Power state detection method

Abstract

The invention relates to the technical field of radar power detection, in particular to a power state detection method. According to the invention, whether the transmitter output power value and the receiver reflection power value are correct or not is judged by detecting the transmitter output power signal, the receiver reflection power signal and the radar working frequency point change signal, and the power value change trend of different frequency points is displayed. According to the method, the situation that power display of different frequency points is not matched or power abnormity is not early warned is avoided, the false alarm rate can be improved, and the stability of a radar system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of radar power detection technology, and in particular to a method for detecting a power state. Background Art

[0002] The operating frequency or band of the radar is determined according to the purpose of the radar. The operating frequency and working power of radars for different purposes are not the same. Generally, in order to improve the working performance and anti-interference ability of the radar system, it is sometimes required to operate at different frequencies, resulting in the radar transmitter output power and receiver reflection power not changing according to the frequency change. If the radar transmitter output power and receiver reflection power are abnormal, it will directly affect the performance of the radar, and in severe cases, it may burn other devices.

[0003] For example, during the output power test of a certain radar transmitter, when the radar changes the frequency, it is found that the output power of the radar C-band transmitter fluctuates too much, and it is impossible to determine which frequency has a power problem, resulting in the transmitter output power not being accurate enough and the status judgment not being fast enough, which will seriously affect the reliability of the radar transmitter. When testing the reflected power of the radar receiver, it is found that when the working frequency changes, the reflected power of the receiver changes at the same time, but it is impossible to determine whether the status is normal. In previous radar systems, all working frequencies often only display one transmitter output power value and receiver reflected power value, which reduces the false alarm rate and makes the stability of the radar system poor. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for detecting power status. The present invention calculates the transmitter output power value and the receiver reflection power value of all working frequencies by writing the coupling coefficients of all frequencies, which is conducive to judging the working status of the radar. The present invention avoids the situation where the power display of different frequencies does not match or the power abnormality is not warned in advance, and at the same time can improve the false alarm rate to ensure the stability of the radar system.

[0005] The technical solution of the present invention is: a method for detecting a power state, characterized in that:

[0006] Step 1: Initial coupling values ​​at each frequency point;

[0007] Step 2: Determine the degree of abnormality;

[0008] For a certain working frequency point, the power change abnormal level L X The calculation formula is:

[0009] L X The minimum is 1, for The last output power, L XTake the integer;

[0010] Step 3: Detect the actual output power value P of the transmitter 发射 and the actual receiver reflected power value P 接收 ;

[0011] Step 4: Determine the working frequency point conversion frequency for adaptive detection and determine the number of detection times N;

[0012] The calculation formula for the number of transmission detection times N at each frequency point is as follows:

[0013]

[0014] in Round off, Round, such as P 发射 When the power is between 100W and 199W, it is rounded to 1.

[0015] The calculation formula for the number of reception detection times N at each frequency point is as follows:

[0016]

[0017] in Round, such as T N-1 From 11 to 14 o'clock, Round to 1. Round, such as P 接收 When the power is between 100W and 199W, it is rounded to 1; T N-1 The number of times the frequency point worked in the previous cycle. The default value is 5 when starting.

[0018] Step 5: According to the N value calculated by the formula in step 4, increase or decrease the number of detection times N for a specific frequency point, repeat steps 2 to 4, and perform cyclic detection.

[0019] According to a power state detection method as described above, it is characterized in that: in step one, corresponding coupling value coefficients are written for different frequency points, the coupling value coefficients are determined according to different attenuator indicators, the attenuator indicators correspond to the attenuation values ​​of all frequency points, and the attenuation values ​​of all frequency points are calculated as the corresponding coupling value coefficient K.

[0020] According to the above-mentioned power state detection method, it is characterized in that: in step 2, L1-L F Indicates the degree of power state from small to large, with L F -L 01 Indicates the degree to which the power status changes from high to low.

[0021] According to the above-mentioned power state detection method, it is characterized in that: in step 3, when the power detection device receives the working frequency point change information, it performs actual power calculation, P实 =K×X, the actual output power value is P=(P 实1 +…+P 实N ) / N; when calculating the transmitter, it is the actual output power value of the transmitter P 发射 ; When calculating the receiver, it is the actual output power value of the transmitter P 接收 .

[0022] According to the power state detection method as described above, it is characterized in that: it also includes step six, adjusting the coupling value coefficient in the power detection device; adjusting the coupling value coefficient K according to the frequency band in which different radar products work.

[0023] The beneficial effects of the present invention are: the present invention improves the transmitter power detection accuracy to judge the power change trend and state, and provides early warning of the radar power state to play a prompting and protective role. This solves the problem that when the working frequency point of the previous radar product is switched, although the power changes, the power value of the frequency point cannot be accurately displayed, thereby affecting the state judgment. The radar transmitter output power and the receiver reflected power state are quickly judged, and the radar state change is warned in advance, which protects the radar device and improves the reliability of the radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the collection device of the present invention.

