A method for automatic phase stabilization of a broadband radio frequency microwave channel

Abstract

The present invention relates to the field of microwaves, and in particular to a method for automatic phase stabilization of a broadband radio frequency microwave channel. The phase shift circuit of the present invention is composed of a controllable time delay device and a controllable phase shifter connected in series, and the front and rear positions of the controllable phase shifter and the controllable time delay device are interchangeable; the controllable time delay device is used to perform a certain amount of delay processing on the received broadband radio frequency microwave signal; the controllable phase shifter is used to perform a certain amount of phase shift processing on the received broadband radio frequency microwave signal; and the phase of the broadband radio frequency microwave channel with different temperature phase characteristics is automatically stabilized or compensated. This technology overcomes the limitation that the phase shifter cannot be used to quickly and automatically compensate the phase of the instantaneous broadband radio frequency microwave channel under different temperature phase characteristics, and can stabilize or automatically compensate the phase of the broadband radio frequency microwave channel with different temperature-phase characteristics.

Description

Technical Field

[0001] The invention discloses a phase automatic stabilization method for a broadband radio frequency microwave channel, and its application fields are communication products and radars. Background Art

[0002] In radar or communication systems, it is often hoped that the consistency of the channel phase can be kept stable and consistent for multi-channel RF microwave channels. However, due to the differences in components, microwave circuit boards and processing and assembly processes used in RF microwave circuit design, the phases between RF microwave channels are different, the phase changes of the channels are also different when the temperature changes, and the phase changes of different operating frequencies under the same temperature change are also different. The existing patent tests the temperature-phase characteristics of the channel through experiments, and writes the phase data of different temperatures and different frequencies into the memory. When the circuit is working, it reads the temperature value of the temperature sensor and receives the information of the operating frequency point, and then queries the corresponding phase value to control the phase shifter for phase shift compensation. The limitation of this method is that it is necessary to receive frequency information and then compensate, and the phase compensation speed is too slow. At this time, the compensation needs to first analyze the frequency information, then look up the table according to the frequency information, and then shift the phase, which generally takes hundreds of nanoseconds and cannot meet the needs of the channel instantaneous broadband signal operation. The present invention discloses a phase automatic stabilization method for a broadband RF microwave channel, which effectively solves the limitations of such methods. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention discloses a method for automatically stabilizing the phase of a broadband radio frequency microwave channel. The technical solution of the present invention includes a radio frequency microwave controllable delay device, a radio frequency microwave controllable phase shifter, a temperature detection unit and a digital control unit. The radio frequency microwave circuit is composed of a controllable delay device and a controllable phase shifter connected in series, and the front and rear positions of the controllable phase shifter and the controllable delay device are interchangeable. The present invention can perform phase stabilization or automatic compensation on broadband radio frequency microwave channels with different temperature-phase characteristics.

[0004] The technical solution of the present invention is: a method for automatic phase stabilization of a broadband radio frequency microwave channel, characterized in that: the specific steps are as follows:

[0005] Step 1: Test the frequency-phase characteristic data of the broadband RF microwave channel at different temperatures through temperature tests;

[0006] Step 2: Analyze the frequency-phase characteristic data of the broadband RF microwave channel at different temperatures; select the phase value at a certain temperature as the reference phase φ r , calculate the phase change difference Δφ of different frequencies of the channel at different temperatures;

[0007] Step 3: Calculate the channel phase change difference at each temperature With reference phase φ rThe difference is denoted as Δφ i , Δφ i is the phase difference at each temperature, and the delay t of the delay device at different temperatures is calculated i , i is a label;

[0008] Step 4: Calculate the phase shift value of each channel frequency after delay at different temperatures

[0009] Step 5: Set the phase shift value after the delay of the delay device at each temperature Subtract the reference phase φ r , calculate the phase shift value of the phase shifter

[0010] Step 6: Set the delay t of the channel at each temperature i and phase shift value Corresponding to the temperature, it is written into the memory of the digital control unit;

[0011] Step 7: When the circuit is working, the digital control unit searches the memory of the control unit for the delay value t corresponding to the current temperature according to the temperature value detected by the temperature detection unit. i and phase shift value

[0012] The method of the present invention has the beneficial effect that: since the circuit characteristics are compensated by hardware, no external input frequency information is required for processing, so the phase stability of the instantaneous broadband signal of the radio frequency microwave channel can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Principle block diagram of the phase automatic stabilization device for broadband RF microwave channels. DETAILED DESCRIPTION

[0014] The present invention is further described below with reference to the accompanying drawings and implementation examples.

