Satellite navigation signal receiver and method for testing a radio frequency channel thereof

Abstract

The application discloses a satellite navigation signal receiver and a radio frequency channel test method thereof, and relates to the technical field of satellite navigation. The satellite navigation signal receiver comprises a receiver signal input port, a radio frequency baseband integrated chip, a receiver signal output port and a radio frequency channel test circuit. The radio frequency baseband integrated chip comprises a radio frequency down-conversion module, an analog-to-digital conversion module and a baseband signal processing module. The receiver signal output port is connected with the baseband signal processing module. The receiver signal input port, the radio frequency down-conversion module, the analog-to-digital conversion module, the baseband signal processing module and the receiver signal output port are connected to form the radio frequency channel test circuit. The receiver signal output port is used for connecting a test device, so that the test device determines the radio frequency channel performance of the receiver according to a test signal transmitted by the radio frequency channel test circuit. The receiver can realize radio frequency channel performance test, satellite navigation signal acquisition and tracking based on the radio frequency channel test circuit, and meet the low-cost and miniaturized design requirements of the chip and the receiver.

Description

Technical Field

[0001] This application relates to the field of satellite navigation technology, specifically to a satellite navigation signal receiver and its radio frequency channel testing method. Background Technology

[0002] The BeiDou-3 Global Navigation Satellite System has been officially launched, and its applications across various industries will become increasingly widespread and in-depth. In particular, civilian point positioning and high-precision positioning place extremely high demands on receiver size, power consumption, and cost. Therefore, receivers need to adopt a design that differs from traditional frequency chip solutions, using an integrated SOC (System-on-Chip) chip. However, to ensure excellent receiver performance, the SOC chip's performance must meet the usage requirements; therefore, RF channel performance testing is crucial. Thus, it is necessary to estimate the RF channel performance of receivers designed using SOC chips. Summary of the Invention

[0003] The purpose of this application is to provide a satellite navigation signal receiver and its radio frequency channel testing method to solve the technical problem of how to implement radio frequency channel performance testing in the prior art.

[0004] To achieve the above objectives, the first aspect of this application provides a satellite navigation signal receiver, comprising:

[0005] Receiver signal input port;

[0006] The integrated RF baseband chip includes an RF downconversion module, an analog-to-digital converter module, and a baseband signal processing module. The RF downconversion module is connected to the receiver signal input port, the analog-to-digital converter module is connected to the RF downconversion module, and the baseband signal processing module is connected to the analog-to-digital converter module.

[0007] The receiver signal output port is connected to the baseband signal processing module; the receiver signal input port, RF downconversion module, analog-to-digital conversion module, baseband signal processing module, and receiver signal output port are connected to form the RF channel test circuit; the receiver signal output port is used to connect to the test equipment so that the test equipment can determine the RF channel performance of the receiver based on the test signal transmitted by the RF channel test circuit.

[0008] The second aspect of this application provides a method for testing the radio frequency (RF) channel of a satellite navigation signal receiver, applied to the satellite navigation signal receiver provided in the first aspect of this application. The receiver's signal input port is connected to a test signal generation device, and the receiver's signal output port is connected to a test equipment. The RF channel testing method includes:

[0009] The test signal generation device generates and sends a test radio frequency single-carrier signal to the receiver signal input port;

[0010] The RF channel test circuit processes the RF single-carrier signal for testing to obtain the digital intermediate frequency signal for testing, and transmits the digital intermediate frequency signal for testing to the test equipment through the receiver signal output port.

[0011] The test equipment determines the RF channel performance of the receiver based on the digital intermediate frequency signal used for testing.

[0012] In this embodiment, the RF channel test circuit processes the test RF single-carrier signal to obtain a test digital intermediate frequency (IF) signal, and transmits the test IF signal to the test equipment through the receiver signal output port. This includes: an RF down-conversion module receiving the test RF single-carrier signal and processing it at the target local oscillator phase-locked loop (PLL) output frequency and target amplifier gain to obtain the test IF signal; an analog-to-digital conversion module acquiring and processing the test IF signal to obtain the test digital IF signal, and transmitting the test digital IF signal to the baseband signal processing module; the baseband signal processing module forwarding the test digital IF signal to the receiver signal output port and transmitting it to the test equipment through the receiver signal output port; and the test equipment determining the receiver's RF channel performance based on the test digital IF signal, including: the test equipment determining the receiver's RF channel performance at the target local oscillator PLL output frequency and target amplifier gain based on the test digital IF signal.

