CN106896347B - A method of generating scanning signal in microwave landing bearing signal - Google Patents
A method of generating scanning signal in microwave landing bearing signal Download PDFInfo
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- CN106896347B CN106896347B CN201710148710.2A CN201710148710A CN106896347B CN 106896347 B CN106896347 B CN 106896347B CN 201710148710 A CN201710148710 A CN 201710148710A CN 106896347 B CN106896347 B CN 106896347B
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Abstract
The invention discloses a kind of methods of scanning signal in generation microwave landing bearing signal, and realization step of the invention is: (1) constructing Gaussian waveform model；(2) Gaussian waveform value is obtained；(3) Gaussian waveform value is handled；(4) particular parameter value in microwave landing bearing signal is obtained；(5) microwave landing bearing signal is generated.The scanning signal that the present invention generates declines precipitous at peak value, and directionality is preferable, strong antijamming capability, can reduce error brought by system emulation, improves system accuracy.
Description
Technical field
The invention belongs to fields of communication technology, further relate to one in multimode navigation integrated test system technical field
The method that kind generates scanning signal in microwave landing bearing signal.The present invention can be used for generating bearing signal, reverse signal, height
Scanning signal in fast bearing signal.
Background technique
Microwave landing system is that one kind is suitble to round-the-clock precision landing system, using non-visually into nearly landing guidance skill
Art has many advantages, such as high reliablity, strong antijamming capability, expansible new function, is able to satisfy the demand on different machines and airport.It is micro-
The ground installation and airborne equipment configuration categories of wave landing system are various, and the signal frequency range of ground installation transmitting is wide, guides
Type is more, slot requirements are stringent, format is complicated, dynamic range is big, thus airborne equipment is there are configuration categories are more, detection accuracy
It is required that the problems such as high.So when carrying out microwave landing simulation emulation, in system transmitting terminal, analog simulation realize microwave continental rise
The required precision of defined must strictly be met when this guidance signal.
In order to realize angle measurement, the electric scanning signal for needing a phased array antenna to generate carries out in the ratio area of coverage
Round-trip scanning, the clockwise scanning of wave beam are known as toward scanning, and scanning counterclockwise is known as returning scanning, there is one between twice sweep
The delicate idle hours of fixed 600.Within a complete scan period, the airboarne receiver into nearly landing aircraft is detected
" past " " returning " two pulses.In received " past " " returning " scanning pulse of analog receiver, pulse envelope is scanning signal direction
The embodiment of figure on a timeline.
Paper " microwave landing system scanning antenna Directional Pattern Analysis " (" modern thunder that Wang Wei, Deng Ning et al. are delivered at it
Up to " periodical .2013.11) in propose a kind of production method of scanning signal in microwave landing system.Taylor is used in this method proposition
Antenna radiation pattern carrys out analog scanning antenna radiation pattern, and further design direction figure calculates synthesizer to obtain scanning signal.It should
Shortcoming existing for method is: Taylor's figuration data handling procedure of scanning beam is relative complex in microwave landing system, institute
The scanning antenna directional diagram directionality of design is poor.
Master's thesis " research of microwave landing system analog signal and FPGA are realized " (Xi'an electricity that Su Pengda is delivered at it
Sub- University of Science and Technology Master's thesis .2013.11) in propose a kind of scanning signal generation side about microwave landing simulation signal
Method.This method proposes that the pulse envelope form of scanning signal is sinx/x, and scanning letter is obtained using the method for searching tables of data
Number.Shortcoming existing for this method is: being declined at peak value slowly with the scanning signal that sin x/x function generates, it is difficult to full
The requirement of pedal system confidence level.
Summary of the invention
The purpose of the present invention is in view of the deficiency of the prior art, propose a kind of generation microwave landing bearing signal
The method of middle scanning signal can reduce system emulation error, meet the requirement of system confidence level.
