fourth implementation of the first aspect, wherein the step of responding to the echo signal reflected by the ultra-wideband coded transmission signal in the preset space includes: generating a pseudo-random code based on the ultra-wideband coded transmission signal; matching the received echo signal based on the pseudo-random code; and determining the matched echo signal as the echo signal reflected by the ultra-wideband coded transmission signal.

[0009] In combination with the first aspect, an embodiment of the present invention provides a fifth implementation of the first aspect, wherein the step of transmitting an ultra-wideband coded transmission signal to a preset space includes: up-converting the ultra-wideband coded transmission signal to an ultra-high frequency band signal, performing matching adjustment through a preset antenna, and radiating the ultra-high frequency band signal to the preset space.

[0010] In combination with the first aspect, an embodiment of the present invention provides a sixth implementation of the first aspect, wherein the step of performing pulse compression on the echo signal to obtain the correlation peak of the echo signal includes: down-converting the echo signal to an intermediate frequency signal, compensating and amplifying the intermediate frequency signal to obtain a received signal; compressing the received signal to generate the correlation peak of the echo signal.

[0011] In a second aspect, an embodiment of the present invention provides a signal detection device, wherein the device includes: a signal acquisition module, used to acquire an excitation square wave input signal; a first processing module, used to convert the excitation square wave input signal into an ultra-narrow impulse pulse signal, and encode and process the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal; a communication module, used to transmit the ultra-wideband coded transmission signal to a preset space, and respond to an echo signal reflected by the preset space based on the ultra-wideband coded transmission signal; a second processing module, used to perform pulse compression on the echo signal to obtain a correlation peak of the echo signal.

[0012] In a third aspect, an embodiment of the present invention provides a detector, wherein the detector is configured with the above-mentioned signal detection device, and is used to execute the signal detection method of any of the above-mentioned embodiments.

[0013] In combination with the third aspect, an embodiment of the present invention provides a first implementation of the third aspect, wherein the detector includes a signal processing board, a pulse processing component and a signal transceiver, and the signal processing board, the pulse processing component and the signal transceiver are cascaded through a circuit.

[0014] The embodiments of the present invention bring the following beneficial effects: the embodiments of the present invention provide a signal detection method, device and detector, which converts the initial signal into an ultra-narrow impulse pulse signal, encodes it, and the ultra-narrow impulse pulse signal sent carries specific encoding information. The receiving end can only decode and identify the signal by using the same encoding scheme, thereby effectively distinguishing useful signals from noise or interference signals. The embodiments of the present invention can maintain high resolution and strong anti-interference ability in a complex electromagnetic environment, and can accurately identify the target even in the presence of a large number of interference signals.

[0015] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a signal detection method provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a detector provided by an embodiment of the present invention;

[0020] Figure 3 An overall functional block diagram of a detector provided by an embodiment of the present invention;

[0021] Figure 4 A flow chart of another signal detection method provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a surface acoustic wave tapped delay line structure provided by an embodiment of the present invention;

[0023] Figure 6 A functional block diagram corresponding to a transmission channel provided by an embodiment of the present invention;

[0024] Figure 7 A functional block diagram corresponding to a receiving channel provided in an embodiment of the present invention;

[0025] Figure 8 A schematic diagram of the structure of a signal detection device provided by an embodiment of the present invention;

[0026] Fig. 9 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The embodiments of the present invention provide a signal detection method, device and detector, which can improve the anti-interference capability.

[0030] For ease of understanding, a signal detection method provided by an embodiment of the present invention is first described. Figure 1 A flow chart of a signal detection method provided by an embodiment of the present invention is shown, referring to Figure 1 , the method comprises the following steps:

[0031] Step S102, obtaining an excitation square wave input signal.

[0032] Step S104, converting the excitation square wave input signal into an ultra-narrow impulse pulse signal, encoding the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal.

[0033] The embodiment of the present invention converts the initial signal into an ultra-narrow impulse pulse signal and encodes the ultra-narrow impulse pulse signal, so that the transmitted ultra-narrow impulse pulse signal carries specific encoding information. The receiving end can only decode and identify the signal by using the same encoding scheme, thereby effectively distinguishing useful signals from noise or interference signals.

