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Mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals

A phase-encoded signal and mismatch filter technology, applied in the field of radar, can solve the problems of mismatch filter design method without phase-encoded signal, reducing range side lobes, etc.

Active Publication Date: 2015-11-11
XIDIAN UNIV
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Problems solved by technology

However, for a wideband radar system, the signal processing bandwidth is fixed. At this time, it is impossible to reduce the range sidelobe by simply increasing the symbol length. At present, there is no design of a mismatch filter based on a phase-encoded signal for this problem. method

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  • Mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals
  • Mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals
  • Mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals

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Embodiment Construction

[0053] refer to figure 1 , the realization steps of the present invention are as follows.

[0054] Step 1, determine the phase encoding signal s.

[0055] Determining the phase encoding signal s specifically includes the following sub-steps:

[0056] (1a) Set the first phase encoding signal s 1 The symbol length N 1 .

[0057] (1b) According to the first phase encoding s 1 The symbol length N 1 , to determine the symbol length N of the phase-encoded signal s s .

[0058] Among them, N s =b×N 1 , b is the increase multiple of the symbol length of the phase-encoded signal s, and the value of b is an integer, and N h -N s is an even number, N h +N s Also an even number.

[0059] (1c) Set the main lobe width control amount M=fix(δ×b) of the phase encoded signal s.

[0060] Among them, δ is an empirical coefficient, which generally takes a value in the range of (0.5-1.0), and usually takes a value of 0.8; b represents the multiple of the increase in the symbol transm...

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Abstract

The invention belongs to the field of a radar technology, and discloses a mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals. The optimization method comprises the following steps: determining phase coding signals s; according to the phase coding signals s and the length Nh of a mismatch filter h, constructing a target function of the mismatch filter h; constructing a constraint condition of the target function about the mismatch filter h; according to the constraint condition of the target function, solving the target function of the mismatch filter h; and determining the mismatch filter. The method provided by the invention can reduce the distance sidelobe level of the phase coding signals after pulse compression.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically relates to a method for optimizing a mismatch filter of a high code rate and low range resolution phase encoding signal, which is used for reducing the range side lobe level of the phase encoding signal after mismatch filtering. Background technique [0002] The pulse compression technology solves the contradiction between the radar's operating range and range resolution, and has been widely used in the radar field. However, the pulse compression signal usually has a high range side lobe, and the high range side lobe is not conducive to the effective detection of the target by the radar, especially the weak target detection in the background of multiple targets or strong clutter, the main lobe of the weak target It is very easy to be overwhelmed by the range side lobe of the strong target echo, resulting in missed alarms, which affects the detection performance of the radar. For e...

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Application Information

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IPC IPC(8): G01S7/28
CPCG01S7/2813
Inventor 刘宏伟周生华徐磊磊臧会凯曹鼎雷欢
Owner XIDIAN UNIV
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