KR101651540B1 - A fast and accurate altitude analysis method for IFF Mode C - Google Patents

Abstract

The high-speed IFF Mode C precision altitude analysis method of the present invention is a method in which the IFF Mode C signal collected by the receiver is composed of a set of PDW (Pulse Description Word) including TOA (Time of Arrival), frequency, pulse width, (A), a G code (B), a G code (B), and a G code (B), which are decoded code variables, (C), and sequentially calculates the G code (D), the G code (A), the G code (B), and the G code (C) and stores them as altitude values. In this paper, we propose a method to obtain the altitude information from the analysis of the Gillham Code which constitutes the IFF Mode C using the collected pulses by extracting the final altitude analysis result. Especially, There are features to be found.

Description

A fast and accurate altitude analysis method for IFF Mode C

The present invention relates to a passive electronic monitoring system, and more particularly, to a high speed IFF Mode C precision altitude analysis method applied to a passive electronic monitoring system.

In general, IFF (Identification friend or foe) signal operates in modes 1, 2, 3 / A, 4, C, S and so on. Particularly Mode C includes altitude information of the aircraft.

Therefore, a passive electronic surveillance system collects / analyzes signals for IFF (Identification friend or foe) signals as well as radar, and performs location identification to perform peer identification on mobile aircraft.

For example, a ground station's peer identifier sends an IFF interrogation signal to the mobile aircraft to identify information such as an ID, and receives the aircraft's transpond signal to detect the location of the mobile aircraft.

Korean Patent Publication No. 10-2013-0125216 (November 18, 2013)

However, the ground station receiving the mode C including the code of the aircraft altitude information analyzes the altitude through matching with the altitude information of the altitude information table, so that the altitude analysis is slow and the precision is low due to the table containing the large size and contents .

In view of the above, according to the present invention, the altitude information is calculated from the analysis of the Gillham Code constituting the IFF Mode C using the collected pulses, so that the rapid and accurate altitude analysis can be performed High Speed IFF Mode C It is aimed to provide a method of accurate altitude analysis.

According to another aspect of the present invention, there is provided a method for analyzing a high-speed IFF Mode C altitude analyzing method, the method comprising the steps of: measuring an IFF Mode C signal collected by a receiver using a pulse width modulation (PDW) (A), B, C, and D codes of the Gillham code included in the received pulse string are classified into G code (D) and G code (A), which are decoded code variables, , A G code (B), and a G code (C); A second step of calculating the G code (D) and storing it as an altitude value; A third step of calculating the G code (A) and storing it as an altitude value; A fourth step of calculating the G code (B) and storing it as an altitude value; A fifth step of calculating the G code (C) and storing it as an altitude value; A sixth step of extracting a result of the final altitude analysis using each of the calculated altitude values; .

The A, B, C, and D codes of the Gillham code are information obtained by mapping the altitude information of the aircraft to the A, B, C, and D codes in order to inform the altitude information of the aircraft.

The final altitude analysis result is set to the altitude value of the final flight using the stored altitude information.

The present invention analyzes the Gillham code (A, B, C, D) constituting the IFF Mode C using the collected pulses and analyzes the altitude information of the flying object quickly and accurately, Especially, it can be directly applied to a passive electronic monitoring system that requires real time threat detection because the analysis speed is low with less memory usage compared to existing table matching method.

FIG. 1 is a flowchart of a high-speed IFF Mode C precision altitude analysis method according to the present invention, FIG. 2 is a pulse form of an IFF Mode C signal according to the present invention, to be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

FIG. 1 shows a procedure of a high-speed IFF Mode C precision altitude analysis method according to the present invention. The IFF signal detection method described below is assumed to be implemented through a ground station peer identifier constituting a passive electronic monitoring system or a passive electronic monitoring system. The receiver is a component of a passive electronic surveillance system or a ground station peer identifier.

