CN114047512A

CN114047512A - Broadband reconnaissance signal acquisition and high-speed data transmission method

Info

Publication number: CN114047512A
Application number: CN202111291769.XA
Authority: CN
Inventors: 叶惺; 许丽娇
Original assignee: Nanjing Kolson Information Technology Co ltd
Current assignee: Nanjing Kolson Information Technology Co ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2022-02-15

Abstract

The invention relates to the technical field of radar signal reconnaissance, in particular to a method for acquiring broadband reconnaissance signals and transmitting high-speed data; by the method, the search range can be set automatically, the method can adapt to various reconnaissance environments, automatically judges the acquired signals and filters useless signals, so that the data transmission speed is improved; the waveform design is carried out through a widened band efficient intermediate frequency coding modulator and a combined wideband efficient intermediate frequency decoding demodulator, the modulation of pulse description words is completed, and the linearity of a power amplifier in the transmission process is reduced; the encoding and decoding modulator and demodulator of the FPGA are arranged in the radar reconnaissance equipment, radar reconnaissance and transmission are integrated, the demodulation and decoding result is sent to a computer through a network, and the receiving of communication signals is completed, so that the transmission data of the radar signals are improved.

Description

Broadband reconnaissance signal acquisition and high-speed data transmission method

Technical Field

The invention relates to the technical field of radar signal reconnaissance, in particular to a broadband reconnaissance signal acquisition and high-speed data transmission method.

Background

SAR is a radar for obtaining high-resolution images, and utilizes the motion of a radar carrier to simulate a large-aperture antenna, and can find hidden and disguised targets. In order to increase the detection range without losing range resolution, SAR typically employs a chirp signal with a large time-wide bandwidth product characteristic. By using chirp signals, the SAR not only improves detection capability but also has low interception.

When the SAR signal is detected, the dynamic range is too large, the data is too much, and the transmission speed of the data is influenced.

Disclosure of Invention

The invention aims to provide a broadband reconnaissance signal acquisition and high-speed data transmission method, and aims to solve the technical problem that the dynamic range is too large and data are too much to influence the data transmission speed when SAR signals are subjected to reconnaissance in the prior art.

In order to achieve the above object, the present invention provides a method for acquiring broadband scout signals and transmitting high-speed data, comprising the following steps:

setting a required search range and comparison data by using radar reconnaissance equipment, and sending a sweep frequency search signal according to the search range;

periodically capturing an acquisition signal by utilizing radar reconnaissance equipment, and converting the acquisition signal into a pulse description word;

whether the pulse description words meet comparison data is judged, if yes, tracking is continued, and if not, a sweep frequency searching signal is sent again;

the pulse description words meeting the comparison data are modulated by using the modulator, and the requirement on the linearity of the power amplifier in the transmission process is reduced.

The method comprises the following steps of setting a required search range and comparison data by using radar reconnaissance equipment, and sending a sweep search signal according to the search range:

the radar reconnaissance equipment comprises a numerical control unit and a search unit, wherein the numerical control unit is used for setting a search range and comparison data, and the search unit is used for sending a sweep frequency search signal corresponding to the search range.

The method comprises the following steps of periodically capturing a collected signal by using radar reconnaissance equipment, and converting the collected signal into a pulse description word:

the radar reconnaissance equipment further comprises a clock unit, wherein the clock unit provides a high-frequency sampling clock signal, periodic sampling is carried out, and a collected signal is obtained.

the radar reconnaissance equipment further comprises a signal processing unit, wherein the signal processing unit adopts frequency domain channelized multiphase filtering to measure real-time parameters of the acquired signals and form pulse description words, and the pulse description words comprise waveforms, amplitudes, pulse widths and frequencies of the acquired signals.

Wherein, whether the pulse description word meets the comparison data is judged, if yes, the tracking is continued, and if not, the sweep frequency searching signal is sent out again:

the radar reconnaissance equipment performs intermediate frequency conversion on the signals obtained by tracking through the A/D module, forms data of a plurality of working channels through photoelectric processing, and finally converts the data into light path signals through a wavelength division multiplexing mode for transmission.

The method comprises the following steps of modulating a pulse description word meeting comparison data by using a modulator, and reducing the requirement on the linearity of a power amplifier in the transmission process:

and the modulation of the pulse description word is completed by carrying out waveform design through a widened band efficient intermediate frequency coding modulator and a combined wideband efficient intermediate frequency decoding demodulator.

the encoding and decoding modulator and demodulator of the FPGA are arranged in the radar reconnaissance equipment and integrated at a signal receiving end of the radar reconnaissance equipment, so that integration of radar communication and reconnaissance is completed.

