A signal receiving and transmitting system for satellite ground station

Abstract

The present invention discloses a signal transceiver system for a satellite ground station, comprising an antenna feed unit, a Ka receiving unit and an L transceiver unit; the Ka receiving unit comprises a first filter, a first amplifier, a mixer, a second filter, a second amplifier, a PLL phase-locked loop, a frequency multiplication filter module and a Ka receiving chip; the L transceiver unit comprises an L transmitting module, an L receiving module and a duplexer, the L transmitting module comprises an L transmitting chip, a third amplifier, a third filter, a fourth amplifier and a fourth filter, the L transceiver unit also comprises a navigation information receiving module, and the navigation information receiving module comprises a seventh amplifier, an eighth filter, an eighth amplifier and a ninth filter. The present invention can realize the signal transceiver of the L band, and also integrates the signal receiving function of the Ka band, and has the advantage of high integration.

Description

Technical Field

[0001] The present invention relates to a satellite ground station, and in particular to a signal receiving and transmitting system for a satellite ground station. Background Art

[0002] There are many types of traditional satellite ground stations, among which small satellite ground stations generally only undertake observation and relay functions. One of the most typical small satellite ground stations is the satellite communication gateway station, whose function is to connect the satellite signal of the satellite communication system with the ground communication network, such as connecting a satellite phone to the ground wired telephone network, or connecting satellite broadband data to the ground optical fiber network. It completes the interpretation and conversion of the satellite communication system signaling protocol and the information exchange with the ground network;

[0003] The signal transceiver system of the satellite ground station plays a very important role in its normal operation. However, the current satellite ground station transceiver system has a relatively single signal receiving band and there are many inconveniences in its application. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a signal transceiver system for a satellite ground station, which can realize L-band signal transceiver and integrate Ka-band signal receiving function, and has the advantage of high integration.

[0005] The object of the present invention is achieved through the following technical solutions: A signal transceiver system for a satellite ground station, comprising an antenna feed unit, a Ka receiving unit and an L transceiver unit;

[0006] The Ka receiving unit includes a first filter, a first amplifier, a mixer, a second filter, a second amplifier, a PLL phase-locked loop, a frequency doubling filter module and a Ka receiving chip; the input end of the first filter receives the Ka band signal from the antenna unit, the output end of the first filter is connected to an input end of the mixer through the first amplifier, the input end of the PLL phase-locked loop receives a reference clock, the output end of the PLL phase-locked loop is connected to another input end of the mixer through the frequency doubling filter module, the mixer mixes the input signal to obtain an intermediate frequency signal, and transmits it to the Ka receiving chip through the second filter and the second amplifier in sequence;

[0007] The L transceiver unit includes an L transmitting module, an L receiving module and a duplexer. The L transmitting module includes an L transmitting chip, a third amplifier, a third filter, a fourth amplifier and a fourth filter. The input end of the third amplifier is connected to the L transmitting chip, and the output end of the third amplifier is connected to the duplexer through the third filter, the fourth amplifier and the fourth filter in sequence. The duplexer is connected to the antenna unit; the L receiving module includes an L receiving chip, a fifth filter, a fifth amplifier, a sixth filter and a sixth amplifier. The input end of the fifth filter receives the L-band signal from the antenna unit, and the output end of the fifth filter is connected to the L receiving chip through the fifth amplifier, the sixth filter and the sixth amplifier in sequence.

[0008] Preferably, the antenna feed unit includes a composite feed and an antenna matched with the composite feed, the antenna is a parabolic antenna, and the composite feed passes through the focus of the bracket parabolic antenna; the composite feed includes a Ka left-handed circularly polarized feed, an L left-handed circularly polarized feed, and an L right-handed circularly polarized feed sealed together by a sealing cover;

[0009] In the Ka receiving unit, the input end of the first filter is connected to the Ka left-hand circular polarization feed source, in the L receiving module, the input end of the fifth filter is connected to the L left-hand circular polarization feed source, and in the L transmitting module, the duplexer is connected to the L right-hand circular polarization feed source.

[0010] Preferably, the frequency multiplication and filtering module includes a frequency multiplier and a seventh filter, the input end of the frequency multiplier is connected to the output end of the PLL phase-locked loop, and the output end of the frequency multiplier is connected to the mixer through the seventh filter. The signal transceiver system also includes a baseband processing unit for generating a baseband transmission signal to transmit to the L transmitting chip, and receiving signals processed by the L receiving chip and the Ka receiving chip. The baseband processing unit adopts an FPGA chip. The L transmitting chip, the L receiving chip and the Ka receiving chip all adopt AD9361.