[0034] Compared with traditional continuous wave or square wave signals, ultra-narrow impulse pulses have extremely short duration (usually in nanoseconds or even picoseconds). This feature enables ultra-narrow impulse pulses to provide very high resolution in the time domain, and can more accurately measure the propagation time of the signal to more accurately capture the reflected signal of the target object. Moreover, the spectrum of ultra-narrow impulse pulses covers a frequency range from hundreds of MHz to GHz, which is an ultra-wideband signal. This wideband characteristic helps to improve the ranging and positioning accuracy of the system. Encoding ultra-narrow impulse pulses and sending them as transmission signals to a preset space helps reduce interference from multipath effects and environmental noise.

[0035] Step S106: transmit the ultra-wideband coded transmit signal to a preset space, and respond to an echo signal reflected by the preset space based on the ultra-wideband coded transmit signal.

[0036] Step S108: performing pulse compression on the echo signal to obtain a correlation peak of the echo signal.

[0037] Since the transmitted signal has coded information, only the coded signal can be matched at the receiving end, and the correlation peak can be calculated. Among them, the correlation peak of the coded signal can be detected to further confirm whether the received signal is the expected signal. Correlation peak detection is an effective anti-interference method, because the correlation peak is only generated when the transmitted and received coded information matches, and non-correlated signals can be eliminated or suppressed to ensure the reliability and accuracy of the signal. The receiving end determines the position of the target object by solving the correlation peak, which further improves the anti-interference ability of the system.

[0038] In the specific implementation, the echo signal is pulse compressed, and the target echo has a very high compression ratio (the ratio of the pulse width before transmission to the pulse width after pulse compression), while the compression ratio of the mismatched interference signal is small, which makes full use of the average power of the transmitter to increase the effective distance and improve the anti-interference ability.

[0039] On the basis of the above embodiments, the embodiments of the present invention further provide a detector, which is equipped with a signal detection device corresponding to the above embodiments, and is used to execute a corresponding signal detection method. In specific implementation, the detector includes a signal processing board, a pulse processing component (T / R component) and a signal transceiver (such as an antenna). The signal processing board, the pulse processing component and the signal transceiver are cascaded through circuits to form a complete detection system, and the proximity function is realized in combination with the target detection algorithm. Figure 2 The schematic diagram of the detector is shown to illustrate the process of transmitting and receiving pulses. Specifically, the novel pulse compression anti-interference proximity fuze detector of the embodiment of the present invention is composed of a spread spectrum modulation / pulse compression unit, a signal processing unit, a power management unit and a transceiver antenna.

[0040] The spread spectrum modulation / pulse compression unit mainly completes the functions of narrow pulse generation, spread spectrum modulation, pulse compression, peak detection, transceiver timing switching, up and down frequency conversion, etc. The signal processing unit completes the functions of explosion height setting, non-repetitive random coding, transceiver timing control, detection pulse comparison, height resolution, interference suppression, etc. The power management unit completes the power supply function of the proximity fuze detector signal processing unit and the spread spectrum modulation / pulse compression unit; the transceiver antenna adopts an ultra-wideband antenna (transmitter and receiver in one) to complete the transceiver function of the RF signal. Figure 3 The overall functional block diagram of the detector is shown.

[0041] On the basis of the above-mentioned embodiment, the embodiment of the present invention also provides another signal detection method, which is to provide a new anti-interference proximity fuze detection design scheme based on pulse compression, aiming at the serious threat to fuzes caused by the third-generation fuze jammers currently widely used abroad, and at the same time to meet the urgent demand for the anti-interference capability of modern fuzes, a new design method is proposed. By adopting spread spectrum modulation and pulse compression system, ultra-high code rate spread spectrum modulation / pulse compression technology is realized based on surface acoustic wave devices to meet the anti-interference requirements of fuze detectors.

[0042] In the embodiment of the present invention, when the component is in the transmitting state, the signal passes through the encoding device to obtain an ultra-wideband coded transmission signal, which is amplified and radiated into space after effective matching adjustment of the antenna. Among them, the excitation square wave input signal is first converted into an ultra-narrow impulse pulse signal by a narrow pulse generating circuit. Then, the response of the impulse pulse signal is completed through the integrated encoding circuit (spread spectrum modulation) to obtain an ultra-wideband coded signal, which is then up-converted to an ultra-high frequency band signal by an up-down conversion circuit and finally output by the antenna.

[0043] When the component receives the signal after being reflected by the target, the ultra-wideband coded echo signal enters the compression device of the receiving channel through the synchronous wave gate, and the ultra-high frequency band signal coded echo signal is first received by the antenna, and then down-converted to the intermediate frequency signal through the up-down conversion circuit, and then the signal is compensated and amplified by the low noise amplifier, and then the intermediate frequency coded signal is compressed by the integrated compression circuit (analog pulse compression) to generate the intermediate frequency correlation peak signal. For the echo signal that has not been coded and matched, it cannot pass through the decoding device, and thus cannot be detected by the signal processing board, avoiding interference.

[0044] Specifically, Figure 4 A flowchart of another signal detection method provided by an embodiment of the present invention is shown. Figure 4 , the method comprises the following steps:

[0045] Step S202, obtaining an excitation square wave input signal.

[0046] Step S204, converting the excitation square wave input signal into an ultra-narrow impulse pulse signal.

[0047] Combined with the detector of the above embodiment, the embodiment of the present invention is based on the ultra-high code rate baseband spread spectrum ultra-wideband transmission of the surface acoustic wave filter and the ultra-low sidelobe interference suppression technology of ultra-high code rate pulse compression to reduce the probability of interference. The coded compression surface acoustic wave device has a time delay frequency characteristic, and the delay time varies with the frequency, so that the frequency components in the pulse are stacked in the time domain to form a pulse signal with increased amplitude and narrowed width.

[0048] In specific implementation, the embodiment of the present invention generates a non-repetitive random coding pulse source through a high-precision crystal oscillator reference source, and sends it to the impulse pulse generating circuit as an excitation square wave input signal. The ultra-narrow impulse pulse signal is generated by the method of generating Gaussian pulses through the signal source. After shaping, sharpening and driving, a sub-nanosecond ultra-narrow pulse is generated. The transmission pulse is passed through the encoding device to obtain an ultra-wideband coded transmission signal, which is amplified and radiated into space after effective matching and adjustment of the antenna. In the narrow pulse circuit of the transmission channel, an ultra-narrow pulse with a pulse width of no more than 1ns is generated by designing the circuit, and is sent to the encoding device as an excitation to generate a coded signal with a specified number of bits and bandwidth.

[0049] In a specific implementation, the impulse pulse generating circuit includes a microwave triode and a step recovery diode connected in sequence. The embodiment of the present invention drives the non-repetitive random coding pulse source through the microwave triode of the impulse pulse generating circuit to generate a unipolar pulse. In order to meet the transmission power requirements, the embodiment of the present invention also processes the width and amplitude of the ultra-narrow impulse pulse signal. The step recovery diode of the impulse pulse generating circuit sharpens the falling edge of the unipolar pulse to generate an ultra-narrow impulse pulse signal.

[0050] Specifically, a periodic square wave is used as a signal source, and a microwave triode is driven to generate a unipolar pulse with a large current. At this time, the falling edge of the pulse is relatively slow. The fast step characteristic of the step recovery diode (SRD) is further used to sharpen its falling edge to obtain a Gaussian pulse whose pulse width and waveform can meet the requirements of generating a single-cycle pulse. Furthermore, the embodiment of the present invention also shapes the unipolar Gaussian pulse to obtain a single-cycle narrow pulse. In one embodiment, the unipolar Gaussian pulse can be shaped using a Gaussian filter method.

[0051] Step S206, sending the ultra-narrow impulse pulse signal as an excitation signal to the surface acoustic wave tapped delay line; based on the surface acoustic wave tapped delay line, generating a coded signal corresponding to the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal.

[0052] The core device of the spread spectrum modulation / pulse compression unit of the embodiment of the present invention is a correlator based on surface acoustic wave, the surface acoustic wave signal processing device uses surface acoustic wave technology to complete the signal processing function, and uses surface acoustic wave phase coding generation technology to realize signal encryption processing. In one embodiment, an ultra-wideband narrow pulse impulse surface acoustic wave device is used to generate a Barker code phase coded signal, so that the transmission signal has specific coding information. The Barker code phase coded signal refers to a signal obtained by phase modulating the carrier using the Barker code as the modulation sequence.

[0053] Phase-encoded waveforms can be generated by exciting a SAW tapped delay line with a narrow pulse. Figure 5 The schematic diagram of the structure of the surface acoustic wave tapped delay line is shown. The surface acoustic wave tapped delay line consists of an input interdigital transducer and n tapped output interdigital transducers on a piezoelectric substrate. The output interdigital transducer samples the signal in time along the path of the sound beam. Each sampled signal can be acoustically or electrically weighted in amplitude and phase before being combined with other sampled signals. The total output signal is the sum of the weighted tap output signals.