[0015] like Figure 1 The phase compensation circuit of the present invention includes a broadband RF microwave controllable delay device, a controllable phase shifter, a digital control unit and a temperature detection unit. The digital control unit collects the temperature output by the temperature detection unit, calculates and stores the delay amount and the phase shift value, and controls the controllable delay device to delay and the controllable phase shifter to shift the phase according to the collected values.

[0016] The controllable delay device is used to delay the received broadband RF microwave signal by a certain amount. The frequency-phase characteristics of the broadband RF microwave channel are compensated by the controllable delay device to ensure the consistency of the frequency-phase characteristics of the broadband RF microwave channel. The characteristic of the delay device is to delay signals of different frequencies, and the delays of signals of different frequencies are the same. The phase change value of each frequency signal after the signal delay is:

[0017]

[0018] (1) Where: is the phase value, the unit is degree (°), f is the signal frequency, the unit is gigahertz (GHz, 1GHz = 10 9 Hz), t is the delay, the unit is nanosecond (ns, 1ns = 10 -9 s).

[0019] Under the same delay, the phase changes of different frequencies in the channel are different. The difference in phase changes of different frequencies under the same delay condition is:

[0020]

[0021] (2) Where: Δφ is the phase change difference of different frequencies under the same delay, in degrees (°); Δf is the difference between different frequency values, in gigahertz (GHz); and t is the delay.

[0022] The controllable phase shifter is used to perform a certain amount of phase shift processing on the received broadband RF microwave signal. The phase of the broadband RF microwave channel is adjusted by the controllable phase shifter to ensure the stable and consistent phase of the broadband RF microwave channel. The characteristic of the phase shifter is that when the phase of different frequency signals is shifted, the phase change of each frequency signal is the same.

[0023] The circuit realizes automatic stabilization of the phase of any broadband RF microwave channel with different temperature phase characteristics. This technology overcomes the limitation that the phase shifter cannot automatically compensate the phase of the broadband RF microwave channel with different temperature phase characteristics instantaneously, and realizes phase stabilization or automatic compensation of broadband RF microwave channels with different frequency-phase characteristics at different temperatures.

[0024] Figure 1 This is a block diagram of the circuit principle of the present invention, in which an input signal is output after passing through a controllable delay device and a controllable phase shifter.

[0025] The present invention is further described below by taking a broadband radio frequency channel with an operating frequency of 1.2 GHz to 1.4 GHz as an example. Figure 1 Carry out scheme design.

[0026] Step 1: First, the temperature-frequency-phase data of the broadband RF microwave channel obtained by experimental testing is shown in Table 1.

[0027] Table 1. Temperature-frequency-phase data of broadband RF microwave channel

[0028]

[0029]

[0030] Step 2: Analyze the frequency-phase characteristic data of the broadband RF microwave channel at different temperatures. Select the phase value at a certain temperature as the reference phase φ r , and calculate the phase change difference Δφ of the broadband RF microwave channel at different temperatures.

[0031] According to Table 1, assuming that the phase value of 50°C is selected as the reference value, the phase difference Δφ of different frequencies of the channel at different temperatures from 1.2 GHz to 1.4 GHz is calculated.

