Mars Camera In-Depth Dossier: Tianwen-1 and Zhurong

The Hong Kong Polytechnic University (PolyU) Comprehensive Information Database · 04 Research Module
This dossier focuses on the “Mars Landing Surveillance Camera” developed at PolyU — it was carried aloft by the nation’s first Mars mission, Tianwen-1 (2021), to photograph the lander’s surroundings and monitor the status of the Zhurong rover on the Martian surface. It marks another milestone for PolyU’s space research, beyond the Moon.
For the lunar sampling system, see lunar-sampling-system.md; for the RCDSE institutional profile, see deep-space-exploration-research-centre.md; for an aerospace overview, see aerospace-and-space.md. Material is drawn chiefly from PolyU press releases, PolyU publications, and authoritative media; all sources are cited.

# 1. At a Glance

# 2. What the Mars Camera Does

The Mars Camera’s job is to serve as an “eye” in the remote and harsh Martian environment. According to a PolyU press release^※ and a multidisciplinary‑research press release^※, its core functions include:

• Photographing the lander’s surroundings: supplying visual information for surface activities on Mars;
• Monitoring the status of the Zhurong rover: providing status surveillance during rover deployment and driving;
• Early documents also connect the Mars Camera to identifying potential landing sites (drawing on terrain‑mapping and landform‑analysis techniques).

Mars is extremely far from Earth, with significant communication delays; the environment — temperature, radiation, dust storms — is exceptionally harsh. The camera must operate reliably under these conditions. This imposes extremely high demands on the instrument’s reliability, environmental resilience, and space‑qualification verification. From atmospheric entry to a successful landing, a Mars probe must complete the entire sequence autonomously; the ground team cannot intervene in real time because the one‑way Earth–Mars communication delay can exceed ten minutes, and the round‑trip time for any command far outstrips the few‑minute window of the landing itself. For the Mars Camera, this meant not only “taking clear pictures” but also “withstanding the landing impact” in that instant, and automatically recording the critical image data for later analysis without any human intervention.

According to a PolyU press release^※, the Mars Camera specifications are:

What does 6,200G mean in practice? 1G equals the acceleration due to gravity at the Earth’s surface (about 9.8 m/s²). A landing shock of around 6,200G means the instrument must withstand an instantaneous acceleration of roughly 60,760 m/s² — a force equivalent to about 6,200 times its own weight. This is why space instruments must undergo rigorous “space‑qualification experiments” (including vibration testing and thermal‑vacuum testing) before they can fly. The PolyU team designed an anti‑shock structure specifically for the Mars Camera, enabling it to image normally even after the landing impact.

Source strength: Mars Camera functions (photographing surroundings, monitoring Zhurong) and mass / field‑of‑view / temperature‑differential / shock specifications are all found in PolyU press releases.

# 3. Tianwen-1 (2021): the Nation’s First Mars Mission

According to PolyU material and public reports, Tianwen-1 was China’s first independent Mars exploration mission. It launched in 2020, landed in 2021, and deployed the Zhurong rover. It was a landmark step in China’s move from lunar to Martian deep‑space exploration.

The Mars Camera developed by PolyU flew aboard Tianwen-1, photographing the environment and monitoring Zhurong on the Martian surface — making PolyU the Hong Kong participant in this first‑ever national Mars mission. According to PolyU publications, the scholar who led the effort is the first Hong Kong scientist to have participated in developing instruments for a national space mission (see aerospace-and-space.md).

Source strength: Tianwen-1 as the nation’s first Mars mission and the Mars Camera’s participation appear in PolyU press releases.

# 4. Development Speed: the Sub‑Three‑Year Sprint

According to PolyU’s records, the team completed the Mars Camera — along with the corresponding space‑qualification verification experiments — in under three years.

This pace is no small feat in space engineering: from design to passing space‑qualification tests (proving that the instrument can operate reliably under launch vibration, vacuum, extreme temperatures, radiation, etc.) normally requires lengthy, repeated testing. That the PolyU team completed the entire workflow in under three years reflects its mature capabilities in precision engineering and space‑qualification verification — a speed built squarely on the experience accumulated by Professor Yung’s team from earlier work on camera‑pointing systems (for Chang’e‑3 and ‑4) and regolith‑sampling and encapsulation systems (for Chang’e‑5 and ‑6; see lunar-sampling-system.md).

Source strength: Under‑three‑year completion of development and space‑qualification verification is found in PolyU material.

# 5. Aftermath: Exhibition at the National Security Education Gallery

The Mars Camera’s significance goes beyond scientific research. According to PolyU PAIR news^※, the PolyU‑developed Mars Camera was exhibited at the National Security Education Exhibition Gallery — presented as an example of Hong Kong’s technological strength serving national space endeavours, woven into the narrative of national security and self‑reliance in science and technology.

This exhibition elevated the Mars Camera from a “research instrument” to a symbol of Hong Kong’s participation in the nation’s technology strategy, giving it a public significance beyond its technical merits. The gallery is typically open to the public and student groups, and the Mars Camera sits beside an explanatory panel reading “Developed by The Hong Kong Polytechnic University,” letting visitors directly connect “Hong Kong research” with “national space projects.” This style of display is itself a public‑communication strategy, translating the laboratory’s technical details into a national narrative that ordinary citizens can grasp.

Source strength: The Mars Camera’s exhibition at the National Security Education Exhibition Gallery comes from PolyU PAIR news; the exhibition‑hall characterisation and communication significance are analytical summaries.

# 6. Placing the Mars Camera in PolyU’s Space‑Research Landscape

The Mars Camera and the lunar sampling system together form the “twin stars” of PolyU’s space research:

From the Moon to Mars, from “sampling” to “monitoring,” PolyU’s space‑instrument contributions span several key milestones of national deep‑space exploration. This body of work cements PolyU’s role as “Hong Kong’s partner in national deep‑space exploration” (for an overview, see aerospace-and-space.md).

The Mars Camera’s success also gave PolyU a “dual‑strand contribution” to the Tianwen‑1 mission: Professor Yung’s team provided the camera that watched over the landing, while Professor Wu Bo’s team handled the terrain‑mapping analysis for landing‑site selection (detailed in wu-bo-lunar-mars-topographic-mapping.md). These two technical streams — “building the camera” and “reading the terrain” — collaborated within the same mission, a concrete expression of the “institution + two directors” organisational model of PolyU’s Research Centre for Deep Space Explorations (RCDSE) (see deep-space-exploration-research-centre.md).

Although the Mars Camera and the camera‑pointing system both have “camera” in their names, their functional roles are completely different: the camera‑pointing system is a rotatable “eye” used to capture panoramic lunar views and build 3‑D terrain models; the Mars Camera is a fixed “monitor” mounted on the top exterior of the landing platform, dedicated to recording the crucial images of the landing moment and rover deployment status. What the two share is that both had to pass stringent space‑qualification verification and both were designed under Professor Yung’s leadership — which is why this database groups them as “representative works” of PolyU’s space instruments rather than isolated cases.