Method of creating spatial navigation field with distributed navigation signal sources

FIELD: physics, navigation.

SUBSTANCE: invention relates to satellite navigation and can be used in testing and inspecting consumer navigation equipment of satellite navigation systems, located in closed or shielded space. The technical result is creating a spatial navigation field in a closed space, shielded from the external environment, which corresponds to the real environment in which the consumer navigation equipment is to be used. The device which carries out said method using a multichannel satellite navigation system signal simulator with spaced-apart signal emitters enables to create a navigation field using spaced-apart navigation signal sources. When the antenna of the consumer navigation equipment being tested moves, amplitude/phase ratios will vary according to the displacement vector.

EFFECT: disclosed method enables to test interference-tolerant navigation receivers equipped with an antenna array which enables to change the antenna directional pattern for radiation coming from certain directions.

3 cl, 2 dwg

 

This invention relates to the field of radio, namely, satellite navigation, and can be used for testing and validation of the navigation user equipment (EmOC) satellite navigation systems (SNS), placed in an enclosed or screened area.

Modern navigation software mobile and stationary objects is mainly based on the use of navigation signals emitted from the navigation of space vehicles (NSV) of the SNA. On the basis of signals received from the navigation apparatus, the user defines its position in space and in time.

High requirements for EmOC quality navigation and time definitions, the speed of their receipt, the reliability in the short-term loss of navigation signals and in other cases, leading to distortion of the data of observation, improvements are required in the method of its verification, for example, in the simulated spatial navigation field.

Currently when checking voltage, widely used methods with the use of simulators navigation signals SNA to form the navigation area, representing a set of simulated signals NSV SNA.

The prior art method for forming the navigation field used is of the simulator signal with one RF output, the navigation signal from which is fed to the input of one of the radiating antenna, "characteristics of the noise suppression in the first sample of the error-correcting apparatus of consumers SRNS GLONASS/GPS adaptive antenna array", Askin NS, Kharisov, VN, Efimenko B.C. and others, "radio engineering", 2010, No. 7, figure 1, which is selected as a prototype. The advantage of this method is simplicity of construction and calibration of the system.

The disadvantage of this method is that when checking voltage at the antenna motion in any point of the working space that hosts voltage, phase ratio of the incoming signals will be constant, the changes will affect only the amplitude of the incoming signals. Consequently the navigation receiver will have the same solution of navigational problems inherent in the simulated model, within the errors of the simulator and the receiver that does not match the real environment of test.

The main object of the invention is the creation of spatial navigation field in a confined space, shielded from the external environment corresponding to the real environment in which you plan to apply NAP.

The problem is solved in that in the method of forming spatial navigation fields with distributed sources of navigat the local signals form a spatial navigation box in the closed space, shielded from the external environment using n-fixed emitters for emitting signals from the IP, and the emitters for emitting signals from IP have a maximum of chart orientation, oriented in the center of an enclosed space, and their phase centers form a hemisphere, which is located inside a region with a navigation field, similar to the external, which makes it possible to determine the location using a conventional navigation receiver, the signal on each emitter served with multi-channel signal simulator, which automatically commute simulated signal emitters that are located in different segments of the hemisphere, which correspond to the azimuth and the elevation angle of the simulated navigation space apparatus and receives a change of the spatial direction of the radiation signal corresponding to the real.

Private significant features are:

connection to the multi-channel signal simulator navigation receiver with antenna, with real navigation area, and the navigation receiver allocates and passes in the multi-channel signal simulator digital information transferred from the Board of the NCA, and thus provide a rigid temporal reference time-scale, multi-channel simulator signal is, the delay in radio frequency (RF) cables in each channel of the multichannel signal simulator compensate with adjustable delay line, form navigation box that corresponds to the external, thus provide a continuous solution of the navigation problem in the transition from external navigation field in the region of the navigation field, located inside a closed shielded space;

- number of channels of the multichannel signal simulator SNA and emitters for emitting signals from the IP of the selected multiple of 4.

The technical result - the formation of spatial navigation field in a confined space, shielded from the external environment, for testing voltage corresponding to the real environment in which you plan to apply NAP.

Figure 1 and figure 2 shows a block diagram of a device implementing the method.

The device in figure 1 contains 1 - multi-channel simulator signals of satellite navigation systems (IP); 2 - anechoic shielded chamber (BACK); 3 - shows the area of formation of spatial navigation field; 4, ..., n-1, n - emitters for emitting signals from the IP, for example the antenna.

The device in figure 2 contains 1 - multi-channel simulator signals of satellite navigation systems (IP); 2 - anechoic shielded chamber (BACK); 3 - specified oblastforumyulia spatial navigation field; 4, ..., n-1, n - emitters for emitting signals from the IP, such as antennas And antenna for receiving signals SNA; MON-navigation receiver for receiving signals of the SNA.

The method of formation of spatial navigation fields with distributed sources of the navigation signals is as follows.

IP (1) generates the signals of the navigation satellites (NCA) GLONASS/GPS/Galileo. For this IC outputs a signal to the antenna for radiation of signals from IP located in the segment corresponding to the elevation angle of the simulated navigation spacecraft. As you move the simulated navigation of the spacecraft on the trajectory of the signal will switch to the appropriate antenna for the radiation of signals from the IP, thereby changing the spatial plane of the radiation signal.