[0054] When the IDT is divided into independent finger pairs, a delta function voltage is applied to the input IDT end, and a delta function sound signal is generated at the output end, which stimulates different impulse responses accordingly:

[0055]

[0056] Where h(t) is the impulse response function, which represents the response at time (t); w m is the voltage amplitude of the mth finger pair. δ represents the instantaneous pulse. X m is the position of the mth finger pair. s It represents the speed at which sound waves propagate in a medium.

[0057] Perform Fourier transform on the above formula to get:

[0058]

[0059] Where H(ω) is the frequency domain representation of the output signal, where ω is the frequency variable; is a complex exponential function used to convert time domain signals to frequency domain. j is an imaginary unit that satisfies is the phase factor, where m is the total number of samples.

[0060] The corresponding characteristics of the interdigital transducer are only related to the arrangement and weighted amplitude of the interdigital fingers. For an N-pair equiperiodic interdigital array, it can be expressed as:

[0061]

[0062] Where ω0=2πVs / λ, λ is the distance between each pair of fingers. The input transducer is a bandpass filter. ω is the angular frequency, measured in radians per second (rad / s), which describes the periodicity of the signal. ω0 is the center angular frequency, a key point in the frequency response function, usually related to the resonant frequency of the system. N is a constant, the number of equal-periodic interdigital arrays. x is a variable used to calculate the value of H(ω).

[0063] Each tap in the tap area can be regarded as an interdigital array, and the tap spacing is the inverse of the code rate. The frequency response of the input transducer area to each tap is H K (ω), then according to the superposition principle, the frequency response of each tapped delay line can be regarded as the sum of the frequency responses of each tap, as follows:

[0064]

[0065] Where n is the number of taps, are the weighted network amplitude and phase, is the delay of the kth tap transducer, f k is the carrier frequency of the tap output signal, which is determined by the interdigital spacing of the tap output transducer. The number of taps is the coded waveform. Let the amplitude-phase weighting function When equal to 1 or -1, it can form a surface acoustic wave phase coded tapped delay line to achieve coding. The coded information type is Barker code, which is a signal in binary phase coded radar because of its large time-bandwidth product and good correlation characteristics.

[0066] Step S208, transmitting the ultra-wideband coded transmission signal to a preset space.

[0067] Specifically, the ultra-wideband coded transmission signal is up-converted to an ultra-high frequency band signal, matched and adjusted through a preset antenna, and radiated to a preset space. The insertion loss of the coding device is offset by an amplifier circuit, and an intermediate frequency amplifier circuit is added to the output stage. The amplified signal is up-converted and then amplified to ensure that the output signal has sufficient transmission power. The encoder insertion loss is reduced by carrying out matching and debugging of the acoustic-electrical interface, achieving broadband transmission and ensuring the transmission power. Figure 6 The functional block diagram corresponding to the transmission channel is shown.

[0068] Step S210, generating a pseudo-random code according to the ultra-wideband coded transmission signal; matching the received echo signal based on the pseudo-random code; and determining the matched echo signal as the echo signal reflected by the ultra-wideband coded transmission signal.

[0069] Not all signals are received. The embodiment of the present invention improves the anti-interference capability through the coding function of the acoustic surface device and applies it to the ultra-wideband detector. Based on the above steps, the coded signal can be identified after reflection and pulse compressed. For the echo signal that has not been coded and matched, it cannot pass through the decoding device and thus cannot be detected by the signal processing board, thus avoiding interference.

[0070] Each designed surface acoustic wave phase coded tapped delay line device (SAWTDL) corresponds to a set of pseudo-random codes and is in a waiting state. It is used as a matched filter to match the signal input to the SAWTDL and immediately output a correlation peak. That is, when the pseudo-random code of the input signal corresponds to the code of the SAWTDL and the code elements are aligned, the SAWTDL outputs a correlation peak. By processing the correlation peak, the distance and Doppler information contained in the echo can be solved. The signals that do not match it, especially interference and noise, will be suppressed. Each surface acoustic wave phase coded tapped delay line device corresponds to a set of code words, and its matching process is the process of correlating the received code words, and the output correlation peak is the modulus value of the autocorrelation function of the code word. The pulse width of the correlation peak determines the distance resolution, and the main sidelobe ratio (compression ratio) determines the anti-interference ability.

