Radar detection and communication transmission method based on piecewise linear frequency modulation signal

A chirp signal and transmission method technology, applied in the field of radar, can solve the problems of unstable Doppler, unfavorable linear amplification, and contradiction of radar transmission power, so as to overcome the contradiction between the power occupied by communication transmission and the power occupied by radar detection, and solve the problem of distance. Blur issue, effect of good distance resolution

Inactive Publication Date: 2018-12-07
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that the communication data demodulation process is not robust to Doppler, and under the same bandwidth condition, the spectrum efficiency of communication is low, it is difficult to meet the transmission of large quantities of data in wartime, and the initial frequency Demodulation method of modulated information
[0004] Xidian University has proposed a multi-carrier chirp signal in its patent "A method for realizing radar detection and communication transmission based on chirp signal" (application number 201710028374, publication number 106772350A). Frequency modulation communication data overcomes the problem that the traditional technology modulates the communication data on the radar signal to reduce the radar detection target distance and speed performance, and the data demodulation process is not robust to Doppler. However, the multi-carrier LFM shared signal is controlled by the main carrier Superimposed with the subcarrier, the main carrier is used for radar detection, and the subcarrier is used for the same i performance. If the power used for communication increases, the power used for radar detection will decrease, and its communication bandwidth will increase with The modulation data varies, so the multi-carrier form is not conducive to the operation of linear amplifiers
That is to say, the existing LMF shared signal technology has a contradiction between communication and radar detection occupying radar transmission power, and there are technical problems that are not conducive to linear amplification.

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  • Radar detection and communication transmission method based on piecewise linear frequency modulation signal
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  • Radar detection and communication transmission method based on piecewise linear frequency modulation signal

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Embodiment 1

[0028] The airborne platform needs to be equipped with a large number of electronic equipment such as radar and communication equipment, but these equipment not only occupy valuable space in the platform, increase its load, and deteriorate the surrounding electromagnetic environment, but also affect the overall performance of avionics equipment, such as airborne radar Detection and communication use their own transmitters. In the prior art, there is a contradiction between communication and radar detection occupying radar transmission power, and it is not conducive to linear amplification work. The present invention explores and researches this situation, and proposes a segmented Radar detection and communication transmission method of chirp signal, see figure 1 , including the following steps:

[0029] (1) Radar communication data preprocessing: serial-to-parallel conversion and grouping of the communication data to be sent to obtain several arrays to be transmitted with N-bi...

Embodiment 2

[0043] The radar detection and communication transmission method of segmented chirp signal is the same as embodiment 1, and the generation of segmented chirp (PLFM) signal described in step 3 includes the following steps:

[0044] (3a) Input the array to be transmitted to the segmented chirp signal generator.

[0045] (3b) Determine D according to the lowest binary number of the array to be transmitted 2 The plus or minus of the pitch frequency, the calculation formula is as follows:

[0046]

[0047] Among them, a represents the binary value of the lowest bit of the array to be sent, and sign(a) represents D 2 Segment modulation frequency polarity; the array to be sent is the array to be transmitted, and the present invention only needs to calculate the middle segment D 2 The positive or negative of the pitch frequency.

[0048] (3c) Select the time width corresponding to the number corresponding to the high (N-1) binary number of the array to be transmitted as P 2 The...

Embodiment 3

[0064] The radar detection and communication transmission method of segmented chirp signal is the same as embodiment 1-2, and the method for demodulating radar communication data described in step 7 includes the following steps:

[0065] (7a) Calculate the order of the fractional Fourier transform of the echo, and set the calculated order into the fractional Fourier transform demodulator.

[0066] (7b) Carry out fractional Fourier transform of setting orders on the echo, each order obtains the amplitude value on the frequency sampling point, and draws the order corresponding to the amplitude value on the order-frequency-amplitude plane- Frequency-magnitude plot.

[0067] (7c) Retrieve the order-dimensional coordinate value of the peak point on the order-frequency-amplitude diagram, select the coordinate with only one peak value from the selected order-dimensional coordinates, and use the coordinate transformation formula μ=-cot(pπ / 2), to get D in the echo 2 The modulation f...

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Abstract

The invention discloses a radar detection and communication transmission method based on piecewise linear frequency modulation signals to solve the problems that the radar detection performance is reduced after radar signals modulate communication data and that shared signals are not conducive to linear amplification. The method includes the following concrete steps: pre-processing radar communication data; setting piecewise linear frequency modulation signal parameters; generating piecewise linear frequency modulation signals; emitting and receiving pulse modulation signals; detecting the distance and speed of a radar target; demodulating the radar communication data. Piecewise linear frequency modulation signals with a constant envelope and a fixed bandwidth are designed, and data modulation is performed on the time width and frequency modulation polarity of intermediate linear frequency modulation signals to make the signals carry communication information, so that the signals become shared signals that can detect a target and transmit data. The method overcomes the problem of range ambiguity existing in detection by common pulse signals, solves the contradiction between communication transmission and power occupation by radar detection, and is more accurate in transmission and lower in error rate. The method is applied to an integrated radar communication system.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to detection and communication transmission in radar communication, in particular to a method for radar detection and communication transmission based on segmented chirp signals. It is used in radar communication integrated system. Background technique [0002] In order to adapt to the development of information technology in the future, airborne and shipborne platforms reflect the "informatization advantage", which requires the development and use of platforms to have a systematic trend, so that various airborne platforms can realize cross-domain and over-distance communication through electronic information channels. Collaborate in real time. At the same time, in order to adapt to the requirements of the modern information environment, the airborne platform needs to be equipped with a large number of electronic equipment such as radar, communication equipment, etc. The compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40H04L27/10H04L27/12
CPCH04L27/103H04L27/12G01S7/40
Inventor 周宇张诗羽杨慧婷谷亚彬高希
Owner XIDIAN UNIV
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