CN-122017904-A - Navigation signal broadcasting system based on microwave bidirectional time synchronization technology

CN122017904ACN 122017904 ACN122017904 ACN 122017904ACN-122017904-A

Abstract

The invention discloses a navigation signal broadcasting system based on a microwave bidirectional time synchronization technology, which belongs to the field of navigation positioning communication and comprises at least four ground station units distributed in a coverage area, wherein each unit comprises a ground station host, a time system receiving and transmitting antenna and a navigation signal transmitting antenna. The time system receiving and transmitting antenna establishes a bidirectional microwave link between the master station and the slave station, the ground station host adopts a bidirectional one-way pseudo-range measurement technology to realize time synchronization and pseudo-range measurement between stations through the link, generates a navigation message based on a synchronization result, and broadcasts through the navigation signal transmitting antenna after modulation, so that the navigation terminal in the area can still realize positioning when satellite signals are unavailable. The ground station host adopts a modularized portable design, and has high environmental adaptability. The invention solves the problem that the terminal can not be positioned in the satellite signal rejection environment, and provides independent, reliable and rapidly deployed regional navigation capability.

Inventors

SHAO JIE
GONG YANG
ZHANG BIN
WANG LUSHENG
MA XINGCHI
YANG KAIBO

Assignees

北京卫信杰科技发展有限公司

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. A navigation signal broadcasting system based on a microwave bidirectional time synchronization technology, which is characterized by comprising at least four ground station units distributed in a coverage area, wherein each ground station unit comprises a master station and at least three slave stations; Each ground station unit comprises a ground station host, a time system receiving and transmitting antenna and a navigation signal transmitting antenna; The time system receiving and transmitting antenna is used for establishing a bidirectional microwave link between a master station and a slave station, and the ground station host machine realizes the time synchronization between stations and measures the pseudo range between stations by adopting a bidirectional single-pass pseudo range measurement technology through the bidirectional microwave link; the ground station host is also used for generating a navigation message based on a time synchronization result, modulating the navigation message into a navigation signal and broadcasting the navigation signal through the navigation signal transmitting antenna so that a navigation terminal in the coverage area receives the navigation signal to position.
2. The navigation signal broadcasting system based on the microwave bidirectional time synchronization technology according to claim 1, wherein the ground station host is a modularized portable host adopting a split cavity structure, and a sometimes system navigation baseband module, a clock module and a power amplifier module are integrated in the ground station host.
3. The navigation signal broadcasting system based on the microwave two-way time synchronization technology according to claim 2, wherein the clock module is connected to the time system navigation baseband module for providing a reference clock signal and a second pulse signal to the time system navigation baseband module.
4. The navigation signal broadcasting system based on the microwave two-way time synchronization technology of claim 3, wherein the time system navigation baseband module is configured to multiply the reference clock signal to obtain a sampling clock and sample a rising edge of the second pulse signal to determine a full second moment of transmission of the navigation signal.
5. The navigation signal broadcasting system based on the microwave bidirectional time synchronization technology according to claim 2, wherein the time system navigation baseband module is connected with the power amplification module and is used for outputting the modulated intermediate frequency signal and the control signal to the power amplification module, and the power amplification module amplifies the intermediate frequency signal and outputs the amplified intermediate frequency signal to the navigation signal transmitting antenna.
6. The navigation signal broadcasting system based on the microwave bidirectional time synchronization technology according to claim 2, wherein the structural shell of the ground station host adopts an anti-rust aluminum material and is provided with a dustproof, waterproof, heat dissipation and electromagnetic shielding structure.
7. The system of claim 6, wherein the external interface of the ground station host meets IP68 protection level requirements.
8. The navigation signal broadcasting system based on the microwave two-way time synchronization technology according to claim 1, wherein a lightning protection device is arranged at the navigation signal transmitting antenna.
9. The system of claim 4, wherein the timing system navigation baseband module is further configured to control the navigation signal to hop at the full second time of transmission according to a pre-stored hopping pattern.
10. The navigation signal broadcasting system based on the microwave two-way time synchronization technology as set forth in claim 1, wherein the two-way one-way pseudo-range measurement technology is implemented by the master station and the slave station respectively transmitting a forward ranging signal and a reverse ranging signal with their own clocks as references, and measuring the obtained time delays And Said time delay And The following relationships are respectively satisfied: ; ; wherein D is the true distance between the master station and the slave station, For the time delay of the master station, In order for the slave station to be time delayed, For the speed of light, t 12 is the slave one-way propagation delay, t 21 is the master one-way propagation delay, There is a clock difference between the ranging signal frames transmitted for both parties.