As shown, an altitude analysis method performed in a passive electronic surveillance system or a ground station peer identifier includes receiving a collection pulse of S100, calculating G code (D) of S200, calculating code (A) of S300G , Calculating G code (B) in S400, calculating G code (C) in S500, and extracting the altitude analysis result in S600.

From this, the altitude analysis method analyzes the Gillham Code (composed of A, B, C, D, hereinafter referred to as 'G code') constituting the IFF Mode C using the collected pulses, Analysis has its characteristics.

2 is a reception pulse train of the IFF Mode C signal 1 and the reception pulse train is composed of F1, C1, A1, C2, A2, C4, X4, X, B1, D1, B2, D2, B4, D4 and F2 . 3 is an elevation calculation flow chart of the high-speed IFF Mode C precision altitude analysis method. The Gillham Code_A (20-1, 20-2), Gillham Code_B (30-1, ..., 30 -4), and Gillham Code_C (40-1, ..., 40-8) constitute a substructure thereof.

For example, the Gillham Code_A (20-1, 20-2) is Gillham Code_A (20-1) with a condition defined as D = 0,3, Gillham Code_A (20-2 ). Gillham Code_B (30-1, 30-2, 30-3, and 30-4) has Gillham Code_B (30-1), D Gillham Code_B (30-2) with the condition defined as A = 1, 0, 3, A = 30-3), Gillham Code_B (30-4) with the condition defined as D = 1,2, A = 5,6,3,0. The Gillham Code_C (40-1, 40-2, 40-3, 40-4, 40-5, 40-6, 40-7, 40-8) is D = 0,3, A = Gillham Code_C (40-1), D = 0,3, A = 0,3,6,5, B = 1,2,7,4 Gillham Code_C (40-3) with the condition defined by Gillham Code_C (40-2), D = 0,3, A = 1,2,7,4, B = Gillham Code_C (40-4), D = 1, 2, A = 4, 7 with the conditions defined as D = 0,3, A = 1,2,7,4, B = 0,3,6,5 , Gillham Code_C (40-5), D = 1, 2, A = 4, 7, 2, 1, B = 1, 2, , Gillham Code_C (40-6) with the condition defined as 4, Dill = 1, 2, A = 5,6,3,0, B = 7), Gillham Code_C (40-8) with the conditions defined as D = 1,2, A = 5,6,3,0, B = 0,3,6,5.

Hereinafter, embodiments of the altitude analysis method of the present invention will be described in detail with reference to FIGS.

More specifically, in step S100, the reception pulses of the IFF Mode C signals are collected by the receiver so as to perform altitude analysis. The received result consists of a set of PDW (Pulse Description Word). The PDW includes Time of Arrival (TOA), frequency, pulse width, and pulse strength information. 2, the reception pulse train is composed of F1, C1, A1, C2, A2, C4, X4, X, B1, D1, B2, D2, B4, D4 and F2. F1 and F2 must be present, X is not used, and the remaining A, B, C, and D codes are used for altitude information.

In this process, the aircraft receiving the transmitted signal maps its altitude information to the A, B, C and D codes in order to inform its altitude information. In this case, the mapping is a method of turning on (present) or turning off (non-existent) corresponding pulses A1 to D4 according to each altitude. Therefore, in order to analyze the altitude information, each pulse (A1 to D4) of the aircraft received by the receiver is decoded and stored in four code variables A, B, C and D. At this time, the altitude variable, which is the altitude information, is set to altitude = 0 for the subsequent altitude calculation.

A, B, C, D Code Decimation formula:

From this, A = 0,1,2,3,6,7,5,4, A = 4,5,7,6,2,3,1,0, and B = 0,1,3, 2,6,5,4, B = 4,5,7,6,2,3,1,0, B = 0,1,3,2,6,7,5,4, B = 4,5, 2, 3, 1, 0, and C = 1, 3, 2, 6, 4, C = , C = 4,6,2,3,1 C = 1,3,2,6,4, C = 4,6,2,3,1, C = 1,3,2,6,4, C = 4, 6, 2, 3, 1, and D is calculated as 0, 1, and 3,

Specifically, the G code (D) calculation step S200 changes the altitude variable by checking D defined in the collection pulse reception (S100) for the altitude value calculation. This changes the altitude by checking the D value in the same way as Table 1, and is defined as Gillham Code_D (10).

