ASN-104 (D-4) unmanned aerial vehicle (Chinese Internet).
ASN-104型（D-4）无人机（中国英特网）

The ASN-104 (also known as D-4) tactical unmanned reconnaissance aerial vehicle (URAV) was developed by Xi'an ASN Technology Group Company, a commercial company of the Northwest Polytechnic University (NPU) in early 1980s. The ASN-105 is an improved variant introduced in the early 1990s. The ASN-104/105 was the first generation indigenous tactical URAV in service with the PLA, designed for battlefield reconnaissance, day/night surveillance, border patrol, artillery spotting, and aerial photography and prospecting roles.

ASN-104型（也即是D-4型）战术无人侦察机（URAV）由西安爱生技术集团公司发展，1980年早期西北理工大学（NPU）成立的一家商业公司。ASN-105型是一种在1990年早期推出的改进型。ASN-104/105型是在PLA服役的第一代国产战术无人侦察机（URAV），设计用于战场侦察、昼/夜监视、边境巡逻、火炮（落弹）观测、航空摄影和探矿任务。

Programme

NPU began to develop a lightweight tactical battlefield surveillance UAV in the early 1980s. The resulted D-4 (ASN-104) made its first flight in October 1983 and entered batch production in 1985. The D-4 was designed for military reconnaissance and civil aerial photographic survey. The onboard optical and night vision cameras can provide real-time TV images of the battlefield within 60km range. The ASN-105 was developed in the mid-1980s based on the ASN-104, but with an extended range of 100km and an improved ground control system.

计划

NPU在1980年早期开始发展一种轻型战术战场监视UAV。D-4（ASN-104型）在1983年10月作了它的首次飞行并在1985年进入了批量制造。D-4被设计用于军事侦察和民用航空照相测量。机载光学和夜视摄像机能在60公里范围内提供战场实时电视图像。ASN-105型基于ASN-104型在1980年中期发展，但是具有100公里的更大范围和一套改良地面控制系统。

Design

The ASN-104 has high-mounted wings, slightly tapered from roots to tips. The ASN-105’s wings are high-mounted, straight to the midsection, and tapered from mid-wing to tips. The engine is a single, prop-driven engine in the nose section. The fuselage is round and tapers to front and rear, with fixed landing pads. The tail flats are high-mounted on the body and equally tapered. The fin is equally tapered.

设计

ASN-104型采用高翼位，从翼根到翼尖轻微渐缩。ASN-105型高翼位，从翼根笔直到中部并从中部到翼尖渐缩。单发动机，螺旋桨驱动发动机在机头部位。圆形机身和从头到尾渐细，采用固定登陆橇。高翼位尾平翼安装在机身上并呈梯形，尾直翼也呈梯形。

The ASN-104/105 is powered by a HS-510 four cylinder dual ignition air cooled piston engine with a power rating of 22kw. The engine uses ordinary automobile fuel.

ASN-104/105型动力由一台HS-510型四缸双活塞气冷活塞发动机提供具有22千瓦功率，发动机使用普通汽车燃料。

A complete UAV system comprises six UAVs and a ground control station. The ground control station consists of a command & control vehicle, a mobile control vehicle, a mobile photo processing vehicle, and a mobile television image processing vehicle. The UAV is launched by rocket boosters from a mobile launcher, and recovered by parachute. The UAV is fitted with an under-fuselage impact absorbing device to minimise the damage caused during recovering.

一套完整UAV系统包括六架UAV和一套地面控制站。地面控制站由一辆指挥&控制车、一辆机动控制车、一辆机动相片处理车和一辆机动电视图像处理车组成。UAV采用火箭助推器从一个机动发射架发射，并被降落伞回收。UAV安装使用一种机身下减震装置去把回收期间产生的损害减到最低。

The UAV is fitted with an aerial photographic camera and a television imaging system with night vision channel. The imagery intelligence can be transmitted to the ground station in real-time, or stored in data storage devices. In a typical mission, the photographic camera can cover an area of up to 1,700 square kilometres. The size of the photo is 18cm X 18cm. Later variants could carry night vision devices and CCD cameras.

UAV配备有一台航空照相机和一套电视图像系统。图像情报能被实时传送到地面站或储存在数据存储装置中。在一个典型任务中，照相机能覆盖1,700平方公里区域。相片大小18厘米X18厘米。稍后改型可以携带夜视型器件和CCD照相机。

Ground Station

The ground station of the ASN-104 includes the radio tracking system, radio remote-control system, radio positioning and television image processing equipment. Each control station has two crewmembers: a navigator/commander and a UAV controller. If necessary, the radio tracking and remote-controlling systems can be disintegrated from the command and control vehicle and become man-portable. The aerial photographic photos and television images are processed in the mobile photo processing vehicle (dark room) and the mobile television image processing vehicle respectively.