CN-115618646-B - Method for evaluating influence of different threat source layouts on satellite navigation array receiver

CN115618646BCN 115618646 BCN115618646 BCN 115618646BCN-115618646-B

Abstract

The invention discloses an influence assessment method of different threat source layouts on a satellite navigation array receiver, which comprises the steps of obtaining a protection target point position, GNSS threat source number and configuration parameters, array antenna array element number and threat source configuration parameters, constructing a multi-threat source initial deployment model according to a plurality of threat sources, obtaining a single threat source to multi-threat source effective action range of the threat sources to an array antenna according to the array antenna array element number, the configuration parameters and the threat source configuration parameters, obtaining a combined effective threat region area calculation method of the multi-threat source to the array antenna and a threat signal minimum effective influence distance according to the multi-threat source initial deployment model and the single threat source to multi-threat source effective action range of the threat source to the array antenna, drawing a threat source distance to a protection target point and threat signal effective influence region area function curve, and obtaining an optimal deployment model with the largest threat signal effective influence region area.

Inventors

WEI SHIPENG
MA CHUNJIANG
YUAN MUZI
NI SHAOJIE
LIU WENXIANG
SUN GUANGFU
CHEN FEIQIANG
LV ZHICHENG
YE XIAOZHOU
LU ZUKUN
LI ZONGNAN

Assignees

中国人民解放军国防科技大学

Dates

Publication Date: 20260508
Application Date: 20221108

Claims (8)

1. A method for evaluating the impact of different threat source layouts on satellite navigation array receivers, comprising the steps of: Acquiring the position of a protection target point, the number and configuration parameters of GNSS threat sources, the number of array antenna elements and the configuration parameters of the threat sources; constructing a plane rectangular coordinate system by taking the position of the protection target point as a coordinate origin, and constructing a multi-threat source initial deployment model according to a plurality of threat sources; Obtaining the effective range of the threat source to the single threat source and the multiple threat sources of the array antenna according to the array element number of the array antenna, the configuration parameters and the threat source configuration parameters; acquiring a combined effective threat area calculation method of the multi-threat source to the array antenna and a threat signal minimum effective influence distance according to the multi-threat source initial deployment model and the single threat source to multi-threat source effective action range of the threat source to the array antenna; the j-th threat source has the following threat source action areas in the task area aiming at different suppression capacities of the array receiver on multi-threat signals: where di is the maximum range of the single threat source in the omni-direction under the combined effect of i threat sources of the GNSS threat source under free space propagation; Counting the total number of the effective threat points of the array receiver in the task area, making a ratio with the total number of the task area, and multiplying the ratio by the total area of the task area to obtain the combined effective threat area of the multi-threat source to the array antenna; Finding out the effective threat point of the array receiver closest to the origin of coordinates, wherein the distance between the effective threat point and the origin of coordinates is the minimum effective influence distance of threat signals; and drawing a function curve of the distance between the threat source and the protection target origin and the area of the effective threat signal influence area by a calculation method of the combined effective threat area of the multi-threat source to the array antenna, and obtaining an optimal deployment model with the largest area of the effective threat signal influence area.
2. The method for evaluating the impact of different threat source layouts on a satellite navigation array receiver of claim 1, The configuration parameters of the GNSS threat source comprise the frequency, the signal wavelength, the transmitting antenna gain and the transmitting power of the threat source; The array antenna configuration parameters comprise the interference-signal ratio of the suppression capability of the array antenna to single threat, double threat and even multi-threat signals and the minimum resolution angle of the array antenna to different incoming threat signals.
3. The method of evaluating the impact of different threat source layouts on a satellite navigation array receiver of claim 1, wherein the location of the threat source around the protected target is calculated as follows: Wherein (xj, yj) is the position of the jth threat source in the coordinate system, j represents the number j=1, 2..T of threat sources, I is the number of threat sources in the threat source deployment model , Is the distance of the threat source from the origin of coordinates.
4. The method for evaluating the influence of different threat source layouts on a satellite navigation array receiver according to claim 1, wherein constructing a multi-threat source initial deployment model according to a plurality of threat sources specifically comprises maintaining the same distance between the multi-threat sources and an origin of coordinates with the same included angle, and uniformly distributing the distances around a protection target point to obtain the multi-threat source initial deployment model.
5. The method for evaluating the influence of different threat source layouts on a satellite navigation array receiver according to claim 1, wherein obtaining the single threat source to multiple threat sources effective range of the threat sources to the array antenna according to the array antenna array element number, the configuration parameters and the threat source configuration parameters specifically comprises: Wherein P Jt is threat source transmitting power, G t is transmitting antenna gain, P s is satellite-to-ground signal power, M Ji is suppression capability interference signal ratio of an array receiver against i threat sources, Is the threat source signal wavelength.
6. The method for evaluating the impact of different threat source layouts on a satellite navigation array receiver of claim 1, wherein obtaining a combined effective threat area and a threat signal minimum effective impact distance of multiple threat sources on an array antenna comprises: Taking a protection target point as a center to take an area as a task area, discretizing the task area into a B, grid points in the corresponding areas of threat source and protection target point positions, wherein each grid point corresponds to one to-be-analyzed threat interference point in the task area, so as to obtain an effective threat situation, and a judgment result initializing matrix result_d; And analyzing the combined effective threat area and the minimum effective threat acting distance of the threat sources to the array receivers, judging the combined acting condition of the array receivers at a certain point according to the traversing mode of matrix elements for each to-be-analyzed threat point in the task area, and updating an initial matrix result_d of the effective threat condition judgment result.
7. The method for evaluating the impact of different threat source layouts on a satellite navigation array receiver of claim 6, wherein the combined effective threat area of the multiple threat sources to the array antenna is obtained by calculating, Wherein L, H is the length and width of the task area, a and b are the row and column numbers of the grid, To judge whether the threat source deployment model reaches the Boolean variable of effective threat to a certain point Q in space, if the threat is effective, then Otherwise 。
8. The method for evaluating the impact of different threat source layouts on a satellite navigation array receiver as defined in claim 6, wherein said threat signal minimum effective impact distance comprises: when judging the threat situation of a certain point Q in a space, storing the distance value between the threat point and the origin into a threat action distance matrix D_O, wherein the minimum value position of a nonzero element of the threat action distance matrix D_O is the effective threat point of an array receiver closest to the origin of coordinates in a corresponding task area, and the minimum effective influence distance Qmin of a threat signal is calculated as follows: Wherein, the For the distance between the active threat point and the origin of coordinates for the array receiver nearest to the origin of coordinates within the task area, The array receiver nearest to the origin of coordinates within the task area is effectively the lateral coordinates of the threat point, The array receiver closest to the origin of coordinates within the task area is effectively the longitudinal coordinates of the threat point.