[0032] Table 2 Phase difference of different frequencies of channels at different temperatures

[0033]

[0034] Step 3: Calculate the channel phase change difference Δφ at each temperature and the reference phase φ at the reference temperature r The difference is denoted as Δφ i The delay time of the delay device at different temperatures can be calculated by formula (2): i , i is a label, such as 10° is recorded as 20° is recorded as

[0035] Table 3 Delay values ​​at different temperatures

[0036] temperature <![CDATA[Difference Δφ from the reference phase i > <![CDATA[Delay amount t of the delay device i > Remark 10℃ 39° 0.542ns 20℃ 29° 0.403ns 30℃ 17° 0.236ns 40℃ 10° 0.139ns 50℃ 0° 0 49°

[0037] Step 4: Calculate the phase shift value of each channel frequency after delay at different temperatures using formula (1)

[0038] Table 4 Channel phase after delay at different temperatures

[0039]

[0040] Step 5: Subtract the reference phase φ from the channel phase value after the delay at each temperature r , calculate the phase shift value of the phase shifter i is a label, such as 10° is recorded as 20° is recorded as

[0041] Table 5 Phase shift values ​​at different temperatures

[0042]

[0043] The phase shift value at different temperatures is the average of the phase shift values ​​of each frequency point at the current temperature. The phase values ​​of each frequency point at different temperatures after delay and phase shift are shown in Table 6.

[0044]

[0045] Step 6: Set the delay t of the channel at each temperature i and phase shift value Corresponding to the temperature, it is written into the memory of the digital control unit.

[0046] Step 7: When the circuit is working, the digital control unit searches the memory of the control unit for the delay value t corresponding to the current temperature according to the temperature value detected by the temperature detection unit. i and phase shift value The controllable delay device is controlled to delay and the controllable phase shifter is controlled to shift the phase, thereby achieving phase stability of the broadband radio frequency microwave channel.

[0047] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art can implement the present invention in various other specific implementation modes based on the contents disclosed in the present invention. Therefore, any design that adopts the design structure and concept of the present invention and makes some simple changes or modifications shall fall within the scope of protection of the present invention.

Claims

1. A method for automatic phase stabilization of a broadband radio frequency microwave channel, characterized in that: The specific steps are as follows: Step 1: Test the frequency-phase characteristic data of the broadband RF microwave channel at different temperatures through temperature tests; Step 2: Analyze the frequency-phase characteristic data of the broadband RF microwave channel at different temperatures; select the phase value at a certain temperature as the reference phase φ r , calculate the phase change difference Δφ of different frequencies of the channel at different temperatures; Step 3: Calculate the channel phase change difference at each temperature With reference phase φ r The difference is denoted as Δφ i , Δφ i is the phase difference at each temperature, and the delay t of the delay device at different temperatures is calculated i , i is a label; Step 4: Calculate the phase shift value of each channel frequency after delay at different temperatures Step 5: Set the phase shift value after the delay of the delay device at each temperature Subtract the reference phase φ r , calculate the phase shift value of the phase shifter Step 6: Set the delay t of the channel at each temperature i and phase shift value Corresponding to the temperature, it is written into the memory of the digital control unit; Step 7: When the circuit is working, the digital control unit searches the memory of the control unit for the delay value t corresponding to the current temperature according to the temperature value detected by the temperature detection unit. i and phase shift value 2. The method for automatic phase stabilization of a broadband radio frequency microwave channel according to claim 1, characterized in that: The delay value t in step 3 i The calculation formula is: Where Δφ is the phase change difference of different frequencies under the same delay, and Δf is the difference between different frequency values.

3. The method for automatic phase stabilization of a broadband radio frequency microwave channel according to claim 1, characterized in that: Phase shift value φ in step 4 i The calculation formula is: Where f is the frequency, t i The delay amount.

4. The method for automatic phase stabilization of a broadband radio frequency microwave channel according to claim 1, characterized in that: In step 5, the phase shift values ​​at different temperatures are taken as the average value of the phase shift values ​​of each frequency point at the current temperature.

5. The method for automatic phase stabilization of a broadband radio frequency microwave channel according to claim 1, characterized in that: It also includes a phase compensation circuit, which includes a broadband RF microwave controllable delay device, a controllable phase shifter, a digital control unit and a temperature detection unit. The digital control unit collects the temperature output by the temperature detection unit, calculates and stores the delay amount and the phase shift value, and controls the controllable delay device to delay and the controllable phase shifter to shift the phase according to the collected values.

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