[0071] The impulse signal generation method based on the surface acoustic wave device generates the transmission signal:

[0072] s(t)=b(t)cosω0t

[0073] Where b(t) is the Barker code sequence, and ω0 is the operating frequency of the SAW device.

[0074] When receiving, the corresponding surface acoustic wave device acts as a correlator to complete the correlation calculation of the input signal and the output is:

[0075]

[0076] Echo delay: τ0, when t = τ0, the maximum value of the correlation peak can be output to achieve fixed distance. The faster the code rate, the narrower the compressed pulse, and the higher the corresponding distance resolution.

[0077] Among them, the ultra-wideband coded echo signal enters the compression device of the receiving channel through the synchronization gate, and the correlation peak is obtained after analog pulse compression. The synchronization gate signal is a switch indication signal. When the synchronization gate signal is sent, the switch will be switched. At this time, the transmitting switch is closed and the receiving switch is opened. After this synchronization signal is sent, it can be used as a time reference. After a certain delay, the echo signal returns, and time statistics can be performed to calculate the distance. The suppression process of non-correlated signals can be understood as when the signal is encoded in the transmitting channel, the signal has a coding feature (for example, the signal is a 13-bit code: 1101101001111). When the echo is received, it is compressed again by the acoustic surface correlator and matched with the transmitted code. If the information is consistent, the correlation peak can be analyzed. If the information is inconsistent, it will be suppressed and cannot pass through the acoustic surface device, and the correlation peak will not be output. The effective signal that can pass through the acoustic surface device is the target echo signal.

[0078] Step S212: performing pulse compression on the echo signal to obtain a correlation peak of the echo signal.

[0079] The echo signal is down-converted to an intermediate frequency signal, the intermediate frequency signal is compensated and amplified to obtain a received signal, and the received signal is compressed to generate a correlation peak of the echo signal. Correspondingly, Figure 7 The functional block diagram corresponding to the receiving channel is shown. When the signal passes through the encoding device, the ultra-wideband coded transmission signal is obtained, which is amplified and radiated into space after effective matching adjustment of the antenna. After being reflected by the target, the ultra-wideband coded echo signal enters the compression device of the receiving channel through the synchronization gate, and obtains the correlation peak after analog pulse compression. Combined with the above content, the echo signal that has not been coded and matched cannot pass through the decoding device, and thus cannot be detected by the signal processing board, avoiding interference.

[0080] Among them, one of the core features of SAWTDL is its ability to provide different delay times according to different frequencies. Specifically, when a broadband signal passes through SAWTDL, different frequency components will experience different degrees of time delay. High-frequency components usually have shorter delays, while low-frequency components have longer delays. Due to the above-mentioned time delay characteristics, after receiving the echo signal, the various frequency components that were originally scattered on the time axis will be realigned and superimposed at a specific moment. This phenomenon is called "pulse compression" because it effectively compresses a wide pulse into a narrow pulse while increasing the peak power. As the frequency components are stacked, the amplitude of the output signal increases significantly, while the pulse width decreases accordingly, forming a high-resolution and high-energy pulse signal.

[0081] The embodiment of the present invention uses surface acoustic wave phase coding compression technology to complete the signal decryption function, and performs matched filtering on the received echo signal, so that the signal that matches the decoding correlator can pass, and the signal that does not match it is suppressed. The optimal signal-to-noise ratio is obtained for the detector through coherent accumulation, and a weighted method is used to suppress side lobes, thereby improving the survivability of the detector in complex electromagnetic environments. At the same time, in order to avoid the large consumption of system resources and costs in digital domain weighting, the miniaturization and low power consumption of T / R components are achieved by integrating analog weighting algorithms in pulse compression devices.

[0082] In summary, when performing signal detection, the spread spectrum modulation / pulse compression unit is remotely powered and starts working, the software of the signal processing unit completes initialization loading, and outputs the excitation source according to the setting. At t0, the pulse control module in the signal processing circuit generates a non-repetitive random coding pulse source through a high-precision crystal oscillator reference source, which is sent to the impulse pulse generation circuit. After shaping, sharpening and driving, a sub-nanosecond ultra-narrow pulse is generated. The transmit pulse is passed through the encoding device to obtain an ultra-wideband coded transmission signal, which is amplified and radiated into space after effective matching and adjustment of the antenna. This process will have a coding delay of τ1, and its value is related to the material used in the encoding device. The specific range of this value can be clarified through factory test acceptance. The signal processing circuit will generate a synchronization signal and send it to the RF switch to control the switching of the transceiver channel. After a predetermined delay, the ultra-wideband coded echo signal enters the compression device of the receiving channel, and the correlation peak is obtained after simulated pulse compression. Similarly, this process will also have a compression delay τ3.