[0013] In this embodiment, the test equipment determines the RF channel performance of the receiver under the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the test digital intermediate frequency signal, including: processing the test digital intermediate frequency signal using fast Fourier transform to obtain the frequency domain signal of the test intermediate frequency signal; determining the target power parameter in the frequency domain signal of the intermediate frequency signal; and determining the performance test index of the receiver under the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the target power parameter.

[0014] In this embodiment of the application, the target power parameter includes spurious power, and the performance test index includes spurious equivalent power; determining the target power parameter in the frequency domain signal of the intermediate frequency signal includes: determining the spurious power of the spurious signal outside the frequency of the test radio frequency single carrier signal based on the frequency domain signal of the intermediate frequency signal; and determining the spurious equivalent power of the receiver under the conditions of the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the spurious power.

[0015] In this embodiment, the target power parameter includes the intermediate frequency (IF) single-carrier power, and the performance test index includes the noise figure. Determining the target power parameter in the frequency domain signal of the IF signal includes: determining the IF single-carrier power based on the frequency domain signal; determining the performance test index of the receiver at the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the target power parameter, including: acquiring the power of the test radio frequency (RF) single-carrier signal; determining the RF channel gain of the RF channel based on the IF single-carrier power and the power of the RF single-carrier signal; acquiring the noise signal transmitted at the receiver signal output port when there is no signal input at the receiver signal input port; determining the noise power based on the frequency domain signal of the noise signal obtained by fast Fourier processing, and determining the amplified thermal noise power of the RF channel based on the preset thermal noise power and the RF channel gain; and determining the noise figure of the RF channel based on the noise power and the amplified thermal noise power of the RF channel.

[0016] In this embodiment of the application, determining the noise figure of the radio frequency channel based on the noise power and the thermal noise power after amplification of the radio frequency channel includes: determining the difference between the noise power and the thermal noise power after amplification of the radio frequency channel as the noise figure of the radio frequency channel.

[0017] In this embodiment, the target local oscillator (LO) phase-locked loop (PLL) output frequency and the target amplifier gain are determined by the test equipment controlling the RF down-conversion module. The target LO PLL output frequency and the target amplifier gain are selected from multiple preset frequencies and multiple preset gains. The RF channel testing method further includes: after determining the receiver's RF channel performance under the target LO PLL output frequency and the target amplifier gain, the test equipment controls the RF down-conversion module to redetermine the target LO PLL output frequency and the target amplifier gain of the RF down-conversion module until the target LO PLL output frequency and the target amplifier gain of the RF down-conversion module have traversed all combinations of multiple preset frequencies and multiple preset gains; when the target LO PLL output frequency and the target amplifier gain of the RF down-conversion module are redetermined, the test equipment acquires a test digital intermediate frequency (IF) signal through the receiver signal output port; the test equipment determines the receiver's RF channel performance under the redetermined target LO PLL output frequency and the target amplifier gain based on the test digital IF signal.

[0018] In this embodiment, the satellite navigation signal receiver further includes a power divider and multiple filters. The power divider includes an input port and multiple power divider output ports, and the multiple filters are configured one-to-one with the multiple power divider output ports. The RF downconversion module is connected to the receiver signal input port, including: the power divider input port is connected to the receiver signal input port, and each power divider output port is connected to the RF downconversion module through its corresponding filter; wherein, each power divider output port is used to output an RF signal at a frequency point, and the RF single-carrier signal is selected from multiple preset signals, and the multiple preset signals are configured one-to-one with the frequency points of the multiple power divider output ports; the RF channel testing method further includes: after the test equipment determines the RF channel performance of the receiver based on the test digital intermediate frequency signal, the receiver signal input port re-receives the test RF single-carrier signal until the receiver signal input port has traversed and received multiple preset signals; when re-receiving the test RF single-carrier signal, the test equipment obtains the test digital intermediate frequency signal through the receiver signal output port; the test equipment determines the RF channel performance of the receiver when the receiver re-receives the test RF single-carrier signal based on the test digital intermediate frequency signal.

[0019] A third aspect of this application provides a test apparatus for a satellite navigation signal receiver, including a processor configured to retrieve instructions from memory and, when executing the instructions, to implement the radio frequency channel test method for a satellite navigation signal receiver provided in the second aspect of this application.

[0020] The fourth aspect of this application provides a machine-readable storage medium storing instructions for causing a machine to perform a radio frequency channel test method for a satellite navigation signal receiver according to the second aspect of this application.

