阅读说明：本技术 一种测量捷联被动反辐射导引头输出延时的方法及系统 (Method and system for measuring output delay of strapdown passive anti-radiation seeker ) 是由 王明光 宗焕强 李广 魏丽霞 赵凌雪 王晓燕 李世海 崔俊根 于 2021-06-22 设计创作，主要内容包括：本发明公布了一种测量捷联被动反辐射导引头输出延时的方法,对于捷联被动反辐射制导来说,需要基于弹体姿态解算得到惯性坐标系下的视线角,故在工程上需要对导引头输出信号与导航姿态角在时间上进行对齐,导引头输出延时的精确性则在很大程度上影响制导品质。本发明基于简易的测试平台,针对被动反辐射导引头在不同工作状态下输出不同标志位的特性,利用示波器测量目标雷达发射电磁信号到导引头输出锁定标志位之间的时间差精确得到导引头输出延时,基于精确的输出延时可以获得高品质制导,提高制导精度。(The invention discloses a method for measuring output delay of a strapdown passive anti-radiation seeker. Based on a simple test platform, aiming at the characteristic that the passive anti-radiation seeker outputs different zone bits under different working states, the time difference between the electromagnetic signal transmitted by the target radar and the output locking zone bit of the seeker is measured by the oscilloscope, so that the output delay of the seeker is accurately obtained, high-quality guidance can be obtained based on the accurate output delay, and the guidance precision is improved.)

1. A method for measuring output delay of a strapdown passive anti-radiation seeker is characterized by comprising the following steps:

(1) building an output delay test system;

(2) a first channel probe of the oscilloscope is accessed to an SPST switch signal, and a second channel probe of the oscilloscope is accessed to an RS422 signal output by the seeker;

(3) setting a signal source;

(4) setting a signal generator;

(5) driving the SPST switch;

(6) powering on the equipment, carrying out power-on self-test on the seeker, binding a radar library for the seeker, and driving the seeker to be in a searching state;

(7) taking the rising edge of the modulation signal as an oscilloscope trigger source;

(8) operating a signal source to emit an electromagnetic signal;

(9) checking the real-time running condition through an oscilloscope;

(10) debugging a first channel of the oscilloscope, and aligning the time axis of the oscilloscope with the front edge of the modulation signal;

(11) debugging a second channel of the oscilloscope, checking an RS422 signal in the second channel by using a serial port protocol decoding function of the digital oscilloscope, and searching first frame RS422 data of which the state bit of the seeker output frame is changed from a lost electromagnetic signal flag bit 0xC3 to a locked electromagnetic signal flag bit 0xB 3;

(12) the time between the rising edge of the modulation signal and the frame header with the first frame status bit of 0xB3 is measured, i.e. the leader output delay.

2. The method for measuring the output delay of the strapdown passive anti-radiation seeker of claim 1, wherein the method comprises the following steps: the output delay test system comprises a signal source, a signal generator, an oscilloscope, an SPST switch, a transmitting antenna, a seeker and a power supply;

the power supply supplies power to the seeker, a second channel of the oscilloscope is connected with the seeker through an RS422 bus, a first channel of the oscilloscope is connected with the output end of the SPST switch, the signal source is connected with the input end of the SPST switch and provides a transmitting signal, the signal generator is also connected with the input end of the SPST switch and provides a modulating signal; the output end of the SPST switch is connected with a transmitting antenna; the distance between the transmitting antenna and the seeker meets the electromagnetic far field condition.

3. The method for measuring the output delay of the strapdown passive anti-radiation seeker of claim 2, wherein the method comprises the following steps: the electromagnetic far field condition specifically refers to:

centered on the field source and having a radiusThe spatial range of (a) is the far field, where λ is the wavelength, D is the antenna diameter, and the minimum distance between the transmitting antenna and the seeker is r.

4. The method for measuring the output delay of the strapdown passive anti-radiation seeker of claim 1, wherein the method comprises the following steps: the signal source setting specifically comprises the following steps: setting a transmitting signal provided by a signal source as a dot frequency pulse signal, setting a carrier frequency to be 10GHz, a pulse width to be 10us and a repetition period to be 100us, and setting transmitting power of the signal source to enable a seeker to receive an electromagnetic signal and to be positioned within sensitivity of the seeker.