D How to change altitude 0 No change One altitude = altitude + 32000 3 altitude = altitude + 32000x2 2 altitude = altitude + 32000x3

As a result of the G code (D) calculation of S200, the altitude value to which the G code (D) calculation is applied can be stored.

Specifically, the G code (A) calculation step of S300 changes the altitude variable by checking A defined in the collection pulse reception (S100) for altitude value calculation. It is defined as Gillham Code_A (20-1) and Gillham Code_A (20-2), respectively, by checking the D and A values at the same time and changing the altitude in the same manner as in Table 2.

D A How to change altitude 0,3 0 No change One altitude = altitude + 4000 3 altitude = altitude + 4000x2 2 altitude = altitude + 4000x3 6 altitude = altitude + 4000x4 7 altitude = altitude + 4000x5 5 altitude = altitude + 4000x6 4 altitude = altitude + 4000x7 1,2 4 No change 5 altitude = altitude + 4000 7 altitude = altitude + 4000x2 6 altitude = altitude + 4000x3 2 altitude = altitude + 4000x4 3 altitude = altitude + 4000x4 One altitude = altitude + 4000x6 0 altitude = altitude + 4000x7

As a result of the calculation of the G code (A) of S300, the altitude value to which the G code (A) calculation is applied can be stored.

Specifically, the G code (B) calculation step of S400 changes the altitude variable by checking B defined in the collection pulse reception (S100) for the altitude value calculation. This is done by checking the values of D, A, and B at the same time and changing the altitude in the same way as Table 3 and changing the altitude by using the Gillham Code_B (30-1), Gillham Code_B (30-2), Gillham Code_B 30-4), respectively.

D A B How to change altitude 0,3 0,3,6,5 0 No change One No change 3 altitude = altitude + 1000 2 altitude = altitude + 1000 6 altitude = altitude + 1000x2 7 altitude = altitude + 1000x2 5 altitude = altitude + 1000x3 4 altitude = altitude + 1000x3 1,2,7,4 4 No change 5 No change 7 altitude = altitude + 1000 6 altitude = altitude + 1000 2 altitude = altitude + 1000x2 3 altitude = altitude + 1000x2 One altitude = altitude + 1000x3 0 altitude = altitude + 1000x3 1,2 4,7,2,1 0 No change One No change 3 altitude = altitude + 1000 2 altitude = altitude + 1000 6 altitude = altitude + 1000x2 7 altitude = altitude + 1000x2 5 altitude = altitude + 1000x3 4 altitude = altitude + 1000x3 5,6,3,0 4 No change 5 No change 7 altitude = altitude + 1000 6 altitude = altitude + 1000 2 altitude = altitude + 1000x2 3 altitude = altitude + 1000x2 One altitude = altitude + 1000x3 0 altitude = altitude + 1000x3

As a result of the calculation of the G code (B) in S400, the altitude value to which the G code (b) calculation is applied can be stored.

Specifically, the G code (C) calculation step of S500 changes the altitude variable by checking B defined in the collection pulse reception (S100) for the altitude value calculation. This is done by checking the values of D, A, B and C at the same time and changing the altitude in the same manner as Table 4, and changing the altitude by using Gillham Code_C (40-1), Gillham Code_C (40-2), Gillham Code_C (40-4), Gillham Code_C (40-5), Gillham Code_C (40-6), Gillham Code_C (40-7), and Gillham Code_C (40-8), respectively.