[0021] Through the above technical solution, the satellite navigation signal receiver provided in this application embodiment can be based on the receiver signal input port, RF down-conversion module, analog-to-digital conversion module, baseband signal processing module and receiver signal output port to form an RF channel test circuit to realize RF channel performance testing and satellite navigation signal acquisition and tracking. This can avoid increasing chip size, chip pin count and satellite navigation signal receiver output port, which is conducive to low-cost miniaturization design of chip and satellite navigation signal receiver as a whole. Moreover, the test results obtained from RF channel testing can reflect the RF channel performance of the integrated RF baseband chip in actual use in the satellite navigation signal receiver.

[0022] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0024] Figure 1 The schematic diagram illustrates the structure of a satellite navigation signal receiver according to an embodiment of this application;

[0025] Figure 2 This illustration schematically shows a structural diagram of another satellite navigation signal receiver according to an embodiment of this application;

[0026] Figure 3 The illustration shows a flowchart of a radio frequency channel testing method for a satellite navigation signal receiver according to an embodiment of this application;

[0027] Figure 4 The illustration shows a flowchart of another radio frequency channel testing method for a satellite navigation signal receiver according to an embodiment of this application;

[0028] Figure 5 This schematic diagram illustrates the structure of a satellite navigation signal receiver according to an embodiment of this application under radio frequency channel testing conditions;

[0029] Figure 6 The illustration shows a flowchart of a method for determining the radio frequency channel noise figure for a satellite navigation signal receiver according to an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0032] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0034] Conventional RF channel testing requires mounting the RF chip on a test board and connecting it to the board's input and output interfaces. A test signal is then sent from a signal source to the test board's input interface, and after passing through the RF chip, it is output to a spectrum analyzer. The spectrum analyzer then analyzes and processes the signal to test the RF channel performance of the RF chip. However, because the structure of a System-on-a-Chip (SoC) differs from that of a single RF chip, the aforementioned conventional RF channel performance testing methods cannot be directly used to test the RF channel performance of an SoC. Therefore, in situations where satellite navigation signal receivers require the use of SoC chips, this application provides a satellite navigation signal receiver and a method for testing its RF channel performance. The SoC chip in the satellite navigation signal receiver provided in this application is an integrated RF baseband chip. This satellite navigation signal receiver can be directly used for RF channel testing, enabling miniaturization, low power consumption, and low cost while directly testing the RF channel performance of the integrated RF baseband chip.

[0035] Figure 1 The schematic diagram illustrates the structure of a satellite navigation signal receiver according to an embodiment of this application. The satellite navigation signal receiver includes: a receiver signal input port, an integrated radio frequency baseband chip, and a receiver signal output port.

[0036] The integrated RF baseband chip includes an RF downconversion module, an analog-to-digital converter module, and a baseband signal processing module. The RF downconversion module is connected to the receiver signal input port, the analog-to-digital converter module is connected to the RF downconversion module, and the baseband signal processing module is connected to the analog-to-digital converter module.

[0037] The receiver signal output port connects to the baseband signal processing module; the receiver signal input port, RF down-conversion module, analog-to-digital converter module, baseband signal processing module, and receiver signal output port together constitute the RF channel test circuit. The receiver signal output port is used to connect to test equipment, enabling the test equipment to determine the receiver's RF channel performance based on the test signals transmitted by the RF channel test circuit.

[0038] The satellite navigation signal receiver provided in this application embodiment can be used in the process of RF channel performance testing. During the RF channel performance testing process, the test signal passes through an RF channel test circuit consisting of a receiver signal input port, an RF down-conversion module, an analog-to-digital converter module, a baseband signal processing module, and a receiver signal output port before reaching the test equipment. After processing by the test equipment, the RF channel performance of the integrated RF baseband chip based on the satellite navigation signal receiver test can be obtained. The above-described satellite navigation signal receiver can directly achieve RF channel performance testing without the need for a traditional test board. Furthermore, since the RF channel test circuit of the satellite navigation signal receiver includes an RF down-conversion module, an analog-to-digital converter module, and a baseband signal processing module, when the satellite navigation signal receiver is receiving satellite navigation signals normally, it can achieve down-conversion and baseband signal processing of the satellite navigation signals through this RF channel test circuit, thereby realizing the acquisition and tracking of satellite navigation signals.