[0083] Furthermore, based on the correlation peak output, the signal processing unit detects, amplifies, and samples the signal, identifies and calculates the proximity height according to the signal characteristics, and realizes normal detonation control at the corresponding distance position. The intermediate frequency output correlation peak is calculated according to the following formula to calculate the current height position of the fuze:

[0084]

[0085] Where: R is the current distance of the detector relative to the target; C is the propagation speed of electromagnetic waves in the environment, taking into account the influence of rain and snow; τ is the total delay of the correlation peak relative to time t0 after peak detection.

[0086] Another signal detection method provided by an embodiment of the present invention breaks through the limitations of signal processing speed and complexity of digital spread spectrum modulation and related receiving and decoding through the ultra-high code rate spread spectrum modulation technology and pulse compression technology related characteristics based on surface acoustic wave devices, expands the spectrum width of the radio frequency signal, reduces the probability of being intercepted, and meets the anti-interference requirements of the fuze detector.

[0087] Furthermore, based on the above embodiment, the embodiment of the present invention also provides a signal detection device, Figure 8 A schematic diagram of the structure of a signal detection device provided by an embodiment of the present invention is shown. Figure 8 The device includes: a signal acquisition module 100, used to acquire an excitation square wave input signal; a first processing module 200, used to convert the excitation square wave input signal into an ultra-narrow impulse pulse signal, encode and process the ultra-narrow impulse pulse signal, and obtain an ultra-wideband coded transmission signal; a communication module 300, used to transmit the ultra-wideband coded transmission signal to a preset space, and respond to an echo signal reflected by the preset space based on the ultra-wideband coded transmission signal; a second processing module 400, used to perform pulse compression on the echo signal to obtain a correlation peak of the echo signal.

[0088] A signal detection device provided in an embodiment of the present invention has the same technical features as a signal detection method provided in the above embodiment, and therefore can also solve the same technical problems and achieve the same technical effects.

[0089] Furthermore, in combination with the above-mentioned embodiment, the embodiment of the present invention also provides another signal detection device, wherein the above-mentioned first processing module 200 is also used to generate a non-repetitive random coding pulse source through a high-precision crystal oscillator reference source; and send the non-repetitive random coding pulse source to an impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal.

[0090] Furthermore, the impulse pulse generating circuit includes a microwave triode and a step recovery diode connected in sequence; the above-mentioned first processing module 200 is also used to drive the non-repetitive random coding pulse source through the microwave triode of the impulse pulse generating circuit to generate a unipolar pulse; and to sharpen the falling edge of the unipolar pulse through the step recovery diode of the impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal.

[0091] The first processing module 200 is further used to send the ultra-narrow impulse pulse signal as an excitation signal to the surface acoustic wave tapped delay line; based on the surface acoustic wave tapped delay line, generate a coded signal corresponding to the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal.

[0092] The communication module 300 is further configured to generate a pseudo-random code according to the ultra-wideband coded transmission signal; match the received echo signal based on the pseudo-random code; and determine the matched echo signal as the echo signal reflected by the ultra-wideband coded transmission signal.

[0093] The communication module 300 is also used to up-convert the ultra-wideband coded transmission signal to an ultra-high frequency band signal, perform matching adjustment through a preset antenna, and radiate the ultra-high frequency band signal to a preset space.

[0094] The second processing module 400 is further used to down-convert the echo signal into an intermediate frequency signal, perform compensation amplification on the intermediate frequency signal to obtain a received signal; and compress the received signal to generate a correlation peak of the echo signal.

