The invention discloses a special pseudorandom sequence dither frequency control oscillator A variable current source network and a current source phase of the oscillator are connected with the oscillator after being connected in parallel, the oscillator is connected with a frequency dividing circuit, the frequency dividing circuit is sequentially connected with a random clock generator and a self-starting pseudorandom sequence generator, and then the self-starting pseudorandom sequence generator is connected with the variable current source network to constitute a closed circuit The invention is used for making the oscillator in a power source management chip realize frequency change on the basis of the change of frequency change interval time to dither according to a pseudorandom mode, simulate pseudorandom noise and avoid introducing a novel frequency component in the dither frequency modulation process of the conventional dither frequency oscillator, so that the electromagnetic radiation is greatly reduced, and the environment test need of a switch power source is met The special pseudorandom sequence dither frequency control oscillator is suitable for all PS (power source) series AC-DC (alternating current to direct current) isolated or non-isolated switch power source controllers

Special pseudorandom sequence dither frequency control oscillator

The invention belongs to a laser gyroscope technology, and relates to a method for preciously measuring the dynamic lock region of a laser gyroscope. The method comprises the following steps: successively changing the sensitive axis of the gyroscope and the northern inclination angle near an east +/-alpha0 angle in a small angle and interval manner by using the component of the rotational angular velocity of the earth of 0 in order to change the gyroscope sensitive input angular velocity, maintaining every inclination angle position for a period of time, recording the output pulse number of the gyroscope in the position, and drafting a curve of the output pulse number of the gyroscope and the input earth velocity component to accurately obtain the dynamic lock region of the gyroscope. The above test method can eliminate the artificial repeated adjustment of southerly angle of the table top of a rotary table, reduces the test difficulty, shortens the test period, improves the test efficiency by 3 times, and easily realizes the automatic program control measurement of the dynamic lock region.

Method for preciously measuring dynamic lock region of laser gyroscope

The present invention relates to a mechanically dithered ring laser gyro dither device based on DSP and FPGA. A dithering mechanism generates a dither signal, and first passes the dither signal through a voltage follower, and then performs RC filtering; the filtering results are sent to a frequency follower circuit and a fixed amplitude circuit; the signal output by the frequency stabilization circuit directly enters an I / O port of a DSP; the output signal by the fixed amplitude circuit passes through an A / D converter and is transmitted to a DSP; the DSP conducts internally amplitude modulation and frequency follow, and outputs PWM wave to an FPGA; the FPGA conducts a phase shift processing, and outputs the results to a power amplifier circuit; and the results finally enter the dithering mechanism. The device has simple structure, small size and high control accuracy.

Mechanically dithered ring laser gyro dither device based on DSP and FPGA

The invention provides an anti-interference method for a jitter control system of a mechanically dithered laser gyroscope, the method comprises the following steps: acquiring a jitter feedback signal,and performing inverse transformation according to transfer functions of a jitter mechanism, a sensor and an amplifying circuit in the jitter control system to obtain an input signal of the jitter mechanism; removing a driving signal in the input signal to obtain an interference signal, and superposing a reverse interference signal in a driving signal to eliminate the influence of the interference signal. According to the scheme, the problem that the precision of a laser gyroscope jitter control system is reduced when the laser gyroscope jitter control system is interfered is solved, the influence of the interference signal can be reduced, and the resonant frequency scanning accuracy and the jitter amplitude control precision are improved.

Anti-interference method for jitter control system of mechanically dithered laser gyroscope

The utility model belongs to circuits of mechanically dithered ring laser gyroscopes, in particular to a circuit capable of simultaneously sampling and simulating pseudorandom noise injection used for a mechanically dithered ring laser gyroscope. The circuit comprises a clock oscillator, a clock frequency divider, an M sequence generator, a synchronization signal rising edge detection circuit, a synchronization signal falling edge detection circuit, a rising edge spike pulse generating circuit, a falling edge spike pulse generating circuit, a full-period or half-period selection control circuit and a sampling hold circuit, wherein the full-period or half-period selection control circuit controls the on state of a nusoidal signal falling edge spike pulse generating circuit, and nusoidal signal rising edge synchronous sampling spike pulse signals and nusoidal signal falling edge synchronous sampling spike pulse signals are output after the XOR operation to obtain the synchronous sampling spike pulse signals, thereby realizing that the mechanically dithered signals can simulate the pseudorandom noise injection in a half-period simultaneous way, integrating the full-period synchronous noise injection, reducing the dynamic lock-in of the mechanically dithered ring laser gyroscope effectively, and improving the performance figures of the laser gyroscope.

Jintao Li

Papers

Circuit capable of simultaneously sampling and simulating pseudorandom noise injection used for mechanically dithered ring laser gyroscope