[0039] Therefore, the satellite navigation signal receiver provided in this application embodiment can realize the RF channel testing function and the acquisition and tracking of satellite navigation signals through the RF channel test circuit. The RF channel testing of the integrated RF baseband chip does not require an additional test board, nor does it require additional circuitry in the RF downconversion module or additional ports on the satellite navigation signal receiver specifically for RF channel testing. Thus, the satellite navigation signal receiver provided in this application embodiment, while enabling RF channel testing, facilitates the simplified design of the integrated RF baseband chip, avoiding increases in chip size, pin count, and output ports, thereby promoting low-cost miniaturization of the chip and the satellite navigation signal receiver.

[0040] Since the satellite navigation signal receiver provided in this application embodiment transmits the test signal used for RF channel performance testing through the RF channel test circuit, and the RF channel test circuit includes an RF down-conversion module, an analog-to-digital conversion module, and a baseband signal processing module, the RF channel test circuit can be used for satellite navigation signal acquisition and tracking. Therefore, the test results obtained by performing RF channel testing based on the satellite navigation signal receiver provided in this application embodiment can reflect the RF channel performance of the integrated RF baseband chip in actual use in the satellite navigation signal receiver.

[0041] In summary, the satellite navigation signal receiver provided in this application embodiment can be configured into an RF channel test circuit based on the receiver signal input port, RF down-conversion module, analog-to-digital conversion module, baseband signal processing module, and receiver signal output port to achieve RF channel performance testing and satellite navigation signal acquisition and tracking. This avoids increasing chip size, chip pin count, and satellite navigation signal receiver output ports, which is beneficial for low-cost and miniaturized design of the chip and the satellite navigation signal receiver as a whole. Furthermore, the test results obtained from the RF channel test can reflect the RF channel performance of the integrated RF baseband chip in actual use in the satellite navigation signal receiver.

[0042] like Figure 2 As shown, in some embodiments of this application, the satellite navigation signal receiver may further include a power divider and multiple filters. The power divider includes an input port and multiple power divider output ports, and the multiple filters are configured one-to-one with the multiple power divider output ports. The connection of the RF down-conversion module to the receiver signal input port includes: the power divider input port is connected to the receiver signal input port, and each power divider output port is connected to the RF down-conversion module through its corresponding filter; wherein, each power divider output port is used to output an RF signal at a single frequency point, and the RF single-carrier signal is selected from multiple preset signals, with the multiple preset signals configured one-to-one with the frequency points of the multiple power divider output ports.

[0043] Understandably, satellite navigation signal receivers receive signals through their signal input ports during RF channel testing or satellite signal tracking and acquisition. The received signals are then distributed to different output ports via power dividers. Filters can filter out signals from frequency bands other than those at the corresponding power divider output ports.

[0044] based on Figure 2 The satellite navigation signal receiver shown can track and acquire satellite signals at multiple frequencies, and perform RF channel performance tests based on test signals at multiple frequencies.

[0045] like Figure 3 As shown, this application embodiment also provides a radio frequency (RF) channel testing method for a satellite navigation signal receiver, applied to the satellite navigation signal receiver provided in this application embodiment. The receiver signal input port is connected to a test signal generation device, and the receiver signal output port is connected to a test equipment. The RF channel testing method includes:

[0046] S302, The test signal generation device generates and sends a test radio frequency single-carrier signal to the receiver signal input port.

[0047] Understandably, a test RF single-carrier signal refers to a single-frequency signal in the RF band used for RF channel performance testing. Specifically, the test signal generation device can be a vector signal generator, which can generate a single-carrier signal for RF channel communication and use this single-carrier signal as the test RF single-carrier signal.

[0048] S304, the RF channel test circuit processes the RF single-carrier signal for testing, obtains the digital intermediate frequency signal for testing, and transmits the digital intermediate frequency signal for testing to the test equipment through the receiver signal output port;

[0049] S306. The test equipment determines the RF channel performance of the receiver based on the digital intermediate frequency signal used for testing.

[0050] Specifically, the testing equipment can be a host computer with processing capabilities.

[0051] Based on the above steps, a method for testing the radio frequency (RF) channel of a satellite navigation signal receiver provided in this application embodiment can be implemented without the need for traditional test boards and spectrum analyzers. The RF channel testing method for a satellite navigation signal receiver provided in this application embodiment can directly evaluate the RF channel performance while achieving miniaturization, low power consumption, and low cost, ensuring the stability and reliability of the satellite navigation signal receiver.

[0052] like Figure 4 As shown, in some embodiments of this application, step S304 may include:

[0053] S402, the RF downconversion module receives the test RF single-carrier signal and processes it at the target local oscillator phase-locked loop output frequency and the target amplifier gain to obtain the test intermediate frequency signal.

[0054] Understandably, the RF downconversion module may include sub-modules such as a local oscillator phase-locked loop (LOPL) and an amplifier. The LOPL and amplifier require configured output frequencies and amplification gains when processing satellite navigation signals. During RF channel performance testing, the target LOPL output frequency and the target amplifier gain can be set according to the output frequency and amplification gain configured by the satellite navigation signal receiver when processing satellite navigation signals.

[0055] S404: The analog-to-digital conversion module acquires and processes the intermediate frequency signal for testing to obtain the digital intermediate frequency signal for testing, and transmits the digital intermediate frequency signal for testing to the baseband signal processing module.

[0056] S406, the baseband signal processing module forwards the test digital intermediate frequency signal to the receiver signal output port, and transmits the test digital intermediate frequency signal to the test equipment through the receiver signal output port;

[0057] Step S306 may include:

[0058] S408. The test equipment determines the RF channel performance of the receiver under the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the test digital intermediate frequency signal.

[0059] In some embodiments of this application, in order to test the performance of the RF channel under different local oscillator phase-locked loop output frequencies and amplifier gains, the RF channel testing method for satellite navigation signal receivers provided in this application may further include: after determining the RF channel performance of the receiver under the target local oscillator phase-locked loop output frequency and target amplifier gain, the test equipment controls the RF down-conversion module to redetermine the target local oscillator phase-locked loop output frequency and target amplifier gain of the RF down-conversion module, until the target local oscillator phase-locked loop output frequency and target amplifier gain of the RF down-conversion module have traversed all combinations of multiple preset frequencies and multiple preset gains; when the target local oscillator phase-locked loop output frequency and target amplifier gain of the RF down-conversion module are redetermined, the test equipment acquires a test digital intermediate frequency signal through the receiver signal output port; the test equipment determines the RF channel performance of the receiver under the redetermined target local oscillator phase-locked loop output frequency and target amplifier gain based on the test digital intermediate frequency signal.

[0060] Based on the above steps, the target local oscillator phase-locked loop output frequency and target amplifier gain can be configured through the test equipment, enabling the test equipment to perform RF channel testing under various combinations of multiple preset frequencies and multiple preset gains. This allows the RF channel performance parameters of the satellite navigation signal receiver to be obtained when the RF downconversion module has different target local oscillator phase-locked loop output frequencies and target amplifier gains.

[0061] like Figure 5 As shown, in some embodiments of this application, the satellite navigation signal receiver further includes a power divider and multiple filters. The power divider includes an input port and multiple power divider output ports, and the multiple filters are configured one-to-one with the multiple power divider output ports. The RF down-conversion module is connected to the receiver signal input port, including: the power divider input port is connected to the receiver signal input port, and each power divider output port is connected to the RF down-conversion module through its corresponding filter; wherein each power divider output port is used to output an RF signal at a single frequency point, and the RF single-carrier signal is selected from multiple preset signals, with each preset signal corresponding one-to-one with the frequency point of the multiple power divider output ports.

[0062] The RF channel testing method also includes: after the test equipment determines the RF channel performance of the receiver based on the test digital intermediate frequency signal, the receiver signal input port re-receives the test RF single carrier signal until the receiver signal input port has traversed and received multiple preset signals; when re-receiving the test RF single carrier signal, the test equipment obtains the test digital intermediate frequency signal through the receiver signal output port; the test equipment determines the RF channel performance of the receiver when the receiver re-receives the test RF single carrier signal based on the test digital intermediate frequency signal.

[0063] Based on the above steps, the RF channel performance of a satellite navigation signal receiver when processing different RF signals can be tested, provided the receiver is capable of receiving multiple different RF signals. Figure 5 For example, the RF signal is divided into three signals at different frequency points: B1, B2, and B3, corresponding to the output ports of three power dividers. These signals arrive at the input ports RX1, RX2, and RX3 of the RF downconverter module, respectively. Based on the above method, the RF channel test can first be performed using the test RF single-carrier signal received at frequency point B1. Then, the signal source generates another RF single-carrier signal at frequency point B2, which is received by the RF downconverter module and used for another RF channel test. The same applies to the test RF single-carrier signal B3.

[0064] In some embodiments of this application, the test equipment in step S408 determines the receiver's RF channel performance under the target local oscillator phase-locked loop output frequency and target amplifier gain based on the test digital intermediate frequency signal. This may include: processing the test digital intermediate frequency signal using Fast Fourier Transform to obtain the frequency domain signal of the test intermediate frequency signal; determining the target power parameter in the frequency domain signal of the intermediate frequency signal; and determining the receiver's performance test indicators under the target local oscillator phase-locked loop output frequency and target amplifier gain based on the target power parameter.

[0065] Understandably, performance metrics for RF channels can include noise figure, spurious equivalent power, and linearity. Therefore, to obtain different performance metrics for RF channels, different target power parameters can be acquired based on the aforementioned frequency domain signals. The following describes the process by which the test equipment determines the receiver's RF channel performance at the target local oscillator PLL output frequency and the target amplifier gain based on the test digital intermediate frequency signal, using spurious equivalent power and noise figure.

[0066] In some embodiments of this application, the target power parameter includes spurious power, and the performance test index includes spurious equivalent power. Determining the target power parameter in the frequency domain signal of the intermediate frequency signal includes: determining the spurious power of spurious signals outside the frequency of the test radio frequency single carrier signal based on the frequency domain signal of the intermediate frequency signal; and determining the spurious equivalent power of the receiver under the conditions of the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the spurious power.

[0067] After the intermediate frequency (IF) signal is processed by the test equipment using a Fast Fourier Transform (FFT), the frequency domain signal of the IF signal can be obtained. The signal power of each frequency band can then be determined within the frequency domain signal. Therefore, the spurious power of other spurious signals besides the IF signal can be directly obtained from the frequency domain signal, and the spurious equivalent power of the satellite navigation signal receiver can be determined based on the spurious power of the spurious signals. The spurious equivalent power can be calculated based on the total power of spurious signals at different frequencies, or based on the ratio or difference between the power of spurious signals at different frequencies and the signal power of the signal band.

[0068] like Figure 6 As shown, in some embodiments of this application, the target power parameter includes the intermediate frequency (IF) single-carrier power, and the performance test index includes the noise figure. Determining the target power parameter in the frequency domain signal of the IF signal may include: determining the IF single-carrier power based on the frequency domain signal.

[0069] Determining the receiver's performance test parameters based on the target power parameters at the target local oscillator PLL output frequency and the target amplifier gain may include:

[0070] S602. Obtain the power of the test RF single-carrier signal, and determine the RF channel gain of the RF channel based on the intermediate frequency single-carrier power and the RF single-carrier signal power.

[0071] Specifically, determining the RF channel gain based on the intermediate frequency single carrier power and the power of the RF single carrier signal may include: determining the RF channel gain based on the difference between the intermediate frequency single carrier power and the power of the RF single carrier signal.

[0072] As an example, the RF channel gain G = P1 - P0; where P1 represents the intermediate frequency single-carrier power and P0 represents the power of the RF single-carrier signal.

[0073] S604. Obtain the noise signal transmitted at the receiver signal output port when there is no signal input at the receiver signal input port;

[0074] S606. Determine the noise power based on the frequency domain signal of the noise signal obtained by fast Fourier processing, and determine the amplified thermal noise power of the RF channel based on the preset thermal noise power and the RF channel gain.

[0075] Specifically, determining the amplified thermal noise power of the RF channel based on the preset thermal noise power and the RF channel gain may include: determining the amplified thermal noise power of the RF channel based on the sum of the preset thermal noise power and the RF channel gain. Understandably, the preset thermal noise power is generally set to -174 dBm / Hz. As an example, the amplified thermal noise power of the RF channel P3 = -174 + G.

[0076] S608. Determine the noise figure of the RF channel based on the noise power and the thermal noise power after amplification of the RF channel.

[0077] In some embodiments of this application, step S608 may include determining the difference between the noise power and the amplified thermal noise power of the RF channel as the noise figure of the RF channel.

[0078] As an example, the noise figure of the radio frequency channel is NF = P2 - P3, where P2 represents the noise power determined from the frequency domain signal of the noise signal.

