CN115685262A - Consistency Measurement Method Between Channels of Navigation Simulator Based on Signal Amplitude and Phase Characteristics - Google Patents
Consistency Measurement Method Between Channels of Navigation Simulator Based on Signal Amplitude and Phase Characteristics Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及卫星导航领域,尤其涉及一种基于信号幅相特性的导航模拟器通道间一致性测量方法。The invention relates to the field of satellite navigation, in particular to a method for measuring consistency between channels of a navigation simulator based on signal amplitude and phase characteristics.
背景技术Background technique
在和卫星导航相关的科研、应用过程中,仅依靠全球卫星系统(GNSS)接收机(以下简称“接收机”)来接收导航卫星信号的方式,会受如可视卫星数量、天气、电磁环境等诸多不可控因素影响,导致科研、验证工作的进度和效率降低,并且受条件限制,无法得到多样化的导航卫星状态场景来满足需求。因此,利用GNSS信号模拟器来模拟各种导航卫星信号就成为首选。GNSS信号模拟器(以下简称“模拟器”)是GNSS系统信号发生器,能够根据运动载体的状况,提供全球导航卫星系统信号仿真,精确模拟产生载体能够收到的GNSS卫星信号。卫星星座包括GPS、GLONASS、GALILEO、BDS等,可用在GNSS接收机的研发、生产和计量过程的各个环节,可对接收机的捕获、跟踪和测量准确度进行测量鉴定,是GNSS接收机校准过程中的关键计量器具。In the process of scientific research and application related to satellite navigation, the way of receiving navigation satellite signals only by relying on the Global Satellite System (GNSS) receiver (hereinafter referred to as "receiver") will be affected by factors such as the number of visible satellites, weather, and electromagnetic environment. Affected by many uncontrollable factors, such as scientific research and verification, the progress and efficiency of scientific research and verification work are reduced, and limited by conditions, it is impossible to obtain a variety of navigation satellite status scenarios to meet the needs. Therefore, the use of GNSS signal simulators to simulate various navigation satellite signals has become the first choice. GNSS signal simulator (hereinafter referred to as "simulator") is a GNSS system signal generator, which can provide GNSS signal simulation according to the condition of the moving carrier, and accurately simulate and generate GNSS satellite signals that the carrier can receive. Satellite constellations include GPS, GLONASS, GALILEO, BDS, etc., which can be used in all aspects of the R&D, production and measurement process of GNSS receivers. It can measure and identify the acquisition, tracking and measurement accuracy of receivers. key measuring instruments.
目前,市场上的模拟器主要应用于进行接收机校准及其方法研究,并应用于日后各种接收机(包括高动态、高灵敏度接收机)的校准工作,在开发、资质审查、认证中对接收设备进行精确的测量和评估,减少或完全消失现场测量的高额费用,摆脱在实际环境中应用的限制。同时兼顾应用于接收机内部延时的测量及其研究,此项指标的测量是精密时间传递及其研究的基础。大部分模拟器产品为国外厂商生产(如Spirent等品牌),其产品的各项指标较高、性能较先进。很多国内厂商已具备自主研发生产模拟器的能力,并且自主研发生产规模不断扩大,技术水平不断提高。At present, the simulators on the market are mainly used for receiver calibration and method research, and will be applied to the calibration of various receivers (including high dynamic and high sensitivity receivers) in the future. The receiving equipment performs accurate measurement and evaluation, reducing or completely eliminating the high cost of on-site measurement, and getting rid of the limitation of application in the actual environment. At the same time, taking into account the measurement and research of the internal delay of the receiver, the measurement of this index is the basis of precision time transfer and its research. Most of the simulator products are produced by foreign manufacturers (such as Spirent and other brands), and their products have high indicators and advanced performance. Many domestic manufacturers already have the ability to independently develop and produce simulators, and the scale of independent research and development and production continues to expand, and the technical level continues to improve.
针对卫星导航系统发展的现状,要求导航模拟器可以产生多个频点、多个系统和多种制式的导航信号。这就需要在模拟器的内部,采用多个模块产生各种信号,再统一叠加。由于电路参数、时钟传输延迟、相位上的差异,以及射频单元的相位非线性效应和群时延虽频率和环境变化,信号模拟的通道一致性成为影响信号模拟精度的重要问题。即使各个模块采用统一时钟,采用相同的结构和器件,然而由于器件之间的差异性以及器件在使用一段时间后产生后期特性漂移问题都会使得器件之间信号模拟的通道一致性问题难以完全解决。In view of the status quo of satellite navigation system development, it is required that the navigation simulator can generate navigation signals of multiple frequency points, multiple systems and multiple formats. This requires multiple modules to generate various signals inside the simulator, and then superimpose them uniformly. Due to differences in circuit parameters, clock transmission delay, and phase, as well as phase nonlinear effects and group delays of radio frequency units, although frequency and environment changes, the channel consistency of signal simulation has become an important issue that affects the accuracy of signal simulation. Even if each module adopts a unified clock and uses the same structure and devices, due to the differences between devices and the later characteristic drift of devices after a period of use, it is difficult to completely solve the channel consistency problem of signal simulation between devices.
模拟器一个通道仿真一颗卫星,内部通道间一致性是其一项重要技术指标,通道一致性要求同一频点多个通道在相同条件下初始状态是一致的,从信号层面上表现在延迟为0,如果各通道初始状态下有延迟,其作为系统误差会影响整个仿真场景,从而影响接收机定位。One channel of the simulator simulates a satellite, and the consistency between internal channels is an important technical indicator. Channel consistency requires multiple channels at the same frequency to be consistent in the initial state under the same conditions. From the signal level, the delay is expressed as 0, if there is a delay in the initial state of each channel, it will affect the entire simulation scene as a system error, thereby affecting the receiver positioning.
传统的通道间一致性的测量方法是将模拟器输出的1PPS信号输入到示波器作为触发信号,同时用示波器另一通道测量模拟器输出的不同通道BPSK信号,用示波器测量BPSK信号翻转点到1pps的时延,比较不同通道(卫星)和1pps上升沿的时间差,计算通道一致性误差。这种方法的局限性是实际调制信号的“翻转点”并不是一个过零点,而是一段曲线,且上下起伏,无法找到统一的时延点,不确定度大,只能在ns量级上验证。此外该方法只能测量导航频点为BPSK调制的信号,无法测量采用其它调制方式的信号,体现了现有测量方式局限性大的问题。The traditional method of measuring consistency between channels is to input the 1PPS signal output by the simulator to the oscilloscope as a trigger signal, and at the same time use another channel of the oscilloscope to measure the BPSK signals of different channels output by the simulator, and use the oscilloscope to measure the BPSK signal flip point to 1pps. Delay, compare the time difference between different channels (satellites) and the rising edge of 1pps, and calculate the channel consistency error. The limitation of this method is that the "turnover point" of the actual modulated signal is not a zero-crossing point, but a curve, and it fluctuates up and down. It is impossible to find a unified delay point. The uncertainty is large and can only be on the order of ns verify. In addition, this method can only measure signals modulated by BPSK at the navigation frequency point, and cannot measure signals using other modulation methods, which reflects the problem of large limitations of existing measurement methods.
为适应不同行业不同应用领域,模拟器需具备多系统多频点导航信号输出功能,根据各系统ICD的定义,不同系统不同频点的导航信号调制方式并不一样,有BPSK、QPSK、BOC调制等多种调制方式,尤其是随着新体制模拟器的面世与应用,信号调制方法与旧体制有所不同,新体制的导航信号更多的采用QPSK和BOC调制。然而,现有的模拟器通道间一致性校准方法只适应BPSK调制的信号。In order to adapt to different application fields in different industries, the simulator needs to have multi-system multi-frequency point navigation signal output function. According to the definition of ICD of each system, the navigation signal modulation methods of different systems and different frequency points are not the same, such as BPSK, QPSK, BOC modulation And many other modulation methods, especially with the advent and application of the new system simulator, the signal modulation method is different from the old system, and the navigation signals of the new system mostly use QPSK and BOC modulation. However, existing simulator channel-to-channel coherence calibration methods are only suitable for BPSK-modulated signals.
图1为现有方法校准模拟器通道间一致性的测量结果截图,图片显示未模拟器四个通道分别单独输出BPSK信号翻转点与模拟器1PPS信号上升沿的位置关系,此时数字示波器的水平尺度较大。图2为图1中四个通道信号翻转点放大图,此时水平尺度为10ns/div。图2中可以看出,信号翻转点并不是一个过零点,而是一段幅度较小的信号,难以找到真正的过零点,因此导致测量结果的不确定较大。Figure 1 is a screenshot of the measurement results of the existing method to calibrate the consistency between the channels of the simulator. The picture shows the positional relationship between the flip point of the BPSK signal output separately from the four channels of the simulator and the rising edge of the simulator 1PPS signal. At this time, the level of the digital oscilloscope Larger scale. Figure 2 is an enlarged view of the signal inversion points of the four channels in Figure 1, and the horizontal scale is 10 ns/div at this time. It can be seen from Figure 2 that the signal inversion point is not a zero-crossing point, but a signal with a small amplitude. It is difficult to find the real zero-crossing point, which leads to greater uncertainty in the measurement results.
从而体现现有技术的问题是:Thereby embodying the problem of prior art is:
(1)只能对BPSK调制的导航信号进行测量,无法测量其他调制方式导航信号的通道间一致性,限制性大。(1) Only BPSK-modulated navigation signals can be measured, and the inter-channel consistency of navigation signals of other modulation methods cannot be measured, which is very restrictive.
(2)从实际测量结果来看,现有技术采用用来测量BPSK调制信号的翻转点并非为一个信号点,而是一段波动的过零信号,测量翻转点存在较大不确定性,导致校准结果不准确,其不确定度为ns量级。(2) Judging from the actual measurement results, the inversion point used to measure the BPSK modulation signal in the prior art is not a signal point, but a fluctuating zero-crossing signal. There is a large uncertainty in the measurement of the inversion point, which leads to calibration The result is not accurate, and its uncertainty is on the order of ns.
通过以上两点问题可以明确,现有的模拟器通道间一致性校准方法测量准确度不高,难以真实反映高精度模拟器通道间一致性情况。Through the above two points, it can be clarified that the measurement accuracy of the existing consistency calibration method between simulator channels is not high, and it is difficult to truly reflect the consistency between channels of high-precision simulators.
所以如何提供一种能够适用于多种调制方式的卫星导航模拟器通道间一致性测量方法成为亟待解决的问题。So how to provide a consistency measurement method between satellite navigation simulator channels that can be applied to multiple modulation modes has become an urgent problem to be solved.
发明内容Contents of the invention
针对目前模拟器通道间一致性校准方法的局限性,本发明提供一种基于信号幅相特性的导航模拟器通道间一致性测量方法,解决BPSK调制信号限制及测量准确度不高的问题。Aiming at the limitations of current simulator channel consistency calibration methods, the present invention provides a navigation simulator channel consistency measurement method based on signal amplitude and phase characteristics, which solves the problems of BPSK modulation signal limitation and low measurement accuracy.
为了实现上述目的,本发明技术方案提供了一种基于信号幅相特性的导航模拟器通道间一致性测量方法,包括:选取模拟器导航系统任一频点的单载波信号,单独测量任意两通道峰值电平,这两个通道的峰值电平要求一致。同时输出两通道信号,测量合成信号峰值电平;将所述合成峰值电平与所述单一峰值电平比较,判断合成信号幅度增加值是否为6.02dB,若否,则根据电平差值获取延迟的相位差,根据所述相位差获取两通道间的延迟时间。In order to achieve the above object, the technical solution of the present invention provides a method for measuring the consistency between channels of a navigation simulator based on signal amplitude and phase characteristics, including: selecting a single carrier signal at any frequency point of the simulator navigation system, and measuring any two channels separately Peak level, the peak level requirements of the two channels are consistent. Simultaneously output two-channel signals, measure the peak level of the composite signal; compare the composite peak level with the single peak level, and judge whether the amplitude increase of the composite signal is 6.02dB, if not, obtain it according to the level difference Delayed phase difference, the delay time between the two channels is obtained according to the phase difference.
作为上述技术方案的优选,较佳的,当所述差值不为6.02dB时,根据合成信号幅度增加值Δ'进行反算得到相位差θ:As an optimization of the above technical solution, preferably, when the difference is not 6.02dB, the phase difference θ is obtained by inverse calculation according to the amplitude increase value Δ' of the composite signal:
其中,θ的单位为弧度。 Among them, the unit of θ is radian.
作为上述技术方案的优选,较佳的,根据相位差θ计算得到通道间延迟时间Δt;As an optimization of the above technical solution, preferably, the inter-channel delay time Δt is calculated according to the phase difference θ;
作为上述技术方案的优选,较佳的,若所述合成信号幅度增加值为6.02dB,则两通道间延迟为0ns。As a preference of the above technical solution, preferably, if the composite signal amplitude increase value is 6.02dB, the delay between the two channels is 0 ns.
发明的优点是:只要可以选择输出单载波信号即可进行测量,不受导航信号所采用的调制方式的限制;利用单载波信号相幅特性的特点,无需找调制信号的翻转点,通过读取频谱仪显示单载波信号的峰值电平,并根据本发明的计算方法,即可计算得到通道间的延迟,不确定度优于10ps。由于采用峰值电平计算延迟,降低模拟器通道间一致性测量的不确定度,准确度高,参考价值大,为调试提供更加可靠的依据。The advantage of the invention is: as long as the single-carrier signal can be selected to be output, the measurement can be carried out without being restricted by the modulation method adopted by the navigation signal; by using the characteristics of the phase-amplitude characteristics of the single-carrier signal, there is no need to find the flip point of the modulation signal, and by reading The spectrum analyzer displays the peak level of the single carrier signal, and according to the calculation method of the present invention, the delay between channels can be calculated, and the uncertainty is better than 10 ps. Since the peak level is used to calculate the delay, the uncertainty of the consistency measurement between the simulator channels is reduced, the accuracy is high, and the reference value is large, which provides a more reliable basis for debugging.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图简单介绍,显而易见地,下面描述中的附图是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are the For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without any creative effort.
图1为本发明涉及的原有技术中校准模拟器通道间一致性的测量结果截图。FIG. 1 is a screenshot of the measurement results of the consistency between calibration simulator channels in the prior art related to the present invention.
图2为图1中通道信号翻转点放大图。FIG. 2 is an enlarged view of the channel signal inversion point in FIG. 1 .
图3为本发明技术方案提供的测量过程流程图。Fig. 3 is a flow chart of the measurement process provided by the technical solution of the present invention.
图4为本发明实施例中基于单载波信号的模拟器通道间一致性测量仪器连接框图。Fig. 4 is a connection block diagram of the consistency measuring instrument between simulator channels based on the single carrier signal in the embodiment of the present invention.
图5为应用本发明的方法测量同一频点导航信号单个通道输出单载波信号时用频谱仪测量的情况。Fig. 5 is the situation of measuring with a spectrum analyzer when the method of the present invention is used to measure the single channel output single carrier signal of the navigation signal at the same frequency point.
图6为应用本发明的方法测量同一频点导航信号两个通道同时输出单载波信号时用频谱仪测量的情况。Fig. 6 is the situation of measuring with a spectrum analyzer when the method of the present invention is used to measure the same frequency point navigation signal and two channels simultaneously output a single carrier signal.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整的描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例,都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
现结合实施例对本发明技术方案进行说明,图3为本发明实施例提供的流程示意图,如图3所示:The technical solution of the present invention is now described in conjunction with the embodiments. Fig. 3 is a schematic flow diagram provided by the embodiment of the present invention, as shown in Fig. 3:
步骤101、设置卫星导航模拟器的初始状态。Step 101, setting the initial state of the satellite navigation simulator.
包括,设置模拟器为静态场景,卫星与载体伪距固定,选取导航系统任一频点单载波信号。Including, setting the simulator as a static scene, the pseudo-range between the satellite and the carrier is fixed, and selecting a single-carrier signal at any frequency point of the navigation system.
步骤102、分别测量通道1和通道2的峰值电平。Step 102, measure the peak levels of
模拟器输出任一频点卫星通道信号,利用频谱分析仪测量通道1的信号峰值电平P0。保持模拟器仿真设置不变,切换另一通道2,利用频谱分析仪测量通道2的峰值电平P0′。判断两个通道信号峰值电平是否相等,即P0=P0′。若两个通道峰值电平不同则对两峰值电平中任一电平进行调整,使得两通道峰值电平相等。The simulator outputs satellite channel signals at any frequency point, and uses a spectrum analyzer to measure the signal peak level P 0 of
步骤103、测量两个信号合成后的合成信号的合成峰值电平P1。Step 103. Measure the composite peak level P 1 of the composite signal after the two signals are composited.
具体的,模拟器同时输出步骤102中两通道信号,用频谱分析仪测量合成信号峰值电平。Specifically, the simulator simultaneously outputs the signals of the two channels in step 102, and uses a spectrum analyzer to measure the peak level of the synthesized signal.
步骤104、计算峰值电平差Δ′。
具体的,峰值电平差为:合成信号峰值电平与单通道信号峰值电平的差。Specifically, the peak level difference is: the difference between the peak level of the composite signal and the peak level of the single-channel signal.
步骤105、判断峰值电平差是否为6.02dB,若是则证明这两个通道间的延迟为0ns,否则执行步骤106。
详细的,将通道1、2两信号叠加,获取理论叠加值。由于两路合成信号的两路同幅度同频率的正弦波信号,相位差为θ,信号合成后中心频率不会变,变化的只是信号电平和相位,如下式所示:In detail, the two signals of
在实际情况中,合成后的信号频率没有改变,幅度随相位差变化而变化。对于导航模拟器,同一频点相同状态卫星理想条件下通道间一致性延迟为0ns,即相位差θ为为0。In actual situations, the frequency of the synthesized signal does not change, and the amplitude changes with the change of the phase difference. For the navigation simulator, under the ideal condition of satellites at the same frequency point and the same state, the consistency delay between channels is 0 ns, that is, the phase difference θ is 0.
两通道单载波信号峰值电平相等,即P0=P0′,若通道间延迟为0ns,根据上式所示两路合成信号幅值是一路信号的2倍,幅度转换成对数(dB)表示,两路合成信号比单路信号幅度增加值ΔP为:ΔP=20log 2=6.02dB。The peak levels of the two-channel single-carrier signals are equal, that is, P 0 =P 0 ′, if the delay between channels is 0ns, according to the above formula, the amplitude of the two-channel composite signal is twice that of the one-channel signal, and the amplitude is converted into logarithm (dB ) indicates that the amplitude increase value ΔP of the two-way composite signal compared with the single-way signal is: ΔP=
反之,在步骤105中,若用频谱分析仪测量测量两路合成信号峰值电平比单路信号峰值电平大6.02dB,证明模拟器该频点同时输出单载波信号的两个通道之间延迟为0ns,测量结束。Conversely, in
步骤106、根据峰值电平差Δ′计算相位差θ。
具体的, specific,
其中,θ的单位为弧度。 Among them, the unit of θ is radian.
步骤107、根据相位差θ反算延迟时间Δt。Step 107, inversely calculating the delay time Δt according to the phase difference θ.
f为模拟器输出单载波信号的中心频率标称值。 f is the nominal value of the center frequency of the single carrier signal output by the simulator.
图4为本发明提出的模拟器通道间一致性测量方法仪器连接框图,测量前需将模拟器和频谱分析仪开机预热半小时,模拟器的射频信号输出端与频谱分析仪信号输入端相接。Fig. 4 is the instrument connection block diagram of the method for measuring the consistency between simulator channels proposed by the present invention. Before the measurement, the simulator and the spectrum analyzer need to be turned on for half an hour to warm up, and the radio frequency signal output of the simulator is connected to the spectrum analyzer signal input. catch.
在基于本发明技术方案提供的通道一致性测量方法中,卫星导航模拟器仿真静态场景,卫星和载体伪距固定,关闭调制信号使信号输出单载波,先仿真1颗卫星,测量峰值电平,再增加1颗卫星,测量叠加后信号峰值改变值,计算相位差和延迟。切换叠加的不同通道卫星可以验证其它通道卫星延迟,从而得到频点内所有通道卫星之间的延迟。In the channel consistency measurement method provided based on the technical solution of the present invention, the satellite navigation simulator simulates a static scene, the pseudo-range of the satellite and the carrier is fixed, the modulation signal is turned off so that the signal outputs a single carrier, and one satellite is first simulated to measure the peak level. Add another satellite, measure the signal peak change value after superimposition, and calculate the phase difference and delay. Switching the superimposed different channel satellites can verify the delay of other channel satellites, so as to obtain the delay between all channel satellites in the frequency point.
现用一具体实施例对本发明方法进行说明,本实施例对国外进口的Spirent公司的GSS9000模拟器进行试验验证,测量设备选用的是德国R&S公司的频谱分析仪。Now use a specific embodiment to illustrate the inventive method, and the present embodiment carries out experimental verification to the GSS9000 simulator of Spirent Company imported abroad, and what measuring equipment selects is the spectrum analyzer of German R&S Company.
选择GPSL1频点作为测量信号,频率为1.57542GHz,周期约为0.63475ns,关闭所有误差模型,设置卫星与载体伪距固定的静态场景,模拟器输出单星单通道单载波信号,用频谱仪测量信号峰值电平P0为-58.10dBm,如附图5所示。切换为另一通道卫星信号,峰值电平P′0也为-58.10dBm,两通道信号幅度一致。Select the GPSL1 frequency point as the measurement signal, the frequency is 1.57542GHz, and the period is about 0.63475ns. Close all error models, set a static scene with a fixed pseudo-range between the satellite and the carrier, and the simulator outputs a single-satellite, single-channel, and single-carrier signal, and measure it with a spectrum analyzer The signal peak level P 0 is -58.10dBm, as shown in Fig. 5 . Switching to another channel satellite signal, the peak level P′ 0 is also -58.10dBm, and the signal amplitudes of the two channels are consistent.
改变模拟器输出为双通道卫星单载波,其它不变,实际测量合成信号峰值电平P1为-52.08dBm,如附图6所示。Change the output of the simulator to dual-channel satellite single-carrier, and keep the others unchanged. The actual measured peak level P 1 of the synthesized signal is -52.08dBm, as shown in Figure 6.
峰值电平改变值:ΔP=P1-P0=-52.08dBm-(-58.10dBm)=6.02dB。Peak level change value: ΔP=P 1 -P 0 =-52.08dBm-(-58.10dBm)=6.02dB.
测量结果与延迟为0ns时理论数据一致,证明两个通道的输出信号无延迟。依据此方法,保持一个通道不变,将其作为参考通道,更换其他通道输出信号,可以逐个测量其它通道与参考通道间的时延,从而得到整个频点所有通道的一致性。The measurement results are consistent with the theoretical data when the delay is 0ns, which proves that the output signals of the two channels have no delay. According to this method, keeping one channel unchanged, using it as a reference channel, and replacing the output signals of other channels, the time delay between other channels and the reference channel can be measured one by one, so as to obtain the consistency of all channels at the entire frequency point.
模拟器的通道间延迟很难做到绝对0ns,测量结果会受所用频谱仪功率分辨力和模拟器输出射频信号稳定性等因素影响。对于功率测量分辨力为0.01dB的频谱仪,结合不同频点频率,通道间延迟测量精度能近似为0.01ns。It is difficult for the inter-channel delay of the simulator to be absolutely 0 ns, and the measurement results will be affected by factors such as the power resolution of the spectrum analyzer used and the stability of the RF signal output by the simulator. For a spectrum analyzer with a power measurement resolution of 0.01dB, combined with different frequency points, the measurement accuracy of the inter-channel delay can be approximately 0.01ns.
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.
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