To achieve the above object, the invention mainly comprises the following steps:
(1) according to the following formula, Gaussian waveform model is constructed:
Wherein, f (θ) indicate Gaussian waveform model, θ indicate Gaussian waveform model angle, θ value range be [- 8 π, 8
π], e(·)It indicates using natural constant e as the index operation at bottom, k indicates constant, and k=2ln2, ln () expression are with natural constant e
The log operations at bottom, BWIndicate the 3dB beam angle in microwave landing system scanning antenna directional diagram, BW=3.5；
(2) Gaussian waveform value is obtained:
(2a) according to the following formula, calculates separately the angle time point corresponding Gauss of the Gaussian waveform model selected by each
The angle value of waveform model:
Wherein, θnIndicate the angle time point corresponding Gaussian waveform model of n-th selected of Gaussian waveform model
Angle value, the time point of the angle of n expression Gaussian waveform model, n=0,1,2,3 ... 11400, * indicates multiplication operations；
(2b) is by the angle of the angle time point corresponding Gaussian waveform model of the Gaussian waveform model selected by each
Value substitutes into Gaussian waveform model respectively, obtains 0,1,2,3 ..., all Gaussian waveform values in 11400 ranges；
(3) Gaussian waveform value is handled:
(3a) in the range of 11400, is normalized all Gaussian waveform values respectively 0,1,2,3 ...；
Each Gaussian waveform value after normalizing is amplified 32767 times by (3b)；
(3c) is rounded each amplified Gaussian waveform value；
Gaussian waveform integer value after each metric rounding is converted to the integer value of hexadecimal format by (3d),
And it is stored in txt file；
(4) particular parameter value in microwave landing bearing signal is obtained:
(4a) according to microwave landing bearing signal time slot allocation format, within the scope of 0 millisecond to 1.600 milliseconds, in the past
It is reference value that carrier wave in leading code, which intercepts and captures section, carries out difference volume with identification of function code to the receiver fiducial time code in lead code
Code；
(4b) is successively read according to hexadecimal format and is stored in each of txt file data, obtains all sweep
Retouch signal value；
(4c) is successively read each scanning signal value within the scope of 2.560 milliseconds to 8.760 milliseconds, obtains " past " and sweeps
Retouch signal；
(4d) is successively read each scanning signal value within the scope of 9.360 milliseconds to 15.560 milliseconds, obtains " returning " and sweeps
Retouch signal；
(5) microwave landing bearing signal is generated:
Microwave landing orientation is believed using time-division multiplexing method according to the time slot allocation format of microwave landing bearing signal
The microwave of specified parameter value in number and the receiver fiducial time code after differential encoding, identification of function code synthesis complete function
Landing bearing signal.
The present invention compared with prior art, has the advantage that
First, Gaussian waveform model of the present invention generates scanning signal in microwave landing bearing signal, overcomes
Decline at peak value slowly with the scanning signal that sinx/x function generates in the prior art, it is difficult to meet system confidence level and require
Defect, decline the scanning signal that generates of the present invention at peak value precipitous, directionality is preferable, strong antijamming capability, can drop
Error brought by low system emulation improves system accuracy.
Second, the present invention has carried out the processing of normalization, amplification, rounding and system conversion to Gaussian waveform value, overcomes
The relative complex defect of Taylor's figuration data handling procedure of microwave landing system scanning beam in the prior art, makes tool of the present invention
There is the advantages of data handling procedure is simple, strong operability.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
1 pair of specific implementation step of the invention is further described with reference to the accompanying drawing.
Step 1, according to the following formula, Gaussian waveform model is constructed.
Wherein, f (θ) indicate Gaussian waveform model, θ indicate Gaussian waveform model angle, θ value range be [- 8 π, 8
π], e(·)It indicates using natural constant e as the index operation at bottom, k indicates constant, and k=2ln2, ln () expression are with natural constant e
The log operations at bottom, BWIndicate the 3dB beam angle in microwave landing system scanning antenna directional diagram, BW=3.5.
Step 2, Gaussian waveform value is obtained.
The first step, according to the following formula, the angle time point for calculating separately the Gaussian waveform model selected by each are corresponding
The angle value of Gaussian waveform model:
Wherein, θnIndicate the angle time point corresponding Gaussian waveform model of n-th selected of Gaussian waveform model
Angle value, the time point of the angle of n expression Gaussian waveform model, n=0,1,2,3 ... 11400, * indicates multiplication operations；
Second step, by the angle of the angle time point corresponding Gaussian waveform model of the Gaussian waveform model selected by each
Angle value is substituted into respectively in Gaussian waveform model, obtains 0,1,2,3 ..., all Gaussian waveform values in 11400 ranges.
Step 3, Gaussian waveform value is handled.
In the range of 11400, place is normalized to all Gaussian waveform values to 0,1,2,3 ... in the first step respectively
Reason；
Second step, the Gaussian waveform value after each is normalized amplify 32767 times；
Third step is rounded each amplified Gaussian waveform value；
Gaussian waveform value integer value after each metric rounding is converted to the whole of hexadecimal format by the 4th step
Numerical value, and be stored in txt file.