[0079] Based on the above steps, the RF channel performance of the satellite navigation signal receiver provided in this application embodiment can be tested, obtaining the RF channel performance of the RF baseband integrated chip in the satellite navigation signal receiver. The satellite navigation signal receiver does not require additional wiring at the RF down-conversion module via a digital interface, nor does it require setting up a corresponding interface on the satellite navigation signal receiver. This reduces the design complexity of the RF baseband integrated chip and the satellite navigation signal receiver board, ensuring miniaturization requirements. The test digital intermediate frequency signal received by the test equipment originates from the ADC (analog-to-digital converter) sampling value of the intermediate frequency signal after RF down-conversion, sharing the same link as the positioning calculation of normal satellite signals, thus ensuring the accuracy of the test results. Adding a test equipment to the satellite navigation signal receiver based on the above RF channel test method allows for the evaluation of RF channel performance. The test equipment can be a host computer with computing capabilities, which can be used when the satellite navigation signal receiver performs positioning calculations for normal satellite signals, thus providing a convenient means for problem analysis and positioning of the satellite navigation signal receiver. In the event of a receiver malfunction, the internal radio frequency channel of the satellite navigation signal receiver can be directly analyzed for abnormalities without the need for additional testing instruments.

[0080] This application also provides a test apparatus for a satellite navigation signal receiver, including a processor. The processor is configured to retrieve instructions from memory and, when executing the instructions, to implement the radio frequency channel test method for a satellite navigation signal receiver according to this application.

[0081] This application also provides a machine-readable storage medium storing instructions that cause a machine to perform the above-described radio frequency channel test method for a satellite navigation signal receiver.

[0082] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0083] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0084] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0085] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0086] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0087] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0088] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0089] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0090] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A satellite navigation signal receiver, characterized in that, include: Receiver signal input port; An integrated RF baseband chip includes an RF downconversion module, an analog-to-digital converter module, and a baseband signal processing module. The RF downconversion module is connected to the receiver signal input port, the analog-to-digital converter module is connected to the RF downconversion module, and the baseband signal processing module is connected to the analog-to-digital converter module. The receiver signal output port is connected to the baseband signal processing module; The receiver signal input port, the RF downconversion module, the analog-to-digital conversion module, the baseband signal processing module, and the receiver signal output port are connected to form an RF channel test circuit. The receiver signal output port is used to connect to the test equipment so that the test equipment can determine the RF channel performance of the receiver based on the test signal transmitted by the RF channel test circuit. When the satellite navigation signal receiver is working normally to receive satellite navigation signals, it uses the radio frequency channel test circuit to realize the down-conversion of satellite navigation signals, baseband signal processing, and acquisition and tracking of satellite navigation signals.

2. A method for testing the radio frequency channel of a satellite navigation signal receiver, characterized in that, The satellite navigation signal receiver described in claim 1 is wherein the receiver signal input port is connected to a test signal generation device and the receiver signal output port is connected to a test device. The radio frequency channel testing method includes: The test signal generation device generates and sends a test radio frequency single-carrier signal to the signal input port of the receiver; The RF channel test circuit processes the test RF single-carrier signal to obtain the test digital intermediate frequency signal, and transmits the test digital intermediate frequency signal to the test equipment through the receiver signal output port; The test equipment determines the RF channel performance of the receiver based on the test digital intermediate frequency signal.

3. The RF channel testing method according to claim 2, characterized in that, The radio frequency channel test circuit processes the test radio frequency single-carrier signal to obtain a test digital intermediate frequency signal, and transmits the test digital intermediate frequency signal to the test equipment through the receiver signal output port, including: The RF downconversion module receives the test RF single-carrier signal and processes the test RF single-carrier signal at the target local oscillator phase-locked loop output frequency and the target amplifier gain to obtain the test intermediate frequency signal. The analog-to-digital conversion module acquires and processes the intermediate frequency signal for testing to obtain a digital intermediate frequency signal for testing, and transmits the digital intermediate frequency signal for testing to the baseband signal processing module. The baseband signal processing module forwards the test digital intermediate frequency signal to the receiver signal output port, and transmits the test digital intermediate frequency signal to the test equipment through the receiver signal output port; The test equipment determines the RF channel performance of the receiver based on the test digital intermediate frequency signal, including: The test equipment determines the RF channel performance of the receiver at the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the test digital intermediate frequency signal.

4. The radio frequency channel testing method according to claim 3, characterized in that, The test equipment determines the RF channel performance of the receiver at the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the test digital intermediate frequency signal, including: The test digital intermediate frequency signal is processed by Fast Fourier Transform to obtain the frequency domain signal of the test intermediate frequency signal; Determine the target power parameter in the frequency domain of the intermediate frequency signal; The performance test parameters of the receiver are determined based on the target power parameters, under the conditions of the target local oscillator phase-locked loop output frequency and the target amplifier gain.