[0011] The L transceiver unit also includes a navigation information receiving module, which includes a seventh amplifier, an eighth filter, an eighth amplifier and a ninth filter. The input end of the seventh amplifier is connected to the antenna unit through the duplexer to receive the satellite navigation signal from the antenna unit. The output end of the seventh amplifier is connected to the navigation signal output port through the eighth filter, the eighth amplifier and the ninth filter in sequence. The navigation signal output port is used to connect to an external navigation information acquisition card.

[0012] The beneficial effects of the present invention are as follows: the present invention can realize L-band signal reception and transmission, and also integrates Ka-band signal reception function, and has the advantage of high integration; at the same time, in the process of communicating with the satellite, it can also realize the collection of navigation signals, and is particularly suitable for mobile satellite ground stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a principle block diagram of the present invention;

[0014] Figure 2 This is the principle block diagram of the Ka receiving unit;

[0015] Figure 3 It is the principle block diagram of L transceiver unit;

[0016] Figure 4 A schematic diagram of the layout of a composite feed in an embodiment;

[0017] Figure 5 Schematic diagram of the principle of left-handed circular polarization in the L band in the embodiment. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0019] like Figures 1 to 3 As shown, a signal transceiver system for a satellite ground station includes an antenna feed unit, a Ka receiving unit and an L transceiver unit;

[0020] The Ka receiving unit includes a first filter, a first amplifier, a mixer, a second filter, a second amplifier, a PLL phase-locked loop, a frequency doubling filter module and a Ka receiving chip; the input end of the first filter receives the Ka band signal from the antenna unit, the output end of the first filter is connected to an input end of the mixer through the first amplifier, the input end of the PLL phase-locked loop receives a reference clock, the output end of the PLL phase-locked loop is connected to another input end of the mixer through the frequency doubling filter module, the mixer mixes the input signal to obtain an intermediate frequency signal, and transmits it to the Ka receiving chip through the second filter and the second amplifier in sequence;

[0021] The L transceiver unit includes an L transmitting module, an L receiving module and a duplexer. The L transmitting module includes an L transmitting chip, a third amplifier, a third filter, a fourth amplifier and a fourth filter. The input end of the third amplifier is connected to the L transmitting chip, and the output end of the third amplifier is connected to the duplexer through the third filter, the fourth amplifier and the fourth filter in sequence. The duplexer is connected to the antenna unit; the L receiving module includes an L receiving chip, a fifth filter, a fifth amplifier, a sixth filter and a sixth amplifier. The input end of the fifth filter receives the L-band signal from the antenna unit, and the output end of the fifth filter is connected to the L receiving chip through the fifth amplifier, the sixth filter and the sixth amplifier in sequence.

[0022] In an embodiment of the present application, the antenna feed unit includes a composite feed and an antenna matched with the composite feed, the antenna is a parabolic antenna, and the composite feed passes through the focus of the bracket parabolic antenna; the composite feed includes a Ka left-handed circularly polarized feed, an L left-handed circularly polarized feed, and an L right-handed circularly polarized feed sealed together with a sealing cover;

[0023] In the Ka receiving unit, the input end of the first filter is connected to the Ka left-hand circular polarization feed source, in the L receiving module, the input end of the fifth filter is connected to the L left-hand circular polarization feed source, and in the L transmitting module, the duplexer is connected to the L right-hand circular polarization feed source.

[0024] In an embodiment of the present application, the frequency multiplication filter module includes a frequency multiplier and a seventh filter, the input end of the frequency multiplier is connected to the output end of the PLL phase-locked loop, and the output end of the frequency multiplier is connected to the mixer through the seventh filter. The signal transceiver system also includes a baseband processing unit for generating a baseband transmission signal to transmit to the L transmitting chip, and receiving signals processed by the L receiving chip and the Ka receiving chip. The baseband processing unit adopts an FPGA chip. The L transmitting chip, the L receiving chip and the Ka receiving chip all adopt AD9361.

[0025] The L transceiver unit also includes a navigation information receiving module, which includes a seventh amplifier, an eighth filter, an eighth amplifier and a ninth filter. The input end of the seventh amplifier is connected to the antenna unit through the duplexer to receive the satellite navigation signal from the antenna unit. The output end of the seventh amplifier is connected to the navigation signal output port through the eighth filter, the eighth amplifier and the ninth filter in sequence. The navigation signal output port is used to connect to an external navigation information acquisition card.

[0026] In the embodiment of the present application, the Ka left-hand circularly polarized feed is a left-hand circularly polarized feed in the form of a horn, and the L band is composed of four dual-polarized microstrip feeds. Figure 4 As shown, the four dual-polarization microstrip feeds are A, B, C, and D, and the middle feed is a Ka left-hand circularly polarized feed. The principle of left-hand circular polarization in the L band is as follows: Figure 5 As shown in the figure, A and D synthesize and receive horizontal polarized waves, and output horizontal components, which are recorded as: Ex = EmSin (ωt), B and C synthesize and receive vertical polarized waves, and output vertical components, which are recorded as: Ey = EmCos (ωt), and the direction of the synthesized signal is tgθ = Ey / Ex = tg (ωt). This is equivalent to the direction of the electric field rotating at an angular velocity of ωt. When Ex leads Ey by 90° in phase, the electric field vector rotates counterclockwise; when Ex lags Ey by 90° in phase, the electric field vector rotates clockwise; therefore, left-handed circular polarization can be formed.

