High-repetitive frequency pulse radar extension distance measurement range waveform design method

A technology of pulse radar and waveform design, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc. It can solve the problems of duty cycle and average power drop, distance ambiguity, etc., and maintain the duty cycle and average power, high duty cycle and average power, the effect of improving the distance measurement range without ambiguity

Active Publication Date: 2017-09-08
HARBIN INST OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of range ambiguity caused by pulse cycle repetition in high-repetition pulse radar, and to avoid the problem of decreasing duty cycle and average power while increasing the range without ambiguity. Waveform Design Method for Extended Ranging Range of Repetitive Pulse Radar

Method used

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  • High-repetitive frequency pulse radar extension distance measurement range waveform design method
  • High-repetitive frequency pulse radar extension distance measurement range waveform design method
  • High-repetitive frequency pulse radar extension distance measurement range waveform design method

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specific Embodiment approach 1

[0019] Specific implementation mode one: a waveform design method for extending the ranging range of a high-repetition pulse radar is implemented according to the following steps:

[0020] High repetition frequency pulse signal can achieve a large range of unambiguous speed measurement, set: 0~V, assuming that the maximum speed of the target in the current detection situation is V 1 , and V 1 < V, the Doppler detection range is partially wasted. At this time, the intra-pulse linear frequency modulation inter-pulse phase modulation pulse signal is used, and the parameters are designed according to the speed relationship, so that the Doppler frequency of the echoes with different folding distances can be moved to different areas, and the echoes with different folding distances can be adjusted in the Doppler dimension. separate.

[0021] The processing process of intra-pulse linear frequency modulation and inter-pulse phase modulation pulse signal is basically the same as that ...

specific Embodiment approach 2

[0026] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in the step one, according to the maximum speed of the target in the radar detection environment is V 1 and the maximum detection speed V of the high repetition frequency pulse signal, the specific process of determining the parameter α, and determining the corresponding relationship between the speed range and the target’s true speed and distance folding times is as follows:

[0027] Assume Take M to be the largest integer smaller than M', and take α=1 / M.

[0028] Assuming that the maximum speed of the target is 1 / M' of the maximum detection speed of Doppler, M is the largest integer smaller than M', so the Doppler range can be divided into M parts, and the echoes with different folding times can be obtained by parameter design. They fall into different areas respectively, and the range of unambiguous ranging is expanded by M times.

[0029] Velocity range for target echo...

specific Embodiment approach 3

[0031] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the second step, according to the α determined in Step 1, the pulse-to-pulse phase modulation is performed on the chirp signal to obtain the intra-pulse chirp pulse-to-pulse phase The specific process of modulating the pulse signal is:

[0032] Such as figure 1 As shown, the signal used in the present invention is an intra-pulse linear frequency modulation inter-pulse phase modulation pulse signal, and the pulse signal adopts a linear frequency modulation pulse. In order to solve the distance ambiguity problem caused by pulse cycle repetition, a secondary phase modulation is performed between the pulse signals. The invention adopts the signal form as follows:

[0033]

[0034]

[0035] Among them, n is the frequency modulation pulse number in the coherent accumulation cycle, N is the number of coherent accumulation cycles, k is the frequency modulation slope, T is the frequency ...

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Abstract

The present invention provides a high-repetitive frequency pulse radar extension distance measurement range waveform design method. The present invention relates to a high-repetitive frequency pulse radar extension distance measurement range waveform design method. The objective of the invention is to solve the problem that the range ambiguity of the high-repetitive frequency pulse radar caused by pulse period repetition and avoid the problem that the duty ratio and the average power are decreased while increasing an unambiguous distance measurement range. The method comprises: 1, determining a corresponding relation of an inter-pulse phase modulation factor [Alpha] and the speed range and a target real speed and the number of times of distance folding; 2, performing inter-pulse phase modulation of linear frequency-modulation pulses, and obtaining intra-pulse linear frequency modulation inter-pulse phase modulation pulse signals; 3, performing radar emission of the intra-pulse linear frequency modulation inter-pulse phase modulation pulse signals, performing distance processing of the received target reflection echo, and obtaining target apparent distance; and 4, performing inter-pulse Doppler processing, and solving the range ambiguity to obtain a target real distance according to a speed result through adoption of inter-pulse Doppler processing. The present invention belongs to the radar signal design and processing field.

Description

technical field [0001] The invention relates to a waveform design method for expanding the ranging range of a high-repetition-frequency pulse radar, and belongs to the field of radar signal design and processing. Background technique [0002] The range folding problem of pulse system radar has always been an important issue concerned by PD radar. The range ambiguity and velocity ambiguity of the pulse-Doppler system radar are an inherent contradiction. Extending the signal period can expand the range of detection, but at the same time it will reduce the range of velocity measurement and cause velocity ambiguity. When the radar detects the target, the long-distance folding echo enters the detection area through the distance folding, submerging the target in the detection area, making target detection difficult. This blurring phenomenon is more obvious in high repetition rate pulse radar. The high repetition frequency signal has a large average power, which can increase the ...

Claims

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Application Information

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IPC IPC(8): G01S13/26
Inventor 位寅生魏文艳张洋许荣庆
Owner HARBIN INST OF TECH
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