5. The RF channel testing method according to claim 4, characterized in that, The target power parameter includes stray power, and the performance test index includes stray equivalent power; Determining the target power parameter in the frequency domain of the intermediate frequency signal includes: The spurious power of the spurious signal outside the frequency range of the test radio frequency single carrier signal is determined based on the frequency domain signal of the intermediate frequency signal. The spurious equivalent power of the receiver is determined based on the spurious power at the target local oscillator phase-locked loop output frequency and the target amplifier gain.

6. The radio frequency channel testing method according to claim 4, characterized in that, The target power parameter includes intermediate frequency single carrier power, and the performance test index includes noise figure; The determination of the target power parameter in the frequency domain signal of the intermediate frequency signal includes: The intermediate frequency single carrier power is determined based on the frequency domain signal; The step of determining the performance test indicators of the receiver at the target local oscillator phase-locked loop output frequency and the target amplifier gain based on the target power parameters includes: Obtain the power of the test radio frequency single-carrier signal; The RF channel gain of the RF channel is determined based on the intermediate frequency single carrier power and the power of the RF single carrier signal; Acquire the noise signal transmitted at the receiver signal output port when there is no signal input at the receiver signal input port; The noise power is determined based on the frequency domain signal of the noise signal obtained by fast Fourier processing, and the amplified thermal noise power of the radio frequency channel is determined based on the preset thermal noise power and the radio frequency channel gain. The noise figure of the radio frequency channel is determined based on the noise power and the thermal noise power after amplification of the radio frequency channel.

7. The RF channel testing method according to claim 6, characterized in that, The noise figure of the radio frequency channel is determined based on the noise power and the amplified thermal noise power of the radio frequency channel, including: The difference between the noise power and the amplified thermal noise power of the radio frequency channel is determined as the noise figure of the radio frequency channel.

8. The RF channel testing method according to claim 3, characterized in that, The target local oscillator phase-locked loop output frequency and the target amplifier gain are determined by the test equipment controlling the RF downconversion module. The target local oscillator phase-locked loop output frequency and the target amplifier gain are selected from multiple preset frequencies and multiple preset gains. The radio frequency channel testing method also includes: After determining the RF channel performance of the receiver under the target local oscillator phase-locked loop output frequency and the target amplifier gain, the test equipment controls the RF downconversion module to re-determine the target local oscillator phase-locked loop output frequency and the target amplifier gain of the RF downconversion module until the target local oscillator phase-locked loop output frequency and the target amplifier gain of the RF downconversion module have traversed all combinations of the plurality of preset frequencies and the plurality of preset gains. With the target local oscillator phase-locked loop output frequency and target amplifier gain of the RF downconversion module redefined, the test equipment acquires the test digital intermediate frequency signal through the receiver signal output port; The test equipment determines the RF channel performance of the receiver at the redefined target local oscillator phase-locked loop output frequency and the target amplifier gain based on the test digital intermediate frequency signal.

9. The radio frequency channel testing method according to claim 2, characterized in that, The satellite navigation signal receiver also includes a power divider and multiple filters. The power divider includes an input port and multiple power divider output ports, and the multiple filters are configured one-to-one with the multiple power divider output ports. The RF downconversion module is connected to the receiver signal input port, including: the power divider input port is connected to the receiver signal input port, and each of the power divider output ports is connected to the RF downconversion module through its corresponding filter. Each of the power divider output ports is used to output a radio frequency signal at a specific frequency. The radio frequency single carrier signal is selected from multiple preset signals, and the multiple preset signals are set to correspond one-to-one with the frequency points of the multiple power divider output ports. The radio frequency channel testing method also includes: After the test equipment determines the RF channel performance of the receiver based on the test digital intermediate frequency signal, the receiver signal input port re-receives the test RF single carrier signal until the receiver signal input port has traversed and received the plurality of preset signals; When the test radio frequency single carrier signal is received again, the test equipment obtains the test digital intermediate frequency signal through the receiver signal output port; The test equipment determines the RF channel performance of the receiver when the receiver re-receives the test RF single-carrier signal based on the test digital intermediate frequency signal.

10. A testing device for a satellite navigation signal receiver, characterized in that, The device includes a processor configured to retrieve instructions from memory and, when executing the instructions, to implement the radio frequency channel testing method for a satellite navigation signal receiver according to any one of claims 2 to 9.

11. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform the radio frequency channel test method for a satellite navigation signal receiver according to any one of claims 2 to 9.

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