Description

Navigation signal broadcasting system based on microwave bidirectional time synchronization technology Technical Field The invention belongs to the technical field of navigation positioning communication, and particularly relates to a navigation signal broadcasting system based on a microwave bidirectional time synchronization technology. Background The global navigation satellite system (Global Navigation SATELLITE SYSTEM, GNSS) is the most widely used navigation positioning technology at present, and continuously transmits a radio signal containing time information to the ground by arranging a plurality of satellites on the earth orbit, and the user receiving equipment calculates the distance between the user receiving equipment and each satellite by receiving signals of at least four satellites and utilizing the signal propagation time difference, and then calculates the position, the speed and the time information of the user receiving equipment by combining the original understanding of the triangular positioning. The technology has the advantages of realizing mature application in the systems of the GPS in the United states, the GLONASS in Russian, the Galileo in Europe, the Beidou in China and the like, being capable of providing continuous and real-time accurate positioning service for a plurality of fields of engineering measurement, transportation, resource investigation, daily navigation and the like in the global scope, along with wide coverage, high positioning precision, convenient use and the like. However, the existing GNSS technology still has a significant limitation in practical application that its positioning function is completely dependent on reliable reception of satellite signals, and when a user is in an environment where satellite signals are blocked, attenuated or intentionally interfered, such as indoor, underground, canyon, urban dense area or combat area affected by electromagnetic countermeasure, satellite signals may not be effectively covered or subject to rejection, resulting in that the navigation terminal cannot receive enough satellite signals and loses positioning capability. Particularly in the scenes of high reliability requirements such as military application, the equipment cannot finish accurate navigation and positioning when satellite signals fail, and the combat effectiveness and task execution are severely restricted. Thus, the prior art lacks an effective means for providing a terminal with a high-precision positioning service under conditions where satellite signals are not available. Disclosure of Invention In order to solve the technical problems, the invention provides a navigation signal broadcasting system based on a microwave bidirectional time synchronization technology, so as to solve the problems in the prior art. To achieve the above object, in a first aspect, the present invention provides a navigation signal broadcasting system based on a microwave bidirectional time synchronization technology, including at least four ground station units disposed in a coverage area, the ground station units including a master station and at least three slave stations; Each ground station unit comprises a ground station host, a time system receiving and transmitting antenna and a navigation signal transmitting antenna; The time system receiving and transmitting antenna is used for establishing a bidirectional microwave link between a master station and a slave station, and the ground station host machine realizes the time synchronization between stations and measures the pseudo range between stations by adopting a bidirectional single-pass pseudo range measurement technology through the bidirectional microwave link; the ground station host is also used for generating a navigation message based on a time synchronization result, modulating the navigation message into a navigation signal and broadcasting the navigation signal through the navigation signal transmitting antenna so that a navigation terminal in the coverage area receives the navigation signal to position. Preferably, the ground station host is a modularized portable host adopting a split cavity structure, and a system navigation baseband module, a clock module and a power amplifier module are integrated in the ground station host. Preferably, the clock module is connected with the timing system navigation baseband module and is used for providing a reference clock signal and a second pulse signal for the timing system navigation baseband module. Preferably, the time system navigation baseband module is configured to multiply the reference clock signal to obtain a sampling clock and sample the rising edge of the second pulse signal to determine the transmitting whole second moment of the navigation signal. Preferably, the time system navigation baseband module is connected with the power amplification module, and is used for outputting the modulated intermediate frequency signal and the control signal t