CN106950527B

CN106950527B - Pulse signal sorting method under direction-finding system of multi-baseline interferometers

Info

Publication number: CN106950527B
Application number: CN201710245129.2A
Authority: CN
Inventors: 李建军
Original assignee: CETC 2 Research Institute
Current assignee: CETC 2 Research Institute
Priority date: 2017-04-14
Filing date: 2017-04-14
Publication date: 2020-01-31
Anticipated expiration: 2037-04-14
Also published as: CN106950527A

Abstract

The invention discloses a pulse signal sorting method under a multi-baseline interferometer direction-finding system, which specifically comprises the steps of a, calculating a longest baseline phase true value and a corresponding angle, b, calculating a dispersion degree deviation cost function of each baseline phase measured value and the longest baseline phase true value, and marking whether the dispersion degree accords with a phase error limit, c, judging whether each baseline phase measured value forms a target signal direction-finding peak value, if so, determining the direction-finding peak value corresponding angle as an incident angle of a signal, entering a step d, otherwise, judging that a radiation source is not effectively received, finishing the sorting, d, correcting the phase error limit, extracting a pulse sequence of which the dispersion degree corresponding to the incident angle accords with a corrected phase error limit, and carrying out pulse signal sorting.

Description

Pulse signal sorting method under direction-finding system of multi-baseline interferometers

Technical Field

The invention relates to the field of passive electronic reconnaissance, in particular to a pulse signal sorting method under the direction-finding system of multi-baseline interferometers.

Background

In the field of passive electronic reconnaissance, performs parameter measurement and direction finding on a pulse sequence to form a full pulse descriptor, analyzes direction-finding angles with many signals according to a direction-finding aggregation result or a direction-finding histogram, and performs steps to perform sorting of pulse sequence parameter characteristics of the angles, namely sorting of pulse signals, the sorting of signals is relatively easy because of the separation of direction-finding angles of the multiple signals.

In order to avoid wrong direction finding results as much as possible, a scholars propose to calculate a cost function by analyzing the dispersion of phases of multiple baselines, compare the cost function with a preset limit and identify and reject results with high ambiguity probability (see a document: improved correlation interferometer direction finding algorithm, heavy surge, yellow light, high yield; electronic information countermeasure technology, 2016, 31(1), 4-7) in order to ensure better direction finding ambiguity suppression effect, a strict cost function limit is set, which inevitably leads to rejection of more pulses.

In summary, in the current reconnaissance system for multi-baseline interferometer direction finding, it is difficult to avoid direction finding blur and extract sequence features completely.

Disclosure of Invention

Aiming at the problems, pulse signal sorting methods under a multi-baseline interferometer direction-finding system are provided, which can effectively avoid direction-finding ambiguity, give consideration to the completeness of a pulse sequence and avoid large-probability pulse leakage.

The technical scheme adopted by the invention is as follows:

pulse signal sorting method under multi-baseline interferometer direction-finding system includes,

a. calculating a phase true value and a corresponding angle of a longest baseline;

b. calculating a discrete degree deviation cost function of each baseline phase measured value and the longest baseline phase true value, and marking whether the discrete degree meets the limit of phase error ;

c. d, judging whether the measured value of each baseline phase forms a target signal direction-finding peak value, if so, determining the angle corresponding to the direction-finding peak value as the incident angle of the signal, entering the step d, otherwise, judging that the radiation source is not effectively received, and finishing the sorting;

d. and (5) correcting the phase error within , and extracting a pulse sequence with the dispersion degree corresponding to the incident angle meeting the corrected phase error within to perform pulse signal sorting.

, in step c, it is determined whether the baseline phase measurements form the target signal direction-finding peak by counting whether the number of pulses whose dispersion degree meets the phase error limit reaches the pulse number threshold.

, in step c, it can be determined whether the baseline phase measurement value forms the peak of the target signal direction by counting whether the number of the flags whose dispersion degree meets the phase error limit reaches the pulse number threshold.

Further , amplifying the phase error limit in step d.

, the phase error limit can be abandoned in the step d, and all pulse sequences corresponding to the incident angle are extracted for pulse signal sorting.

In conclusion, by adopting the technical scheme, the method has the advantages that after the incident angle corresponding to the target signal direction-finding peak value is determined, the phase error is corrected for limits, the pulse sequence with the dispersion degree corresponding to the incident angle meeting the corrected phase error of limits is extracted for sorting, the integrity of the pulse sequence can be ensured on the premise of avoiding the radiation source direction-finding fuzzy result, and step-by-step signal sorting is facilitated at the rear end.

Drawings

The present invention will now be described, by way of example, with reference to the accompanying drawings, in which figure 1 is a flow chart of a pulse signal sorting method provided by the present invention.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any of the features disclosed in this specification may be replaced by alternative features serving an equivalent or similar purpose unless expressly stated otherwise, i.e. each feature is simply examples of the series of equivalent or similar features unless expressly stated otherwise.

As shown in fig. 1, the pulse signal sorting method under the multi-baseline interferometer direction-finding system specifically includes,

The fuzzy solving algorithm and the existing algorithm of the error cost function calculation related to the method can refer to other technical documents (for example, improved correlation interferometer direction-finding algorithm' Gong billow, yellow light plain and high yield; electronic information countermeasure technology, 2016, 31(1), 4-7).

In the step c, whether the baseline phase measurement value forms a target signal direction finding peak value is judged by counting whether the pulse number of which the dispersion degree accords with the phase error limit reaches a pulse number threshold value, and whether the baseline phase measurement value forms the target signal direction finding peak value is also judged by counting whether the mark number of which the dispersion degree accords with the phase error limit reaches the pulse number threshold value.

And d, correcting the phase error to be limit, extracting the pulse sequence with the dispersion degree corresponding to the incident angle meeting the corrected phase error limit to perform pulse signal sorting, amplifying the phase error limit, wherein the number of the pulse sequence with the dispersion degree meeting the corrected phase error limit is increased, the phase error limit can be abandoned in the step d, all the pulse sequences corresponding to the incident angle are extracted to perform pulse signal sorting, and the phase error limit is amplified or abandoned, so that the integrity of the pulse sequences can be ensured on the premise of avoiding the radiation source direction finding fuzzy result.

The pulse number threshold value needs to be set according to the specific situation of the detection system, the high repetition frequency signal pulse number threshold value can be set to be a larger value, for example, 1KHz repetition frequency signals, the pulse number threshold value is set to be 800, and 20% of pulses are allowed to be lost. The pulse count threshold may be set to a smaller value when the signal is not a high repetition frequency signal or even a continuous detection.

The invention extends to any novel feature or any novel combination disclosed in this specification and any novel method or process steps or any novel combination disclosed in .

Claims

1, pulse signal sorting method under multi-baseline interferometer direction-finding system, which is characterized by comprising the following steps,

b. a discrete degree deviation cost function of each baseline phase measurement from the longest baseline phase truth is calculated,

and marks whether the dispersion level meets the limit of phase error;

d. and c, judging whether each baseline phase measurement value forms a target signal direction finding peak value or not by counting whether the number of pulses or the number of marks of which the dispersion degrees accord with the phase error limit reaches a pulse number threshold value or not.

2. The method for sorting the pulse signals under the multi-baseline interferometer direction-finding systems according to claim 1, wherein the amplified phase error in step d is -limit.

3. The method for sorting the pulse signals under the multi-baseline interferometer direction-finding systems according to claim 1, wherein in the step d, the phase error limit can be abandoned, and all the pulse sequences corresponding to the incident angles are extracted for sorting the pulse signals.