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CW pulse narrow band tracking filter and its tracking filter method

A tracking filter and tracking filtering technology, applied in instruments, measuring devices, spectrum analysis, etc., can solve the problems of signal loss of lock, unsuitable for CW pulse signal tracking filtering, etc., to reduce the search time and reduce the amount of calculation.

Inactive Publication Date: 2007-10-03
HARBIN ENG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for tracking and filtering the CW pulse signal in order to overcome the problem that the existing tracking filter is not suitable for tracking and filtering the CW pulse signal
This method solves the problem that the traditional tracking filter automatically tracks the noise and loses lock on the signal during the intermittent period of the pulse signal. The filtering parameters such as the bandwidth and search speed of the tracking filter of the present invention can be adjusted online, and can realize extremely narrowband filtering

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  • CW pulse narrow band tracking filter and its tracking filter method

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Embodiment Construction

[0011] The circuit devices adopted in the CW pulse tracking filter method of the present invention are common devices that can be purchased on the market; wherein the controllable filter circuit [1] selects a switched capacitor filter, such as MAX264; the A / D converter [2] selects Bidirectional A / D converter, such as A / D7899; signal processing circuit [3] is composed of integrated digital signal processing chip (DSP chip) circuit, such as TMS320VC5509 or TMS320VC6416. Its digital filtering algorithm adopts finite impulse response filtering algorithm or adaptive filtering method; the calculation method of tracking signal frequency adopts recursive filtering algorithm.

[0012] The tracking filtering method of the present invention is: at first the passband of the controllable filtering circuit [1] is set to the maximum bandwidth of the input signal; then the signal processing circuit [3] collects the signal through the A / D converter [2], and collects The final signal is digital...

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Abstract

The present invention is CW pulse narrow band tracking filter and its tracking filter method. The tracking filter includes one controllable filter circuit, one A / D converter and one signal processing circuit. In the signal processing circuit, signal is acquired, filtered digitally and resolved to obtain the frequency and period time of the signal; and resolved frequency is then used in controlling the central frequency and bandwidth of the controllable filter circuit, so as to realize the tracking filtering on CW pulse. The present invention is superior to traditional tracking filter, which tends to track noise automatically in the pulse signal interval to loss lock on signal. The present invention adopts variable bandwidth frequency hopping search mode and sampling based on echo time, and thus has reduced operation amount and capacity of performing tracking filter in low S / N ratio. The present invention is suitable for tracking filter on both CW pulse signal and continuous signal.

Description

technical field [0001] The invention belongs to a narrow-band tracking filter of CW pulse and a tracking filtering method thereof. Background technique [0002] Doppler velocimetry is a commonly used technique for measuring the velocity of a moving target. The Doppler log has two working modes: water tracking and bottom tracking. In the case of large depths, the amplitude of the bottom tracking echo signal will be very small. Similarly, when tracking water, the signal amplitude is also very small. In order to improve the signal-to-noise ratio, the signal needs to be filtered. Although the frequency range of the Doppler speed measurement system is very large, the moving speed of the carrier is certain within a certain period of time, so the frequency of the echo signal changes very little within a certain period of time. In this way, we can use the tracking filter to make the passband of the system very narrow, thereby reducing the interference and noise very low. [0003]...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165
Inventor 卢逢春郑翠娥李想兰华林吕云飞曹忠义
Owner HARBIN ENG UNIV
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