Description

Method for evaluating influence of different threat source layouts on satellite navigation array receiver Technical Field The invention belongs to the technical field of GNSS threat source optimization deployment schemes and implementation strategies, and particularly relates to an influence evaluation method of different threat source layouts on satellite navigation array receivers. Background The adaptive array receiver can effectively inhibit adjacent frequency bands or co-frequency band malicious signals which are different in incoming directions and have the number smaller than the degree of freedom of the array elements, namely signals which threaten normal navigation. In the traditional multi-threat source deployment method, the application ranges of all single threat sources are generally considered to be directly and linearly overlapped, so that a plurality of threat sources can not be reasonably deployed according to the characteristic of the array receiver that different incoming threat signals can be restrained, and the application efficiency of the threat signal sources can not be fully exerted when the array receiver is faced. With the continuous progress of satellite navigation enhancement technology, the signal of the satellite reaching the navigation receiver is enhanced, and under the condition of unchanged power, the effective acting distance of a single threat signal source is shortened, and the acting efficiency of the threat source is reduced. And the development of inertial navigation technology makes the precision of inertial navigation autonomous navigation mode higher and higher. Along with the gradual maturity of the ultra-tight coupling mode of GPS/INS integrated navigation, the suppression capability of the navigation receiver to threat signals is obviously improved. For a receiver of the combined navigation of the guard navigation and the inertial navigation, if the receiver generates expected position deviation after the guard navigation is disabled by the action of the threat signal, the threat signal needs to act far enough. Therefore, in order to achieve the effective function capability of the threat signal of the adaptive array receiver at a relatively long distance, the function efficiency of the threat signal source is fully exerted, and therefore, it is highly desirable to propose a method for evaluating the influence of different threat source layouts on the satellite navigation array receiver. Disclosure of Invention The invention aims to provide an influence evaluation method of different threat source layouts on a satellite navigation array receiver, and solves the problems that the conventional threat signal source deployment method does not consider the fact that the array receiver can form inhibition characteristics on different incoming threat signals when facing the adaptive array receiver, so that the threat sources cannot fully exert the effect, the effective threat area of the deployment mode is small, the minimum threat distance is short, and the array receiver for the satellite navigation inertial navigation combined navigation cannot generate enough navigation deviation. In order to achieve the above object, the present invention provides a method for evaluating the influence of different threat source layouts on a satellite navigation array receiver, comprising the following steps: Acquiring the position of a protection target point, the number and configuration parameters of GNSS threat sources, the number of array antenna elements and the configuration parameters of the threat sources; constructing a plane rectangular coordinate system by taking the position of the protection target point as a coordinate origin, and constructing a multi-threat source initial deployment model according to a plurality of threat sources; Obtaining the effective range of the threat source to the single threat source and the multiple threat sources of the array antenna according to the array element number of the array antenna, the configuration parameters and the threat source configuration parameters; acquiring a combined effective threat area calculation method of the multi-threat source to the array antenna and a threat signal minimum effective influence distance according to the multi-threat source initial deployment model and the single threat source to multi-threat source effective action range of the threat source to the array antenna; and drawing a function curve of the distance between the threat source and the protection target origin and the area of the effective threat signal influence area by a calculation method of the combined effective threat area of the multi-threat source to the array antenna, and obtaining an optimal deployment model with the largest area of the effective threat signal influence area. Optionally, the configuration parameters of the GNSS threat source comprise the frequency, the signal wavelength, the transmitting antenna gain and the tr