5. The method for measuring the output delay of the strapdown passive anti-radiation seeker of claim 1, wherein the method comprises the following steps: the setting signal generator is specifically: and outputting a modulation signal with the period of 1000ms and the duty ratio of 80%.

6. The method for measuring the output delay of the strapdown passive anti-radiation seeker of claim 1, wherein the method comprises the following steps: the output frame status bit 0xC3 is defined as: a lost electromagnetic signal; the output frame status bit 0xB3 is defined as: the electromagnetic signal is locked.

7. A system for measuring the output delay of a strapdown passive anti-radiation seeker, which is implemented according to the method for measuring the output delay of the strapdown passive anti-radiation seeker disclosed by the claim 1, and is characterized by comprising the following steps:

the delay test system builds a module: an output delay test system is set up, and the system comprises a signal source, a signal generator, an oscilloscope, an SPST switch, a transmitting antenna, a seeker and a power supply;

the power supply supplies power to the seeker, a second channel of the oscilloscope is connected with the seeker through an RS422 bus, a first channel of the oscilloscope is connected with the output end of the SPST switch, the signal source is connected with the input end of the SPST switch and provides a transmitting signal, the signal generator is also connected with the input end of the SPST switch and provides a modulating signal; the output end of the SPST switch is connected with a transmitting antenna; the distance between the transmitting antenna and the seeker meets the electromagnetic far field condition;

an equipment setting module: a first channel probe of the oscilloscope is accessed to an SPST switch signal, and a second channel probe of the oscilloscope is accessed to an RS422 signal output by the seeker; setting a signal source; setting a signal generator; driving the SPST switch; powering on the equipment, carrying out power-on self-test on the seeker, binding a radar library for the seeker, and driving the seeker to be in a searching state; taking the rising edge of the modulation signal as an oscilloscope trigger source;

a debugging module: operating a signal source to emit an electromagnetic signal; checking the real-time running condition through an oscilloscope; debugging a first channel of the oscilloscope, and aligning the time axis of the oscilloscope with the front edge of the modulation signal; debugging a second channel of the oscilloscope, checking an Rs422 signal in the second channel by using a serial port protocol decoding function of the digital oscilloscope, and searching first frame RS422 data of which the state bit of the seeker output frame is changed from a lost electromagnetic signal flag bit 0xC3 to a locked electromagnetic signal flag bit 0xB 3;

the seeker outputs a delay determination module: the time between the rising edge of the modulation signal and the frame header with the first frame status bit of 0xB3 is measured, i.e. the leader output delay.

8. The system for measuring the output delay of a strapdown passive anti-radiation seeker of claim 7, wherein: the electromagnetic far field condition specifically refers to:

centered on the field source and having a radiusThe spatial range of (a) is the far field, where λ is the wavelength, D is the antenna diameter, and the minimum distance between the transmitting antenna and the seeker is r.

9. The system for measuring the output delay of a strapdown passive anti-radiation seeker of claim 7, wherein: the signal source setting specifically comprises the following steps: setting a transmitting signal provided by a signal source as a dot frequency pulse signal, setting a carrier frequency to be 10GHz, a pulse width to be 10us and a repetition period to be 100us, and setting transmitting power of the signal source to enable a seeker to receive an electromagnetic signal and to be positioned within sensitivity of the seeker.

10. The system for measuring the output delay of a strapdown passive anti-radiation seeker of claim 7, wherein: the setting signal generator is specifically: outputting a modulation signal with the cycle of 1000ms and the duty ratio of 80%; the output frame status bit 0xC3 is defined as: a lost electromagnetic signal; the output frame status bit 0xB3 is defined as: the electromagnetic signal is locked.

Technical Field

The invention relates to a method and a system for measuring output delay of a strapdown passive anti-radiation seeker, and belongs to the technical field of strapdown passive anti-radiation guidance.

Background

The output delay of the strapdown passive anti-radiation seeker is defined as the time difference between the time when the seeker receives the electromagnetic signals and the time when the seeker outputs the processed information, the output delay is mainly determined by the channel transmission time, the processing time of the receiving extension set on the signals, the working time of the signal processing system on sorting, identifying and the like of the signals, and the results are uploaded to an missile-borne computer and the like. Since each signal processing has a certain deviation, the delay time is also one interval.

