LM-30 UAV system Introduction

LM-30 UAV system includes flight platform, command and control system, launching system and integrated support system. The flight system comprises a LM30 platform, an airborne datalink end and a gimbal camera.etc, the command and control system include a ground control station and a ground datalink; the launching system include a launcher device, a launching ignition system and a booster; The integrated support system includes packaging equipment and operation and maintenance equipment.

Figure3 UAV system composition architecture

1. Battery

The UAV is equipped with two rechargeable lithium-ion batteries as the energy source of the whole aircraft.

Table3    Parameters of lithium ion battery

2. Power system

The UAV power system consists of a motor with a maximum power of 7.5KW, an electric regulator with a maximum continuous working current of 120 A (good heat dissipation) and a two-blade propeller with a size of 23 inches. The performance parameters of the power system are shown in the table below.

Table4    Parameters of power system

The power distribution system is composed of relay box, distribution box and cable assembly to complete the functions of UAV power access, secondary power conversion and power transmission. The relay box has the functions of power supply access, pre-charging and power-on, power-on self- locking and power-off. The distribution box has the function of secondary power supply conversion. The cable transmits the electric energy to each electrical equipment, as shown in the following figure.

The belly has a pull-out breakaway connector with the following functions:
a. Charge and discharge the battery on the machine;
b. Ground power access;
c. Maintenance interface of flight control computer (network port and mode switching interface);
d. Upper and lower electrical interfaces of UAV;
e. Rocket launch interlock interface.

Figure4    Power distribution system diagram

Airborne datalink is a bidirectional data link for UAV applications, which can transmit video data and measurement and control data at the same time. The airborne datalink uses a single antenna time-sharing multiplexing mode, which greatly reduces the total weight of the equipment, has simple connection, is convenient to install and integrate, and can be quickly deployed for work; Intelligent design is adopted to adjust the working frequency point, bandwidth and output power on site.

Table5 Airborne datalink parameter

Figure5 Airborne Datalink

The gimbal camera adopts a two-axis stabilized platform, installs a conductive slip ring to achieve 360 ° continuous rotation, and is equipped with a 30x high-definition visible light camera, a long-wave uncooled infrared imaging component, and a laser rangefinder. It is mainly used for ground imaging detection, identification, tracking, ranging and positioning, and meets the needs of aerial mapping, monitoring, survey, etc. Its important functional performance indicators are as follows.

A.Visible zoom camera
i.Working waveband: 0.4 μm ~ 0.9 μm;
ii.Resolution: 1920 × 1080;
iii.Focal length: 4.3mm ~ 129mm, optical 30x continuous zoom, 12x digital zoom;
iv.Optical zoom hFOV 63.7º ~ 2.3º;
v.Video output: Ethernet, 1080P, 30 Hz;

B.Uncooled LWIR
i.Operating band: 8 μm ~ 14 μm;
ii.Detector pixel number: 640 × 512;
iii.Pixel size: 12 um;
iv.NETD：50mk；
v.Focal length: 35mm/F1.0;
vi.Field angle: 12.5º × 10º;
vii.Video output: Ethernet, 1080P, 30 Hz.

C.Laser Rangefinder
i.Working wavelength: 1535nm;
ii.Ranging accuracy: ± 1 m;
iii.Ranging frequency: 5Hz;
iv.Laser ranging distance: 50-3000m

D.Servo System
i.Swing range
Azimuth axis: n × 360 ° continuous rotation
Pitch axis: -110 ° ~ + 10 ° (horizontal direction is 0 °, upward is positive)
ii.Angle measurement accuracy: ≤ 2mrad;
iii.Stabilization accuracy: ≤ 100µrad (1σ) (2 °/1Hz, 1 °/2Hz swing);
iv.Maximum angular velocity: ≥ 50 °/s;
v.Maximum angular acceleration: ≥ 90 °/s 2 .

E.Tracking Functions
i.Pixel deviation update rate: 50hz;
ii.Tracking speed: 30 pixels/frame;
iii.Minimum target contrast: 8%;
iv.Minimum target imaging size: 4 × 3 pixels;
v.In the case of rolling, rapid reduction or enlargement of target imaging, it has the ability of tracking without slippage and loss.
It has the ability to automatically recapture the target after the short-term occlusion of clouds and ground scenes is eliminated.

The ground datalink adopts a light PTZ, and the ground processing equipment is integrated inside the turntable, which is a completely integrated design. Appearance and dimensions of the ground datalink are shown in the figure below:

Table6 Ground Datalink Parameters

Figure8  Ground Datalink