Fig.1

A typical airborne towed detection coil array system

Fig.2

Schematic diagram of towed detection coil array system structure

Fig.3

Schematic diagram of system dynamic modeling flowchart

Fig.4

Schematic diagram of mass-spring-damper model

Fig.5

Coil body coordinate system and inertial coordinate system

Fig.6

Process of system structural design

Fig.7

Force analysis of cable static modeling

Fig.8

Comparison of flexible static model and simplified rigid-rod model of cable

Fig.9

Comparison of system steady-state configurations at varying airspeeds （altitude： 2 km）

Fig.10

Three-dimensional steady-state configuration of system at 110 km/h airspeed （altitude： 2 km）

Fig.11

Flight verification of system

Fig.12

Measured pitch angle time-series data during steady-state flight

Table 1

Comparison of working lengths and back-calculated unstretched lengths for emittercoil suspension cables

Table 2

Physical and geometric parameters of coils

Table 3

Physical and geometric parameters of cables

Table 4

Aerodynamic parameters of coils

Fig.13

Comparison of acceleration profiles for five smooth acceleration strategies

Fig.14

Effect of different acceleration strategies on emitter coil’s pitch angle

Fig.15

Effect of different acceleration strategies on tension at main cable apex

Fig.16

Effect of different acceleration strategies on total aerodynamic force of system

Fig.17

Effect of different membrane coverage rates on angle emitter coil’s pitch angle

Fig.18

Effect of different membrane coverage rates on tension at main cable apex

Fig.19

Effect of crosswind speed on emitter coil’s roll angle （direct crosswind）

Fig.20

Effect of crosswind direction on emitter coil’s roll angle （15 m/s）

Fig.21

Effect of turning angular velocity on coil’s center of mass

Fig.22

Effect of turning angular velocity on maximum offset distances of inner and outer envelopes

Fig.23

Effect of turning angular velocity on emitter coil’s pitch angle

Fig.24

Effect of turning angular velocity on emitter coil’s side slip angle

Fig.25

Effect of turning angular velocity on emitter coil’s roll angle

Fig.26

Effect of turning angular velocity on tension at main cable apex