Frequency modulation circuit used for satellite positioning receiver

The utility model discloses a frequency modulation circuit used for a satellite positioning receiver. The circuit comprises a battery, five capacitors, six resistors, a first triode, a second triode, a time-base integrated chip and a potentiometer. The first triode and the second triode form a current Miller circuit which can generate charging currents in a charging circuit, the magnitude of the currents is determined through the first resistor and the potentiometer, and an oscillator frequency is changed after a low-frequency modulation signal and bias currents are superposed. Compared with the prior art, the time-base integrated chip serves as a main core component, the circuit used for automatically modulating frequency is formed by means of functions of the time-base integrated chip, the peripheral capacitors, the resistors and the triodes, the frequency modulation circuit is applied to a modulation circuit of the satellite positioning receiver, frequency modulation can be carried out automatically on the satellite positioning receiver, frequency modulation precision is improved, use is convenient, and the frequency modulation circuit has application and popularization value.