Step 4, the particular parameter value in microwave landing bearing signal is obtained.
The first step, according to the time slot allocation format of microwave landing bearing signal, within the scope of 0 millisecond to 1.6 milliseconds, in the past
It is reference value that carrier wave in leading code, which intercepts and captures section, carries out difference volume with identification of function code to the receiver fiducial time code in lead code
Code；
Second step is successively read according to hexadecimal format and is stored in each of txt file data, owned
Scanning signal value；
Third step is successively read each scanning signal value, obtains " past " within the scope of 2.560 milliseconds to 8.760 milliseconds
Scanning signal；
4th step is successively read each scanning signal value, obtains within the scope of 9.360 milliseconds to 15.560 milliseconds
" returning " scanning signal；
The time slot allocation format of the microwave landing bearing signal is as follows:
Time shared by lead code is between 0 millisecond to 1.6 milliseconds；Wherein, lead code includes that carrier wave intercepts and captures section, receiver base
Quasi- timing code and identification of function code；
Time shared by SIC station identification code is between 1.6 milliseconds to 1.664 milliseconds；
Time shared by antenna strobe pulse is between 1.664 milliseconds to 2.048 milliseconds；
The time shared by signal is between 2.048 milliseconds to 2.176 milliseconds after outside the area of coverage；
Time shared by the outer left signal of the area of coverage is between 2.176 milliseconds to 2.304 milliseconds；
Time shared by the outer right signal of the area of coverage is between 2.304 milliseconds to 2.432 milliseconds；
" toward " checks that the time shared by pulse is between 2.432 milliseconds to 2.560 milliseconds；
Time shared by " toward " scanning signal is between 2.560 milliseconds to 8.760 milliseconds；
Time shared by resting is between 8.760 milliseconds to 9.360 milliseconds；
Time shared by " returning " scanning signal is between 9.360 milliseconds to 15.560 milliseconds；
" returning " checks that the time shared by pulse is between 15.560 milliseconds to 15.688 milliseconds；
Time shared by ending guard time is between 15.688 milliseconds to 15.900 milliseconds.
Step 5, microwave landing bearing signal is generated.
Microwave landing orientation is believed using time-division multiplexing method according to the time slot allocation format of microwave landing bearing signal
The microwave of specified parameter value in number and the receiver fiducial time code after differential encoding, identification of function code synthesis complete function
Landing bearing signal.
Specified parameter value in the microwave landing bearing signal refers to that SIC station identification code, covers antenna strobe pulse
When the outer left signal of signal, the area of coverage, the outer right signal of the area of coverage, " past " inspection pulse, " returning " check pulse, tail protection after outside area
Between, " past " scanning signal, " returning " scanning signal.
Claims (3)
1. a kind of method for generating scanning signal in microwave landing bearing signal, includes the following steps:
(1) according to the following formula, Gaussian waveform model is constructed:
Wherein, f (θ) indicates that Gaussian waveform model, θ indicate that the angle of Gaussian waveform model, θ value range are [- 8 π, 8 π], e(·)
It indicates using natural constant e as the index operation at bottom, k indicates that constant, k=2ln2, ln () are indicated using natural constant e as pair at bottom
Number operation, BWIndicate the 3dB beam angle in microwave landing system scanning antenna directional diagram, BW=3.5；
(2) Gaussian waveform value is obtained:
(2a) according to the following formula, calculates separately the angle time point corresponding Gaussian waveform of the Gaussian waveform model selected by each
The angle value of model:
Wherein, θnIndicate the angle of the angle time point corresponding Gaussian waveform model of n-th selected of Gaussian waveform model
Value, n indicate the time point of the angle of Gaussian waveform model, and n=0,1,2,3 ..., 11400, * indicate multiplication operations；
(2b) is by the angle value point of the angle time point corresponding Gaussian waveform model of the Gaussian waveform model selected by each
0,1,2,3 Dai Ru not be obtained ..., all Gaussian waveform values in 11400 ranges in Gaussian waveform model；
(3) Gaussian waveform value is handled:
(3a) in the range of 11400, is normalized all Gaussian waveform values respectively 0,1,2,3 ...；
Each Gaussian waveform value after normalizing is amplified 32767 times by (3b)；
(3c) is rounded each amplified Gaussian waveform value；
Gaussian waveform integer value after each metric rounding is converted to the integer value of hexadecimal format by (3d), and is protected
There are in txt file；
(4) particular parameter value in microwave landing bearing signal is obtained:
(4a) according to microwave landing bearing signal time slot allocation format, within the scope of 0 millisecond to 1.600 milliseconds, with lead code
In carrier wave intercept and capture section be reference value, in lead code receiver fiducial time code with identification of function code carry out differential encoding；
(4b) is successively read according to hexadecimal format and is stored in each of txt file data, obtains all scanning letters
Number value；
(4c) is successively read each scanning signal value within the scope of 2.560 milliseconds to 8.760 milliseconds, obtains " past " scanning letter
Number；
(4d) is successively read each scanning signal value within the scope of 9.360 milliseconds to 15.560 milliseconds, obtains " returning " scanning letter
Number；
(5) microwave landing bearing signal is generated:
It will be in microwave landing bearing signal using time-division multiplexing method according to the time slot allocation format of microwave landing bearing signal
Specified parameter value and differential encoding after receiver fiducial time code, identification of function code synthesis complete function microwave land
Bearing signal.