[0095] An embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above Figures 1 to 4 The embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor when it is run. Figures 1 to 4 The embodiment of the present invention also provides a structural diagram of an electronic device, such as Fig. 9 FIG. 1 is a schematic diagram of the structure of the electronic device, wherein the electronic device includes a processor 91 and a memory 90, the memory 90 stores computer executable instructions that can be executed by the processor 91, and the processor 91 executes the computer executable instructions to implement the above Figures 1 to 4 Any of the methods shown. Fig. 9 In the illustrated embodiment, the electronic device further includes a bus 92 and a communication interface 93, wherein the processor 91, the communication interface 93 and the memory 90 are connected via the bus 92. The memory 90 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 93 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 92 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus 92 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 9Only one bidirectional arrow is used in the diagram, but it does not mean that there is only one bus or one type of bus. The processor 91 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 91 or the instructions in the form of software. The above-mentioned processor 91 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module can be located in a random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register or other mature storage media in the art. The storage medium is located in the memory, and the processor 91 reads the information in the memory and completes the above-mentioned Figures 1 to 4 Any of the methods shown.

[0096] A signal detection method, device and computer program product of a detector provided in an embodiment of the present invention includes a computer-readable storage medium storing a program code, and the instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can refer to the method embodiment, which will not be repeated here. A person skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the above method embodiment, which will not be repeated here. In addition, in the description of the embodiment of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood in specific circumstances. If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0097] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A signal detection method, characterized in that: The method comprises: Get the excitation square wave input signal; Converting the excitation square wave input signal into an ultra-narrow impulse pulse signal, and encoding the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal; Transmitting the ultra-wideband coded transmission signal to a preset space, and responding to an echo signal reflected by the preset space based on the ultra-wideband coded transmission signal; Pulse compression is performed on the echo signal to obtain a correlation peak of the echo signal.

2. The method according to claim 1, characterized in that The step of converting the excitation square wave input signal into an ultra-narrow impulse pulse signal comprises: Generate a non-repetitive random coded pulse source through a high-precision crystal oscillator reference source; The non-repetitive random coding pulse source is sent to an impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal.

3. The method according to claim 2, characterized in that The impulse pulse generating circuit comprises a microwave triode and a step recovery diode connected in sequence; the step of sending the non-repetitive random coding pulse source to the impulse pulse generating circuit to generate an ultra-narrow impulse pulse signal comprises: The non-repetitive random coding pulse source is driven by the microwave triode of the impulse pulse generating circuit to generate a unipolar pulse; The step recovery diode of the impulse pulse generating circuit is used to sharpen the falling edge of the unipolar pulse to generate an ultra-narrow impulse pulse signal.

4. The method according to claim 1, characterized in that: The step of encoding and processing the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal comprises: Sending the ultra-narrow impulse pulse signal as an excitation signal into a tapped delay line of a surface acoustic wave device; Based on the tapped delay line, a coded signal corresponding to the ultra-narrow impulse pulse signal is generated to obtain an ultra-wideband coded transmission signal.

5. The method according to claim 1, characterized in that The step of responding to the echo signal reflected by the preset space based on the ultra-wideband coded transmission signal comprises: Generate a pseudo-random code according to the ultra-wideband coded transmission signal; matching the received echo signal based on the pseudo-random code; The matched echo signal is determined as the echo signal reflected by the ultra-wideband coded transmission signal.

6. The method according to claim 1, characterized in that The step of transmitting the ultra-wideband coded transmission signal to a preset space comprises: The ultra-wideband coded transmission signal is up-converted into an ultra-high frequency band signal, and matching adjustment is performed through a preset antenna to radiate the ultra-high frequency band signal to a preset space.

7. The method according to claim 1, characterized in that The step of performing pulse compression on the echo signal to obtain a correlation peak of the echo signal comprises: Down-converting the echo signal to an intermediate frequency signal, and performing compensation amplification on the intermediate frequency signal to obtain a received signal; The received signal is compressed to generate a correlation peak of the echo signal.

8. A signal detection device, characterized in that: The device comprises: A signal acquisition module, used for acquiring an excitation square wave input signal; A first processing module, used for converting the excitation square wave input signal into an ultra-narrow impulse pulse signal, encoding and processing the ultra-narrow impulse pulse signal to obtain an ultra-wideband coded transmission signal; A communication module, configured to transmit the ultra-wideband coded transmission signal to a preset space, and respond to an echo signal reflected by the preset space based on the ultra-wideband coded transmission signal; The second processing module is used to perform pulse compression on the echo signal to obtain a correlation peak of the echo signal.

9. A detector, characterized in that: The detector is equipped with the signal detection device according to claim 8, and is used to execute the signal detection method according to any one of claims 1-7.

10. The detector according to claim 9, characterized in that: The detector comprises a signal processing board, a pulse processing component and a signal transceiver, and the signal processing board, the pulse processing component and the signal transceiver are cascaded through a circuit.

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