RU81014U1 - HIGH STABILITY RATE SENSOR - Google Patents

Abstract

The proposed utility model relates to the field of radio engineering and can find application in the development of mobile communications of HF and VHF bands, navigation and radar systems, as well as in the time storage service.

The technical result is an increase in long-term frequency stability, a decrease in the number of units used, a decrease in the weight and dimensions of a reference frequency sensor, a decrease in power consumption, a reduction in cost, an increase in reliability, which is achieved by introducing a rubidium generator, a light indication and control device, electronic programmable into the proposed utility model frequency corrector and power device.

Description

The proposed utility model relates to the field of radio engineering and may find application in the development of mobile HF and VHF bands, navigation and radar systems, as well as in the time storage service.

Sources of stable frequencies are known, developed on the basis of quantum discriminators, for example, “F3725 frequency standards” (2008 brochure, FSUE SKB of radio measuring equipment), small-sized rubidium frequency standard on a gas cell PFS - 2001, (“Radio measuring devices”, scientific and technical catalog, Moscow, 2000).

The disadvantages of these sources of stable frequencies are:

- relatively large dimensions and weight (more than 2 kg);

- a narrow range of operating temperatures (-30 ° С + + 50 ° С);

- high power consumption (more than 25 watts);

- low resistance to mechanical stress.

The closest in parameters to the proposed utility model is the "Reference frequency sensor", ITNYA 433769001, (Concern Constellation OJSC),), developed on the basis of the utility model, certificate No. 11940 "Source of highly stable reference frequency based on quantum discriminator".

Figure 1 shows the structural diagram of the prototype shown in its technical description with all the necessary blocks included in it, where it is indicated:

I (AK) - quartz oscillator;

2 (UMCH) - frequency multiplier;

3 (CD) - quantum discriminator;

4 (FVS) - shaper of output signals;

5 (SI) - light indication device;

6 (СП) - tunable synthesizer;

7 (IVE) - a source of secondary power supply;

8 (UE5) - control element;

9 (UAHR) - automatic frequency control device.

The prototype contains a series-connected quartz 1 oscillator (AK), a frequency multiplier 2 (UMCh), a quantum discriminator 3 (CD), a frequency automatic adjustment device 9 (UAFC), the first output of which is connected to the input of a quartz 1 oscillator (AK) - this is a self-tuning ring and the second output of the automatic frequency control device 9 (UAHF) is connected to the input of the light indication device 5 (SI); tunable synthesizer 6 (SP), the first output of which is connected to the second input of the automatic frequency control device 9 (UAHF), and the second output of tunable 6 synthesizer (SP) is connected to the second input of quantum discriminator 3 (CD); quartz oscillator 1 (AK) whose three outputs (second, third and fourth) are connected to the three inputs of the output signal shaper 4 (FVS), respectively, and the fourth output, in addition, is connected to the second input of the tunable synthesizer 6 (SP) ; shaper of output signals 4 (FVS) has three outputs; a control element 8 (UE5), the output of which is connected to the first input of the tunable synthesizer 6 (SP), a secondary power source having five outputs.

The prototype device works as follows.

Quartz oscillator 1 (AK) from three outputs of which signals of three stable frequencies are output to three inputs of output signal shaper 4 (FVS) from three outputs of which are generated “working” signals generated by frequency and number of consumers. From the first output of the oscillator 1 (AK), the signal is fed to the input of the frequency multiplier 2 (UMCh), from the output of which this frequency multiplied by n times is fed to the first input of quantum discriminator 3 (CD). From the fourth input of the oscillator 1 (AK), the signal also goes to the second input of tunable synthesizer 6 (SP), where the necessary frequency is synthesized and this frequency from the second output of tunable synthesis 6 (SP) is fed to the second input of quantum discriminator 3 (CD) . From the signals of two frequencies arriving at the first and second inputs of quantum discriminator 3 (CD), a signal is formed that enters the volume resonator of the quantum discriminator and is compared with the frequency of the spectral absorption line of the hyperfine transition (STP line) of rubidium atoms Rv ⁸⁷ located in the working gas cell of the quantum discriminator.

When the signal generated in the quantum discriminator (CD) deviates from the frequency of the STP line, a signal is generated at the output of the quantum discriminator, which is output 3 (CD) to the first input of the automatic frequency control device 9 (UAFC), (a synchronous detector located in the automatic frequency control device) ) A signal from the first output of tunable 6 synthesizer (SP) is fed to the second input of the UHF - (second input of the synchronous detector).

The synchronous detector of the UACF unit generates a DC error signal, which is fed to the input of the quartz oscillator and adjusts the frequency of the quartz oscillator to the frequency of the STP line in the automatic frequency control ring under consideration (AFC). For a more accurate installation, synthesized by the frequency unit 6 (SP), control element 8 (UE5) is used, the output of which is connected to the first input of the tunable 6 synthesizer (SP), which changes the control codes of the digital synthesizer (SP), (mechanical switch of digital codes).

From the second output of the automatic frequency control device 9 (UHF), the signal is fed to the input of the light indication circuit 5 (SI), which is a three-position analog device that displays the following modes using the LEDs: a) product failure; b) the readiness of the product for work; c) finding the product in the search mode of the PLL response time. Secondary power supply 7 (MVE) is powered by the object’s wiring system and consists of a filter, pulse converters and linear stabilizers and provides five stabilized voltages to power all devices and units included in the reference frequency sensor.

