Mode5 preamble pulse jitter value calculation method and system based on constrained least square algorithm

A technique of least squares and pulse jitter, applied in the field of intelligence and reconnaissance, can solve problems such as unsatisfactory and large root mean square error of jitter values, and achieve the effects of large processing bandwidth, stable operation, and high data throughput rate

Active Publication Date: 2021-07-16
深圳华创电科技术有限公司
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Problems solved by technology

[0005] For the measurement of the leading pulse jitter value, when the in-band signal-to-noise ratio is below 10dB, the conventional method uses the time-of-arrival (ToA) of the single pulse and then calculates the difference. Needs in the Field of Individual Identification

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  • Mode5 preamble pulse jitter value calculation method and system based on constrained least square algorithm
  • Mode5 preamble pulse jitter value calculation method and system based on constrained least square algorithm
  • Mode5 preamble pulse jitter value calculation method and system based on constrained least square algorithm

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Embodiment Construction

[0048] The time difference calculation method of the mode5 lead-on pulse shake value calculation method based on constraint minimum two-multiplying algorithm is based on constraints. figure 1 Down:

[0049]1) Collection AD is sampled in real time to obtain original sampling data, and the original sampling data is simultaneously slidable in real time in FPGA; acquisition AD preferably 200 mspsad's IFF signal of @ 140MHz intermediate frequency is sampled.

[0050] 2) The original sampling data is converted to the frequency domain by the FFT operation, and then the CFAR, the ambient noise detection and communication signal adaptive suppression is obtained, and the time-frequency domain guidance information is obtained; the time-frequency domain guidance information is passed down. In the time domain, accurate parameter measurement is performed, and the burst information includes the burst information including the pulse train, pulse, pulse, pulse amplitude AMP, respective pulse width...

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Abstract

The invention discloses a Mode5 preamble pulse jitter value calculation method and system based on a constrained least square algorithm. The method specifically comprises the following steps: firstly, sampling an IFF signal in real time to obtain original sampling data, and synchronizing sliding delay; frequency domain signal detection and time domain parameter measurement are carried out on original sampling data to obtain pulse string information, and then a tree structure is used to judge whether a signal is a Mode5 signal. If the judgment is successful, carrying out accurate time delay on the original sampling data, and respectively carrying out FFT (Fast Fourier Transform) on the data after the synchronous sliding time delay and the accurate time delay to obtain a complex number result; and carrying out conjugate multiplication on the complex results to obtain a cross-correlation spectrum, finally calculating the arc tangent of the cross-correlation spectrum by using a CORDIC algorithm, carrying out phase ambiguity resolution processing on the arc tangent result in a system detection range, and carrying out linear fitting on the processing result by using an RLS algorithm to obtain a preamble pulse jitter value of the Mode5 signal. The calculated leading pulse jitter value is high in precision and good in robustness, the signal individual recognition technology can be supported, and the reconnaissance requirement of recognition friend or foe equipment at the present stage is met.

Description

Technical field [0001] The present invention relates to the field of intelligence reconnaissance in electronic counterfeit, and in particular, a method and system for calculating a MODE5 lead-on pulse shake value based on constraint minimum quadrature algorithm. Background technique [0002] Mark Xiia enemy Identification system is a Upgrade version of Mark XII, adding MODE5 on the original basis. The Mode5 system uses safety information format and data transmission technology to improve system security, anti-interference, and battlefield sense capabilities, which can be used as air-to-ground, empty, air-to-air, sea facing sea. Currently, the military monitoring platform of the US military and NATO Allies, such as E-3B AWACS, E-2C early warning machine, the Aegis war system has equipped MODE5 system, other air, ground and water combat platform IFF system is gradually upgrading to MODE5 system . [0003] The Model Typical feature is a leading pulse with password information and ji...

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Application Information

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IPC IPC(8): G06F17/18G06F17/14G06K9/00
CPCG06F17/18G06F17/142G06F2218/12
Inventor 朱波赵昱杰
Owner 深圳华创电科技术有限公司
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