D A B C How to change altitude 0,3 0,3,6,5 0,3,6,5 One No change 3 altitude = altitude + 100-1200 2 altitude = altitude + 100x2-1200 6 altitude = altitude + 100x3-1200 4 altitude = altitude + 100x4-1200 1,2,7,4 4 No change 6 altitude = altitude + 100-700 2 altitude = altitude + 100x2-700 3 altitude = altitude + 100x3-700 One altitude = altitude + 100x4-700 1,2,7,4 1,2,7,4 One No change 3 altitude = altitude + 100-1200 2 altitude = altitude + 100x2-1200 6 altitude = altitude + 100x3-1200 4 altitude = altitude + 100x4-1200 0,3,6,5 4 No change 6 altitude = altitude + 100-700 2 altitude = altitude + 100x2-700 3 altitude = altitude + 100x3-700 One altitude = altitude + 100x4-700 1,2 4,7,2,1 0,3,6,5 One No change 3 altitude = altitude + 100-1200 2 altitude = altitude + 100x2-1200 6 altitude = altitude + 100x3-1200 4 altitude = altitude + 100x4-1200 1,2,7,4 4 No change 6 altitude = altitude + 100-700 2 altitude = altitude + 100x2-700 3 altitude = altitude + 100x3-700 One altitude = altitude + 100x4-700 5,6,3,0 1,2,7,4 One No change 3 altitude = altitude + 100-1200 2 altitude = altitude + 100x2-1200 6 altitude = altitude + 100x3-1200 4 altitude = altitude + 100x4-1200 0,3,6,5 4 No change 6 altitude = altitude + 100-700 2 altitude = altitude + 100x2-700 3 altitude = altitude + 100x3-700 One altitude = altitude + 100x4-700

As a result of calculation of the G code (C) of S500, an altitude value to which the G code (C) calculation is applied can be stored.

Specifically, the step S600 of extracting the altitude analysis result is a process of extracting the altitude value calculated through the calculation of the G code (D, A, B, C) as a result of the final altitude analysis. For this purpose, the altitude analysis result extraction step extracts the altitude information using the stored altitude information, and the altitude of the final flight object analyzed by receiving the IFF Mode C signal is set to the altitude value.

As described above, in the high-speed IFF Mode C precision altitude analysis method according to the present embodiment, the IFF Mode C signal collected by the receiver includes a Pulse Description (PDW) including Time of Arrival (TOA), frequency, pulse width, (A), a G code (A), and a G code (B), which are decoded code variables, of the Gillham codes included in the received pulse train, (G), the G code (B), and the G code (C) are sequentially calculated and stored as an altitude value by converting the G code (D), the G code The altitude information is calculated from the analysis of the Gillham Code that constructs the IFF Mode C using the collected pulses by extracting the final altitude analysis result using the calculated altitude value. Especially, Filling can be obtained quickly and accurately compared to the table method.

1: IFF Mode C signal
10: Gillham Code_D 20-1, 20-2: Gillham Code_A
30-1, ..., 30-4: Gillham Code_B
40-1, ..., 40-8: Gillham Code_C

Claims (4)

The reception pulse train is organized such that the IFF Mode C signal collected by the receiver is composed of a set of PDWs (Pulse Description Word) including Time of Arrival (TOA), frequency, pulse width and pulse strength information, A first step of converting each of the A, B, C and D codes of the Gillham code into G code (D), G code (A), G code (B) and G code (C), which are decoded code variables;
A second step of calculating the G code (D) and storing it as an altitude value;
A third step of calculating the G code (A) and storing it as an altitude value;
A fourth step of calculating the G code (B) and storing it as an altitude value;
A fifth step of calculating the G code (C) and storing it as an altitude value;
A sixth step of extracting a result of the final altitude analysis using each of the calculated altitude values;
And a high-speed IFF MODE C precision altitude analysis method. The method as claimed in claim 1, wherein the A, B, C, and D codes of the Gillham code are information obtained by mapping the altitude information of the aircraft to A, B, C, and D codes to inform the altitude information of the aircraft, Speed IFF MODE C precision altitude analysis method.
The method of claim 1, wherein the deconvolution of the A, B, C, D code

To a high speed IFF MODE C precision altitude analysis method.
The method of claim 1, wherein the final altitude analysis result is set to an altitude value of the final flight using the stored altitude information.

Images