For a guidance system of a strapdown type seeker, the output delay time of the seeker needs to be determined, and the reasons are as follows: the output of the seeker is a high-low angle and an azimuth angle under a seeker coordinate system, the guidance law is a high-low angle and an azimuth angle of an inertial coordinate system, the high-low angle and the azimuth angle are obtained based on missile attitude decoupling calculation, so that the output signal of the seeker and a navigation attitude angle need to be aligned in time in engineering, if the difference between the high-low angle and the azimuth angle of the inertial coordinate system obtained based on missile decoupling calculation is large in time, the deviation amount of the high-low angle and the azimuth angle of the inertial coordinate system obtained based on missile decoupling calculation has deviation amount, the deviation amount of the guidance instruction causes additional change of missile attitude, and the deviation amount of the high-low angle and the azimuth angle under the inertial coordinate system obtained through calculation is further enlarged due to the additional attitude change.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the characteristic that the passive anti-radiation seeker outputs different state bits under different working states, a locking flag bit is output when an electromagnetic signal is locked, a lost flag bit is output when the electromagnetic signal is lost, and the output delay of the passive anti-radiation seeker can be accurately measured by using a digital oscilloscope based on a switch modulation signal.

The technical solution of the invention is as follows:

a method for measuring output delay of a strapdown passive anti-radiation seeker comprises the following steps:

(1) building an output delay test system;

(2) a first channel probe of the oscilloscope is accessed to an SPST switch signal, and a second channel probe of the oscilloscope is accessed to an RS422 signal output by the seeker;

(3) setting a signal source;

(4) setting a signal generator;

(5) driving the SPST switch;

(6) powering on the equipment, carrying out power-on self-test on the seeker, binding a radar library for the seeker, and driving the seeker to be in a searching state;

(7) taking the rising edge of the modulation signal as an oscilloscope trigger source;

(8) operating a signal source to emit an electromagnetic signal;

(9) checking the real-time running condition through an oscilloscope, and recording the instantaneous waveform of the oscilloscope;

(10) debugging a first channel of the oscilloscope, and aligning the time axis of the oscilloscope with the front edge of the modulation signal;

(11) debugging a second channel of the oscilloscope, checking an RS422 signal in the second channel by using a serial port protocol decoding function of the digital oscilloscope, and searching first frame RS422 data of which the state bit of the seeker output frame is changed from a lost electromagnetic signal flag bit 0xC3 to a locked electromagnetic signal flag bit 0xB 3;

(12) the time between the rising edge of the modulation signal and the frame header with the first frame status bit of 0xB3 is measured, i.e. the leader output delay.

Furthermore, the output delay test system comprises a signal source, a signal generator, an oscilloscope, an SPST switch, a transmitting antenna, a seeker and a power supply;

the power supply supplies power to the seeker, a second channel of the oscilloscope is connected with the seeker through an RS422 bus, a first channel of the oscilloscope is connected with the output end of the SPST switch, the signal source is connected with the input end of the SPST switch and provides a transmitting signal, the signal generator is also connected with the input end of the SPST switch and provides a modulating signal; the output end of the SPST switch is connected with a transmitting antenna; the distance between the transmitting antenna and the seeker meets the electromagnetic far field condition.

Further, the electromagnetic far-field condition specifically refers to:

centered on the field source and having a radiusThe spatial range of (a) is the far field, where λ is the wavelength, D is the antenna diameter, and the minimum distance between the transmitting antenna and the seeker is r.

Further, the signal source is specifically set as follows: setting a transmitting signal provided by a signal source as a dot frequency pulse signal, setting a carrier frequency to be 10GHz, a pulse width to be 10us and a repetition period to be 100us, and setting transmitting power of the signal source to enable a seeker to receive an electromagnetic signal and to be positioned within sensitivity of the seeker.

Further, the setting signal generator is specifically: and outputting a modulation signal with the period of 1000ms and the duty ratio of 80%.

Further, the output frame status bit 0xC3 is defined as: a lost electromagnetic signal; the output frame status bit 0xB3 is defined as: the electromagnetic signal is locked.