[0025] Figure 2 Software design flow chart. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the power state of the present invention can be detected by a power detection device. The main chip of the power detection device of the present invention adopts LPC2119, and the AD sampling chip adopts ADA4805 high-speed amplifier, which can meet the hardware requirements of the acquisition method of the present invention. The power signal detection range of the hardware circuit is 0-100mW, which can realize the power detection after the transmitter directional coupler is coupled and the detection of the reflected power of the receiver. The detection device reports the detected power value and state change by matching the CAN bus, which plays an early warning of state changes and abnormal prompts.

[0028] like Figure 2 As shown, a method for detecting a power state of the present invention comprises the following steps:

[0029] Step 1: Initial coupling value of each frequency point. Write the corresponding coupling value coefficient for different frequency points. The coupling value coefficient is determined according to different attenuator indicators. The attenuator indicator corresponds to the attenuation value of all frequency points. The attenuation value of all frequency points is calculated as the corresponding coupling value coefficient K. (If there are 61 operating frequency points of a certain band radar, K is K1-K 61 ) Write all coupling value coefficients to the software algorithm. Initialize the transmitter output power threshold (P fm) and the receiver reflected power threshold (P jm ), if the power value of a certain frequency point is detected to exceed the set threshold value, a signal is sent through the power detection device to shut down the radar excitation part, thereby protecting the radar to prevent the equipment from being burned due to excessive power or malfunctioning due to insufficient power. The sum threshold value of the coupling of each frequency point can be adjusted according to the CAN bus.

[0030] Step 2: Determine the degree of abnormality.

[0031] For a certain working frequency point, the power change abnormal level L X The calculation formula is:

[0032] L X The minimum is 1, for The last output power, L X Take an integer. The calculation method and formula for transmission and reception are the same in the present invention. The formula of the present invention is given by taking transmission as an example. The best level is specified as F, which is 16; F is the highest level alarm. It means that each power change exceeds 1600W. In this way, the power change state of each point can be judged, and even if it does not exceed the transmission and reception threshold value, an early warning can be issued immediately.

[0033] L1-L F (Parameter L x It can be customized as needed. The value range of X is hexadecimal 1-F) to indicate the degree of power state from small to large, with L F -L 01 (Example: 0F 01) indicates that the power state changes from high to low level, level L X It can be adjusted according to the frequency of the frequency switching when the radar is working. The default abnormality level is (01 05) and can be defined between 05-0F, so as to more clearly show the trend of the power value change of a certain frequency point. 11 and FF represent normal or fault status, and all data can be reported in hexadecimal data through the CAN bus.

[0034] For example, if the power of frequency point 01 is gradually decreasing and the status is normal, then 01 11 01 05PP is reported. This message means that at frequency point 1 (01), the transmitter output power status is normal (11), and is changing from small to large (01 05), and the actual output power value (PP).

[0035] For example, if the power of frequency point 01 gradually increases and the state is abnormal, 01FF 05 01P will be reported. This message means that the transmitter output power state of frequency point 1 (01) is faulty (FF), and is changing from large to small (05 01), and the actual output power value (P).

[0036] Step 3: Detect the actual output power value P of the transmitter 发射 and the actual receiver reflected power value P 接收 When the power detection device receives the operating frequency change information, it automatically switches to the corresponding frequency coupling value and performs actual power calculation, P 实 =K×X(where P 实 is the actual power value, K is the corresponding frequency coupling value coefficient, and X is the value detected by the power detection device). In order to ensure the accuracy of power detection, such as P 实发射2 =K2×X2, indicating the output power value P of the transmitter at frequency point 2 实发射2 The present invention continuously detects the power value of the frequency point N times to take the average value (the default detection number is 5 times), and the actual output power value is P = (P 实1 +…+P 实N ) / N, that is, the actual output power value of the present invention is P, which is the average value of multiple samplings within T time; when calculating the transmitter, it is the actual output power value of the transmitter P 发射 ; When calculating the receiver, it is the actual output power value of the transmitter P 接收 According to the changes of multiple actual output power values ​​at a certain frequency point within the time T, the power value change trend of the frequency point can be determined and queried and reported through the CAN bus.

[0037] Step 4: Determine the working frequency point change frequency for adaptive detection. According to the number of times T that different frequency points work within the third step T N For example, if the number of times the frequency is switched to No. 1 within time T is 10 times, it is represented as 01 0A and can be reported through the CAN bus. NAs the value gets bigger and bigger, it means that the device switches to the working frequency more frequently. Then the detection times N of the frequency point is adjusted (the initial number N is 5, which is adjusted through the CAN bus). The detection times of the frequency point are increased to accurately judge the changing trend of the frequency point, so as to judge whether the working status of the device is normal, so as to make a judgment in time.