[0027] The working principle of the present invention is as follows: in the Ka band, the Ka receiving unit filters and amplifies the Ka band signal output by the composite feed source, performs down-conversion, and then filters and amplifies it again before sending it to the Ka receiving chip, which processes the received signal and transmits it to the FPGA chip to complete the signal reception in the Ka band; in the L band: the L receiving unit filters and amplifies the L band signal output by the composite feed source twice before sending it to the L receiving chip, which processes the signal received by the L receiving chip and sends it to the FPGA chip to complete the signal reception in the L band; the signal from the FPGA is sent to the L transmitting chip, and after being amplified and filtered twice, it is fed into the antenna through a duplexer for wireless transmission; that is, the present invention can realize the signal reception and transmission in the L band, and at the same time integrates the signal reception function in the Ka band, and has the advantage of high integration; because the L transceiver unit of the present application also includes a navigation information receiving module, during the communication process with the satellite, it can also realize the collection of navigation signals, which is particularly suitable for mobile satellite ground stations.

[0028] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A signal transceiver system for a satellite ground station, characterized in that: It includes antenna feed unit, Ka receiving unit and L transceiver unit; The Ka receiving unit includes a first filter, a first amplifier, a mixer, a second filter, a second amplifier, a PLL phase-locked loop, a frequency doubling filter module and a Ka receiving chip; the input end of the first filter receives the Ka band signal from the antenna unit, the output end of the first filter is connected to an input end of the mixer through the first amplifier, the input end of the PLL phase-locked loop receives a reference clock, the output end of the PLL phase-locked loop is connected to another input end of the mixer through the frequency doubling filter module, the mixer mixes the input signal to obtain an intermediate frequency signal, and transmits it to the Ka receiving chip through the second filter and the second amplifier in sequence; The L transceiver unit includes an L transmitting module, an L receiving module and a duplexer, the L transmitting module includes an L transmitting chip, a third amplifier, a third filter, a fourth amplifier and a fourth filter, the input end of the third amplifier is connected to the L transmitting chip, the output end of the third amplifier is connected to the duplexer through the third filter, the fourth amplifier and the fourth filter in sequence, and the duplexer is connected to the antenna unit; the L receiving module includes an L receiving chip, a fifth filter, a fifth amplifier, a sixth filter and a sixth amplifier, the input end of the fifth filter receives the L-band signal from the antenna unit, and the output end of the fifth filter is connected to the L receiving chip through the fifth amplifier, the sixth filter and the sixth amplifier in sequence; The antenna feed unit includes a composite feed and an antenna matched with the composite feed, the antenna is a parabolic antenna, and the composite feed passes through the focus of the bracket parabolic antenna; the composite feed includes a Ka left-handed circular polarization feed, an L left-handed circular polarization feed, and an L right-handed circular polarization feed sealed together by a sealing cover; In the Ka receiving unit, the input end of the first filter is connected to the Ka left-hand circular polarization feed source, in the L receiving module, the input end of the fifth filter is connected to the L left-hand circular polarization feed source, and in the L transmitting module, the duplexer is connected to the L right-hand circular polarization feed source; The frequency multiplication and filtering module comprises a frequency multiplier and a seventh filter. The input end of the frequency multiplier is connected to the output end of the PLL phase-locked loop, and the output end of the frequency multiplier is connected to the mixer through the seventh filter.

2. A signal transceiver system for a satellite ground station according to claim 1, characterized in that: The signal transceiver system also includes a baseband processing unit, which is used to generate a baseband transmission signal and transmit it to the L transmission chip, and receive signals processed by the L reception chip and the Ka reception chip.

3. The signal transceiver system for a satellite ground station according to claim 2, characterized in that: The baseband processing unit adopts an FPGA chip.

4. The signal transceiver system for a satellite ground station according to claim 1, characterized in that: The L transmitting chip, the L receiving chip and the Ka receiving chip all adopt AD9361.

5. The signal transceiver system for a satellite ground station according to claim 1, characterized in that: The L transceiver unit also includes a navigation information receiving module, which includes a seventh amplifier, an eighth filter, an eighth amplifier and a ninth filter. The input end of the seventh amplifier is connected to the antenna unit through the duplexer to receive the satellite navigation signal from the antenna unit. The output end of the seventh amplifier is connected to the navigation signal output port through the eighth filter, the eighth amplifier and the ninth filter in sequence. The navigation signal output port is used to connect to an external navigation information acquisition card.

Images