Furthermore, the invention also provides a system for measuring the output delay of the strapdown passive anti-radiation seeker, which comprises:

the delay test system builds a module: an output delay test system is set up, and the system comprises a signal source, a signal generator, an oscilloscope, an SPST switch, a transmitting antenna, a seeker and a power supply;

the power supply supplies power to the seeker, a second channel of the oscilloscope is connected with the seeker through an RS422 bus, a first channel of the oscilloscope is connected with the output end of the SPST switch, the signal source is connected with the input end of the SPST switch and provides a transmitting signal, the signal generator is also connected with the input end of the SPST switch and provides a modulating signal; the output end of the SPST switch is connected with a transmitting antenna; the distance between the transmitting antenna and the seeker meets the electromagnetic far field condition;

an equipment setting module: a first channel probe of the oscilloscope is accessed to an SPST switch signal, and a second channel probe of the oscilloscope is accessed to an RS422 signal output by the seeker; setting a signal source; setting a signal generator; driving the SPST switch; powering on the equipment, carrying out power-on self-test on the seeker, binding a radar library for the seeker, and driving the seeker to be in a searching state; taking the rising edge of the modulation signal as an oscilloscope trigger source;

a debugging module: operating a signal source to emit an electromagnetic signal; checking the real-time running condition through an oscilloscope; debugging a first channel of the oscilloscope, and aligning the time axis of the oscilloscope with the front edge of the modulation signal; debugging a second channel of the oscilloscope, checking an RS422 signal in the second channel by using a serial port protocol decoding function of the digital oscilloscope, and searching first frame RS422 data of which the state bit of the seeker output frame is changed from a lost electromagnetic signal flag bit 0xC3 to a locked electromagnetic signal flag bit 0xB 3;

the seeker outputs a delay determination module: the time between the rising edge of the modulation signal and the frame header with the first frame status bit of 0xB3 is measured, i.e. the leader output delay.

Compared with the prior art, the invention has the beneficial effects that:

(1) aiming at the characteristic that the passive anti-radiation seeker outputs different state bits under different working states, the output delay of the passive anti-radiation seeker can be accurately measured by using a digital oscilloscope based on a switch modulation signal.

(2) Aiming at the characteristic that the seeker outputs different zone bits under different working states, a simple measuring platform is built by using common testing equipment, and the method is easy to realize in engineering; the test method is simple and convenient, has clear physical significance and is convenient to understand;

(3) the output delay of the measuring seeker can reach high precision, is better than 0.1ms, and meets the guidance requirement.

Drawings

FIG. 1 is a schematic diagram of an output delay test system;

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

For strapdown passive anti-radiation guidance, a sight line angle under an inertial coordinate system needs to be obtained through calculation based on the missile attitude, the guidance quality is influenced to a great extent by the accuracy of output delay of a seeker, and therefore the output signal of the seeker needs to be aligned with the navigation attitude angle in time in engineering. Aiming at the characteristic that the passive anti-radiation seeker outputs different state bits under different working states, the locking flag bit is output when the electromagnetic signal is locked, the lost flag bit is output when the electromagnetic signal is lost, and the output delay of the passive anti-radiation seeker can be accurately measured by using a digital oscilloscope based on a switch modulation signal.

Aiming at the characteristic that the seeker outputs different zone bits under different working states, a simple measuring platform is built by common testing equipment, two testing channels of a digital oscilloscope are respectively connected with a transmitting electromagnetic signal and seeker output serial port signals (containing zone bits such as a locking electromagnetic signal and a losing electromagnetic signal), the time difference between the transmitting electromagnetic signal and the seeker output serial port signals is measured in time, and seeker output delay is accurately obtained.

The invention is implemented by the following steps:

(1) and (3) arranging the devices to be tested according to the figure 1, and constructing an output delay testing system.

The output delay test system comprises a signal source, a signal generator, an oscilloscope, an SPST switch, a transmitting antenna, a seeker and a power supply;

the power supply supplies power to the seeker, a second channel of the oscilloscope is connected with the seeker through an RS422 bus, a first channel of the oscilloscope is connected with the output end of the SPST switch, the signal source is connected with the input end of the SPST switch and provides a transmitting signal, the signal generator is also connected with the input end of the SPST switch and provides a modulating signal; the output end of the SPST switch is connected with a transmitting antenna; wherein, the distance between the transmitting antenna and the seeker meets the electromagnetic far field condition.

Specifically, the electromagnetic far field condition specifically means:

centered on the field source and having a radiusSpace (A) ofThe range is the far field, where λ is the wavelength, D is the antenna diameter, and the minimum distance between the transmitting antenna and the seeker is r.

(2) A first channel probe of the oscilloscope is accessed to an SPST switch signal, and a second channel probe of the oscilloscope is accessed to an RS422 signal output by the seeker; the SPST switch is referred to as a single pole, single throw switch.

(3) A signal source is set.

Setting a transmitting signal as a point frequency pulse signal, setting a carrier frequency to be 10GHz, a pulse width to be 10us and a repetition period to be 100us, and setting the transmitting power of a signal source to enable a seeker to receive an electromagnetic signal and to be positioned within the sensitivity of the seeker;

(4) a signal generator is provided.

Outputting a modulation signal with the cycle of 1000ms and the duty ratio of 80%;

(5) driving the SPST switch;

(6) powering on various devices, powering on the seeker for self-checking, binding a radar library for the seeker by using a task machine, and driving the seeker to be in a searching state;

(7) the rising edge of the modulation signal is used as an oscilloscope trigger source;

(8) operating a signal source to emit an electromagnetic signal;

(9) clicking a run key of the oscilloscope to check the real-time running condition;

(10) clicking a stop key of the oscilloscope, capturing the screen of the oscilloscope, and recording the instantaneous waveform of the oscilloscope;

(11) debugging a first channel of the oscilloscope, and aligning the time axis of the oscilloscope with the front edge of the modulation signal;

(12) debugging a second channel of the oscilloscope, checking an RS422 signal in the second channel by using a serial port protocol decoding function of the digital oscilloscope, and searching the RS422 data of a first frame of which the state bit of a seeker output frame is changed from 0xC3 (a lost electromagnetic signal flag bit) to 0xB3 (a locked electromagnetic signal flag bit);

(13) the time between the rising edge of the modulation signal and the frame header with the first frame status bit of 0xB3 is measured as the output delay.

Furthermore, the invention also provides a system for measuring the output delay of the strapdown passive anti-radiation seeker, which comprises:

the delay test system builds a module: an output delay test system is set up, and the system comprises a signal source, a signal generator, an oscilloscope, an SPST switch, a transmitting antenna, a seeker and a power supply;

the power supply supplies power to the seeker, a second channel of the oscilloscope is connected with the seeker through an RS422 bus, a first channel of the oscilloscope is connected with the output end of the SPST switch, the signal source is connected with the input end of the SPST switch and provides a transmitting signal, the signal generator is also connected with the input end of the SPST switch and provides a modulating signal; the output end of the SPST switch is connected with a transmitting antenna; the distance between the transmitting antenna and the seeker meets the electromagnetic far field condition;

an equipment setting module: a first channel probe of the oscilloscope is accessed to an SPST switch signal, and a second channel probe of the oscilloscope is accessed to an RS422 signal output by the seeker; setting a signal source; setting a signal generator; driving the SPST switch; powering on the equipment, carrying out power-on self-test on the seeker, binding a radar library for the seeker, and driving the seeker to be in a searching state; taking the rising edge of the modulation signal as an oscilloscope trigger source;

a debugging module: operating a signal source to emit an electromagnetic signal; checking the real-time running condition through an oscilloscope; debugging a first channel of the oscilloscope, and aligning the time axis of the oscilloscope with the front edge of the modulation signal; debugging a second channel of the oscilloscope, checking an RS422 signal in the second channel by using a serial port protocol decoding function of the digital oscilloscope, and searching first frame RS422 data of which the state bit of the seeker output frame is changed from a lost electromagnetic signal flag bit 0xC3 to a locked electromagnetic signal flag bit 0xB 3;

the seeker outputs a delay determination module: the time between the rising edge of the modulation signal and the frame header with the first frame status bit of 0xB3 is measured, i.e. the leader output delay.

Based on a simple test platform, aiming at the characteristic that the passive anti-radiation seeker outputs different zone bits under different working states, the time difference between the electromagnetic signal transmitted by the target radar and the output locking zone bit of the seeker is measured by the oscilloscope, so that the output delay of the seeker is accurately obtained; whether the electromagnetic signal is locked or not can be judged according to the characteristics that the passive anti-radiation seeker outputs different zone bits under different working states; high-quality guidance can be obtained based on accurate output delay, and guidance precision is improved.

Those matters not described in detail in the present specification are well known in the art.