2. a kind of method for generating scanning signal in microwave landing bearing signal according to claim 1, which is characterized in that
The time slot allocation format of microwave landing bearing signal described in step (4a), step (5) is as follows:
Time shared by lead code is between 0 millisecond to 1.600 milliseconds；Wherein, lead code includes that carrier wave intercepts and captures section, receiver benchmark
Timing code and identification of function code；
Time shared by SIC station identification code is between 1.600 milliseconds to 1.664 milliseconds；
Time shared by antenna strobe pulse is between 1.664 milliseconds to 2.048 milliseconds；
The time shared by signal is between 2.048 milliseconds to 2.176 milliseconds after outside the area of coverage；
Time shared by the outer left signal of the area of coverage is between 2.176 milliseconds to 2.304 milliseconds；
Time shared by the outer right signal of the area of coverage is between 2.304 milliseconds to 2.432 milliseconds；
" toward " checks that the time shared by pulse is between 2.432 milliseconds to 2.560 milliseconds；
Time shared by " toward " scanning signal is between 2.560 milliseconds to 8.760 milliseconds；
Time shared by resting is between 8.760 milliseconds to 9.360 milliseconds；
Time shared by " returning " scanning signal is between 9.360 milliseconds to 15.560 milliseconds；
" returning " checks that the time shared by pulse is between 15.560 milliseconds to 15.688 milliseconds；
Time shared by ending guard time is between 15.688 milliseconds to 15.900 milliseconds.
3. a kind of method for generating scanning signal in microwave landing bearing signal according to claim 1, which is characterized in that
Specified parameter value in microwave landing bearing signal described in step (5) refers to that SIC station identification code, covers antenna strobe pulse
When the outer left signal of signal, the area of coverage, the outer right signal of the area of coverage, " past " inspection pulse, " returning " check pulse, tail protection after outside cover region
Between, " past " scanning signal, " returning " scanning signal.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5254998A (en) * | 1992-11-02 | 1993-10-19 | Allied-Signal Inc. | Executive monitor for microwave landing system |
| CN103529434A (en) * | 2013-09-30 | 2014-01-22 | 中国电子科技集团公司第二十研究所 | Angle measurement accuracy analysis method for microwave landing receiver |
| CN103900615A (en) * | 2014-04-16 | 2014-07-02 | 中国人民解放军空军航空仪器设备计量总站 | Microwave landing simulator metering method and microwave landing simulator metering device |
| CN104515974A (en) * | 2014-12-10 | 2015-04-15 | 中国电子科技集团公司第二十研究所 | Processing method of microwave landing airborne equipment angle and ranging data |
-
2017
- 2017-03-14 CN CN201710148710.2A patent/CN106896347B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5254998A (en) * | 1992-11-02 | 1993-10-19 | Allied-Signal Inc. | Executive monitor for microwave landing system |
| CN103529434A (en) * | 2013-09-30 | 2014-01-22 | 中国电子科技集团公司第二十研究所 | Angle measurement accuracy analysis method for microwave landing receiver |
| CN103900615A (en) * | 2014-04-16 | 2014-07-02 | 中国人民解放军空军航空仪器设备计量总站 | Microwave landing simulator metering method and microwave landing simulator metering device |
| CN104515974A (en) * | 2014-12-10 | 2015-04-15 | 中国电子科技集团公司第二十研究所 | Processing method of microwave landing airborne equipment angle and ranging data |
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