With outputs IP coaxial cables through the signals at the inputs of emitters (n antennas) for the emission of signals from the IP (4 - n-1, n)inside BACK (2), the sight line directed to the area of the formation of spatial navigation field (3). Antenna for radiation of signals from IP located in such a way that the plane of the radiation formed hemisphere. Inside of this hemisphere are formed (3), which forms the navigation area, similar to the external which allows to determine the location using a conventional navigation receiver.

Today the number NSV one GNSS (GLONASS, GPS, Galileo), located within sight of the NAB, and included in the solution of the navigation problem, does not exceed 12 NCA (with a probability of 0.95 for the time period equal to the period of circulation NSV around the Earth). In this regard, the number of RF outputs signal simulator should have equal 12. The number of sub-bands for each of the navigation system does not exceed 3, so each RF output enough to have 4 channels for the formation of the navigation signals of different sub-bands.

The number of channels of signal simulator SNA, which is used in the complex, a multiple of 4.

To implement the method according to paragraph 2, to multi-channel IC (1) is additionally connected navigation receiver (MO) with the antenna (S)located in the real navigation field. The receiver selects the digital information transmitted from the side navigation of the spacecraft, and transmits it via the chain of communication (QI) IP (1). Also the navigation receiver (MO) provides a rigid temporal reference IP (1) chain 1pps. To eliminate the effect of delays in the cables RC...RCP in IP in each channel provides RES studies. The proposed method allows you to create a region of formation of spatial navigation field (3)in which is formed a navigation box that corresponds to the outer and ensure the sustained continuous solution of the navigation problem in the transition from external navigation field in the region of formation of spatial navigation field (3), located inside a closed shielded space.

IP is a multi-channel generator frequency (RF) signals of complex shape. RF signals generated by the signal simulator SNA, similar to the signals of the Agency and comply with the requirements of the interface control documents to the appropriate SNA, for example, the simulator development JSC "KB NAVIS" SN-M-1.

BUCK is a radio-frequency anechoic chamber, walls, ceiling and floor which covers radio-absorbing porous material. The dimensions of the BACK provide the location of the receiving antenna relative to the radiating antennas at distances far field, while in the placement test CASH provided reflectance of not more than -40 dB in the working volume of 6×6×4 m

Antenna for radiation of signals from the IP are passive spiral antenna with frequency range from 1.1 to 1.7 GHz with a gain of 8 to 12 dB, developed by ZAO "KB NAVIS" TDCC.

The navigation receiver is a multi-frequency satellite receiver, for example PSNM developed by ZAO "KB NAVIS".

Antenna for reception of signals SNA is an antenna device capable of receiving signals of GLONASS, GPS, Galileo, for example antenna TDC developed by ZAO "KB N the vis."

Thus, the method of forming the navigation field of satellite navigation systems in a confined space, which is formed of spatial navigation field in a confined space, shielded from the external environment, using fixed emitters for emitting signals from IP located so that their radiation forms a region in which is formed the navigation area, similar to the external, while the signal at each transducer is supplied with multi-channel signal simulator, which automatically switches the simulated signal emitters for emitting signals from the IP corresponding to the elevation angle of the simulated navigation spacecraft. As you move the simulated navigation of a spacecraft on a trajectory, the signal will switch to the corresponding emitter, thereby changing the spatial plane of the radiation signal.

Device using a multi-channel signal simulator SNA with spaced emitters for emitting signals allows you to create a navigation field with spatially distinct sources of navigation signals. Therefore, when moving the antenna test equipment amplitude-phase relations will change in compliance and with the displacement vector. The proposed method makes it possible to test anti-jam navigation receivers, equipped with antenna array, which allows you to change the directivity of the antenna for radiation coming from certain directions.

1. The method of formation of spatial navigation fields with distributed sources of navigation signals, which form a spatial navigation field in a confined space, shielded from the external environment, using n-fixed emitters for emitting signals from multi-channel signal simulator of satellite navigation systems, and emitters for emitting signals from multi-channel signal simulator of satellite navigation systems have a maximum of chart orientation, oriented in the center of an enclosed space, and their phase centers form a hemisphere, which is located inside a region with a navigation field, similar to the real, while the signal at each transducer are served with a multi-channel signal simulator of satellite navigation systems, with which automatically commute simulated signal emitters that are located in different segments of the hemisphere, which correspond to the azimuth and the elevation angle of the simulated navigation spacecraft is get changes in the spatial direction of the radiation signal, the corresponding real.

2. The method according to claim 1, characterized in that it further connected to the multi-channel signal simulator of satellite navigation systems navigation receiver with antenna, with real navigation area, and the navigation receiver allocates and transmits multi-channel simulator signals of satellite navigation systems, digital information transmitted from the side navigation of the spacecraft, and thus provide a rigid temporal reference time-scale, multi-channel signal simulator of satellite navigation systems, the delay in the RF cables for each channel of the multichannel signal simulator of satellite navigation systems compensate by using an adjustable delay line, at the same time provide continuous solution of the navigation problem in the transition from real navigation a field to the navigation field, located inside a closed shielded space.

3. The method according to claim 1, characterized in that the number of channels of the multichannel signal simulator of satellite navigation systems and emitters for emitting signals from multi-channel signal simulator of satellite navigation systems selected multiple of 4.



 

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7 cl, 2 dwg

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3 cl, 3 dwg

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22 cl, 10 dwg, 1 tbl

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EFFECT: increased accuracy of determining location by providing the positioning device with a list of defective signals transmitted by a specific satellite.

29 cl, 6 dwg, 5 tbl

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