According to the method for acquiring the broadband reconnaissance signal and transmitting the high-speed data, the search range can be set automatically, the method can adapt to various reconnaissance environments, the acquired signal can be judged automatically, and useless signals can be filtered, so that the data transmission speed is increased; the waveform design is carried out through a widened band efficient intermediate frequency coding modulator and a combined wideband efficient intermediate frequency decoding demodulator, the modulation of pulse description words is completed, and the linearity of a power amplifier in the transmission process is reduced; the FPGA codec modulator and demodulator are arranged in the radar reconnaissance equipment to complete radar reconnaissance and transmission integration, the FPGA codec modulator and demodulator are used for digitally demodulating and decoding collected signals, the demodulation and decoding results are sent to a computer through a network, and communication signals are received, so that transmission data of radar signals are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart illustrating steps of a method for acquiring a broadband scout signal and transmitting high-speed data according to the present invention.

Detailed Description

Referring to fig. 1, the present invention provides a method for acquiring a broadband scout signal and transmitting high-speed data, comprising the following steps:

s1: setting a required search range and comparison data by using radar reconnaissance equipment, and sending a sweep frequency search signal according to the search range;

s2: periodically capturing an acquisition signal by utilizing radar reconnaissance equipment, and converting the acquisition signal into a pulse description word;

s3: whether the pulse description words meet comparison data is judged, if yes, tracking is continued, and if not, a sweep frequency searching signal is sent again;

s4: the pulse description words meeting the comparison data are modulated by using the modulator, and the requirement on the linearity of the power amplifier in the transmission process is reduced.

In step S1, the radar reconnaissance device includes a numerical control unit and a search unit, where the numerical control unit is used to set a search range and comparison data, the search unit sends a sweep search signal corresponding to the search range, and the code modulator is arranged inside the radar reconnaissance device, and the intermediate frequency code modulator is integrated in the search unit, and receives baseband information sent by the computer through the network, and under the time sequence control of the radar, generates a large-time-width pulse broadband intermediate frequency modulation signal adapted to the radar system to replace a pulse chirp signal generated inside the radar, and after the signal is amplified by the up-converter and the power amplifier of the radar, the radar-based remote high-rate pulse information transmission is realized.

In step S2, the radar reconnaissance device further includes a clock unit that provides a 24MHz clock, and the clock unit provides a high-frequency sampling clock signal to perform periodic sampling to obtain a collection signal; scanning in a preset search range, processing a narrow-band signal output by a receiving channel at each search frequency point by using a low-speed analog-to-digital conversion chip with a high quantization bit number, resetting a new frequency point after processing, obtaining the waveform, amplitude, pulse width and frequency of the signal after frequency sweeping, comparing the acquired information with the comparison data, and when the deviation value of the acquired information and the comparison data does not exceed the preset range, judging that the deviation value is an effective signal, triggering a tracking state by the radar reconnaissance equipment at the moment, and continuously acquiring the wide-band signal.

In step S3, the search unit searches according to the received search range, compares the measurement result with the comparison data after searching for a signal, determines that the signal is a limited signal, locks the signal, then provides a tracking wave gate and controls the output gain of the down converter in real time, the tracking wave gate is sent to the data acquisition module as an enable signal for data acquisition, acquires the I/Q signal when the enable signal is valid, the acquired data is packed into a predetermined data format and sent to the signal processing unit for real-time parameter measurement, and generates PDW from the measurement result, the radar reconnaissance device sends the I/Q raw data, the envelope data and PDW generated by real-time processing to the data storage module for storage, and sends the extracted envelope data and PDW to the numerical control unit for display; the intermediate frequency conversion is carried out on the signals obtained by tracking through the A/D module, data of a plurality of working channels are formed through photoelectric processing, and finally the data are converted into optical path signals through a wavelength division multiplexing mode to be transmitted and transmitted back to a computer network through a receiving end to be processed.

In step S4, the codec modulator and demodulator of the FPGA is disposed in the radar reconnaissance device to complete radar reconnaissance and transmission integration, the codec modulator and demodulator of the FPGA is used to digitally demodulate and decode the acquired signal, and the demodulated and decoded result is sent to a computer through a network to complete reception of the communication signal, thereby improving the transmission data of the radar signal.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A broadband scout signal acquisition and high-speed data transmission method is characterized by comprising the following steps:

2. The method for acquiring broadband scout signals and transmitting high-speed data according to claim 1, wherein in the step of setting a required search range and comparison data by using radar scout equipment and emitting sweep search signals according to the search range:

3. The broadband scout signal acquisition and high-speed data transmission method of claim 2, wherein in the step of periodically capturing the acquisition signal with the radar scout device and converting the acquisition signal into the pulse description word:

4. The broadband scout signal acquisition and high-speed data transmission method of claim 3, wherein in the step of periodically capturing the acquisition signal with the radar scout device and converting the acquisition signal into the pulse description word:

5. The method of claim 4, wherein the step of determining whether the pulse descriptor satisfies the comparison data, if so, continuing to track, and if not, re-sending the sweep search signal comprises:

6. The method of claim 5, wherein the step of modulating the pulse descriptor satisfying the comparison data by the modulator to reduce the requirement for linearity of the power amplifier during transmission comprises:

7. The method of claim 6, wherein the step of modulating the pulse descriptor satisfying the comparison data by the modulator to reduce the requirement for linearity of the power amplifier during transmission comprises: