阅读说明：本技术 一种天线时延标定方法 (Antenna time delay calibration method ) 是由 海波 王玉荣 林玉琼 杨大峰 郑宫明 于 2021-08-17 设计创作，主要内容包括：本发明公开的属于罗兰C技术领域,具体为一种天线时延标定方法,包括具体步骤如下：S1,将罗兰C模拟源、罗兰C接收机、时间间隔计数器、天线辐射筒和接收天线进行连接；S2,将天线放入天线辐射筒内,且天线辐射筒可平放,并对罗兰C模拟源、罗兰C接收机、时间间隔计数器进行通电,设置罗兰C模拟源信号电平输出,设置组重复周期,其中罗兰C接收机的时延已标定；S3,将时间间隔计数器的通道A和通道B的触发电平设置为1V、上升沿触发,且一般为默认,本发明通过采用对比GTP/GRI时差和通过天线辐射筒耦合罗兰C信号的方式解决了罗兰C接收天线时延的标定的问题,从而在实际应用中提高了罗兰C授时的准确度。(The invention discloses an antenna time delay calibration method, belonging to the technical field of Rowland C, comprising the following steps: s1, connecting the Rowland C analog source, the Rowland C receiver, the time interval counter, the antenna radiation cylinder and the receiving antenna; s2, placing the antenna into an antenna radiation cylinder, enabling the antenna radiation cylinder to be horizontally placed, electrifying a Rowland C analog source, a Rowland C receiver and a time interval counter, setting signal level output of the Rowland C analog source, and setting a group repetition period, wherein the time delay of the Rowland C receiver is calibrated; s3, setting the trigger level of the channel A and the channel B of the time interval counter to be 1V, triggering the rising edge, and generally being default, the invention solves the problem of calibrating the time delay of the receiving antenna of the Rowland C by comparing the GTP/GRI time difference and coupling the Rowland C signal through the antenna radiation tube, thereby improving the time service accuracy of the Rowland C in practical application.)

1. An antenna time delay calibration method is characterized in that: the method comprises the following specific steps:

s1, connecting the Rowland C analog source, the Rowland C receiver, the time interval counter, the antenna radiation cylinder and the receiving antenna;

s2, placing the antenna into an antenna radiation cylinder, enabling the antenna radiation cylinder to be horizontally placed, electrifying a Rowland C analog source, a Rowland C receiver and a time interval counter, setting signal level output of the Rowland C analog source, and setting a group repetition period, wherein the time delay of the Rowland C receiver is calibrated;

s3, setting the trigger level of the channel A and the channel B of the time interval counter as 1V, triggering by a rising edge, generally setting the trigger level as default, and setting the time interval counter as time measurement;

s4, when the Rowland C receiver is normally locked, recording the reading on a time interval counter after waiting for 5 minutes, namely the reading is an antenna time delay value, wherein whether 30 mus needs to be subtracted according to GTP/GRI output conditions of different Rowland C analog sources;

s5, the process of antenna delay calibration is as follows:

generating a Rowland C signal through a Rowland C analog source, wherein the Rowland C signal is coupled into an antenna placed in an antenna radiation cylinder through the antenna radiation cylinder;

and step two, the Roland C receiver receives the signals through the receiving antenna, generates corresponding GTP/GRI signals, and calibrates the time delay of the antenna by comparing the difference value of the GTP/GRI signals of the Roland C analog source and the GTP/GRI signals of the Roland C receiver in time.

2. The method for calibrating the antenna delay according to claim 1, further comprising a loran C analog source, a loran C receiver, a time interval counter, an antenna radiation cylinder and a receiving antenna, wherein the loran C analog source is connected to the antenna in the antenna radiation cylinder through a loran C signal, the antenna radiation cylinder is used for reducing external electromagnetic interference, and the loran C analog source is connected to a channel a of the time interval counter through a GTP/GRI signal.

3. The method for calibrating antenna delay according to claim 2, wherein one end of the Rowland C receiver is connected to a receiving antenna, and the receiving antenna is connected to an antenna in an antenna radiation cylinder through a signal.

4. The method of claim 2, wherein the loran C receiver is connected to channel B of the time interval counter via a GTP/GRI signal.

Technical Field

The invention relates to the technical field of Rowland C, in particular to an antenna time delay calibration method.

Background

The current GNSS satellite timing system is mainly based on satellite-based timing, the timing system signal is weak and easy to interfere, the propagation form of the Rowland C timing signal is mainly propagated through ground waves, the transmission process is not easy to change, and has the capability of resisting the influence of electronic interference and natural interference factors, therefore, the advantages of the Rowland C signal can be mutually complemented with the GNSS satellite time service, the Rowland C signal has low frequency and long wavelength, in order to obtain higher time service precision, an antenna time delay correction method is provided, a Rowland C receiver is basic user equipment for realizing a positioning time service function by a user by utilizing a Rowland C system, and relates to a plurality of technical research fields of received signal processing, protection, weak signal detection, signal filtering frequency selection, signal multi-stage amplification, differential signal conversion and the like for an antenna, a mature calibration method does not exist at present, and the antenna time delay is mostly reversely deduced through near-field induction and comparison of a measured value and a theoretical value;

according to the existing calibration mode of the Roland C receiving antenna, the time delay of the antenna is calibrated mainly by comparing 1PPS through near field induction and measuring a TOA comparison theoretical value, and the defects of the existing measurement method can be summarized as follows:

1. the electromagnetic environment of a measurement site is not ideal, so that the measurement error is large;

2. the actual propagation path and the theoretical propagation path have difference and atmospheric conductivity, so that the calibration result is inaccurate;

therefore, an antenna time delay calibration method is provided.

Disclosure of Invention

The present invention is proposed in view of the above and/or the problems existing in the existing antenna delay calibration method.

Therefore, an object of the present invention is to provide an antenna delay calibration method, which solves the problem of calibrating the delay of a loran C receiving antenna by comparing the GTP/GRI time difference and coupling the loran C signal through an antenna radiation cylinder, effectively avoids the influence of the surrounding electromagnetic environment on the calibration by using the antenna radiation cylinder, effectively solves the error caused by position measurement by using the GTP/GRI calibration delay, and can solve the above-mentioned problems of large measurement error, difference between the actual propagation path and the theoretical propagation path, and inaccuracy of the calibration result due to the difference between the actual propagation path and the theoretical propagation path due to the unsatisfactory electromagnetic environment of the measurement site.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:

an antenna time delay calibration method comprises the following specific steps:

s1, connecting the Rowland C analog source, the Rowland C receiver, the time interval counter, the antenna radiation cylinder and the receiving antenna;

s2, placing the antenna into an antenna radiation cylinder, enabling the antenna radiation cylinder to be horizontally placed, electrifying a Rowland C analog source, a Rowland C receiver and a time interval counter, setting signal level output of the Rowland C analog source, and setting a group repetition period, wherein the time delay of the Rowland C receiver is calibrated;

s3, setting the trigger level of the channel A and the channel B of the time interval counter as 1V, triggering by a rising edge, generally setting the trigger level as default, and setting the time interval counter as time measurement;

s4, when the Rowland C receiver is normally locked, recording the reading on a time interval counter after waiting for 5 minutes, namely the reading is an antenna time delay value, wherein whether 30 mus needs to be subtracted according to GTP/GRI output conditions of different Rowland C analog sources;

s5, the process of antenna delay calibration is as follows:

generating a Rowland C signal through a Rowland C analog source, wherein the Rowland C signal is coupled into an antenna placed in an antenna radiation cylinder through the antenna radiation cylinder;

and step two, the Roland C receiver receives the signals through the receiving antenna, generates corresponding GTP/GRI signals, and calibrates the time delay of the antenna by comparing the difference value of the GTP/GRI signals of the Roland C analog source and the GTP/GRI signals of the Roland C receiver in time.

As a preferred scheme of the antenna delay calibration method of the present invention, wherein: the Roland C analog source is connected with an antenna in the antenna radiation cylinder through a Roland C signal, the antenna radiation cylinder is used for reducing external electromagnetic interference, and the Roland C analog source is connected to a channel A of the time interval counter through a GTP/GRI signal.

As a preferred scheme of the antenna delay calibration method of the present invention, wherein: one end of the Rowland C receiver is connected with a receiving antenna, and the receiving antenna is connected with an antenna in the antenna radiation cylinder through signals.

As a preferred scheme of the antenna delay calibration method of the present invention, wherein: the Rowland C receiver is connected to channel B of the time interval counter via a GTP/GRI signal.

Compared with the prior art:

1. the calibration problem of the time delay of the Rowland C receiving antenna is solved by adopting a mode of comparing GTP/GRI time difference and coupling a Rowland C signal through an antenna radiation cylinder, so that the time service accuracy of the Rowland C is improved in practical application;

2. the influence of the surrounding electromagnetic environment on calibration is effectively avoided by using the antenna radiation cylinder, and meanwhile, the error caused by position measurement is effectively solved by using GTP/GRI to calibrate the time delay;

3. the problem that the Rowland time service product needs to be calibrated on site after being installed is solved, and the product does not need to be calibrated again after leaving a factory.

Drawings

Fig. 1 is a schematic diagram of an antenna calibration connection according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The invention provides an antenna time delay calibration method, which has the advantages of improving the accuracy of Rowland C time service and solving the error caused by position measurement, and referring to a figure 1, the method comprises the following specific steps:

s1, connecting the Rowland C analog source, the Rowland C receiver, a time interval counter, an antenna radiation cylinder and a receiving antenna, wherein the time interval counter is an instrument for measuring the time interval of the electric signal, and the time base selected in the measurement is generated by the crystal oscillator signal in the counter through the period after frequency multiplication and frequency division;

s2, placing an antenna into an antenna radiation cylinder, enabling the antenna radiation cylinder to be horizontally placed, electrifying a Rowland C analog source, a Rowland C receiver and a time interval counter, setting the Rowland C analog source signal level output, and setting a group repetition period, wherein the time delay of the Rowland C receiver is calibrated, the Rowland C analog source signal level output can be set to be 60dB mu v, and the group repetition period can be set to be 60000;

s3, setting the trigger level of the channel A and the channel B of the time interval counter as 1V, triggering by a rising edge, generally setting the trigger level as default, and setting the time interval counter as time measurement;

s4, when the Rowland C receiver is normally locked, recording the reading on a time interval counter after waiting for 5 minutes, namely the reading is an antenna time delay value, wherein whether 30 mus needs to be subtracted according to GTP/GRI output conditions of different Rowland C analog sources;

s5, the process of antenna delay calibration is as follows:

generating a Rowland C signal through a Rowland C analog source, wherein the Rowland C signal is coupled into an antenna placed in an antenna radiation cylinder through the antenna radiation cylinder, the Rowland C analog source is connected with the antenna in the antenna radiation cylinder through the Rowland C signal, and the antenna radiation cylinder is used for reducing external electromagnetic interference, wherein the Rowland C signal is a Rowland C signal with the frequency of 100KHz, and if space radiation is adopted, the Rowland C signal is easily interfered by the second harmonic of alternating current and the whole electromagnetic environment of the space, so that the antenna delay is calibrated by adopting a shielding antenna radiation cylinder in order to reduce the external electromagnetic interference;

and step two, the Roland C receiver receives the signal through the receiving antenna to generate a corresponding GTP/GRI signal, the time delay of the antenna is calibrated by comparing the difference value of the GTP/GRI signal of the Roland C analog source and the GTP/GRI signal of the Roland C receiver in time, wherein the Roland C analog source is connected to a channel A of a time interval counter through the GTP/GRI signal, one end of the Roland C receiver is connected with the receiving antenna, the receiving antenna is connected with the antenna in the antenna radiation cylinder through a signal, and the Roland C receiver is connected to a channel B of the time interval counter through the GTP/GRI signal.

When in specific use, a person skilled in the art connects the Rowland C analog source, the Rowland C receiver, the time interval counter, the antenna radiation cylinder and the receiving antenna, and after the connection, the antenna is placed in the antenna radiation cylinder, and the antenna radiation cylinder can be laid flat, and energizing the Rowland C analog source, the Rowland C receiver, and the time interval counter, setting the Rowland C analog source signal level output, setting the group repetition period, wherein the time delay of the Rowland C receiver is calibrated, the trigger levels of the channel A and the channel B of the time interval counter are set to be 1V, the rising edge triggers, and generally as a default, the time interval counter is set to time measurement, after the loran C receiver is normally locked, the reading on the time interval counter is recorded after waiting for 5 minutes, the time delay value of the antenna is obtained, wherein whether the time delay value needs to be subtracted by 30 mus is determined according to GTP/GRI output conditions of different Rowland C analog sources;

the antenna delay calibration process is as follows:

the Rowland C analog source generates a Rowland C signal, the Rowland C signal is coupled into an antenna arranged in an antenna radiation cylinder through the antenna radiation cylinder, the Rowland C receiver receives the signal through a receiving antenna to generate a corresponding GTP/GRI signal, and the time delay of the antenna is calibrated by comparing the difference of the GTP/GRI signal of the Rowland C analog source and the GTP/GRI signal of the Rowland C receiver in time.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.