[0038] The calculation formula for the number of transmission detection times N at each frequency point is as follows:

[0039]

[0040] in Round, such as T N-1 From 11 to 14 o'clock, Round to 1. Round, such as P 发射 When the power is between 100W and 199W, it is rounded to 1; T N-1 The number of times the frequency point worked in the previous cycle. The default value is 5 at startup.

[0041] The calculation formula for the number of reception detection times N at each frequency point is as follows:

[0042]

[0043] in Round, such as T N-1 From 11 to 14 o'clock, Round to 1. Round, such as P 接收 When the power is between 100W and 199W, it is rounded to 1; T N-1 The number of times the frequency point worked in the previous cycle. The default value is 5 at startup.

[0044] In this way, the number of times the radar switches to other working frequencies continues to be recorded when the radar is working. If it is detected that the number of switching times of other working frequencies increases, the detection times of the working frequency will be automatically switched to ensure that the power detection device performs effective power detection on the working frequency with a higher number of switching times. At the same time, it ensures that the amount of data collected at multiple frequencies is reasonable, effectively reducing the collection frequency.

[0045] Step 5: According to Step 2, Step 3 and Step 4, in the radar working process, if the power value change degree L of a certain frequency point is detected X Increase, the power value of the operating frequency may exceed the threshold value P fm or P jm , then the working frequency point is adaptively detected, and the N value calculated by the formula in step 4 is used. Within the time T, the number of detections of the frequency point increases by N. Similarly, within the time T, if the power value of the frequency point changes by L XThe detection method of the present invention is conducive to saving software computing resources, detecting the frequency point with large power value changes, and is conducive to quickly judging whether the working frequency point is working normally, and is also conducive to making a quick judgment response.

[0046] Step six: Adjust the coupling value coefficient in the power detection device. Different radar products operate in different frequency bands, which will lead to inconsistent coupler attenuation coefficients. The coupling value coefficient K needs to be adjusted according to the radar usage environment. For radar products of different bands, the initial coupling values ​​of each frequency point in step one can be changed through the CAN bus, so that the power detection device can be applied to different radar products. The switching frequency of the operating frequency points of radars for various purposes is different. The power detection number N in step three can be adjusted through the CAN bus, and the detection coefficient N can be increased or decreased to apply to radar products with different operating frequency conversion frequencies.

[0047] The present invention realizes status detection and judgment of radar transmitter output power value and receiver transmission power value through power detection device and power detection algorithm. Compared with the singleness of traditional radar transmitter output power detection and receiving node reflection power detection, the present invention can achieve status detection covering all working frequency points of radar and status detection and reporting of changing trend, which is beneficial to detecting the working status of radar products and making rapid response to abnormal status, so as to better utilize and protect radar products.

Claims

1. A method for detecting a power state, characterized in that: Step 1: Initial coupling values ​​at each frequency point; Step 2: Determine the degree of abnormality; For a certain working frequency point, the power change abnormal level L X The calculation formula is: L X The minimum is 1, P 发射n P 发射(n-1) The last output power, L X Take the integer; Step 3: Detect the actual output power value P of the transmitter 发射 and the actual receiver reflected power value P 接收 ; Step 4: Determine the working frequency point conversion frequency for adaptive detection and determine the number of detection times N; The calculation formula for the number of transmission detection times N at each frequency point is as follows: in Rounding, Round, such as P 发射 When the power is between 100W and 199W, it is rounded to 1. The calculation formula for the number of reception detection times N at each frequency point is as follows: in Round, such as T N-1 From 11 to 14 o'clock, Round to 1. Round, such as P 接收 When the power is between 100W and 199W, it is rounded to 1; T N-1 The number of times the frequency point worked in the previous cycle. The default value is 5 when starting. Step 5: According to the N value calculated by the formula in step 4, increase or decrease the number of detection times N for a specific frequency point, repeat steps 2 to 4, and perform cyclic detection.

2. A method for detecting a power state according to claim 1, characterized in that: In step 1, corresponding coupling value coefficients are written for different frequency points. The coupling value coefficients are determined according to different attenuator indicators. The attenuator indicators correspond to the attenuation values ​​of all frequency points. The attenuation values ​​of all frequency points are calculated as the corresponding coupling value coefficients K.

3. The method for detecting a power state according to claim 1, characterized in that: In step 2, L1-L F Indicates the degree of power state from small to large, with L F -L 01 Indicates the degree to which the power status changes from high to low.

4. The method for detecting a power state according to claim 1, characterized in that: In step 3, when the power detection device receives the operating frequency change information, it calculates the actual power, P 实 =K×X, the actual output power value is P=(P 实1 +…+P 实N ) / N; when calculating the transmitter, it is the actual output power value of the transmitter P 发射 ; When calculating the receiver, it is the actual output power value of the transmitter P 接收 .

5. The method for detecting a power state according to claim 1, characterized in that: The method also includes step six, adjusting the coupling value coefficient in the power detection device; and adjusting the coupling value coefficient K according to the frequency bands in which different radar products operate.

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