The disadvantages of the prototype are:

- a large amount of energy consumption;

- relatively large dimensions and weight;

- high cost due to the large number of individually configurable blocks included in it;

- long duration of readiness for work;

- a large number of tuning elements, the change of parameters of which during operation leads to an increase in frequency instability;

- reduced reliability.

To eliminate these drawbacks, a rubidium generator is introduced into the device containing the output signal shaper having three outputs, the second output of which is connected to the first input of the light indication and control device, the third output of the rubidium generator is connected to the input of an electronic programmable frequency corrector, the output of which is connected to the first the input of the rubidium generator, while the first output of the rubidium generator is connected to the first and second inputs of the shaper of the output signals with the second input oystva light indication and control, whose output is connected to the third input rubidium generator and a power source having three outputs.

Figure 2 shows the functional diagram of the proposed utility model, where indicated:

4 (FVS) - shaper of output signals;

10 - rubidium generator;

11 - power device;

12 - electronic programmable frequency corrector;

13 - light indication and control device.

In the product, the structural diagram of which is shown in FIG. 2, the following are introduced: a rubidium generator 10, which functionally replaces devices 1 (AK), 2 (UMCh), 3 (KD), 9 (UAPCH), 6 (SP) and new devices 11, 12 , 13 replacing 7 (IVE), 5 (SI) and 8 (UE5).

The proposed utility model contains a rubidium generator 10, the first output of which is connected to parallel connected first and second inputs of the output signal shaper 4 (FVS) and the second input of the light indication and control device 13, the output of which is connected to the third input 4 (FVS), which has three outputs , the second output of the rubidium generator 10 is connected to the first input of the light indication and control device 13, the third output of the rubidium generator 10 is connected to an electronic programmable frequency corrector 12, the output of which is connected nen with the input of the rubidium generator 10, and a power source 11 having three outputs.

The proposed utility model works as follows.

The main unit included in the proposed utility model is a small-sized high-tech device. It, as in the prototype, includes a quartz oscillator, a quantum discriminator, and a number of other devices that adjust the frequency of the quartz oscillator to the frequency of the hyperfine transition line of excited rubidium atoms located in the working gas cell of the quantum discriminator.

The rubidium generator 10 has one highly stable high-frequency output and signal outputs, allowing using other devices of the utility model to evaluate its performance and frequency offset relative to its nominal value.

On the shaper of the output signals, in addition to the output frequency of the rubidium generator 10, a control signal must be supplied

frequency. In the prototype, this signal was issued by the same crystal oscillator as the main frequency signal.

Since the rubidium generator 10 has one high-frequency output, the control signal is generated in the light indication and control device 13 from the high-frequency signal of the rubidium generator 10. The generated control signal from the output of the light indication and control device 13 is supplied to the third input of the output signal generator 4 ( FVS).

From the second output of the rubidium generator 10, a two-position signal is sent to the first input of the light indication and control device 13, informing about the frequency of the crystal oscillator 10 entering the PLL capture band (or the absence thereof). This signal with the help of a simple electronic device is converted into a light signal informing the operator about the failure of the product or its readiness.

When the output frequency of the rubidium generator 10 deviates from the nominal value, a code signal about the displacement of its frequency is supplied from its output “Output data”. This signal is fed from the third input of the rubidium generator 10 to the input of an electronic programmable frequency corrector 12 and, in accordance with the program recorded in its microprocessor, a command is generated to increase or decrease this frequency offset, which is fed to the first input of the rubidium generator 10 ("Input data" ) with a certain speed determined by the operator. Upon reaching the minimum permissible deviation of the frequency of the generator 10 from the nominal value, the offset code

frequency is written to the generator ROM and stored until the next frequency correction procedure.

Since the frequency corrector used in the utility model is programmable, the frequency correction can be carried out with a very small error specified by the program.

The power device 11 is a simplified version of the prototype power supply and includes a filter and two linear stabilizers. The device provides consumers with three stabilized voltage sources, operates from the wiring network of the serviced object and provides filtered and stabilized voltages to the device blocks included in the proposed utility model.

An electronic programmable frequency corrector 12 is an electronic device that includes a microcontroller that generates codes for controlling its frequency to a rubidium generator according to a specific program.

The light indication and control device 13 is a device in which a two-position light signal is generated according to the PLL state transmitted from the output of the rubidium generator. In addition, a highly stable frequency signal is generated in this device, which serves to control the frequency characteristics of the entire reference frequency sensor and transmitted to the input of the output signal shaper.

The implementation of the proposed utility model does not cause any difficulties, since the devices included in it and their technical solutions are well known, and the main unit, the rubidium generator, is supplied by industry.

Tests of a model of a highly stable reference frequency sensor developed using the proposed utility model showed:

- the weight and dimensions of the sensor decreased by 1.8 times;

- the power consumed by the sensor decreased by 40%;

- the time of readiness of the sensor for work was reduced by 2.5 times;

- the cost of the reference frequency sensor decreased by 1.5 times.

Claims (1)

A highly stable reference frequency sensor containing an output signal shaper having three outputs, characterized in that a rubidium generator is inserted into it, the second output of which is connected to the first input of the light indication and control device, the third output of the rubidium generator is connected to the input of an electronic programmable frequency corrector, output which is connected to the first input of the rubidium generator, while the first output of the rubidium generator is connected to the first and second inputs of the output driver and the second input of the light indication and control device, the output of which is connected to the third input of the rubidium generator, and a power source having three outputs.