HJMAG803A high-temperature three-axis high-precision weak magnetic measurement module mounted on the satellite

On October 14, 2021, at 18:51, two small satellites made in Shenzhen—the commercial meteorological detection constellation experimental satellite and the orbital atmospheric density detection experimental satellite—were successfully launched by the Long March 2D rocket from the Taiyuan Satellite Launch Center. Based on thorough testing and evaluation in the early stages, the company carried our HJMAG803A high-temperature three-axis weak magnetic measurement module. This not only deepens the confidence of further cooperation between the two units but also demonstrates that the years of hard work by Hangjing people have been tested in practical applications. We will continue to uphold the spirit of craftsmanship, persistently improve product quality consistency and reliability, achieve our ideal of serving the country through microelectronics with high-performance products and services, and continuously exceed customer expectations.

Figure 1 Satellite physical diagram

FigureFigure 2 On-site assembly diagram

HJMAG803A is a high-temperature three-axis high-precision weak magnetic measurement module. The circuit consists of an oscillation source, acceleration network, driving network, voltage doubling network, amplification network, synchronous demodulation network, integration network, feedback network, bias circuit, and temperature measurement circuit. It uses a magnetoresistive sensor circuit method to measure the geomagnetic field of the surrounding environment, achieving mutual conversion between geomagnetic signals and voltage signals. The module can operate at temperatures up to 175°C.

FigureFigure 3 Principle block diagram

FigureFigure 4 Product physical object

FigureFigure 5 Module packaging form

This weak magnetic measurement module is mainly used to measure the angle between the satellite and Earth's magnetic field ((Ox, Oy, Oz), providing a basis for adjusting satellite attitude. Compared to traditional fluxgate sensors, it has advantages such as low energy consumption, high reliability, good stability, and small size; simulating PID loop applications results in minimal secondary nonlinearity and drift over time. This series of weak magnetic measurement modules is widely used in fields such as Measurement While Drilling (MWD), gamma measurements, pitch angle measurements, navigation attitude determination, and non-reference rotational speed measurements. Several independently developed high-precision weak magnetic measurement modules have served various fields including oil exploration and satellites. The series includes: HJMAG803, HJMAG804, HJMAG805A.